# -*- coding: utf-8 -*-
"""Chat-Gerätekapazität: +5 Geräte pro aktiver AzA-Office-Lizenz (praxisbezogen).

Office-Geräte-Enforcement bleibt in aza_device_enforcement.py unverändert getrennt.
Dieses Modul liefert testbare Hilfsfunktionen für Limit-Berechnung und Geräte-Klassifikation.
"""

from __future__ import annotations

import sqlite3
from typing import Any, Iterable, Mapping, Optional

CHAT_DEVICES_PER_OFFICE_LICENSE = 5
DEVICE_SCOPE_OFFICE = "office"
DEVICE_SCOPE_CHAT = "chat"


def is_office_license_lookup_key(lookup_key: Optional[str]) -> bool:
    """True wenn die Lizenz Office umfasst (kein reines Chat-only-Produkt)."""
    try:
        from empfang_routes import _entitlements_from_lookup_key

        office_ok, _chat_ok = _entitlements_from_lookup_key(lookup_key)
        return bool(office_ok)
    except Exception:
        lk = (lookup_key or "").strip().lower()
        if not lk:
            return True
        chat_only_markers = (
            "chat_only", "chat-only", "aza_chat_only", "empfang_only",
            "minichat_only", "chatonly",
        )
        return not any(m in lk for m in chat_only_markers)


def is_active_license_status(status: Optional[str]) -> bool:
    return (status or "").strip().lower() == "active"


def count_active_office_licenses_for_practice(
    license_rows: Iterable[Mapping[str, Any]],
    practice_id: str,
) -> int:
    pid = (practice_id or "").strip()
    if not pid:
        return 0
    n = 0
    for row in license_rows:
        if not is_active_license_status(row.get("status")):
            continue
        if str(row.get("practice_id") or "").strip() != pid:
            continue
        if not is_office_license_lookup_key(row.get("lookup_key")):
            continue
        n += 1
    return n


def chat_device_limit_for_practice(
    license_rows: Iterable[Mapping[str, Any]],
    practice_id: str,
) -> int:
    return (
        count_active_office_licenses_for_practice(license_rows, practice_id)
        * CHAT_DEVICES_PER_OFFICE_LICENSE
    )


def infer_device_scope(device_name: str = "", app_version: str = "") -> str:
    """Klassifiziert ein Gerät als chat oder office anhand bekannter App-/Gerätenamen."""
    blob = f"{device_name or ''} {app_version or ''}".lower()
    chat_markers = (
        "empfangshell", "aza_empfangshell", "empfang",
        "kontaktpanel", "aza_kontaktpanel", "kontakt",
        "browser", "chat", "mobile", "tablet", "webchat",
    )
    for marker in chat_markers:
        if marker in blob:
            return DEVICE_SCOPE_CHAT
    return DEVICE_SCOPE_OFFICE


def count_devices_by_scope(
    devices_dict: Mapping[str, Any],
    *,
    practice_id: str = "",
    scope: str = DEVICE_SCOPE_CHAT,
) -> int:
    pid = (practice_id or "").strip()
    n = 0
    for d in devices_dict.values():
        if not isinstance(d, dict):
            continue
        if pid and str(d.get("practice_id") or "").strip() != pid:
            continue
        name = str(d.get("device_name") or d.get("name") or "")
        app_v = str(d.get("app_version") or d.get("app") or "")
        explicit = str(d.get("device_scope") or d.get("device_category") or "").strip().lower()
        if explicit in (DEVICE_SCOPE_CHAT, DEVICE_SCOPE_OFFICE):
            dev_scope = explicit
        else:
            dev_scope = infer_device_scope(name, app_v)
        if dev_scope == scope:
            n += 1
    return n


def count_active_office_licenses_sqlite(
    conn: sqlite3.Connection,
    practice_id: str,
) -> int:
    pid = (practice_id or "").strip()
    if not pid:
        return 0
    try:
        rows = conn.execute(
            """
            SELECT lookup_key FROM licenses
            WHERE lower(trim(coalesce(status, ''))) = 'active'
              AND trim(coalesce(practice_id, '')) = ?
            """,
            (pid,),
        ).fetchall()
    except sqlite3.Error:
        return 0
    return sum(1 for (lk,) in rows if is_office_license_lookup_key(lk))


def count_chat_devices_sqlite(conn: sqlite3.Connection, practice_id: str) -> int:
    pid = (practice_id or "").strip()
    if not pid:
        return 0
    try:
        cur = conn.execute(
            """
            SELECT COUNT(*) FROM device_bindings
            WHERE user_key = ?
              AND lower(coalesce(device_scope, 'office')) = 'chat'
              AND COALESCE(is_active, 1) = 1
            """,
            (pid,),
        )
        return int(cur.fetchone()[0])
    except sqlite3.Error:
        return 0


def count_office_devices_sqlite(
    conn: sqlite3.Connection,
    *,
    customer_email: str = "",
    user_key: str = "",
) -> int:
    clauses = ["COALESCE(is_active, 1) = 1", "lower(coalesce(device_scope, 'office')) = 'office'"]
    params: list[Any] = []
    if customer_email:
        clauses.append("lower(customer_email) = lower(?)")
        params.append(customer_email)
    if user_key:
        clauses.append("user_key = ?")
        params.append(user_key)
    try:
        cur = conn.execute(
            f"SELECT COUNT(*) FROM device_bindings WHERE {' AND '.join(clauses)}",
            params,
        )
        return int(cur.fetchone()[0])
    except sqlite3.Error:
        return 0


def practice_chat_capacity_from_db(db_path: str, practice_id: str) -> dict[str, Any]:
    """Read-only Chat-Kapazität aus SQLite (Backend / Kontroll-Hülle)."""
    pid = (practice_id or "").strip()
    if not pid:
        return {
            "practice_id": "",
            "contributing_office_licenses": 0,
            "chat_devices_per_license": CHAT_DEVICES_PER_OFFICE_LICENSE,
            "chat_device_limit": 0,
            "chat_devices_used": 0,
        }
    conn = sqlite3.connect(db_path)
    try:
        n_lic = count_active_office_licenses_sqlite(conn, pid)
        chat_used = count_chat_devices_sqlite(conn, pid)
        return {
            "practice_id": pid,
            "contributing_office_licenses": n_lic,
            "chat_devices_per_license": CHAT_DEVICES_PER_OFFICE_LICENSE,
            "chat_device_limit": n_lic * CHAT_DEVICES_PER_OFFICE_LICENSE,
            "chat_devices_used": chat_used,
        }
    finally:
        conn.close()


def practice_chat_capacity_snapshot(
    license_rows: Iterable[Mapping[str, Any]],
    devices_dict: Mapping[str, Any],
    practice_id: str,
) -> dict[str, Any]:
    """Read-only Kapazitätsübersicht für eine Praxis."""
    n_lic = count_active_office_licenses_for_practice(license_rows, practice_id)
    chat_limit = n_lic * CHAT_DEVICES_PER_OFFICE_LICENSE
    chat_used = count_devices_by_scope(
        devices_dict, practice_id=practice_id, scope=DEVICE_SCOPE_CHAT,
    )
    office_used = count_devices_by_scope(
        devices_dict, practice_id=practice_id, scope=DEVICE_SCOPE_OFFICE,
    )
    return {
        "practice_id": (practice_id or "").strip(),
        "contributing_office_licenses": n_lic,
        "chat_devices_per_license": CHAT_DEVICES_PER_OFFICE_LICENSE,
        "chat_device_limit": chat_limit,
        "chat_devices_used": chat_used,
        "office_devices_used": office_used,
    }