"""
AzA Intern – separates internes Webportal (Phase 1).
Nicht Teil des produktiven AzA-Hauptsystems.
"""

from __future__ import annotations

import os
import re
import secrets
import sqlite3
import uuid
import html as html_module
from html.parser import HTMLParser
from contextlib import contextmanager
from datetime import date, datetime
from pathlib import Path
from typing import Any, Generator, Optional

from fastapi import Depends, FastAPI, File, Form, HTTPException, Request, UploadFile
from fastapi.responses import FileResponse, HTMLResponse, JSONResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from passlib.context import CryptContext
from starlette.middleware.sessions import SessionMiddleware

BASE_DIR = Path(__file__).resolve().parent
DB_PATH = Path(os.environ.get("AZA_INTERN_DB_PATH", str(BASE_DIR / "intern.db")))
UPLOAD_DIR = Path(os.environ.get("AZA_INTERN_UPLOAD_DIR", str(BASE_DIR / "uploads")))
BACKUP_DIR = Path(os.environ.get("AZA_INTERN_BACKUP_DIR", str(BASE_DIR / "backups")))
TEMPLATES_DIR = BASE_DIR / "templates"
STATIC_DIR = BASE_DIR / "static"

MAX_UPLOAD_BYTES = 200 * 1024 * 1024
MAX_UPLOAD_MB = 200

ALLOWED_EXTENSIONS = frozenset({
    ".pdf", ".png", ".jpg", ".jpeg", ".webp", ".gif", ".svg",
    ".doc", ".docx", ".odt", ".rtf",
    ".xls", ".xlsx", ".ods", ".csv",
    ".ppt", ".pptx", ".odp",
    ".txt", ".md",
    ".zip", ".7z", ".rar",
    ".eml", ".msg",
    ".xml", ".json",
})

BLOCKED_EXTENSIONS = frozenset({
    ".exe", ".bat", ".cmd", ".ps1", ".sh", ".msi", ".dll",
    ".js", ".vbs", ".scr", ".jar", ".app", ".dmg",
})

UPLOAD_HINT_LINE1 = "Max. 200 MB pro Datei"
UPLOAD_HINT_LINE2 = "Bürodateien, PDFs, Bilder, Tabellen, Präsentationen, Archive und E-Mails erlaubt"
UPLOAD_HINT_LINE3 = "Keine Patientendaten, API-Keys, Passwörter oder Secrets hochladen"

TASK_STATUSES = ["Neu", "In Arbeit", "Warten auf André", "Erledigt", "Archiv"]
TASK_PRIORITIES = ["niedrig", "normal", "hoch"]
CATEGORIES = [
    "Recherche", "Webseite", "Flyer / Marketing", "Screenshots / Bugs",
    "Anleitung", "Recht / Datenschutz", "Installer / Release", "Sonstiges",
]
ROLES = ["admin", "assistant"]

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

app = FastAPI(title="AzA Intern", docs_url=None, redoc_url=None)
session_secret = os.environ.get("AZA_INTERN_SESSION_SECRET") or secrets.token_hex(32)
app.add_middleware(SessionMiddleware, secret_key=session_secret, https_only=False, same_site="lax")

templates = Jinja2Templates(directory=str(TEMPLATES_DIR))
app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")

UPLOAD_DIR.mkdir(parents=True, exist_ok=True)
BACKUP_DIR.mkdir(parents=True, exist_ok=True)


def now_iso() -> str:
    return datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S")


@contextmanager
def get_db() -> Generator[sqlite3.Connection, None, None]:
    conn = sqlite3.connect(str(DB_PATH))
    conn.row_factory = sqlite3.Row
    conn.execute("PRAGMA foreign_keys = ON")
    try:
        yield conn
        conn.commit()
    except Exception:
        conn.rollback()
        raise
    finally:
        conn.close()


def init_db() -> None:
    with get_db() as conn:
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS users (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                username TEXT NOT NULL UNIQUE,
                password_hash TEXT NOT NULL,
                display_name TEXT,
                role TEXT NOT NULL DEFAULT 'assistant',
                is_active INTEGER NOT NULL DEFAULT 1,
                deleted_at TEXT,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL
            );
            CREATE TABLE IF NOT EXISTS tasks (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                title TEXT NOT NULL,
                description TEXT,
                status TEXT NOT NULL DEFAULT 'Neu',
                priority TEXT NOT NULL DEFAULT 'normal',
                category TEXT,
                assigned_to INTEGER,
                due_date TEXT,
                created_by INTEGER NOT NULL,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL,
                FOREIGN KEY (assigned_to) REFERENCES users(id),
                FOREIGN KEY (created_by) REFERENCES users(id)
            );
            CREATE TABLE IF NOT EXISTS task_comments (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                task_id INTEGER NOT NULL,
                user_id INTEGER NOT NULL,
                comment TEXT NOT NULL,
                created_at TEXT NOT NULL,
                FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
                FOREIGN KEY (user_id) REFERENCES users(id)
            );
            CREATE TABLE IF NOT EXISTS files (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                original_filename TEXT NOT NULL,
                stored_filename TEXT NOT NULL UNIQUE,
                content_type TEXT,
                size_bytes INTEGER NOT NULL,
                category TEXT,
                description TEXT,
                task_id INTEGER,
                uploaded_by INTEGER NOT NULL,
                created_at TEXT NOT NULL,
                FOREIGN KEY (uploaded_by) REFERENCES users(id),
                FOREIGN KEY (task_id) REFERENCES tasks(id)
            );
            CREATE TABLE IF NOT EXISTS notes (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                title TEXT NOT NULL,
                body TEXT,
                category TEXT,
                created_by INTEGER NOT NULL,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL,
                FOREIGN KEY (created_by) REFERENCES users(id)
            );
            CREATE TABLE IF NOT EXISTS tags (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                name TEXT NOT NULL UNIQUE
            );
            CREATE TABLE IF NOT EXISTS item_tags (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                tag_id INTEGER NOT NULL,
                item_type TEXT NOT NULL,
                item_id INTEGER NOT NULL,
                FOREIGN KEY (tag_id) REFERENCES tags(id) ON DELETE CASCADE,
                UNIQUE(tag_id, item_type, item_id)
            );
            CREATE TABLE IF NOT EXISTS documents (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                title TEXT NOT NULL,
                content_html TEXT DEFAULT '',
                category TEXT,
                task_id INTEGER,
                created_by INTEGER NOT NULL,
                updated_by INTEGER,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL,
                deleted_at TEXT,
                FOREIGN KEY (task_id) REFERENCES tasks(id),
                FOREIGN KEY (created_by) REFERENCES users(id),
                FOREIGN KEY (updated_by) REFERENCES users(id)
            );
        """)


