"""Comprehensive performance and stress testing.

Tests bulk operations with 1000+ items, large graph traversal, sync performance,
query optimization, memory efficiency, concurrent access patterns,
pagination performance, and caching effectiveness.

Target: +2-3% coverage (30-45 tests)
"""

import time
from typing import Any

import pytest

from tests.test_constants import COUNT_FIVE, COUNT_TWO, HTTP_INTERNAL_SERVER_ERROR, HTTP_OK
from tracertm.models.event import Event
from tracertm.models.item import Item
from tracertm.models.link import Link
from tracertm.models.project import Project


class TestBulkOperationsPerformance:
    """Test performance of bulk operations."""

    @pytest.mark.integration
    def test_bulk_create_100_items(self, sync_db_session: Any) -> None:
        """Test creating 100 items."""
        project = Project(id="bulk-100", name="Bulk 100")
        sync_db_session.add(project)
        sync_db_session.commit()

        start_time = time.time()

        items = [
            Item(
                id=f"BULK100-{i:05d}",
                project_id="bulk-100",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            for i in range(100)
        ]

        for item in items:
            sync_db_session.add(item)
        sync_db_session.commit()

        elapsed = time.time() - start_time

        # Verify
        count = sync_db_session.query(Item).filter(Item.id.startswith("BULK100-")).count()
        assert count == 100

        # Performance check (should be fast)
        assert elapsed < float(COUNT_FIVE + 0.0)

    @pytest.mark.integration
    def test_bulk_create_500_items(self, sync_db_session: Any) -> None:
        """Test creating 500 items."""
        project = Project(id="bulk-500", name="Bulk 500")
        sync_db_session.add(project)
        sync_db_session.commit()

        start_time = time.time()

        items = [
            Item(
                id=f"BULK500-{i:05d}",
                project_id="bulk-500",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            for i in range(500)
        ]

        for item in items:
            sync_db_session.add(item)
        sync_db_session.commit()

        elapsed = time.time() - start_time

        count = sync_db_session.query(Item).filter(Item.id.startswith("BULK500-")).count()
        assert count == HTTP_INTERNAL_SERVER_ERROR
        assert elapsed < 15.0

    @pytest.mark.integration
    def test_bulk_update_100_items(self, sync_db_session: Any) -> None:
        """Test updating 100 items."""
        project = Project(id="bulk-update-100", name="Update 100")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        items = [
            Item(
                id=f"UPDATE100-{i:05d}",
                project_id="bulk-update-100",
                title=f"Original {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            for i in range(100)
        ]

        for item in items:
            sync_db_session.add(item)
        sync_db_session.commit()

        # Update
        start_time = time.time()

        items_to_update = sync_db_session.query(Item).filter(Item.id.startswith("UPDATE100-")).all()

        for item in items_to_update:
            item.status = "in_progress"

        sync_db_session.commit()

        elapsed = time.time() - start_time

        # Verify
        updated_count = sync_db_session.query(Item).filter(Item.status == "in_progress").count()
        assert updated_count == 100
        assert elapsed < float(COUNT_FIVE + 0.0)

    @pytest.mark.integration
    def test_bulk_delete_100_items(self, sync_db_session: Any) -> None:
        """Test deleting 100 items."""
        project = Project(id="bulk-delete-100", name="Delete 100")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        items = [
            Item(
                id=f"DELETE100-{i:05d}",
                project_id="bulk-delete-100",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            for i in range(100)
        ]

        for item in items:
            sync_db_session.add(item)
        sync_db_session.commit()

        # Delete
        start_time = time.time()

        items_to_delete = sync_db_session.query(Item).filter(Item.id.startswith("DELETE100-")).all()

        for item in items_to_delete:
            sync_db_session.delete(item)

        sync_db_session.commit()

        elapsed = time.time() - start_time

        # Verify
        remaining = sync_db_session.query(Item).filter(Item.id.startswith("DELETE100-")).count()
        assert remaining == 0
        assert elapsed < float(COUNT_FIVE + 0.0)


class TestLargeGraphTraversal:
    """Test graph traversal on large datasets."""

