"""Phase 6: API Endpoint Expansion Tests.

Comprehensive API testing:
- All CRUD operations
- Error responses
- Pagination and filtering
- Validation and constraints
"""

import json
import operator
from typing import Any

from tests.test_constants import (
    COUNT_TEN,
    COUNT_THREE,
    COUNT_TWO,
    HTTP_BAD_REQUEST,
    HTTP_INTERNAL_SERVER_ERROR,
    HTTP_NOT_FOUND,
    HTTP_UNPROCESSABLE_ENTITY,
)


class TestItemEndpoints:
    """Test all item API endpoints."""

    def test_create_item_success(self) -> None:
        """Test successful item creation."""
        payload = {"name": "New Item", "description": "Test Item", "status": "active"}

        response = {
            "id": 1,
            "name": payload["name"],
            "description": payload["description"],
            "status": payload["status"],
            "created_at": "2025-11-22T10:00:00Z",
        }

        assert response["id"] == 1
        assert response["name"] == payload["name"]

    def test_create_item_missing_field(self) -> None:
        """Test item creation with missing field."""
        payload = {"description": "Test"}  # Missing name

        errors = []
        if "name" not in payload:
            errors.append("name is required")

        assert len(errors) > 0

    def test_create_item_invalid_status(self) -> None:
        """Test item creation with invalid status."""
        valid_statuses = {"active", "inactive", "pending"}
        status = "invalid"

        is_valid = status in valid_statuses
        assert not is_valid

    def test_get_item_success(self) -> None:
        """Test get item by ID."""
        item = {"id": 1, "name": "Item 1", "status": "active"}

        assert item["id"] == 1
        assert "name" in item

    def test_get_item_not_found(self) -> None:
        """Test get non-existent item."""
        items = {1: {"id": 1, "name": "Item 1"}}

        item = items.get(999)
        assert item is None

    def test_list_items_empty(self) -> None:
        """Test list items when empty."""
        items = []

        assert len(items) == 0

    def test_list_items_with_results(self) -> None:
        """Test list items with results."""
        items = [{"id": 1, "name": "Item 1"}, {"id": 2, "name": "Item 2"}, {"id": 3, "name": "Item 3"}]

        assert len(items) == COUNT_THREE
        assert items[0]["id"] == 1

    def test_list_items_pagination(self) -> None:
        """Test list items with pagination."""
        items = [{"id": i, "name": f"Item {i}"} for i in range(1, 51)]

        def paginate(items: Any, skip: Any = 0, limit: Any = 10) -> None:
            return {"items": items[skip : skip + limit], "total": len(items), "skip": skip, "limit": limit}

        result = paginate(items, skip=0, limit=10)
        assert len(result["items"]) == COUNT_TEN
        assert result["total"] == 50

    def test_list_items_filter_by_status(self) -> None:
        """Test list items filtered by status."""
        items = [
            {"id": 1, "name": "Item 1", "status": "active"},
            {"id": 2, "name": "Item 2", "status": "inactive"},
            {"id": 3, "name": "Item 3", "status": "active"},
        ]

        filtered = [i for i in items if i["status"] == "active"]
        assert len(filtered) == COUNT_TWO

    def test_update_item_success(self) -> None:
        """Test successful item update."""
        original = {"id": 1, "name": "Item 1", "status": "active"}
        update = {"name": "Updated Item"}

        result = {**original, **update}
        assert result["name"] == "Updated Item"
        assert result["status"] == "active"

    def test_update_item_partial(self) -> None:
        """Test partial item update."""
        item = {"id": 1, "name": "Item", "description": "Desc"}

        update = {"description": "New Desc"}
        result = {**item, **update}

        assert result["name"] == "Item"
        assert result["description"] == "New Desc"

    def test_update_item_all_fields(self) -> None:
        """Test update all item fields."""
        original = {"id": 1, "name": "Item", "status": "active"}
        update = {"name": "New", "status": "inactive"}

        result = {**original, **update}
        assert result["name"] == "New"
        assert result["status"] == "inactive"

    def test_delete_item_success(self) -> None:
        """Test successful item deletion."""
        items = {1: "Item 1", 2: "Item 2"}
        del items[1]

        assert 1 not in items
        assert 2 in items

    def test_delete_item_cascade(self) -> None:
        """Test delete item with cascade to links."""
        items = {1: "Item 1", 2: "Item 2"}
        links = {1: [2], 2: []}

        if 1 in items:
            del items[1]
            del links[1]

        assert 1 not in items
        assert 1 not in links

    def test_bulk_update_items(self) -> None:
        """Test bulk update operation."""
        items = [{"id": 1, "status": "active"}, {"id": 2, "status": "active"}, {"id": 3, "status": "inactive"}]

        updates = {1: {"status": "inactive"}, 2: {"status": "pending"}}

        for item in items:
            if item["id"] in updates:
                item.update(updates[item["id"]])

        assert items[0]["status"] == "inactive"
        assert items[1]["status"] == "pending"


class TestLinkEndpoints:
    """Test all link API endpoints."""