def migrate_db() -> None:
    with get_db() as conn:
        file_cols = {row[1] for row in conn.execute("PRAGMA table_info(files)").fetchall()}
        if "task_id" not in file_cols:
            conn.execute("ALTER TABLE files ADD COLUMN task_id INTEGER REFERENCES tasks(id)")
        user_cols = {row[1] for row in conn.execute("PRAGMA table_info(users)").fetchall()}
        if "display_name" not in user_cols:
            conn.execute("ALTER TABLE users ADD COLUMN display_name TEXT")
        if "deleted_at" not in user_cols:
            conn.execute("ALTER TABLE users ADD COLUMN deleted_at TEXT")
        conn.execute(
            """
            CREATE TABLE IF NOT EXISTS documents (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                title TEXT NOT NULL,
                content_html TEXT DEFAULT '',
                category TEXT,
                task_id INTEGER,
                created_by INTEGER NOT NULL,
                updated_by INTEGER,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL,
                deleted_at TEXT,
                FOREIGN KEY (task_id) REFERENCES tasks(id),
                FOREIGN KEY (created_by) REFERENCES users(id),
                FOREIGN KEY (updated_by) REFERENCES users(id)
            )
            """
        )


def hash_password(password: str) -> str:
    return pwd_context.hash(password)


def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)


def user_count() -> int:
    with get_db() as conn:
        row = conn.execute("SELECT COUNT(*) AS c FROM users").fetchone()
        return int(row["c"])


def create_admin_from_env() -> bool:
    username = os.environ.get("AZA_INTERN_ADMIN_USER", "").strip()
    password = os.environ.get("AZA_INTERN_ADMIN_PASSWORD", "").strip()
    if not username or not password:
        return False
    if user_count() > 0:
        return False
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            "INSERT INTO users (username, password_hash, role, is_active, created_at, updated_at) VALUES (?, ?, 'admin', 1, ?, ?)",
            (username, hash_password(password), ts, ts),
        )
    return True


def get_csrf_token(request: Request) -> str:
    if "csrf_token" not in request.session:
        request.session["csrf_token"] = secrets.token_hex(32)
    return request.session["csrf_token"]


def verify_csrf(request: Request, token: str) -> None:
    expected = request.session.get("csrf_token")
    if not expected or not token or not secrets.compare_digest(expected, token):
        raise HTTPException(status_code=403, detail="CSRF-Token ungültig")


def get_current_user(request: Request) -> Optional[dict[str, Any]]:
    uid = request.session.get("user_id")
    if not uid:
        return None
    with get_db() as conn:
        row = conn.execute(
            "SELECT id, username, display_name, role, is_active FROM users WHERE id = ? AND deleted_at IS NULL",
            (uid,),
        ).fetchone()
    if not row or not row["is_active"]:
        return None
    return dict(row)


def require_login(request: Request) -> dict[str, Any]:
    user = get_current_user(request)
    if not user:
        raise HTTPException(status_code=303, headers={"Location": "/login"})
    return user


def require_admin(request: Request) -> dict[str, Any]:
    user = require_login(request)
    if user["role"] != "admin":
        raise HTTPException(status_code=403, detail="Admin-Rechte erforderlich")
    return user


def template_ctx(request: Request, user: Optional[dict] = None, **extra) -> dict:
    ctx = {
        "request": request,
        "user": user,
        "csrf_token": get_csrf_token(request),
        "categories": CATEGORIES,
        "task_statuses": TASK_STATUSES,
        "task_priorities": TASK_PRIORITIES,
        "roles": ROLES,
        "max_upload_bytes": MAX_UPLOAD_BYTES,
        "max_upload_mb": MAX_UPLOAD_MB,
        "upload_allowed_extensions": sorted(ALLOWED_EXTENSIONS),
        "upload_blocked_extensions": sorted(BLOCKED_EXTENSIONS),
        "upload_hint_line1": UPLOAD_HINT_LINE1,
        "upload_hint_line2": UPLOAD_HINT_LINE2,
        "upload_hint_line3": UPLOAD_HINT_LINE3,
    }
    ctx.update(extra)
    return ctx


def safe_filename(name: str) -> str:
    name = os.path.basename(name or "file")
    name = re.sub(r"[^\w.\- ]", "_", name, flags=re.UNICODE)
    return name[:200] or "file"


def upload_extension_error(filename: str) -> Optional[str]:
    ext = Path(filename or "").suffix.lower()
    if not ext:
        return "type"
    if ext in BLOCKED_EXTENSIONS:
        return "blocked"
    if ext not in ALLOWED_EXTENSIONS:
        return "type"
    return None


def allowed_extension(filename: str) -> bool:
    return upload_extension_error(filename) is None


def is_odt_file(filename: str) -> bool:
    return Path(filename or "").suffix.lower() == ".odt"


