"""Tests for PersistentRecipeCache."""

import json
import os
import tempfile
from typing import Dict, List

import pytest

from py.services.persistent_recipe_cache import PersistentRecipeCache, PersistedRecipeData


@pytest.fixture
def temp_db_path():
    """Create a temporary database path."""
    with tempfile.NamedTemporaryFile(suffix=".sqlite", delete=False) as f:
        path = f.name
    yield path
    # Cleanup
    if os.path.exists(path):
        os.unlink(path)
    # Also clean up WAL files
    for suffix in ["-wal", "-shm"]:
        wal_path = path + suffix
        if os.path.exists(wal_path):
            os.unlink(wal_path)


@pytest.fixture
def sample_recipes() -> List[Dict]:
    """Create sample recipe data."""
    return [
        {
            "id": "recipe-001",
            "file_path": "/path/to/image1.png",
            "title": "Test Recipe 1",
            "folder": "folder1",
            "base_model": "SD1.5",
            "fingerprint": "abc123",
            "created_date": 1700000000.0,
            "modified": 1700000100.0,
            "favorite": True,
            "repair_version": 3,
            "preview_nsfw_level": 1,
            "loras": [
                {"hash": "hash1", "file_name": "lora1", "strength": 0.8},
                {"hash": "hash2", "file_name": "lora2", "strength": 1.0},
            ],
            "checkpoint": {"name": "model.safetensors", "hash": "cphash"},
            "gen_params": {"prompt": "test prompt", "negative_prompt": "bad"},
            "tags": ["tag1", "tag2"],
        },
        {
            "id": "recipe-002",
            "file_path": "/path/to/image2.png",
            "title": "Test Recipe 2",
            "folder": "",
            "base_model": "SDXL",
            "fingerprint": "def456",
            "created_date": 1700000200.0,
            "modified": 1700000300.0,
            "favorite": False,
            "repair_version": 2,
            "preview_nsfw_level": 0,
            "loras": [{"hash": "hash3", "file_name": "lora3", "strength": 0.5}],
            "gen_params": {"prompt": "another prompt"},
            "tags": [],
        },
    ]


class TestPersistentRecipeCache:
    """Tests for PersistentRecipeCache class."""

    def test_init_creates_db(self, temp_db_path):
        """Test that initialization creates the database."""
        cache = PersistentRecipeCache(db_path=temp_db_path)
        assert cache.is_enabled()
        assert os.path.exists(temp_db_path)

    def test_save_and_load_roundtrip(self, temp_db_path, sample_recipes):
        """Test save and load cycle preserves data."""
        cache = PersistentRecipeCache(db_path=temp_db_path)

        # Save recipes
        json_paths = {
            "recipe-001": "/path/to/recipe-001.recipe.json",
            "recipe-002": "/path/to/recipe-002.recipe.json",
        }
        cache.save_cache(sample_recipes, json_paths)

        # Load recipes
        loaded = cache.load_cache()
        assert loaded is not None
        assert len(loaded.raw_data) == 2

        # Verify first recipe
        r1 = next(r for r in loaded.raw_data if r["id"] == "recipe-001")
        assert r1["title"] == "Test Recipe 1"
        assert r1["folder"] == "folder1"
        assert r1["base_model"] == "SD1.5"
        assert r1["fingerprint"] == "abc123"
        assert r1["favorite"] is True
        assert r1["repair_version"] == 3
        assert len(r1["loras"]) == 2
        assert r1["loras"][0]["hash"] == "hash1"
        assert r1["checkpoint"]["name"] == "model.safetensors"
        assert r1["gen_params"]["prompt"] == "test prompt"
        assert r1["tags"] == ["tag1", "tag2"]

        # Verify second recipe
        r2 = next(r for r in loaded.raw_data if r["id"] == "recipe-002")
        assert r2["title"] == "Test Recipe 2"
        assert r2["folder"] == ""
        assert r2["favorite"] is False

    def test_empty_cache_returns_none(self, temp_db_path):
        """Test that loading empty cache returns None."""
        cache = PersistentRecipeCache(db_path=temp_db_path)
        loaded = cache.load_cache()
        assert loaded is None

    def test_update_single_recipe(self, temp_db_path, sample_recipes):
        """Test updating a single recipe."""
        cache = PersistentRecipeCache(db_path=temp_db_path)
        cache.save_cache(sample_recipes)

        # Update a recipe
        updated_recipe = dict(sample_recipes[0])
        updated_recipe["title"] = "Updated Title"
        updated_recipe["favorite"] = False
        cache.update_recipe(updated_recipe, "/path/to/recipe-001.recipe.json")

        # Load and verify
        loaded = cache.load_cache()
        r1 = next(r for r in loaded.raw_data if r["id"] == "recipe-001")
        assert r1["title"] == "Updated Title"
        assert r1["favorite"] is False

    def test_remove_recipe(self, temp_db_path, sample_recipes):
        """Test removing a recipe."""
        cache = PersistentRecipeCache(db_path=temp_db_path)
        cache.save_cache(sample_recipes)

