"""
Tests for ProgressWidget UI component.
"""

import pytest

# Skip tests if PyQt6 is not installed
pytest.importorskip("PyQt6")

from datetime import datetime, timedelta
from unittest.mock import Mock

from PyQt6.QtWidgets import QApplication
from PyQt6.QtCore import Qt, QTimer
from PyQt6.QtTest import QTest

from src.ui.progress_widget import ProgressWidget, ChapterProgressItem
from src.scheduler.progress import ProgressNotifier
from src.scheduler.models import ChapterTask, PipelineProgress, TaskStatus, SchedulerState


@pytest.fixture
def app(qtbot):
    """Create QApplication fixture."""
    test_app = QApplication.instance()
    if test_app is None:
        test_app = QApplication([])
    yield test_app


@pytest.fixture
def progress_widget(app, qtbot):
    """Create ProgressWidget fixture."""
    widget = ProgressWidget()
    qtbot.addWidget(widget)
    yield widget
    widget.close()


@pytest.fixture
def sample_chapter_tasks():
    """Create sample chapter tasks for testing."""
    return [
        ChapterTask(
            chapter_id=f"ch_{i}",
            chapter_index=i,
            title=f"Chapter {i + 1}",
            original_content=f"Content for chapter {i + 1}\n",
        )
        for i in range(5)
    ]


class TestProgressWidget:
    """Test ProgressWidget functionality."""

    def test_initialization(self, progress_widget):
        """Test progress widget initializes correctly."""
        assert progress_widget._progress is None
        assert progress_widget._start_time is None
        assert len(progress_widget._chapter_items) == 0
        assert not progress_widget._eta_timer.isActive()

    def test_initial_ui_state(self, progress_widget):
        """Test initial UI state."""
        assert "No active translation" in progress_widget._stage_label.text()
        assert progress_widget._progress_bar.value() == 0
        assert progress_widget._completed_label.text() == "Completed: 0"
        assert progress_widget._failed_label.text() == "Failed: 0"
        assert progress_widget._remaining_label.text() == "Remaining: 0"

    def test_connect_to_notifier(self, progress_widget):
        """Test connecting to ProgressNotifier."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        assert notifier.observer_count == 1

    def test_disconnect_from_notifier(self, progress_widget):
        """Test disconnecting from ProgressNotifier."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)
        assert notifier.observer_count == 1

        progress_widget.disconnect_from_notifier(notifier)
        assert notifier.observer_count == 0

    def test_on_pipeline_start(self, progress_widget, sample_chapter_tasks):
        """Test pipeline start event."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        notifier.notify_pipeline_start(5)

        assert progress_widget._progress is not None
        assert progress_widget._progress.total_chapters == 5
        assert progress_widget._progress.state == SchedulerState.RUNNING
        assert progress_widget._start_time is not None
        assert progress_widget._eta_timer.isActive()

    def test_on_pipeline_complete(self, progress_widget):
        """Test pipeline complete event."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        # Start the pipeline
        notifier.notify_pipeline_start(5)

        # Complete the pipeline
        progress = PipelineProgress(
            total_chapters=5,
            completed_chapters=5,
            state=SchedulerState.COMPLETED
        )
        notifier.notify_pipeline_complete(progress)

        assert not progress_widget._eta_timer.isActive()
        assert progress_widget._progress_bar.value() == 100

    def test_on_pipeline_paused(self, progress_widget):
        """Test pipeline paused event."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        progress = PipelineProgress(
            total_chapters=5,
            completed_chapters=2,
            current_chapter=2,
            state=SchedulerState.PAUSED
        )
        notifier.notify_pipeline_paused(progress)

        assert "paused" in progress_widget._stage_label.text().lower()

    def test_on_pipeline_resumed(self, progress_widget):
        """Test pipeline resumed event."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        progress = PipelineProgress(
            total_chapters=5,
            completed_chapters=2,
            current_chapter=2,
            state=SchedulerState.RUNNING
        )
        notifier.notify_pipeline_resumed(progress)

        assert progress_widget._eta_timer.isActive()

    def test_on_chapter_start(self, progress_widget, sample_chapter_tasks):
        """Test chapter start event."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        notifier.notify_pipeline_start(5)
        notifier.notify_chapter_start(sample_chapter_tasks[0])

        assert len(progress_widget._chapter_items) == 1

    def test_on_chapter_complete(self, progress_widget, sample_chapter_tasks):
        """Test chapter complete event."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        notifier.notify_pipeline_start(5)

        # Mark task as completed
        task = sample_chapter_tasks[0]
        task.status = TaskStatus.COMPLETED
        notifier.notify_chapter_complete(task)

        assert progress_widget._progress.completed_chapters == 1

    def test_on_chapter_failed(self, progress_widget, sample_chapter_tasks):
        """Test chapter failed event."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        notifier.notify_pipeline_start(5)

        # Mark task as failed
        task = sample_chapter_tasks[0]
        task.status = TaskStatus.FAILED
        task.error_message = "Test error"
        notifier.notify_chapter_failed(task, "Test error")

        assert progress_widget._progress.failed_chapters == 1

    def test_multiple_chapters(self, progress_widget, sample_chapter_tasks):
        """Test handling multiple chapters."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        notifier.notify_pipeline_start(5)