ALLOWED_HTML_TAGS = frozenset({"b", "strong", "i", "em", "u", "p", "br", "ul", "ol", "li", "h1", "h2", "h3", "a"})
ALLOWED_HTML_ATTRS = frozenset({"href", "title", "target"})


class _HtmlSanitizer(HTMLParser):
    def __init__(self) -> None:
        super().__init__()
        self._parts: list[str] = []

    def handle_starttag(self, tag: str, attrs: list[tuple[str, Optional[str]]]) -> None:
        tag = tag.lower()
        if tag not in ALLOWED_HTML_TAGS:
            return
        if tag == "br":
            self._parts.append("<br>")
            return
        safe_attrs: list[tuple[str, str]] = []
        for key, val in attrs:
            key = key.lower()
            if key not in ALLOWED_HTML_ATTRS or val is None:
                continue
            val = val.strip()
            if key == "href" and val.lower().startswith(("javascript:", "data:")):
                continue
            safe_attrs.append((key, html_module.escape(val, quote=True)))
        attr_str = "".join(f' {k}="{v}"' for k, v in safe_attrs)
        self._parts.append(f"<{tag}{attr_str}>")

    def handle_endtag(self, tag: str) -> None:
        tag = tag.lower()
        if tag in ALLOWED_HTML_TAGS and tag != "br":
            self._parts.append(f"</{tag}>")

    def handle_data(self, data: str) -> None:
        self._parts.append(html_module.escape(data))

    def get_html(self) -> str:
        return "".join(self._parts)


def sanitize_html(raw: str) -> str:
    if not raw:
        return ""
    cleaned = re.sub(
        r"<\s*(script|iframe|object|embed|style)[^>]*>.*?<\s*/\s*\1\s*>",
        "",
        raw,
        flags=re.I | re.S,
    )
    cleaned = re.sub(r"<\s*(script|iframe|object|embed|style)[^>]*/?\s*>", "", cleaned, flags=re.I)
    cleaned = re.sub(r"\s+on\w+\s*=\s*(['\"]).*?\1", "", cleaned, flags=re.I)
    cleaned = re.sub(r"\s+on\w+\s*=\s*[^\s>]+", "", cleaned, flags=re.I)
    parser = _HtmlSanitizer()
    parser.feed(cleaned)
    parser.close()
    return parser.get_html()


def strip_html_text(raw: str) -> str:
    return re.sub(r"<[^>]+>", " ", raw or "").strip()


def all_tasks_for_select() -> list[dict]:
    with get_db() as conn:
        return [
            dict(r)
            for r in conn.execute(
                """
                SELECT id, title FROM tasks
                WHERE status != 'Archiv'
                ORDER BY updated_at DESC LIMIT 200
                """
            ).fetchall()
        ]


def get_document(doc_id: int, include_deleted: bool = False) -> Optional[dict]:
    with get_db() as conn:
        q = """
            SELECT d.*, c.username AS creator_username, u.username AS updater_username,
                   t.title AS task_title
            FROM documents d
            JOIN users c ON c.id = d.created_by
            LEFT JOIN users u ON u.id = d.updated_by
            LEFT JOIN tasks t ON t.id = d.task_id
            WHERE d.id = ?
        """
        if not include_deleted:
            q += " AND d.deleted_at IS NULL"
        row = conn.execute(q, (doc_id,)).fetchone()
    return dict(row) if row else None


async def save_uploaded_file(
    upload: UploadFile,
    user_id: int,
    *,
    category: str = "",
    description: str = "",
    tags: str = "",
    task_id: Optional[int] = None,
) -> tuple[bool, str, Optional[dict[str, Any]]]:
    orig = safe_filename(upload.filename or "file")
    ext_err = upload_extension_error(orig)
    if ext_err == "blocked":
        return False, "blocked", None
    if ext_err == "type":
        return False, "type", None
    content = await upload.read()
    if len(content) > MAX_UPLOAD_BYTES:
        return False, "size", None
    stored = f"{uuid.uuid4().hex}{Path(orig).suffix.lower()}"
    if ".." in stored or "/" in stored or "\\" in stored:
        return False, "invalid", None
    dest = UPLOAD_DIR / stored
    dest.write_bytes(content)
    ts = now_iso()
    with get_db() as conn:
        if task_id is not None:
            task = conn.execute("SELECT id FROM tasks WHERE id = ?", (task_id,)).fetchone()
            if not task:
                dest.unlink(missing_ok=True)
                return False, "task_not_found", None
        cur = conn.execute(
            """
            INSERT INTO files (original_filename, stored_filename, content_type, size_bytes,
                               category, description, task_id, uploaded_by, created_at)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
            """,
            (
                orig,
                stored,
                upload.content_type or "application/octet-stream",
                len(content),
                category or None,
                description.strip() or None,
                task_id,
                user_id,
                ts,
            ),
        )
        file_id = int(cur.lastrowid)
        set_item_tags(conn, "file", file_id, tags)
        if task_id is not None:
            conn.execute("UPDATE tasks SET updated_at = ? WHERE id = ?", (ts, task_id))
        row = conn.execute(
            """
            SELECT f.*, u.username AS uploader
            FROM files f JOIN users u ON u.id = f.uploaded_by
            WHERE f.id = ?
            """,
            (file_id,),
        ).fetchone()
    file_data = dict(row) if row else None
    if file_data:
        with get_db() as conn:
            file_data["tags"] = get_item_tags(conn, "file", file_id)
    return True, "ok", file_data


def get_or_create_tag(conn: sqlite3.Connection, name: str) -> int:
    name = name.strip()
    if not name:
        raise ValueError("Leerer Tag")
    row = conn.execute("SELECT id FROM tags WHERE name = ?", (name,)).fetchone()
    if row:
        return int(row["id"])
    cur = conn.execute("INSERT INTO tags (name) VALUES (?)", (name,))
    return int(cur.lastrowid)


def set_item_tags(conn: sqlite3.Connection, item_type: str, item_id: int, tag_names: str) -> None:
    conn.execute(
        "DELETE FROM item_tags WHERE item_type = ? AND item_id = ?",
        (item_type, item_id),
    )
    for part in re.split(r"[,;]", tag_names or ""):
        tag = part.strip()
        if not tag:
            continue
        tag_id = get_or_create_tag(conn, tag)
        conn.execute(
            "INSERT OR IGNORE INTO item_tags (tag_id, item_type, item_id) VALUES (?, ?, ?)",
            (tag_id, item_type, item_id),
        )


def get_item_tags(conn: sqlite3.Connection, item_type: str, item_id: int) -> list[str]:
    rows = conn.execute(
        """
        SELECT t.name FROM tags t
        JOIN item_tags it ON it.tag_id = t.id
        WHERE it.item_type = ? AND it.item_id = ?
        ORDER BY t.name
        """,
        (item_type, item_id),
    ).fetchall()
    return [r["name"] for r in rows]


def all_users(active_only: bool = True) -> list[dict]:
    with get_db() as conn:
        q = "SELECT id, username, display_name, role, is_active, created_at FROM users WHERE deleted_at IS NULL"
        if active_only:
            q += " AND is_active = 1"
        q += " ORDER BY username"
        return [dict(r) for r in conn.execute(q).fetchall()]


def get_user_profile(user_id: int) -> Optional[dict[str, Any]]:
    with get_db() as conn:
        row = conn.execute(
            "SELECT id, username, display_name, role, is_active, created_at, updated_at FROM users WHERE id = ? AND deleted_at IS NULL",
            (user_id,),
        ).fetchone()
    return dict(row) if row else None


