"""Tests for backend.app_controller.AppController."""

import sys
from datetime import datetime
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest

# Ensure project root is on path
project_root = Path(__file__).resolve().parent.parent.parent
sys.path.insert(0, str(project_root))

from backend.app_controller import AppState


# ── basic state ─────────────────────────────────────────────────────


def test_initial_state(controller):
    """A freshly constructed controller should be INITIALIZING and not transcribing."""
    assert controller.state == AppState.INITIALIZING
    assert controller.is_transcribing is False


# ── start / stop ────────────────────────────────────────────────────


def test_start_transcription_without_engine(controller):
    """Starting transcription before the engine is ready should fail gracefully."""
    controller.transcription_engine = None
    success, message = controller.start_transcription()
    assert success is False
    assert "not ready" in message.lower()


def test_start_stop_cycle(controller):
    """Full start -> stop cycle with a mocked engine that reports ready."""
    engine = MagicMock()
    engine.is_ready.return_value = True
    engine.start_recording.return_value = True
    controller.transcription_engine = engine

    # Start
    ok, msg = controller.start_transcription()
    assert ok is True
    assert controller.is_transcribing is True
    assert controller.state == AppState.TRANSCRIBING

    # Stop
    ok, msg = controller.stop_transcription()
    assert ok is True
    assert controller.is_transcribing is False
    engine.stop_recording.assert_called_once()


def test_double_start_rejected(controller):
    """Calling start_transcription twice should reject the second call."""
    engine = MagicMock()
    engine.is_ready.return_value = True
    engine.start_recording.return_value = True
    controller.transcription_engine = engine

    controller.start_transcription()
    success, message = controller.start_transcription()
    assert success is False
    assert "already" in message.lower()


# ── transcription storage ───────────────────────────────────────────


def test_clear_transcriptions(controller):
    """clear_transcriptions should empty the list and return the count."""
    from client.transcription_engine_realtime import TranscriptionResult

    controller.transcriptions = [
        TranscriptionResult(text="Hello", is_final=True, timestamp=datetime.now(), user_name="Alice"),
        TranscriptionResult(text="World", is_final=True, timestamp=datetime.now(), user_name="Bob"),
    ]
    count = controller.clear_transcriptions()
    assert count == 2
    assert len(controller.transcriptions) == 0


def test_get_transcriptions_text_with_timestamps(controller):
    """get_transcriptions_text should include [HH:MM:SS] prefixes when requested."""
    from client.transcription_engine_realtime import TranscriptionResult

    ts = datetime(2025, 1, 15, 10, 30, 45)
    controller.transcriptions = [
        TranscriptionResult(text="Test line", is_final=True, timestamp=ts, user_name="User"),
    ]

    text = controller.get_transcriptions_text(include_timestamps=True)
    assert "[10:30:45]" in text
    assert "User:" in text
    assert "Test line" in text


# ── settings / engine reload ────────────────────────────────────────


def test_apply_settings_triggers_reload_on_model_change(controller):
    """Changing the transcription model should trigger an engine reload."""
    controller.current_model_size = "base.en"
    controller.current_device_config = "auto"

    # Patch reload_engine so it doesn't actually try to spin up threads
    controller.reload_engine = MagicMock(return_value=(True, "reloaded"))

    reloaded, msg = controller.apply_settings({
        "transcription.model": "small.en",
    })

    assert reloaded is True
    controller.reload_engine.assert_called_once()


def test_apply_settings_no_reload_when_same(controller):
    """If model and device haven't changed, no reload should happen."""
    controller.current_model_size = "base.en"
    controller.current_device_config = "auto"

    # Ensure config returns the same values
    controller.config.set("transcription.model", "base.en")
    controller.config.set("transcription.device", "auto")

    controller.reload_engine = MagicMock(return_value=(True, "reloaded"))

    reloaded, msg = controller.apply_settings({
        "display.font_size": 20,
    })

    assert reloaded is False
    controller.reload_engine.assert_not_called()


# ── transcription callbacks ─────────────────────────────────────────


def test_on_final_transcription_callback_fires(controller):
    """_on_final_transcription should append and invoke on_transcription callback."""
    from client.transcription_engine_realtime import TranscriptionResult

    received = []
    controller.on_transcription = lambda data: received.append(data)

    controller.is_transcribing = True
    controller._set_state(AppState.TRANSCRIBING)

    result = TranscriptionResult(
        text="Hello world",
        is_final=True,
        timestamp=datetime.now(),
        user_name="Tester",
    )
    controller._on_final_transcription(result)

    assert len(controller.transcriptions) == 1
    assert len(received) == 1
    assert received[0]["text"] == "Hello world"
    assert received[0]["user_name"] == "Tester"
    assert received[0]["is_preview"] is False


def test_on_final_transcription_ignored_when_not_transcribing(controller):
    """If the controller is not in transcribing state the callback should be a no-op."""
    from client.transcription_engine_realtime import TranscriptionResult

    controller.is_transcribing = False

    result = TranscriptionResult(
        text="Should be ignored",
        is_final=True,
        timestamp=datetime.now(),
        user_name="Ghost",
    )
    controller._on_final_transcription(result)

    assert len(controller.transcriptions) == 0