        # Start and complete 3 chapters
        for i in range(3):
            task = sample_chapter_tasks[i]
            notifier.notify_chapter_start(task)
            task.status = TaskStatus.COMPLETED
            notifier.notify_chapter_complete(task)

        assert len(progress_widget._chapter_items) == 3
        assert progress_widget._progress.completed_chapters == 3

    def test_stats_update(self, progress_widget):
        """Test statistics display updates."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        notifier.notify_pipeline_start(10)

        progress = PipelineProgress(
            total_chapters=10,
            completed_chapters=5,
            failed_chapters=1,
            state=SchedulerState.RUNNING
        )
        progress_widget._progress = progress
        progress_widget._update_stats()

        assert progress_widget._completed_label.text() == "Completed: 5"
        assert progress_widget._failed_label.text() == "Failed: 1"
        assert progress_widget._remaining_label.text() == "Remaining: 4"

    def test_reset(self, progress_widget):
        """Test resetting the widget."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        # Start and add some chapters
        notifier.notify_pipeline_start(5)

        task = ChapterTask(
            chapter_id="ch_0",
            chapter_index=0,
            title="Chapter 1",
            original_content="Content\n"
        )
        notifier.notify_chapter_start(task)

        assert len(progress_widget._chapter_items) == 1

        # Reset
        progress_widget.reset()

        assert progress_widget._progress is None
        assert progress_widget._start_time is None
        assert len(progress_widget._chapter_items) == 0
        assert not progress_widget._eta_timer.isActive()

    def test_format_time(self, progress_widget):
        """Test time formatting."""
        # Seconds only
        assert progress_widget._format_time(45) == "00:45"

        # Minutes and seconds
        assert progress_widget._format_time(125) == "02:05"

        # Hours, minutes, seconds
        assert progress_widget._format_time(3661) == "01:01:01"


class TestChapterProgressItem:
    """Test ChapterProgressItem functionality."""

    def test_initialization(self, app):
        """Test chapter progress item initialization."""
        task = ChapterTask(
            chapter_id="ch_0",
            chapter_index=0,
            title="Chapter 1",
            original_content="Content\n"
        )

        item = ChapterProgressItem(task)

        assert item._task == task
        assert item._title_label.text() == "Chapter 1: Chapter 1"

    def test_status_icons(self, app):
        """Test status icons are correct."""
        task = ChapterTask(
            chapter_id="ch_0",
            chapter_index=0,
            title="Chapter 1",
            original_content="Content\n"
        )

        item = ChapterProgressItem(task)

        # Test different statuses
        for status, expected_icon in ChapterProgressItem.STATUS_ICONS.items():
            task.status = status
            item._update_style()
            assert item._icon_label.text() == expected_icon

    def test_update_task(self, app):
        """Test updating task in item."""
        task = ChapterTask(
            chapter_id="ch_0",
            chapter_index=0,
            title="Chapter 1",
            original_content="Content\n"
        )

        item = ChapterProgressItem(task)

        # Update task with completion
        task.status = TaskStatus.COMPLETED
        task.started_at = datetime.now()
        task.completed_at = datetime.now() + timedelta(seconds=10)

        item.update_task(task)

        assert item._task.status == TaskStatus.COMPLETED
        assert "Completed" in item._details_label.text()

    def test_failed_task_display(self, app):
        """Test failed task displays error message."""
        task = ChapterTask(
            chapter_id="ch_0",
            chapter_index=0,
            title="Chapter 1",
            original_content="Content\n",
            status=TaskStatus.FAILED,
            error_message="Translation failed: connection timeout"
        )

        item = ChapterProgressItem(task)

        assert "Failed" in item._details_label.text()
        assert "connection timeout" in item._details_label.text()

    def test_retrying_task_display(self, app):
        """Test retrying task displays retry count."""
        task = ChapterTask(
            chapter_id="ch_0",
            chapter_index=0,
            title="Chapter 1",
            original_content="Content\n",
            status=TaskStatus.RETRYING,
            retry_count=2
        )

        item = ChapterProgressItem(task)

        assert "Retrying" in item._details_label.text()
        assert "2/3" in item._details_label.text()


class TestProgressIntegration:
    """Test ProgressWidget integration with ProgressNotifier."""

    def test_full_workflow(self, progress_widget, sample_chapter_tasks):
        """Test complete translation workflow."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        # Start pipeline
        notifier.notify_pipeline_start(5)
        assert progress_widget._progress.total_chapters == 5

        # Process chapters
        for i, task in enumerate(sample_chapter_tasks):
            notifier.notify_chapter_start(task)

            # Simulate completion
            task.status = TaskStatus.COMPLETED
            task.started_at = datetime.now()
            task.completed_at = datetime.now() + timedelta(seconds=10)
            notifier.notify_chapter_complete(task)

        # Complete pipeline
        progress = progress_widget._progress
        notifier.notify_pipeline_complete(progress)

        assert progress_widget._progress_bar.value() == 100

    def test_error_recovery(self, progress_widget, sample_chapter_tasks):
        """Test error and recovery scenario."""
        notifier = ProgressNotifier()
        progress_widget.connect_to_notifier(notifier)

        # Start
        notifier.notify_pipeline_start(3)

        # First chapter succeeds
        notifier.notify_chapter_start(sample_chapter_tasks[0])
        sample_chapter_tasks[0].status = TaskStatus.COMPLETED
        notifier.notify_chapter_complete(sample_chapter_tasks[0])

        # Second chapter fails
        notifier.notify_chapter_start(sample_chapter_tasks[1])
        sample_chapter_tasks[1].status = TaskStatus.FAILED
        sample_chapter_tasks[1].error_message = "Network error"
        notifier.notify_chapter_failed(sample_chapter_tasks[1], "Network error")

        assert progress_widget._progress.completed_chapters == 1
        assert progress_widget._progress.failed_chapters == 1