"""
Integration tests for engine/app.py - pipeline orchestration.

Tests the main entry point and pipeline mode initialization.
"""

import sys
from unittest.mock import Mock, patch

import pytest

from engine.app import main, run_pipeline_mode
from engine.pipeline import get_preset


class TestMain:
    """Test main() entry point."""

    def test_main_calls_run_pipeline_mode_with_default_preset(self):
        """main() runs default preset (demo) when no args provided."""
        with patch("engine.app.run_pipeline_mode") as mock_run:
            sys.argv = ["mainline.py"]
            main()
            mock_run.assert_called_once_with("demo")

    def test_main_calls_run_pipeline_mode_with_config_preset(self):
        """main() uses PRESET from config if set."""
        with (
            patch("engine.app.config") as mock_config,
            patch("engine.app.run_pipeline_mode") as mock_run,
        ):
            mock_config.PIPELINE_DIAGRAM = False
            mock_config.PRESET = "gallery-sources"
            mock_config.PIPELINE_MODE = False
            sys.argv = ["mainline.py"]
            main()
            mock_run.assert_called_once_with("gallery-sources")

    def test_main_exits_on_unknown_preset(self):
        """main() exits with error for unknown preset."""
        with (
            patch("engine.app.config") as mock_config,
            patch("engine.app.list_presets", return_value=["demo", "poetry"]),
        ):
            mock_config.PIPELINE_DIAGRAM = False
            mock_config.PRESET = "nonexistent"
            mock_config.PIPELINE_MODE = False
            sys.argv = ["mainline.py"]
            with pytest.raises(SystemExit) as exc_info:
                main()
            assert exc_info.value.code == 1


class TestRunPipelineMode:
    """Test run_pipeline_mode() initialization."""

    def test_run_pipeline_mode_loads_valid_preset(self):
        """run_pipeline_mode() loads a valid preset."""
        preset = get_preset("demo")
        assert preset is not None
        assert preset.name == "demo"
        assert preset.source == "headlines"

    def test_run_pipeline_mode_exits_on_invalid_preset(self):
        """run_pipeline_mode() exits if preset not found."""
        with pytest.raises(SystemExit) as exc_info:
            run_pipeline_mode("invalid-preset-xyz")
        assert exc_info.value.code == 1

    def test_run_pipeline_mode_exits_when_no_content_available(self):
        """run_pipeline_mode() exits if no content can be fetched."""
        with (
            patch("engine.app.load_cache", return_value=None),
            patch("engine.app.fetch_all", return_value=([], None, None)),
            patch("engine.app.effects_plugins"),
            pytest.raises(SystemExit) as exc_info,
        ):
            run_pipeline_mode("demo")
        assert exc_info.value.code == 1

    def test_run_pipeline_mode_uses_cache_over_fetch(self):
        """run_pipeline_mode() uses cached content if available."""
        cached = ["cached_item"]
        with (
            patch("engine.app.load_cache", return_value=cached) as mock_load,
            patch("engine.app.fetch_all") as mock_fetch,
            patch("engine.app.DisplayRegistry.create") as mock_create,
        ):
            mock_display = Mock()
            mock_display.init = Mock()
            mock_display.get_dimensions = Mock(return_value=(80, 24))
            mock_display.is_quit_requested = Mock(return_value=True)
            mock_display.clear_quit_request = Mock()
            mock_display.show = Mock()
            mock_display.cleanup = Mock()
            mock_create.return_value = mock_display

            try:
                run_pipeline_mode("demo")
            except (KeyboardInterrupt, SystemExit):
                pass

            # Verify fetch_all was NOT called (cache was used)
            mock_fetch.assert_not_called()
            mock_load.assert_called_once()

    def test_run_pipeline_mode_creates_display(self):
        """run_pipeline_mode() creates a display backend."""
        with (
            patch("engine.app.load_cache", return_value=["item"]),
            patch("engine.app.DisplayRegistry.create") as mock_create,
        ):
            mock_display = Mock()
            mock_display.init = Mock()
            mock_display.get_dimensions = Mock(return_value=(80, 24))
            mock_display.is_quit_requested = Mock(return_value=True)
            mock_display.clear_quit_request = Mock()
            mock_display.show = Mock()
            mock_display.cleanup = Mock()
            mock_create.return_value = mock_display

            try:
                run_pipeline_mode("gallery-display-terminal")
            except (KeyboardInterrupt, SystemExit):
                pass

            # Verify display was created with 'terminal' (preset display)
            mock_create.assert_called_once_with("terminal")

    def test_run_pipeline_mode_respects_display_cli_flag(self):
        """run_pipeline_mode() uses --display CLI flag if provided."""
        sys.argv = ["mainline.py", "--display", "websocket"]

        with (
            patch("engine.app.load_cache", return_value=["item"]),
            patch("engine.app.DisplayRegistry.create") as mock_create,
        ):
            mock_display = Mock()
            mock_display.init = Mock()
            mock_display.get_dimensions = Mock(return_value=(80, 24))
            mock_display.is_quit_requested = Mock(return_value=True)
            mock_display.clear_quit_request = Mock()
            mock_display.show = Mock()
            mock_display.cleanup = Mock()
            mock_create.return_value = mock_display

            try:
                run_pipeline_mode("demo")
            except (KeyboardInterrupt, SystemExit):
                pass

            # Verify display was created with CLI override
            mock_create.assert_called_once_with("websocket")

    def test_run_pipeline_mode_fetches_poetry_for_poetry_source(self):
        """run_pipeline_mode() fetches poetry for poetry preset."""
        with (
            patch("engine.app.load_cache", return_value=None),
            patch(
                "engine.app.fetch_poetry", return_value=(["poem"], None, None)
            ) as mock_fetch_poetry,
            patch("engine.app.fetch_all") as mock_fetch_all,
            patch("engine.app.DisplayRegistry.create") as mock_create,
        ):
            mock_display = Mock()
            mock_display.init = Mock()
            mock_display.get_dimensions = Mock(return_value=(80, 24))
            mock_display.is_quit_requested = Mock(return_value=True)
            mock_display.clear_quit_request = Mock()
            mock_display.show = Mock()
            mock_display.cleanup = Mock()
            mock_create.return_value = mock_display

            try:
                run_pipeline_mode("poetry")
            except (KeyboardInterrupt, SystemExit):
                pass

            # Verify fetch_poetry was called, not fetch_all
            mock_fetch_poetry.assert_called_once()
            mock_fetch_all.assert_not_called()

    def test_run_pipeline_mode_discovers_effect_plugins(self):
        """run_pipeline_mode() discovers available effect plugins."""
        with (
            patch("engine.app.load_cache", return_value=["item"]),
            patch("engine.app.effects_plugins") as mock_effects,
            patch("engine.app.DisplayRegistry.create") as mock_create,
        ):
            mock_display = Mock()
            mock_display.init = Mock()
            mock_display.get_dimensions = Mock(return_value=(80, 24))
            mock_display.is_quit_requested = Mock(return_value=True)
            mock_display.clear_quit_request = Mock()
            mock_display.show = Mock()
            mock_display.cleanup = Mock()
            mock_create.return_value = mock_display

            try:
                run_pipeline_mode("demo")
            except (KeyboardInterrupt, SystemExit):
                pass

            # Verify effects_plugins.discover_plugins was called
            mock_effects.discover_plugins.assert_called_once()