"""Tests for artifact dependency management.

Tests cover:
- #76: Database Schema for Artifact Dependencies
- #77: Ensure File Parsing and Storage on Upload
- #78: Dependency Query API Endpoints
- #79: Server-Side Dependency Resolution
- #80: Circular Dependency Detection
- #81: Dependency Conflict Detection and Reporting
"""

import pytest
import yaml
from uuid import uuid4
from io import BytesIO

# For schema validation tests
from pydantic import ValidationError


def unique_content(base: str, test_id: str, extra: str = "") -> bytes:
    """Generate unique content to avoid artifact hash collisions between tests."""
    return f"{base}-{test_id}-{extra}-{uuid4().hex[:8]}".encode()


class TestDependencySchema:
    """Tests for #76: Database Schema for Artifact Dependencies"""

    @pytest.mark.integration
    def test_create_dependency_with_version(
        self, integration_client, test_package, unique_test_id
    ):
        """Test creating a dependency with version constraint."""
        project_name, package_name = test_package

        # First upload an artifact
        content = unique_content("test-deps", unique_test_id, "schema1")
        files = {"file": ("test.tar.gz", BytesIO(content), "application/gzip")}
        response = integration_client.post(
            f"/api/v1/project/{project_name}/{package_name}/upload",
            files=files,
            data={"tag": f"v1.0.0-{unique_test_id}"},
        )
        assert response.status_code == 200

        # Create a second project to depend on
        dep_project_name = f"dep-project-{uuid4().hex[:8]}"
        response = integration_client.post(
            "/api/v1/projects", json={"name": dep_project_name}
        )
        assert response.status_code == 200

        try:
            # Now test the dependency creation via API (once implemented)
            # For now, verify the schema constraints work at DB level
            pass
        finally:
            # Cleanup
            integration_client.delete(f"/api/v1/projects/{dep_project_name}")

    @pytest.mark.integration
    def test_dependency_requires_version_or_tag(self, integration_client):
        """Test that dependency must have either version or tag, not both or neither."""
        from app.schemas import DependencyCreate

        # Test: neither version nor tag
        with pytest.raises(ValidationError) as exc_info:
            DependencyCreate(project="proj", package="pkg")
        assert "Either 'version' or 'tag' must be specified" in str(exc_info.value)

        # Test: both version and tag
        with pytest.raises(ValidationError) as exc_info:
            DependencyCreate(project="proj", package="pkg", version="1.0.0", tag="stable")
        assert "Cannot specify both 'version' and 'tag'" in str(exc_info.value)

        # Test: valid with version
        dep = DependencyCreate(project="proj", package="pkg", version="1.0.0")
        assert dep.version == "1.0.0"
        assert dep.tag is None

        # Test: valid with tag
        dep = DependencyCreate(project="proj", package="pkg", tag="stable")
        assert dep.tag == "stable"
        assert dep.version is None

    @pytest.mark.integration
    def test_dependency_unique_constraint(
        self, integration_client, test_package
    ):
        """Test that an artifact can only have one dependency per project/package."""
        # This will be tested once the upload with ensure file is implemented
        pass


class TestEnsureFileParsing:
    """Tests for #77: Ensure File Parsing and Storage on Upload"""

    @pytest.mark.integration
    def test_upload_with_valid_ensure_file(
        self, integration_client, test_package, unique_test_id
    ):
        """Test uploading an artifact with a valid orchard.ensure file."""
        project_name, package_name = test_package

        # Create dependency project
        dep_project_name = f"dep-project-{unique_test_id}"
        response = integration_client.post(
            "/api/v1/projects", json={"name": dep_project_name}
        )
        assert response.status_code == 200

        try:
            # Create ensure file content
            ensure_content = yaml.dump({
                "dependencies": [
                    {"project": dep_project_name, "package": "some-pkg", "version": "1.0.0"}
                ]
            })

            # Upload artifact with ensure file - use unique content to avoid conflicts
            content = unique_content("test-ensure", unique_test_id, "valid")
            files = {
                "file": ("test-artifact.tar.gz", BytesIO(content), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_content.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{project_name}/{package_name}/upload",
                files=files,
                data={"tag": f"v1.0.0-{unique_test_id}"},
            )
            assert response.status_code == 200
            data = response.json()
            artifact_id = data["artifact_id"]

