"""
Tests for checkpoint system.
"""

import pytest
import tempfile
import os
from pathlib import Path

from src.core.checkpoint import (
    CheckpointManager, ShotCheckpoint, ProjectCheckpoint,
    ShotStatus, ProjectStatus
)


class TestCheckpointManager:
    """Test checkpoint management."""
    
    @pytest.fixture
    def temp_db(self):
        """Create a temporary database for testing."""
        with tempfile.NamedTemporaryFile(suffix='.db', delete=False) as f:
            db_path = f.name
        
        yield db_path
        
        # Cleanup
        if os.path.exists(db_path):
            os.unlink(db_path)
    
    @pytest.fixture
    def manager(self, temp_db):
        """Create a checkpoint manager with temp database."""
        return CheckpointManager(db_path=temp_db)
    
    def test_create_project(self, manager):
        """Test creating a project checkpoint."""
        checkpoint = manager.create_project(
            project_id="test_001",
            storyboard_path="/path/to/storyboard.json",
            output_dir="/path/to/output",
            backend_name="wan_t2v_14b"
        )
        
        assert checkpoint.project_id == "test_001"
        assert checkpoint.status == ProjectStatus.INITIALIZED
        assert checkpoint.backend_name == "wan_t2v_14b"
    
    def test_get_project(self, manager):
        """Test retrieving a project checkpoint."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/to/storyboard.json",
            output_dir="/path/to/output",
            backend_name="wan_t2v_14b"
        )
        
        retrieved = manager.get_project("test_001")
        assert retrieved is not None
        assert retrieved.project_id == "test_001"
        
        missing = manager.get_project("nonexistent")
        assert missing is None
    
    def test_update_project_status(self, manager):
        """Test updating project status."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/to/storyboard.json",
            output_dir="/path/to/output",
            backend_name="wan_t2v_14b"
        )
        
        manager.update_project_status("test_001", ProjectStatus.RUNNING)
        
        retrieved = manager.get_project("test_001")
        assert retrieved.status == ProjectStatus.RUNNING
    
    def test_create_shot(self, manager):
        """Test creating a shot checkpoint."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/storyboard.json",
            output_dir="/path/output",
            backend_name="wan"
        )
        
        shot = manager.create_shot("test_001", "S01", ShotStatus.PENDING)
        
        assert shot.shot_id == "S01"
        assert shot.status == ShotStatus.PENDING
    
    def test_update_shot(self, manager):
        """Test updating shot checkpoint."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/storyboard.json",
            output_dir="/path/output",
            backend_name="wan"
        )
        manager.create_shot("test_001", "S01")
        
        manager.update_shot(
            "test_001",
            "S01",
            status=ShotStatus.IN_PROGRESS,
            output_path="/path/output.mp4",
            metadata={"seed": 12345}
        )
        
        shot = manager.get_shot("test_001", "S01")
        assert shot.status == ShotStatus.IN_PROGRESS
        assert shot.output_path == "/path/output.mp4"
        assert shot.metadata["seed"] == 12345
    
    def test_get_pending_shots(self, manager):
        """Test retrieving pending shots."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/storyboard.json",
            output_dir="/path/output",
            backend_name="wan"
        )
        
        manager.create_shot("test_001", "S01", ShotStatus.PENDING)
        manager.create_shot("test_001", "S02", ShotStatus.COMPLETED)
        manager.create_shot("test_001", "S03", ShotStatus.PENDING)
        
        pending = manager.get_pending_shots("test_001")
        assert len(pending) == 2
        assert "S01" in pending
        assert "S03" in pending
    
    def test_can_resume(self, manager):
        """Test checking if project can be resumed."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/storyboard.json",
            output_dir="/path/output",
            backend_name="wan"
        )
        
        # No shots yet - can't resume
        assert not manager.can_resume("test_001")
        
        # Add pending shot - can resume
        manager.create_shot("test_001", "S01", ShotStatus.PENDING)
        assert manager.can_resume("test_001")
        
        # Complete all shots - can't resume
        manager.update_shot("test_001", "S01", status=ShotStatus.COMPLETED)
        assert not manager.can_resume("test_001")
    
    def test_delete_project(self, manager):
        """Test deleting a project."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/storyboard.json",
            output_dir="/path/output",
            backend_name="wan"
        )
        manager.create_shot("test_001", "S01")
        
        manager.delete_project("test_001")
        
        assert manager.get_project("test_001") is None
        assert manager.get_shot("test_001", "S01") is None
    
    def test_list_projects(self, manager):
        """Test listing all projects."""
        manager.create_project(
            project_id="test_001",
            storyboard_path="/path/1.json",
            output_dir="/out/1",
            backend_name="wan"
        )
        manager.create_project(
            project_id="test_002",
            storyboard_path="/path/2.json",
            output_dir="/out/2",
            backend_name="svd"
        )
        
        projects = manager.list_projects()
        assert len(projects) == 2
        
        project_ids = [p.project_id for p in projects]
        assert "test_001" in project_ids
        assert "test_002" in project_ids