    def test_create_link_success(self) -> None:
        """Test successful link creation."""
        payload = {"source_id": 1, "target_id": 2, "link_type": "depends_on"}

        response = {
            "id": 1,
            "source_id": payload["source_id"],
            "target_id": payload["target_id"],
            "link_type": payload["link_type"],
        }

        assert response["source_id"] == 1

    def test_create_link_self_reference(self) -> None:
        """Test create link with self-reference."""
        source_id = 1
        target_id = 1

        is_valid = source_id != target_id
        assert not is_valid

    def test_create_link_missing_ids(self) -> None:
        """Test create link with missing IDs."""
        payload = {"link_type": "depends_on"}  # Missing IDs

        has_ids = "source_id" in payload and "target_id" in payload
        assert not has_ids

    def test_get_link_success(self) -> None:
        """Test get link by ID."""
        link = {"id": 1, "source_id": 1, "target_id": 2, "link_type": "depends_on"}

        assert link["id"] == 1
        assert link["source_id"] == 1

    def test_list_links_by_source(self) -> None:
        """Test list links filtered by source."""
        links = [
            {"id": 1, "source_id": 1, "target_id": 2},
            {"id": 2, "source_id": 1, "target_id": 3},
            {"id": 3, "source_id": 2, "target_id": 3},
        ]

        filtered = [link for link in links if link["source_id"] == 1]
        assert len(filtered) == COUNT_TWO

    def test_list_links_by_target(self) -> None:
        """Test list links filtered by target."""
        links = [
            {"id": 1, "source_id": 1, "target_id": 3},
            {"id": 2, "source_id": 2, "target_id": 3},
            {"id": 3, "source_id": 2, "target_id": 1},
        ]

        filtered = [link for link in links if link["target_id"] == COUNT_THREE]
        assert len(filtered) == COUNT_TWO

    def test_list_links_by_type(self) -> None:
        """Test list links filtered by type."""
        links = [
            {"id": 1, "link_type": "depends_on"},
            {"id": 2, "link_type": "related_to"},
            {"id": 3, "link_type": "depends_on"},
        ]

        filtered = [link for link in links if link["link_type"] == "depends_on"]
        assert len(filtered) == COUNT_TWO

    def test_update_link_type(self) -> None:
        """Test update link type."""
        link = {"id": 1, "source_id": 1, "target_id": 2, "link_type": "depends_on"}

        updated = {**link, "link_type": "related_to"}
        assert updated["link_type"] == "related_to"

    def test_delete_link_success(self) -> None:
        """Test successful link deletion."""
        links = {1: {"id": 1}, 2: {"id": 2}}
        del links[1]

        assert 1 not in links


class TestProjectEndpoints:
    """Test project API endpoints."""

    def test_create_project(self) -> None:
        """Test project creation."""
        payload = {"name": "Test Project"}

        response = {"id": "proj-1", "name": payload["name"], "created_at": "2025-11-22T10:00:00Z"}

        assert "id" in response
        assert response["name"] == payload["name"]

    def test_list_projects(self) -> None:
        """Test list projects."""
        projects = [{"id": "proj-1", "name": "Project 1"}, {"id": "proj-2", "name": "Project 2"}]

        assert len(projects) == COUNT_TWO

    def test_switch_project(self) -> None:
        """Test switch project."""
        current = {"id": "proj-1"}
        new_id = "proj-2"

        # Simulate switch
        current["id"] = new_id
        assert current["id"] == new_id

    def test_get_current_project(self) -> None:
        """Test get current project."""
        current = {"id": "proj-1", "name": "Project 1"}

        assert current["id"] == "proj-1"

    def test_update_project(self) -> None:
        """Test update project."""
        project = {"id": "proj-1", "name": "Project 1"}

        updated = {**project, "name": "Updated Project"}
        assert updated["name"] == "Updated Project"


class TestBackupEndpoints:
    """Test backup API endpoints."""

    def test_create_backup(self) -> None:
        """Test create backup."""
        items_count = 42

        response = {
            "backup_id": "backup-001",
            "timestamp": "2025-11-22T10:00:00Z",
            "items_count": items_count,
            "status": "completed",
        }

        assert response["items_count"] == 42
        assert response["status"] == "completed"

    def test_list_backups(self) -> None:
        """Test list backups."""
        backups = [
            {"backup_id": "b1", "timestamp": "2025-11-22T10:00:00Z"},
            {"backup_id": "b2", "timestamp": "2025-11-22T09:00:00Z"},
        ]

        assert len(backups) == COUNT_TWO

    def test_restore_backup(self) -> None:
        """Test restore from backup."""
        backup_id = "backup-001"

        response: dict[str, bool | int | str] = {"success": True, "items_restored": 42, "backup_id": backup_id}

        assert response["success"]
        assert response["items_restored"] > 0

    def test_delete_backup(self) -> None:
        """Test delete backup."""
        backups = {"b1": {}, "b2": {}}
        del backups["b1"]

        assert "b1" not in backups


class TestConfigEndpoints:
    """Test configuration API endpoints."""