            # Verify dependencies were stored
            response = integration_client.get(
                f"/api/v1/artifact/{artifact_id}/dependencies"
            )
            assert response.status_code == 200
            deps = response.json()
            assert len(deps["dependencies"]) == 1
            assert deps["dependencies"][0]["project"] == dep_project_name
            assert deps["dependencies"][0]["package"] == "some-pkg"
            assert deps["dependencies"][0]["version"] == "1.0.0"

        finally:
            integration_client.delete(f"/api/v1/projects/{dep_project_name}")

    @pytest.mark.integration
    def test_upload_with_invalid_ensure_file(
        self, integration_client, test_package, unique_test_id
    ):
        """Test uploading with invalid YAML ensure file."""
        project_name, package_name = test_package

        # Invalid YAML
        content = unique_content("test-invalid", unique_test_id, "yaml")
        files = {
            "file": ("test-artifact.tar.gz", BytesIO(content), "application/gzip"),
            "ensure": ("orchard.ensure", BytesIO(b"invalid: yaml: content: ["), "application/x-yaml"),
        }
        response = integration_client.post(
            f"/api/v1/project/{project_name}/{package_name}/upload",
            files=files,
            data={"tag": f"v1.0.0-{unique_test_id}"},
        )
        assert response.status_code == 400
        assert "Invalid ensure file" in response.json().get("detail", "")

    @pytest.mark.integration
    def test_upload_with_missing_dependency_project(
        self, integration_client, test_package, unique_test_id
    ):
        """Test uploading with ensure file referencing non-existent project."""
        project_name, package_name = test_package

        ensure_content = yaml.dump({
            "dependencies": [
                {"project": "nonexistent-project-xyz", "package": "some-pkg", "version": "1.0.0"}
            ]
        })

        content = unique_content("test-missing", unique_test_id, "project")
        files = {
            "file": ("test-artifact.tar.gz", BytesIO(content), "application/gzip"),
            "ensure": ("orchard.ensure", BytesIO(ensure_content.encode()), "application/x-yaml"),
        }
        response = integration_client.post(
            f"/api/v1/project/{project_name}/{package_name}/upload",
            files=files,
            data={"tag": f"v1.0.0-{unique_test_id}"},
        )
        assert response.status_code == 400
        assert "Project" in response.json().get("detail", "")
        assert "not found" in response.json().get("detail", "").lower()

    @pytest.mark.integration
    def test_upload_without_ensure_file(
        self, integration_client, test_package, unique_test_id
    ):
        """Test normal upload without ensure file still works."""
        project_name, package_name = test_package

        content = unique_content("test-nodeps", unique_test_id, "upload")
        files = {
            "file": ("test-artifact.tar.gz", BytesIO(content), "application/gzip"),
        }
        response = integration_client.post(
            f"/api/v1/project/{project_name}/{package_name}/upload",
            files=files,
            data={"tag": f"v1.0.0-nodeps-{unique_test_id}"},
        )
        assert response.status_code == 200

    @pytest.mark.integration
    def test_upload_ensure_file_both_version_and_tag(
        self, integration_client, test_package, unique_test_id
    ):
        """Test that ensure file with both version and tag is rejected."""
        project_name, package_name = test_package

        dep_project_name = f"dep-project-{unique_test_id}"
        response = integration_client.post(
            "/api/v1/projects", json={"name": dep_project_name}
        )
        assert response.status_code == 200

        try:
            ensure_content = yaml.dump({
                "dependencies": [
                    {"project": dep_project_name, "package": "pkg", "version": "1.0.0", "tag": "stable"}
                ]
            })

            content = unique_content("test-both", unique_test_id, "constraint")
            files = {
                "file": ("test.tar.gz", BytesIO(content), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_content.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{project_name}/{package_name}/upload",
                files=files,
                data={"tag": f"v1.0.0-{unique_test_id}"},
            )
            assert response.status_code == 400
            assert "both" in response.json().get("detail", "").lower() or \
                   "version" in response.json().get("detail", "").lower()
        finally:
            integration_client.delete(f"/api/v1/projects/{dep_project_name}")


class TestDependencyQueryEndpoints:
    """Tests for #78: Dependency Query API Endpoints"""

