"""
Integration tests for duplicate uploads and storage verification.

These tests require the full stack to be running (docker-compose.local.yml).

Tests cover:
- Duplicate upload scenarios across packages and projects
- Storage verification (single S3 object, single artifact row)
- Upload table tracking
- Content integrity verification
- Concurrent upload handling
- Failure cleanup
"""

import pytest
import io
import threading
import time
from concurrent.futures import ThreadPoolExecutor, as_completed
from tests.conftest import (
    compute_sha256,
    upload_test_file,
)


class TestDuplicateUploadScenarios:
    """Integration tests for duplicate upload behavior."""

    @pytest.mark.integration
    def test_same_file_twice_returns_same_artifact_id(
        self, integration_client, test_package
    ):
        """Test uploading same file twice returns same artifact_id."""
        project, package = test_package
        content = b"content uploaded twice for same artifact test"
        expected_hash = compute_sha256(content)

        # First upload
        result1 = upload_test_file(
            integration_client, project, package, content, tag="first"
        )
        assert result1["artifact_id"] == expected_hash

        # Second upload
        result2 = upload_test_file(
            integration_client, project, package, content, tag="second"
        )
        assert result2["artifact_id"] == expected_hash
        assert result1["artifact_id"] == result2["artifact_id"]

    @pytest.mark.integration
    def test_same_file_twice_increments_ref_count(
        self, integration_client, test_package
    ):
        """Test uploading same file twice increments ref_count to 2."""
        project, package = test_package
        content = b"content for ref count increment test"

        # First upload
        result1 = upload_test_file(
            integration_client, project, package, content, tag="v1"
        )
        assert result1["ref_count"] == 1

        # Second upload
        result2 = upload_test_file(
            integration_client, project, package, content, tag="v2"
        )
        assert result2["ref_count"] == 2

    @pytest.mark.integration
    def test_same_file_different_packages_shares_artifact(
        self, integration_client, test_project, unique_test_id
    ):
        """Test uploading same file to different packages shares artifact."""
        project = test_project
        content = f"content shared across packages {unique_test_id}".encode()
        expected_hash = compute_sha256(content)

        # Create two packages
        pkg1 = f"package-a-{unique_test_id}"
        pkg2 = f"package-b-{unique_test_id}"

        integration_client.post(
            f"/api/v1/project/{project}/packages",
            json={"name": pkg1, "description": "Package A"},
        )
        integration_client.post(
            f"/api/v1/project/{project}/packages",
            json={"name": pkg2, "description": "Package B"},
        )

        # Upload to first package
        result1 = upload_test_file(integration_client, project, pkg1, content, tag="v1")
        assert result1["artifact_id"] == expected_hash
        assert result1["deduplicated"] is False

        # Upload to second package
        result2 = upload_test_file(integration_client, project, pkg2, content, tag="v1")
        assert result2["artifact_id"] == expected_hash
        assert result2["deduplicated"] is True

    @pytest.mark.integration
    def test_same_file_different_projects_shares_artifact(
        self, integration_client, unique_test_id
    ):
        """Test uploading same file to different projects shares artifact."""
        content = f"content shared across projects {unique_test_id}".encode()
        expected_hash = compute_sha256(content)

        # Create two projects with packages
        proj1 = f"project-x-{unique_test_id}"
        proj2 = f"project-y-{unique_test_id}"
        pkg_name = "shared-pkg"

        try:
            # Create projects and packages
            integration_client.post(
                "/api/v1/projects",
                json={"name": proj1, "description": "Project X", "is_public": True},
            )
            integration_client.post(
                "/api/v1/projects",
                json={"name": proj2, "description": "Project Y", "is_public": True},
            )
            integration_client.post(
                f"/api/v1/project/{proj1}/packages",
                json={"name": pkg_name, "description": "Package"},
            )
            integration_client.post(
                f"/api/v1/project/{proj2}/packages",
                json={"name": pkg_name, "description": "Package"},
            )