        # Remove a recipe
        cache.remove_recipe("recipe-001")

        # Load and verify
        loaded = cache.load_cache()
        assert len(loaded.raw_data) == 1
        assert loaded.raw_data[0]["id"] == "recipe-002"

    def test_get_indexed_recipe_ids(self, temp_db_path, sample_recipes):
        """Test getting all indexed recipe IDs."""
        cache = PersistentRecipeCache(db_path=temp_db_path)
        cache.save_cache(sample_recipes)

        ids = cache.get_indexed_recipe_ids()
        assert ids == {"recipe-001", "recipe-002"}

    def test_get_recipe_count(self, temp_db_path, sample_recipes):
        """Test getting recipe count."""
        cache = PersistentRecipeCache(db_path=temp_db_path)
        assert cache.get_recipe_count() == 0

        cache.save_cache(sample_recipes)
        assert cache.get_recipe_count() == 2

        cache.remove_recipe("recipe-001")
        assert cache.get_recipe_count() == 1

    def test_file_stats(self, temp_db_path, sample_recipes):
        """Test file stats tracking."""
        cache = PersistentRecipeCache(db_path=temp_db_path)

        json_paths = {
            "recipe-001": "/path/to/recipe-001.recipe.json",
            "recipe-002": "/path/to/recipe-002.recipe.json",
        }
        cache.save_cache(sample_recipes, json_paths)

        stats = cache.get_file_stats()
        # File stats will be (0.0, 0) since files don't exist
        assert len(stats) == 2

    def test_disabled_cache(self, temp_db_path, sample_recipes, monkeypatch):
        """Test that disabled cache returns None."""
        monkeypatch.setenv("LORA_MANAGER_DISABLE_PERSISTENT_CACHE", "1")

        cache = PersistentRecipeCache(db_path=temp_db_path)
        assert not cache.is_enabled()
        cache.save_cache(sample_recipes)
        assert cache.load_cache() is None

    def test_invalid_recipe_skipped(self, temp_db_path):
        """Test that recipes without ID are skipped."""
        cache = PersistentRecipeCache(db_path=temp_db_path)

        recipes = [
            {"title": "No ID recipe"},  # Missing ID
            {"id": "valid-001", "title": "Valid recipe"},
        ]
        cache.save_cache(recipes)

        loaded = cache.load_cache()
        assert len(loaded.raw_data) == 1
        assert loaded.raw_data[0]["id"] == "valid-001"

    def test_get_default_singleton(self, monkeypatch):
        """Test singleton behavior."""
        # Use temp directory
        with tempfile.TemporaryDirectory() as tmpdir:
            monkeypatch.setenv("LORA_MANAGER_RECIPE_CACHE_DB", os.path.join(tmpdir, "test.sqlite"))

            PersistentRecipeCache.clear_instances()
            cache1 = PersistentRecipeCache.get_default("test_lib")
            cache2 = PersistentRecipeCache.get_default("test_lib")
            assert cache1 is cache2

            cache3 = PersistentRecipeCache.get_default("other_lib")
            assert cache1 is not cache3

            PersistentRecipeCache.clear_instances()

    def test_loras_json_handling(self, temp_db_path):
        """Test that complex loras data is preserved."""
        cache = PersistentRecipeCache(db_path=temp_db_path)

        recipes = [
            {
                "id": "complex-001",
                "title": "Complex Loras",
                "loras": [
                    {
                        "hash": "abc123",
                        "file_name": "test_lora",
                        "strength": 0.75,
                        "modelVersionId": 12345,
                        "modelName": "Test Model",
                        "isDeleted": False,
                    },
                    {
                        "hash": "def456",
                        "file_name": "another_lora",
                        "strength": 1.0,
                        "clip_strength": 0.8,
                    },
                ],
            }
        ]
        cache.save_cache(recipes)

        loaded = cache.load_cache()
        loras = loaded.raw_data[0]["loras"]
        assert len(loras) == 2
        assert loras[0]["modelVersionId"] == 12345
        assert loras[1]["clip_strength"] == 0.8

    # =============================================================================
    # Tests for concurrent access (from Phase 2 improvement plan)
    # =============================================================================

    def test_concurrent_reads_do_not_corrupt_data(self, temp_db_path, sample_recipes):
        """Verify concurrent reads don't corrupt database state."""
        import threading
        import time

        cache = PersistentRecipeCache(db_path=temp_db_path)
        cache.save_cache(sample_recipes)

        results = []
        errors = []

        def read_operation():
            try:
                for _ in range(10):
                    loaded = cache.load_cache()
                    if loaded is not None:
                        results.append(len(loaded.raw_data))
                    time.sleep(0.01)
            except Exception as e:
                errors.append(str(e))

        # Start multiple reader threads
        threads = [threading.Thread(target=read_operation) for _ in range(5)]
        for t in threads:
            t.start()
        for t in threads:
            t.join()