    @pytest.mark.integration
    def test_get_artifact_dependencies(
        self, integration_client, test_package, unique_test_id
    ):
        """Test GET /api/v1/artifact/{artifact_id}/dependencies"""
        project_name, package_name = test_package

        # Create dependency project
        dep_project_name = f"dep-project-{unique_test_id}"
        response = integration_client.post(
            "/api/v1/projects", json={"name": dep_project_name}
        )
        assert response.status_code == 200

        try:
            # Upload artifact with dependencies
            ensure_content = yaml.dump({
                "dependencies": [
                    {"project": dep_project_name, "package": "lib-a", "version": "1.0.0"},
                    {"project": dep_project_name, "package": "lib-b", "tag": "stable"},
                ]
            })

            content = unique_content("test-deps", unique_test_id, "query")
            files = {
                "file": ("artifact.tar.gz", BytesIO(content), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_content.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{project_name}/{package_name}/upload",
                files=files,
                data={"tag": f"v2.0.0-{unique_test_id}"},
            )
            assert response.status_code == 200
            artifact_id = response.json()["artifact_id"]

            # Get dependencies
            response = integration_client.get(f"/api/v1/artifact/{artifact_id}/dependencies")
            assert response.status_code == 200
            data = response.json()
            assert data["artifact_id"] == artifact_id
            assert len(data["dependencies"]) == 2

            # Verify both dependencies
            deps = {d["package"]: d for d in data["dependencies"]}
            assert "lib-a" in deps
            assert deps["lib-a"]["version"] == "1.0.0"
            assert deps["lib-a"]["tag"] is None
            assert "lib-b" in deps
            assert deps["lib-b"]["tag"] == "stable"
            assert deps["lib-b"]["version"] is None

        finally:
            integration_client.delete(f"/api/v1/projects/{dep_project_name}")

    @pytest.mark.integration
    def test_get_dependencies_by_ref(
        self, integration_client, test_package, unique_test_id
    ):
        """Test GET /api/v1/project/{proj}/{pkg}/+/{ref}/dependencies"""
        project_name, package_name = test_package

        dep_project_name = f"dep-project-{unique_test_id}"
        response = integration_client.post(
            "/api/v1/projects", json={"name": dep_project_name}
        )
        assert response.status_code == 200

        try:
            ensure_content = yaml.dump({
                "dependencies": [
                    {"project": dep_project_name, "package": "lib-c", "version": "2.0.0"},
                ]
            })

            tag_name = f"v3.0.0-{unique_test_id}"
            content = unique_content("test-ref", unique_test_id, "deps")
            files = {
                "file": ("artifact.tar.gz", BytesIO(content), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_content.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{project_name}/{package_name}/upload",
                files=files,
                data={"tag": tag_name},
            )
            assert response.status_code == 200

            # Get dependencies by tag
            response = integration_client.get(
                f"/api/v1/project/{project_name}/{package_name}/+/{tag_name}/dependencies"
            )
            assert response.status_code == 200
            data = response.json()
            assert len(data["dependencies"]) == 1
            assert data["dependencies"][0]["package"] == "lib-c"

        finally:
            integration_client.delete(f"/api/v1/projects/{dep_project_name}")

    @pytest.mark.integration
    def test_get_reverse_dependencies(
        self, integration_client, test_package, unique_test_id
    ):
        """Test GET /api/v1/project/{proj}/{pkg}/reverse-dependencies"""
        project_name, package_name = test_package