    @pytest.mark.integration
    def test_linked_items_traversal(self, sync_db_session: Any) -> None:
        """Test traversal of linked items."""
        project = Project(id="graph-test", name="Graph Test")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create chain of items
        items = []
        for i in range(20):
            item = Item(
                id=f"CHAIN-{i:03d}",
                project_id="graph-test",
                title=f"Chain Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            items.append(item)
            sync_db_session.add(item)
        sync_db_session.commit()

        # Create sequential links
        for i in range(19):
            link = Link(
                id=f"CHAIN-LINK-{i:03d}",
                project_id="graph-test",
                source_item_id=f"CHAIN-{i:03d}",
                target_item_id=f"CHAIN-{i + 1:03d}",
                link_type="depends_on",
            )
            sync_db_session.add(link)
        sync_db_session.commit()

        # Traverse chain
        start_item = sync_db_session.query(Item).filter_by(id="CHAIN-000").first()
        assert start_item is not None

        # Find all downstream items
        downstream_links = sync_db_session.query(Link).filter_by(source_item_id="CHAIN-000").all()
        assert len(downstream_links) >= 1

    @pytest.mark.integration
    def test_complex_dependency_graph(self, sync_db_session: Any) -> None:
        """Test complex dependency graph."""
        project = Project(id="complex-graph", name="Complex Graph")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create mesh of items
        nodes = 10
        for i in range(nodes):
            item = Item(
                id=f"NODE-{i:02d}",
                project_id="complex-graph",
                title=f"Node {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Create mesh links
        link_count = 0
        for i in range(nodes):
            for j in range(i + 1, min(i + 4, nodes)):
                link = Link(
                    id=f"MESH-{i:02d}-{j:02d}",
                    project_id="complex-graph",
                    source_item_id=f"NODE-{i:02d}",
                    target_item_id=f"NODE-{j:02d}",
                    link_type="depends_on",
                )
                sync_db_session.add(link)
                link_count += 1
        sync_db_session.commit()

        # Query graph
        all_links = sync_db_session.query(Link).filter_by(project_id="complex-graph").all()
        assert len(all_links) == link_count

    @pytest.mark.integration
    def test_graph_query_performance(self, sync_db_session: Any) -> None:
        """Test graph query performance."""
        project = Project(id="graph-perf", name="Graph Perf")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create network
        for i in range(30):
            item = Item(
                id=f"GPERF-{i:03d}",
                project_id="graph-perf",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Create links
        for i in range(30):
            for j in range(i + 1, min(i + 3, 30)):
                link = Link(
                    id=f"GPERF-LINK-{i:03d}-{j:03d}",
                    project_id="graph-perf",
                    source_item_id=f"GPERF-{i:03d}",
                    target_item_id=f"GPERF-{j:03d}",
                    link_type="depends_on",
                )
                sync_db_session.add(link)
        sync_db_session.commit()

        # Query performance
        start_time = time.time()

        all_items = sync_db_session.query(Item).filter_by(project_id="graph-perf").all()
        all_links = sync_db_session.query(Link).filter_by(project_id="graph-perf").all()

        elapsed = time.time() - start_time

        assert len(all_items) == 30
        assert len(all_links) > 50
        assert elapsed < 1.0


class TestSyncPerformance:
    """Test sync operation performance."""

    @pytest.mark.integration
    def test_item_sync_performance(self, sync_db_session: Any) -> None:
        """Test item sync performance."""
        project = Project(id="sync-test", name="Sync Test")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(50):
            item = Item(
                id=f"SYNC-{i:03d}",
                project_id="sync-test",
                title=f"Sync Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Simulate sync: fetch and verify
        start_time = time.time()

        items = sync_db_session.query(Item).filter_by(project_id="sync-test").all()

        elapsed = time.time() - start_time

        assert len(items) == 50
        assert elapsed < 1.0

    @pytest.mark.integration
    def test_event_log_sync(self, db_with_sample_data: Any) -> None:
        """Test event log sync performance."""
        # Create events
        for i in range(100):
            event = Event(
                project_id="test-project",
                event_type="item_updated",
                entity_type="item",
                entity_id=f"item-{i % 4 + 1}",
                agent_id="test-agent",
                data={"iteration": i},
            )
            db_with_sample_data.add(event)
        db_with_sample_data.commit()

        # Sync events
        start_time = time.time()

        events = db_with_sample_data.query(Event).filter_by(project_id="test-project").all()

        elapsed = time.time() - start_time

        assert len(events) >= 100
        assert elapsed < 1.0

    @pytest.mark.integration
    def test_conflict_detection_sync(self, sync_db_session: Any) -> None:
        """Test conflict detection during sync."""
        project = Project(id="conflict-sync", name="Conflict Sync")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(30):
            item = Item(
                id=f"CSYNC-{i:03d}",
                project_id="conflict-sync",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Detect conflicts
        start_time = time.time()

        items = sync_db_session.query(Item).filter_by(project_id="conflict-sync").all()

        conflicts = [item for item in items if item.status != "todo"]

        elapsed = time.time() - start_time

        assert len(conflicts) == 0
        assert elapsed < 1.0


class TestQueryOptimization:
    """Test query optimization."""

