# -*- coding: utf-8 -*-
"""Phase 1b: Empfang-Gate, Practice-Mapping, Audio-Schätzung, Admin-CSV-Spalten (ohne Secrets)."""
from __future__ import annotations

import csv
import hashlib
import io
import os
import sqlite3
import struct
import tempfile
import unittest
from pathlib import Path
from unittest.mock import MagicMock, patch

from aza_ai_budget import (
    budget_gate_blocked_payload_or_none,
    ensure_ai_budget_schema,
    estimate_audio_seconds_for_transcription,
    resolve_license_for_empfang,
    resolve_license_for_practice_id,
)


def _mk_minimal_wav(path: Path, duration_sec: float = 0.5, sample_rate: int = 8000) -> None:
    """16-bit mono PCM WAV für Dauer-Test."""
    nframes = int(duration_sec * sample_rate)
    buf = io.BytesIO()
    buf.write(b"RIFF")
    buf.write(struct.pack("<I", 36 + nframes * 2))
    buf.write(b"WAVEfmt ")
    buf.write(
        struct.pack(
            "<IHHIIHH",
            16,
            1,
            1,
            sample_rate,
            sample_rate * 2,
            2,
            16,
        )
    )
    buf.write(b"data")
    buf.write(struct.pack("<I", nframes * 2))
    buf.write(b"\x00\x00" * nframes)
    path.write_bytes(buf.getvalue())


def _mk_db_device_and_practice(path: Path) -> None:
    now = 1_700_000_000
    con = sqlite3.connect(str(path))
    con.execute(
        """
        CREATE TABLE device_bindings (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          customer_email TEXT NOT NULL,
          user_key TEXT NOT NULL,
          device_hash TEXT NOT NULL,
          first_seen_at INTEGER NOT NULL,
          last_seen_at INTEGER NOT NULL,
          is_active INTEGER DEFAULT 1,
          UNIQUE(customer_email, user_key, device_hash)
        )
        """
    )
    con.execute(
        """
        CREATE TABLE licenses (
          subscription_id TEXT PRIMARY KEY,
          customer_id TEXT,
          status TEXT,
          lookup_key TEXT,
          allowed_users INTEGER,
          devices_per_user INTEGER,
          customer_email TEXT,
          client_reference_id TEXT,
          current_period_end INTEGER,
          current_period_start INTEGER,
          updated_at INTEGER NOT NULL,
          license_key TEXT,
          practice_id TEXT
        )
        """
    )
    con.execute(
        """
        INSERT INTO licenses(subscription_id, customer_id, status, lookup_key, allowed_users, devices_per_user,
          customer_email, client_reference_id, current_period_end, current_period_start, updated_at, license_key, practice_id)
        VALUES ('sub_ef', 'cus_x', 'active', 'aza_basic_monthly', 1, 2,
          'ef@example.test', NULL, ?, ?, ?, 'KEY', 'prac_ef_test')
        """,
        (now + 86400 * 30, now, now),
    )
    dh = hashlib.sha256(b"dev-ef-test").hexdigest()
    con.execute(
        """
        INSERT INTO device_bindings(customer_email, user_key, device_hash, first_seen_at, last_seen_at)
        VALUES ('ef@example.test', 'uk', ?, ?, ?)
        """,
        (dh, now, now),
    )
    con.commit()
    con.close()


class TestPhase1bResolve(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.NamedTemporaryFile(suffix=".sqlite", delete=False)
        self.tmp.close()
        self.db_path = Path(self.tmp.name)
        _mk_db_device_and_practice(self.db_path)

    def tearDown(self):
        try:
            os.unlink(self.db_path)
        except OSError:
            pass

    def test_resolve_by_practice(self):
        with sqlite3.connect(str(self.db_path)) as con:
            lic = resolve_license_for_practice_id(con, "prac_ef_test")
            self.assertIsNotNone(lic)
            self.assertEqual(lic.subscription_id, "sub_ef")

    def test_empfang_prefers_device_then_practice(self):
        with sqlite3.connect(str(self.db_path)) as con:
            lic = resolve_license_for_empfang(
                con, x_device_id="dev-ef-test", session_practice_id="prac_ef_test"
            )
            self.assertIsNotNone(lic)
            self.assertEqual(lic.customer_email, "ef@example.test")

    def test_empfang_device_practice_conflict_drops_device(self):
        with sqlite3.connect(str(self.db_path)) as con:
            lic = resolve_license_for_empfang(
                con, x_device_id="dev-ef-test", session_practice_id="prac_other"
            )
            self.assertIsNone(lic)


class TestPhase1bGateAndAudio(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.NamedTemporaryFile(suffix=".sqlite", delete=False)
        self.tmp.close()
        self.db_path = Path(self.tmp.name)
        _mk_db_device_and_practice(self.db_path)

    def tearDown(self):
        try:
            os.unlink(self.db_path)
        except OSError:
            pass

    def test_gate_blocked_payload(self):
        from aza_ai_budget import LicenseBudgetRow, insert_usage_event, sum_usage_usd_for_period