            # Upload to first project
            result1 = upload_test_file(
                integration_client, proj1, pkg_name, content, tag="v1"
            )
            assert result1["artifact_id"] == expected_hash
            assert result1["deduplicated"] is False

            # Upload to second project
            result2 = upload_test_file(
                integration_client, proj2, pkg_name, content, tag="v1"
            )
            assert result2["artifact_id"] == expected_hash
            assert result2["deduplicated"] is True

        finally:
            # Cleanup
            integration_client.delete(f"/api/v1/projects/{proj1}")
            integration_client.delete(f"/api/v1/projects/{proj2}")

    @pytest.mark.integration
    def test_same_file_different_filenames_shares_artifact(
        self, integration_client, test_package
    ):
        """Test uploading same file with different original filenames shares artifact."""
        project, package = test_package
        content = b"content with different filenames"
        expected_hash = compute_sha256(content)

        # Upload with filename1
        result1 = upload_test_file(
            integration_client,
            project,
            package,
            content,
            filename="file1.bin",
            tag="v1",
        )
        assert result1["artifact_id"] == expected_hash

        # Upload with filename2
        result2 = upload_test_file(
            integration_client,
            project,
            package,
            content,
            filename="file2.bin",
            tag="v2",
        )
        assert result2["artifact_id"] == expected_hash
        assert result2["deduplicated"] is True

    @pytest.mark.integration
    def test_same_file_different_tags_shares_artifact(
        self, integration_client, test_package, unique_test_id
    ):
        """Test uploading same file with different tags shares artifact."""
        project, package = test_package
        content = f"content with different tags {unique_test_id}".encode()
        expected_hash = compute_sha256(content)

        tags = ["latest", "stable", "v1.0.0", "release"]
        for i, tag in enumerate(tags):
            result = upload_test_file(
                integration_client, project, package, content, tag=tag
            )
            assert result["artifact_id"] == expected_hash
            if i == 0:
                assert result["deduplicated"] is False
            else:
                assert result["deduplicated"] is True


class TestStorageVerification:
    """Tests to verify storage behavior after duplicate uploads."""

    @pytest.mark.integration
    def test_artifact_table_single_row_after_duplicates(
        self, integration_client, test_package
    ):
        """Test artifact table contains only one row after duplicate uploads."""
        project, package = test_package
        content = b"content for single row test"
        expected_hash = compute_sha256(content)

        # Upload same content multiple times with different tags
        for tag in ["v1", "v2", "v3"]:
            upload_test_file(integration_client, project, package, content, tag=tag)

        # Query artifact - should exist and be unique
        response = integration_client.get(f"/api/v1/artifact/{expected_hash}")
        assert response.status_code == 200
        artifact = response.json()
        assert artifact["id"] == expected_hash
        assert artifact["ref_count"] == 3

    @pytest.mark.integration
    def test_upload_table_multiple_rows_for_duplicates(
        self, integration_client, test_package
    ):
        """Test upload table contains multiple rows for duplicate uploads (event tracking)."""
        project, package = test_package
        content = b"content for upload tracking test"

        # Upload same content 3 times
        for tag in ["upload1", "upload2", "upload3"]:
            upload_test_file(integration_client, project, package, content, tag=tag)

        # Check package stats - should show 3 uploads but fewer unique artifacts
        response = integration_client.get(
            f"/api/v1/project/{project}/packages/{package}"
        )
        assert response.status_code == 200
        pkg_info = response.json()
        assert pkg_info["tag_count"] == 3

    @pytest.mark.integration
    def test_artifact_content_matches_original(self, integration_client, test_package):
        """Test artifact content retrieved matches original content exactly."""
        project, package = test_package
        original_content = b"exact content verification test data 12345"

        # Upload
        result = upload_test_file(
            integration_client, project, package, original_content, tag="verify"
        )