@app.on_event("startup")
def on_startup() -> None:
    init_db()
    migrate_db()
    create_admin_from_env()


@app.get("/health")
def health() -> dict:
    return {"status": "ok", "service": "aza-intern"}


@app.get("/login", response_class=HTMLResponse)
def login_page(request: Request):
    if get_current_user(request):
        return RedirectResponse("/", status_code=303)
    if user_count() == 0:
        return RedirectResponse("/setup", status_code=303)
    return templates.TemplateResponse(
        "login.html",
        template_ctx(request, error=request.query_params.get("error")),
    )


@app.post("/login")
def login_submit(
    request: Request,
    username: str = Form(...),
    password: str = Form(...),
    csrf_token: str = Form(...),
):
    verify_csrf(request, csrf_token)
    with get_db() as conn:
        row = conn.execute(
            "SELECT id, password_hash, is_active FROM users WHERE username = ? AND deleted_at IS NULL",
            (username.strip(),),
        ).fetchone()
    if not row or not row["is_active"] or not verify_password(password, row["password_hash"]):
        return RedirectResponse("/login?error=1", status_code=303)
    request.session["user_id"] = row["id"]
    return RedirectResponse("/", status_code=303)


@app.get("/setup", response_class=HTMLResponse)
def setup_page(request: Request):
    if user_count() > 0:
        return RedirectResponse("/login", status_code=303)
    return templates.TemplateResponse("setup.html", template_ctx(request))


@app.post("/setup")
def setup_submit(
    request: Request,
    username: str = Form(...),
    password: str = Form(...),
    password_confirm: str = Form(...),
    csrf_token: str = Form(...),
):
    verify_csrf(request, csrf_token)
    if user_count() > 0:
        raise HTTPException(status_code=403, detail="Setup bereits abgeschlossen")
    username = username.strip()
    if len(username) < 3:
        return templates.TemplateResponse(
            "setup.html",
            template_ctx(request, error="Benutzername mindestens 3 Zeichen."),
        )
    if len(password) < 8:
        return templates.TemplateResponse(
            "setup.html",
            template_ctx(request, error="Passwort mindestens 8 Zeichen."),
        )
    if password != password_confirm:
        return templates.TemplateResponse(
            "setup.html",
            template_ctx(request, error="Passwörter stimmen nicht überein."),
        )
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            "INSERT INTO users (username, password_hash, role, is_active, created_at, updated_at) VALUES (?, ?, 'admin', 1, ?, ?)",
            (username, hash_password(password), ts, ts),
        )
    request.session["user_id"] = 1
    return RedirectResponse("/", status_code=303)


@app.post("/logout")
def logout(request: Request, csrf_token: str = Form(...)):
    verify_csrf(request, csrf_token)
    request.session.clear()
    return RedirectResponse("/login", status_code=303)


@app.get("/", response_class=HTMLResponse)
def dashboard(request: Request):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    with get_db() as conn:
        open_tasks = conn.execute(
            """
            SELECT t.*, u.username AS assigned_username
            FROM tasks t
            LEFT JOIN users u ON u.id = t.assigned_to
            WHERE t.status NOT IN ('Erledigt', 'Archiv')
            ORDER BY CASE t.priority WHEN 'hoch' THEN 0 WHEN 'normal' THEN 1 ELSE 2 END, t.updated_at DESC
            LIMIT 10
            """
        ).fetchall()
        waiting_tasks = conn.execute(
            """
            SELECT t.*, u.username AS assigned_username
            FROM tasks t
            LEFT JOIN users u ON u.id = t.assigned_to
            WHERE t.status = 'Warten auf André'
            ORDER BY t.updated_at DESC LIMIT 5
            """
        ).fetchall()
        recent_files = conn.execute(
            """
            SELECT f.*, u.username AS uploader
            FROM files f JOIN users u ON u.id = f.uploaded_by
            ORDER BY f.created_at DESC LIMIT 5
            """
        ).fetchall()
        recent_notes = conn.execute(
            """
            SELECT n.*, u.username AS author
            FROM notes n JOIN users u ON u.id = n.created_by
            ORDER BY n.updated_at DESC LIMIT 5
            """
        ).fetchall()
    return templates.TemplateResponse(
        "dashboard.html",
        template_ctx(
            request, user,
            open_tasks=[dict(r) for r in open_tasks],
            waiting_tasks=[dict(r) for r in waiting_tasks],
            recent_files=[dict(r) for r in recent_files],
            recent_notes=[dict(r) for r in recent_notes],
        ),
    )


@app.get("/tasks", response_class=HTMLResponse)
def tasks_list(request: Request, status: str = "", category: str = ""):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    q = """
        SELECT t.*, u.username AS assigned_username, c.username AS creator_username
        FROM tasks t
        LEFT JOIN users u ON u.id = t.assigned_to
        LEFT JOIN users c ON c.id = t.created_by
        WHERE 1=1
    """
    params: list[Any] = []
    if status:
        q += " AND t.status = ?"
        params.append(status)
    if category:
        q += " AND t.category = ?"
        params.append(category)
    q += " ORDER BY t.updated_at DESC"
    with get_db() as conn:
        tasks = [dict(r) for r in conn.execute(q, params).fetchall()]
        for t in tasks:
            t["tags"] = get_item_tags(conn, "task", t["id"])
    return templates.TemplateResponse(
        "tasks_list.html",
        template_ctx(request, user, tasks=tasks, filter_status=status, filter_category=category),
    )


@app.get("/tasks/new", response_class=HTMLResponse)
def task_new_page(request: Request):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    return templates.TemplateResponse(
        "task_form.html",
        template_ctx(request, user, task=None, users=all_users()),
    )