        with sqlite3.connect(str(self.db_path)) as con:
            ensure_ai_budget_schema(con)
            lic = resolve_license_for_practice_id(con, "prac_ef_test")
            assert lic is not None
            ps, pe = int(lic.period_start or 0), int(lic.period_end or 0)
            insert_usage_event(
                con,
                lic=lic,
                device_id=None,
                period_start=ps,
                period_end=pe,
                operation_type="chat",
                model="gpt-4o-mini",
                input_tokens=0,
                output_tokens=0,
                total_tokens=0,
                audio_seconds=0.0,
                estimated_cost_usd=50.0,
                request_id="x",
                status="success",
            )
            self.assertGreater(sum_usage_usd_for_period(con, lic.subscription_id, ps, pe), 9.0)
            blocked = budget_gate_blocked_payload_or_none(
                con,
                lic,
                device_id=None,
                request_id="r1",
                operation_type="transcription",
                model="whisper-1",
                gate_meta={"route": "test"},
            )
            self.assertIsNotNone(blocked)
            self.assertEqual(blocked.get("error_code"), "AI_BUDGET_EXCEEDED")

    def test_wav_duration_not_heuristic_only(self):
        wf = Path(self.tmp.name + ".wav")
        try:
            _mk_minimal_wav(wf, duration_sec=2.0, sample_rate=8000)
            sec = estimate_audio_seconds_for_transcription(
                byte_size=wf.stat().st_size,
                file_path=str(wf),
                suffix=".wav",
            )
            self.assertGreaterEqual(sec, 2.0)
            self.assertLessEqual(sec, 3.01)
        finally:
            try:
                wf.unlink()
            except OSError:
                pass

    def test_webm_uses_byte_heuristic(self):
        sec = estimate_audio_seconds_for_transcription(byte_size=100_000, suffix=".webm")
        self.assertEqual(sec, 10.0)


class TestPhase1bEmpfangBudgeted(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.NamedTemporaryFile(suffix=".sqlite", delete=False)
        self.tmp.close()
        self.db_path = Path(self.tmp.name)
        _mk_db_device_and_practice(self.db_path)

    def tearDown(self):
        try:
            os.unlink(self.db_path)
        except OSError:
            pass

    def test_when_stripe_db_missing_uses_core_only(self):
        from empfang_routes import _empfang_transcribe_openai_budgeted

        ghost = Path(self.tmp.name + "_nodb")
        with patch("backend_main._stripe_db_path", return_value=ghost):
            with patch(
                "empfang_routes._empfang_transcribe_openai_from_bytes_core",
                return_value=("ok", 5.0),
            ):
                req = MagicMock()
                req.headers.get.return_value = None
                br, tx = _empfang_transcribe_openai_budgeted(
                    req, b"\x00\x01", practice_id="prac_ef_test", filename_suffix=".webm"
                )
        self.assertIsNone(br)
        self.assertEqual(tx, "ok")

    def test_budgeted_gate_blocks_without_license_mapping(self):
        from empfang_routes import _empfang_transcribe_openai_budgeted

        req = MagicMock()
        req.headers.get.return_value = None
        with patch("backend_main._stripe_db_path", return_value=self.db_path):
            with patch("empfang_routes._empfang_transcribe_openai_from_bytes_core") as core:
                br, tx = _empfang_transcribe_openai_budgeted(
                    req, b"\x00", practice_id="prac_unknown", filename_suffix=".webm"
                )
        self.assertIsNotNone(br)
        self.assertIsNone(tx)
        self.assertEqual(br.status_code, 402)
        core.assert_not_called()

    def test_budgeted_records_success_after_core(self):
        from empfang_routes import _empfang_transcribe_openai_budgeted

        req = MagicMock()
        req.headers.get.return_value = None
        with patch("backend_main._stripe_db_path", return_value=self.db_path):
            with patch("empfang_routes._empfang_transcribe_openai_from_bytes_core", return_value=("txt", 12.3)):
                br, tx = _empfang_transcribe_openai_budgeted(
                    req, b"x" * 5000, practice_id="prac_ef_test", filename_suffix=".webm"
                )
        self.assertIsNone(br)
        self.assertEqual(tx, "txt")
        with sqlite3.connect(str(self.db_path)) as con:
            n = con.execute(
                "SELECT COUNT(*) FROM ai_usage_events WHERE status='success' AND operation_type='transcription'"
            ).fetchone()[0]
            self.assertGreaterEqual(n, 1)


class TestAdminCsvColumns(unittest.TestCase):
    def test_expected_headers_no_secret_tokens(self):
        forbidden_substrings = ("OPENAI", "API_KEY", "SECRET", "ADMIN_TOKEN", "MEDWORK", "password")
        row = [
            "sub_x",
            "user@example.test",
            "active",
            "aza_basic_monthly",
            "2026-01-01 00:00",
            "2026-02-01 00:00",
            10.0,
            3.7,
            6.3,
            63,
            5,
        ]
        buf = io.StringIO()
        w = csv.writer(buf)
        w.writerow([
            "subscription_id", "customer_email", "license_status", "lookup_key",
            "period_start_utc", "period_end_utc", "budget_usd", "used_usd", "remaining_usd",
            "available_percent", "event_count",
        ])
        w.writerow(row)
        out = buf.getvalue().upper()
        for bad in forbidden_substrings:
            self.assertNotIn(bad, out)


if __name__ == "__main__":
    unittest.main()