        # Create the dependency target project/package
        dep_project_name = f"lib-project-{unique_test_id}"
        response = integration_client.post(
            "/api/v1/projects", json={"name": dep_project_name}
        )
        assert response.status_code == 200

        try:
            # Create the target package with an artifact
            response = integration_client.post(
                f"/api/v1/project/{dep_project_name}/packages",
                json={"name": "target-lib"}
            )
            assert response.status_code == 200

            content = unique_content("lib", unique_test_id, "target")
            files = {
                "file": ("lib.tar.gz", BytesIO(content), "application/gzip"),
            }
            response = integration_client.post(
                f"/api/v1/project/{dep_project_name}/target-lib/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Now upload an artifact that depends on the target
            ensure_content = yaml.dump({
                "dependencies": [
                    {"project": dep_project_name, "package": "target-lib", "version": "1.0.0"},
                ]
            })

            content = unique_content("app", unique_test_id, "reverse")
            files = {
                "file": ("app.tar.gz", BytesIO(content), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_content.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{project_name}/{package_name}/upload",
                files=files,
                data={"tag": f"v4.0.0-{unique_test_id}"},
            )
            assert response.status_code == 200

            # Check reverse dependencies
            response = integration_client.get(
                f"/api/v1/project/{dep_project_name}/target-lib/reverse-dependencies"
            )
            assert response.status_code == 200
            data = response.json()
            assert data["project"] == dep_project_name
            assert data["package"] == "target-lib"
            assert len(data["dependents"]) >= 1

            # Find our dependent
            found = False
            for dep in data["dependents"]:
                if dep["project"] == project_name:
                    found = True
                    assert dep["constraint_type"] == "version"
                    assert dep["constraint_value"] == "1.0.0"
                    break
            assert found, "Our package should be in the dependents list"

        finally:
            integration_client.delete(f"/api/v1/projects/{dep_project_name}")

    @pytest.mark.integration
    def test_get_dependencies_empty(
        self, integration_client, test_package, unique_test_id
    ):
        """Test getting dependencies for artifact with no deps."""
        project_name, package_name = test_package

        # Upload without ensure file
        content = unique_content("nodeps", unique_test_id, "empty")
        files = {
            "file": ("nodeps.tar.gz", BytesIO(content), "application/gzip"),
        }
        response = integration_client.post(
            f"/api/v1/project/{project_name}/{package_name}/upload",
            files=files,
            data={"tag": f"v5.0.0-nodeps-{unique_test_id}"},
        )
        assert response.status_code == 200
        artifact_id = response.json()["artifact_id"]

        response = integration_client.get(f"/api/v1/artifact/{artifact_id}/dependencies")
        assert response.status_code == 200
        data = response.json()
        assert data["artifact_id"] == artifact_id
        assert len(data["dependencies"]) == 0


class TestDependencyResolution:
    """Tests for #79: Server-Side Dependency Resolution"""

    @pytest.mark.integration
    def test_resolve_simple_chain(
        self, integration_client, test_project, unique_test_id
    ):
        """Test resolving A -> B -> C dependency chain."""
        # Create packages A, B, C
        pkg_a = f"pkg-a-{unique_test_id}"
        pkg_b = f"pkg-b-{unique_test_id}"
        pkg_c = f"pkg-c-{unique_test_id}"

        # Create all packages
        for pkg in [pkg_a, pkg_b, pkg_c]:
            response = integration_client.post(
                f"/api/v1/project/{test_project}/packages",
                json={"name": pkg}
            )
            assert response.status_code == 200

        try:
            # Upload C (no deps)
            content_c = unique_content("pkg-c", unique_test_id, "chain")
            files = {"file": ("c.tar.gz", BytesIO(content_c), "application/gzip")}
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_c}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload B (depends on C)
            ensure_b = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_c, "version": "1.0.0"}
                ]
            })
            content_b = unique_content("pkg-b", unique_test_id, "chain")
            files = {
                "file": ("b.tar.gz", BytesIO(content_b), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_b.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_b}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload A (depends on B)
            ensure_a = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_b, "version": "1.0.0"}
                ]
            })
            content_a = unique_content("pkg-a", unique_test_id, "chain")
            files = {
                "file": ("a.tar.gz", BytesIO(content_a), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_a.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_a}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Resolve dependencies for A
            response = integration_client.get(
                f"/api/v1/project/{test_project}/{pkg_a}/+/1.0.0/resolve"
            )
            assert response.status_code == 200
            data = response.json()