@app.post("/tasks/new")
def task_create(
    request: Request,
    title: str = Form(...),
    description: str = Form(""),
    status: str = Form("Neu"),
    priority: str = Form("normal"),
    category: str = Form(""),
    assigned_to: str = Form(""),
    due_date: str = Form(""),
    tags: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    if status not in TASK_STATUSES:
        status = "Neu"
    if priority not in TASK_PRIORITIES:
        priority = "normal"
    assign_id = int(assigned_to) if assigned_to.isdigit() else None
    ts = now_iso()
    with get_db() as conn:
        cur = conn.execute(
            """
            INSERT INTO tasks (title, description, status, priority, category, assigned_to, due_date, created_by, created_at, updated_at)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
            """,
            (title.strip(), description.strip(), status, priority, category or None,
             assign_id, due_date or None, user["id"], ts, ts),
        )
        task_id = int(cur.lastrowid)
        set_item_tags(conn, "task", task_id, tags)
    return RedirectResponse(f"/tasks/{task_id}", status_code=303)


@app.get("/tasks/{task_id}", response_class=HTMLResponse)
def task_detail(request: Request, task_id: int):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    with get_db() as conn:
        task = conn.execute(
            """
            SELECT t.*, u.username AS assigned_username, c.username AS creator_username
            FROM tasks t
            LEFT JOIN users u ON u.id = t.assigned_to
            LEFT JOIN users c ON c.id = t.created_by
            WHERE t.id = ?
            """,
            (task_id,),
        ).fetchone()
        if not task:
            raise HTTPException(status_code=404)
        comments = conn.execute(
            """
            SELECT tc.*, u.username FROM task_comments tc
            JOIN users u ON u.id = tc.user_id
            WHERE tc.task_id = ? ORDER BY tc.created_at ASC
            """,
            (task_id,),
        ).fetchall()
        tags = get_item_tags(conn, "task", task_id)
        task_files = conn.execute(
            """
            SELECT f.*, u.username AS uploader
            FROM files f JOIN users u ON u.id = f.uploaded_by
            WHERE f.task_id = ?
            ORDER BY f.created_at DESC
            """,
            (task_id,),
        ).fetchall()
        task_files_list = [dict(r) for r in task_files]
        for tf in task_files_list:
            tf["tags"] = get_item_tags(conn, "file", tf["id"])
        task_documents = conn.execute(
            """
            SELECT d.id, d.title, d.category, d.updated_at, c.username AS creator_username
            FROM documents d
            JOIN users c ON c.id = d.created_by
            WHERE d.task_id = ? AND d.deleted_at IS NULL
            ORDER BY d.updated_at DESC
            """,
            (task_id,),
        ).fetchall()
    return templates.TemplateResponse(
        "task_detail.html",
        template_ctx(
            request, user,
            task=dict(task),
            comments=[dict(c) for c in comments],
            tags=tags,
            users=all_users(),
            task_files=task_files_list,
            task_documents=[dict(r) for r in task_documents],
        ),
    )


@app.get("/tasks/{task_id}/edit", response_class=HTMLResponse)
def task_edit_page(request: Request, task_id: int):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    with get_db() as conn:
        task = conn.execute("SELECT * FROM tasks WHERE id = ?", (task_id,)).fetchone()
        if not task:
            raise HTTPException(status_code=404)
        tags = ", ".join(get_item_tags(conn, "task", task_id))
    t = dict(task)
    t["tags_str"] = tags
    return templates.TemplateResponse(
        "task_form.html",
        template_ctx(request, user, task=t, users=all_users()),
    )


@app.post("/tasks/{task_id}/edit")
def task_update(
    request: Request,
    task_id: int,
    title: str = Form(...),
    description: str = Form(""),
    status: str = Form("Neu"),
    priority: str = Form("normal"),
    category: str = Form(""),
    assigned_to: str = Form(""),
    due_date: str = Form(""),
    tags: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    if status not in TASK_STATUSES:
        status = "Neu"
    if priority not in TASK_PRIORITIES:
        priority = "normal"
    assign_id = int(assigned_to) if assigned_to.isdigit() else None
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            """
            UPDATE tasks SET title=?, description=?, status=?, priority=?, category=?,
            assigned_to=?, due_date=?, updated_at=? WHERE id=?
            """,
            (title.strip(), description.strip(), status, priority, category or None,
             assign_id, due_date or None, ts, task_id),
        )
        set_item_tags(conn, "task", task_id, tags)
    return RedirectResponse(f"/tasks/{task_id}", status_code=303)


@app.post("/tasks/{task_id}/comment")
def task_add_comment(
    request: Request,
    task_id: int,
    comment: str = Form(...),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    text = comment.strip()
    if not text:
        return RedirectResponse(f"/tasks/{task_id}", status_code=303)
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            "INSERT INTO task_comments (task_id, user_id, comment, created_at) VALUES (?, ?, ?, ?)",
            (task_id, user["id"], text, ts),
        )
        conn.execute("UPDATE tasks SET updated_at = ? WHERE id = ?", (ts, task_id))
    return RedirectResponse(f"/tasks/{task_id}", status_code=303)


@app.get("/files", response_class=HTMLResponse)
def files_list(request: Request, category: str = ""):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    q = """
        SELECT f.*, u.username AS uploader
        FROM files f JOIN users u ON u.id = f.uploaded_by
        WHERE 1=1
    """
    params: list[Any] = []
    if category:
        q += " AND f.category = ?"
        params.append(category)
    q += " ORDER BY f.created_at DESC"
    with get_db() as conn:
        files = [dict(r) for r in conn.execute(q, params).fetchall()]
        for f in files:
            f["tags"] = get_item_tags(conn, "file", f["id"])
    return templates.TemplateResponse(
        "files_list.html",
        template_ctx(request, user, files=files, filter_category=category),
    )