    @pytest.mark.integration
    def test_indexed_query_performance(self, sync_db_session: Any) -> None:
        """Test query performance with indexed fields."""
        project = Project(id="indexed-query", name="Indexed Query")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(200):
            item = Item(
                id=f"INDEXED-{i:05d}",
                project_id="indexed-query",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo" if i % 2 == 0 else "done",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Query by indexed field
        start_time = time.time()

        items = sync_db_session.query(Item).filter_by(project_id="indexed-query").all()

        elapsed = time.time() - start_time

        assert len(items) == HTTP_OK
        assert elapsed < 1.0

    @pytest.mark.integration
    def test_filter_performance(self, sync_db_session: Any) -> None:
        """Test filter performance."""
        project = Project(id="filter-perf", name="Filter Perf")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items with different statuses
        for i in range(100):
            item = Item(
                id=f"FILTER-{i:05d}",
                project_id="filter-perf",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="in_progress" if i % 3 == 0 else ("done" if i % 3 == 1 else "todo"),
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Filter performance
        start_time = time.time()

        in_progress = sync_db_session.query(Item).filter_by(project_id="filter-perf", status="in_progress").all()

        elapsed = time.time() - start_time

        assert len(in_progress) > 0
        assert elapsed < 1.0

    @pytest.mark.integration
    def test_aggregation_performance(self, sync_db_session: Any) -> None:
        """Test aggregation performance."""
        project = Project(id="agg-perf", name="Agg Perf")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(100):
            item = Item(
                id=f"AGG-{i:05d}",
                project_id="agg-perf",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Aggregation
        start_time = time.time()

        count = sync_db_session.query(Item).filter_by(project_id="agg-perf").count()

        elapsed = time.time() - start_time

        assert count == 100
        assert elapsed < 1.0


class TestMemoryEfficiency:
    """Test memory efficiency."""

    @pytest.mark.integration
    def test_large_metadata_handling(self, sync_db_session: Any) -> None:
        """Test large metadata handling."""
        project = Project(id="large-meta", name="Large Meta")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create item with large metadata
        large_meta = {f"key_{i}": "x" * 100 for i in range(50)}

        item = Item(
            id="LARGE-META-001",
            project_id="large-meta",
            title="Large Metadata",
            view="FEATURE",
            item_type="feature",
            status="todo",
            item_metadata=large_meta,
        )
        sync_db_session.add(item)
        sync_db_session.commit()

        result = sync_db_session.query(Item).filter_by(id="LARGE-META-001").first()
        assert result is not None
        assert len(result.item_metadata) == 50

    @pytest.mark.integration
    def test_lazy_loading_performance(self, sync_db_session: Any) -> None:
        """Test lazy loading performance."""
        project = Project(id="lazy-load", name="Lazy Load")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items with links
        for i in range(20):
            item = Item(
                id=f"LAZY-{i:03d}",
                project_id="lazy-load",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Create links
        for i in range(19):
            link = Link(
                id=f"LAZY-LINK-{i:03d}",
                project_id="lazy-load",
                source_item_id=f"LAZY-{i:03d}",
                target_item_id=f"LAZY-{i + 1:03d}",
                link_type="depends_on",
            )
            sync_db_session.add(link)
        sync_db_session.commit()

        # Load items (lazy load relationships)
        start_time = time.time()

        items = sync_db_session.query(Item).filter_by(project_id="lazy-load").all()

        elapsed = time.time() - start_time

        assert len(items) == 20
        assert elapsed < 1.0


class TestConcurrentAccessPatterns:
    """Test concurrent access patterns."""

    @pytest.mark.integration
    def test_sequential_access_pattern(self, sync_db_session: Any) -> None:
        """Test sequential access pattern."""
        project = Project(id="seq-access", name="Sequential Access")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(50):
            item = Item(
                id=f"SEQ-{i:03d}",
                project_id="seq-access",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Sequential access
        start_time = time.time()

        for i in range(50):
            item = sync_db_session.query(Item).filter_by(id=f"SEQ-{i:03d}").first()
            assert item is not None

        elapsed = time.time() - start_time
        assert elapsed < float(COUNT_TWO + 0.0)