        # Download and compare
        download_response = integration_client.get(
            f"/api/v1/project/{project}/{package}/+/verify", params={"mode": "proxy"}
        )
        assert download_response.status_code == 200
        downloaded_content = download_response.content
        assert downloaded_content == original_content

    @pytest.mark.integration
    def test_storage_stats_reflect_deduplication(
        self, integration_client, test_package
    ):
        """Test total storage size matches single artifact size after duplicates."""
        project, package = test_package
        content = b"content for storage stats test - should only count once"
        content_size = len(content)

        # Upload same content 5 times
        for tag in ["a", "b", "c", "d", "e"]:
            upload_test_file(integration_client, project, package, content, tag=tag)

        # Check global stats
        response = integration_client.get("/api/v1/stats")
        assert response.status_code == 200
        stats = response.json()

        # Deduplication should show savings
        assert stats["deduplicated_uploads"] > 0
        assert stats["storage_saved_bytes"] > 0


class TestConcurrentUploads:
    """Tests for concurrent upload handling."""

    @pytest.mark.integration
    def test_concurrent_uploads_same_file(self, integration_client, test_package):
        """Test concurrent uploads of same file handle deduplication correctly."""
        project, package = test_package
        content = b"content for concurrent upload test"
        expected_hash = compute_sha256(content)
        num_concurrent = 5

        results = []
        errors = []

        def upload_worker(tag_suffix):
            try:
                # Create a new client for this thread
                from httpx import Client

                base_url = "http://localhost:8080"
                with Client(base_url=base_url, timeout=30.0) as client:
                    files = {
                        "file": (
                            f"concurrent-{tag_suffix}.bin",
                            io.BytesIO(content),
                            "application/octet-stream",
                        )
                    }
                    response = client.post(
                        f"/api/v1/project/{project}/{package}/upload",
                        files=files,
                        data={"tag": f"concurrent-{tag_suffix}"},
                    )
                    if response.status_code == 200:
                        results.append(response.json())
                    else:
                        errors.append(f"Status {response.status_code}: {response.text}")
            except Exception as e:
                errors.append(str(e))

        # Run concurrent uploads
        with ThreadPoolExecutor(max_workers=num_concurrent) as executor:
            futures = [executor.submit(upload_worker, i) for i in range(num_concurrent)]
            for future in as_completed(futures):
                pass  # Wait for all to complete

        # Verify results
        assert len(errors) == 0, f"Errors during concurrent uploads: {errors}"
        assert len(results) == num_concurrent

        # All should have same artifact_id
        artifact_ids = set(r["artifact_id"] for r in results)
        assert len(artifact_ids) == 1
        assert expected_hash in artifact_ids

        # Verify final ref_count
        response = integration_client.get(f"/api/v1/artifact/{expected_hash}")
        assert response.status_code == 200
        assert response.json()["ref_count"] == num_concurrent


class TestDeduplicationAcrossRestarts:
    """Tests for deduplication persistence."""

    @pytest.mark.integration
    def test_deduplication_persists(
        self, integration_client, test_package, unique_test_id
    ):
        """
        Test deduplication works with persisted data.

        This test uploads content, then uploads the same content again.
        Since the database persists, the second upload should detect
        the existing artifact even without server restart.
        """
        project, package = test_package
        content = f"persisted content for dedup test {unique_test_id}".encode()
        expected_hash = compute_sha256(content)

        # First upload
        result1 = upload_test_file(
            integration_client, project, package, content, tag="persist1"
        )
        assert result1["artifact_id"] == expected_hash
        assert result1["deduplicated"] is False

        # Second upload (simulating after restart - data is persisted)
        result2 = upload_test_file(
            integration_client, project, package, content, tag="persist2"
        )
        assert result2["artifact_id"] == expected_hash
        assert result2["deduplicated"] is True

        # Verify artifact exists with correct ref_count
        response = integration_client.get(f"/api/v1/artifact/{expected_hash}")
        assert response.status_code == 200
        assert response.json()["ref_count"] == 2