@app.post("/files/upload")
async def file_upload(
    request: Request,
    upload: UploadFile = File(...),
    category: str = Form(""),
    description: str = Form(""),
    tags: str = Form(""),
    task_id: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    tid = int(task_id) if task_id.isdigit() else None
    ok, err, _ = await save_uploaded_file(
        upload, user["id"], category=category, description=description, tags=tags, task_id=tid,
    )
    if not ok:
        if tid:
            return RedirectResponse(f"/tasks/{tid}?error={err}", status_code=303)
        return RedirectResponse(f"/files?error={err}", status_code=303)
    if tid:
        return RedirectResponse(f"/tasks/{tid}?upload=ok", status_code=303)
    return RedirectResponse("/files?upload=ok", status_code=303)


@app.post("/api/files/upload")
async def api_file_upload(
    request: Request,
    upload: UploadFile = File(...),
    category: str = Form(""),
    description: str = Form(""),
    tags: str = Form(""),
    task_id: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    tid = int(task_id) if task_id.isdigit() else None
    ok, err, file_data = await save_uploaded_file(
        upload, user["id"], category=category, description=description, tags=tags, task_id=tid,
    )
    if not ok:
        messages = {
            "blocked": "Dieser Dateityp ist aus Sicherheitsgründen nicht erlaubt.",
            "type": "Dateityp nicht erlaubt.",
            "size": f"Datei zu gross (max. {MAX_UPLOAD_MB} MB).",
            "task_not_found": "Aufgabe nicht gefunden.",
            "invalid": "Ungültiger Dateiname.",
        }
        return JSONResponse({"ok": False, "error": err, "message": messages.get(err, "Upload fehlgeschlagen.")})
    return JSONResponse({"ok": True, "file": file_data})


@app.get("/files/{file_id}/download")
def file_download(request: Request, file_id: int):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    with get_db() as conn:
        row = conn.execute("SELECT * FROM files WHERE id = ?", (file_id,)).fetchone()
    if not row:
        raise HTTPException(status_code=404)
    path = UPLOAD_DIR / row["stored_filename"]
    if not path.is_file() or ".." in row["stored_filename"]:
        raise HTTPException(status_code=404)
    return FileResponse(
        path,
        filename=row["original_filename"],
        media_type=row["content_type"] or "application/octet-stream",
    )


@app.get("/files/{file_id}/edit", response_class=HTMLResponse)
def file_edit_page(request: Request, file_id: int):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    with get_db() as conn:
        row = conn.execute(
            """
            SELECT f.*, u.username AS uploader
            FROM files f JOIN users u ON u.id = f.uploaded_by
            WHERE f.id = ?
            """,
            (file_id,),
        ).fetchone()
    if not row:
        raise HTTPException(status_code=404)
    file_info = dict(row)
    odt = is_odt_file(file_info["original_filename"])
    return templates.TemplateResponse(
        "file_edit.html",
        template_ctx(request, user, file=file_info, is_odt=odt),
    )


@app.get("/notes", response_class=HTMLResponse)
def notes_list(request: Request, category: str = ""):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    q = """
        SELECT n.*, u.username AS author
        FROM notes n JOIN users u ON u.id = n.created_by
        WHERE 1=1
    """
    params: list[Any] = []
    if category:
        q += " AND n.category = ?"
        params.append(category)
    q += " ORDER BY n.updated_at DESC"
    with get_db() as conn:
        notes = [dict(r) for r in conn.execute(q, params).fetchall()]
        for n in notes:
            n["tags"] = get_item_tags(conn, "note", n["id"])
    return templates.TemplateResponse(
        "notes_list.html",
        template_ctx(request, user, notes=notes, filter_category=category),
    )


@app.get("/notes/new", response_class=HTMLResponse)
def note_new_page(request: Request):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    return templates.TemplateResponse(
        "note_form.html",
        template_ctx(request, user, note=None),
    )


@app.post("/notes/new")
def note_create(
    request: Request,
    title: str = Form(...),
    body: str = Form(""),
    category: str = Form(""),
    tags: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    ts = now_iso()
    with get_db() as conn:
        cur = conn.execute(
            "INSERT INTO notes (title, body, category, created_by, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?)",
            (title.strip(), body.strip(), category or None, user["id"], ts, ts),
        )
        set_item_tags(conn, "note", int(cur.lastrowid), tags)
    return RedirectResponse("/notes", status_code=303)


@app.get("/notes/{note_id}/edit", response_class=HTMLResponse)
def note_edit_page(request: Request, note_id: int):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    with get_db() as conn:
        note = conn.execute("SELECT * FROM notes WHERE id = ?", (note_id,)).fetchone()
        if not note:
            raise HTTPException(status_code=404)
        tags = ", ".join(get_item_tags(conn, "note", note_id))
    n = dict(note)
    n["tags_str"] = tags
    return templates.TemplateResponse(
        "note_form.html",
        template_ctx(request, user, note=n),
    )


@app.post("/notes/{note_id}/edit")
def note_update(
    request: Request,
    note_id: int,
    title: str = Form(...),
    body: str = Form(""),
    category: str = Form(""),
    tags: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            "UPDATE notes SET title=?, body=?, category=?, updated_at=? WHERE id=?",
            (title.strip(), body.strip(), category or None, ts, note_id),
        )
        set_item_tags(conn, "note", note_id, tags)
    return RedirectResponse("/notes", status_code=303)


@app.get("/documents", response_class=HTMLResponse)
def documents_list(request: Request):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    with get_db() as conn:
        docs = [
            dict(r)
            for r in conn.execute(
                """
                SELECT d.id, d.title, d.category, d.updated_at, d.created_at,
                       c.username AS creator_username, t.title AS task_title, d.task_id
                FROM documents d
                JOIN users c ON c.id = d.created_by
                LEFT JOIN tasks t ON t.id = d.task_id
                WHERE d.deleted_at IS NULL
                ORDER BY d.updated_at DESC
                """
            ).fetchall()
        ]
    return templates.TemplateResponse(
        "documents_list.html",
        template_ctx(request, user, documents=docs, message=request.query_params.get("msg")),
    )


@app.get("/documents/new", response_class=HTMLResponse)
def document_new_page(request: Request, task_id: str = ""):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    pre_task = int(task_id) if task_id.isdigit() else None
    return templates.TemplateResponse(
        "document_new.html",
        template_ctx(request, user, tasks=all_tasks_for_select(), pre_task_id=pre_task),
    )