            # Should have 3 artifacts: C, B, A (in topological order)
            assert data["artifact_count"] == 3
            packages = [r["package"] for r in data["resolved"]]

            # C should come before B, B should come before A
            assert packages.index(pkg_c) < packages.index(pkg_b)
            assert packages.index(pkg_b) < packages.index(pkg_a)

        finally:
            # Cleanup packages
            for pkg in [pkg_a, pkg_b, pkg_c]:
                integration_client.delete(f"/api/v1/project/{test_project}/packages/{pkg}")

    @pytest.mark.integration
    def test_resolve_diamond_dependency(
        self, integration_client, test_project, unique_test_id
    ):
        """Test resolving diamond: A -> B -> D, A -> C -> D (D appears once)."""
        pkg_a = f"diamond-a-{unique_test_id}"
        pkg_b = f"diamond-b-{unique_test_id}"
        pkg_c = f"diamond-c-{unique_test_id}"
        pkg_d = f"diamond-d-{unique_test_id}"

        for pkg in [pkg_a, pkg_b, pkg_c, pkg_d]:
            response = integration_client.post(
                f"/api/v1/project/{test_project}/packages",
                json={"name": pkg}
            )
            assert response.status_code == 200

        try:
            # Upload D (no deps)
            content_d = unique_content("pkg-d", unique_test_id, "diamond")
            files = {"file": ("d.tar.gz", BytesIO(content_d), "application/gzip")}
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_d}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload B (depends on D)
            ensure_b = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_d, "version": "1.0.0"}
                ]
            })
            content_b = unique_content("pkg-b", unique_test_id, "diamond")
            files = {
                "file": ("b.tar.gz", BytesIO(content_b), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_b.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_b}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload C (also depends on D)
            ensure_c = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_d, "version": "1.0.0"}
                ]
            })
            content_c = unique_content("pkg-c", unique_test_id, "diamond")
            files = {
                "file": ("c.tar.gz", BytesIO(content_c), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_c.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_c}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload A (depends on B and C)
            ensure_a = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_b, "version": "1.0.0"},
                    {"project": test_project, "package": pkg_c, "version": "1.0.0"},
                ]
            })
            content_a = unique_content("pkg-a", unique_test_id, "diamond")
            files = {
                "file": ("a.tar.gz", BytesIO(content_a), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_a.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_a}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Resolve A
            response = integration_client.get(
                f"/api/v1/project/{test_project}/{pkg_a}/+/1.0.0/resolve"
            )
            assert response.status_code == 200
            data = response.json()

            # Should have 4 artifacts, D appears only once
            assert data["artifact_count"] == 4
            packages = [r["package"] for r in data["resolved"]]
            assert packages.count(pkg_d) == 1  # D only once

            # D should come before B and C
            d_idx = packages.index(pkg_d)
            b_idx = packages.index(pkg_b)
            c_idx = packages.index(pkg_c)
            a_idx = packages.index(pkg_a)
            assert d_idx < b_idx
            assert d_idx < c_idx
            assert b_idx < a_idx
            assert c_idx < a_idx

        finally:
            for pkg in [pkg_a, pkg_b, pkg_c, pkg_d]:
                integration_client.delete(f"/api/v1/project/{test_project}/packages/{pkg}")

    @pytest.mark.integration
    def test_resolve_no_dependencies(
        self, integration_client, test_package, unique_test_id
    ):
        """Test resolving artifact with no dependencies."""
        project_name, package_name = test_package

        content = unique_content("solo", unique_test_id, "nodeps")
        files = {"file": ("solo.tar.gz", BytesIO(content), "application/gzip")}
        response = integration_client.post(
            f"/api/v1/project/{project_name}/{package_name}/upload",
            files=files,
            data={"tag": f"solo-{unique_test_id}"},
        )
        assert response.status_code == 200

        response = integration_client.get(
            f"/api/v1/project/{project_name}/{package_name}/+/solo-{unique_test_id}/resolve"
        )
        assert response.status_code == 200
        data = response.json()
        assert data["artifact_count"] == 1
        assert data["resolved"][0]["package"] == package_name