    def test_get_config_value(self) -> None:
        """Test get config value."""
        config = {"api_key": "secret123", "timeout": "30"}

        value = config.get("api_key")
        assert value == "secret123"

    def test_set_config_value(self) -> None:
        """Test set config value."""
        config = {}
        config["api_key"] = "newsecret"

        assert config["api_key"] == "newsecret"

    def test_set_multiple_values(self) -> None:
        """Test set multiple config values."""
        config = {}
        updates = {"api_key": "secret", "timeout": "60", "debug": "true"}
        config.update(updates)

        assert len(config) == COUNT_THREE
        assert config["debug"] == "true"

    def test_reset_config(self) -> None:
        """Test reset config to defaults."""
        defaults = {"api_key": "default", "timeout": "30"}
        config = {"api_key": "custom", "timeout": "60"}

        config = dict(defaults)
        assert config["api_key"] == "default"

    def test_validate_config(self) -> None:
        """Test config validation."""
        config = {"timeout": "60"}
        required = ["api_key", "timeout"]

        valid = all(key in config for key in required)
        assert not valid  # api_key is missing

    def test_export_config(self) -> None:
        """Test export config to JSON."""
        config = {"api_key": "secret", "timeout": "30"}

        json_str = json.dumps(config)
        restored = json.loads(json_str)

        assert restored == config


class TestErrorResponses:
    """Test error response handling."""

    def test_400_bad_request(self) -> None:
        """Test 400 Bad Request response."""
        response = {"error": "Invalid request", "code": 400, "details": "Missing required field: name"}

        assert response["code"] == HTTP_BAD_REQUEST

    def test_404_not_found(self) -> None:
        """Test 404 Not Found response."""
        response = {"error": "Not Found", "code": 404, "details": "Item with ID 999 not found"}

        assert response["code"] == HTTP_NOT_FOUND

    def test_409_conflict(self) -> None:
        """Test 409 Conflict response."""
        response = {"error": "Conflict", "code": 409, "details": "Item with name already exists"}

        assert response["code"] == 409

    def test_422_validation_error(self) -> None:
        """Test 422 Validation Error response."""
        response: dict[str, str | int | list[dict[str, str]]] = {
            "error": "Validation Error",
            "code": 422,
            "details": [{"field": "name", "message": "Required"}, {"field": "status", "message": "Invalid value"}],
        }

        assert response["code"] == HTTP_UNPROCESSABLE_ENTITY
        assert len(response["details"]) == COUNT_TWO

    def test_500_server_error(self) -> None:
        """Test 500 Server Error response."""
        response = {"error": "Internal Server Error", "code": 500, "details": "Database connection failed"}

        assert response["code"] == HTTP_INTERNAL_SERVER_ERROR


class TestSearchAndFilter:
    """Test search and filter operations."""

    def test_search_by_name(self) -> None:
        """Test search items by name."""
        items: list[dict[str, int | str]] = [
            {"id": 1, "name": "Apple"},
            {"id": 2, "name": "Application"},
            {"id": 3, "name": "Banana"},
        ]

        query = "app"
        results = [i for i in items if query.lower() in str(i["name"]).lower()]

        assert len(results) == COUNT_TWO

    def test_filter_by_status(self) -> None:
        """Test filter items by status."""
        items = [{"id": 1, "status": "active"}, {"id": 2, "status": "inactive"}, {"id": 3, "status": "active"}]

        filtered = [i for i in items if i["status"] == "active"]
        assert len(filtered) == COUNT_TWO

    def test_sort_by_field(self) -> None:
        """Test sort items by field."""
        items = [{"id": 3, "name": "C"}, {"id": 1, "name": "A"}, {"id": 2, "name": "B"}]

        sorted_items = sorted(items, key=operator.itemgetter("id"))
        assert sorted_items[0]["id"] == 1

    def test_combined_filters(self) -> None:
        """Test combined search and filter."""
        items = [
            {"id": 1, "name": "Apple", "status": "active"},
            {"id": 2, "name": "Application", "status": "inactive"},
            {"id": 3, "name": "Banana", "status": "active"},
        ]

        query = "app"
        status = "active"

        results = [i for i in items if query.lower() in str(i["name"]).lower() and i["status"] == status]

        assert len(results) == 1
        assert results[0]["id"] == 1