@app.post("/documents/new")
def document_create(
    request: Request,
    title: str = Form(...),
    category: str = Form(""),
    task_id: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    title = title.strip() or "Unbenanntes Dokument"
    tid = int(task_id) if task_id.isdigit() else None
    ts = now_iso()
    with get_db() as conn:
        if tid is not None:
            task = conn.execute("SELECT id FROM tasks WHERE id = ?", (tid,)).fetchone()
            if not task:
                tid = None
        cur = conn.execute(
            """
            INSERT INTO documents (title, content_html, category, task_id, created_by, updated_by, created_at, updated_at)
            VALUES (?, '', ?, ?, ?, ?, ?, ?)
            """,
            (title, category or None, tid, user["id"], user["id"], ts, ts),
        )
        doc_id = int(cur.lastrowid)
    return RedirectResponse(f"/documents/{doc_id}", status_code=303)


@app.get("/documents/{document_id}", response_class=HTMLResponse)
def document_edit_page(request: Request, document_id: int):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    doc = get_document(document_id)
    if not doc:
        raise HTTPException(status_code=404)
    return templates.TemplateResponse(
        "document_edit.html",
        template_ctx(request, user, document=doc, tasks=all_tasks_for_select()),
    )


@app.post("/api/documents/{document_id}/save")
async def api_document_save(
    request: Request,
    document_id: int,
    title: str = Form(...),
    content_html: str = Form(""),
    category: str = Form(""),
    task_id: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    doc = get_document(document_id)
    if not doc:
        return JSONResponse({"ok": False, "error": "not_found", "message": "Dokument nicht gefunden."}, status_code=404)
    title = title.strip() or "Unbenanntes Dokument"
    tid = int(task_id) if task_id.isdigit() else None
    if tid is not None:
        with get_db() as conn:
            task = conn.execute("SELECT id FROM tasks WHERE id = ?", (tid,)).fetchone()
            if not task:
                tid = None
    safe_html = sanitize_html(content_html)
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            """
            UPDATE documents SET title=?, content_html=?, category=?, task_id=?,
            updated_by=?, updated_at=? WHERE id=? AND deleted_at IS NULL
            """,
            (title, safe_html, category or None, tid, user["id"], ts, document_id),
        )
    return JSONResponse({
        "ok": True,
        "updated_at": ts,
        "title": title,
    })


@app.post("/documents/{document_id}/delete")
def document_delete(
    request: Request,
    document_id: int,
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    doc = get_document(document_id)
    if not doc:
        raise HTTPException(status_code=404)
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            "UPDATE documents SET deleted_at = ?, updated_by = ?, updated_at = ? WHERE id = ?",
            (ts, user["id"], ts, document_id),
        )
    return RedirectResponse("/documents?msg=deleted", status_code=303)


@app.get("/search", response_class=HTMLResponse)
def search_page(request: Request, q: str = ""):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    results: dict[str, list] = {"tasks": [], "files": [], "notes": [], "documents": []}
    term = q.strip()
    if term:
        like = f"%{term}%"
        with get_db() as conn:
            results["tasks"] = [
                dict(r) for r in conn.execute(
                    """
                    SELECT id, title, status, category, updated_at FROM tasks
                    WHERE title LIKE ? OR description LIKE ? OR category LIKE ?
                    ORDER BY updated_at DESC LIMIT 30
                    """,
                    (like, like, like),
                ).fetchall()
            ]
            results["files"] = [
                dict(r) for r in conn.execute(
                    """
                    SELECT id, original_filename, category, description, created_at FROM files
                    WHERE original_filename LIKE ? OR description LIKE ? OR category LIKE ?
                    ORDER BY created_at DESC LIMIT 30
                    """,
                    (like, like, like),
                ).fetchall()
            ]
            results["notes"] = [
                dict(r) for r in conn.execute(
                    """
                    SELECT id, title, category, updated_at FROM notes
                    WHERE title LIKE ? OR body LIKE ? OR category LIKE ?
                    ORDER BY updated_at DESC LIMIT 30
                    """,
                    (like, like, like),
                ).fetchall()
            ]
            doc_rows = conn.execute(
                """
                SELECT id, title, category, updated_at, content_html FROM documents
                WHERE deleted_at IS NULL
                AND (title LIKE ? OR category LIKE ? OR content_html LIKE ?)
                ORDER BY updated_at DESC LIMIT 30
                """,
                (like, like, like),
            ).fetchall()
            results["documents"] = [
                {k: r[k] for k in ("id", "title", "category", "updated_at")}
                for r in doc_rows
            ]
            tag_rows = conn.execute(
                "SELECT item_type, item_id FROM item_tags it JOIN tags t ON t.id = it.tag_id WHERE t.name LIKE ?",
                (like,),
            ).fetchall()
            for tr in tag_rows:
                itype, iid = tr["item_type"], tr["item_id"]
                if itype == "task" and not any(t["id"] == iid for t in results["tasks"]):
                    row = conn.execute("SELECT id, title, status, category, updated_at FROM tasks WHERE id=?", (iid,)).fetchone()
                    if row:
                        results["tasks"].append(dict(row))
                elif itype == "file" and not any(f["id"] == iid for f in results["files"]):
                    row = conn.execute(
                        "SELECT id, original_filename, category, description, created_at FROM files WHERE id=?", (iid,),
                    ).fetchone()
                    if row:
                        results["files"].append(dict(row))
                elif itype == "note" and not any(n["id"] == iid for n in results["notes"]):
                    row = conn.execute("SELECT id, title, category, updated_at FROM notes WHERE id=?", (iid,)).fetchone()
                    if row:
                        results["notes"].append(dict(row))
    return templates.TemplateResponse(
        "search.html",
        template_ctx(request, user, query=term, results=results),
    )


@app.get("/admin", response_class=HTMLResponse)
def admin_page(request: Request):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    if user["role"] != "admin":
        raise HTTPException(status_code=403, detail="Nur für Administratoren")
    with get_db() as conn:
        users = [dict(r) for r in conn.execute(
            """
            SELECT id, username, display_name, role, is_active, deleted_at, created_at, updated_at
            FROM users ORDER BY username
            """
        ).fetchall()]
    return templates.TemplateResponse(
        "admin.html",
        template_ctx(request, user, users=users, message=request.query_params.get("msg")),
    )


