from __future__ import annotations

from pathlib import Path

import pytest
from PySide6.QtWidgets import QComboBox, QLineEdit, QMessageBox

from voice_transcriptor.models import AppSettings
from voice_transcriptor.services.credentials import CredentialError
from voice_transcriptor.services.settings import SettingsError
from voice_transcriptor.services.settings import SUPPORTED_MODEL_SUGGESTIONS
from voice_transcriptor.ui.settings_dialog import SettingsDialog


class FakeRepository:
    def __init__(self) -> None:
        self.saved: list[AppSettings] = []

    def save(self, settings: AppSettings) -> None:
        self.saved.append(settings)


class FakeCredentials:
    def __init__(self, api_key: str | None = None) -> None:
        self.api_key = api_key
        self.saved_values: list[str] = []

    def get_api_key(self) -> str | None:
        return self.api_key

    def has_api_key(self) -> bool:
        return bool(self.api_key)

    def set_api_key(self, value: str) -> None:
        self.saved_values.append(value)
        self.api_key = value


@pytest.fixture
def settings(tmp_path: Path) -> AppSettings:
    output_directory = tmp_path / "output"
    output_directory.mkdir()
    return AppSettings("gpt-4o-transcribe", "pt-BR", output_directory)


def test_populates_fields_from_settings(qtbot, settings: AppSettings) -> None:
    dialog = SettingsDialog(settings, FakeRepository(), FakeCredentials())
    qtbot.addWidget(dialog)

    assert dialog.model_input.text() == settings.model
    assert dialog.language_input.text() == settings.language
    assert dialog.output_directory_input.text() == str(settings.output_directory)
    assert dialog.api_key_input.text() == ""
    assert dialog.advanced_panel.isVisible() is False
    assert dialog.chunk_duration_input.value() == 900
    assert dialog.chunk_overlap_input.value() == 15
    assert isinstance(dialog.model_input, QComboBox)
    assert dialog.model_input.isEditable()
    assert tuple(dialog.model_input.itemText(i) for i in range(dialog.model_input.count())) == SUPPORTED_MODEL_SUGGESTIONS
    assert dialog.context_input.toPlainText() == settings.context_vocabulary


def test_advanced_settings_are_saved(qtbot, settings: AppSettings) -> None:
    repository = FakeRepository()
    dialog = SettingsDialog(settings, repository, FakeCredentials())
    qtbot.addWidget(dialog)
    dialog.chunk_duration_input.setValue(1200)
    dialog.chunk_overlap_input.setValue(20)
    dialog.retain_temporary_files_input.setChecked(True)
    dialog.save()
    assert repository.saved[0].chunk_duration_seconds == 1200
    assert repository.saved[0].chunk_overlap_seconds == 20
    assert repository.saved[0].retain_temporary_files is True


def test_api_key_input_uses_password_echo_mode(qtbot, settings: AppSettings) -> None:
    dialog = SettingsDialog(settings, FakeRepository(), FakeCredentials())
    qtbot.addWidget(dialog)

    assert dialog.api_key_input.echoMode() is QLineEdit.EchoMode.Password


def test_blank_api_key_preserves_existing_credential(qtbot, settings: AppSettings) -> None:
    credentials = FakeCredentials(api_key="stored-token")
    repository = FakeRepository()
    dialog = SettingsDialog(settings, repository, credentials)
    qtbot.addWidget(dialog)

    dialog.save()

    assert credentials.api_key == "stored-token"
    assert credentials.saved_values == []
    assert repository.saved == [settings]


def test_save_persists_new_api_key_and_emits_saved_settings(qtbot, settings: AppSettings) -> None:
    credentials = FakeCredentials()
    repository = FakeRepository()
    dialog = SettingsDialog(settings, repository, credentials)
    qtbot.addWidget(dialog)
    saved_with = qtbot.waitSignal(dialog.settings_saved)
    supplied_key = "test-token-for-dialog"

    dialog.api_key_input.setText(supplied_key)
    dialog.model_input.setText("gpt-4o-mini-transcribe")
    dialog.context_input.setPlainText("Pix, Banco do Brasil")
    dialog.save()

    assert saved_with.args == [
        AppSettings("gpt-4o-mini-transcribe", "pt-BR", settings.output_directory, context_vocabulary="Pix, Banco do Brasil")
    ]
    assert credentials.api_key == supplied_key
    assert repository.saved == saved_with.args


def test_save_rejects_nonexistent_output_directory(qtbot, settings: AppSettings, tmp_path: Path) -> None:
    repository = FakeRepository()
    dialog = SettingsDialog(settings, repository, FakeCredentials())
    qtbot.addWidget(dialog)
    warnings: list[tuple[str, str]] = []
    monkeypatch = pytest.MonkeyPatch()
    monkeypatch.setattr(
        QMessageBox,
        "warning",
        lambda parent, title, text: warnings.append((title, text)),
    )
    try:
        dialog.output_directory_input.setText(str(tmp_path / "missing"))
        dialog.save()
    finally:
        monkeypatch.undo()

    assert repository.saved == []
    assert warnings == [("Invalid output directory", "Choose an accessible output directory.")]
    assert dialog.isVisible() is False


def test_save_clears_key_field_and_never_writes_key_to_widgets(qtbot, settings: AppSettings) -> None:
    dialog = SettingsDialog(settings, FakeRepository(), FakeCredentials())
    qtbot.addWidget(dialog)
    supplied_key = "test-token-for-dialog"

    dialog.api_key_input.setText(supplied_key)
    dialog.save()

    assert dialog.api_key_input.text() == ""
    assert all(supplied_key not in widget.text() for widget in dialog.findChildren(QLineEdit))


def test_service_failures_show_sanitized_message_and_keep_dialog_usable(
    qtbot, settings: AppSettings, monkeypatch
) -> None:
    class FailingCredentials(FakeCredentials):
        def set_api_key(self, value: str) -> None:
            raise CredentialError("backend detail must not be shown")

    dialog = SettingsDialog(settings, FakeRepository(), FailingCredentials())
    qtbot.addWidget(dialog)
    warnings: list[tuple[str, str]] = []
    monkeypatch.setattr(
        QMessageBox,
        "warning",
        lambda parent, title, text: warnings.append((title, text)),
    )

    dialog.api_key_input.setText("test-token-for-dialog")
    dialog.save()

    assert warnings == [("Could not save settings", "The API key could not be saved.")]
    assert dialog.result() == 0
    assert dialog.api_key_input.text() == ""


def test_settings_repository_failure_is_sanitized(qtbot, settings: AppSettings, monkeypatch) -> None:
    class FailingRepository(FakeRepository):
        def save(self, settings: AppSettings) -> None:
            raise SettingsError("filesystem detail must not be shown")

    dialog = SettingsDialog(settings, FailingRepository(), FakeCredentials())
    qtbot.addWidget(dialog)
    warnings: list[tuple[str, str]] = []
    monkeypatch.setattr(
        QMessageBox,
        "warning",
        lambda parent, title, text: warnings.append((title, text)),
    )

    dialog.save()

    assert warnings == [("Could not save settings", "Settings could not be saved.")]
    assert dialog.result() == 0