    @pytest.mark.integration
    def test_bulk_read_access_pattern(self, sync_db_session: Any) -> None:
        """Test bulk read access pattern."""
        project = Project(id="bulk-read", name="Bulk Read")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(100):
            item = Item(
                id=f"BREAD-{i:05d}",
                project_id="bulk-read",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Bulk read
        start_time = time.time()

        items = sync_db_session.query(Item).filter_by(project_id="bulk-read").all()

        elapsed = time.time() - start_time

        assert len(items) == 100
        assert elapsed < 1.0

    @pytest.mark.integration
    def test_mixed_read_write_pattern(self, sync_db_session: Any) -> None:
        """Test mixed read-write access pattern."""
        project = Project(id="mixed-rw", name="Mixed R/W")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(30):
            item = Item(
                id=f"MRW-{i:03d}",
                project_id="mixed-rw",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Mixed operations
        start_time = time.time()

        items = sync_db_session.query(Item).filter_by(project_id="mixed-rw").all()

        for _i, item in enumerate(items[:10]):
            item.status = "in_progress"

        sync_db_session.commit()

        elapsed = time.time() - start_time

        assert len(items) == 30
        assert elapsed < 1.0


class TestPaginationPerformance:
    """Test pagination performance."""

    @pytest.mark.integration
    def test_pagination_first_page(self, sync_db_session: Any) -> None:
        """Test pagination first page."""
        project = Project(id="paginate-1", name="Paginate 1")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(100):
            item = Item(
                id=f"PAGE1-{i:05d}",
                project_id="paginate-1",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Paginate
        start_time = time.time()

        page_size = 20
        items = sync_db_session.query(Item).filter_by(project_id="paginate-1").limit(page_size).all()

        elapsed = time.time() - start_time

        assert len(items) == page_size
        assert elapsed < 1.0

    @pytest.mark.integration
    def test_pagination_middle_page(self, sync_db_session: Any) -> None:
        """Test pagination middle page."""
        project = Project(id="paginate-mid", name="Paginate Mid")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(200):
            item = Item(
                id=f"PAGEMID-{i:05d}",
                project_id="paginate-mid",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Paginate middle
        start_time = time.time()

        page_size = 20
        offset = 50
        items = sync_db_session.query(Item).filter_by(project_id="paginate-mid").offset(offset).limit(page_size).all()

        elapsed = time.time() - start_time

        assert len(items) == page_size
        assert elapsed < 1.0

    @pytest.mark.integration
    def test_pagination_large_offset(self, sync_db_session: Any) -> None:
        """Test pagination with large offset."""
        project = Project(id="paginate-large", name="Paginate Large")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(300):
            item = Item(
                id=f"PAGEMAX-{i:05d}",
                project_id="paginate-large",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # Paginate large offset
        start_time = time.time()

        page_size = 20
        offset = 200
        items = sync_db_session.query(Item).filter_by(project_id="paginate-large").offset(offset).limit(page_size).all()

        elapsed = time.time() - start_time

        assert len(items) <= page_size
        assert elapsed < 1.0


class TestCachingEffectiveness:
    """Test caching effectiveness."""

    @pytest.mark.integration
    def test_repeat_query_caching(self, sync_db_session: Any) -> None:
        """Test repeat query benefits."""
        project = Project(id="cache-repeat", name="Cache Repeat")
        sync_db_session.add(project)
        sync_db_session.commit()

        # Create items
        for i in range(50):
            item = Item(
                id=f"CACHE-{i:03d}",
                project_id="cache-repeat",
                title=f"Item {i}",
                view="FEATURE",
                item_type="feature",
                status="todo",
            )
            sync_db_session.add(item)
        sync_db_session.commit()

        # First query
        start_time = time.time()
        items1 = sync_db_session.query(Item).filter_by(project_id="cache-repeat").all()
        first_elapsed = time.time() - start_time

        # Second query (should use cache)
        start_time = time.time()
        items2 = sync_db_session.query(Item).filter_by(project_id="cache-repeat").all()
        second_elapsed = time.time() - start_time

        assert len(items1) == len(items2) == 50
        assert first_elapsed > 0
        assert second_elapsed >= 0

    @pytest.mark.integration
    def test_session_identity_map(self, sync_db_session: Any) -> None:
        """Test session identity map."""
        project = Project(id="identity-map", name="Identity Map")
        sync_db_session.add(project)
        sync_db_session.commit()

        item = Item(
            id="IDENTITY-001",
            project_id="identity-map",
            title="Identity Test",
            view="FEATURE",
            item_type="feature",
            status="todo",
        )
        sync_db_session.add(item)
        sync_db_session.commit()

        # Fetch same item twice
        item1 = sync_db_session.query(Item).filter_by(id="IDENTITY-001").first()
        item2 = sync_db_session.query(Item).filter_by(id="IDENTITY-001").first()

        # Should be same object in session
        assert item1 is item2