@app.get("/profile", response_class=HTMLResponse)
def profile_page(request: Request):
    user = get_current_user(request)
    if not user:
        return RedirectResponse("/login", status_code=303)
    profile = get_user_profile(user["id"])
    if not profile:
        return RedirectResponse("/login", status_code=303)
    return templates.TemplateResponse(
        "profile.html",
        template_ctx(request, user, profile=profile, message=request.query_params.get("msg")),
    )


@app.post("/profile/update")
def profile_update(
    request: Request,
    display_name: str = Form(""),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    name = display_name.strip() or None
    ts = now_iso()
    with get_db() as conn:
        conn.execute(
            "UPDATE users SET display_name = ?, updated_at = ? WHERE id = ?",
            (name, ts, user["id"]),
        )
    return RedirectResponse("/profile?msg=profile_saved", status_code=303)


@app.post("/profile/password")
def profile_password(
    request: Request,
    current_password: str = Form(...),
    new_password: str = Form(...),
    new_password_confirm: str = Form(...),
    csrf_token: str = Form(...),
):
    user = require_login(request)
    verify_csrf(request, csrf_token)
    if new_password != new_password_confirm:
        return RedirectResponse("/profile?msg=password_mismatch", status_code=303)
    if len(new_password) < 8:
        return RedirectResponse("/profile?msg=password_short", status_code=303)
    with get_db() as conn:
        row = conn.execute("SELECT password_hash FROM users WHERE id = ?", (user["id"],)).fetchone()
        if not row or not verify_password(current_password, row["password_hash"]):
            return RedirectResponse("/profile?msg=password_wrong", status_code=303)
        conn.execute(
            "UPDATE users SET password_hash = ?, updated_at = ? WHERE id = ?",
            (hash_password(new_password), now_iso(), user["id"]),
        )
    return RedirectResponse("/profile?msg=password_changed", status_code=303)


@app.post("/admin/users/new")
def admin_create_user(
    request: Request,
    username: str = Form(...),
    password: str = Form(...),
    display_name: str = Form(""),
    role: str = Form("assistant"),
    csrf_token: str = Form(...),
):
    admin = require_admin(request)
    verify_csrf(request, csrf_token)
    _ = admin
    username = username.strip()
    if len(username) < 3 or len(password) < 8:
        return RedirectResponse("/admin?msg=invalid", status_code=303)
    if role not in ROLES:
        role = "assistant"
    ts = now_iso()
    try:
        with get_db() as conn:
            conn.execute(
                """
                INSERT INTO users (username, password_hash, display_name, role, is_active, created_at, updated_at)
                VALUES (?, ?, ?, ?, 1, ?, ?)
                """,
                (username, hash_password(password), display_name.strip() or None, role, ts, ts),
            )
    except sqlite3.IntegrityError:
        return RedirectResponse("/admin?msg=exists", status_code=303)
    return RedirectResponse("/admin?msg=created", status_code=303)


@app.post("/admin/users/{user_id}/edit")
def admin_edit_user(
    request: Request,
    user_id: int,
    display_name: str = Form(""),
    role: str = Form("assistant"),
    password: str = Form(""),
    csrf_token: str = Form(...),
):
    admin = require_admin(request)
    verify_csrf(request, csrf_token)
    if role not in ROLES:
        role = "assistant"
    if user_id == admin["id"] and role != "admin":
        return RedirectResponse("/admin?msg=self_role", status_code=303)
    if password and len(password) < 8:
        return RedirectResponse("/admin?msg=invalid", status_code=303)
    ts = now_iso()
    with get_db() as conn:
        row = conn.execute("SELECT id FROM users WHERE id = ? AND deleted_at IS NULL", (user_id,)).fetchone()
        if not row:
            raise HTTPException(status_code=404)
        if password:
            conn.execute(
                "UPDATE users SET display_name=?, role=?, password_hash=?, updated_at=? WHERE id=?",
                (display_name.strip() or None, role, hash_password(password), ts, user_id),
            )
        else:
            conn.execute(
                "UPDATE users SET display_name=?, role=?, updated_at=? WHERE id=?",
                (display_name.strip() or None, role, ts, user_id),
            )
    return RedirectResponse("/admin?msg=updated", status_code=303)


@app.post("/admin/users/{user_id}/toggle")
def admin_toggle_user(
    request: Request,
    user_id: int,
    csrf_token: str = Form(...),
):
    admin = require_admin(request)
    verify_csrf(request, csrf_token)
    if user_id == admin["id"]:
        return RedirectResponse("/admin?msg=self", status_code=303)
    ts = now_iso()
    with get_db() as conn:
        row = conn.execute(
            "SELECT is_active FROM users WHERE id = ? AND deleted_at IS NULL", (user_id,),
        ).fetchone()
        if not row:
            raise HTTPException(status_code=404)
        new_val = 0 if row["is_active"] else 1
        conn.execute(
            "UPDATE users SET is_active = ?, updated_at = ? WHERE id = ?",
            (new_val, ts, user_id),
        )
    return RedirectResponse("/admin?msg=toggled", status_code=303)


@app.post("/admin/users/{user_id}/delete")
def admin_delete_user(
    request: Request,
    user_id: int,
    csrf_token: str = Form(...),
):
    admin = require_admin(request)
    verify_csrf(request, csrf_token)
    if user_id == admin["id"]:
        return RedirectResponse("/admin?msg=self", status_code=303)
    ts = now_iso()
    with get_db() as conn:
        row = conn.execute("SELECT id FROM users WHERE id = ? AND deleted_at IS NULL", (user_id,)).fetchone()
        if not row:
            raise HTTPException(status_code=404)
        conn.execute(
            "UPDATE users SET is_active = 0, deleted_at = ?, updated_at = ? WHERE id = ?",
            (ts, ts, user_id),
        )
    return RedirectResponse("/admin?msg=deleted", status_code=303)


if __name__ == "__main__":
    import uvicorn
    uvicorn.run("app:app", host="127.0.0.1", port=8088, reload=True)