        # No errors should occur
        assert len(errors) == 0, f"Errors during concurrent reads: {errors}"
        # All reads should return consistent data
        assert all(count == 2 for count in results), "Inconsistent read results"

    def test_concurrent_write_and_read(self, temp_db_path, sample_recipes):
        """Verify thread safety under concurrent writes and reads."""
        import threading
        import time

        cache = PersistentRecipeCache(db_path=temp_db_path)
        cache.save_cache(sample_recipes)

        write_errors = []
        read_errors = []
        write_count = [0]

        def write_operation():
            try:
                for i in range(5):
                    recipe = {
                        "id": f"concurrent-{i}",
                        "title": f"Concurrent Recipe {i}",
                    }
                    cache.update_recipe(recipe)
                    write_count[0] += 1
                    time.sleep(0.02)
            except Exception as e:
                write_errors.append(str(e))

        def read_operation():
            try:
                for _ in range(10):
                    cache.load_cache()
                    cache.get_recipe_count()
                    time.sleep(0.01)
            except Exception as e:
                read_errors.append(str(e))

        # Mix of read and write threads
        threads = (
            [threading.Thread(target=write_operation) for _ in range(2)]
            + [threading.Thread(target=read_operation) for _ in range(3)]
        )

        for t in threads:
            t.start()
        for t in threads:
            t.join()

        # No errors should occur
        assert len(write_errors) == 0, f"Write errors: {write_errors}"
        assert len(read_errors) == 0, f"Read errors: {read_errors}"
        # Writes should complete successfully
        assert write_count[0] > 0

    def test_concurrent_updates_to_same_recipe(self, temp_db_path):
        """Verify concurrent updates to the same recipe don't corrupt data."""
        import threading

        cache = PersistentRecipeCache(db_path=temp_db_path)

        # Initialize with one recipe
        initial_recipe = {
            "id": "concurrent-update",
            "title": "Initial Title",
            "version": 1,
        }
        cache.save_cache([initial_recipe])

        errors = []
        successful_updates = []

        def update_operation(thread_id):
            try:
                for i in range(5):
                    recipe = {
                        "id": "concurrent-update",
                        "title": f"Title from thread {thread_id} update {i}",
                        "version": i + 1,
                    }
                    cache.update_recipe(recipe)
                    successful_updates.append((thread_id, i))
            except Exception as e:
                errors.append(f"Thread {thread_id}: {e}")

        # Multiple threads updating the same recipe
        threads = [
            threading.Thread(target=update_operation, args=(i,)) for i in range(3)
        ]
        for t in threads:
            t.start()
        for t in threads:
            t.join()

        # No errors should occur
        assert len(errors) == 0, f"Update errors: {errors}"
        # All updates should complete
        assert len(successful_updates) == 15

        # Final state should be valid
        final_count = cache.get_recipe_count()
        assert final_count == 1

    def test_schema_initialization_thread_safety(self, temp_db_path):
        """Verify schema initialization is thread-safe."""
        import threading

        errors = []
        initialized_caches = []

        def create_cache():
            try:
                cache = PersistentRecipeCache(db_path=temp_db_path)
                initialized_caches.append(cache)
            except Exception as e:
                errors.append(str(e))

        # Multiple threads creating cache simultaneously
        threads = [threading.Thread(target=create_cache) for _ in range(5)]
        for t in threads:
            t.start()
        for t in threads:
            t.join()

        # No errors should occur
        assert len(errors) == 0, f"Initialization errors: {errors}"
        # All caches should be created
        assert len(initialized_caches) == 5

    def test_concurrent_save_and_remove(self, temp_db_path, sample_recipes):
        """Verify concurrent save and remove operations don't corrupt database."""
        import threading
        import time

        cache = PersistentRecipeCache(db_path=temp_db_path)

        errors = []
        operation_counts = {"saves": 0, "removes": 0}

        def save_operation():
            try:
                for i in range(5):
                    recipes = [
                        {"id": f"recipe-{j}", "title": f"Recipe {j}"}
                        for j in range(i * 2, i * 2 + 2)
                    ]
                    cache.save_cache(recipes)
                    operation_counts["saves"] += 1
                    time.sleep(0.015)
            except Exception as e:
                errors.append(f"Save error: {e}")

        def remove_operation():
            try:
                for i in range(5):
                    cache.remove_recipe(f"recipe-{i}")
                    operation_counts["removes"] += 1
                    time.sleep(0.02)
            except Exception as e:
                errors.append(f"Remove error: {e}")

        # Concurrent save and remove threads
        threads = [
            threading.Thread(target=save_operation),
            threading.Thread(target=remove_operation),
        ]
        for t in threads:
            t.start()
        for t in threads:
            t.join()

        # No errors should occur
        assert len(errors) == 0, f"Operation errors: {errors}"
        # Operations should complete
        assert operation_counts["saves"] == 5
        assert operation_counts["removes"] == 5