    @pytest.mark.integration
    def test_resolve_missing_dependency(
        self, integration_client, test_package, unique_test_id
    ):
        """Test resolution fails when dependency doesn't exist."""
        project_name, package_name = test_package

        ensure_content = yaml.dump({
            "dependencies": [
                {"project": project_name, "package": "nonexistent-pkg-xyz", "version": "1.0.0"}
            ]
        })

        # First we need a project that exists to reference
        # Upload artifact with dependency on nonexistent package version
        content = unique_content("missing", unique_test_id, "dep")
        files = {
            "file": ("missing-dep.tar.gz", BytesIO(content), "application/gzip"),
            "ensure": ("orchard.ensure", BytesIO(ensure_content.encode()), "application/x-yaml"),
        }
        response = integration_client.post(
            f"/api/v1/project/{project_name}/{package_name}/upload",
            files=files,
            data={"tag": f"missing-dep-{unique_test_id}"},
        )
        # Should fail at upload time since package doesn't exist
        # OR succeed at upload but fail at resolution
        # Depending on implementation choice
        if response.status_code == 200:
            # Resolution should fail
            response = integration_client.get(
                f"/api/v1/project/{project_name}/{package_name}/+/missing-dep-{unique_test_id}/resolve"
            )
            assert response.status_code == 404


class TestCircularDependencyDetection:
    """Tests for #80: Circular Dependency Detection"""

    @pytest.mark.integration
    def test_detect_direct_cycle(
        self, integration_client, test_project, unique_test_id
    ):
        """Test detection of direct cycle: A -> B -> A"""
        pkg_a = f"cycle-a-{unique_test_id}"
        pkg_b = f"cycle-b-{unique_test_id}"

        for pkg in [pkg_a, pkg_b]:
            response = integration_client.post(
                f"/api/v1/project/{test_project}/packages",
                json={"name": pkg}
            )
            assert response.status_code == 200

        try:
            # Upload A (no deps initially)
            content_a1 = unique_content("A-v1", unique_test_id, "cycle")
            files = {"file": ("a.tar.gz", BytesIO(content_a1), "application/gzip")}
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_a}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload B (depends on A)
            ensure_b = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_a, "version": "1.0.0"}
                ]
            })
            content_b = unique_content("B", unique_test_id, "cycle")
            files = {
                "file": ("b.tar.gz", BytesIO(content_b), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_b.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_b}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Try to upload A v2 that depends on B (creating cycle)
            ensure_a2 = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_b, "version": "1.0.0"}
                ]
            })
            content_a2 = unique_content("A-v2", unique_test_id, "cycle")
            files = {
                "file": ("a2.tar.gz", BytesIO(content_a2), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_a2.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_a}/upload",
                files=files,
                data={"tag": "2.0.0"},
            )
            # Should be rejected with 400 (circular dependency)
            assert response.status_code == 400
            data = response.json()
            assert "circular" in data.get("detail", "").lower() or \
                   data.get("error") == "circular_dependency"

        finally:
            for pkg in [pkg_a, pkg_b]:
                integration_client.delete(f"/api/v1/project/{test_project}/packages/{pkg}")

    @pytest.mark.integration
    def test_detect_indirect_cycle(
        self, integration_client, test_project, unique_test_id
    ):
        """Test detection of indirect cycle: A -> B -> C -> A"""
        pkg_a = f"icycle-a-{unique_test_id}"
        pkg_b = f"icycle-b-{unique_test_id}"
        pkg_c = f"icycle-c-{unique_test_id}"

        for pkg in [pkg_a, pkg_b, pkg_c]:
            response = integration_client.post(
                f"/api/v1/project/{test_project}/packages",
                json={"name": pkg}
            )
            assert response.status_code == 200

        try:
            # Upload A v1 (no deps)
            content_a1 = unique_content("A-v1", unique_test_id, "icycle")
            files = {"file": ("a.tar.gz", BytesIO(content_a1), "application/gzip")}
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_a}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload B (depends on A)
            ensure_b = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_a, "version": "1.0.0"}
                ]
            })
            content_b = unique_content("B", unique_test_id, "icycle")
            files = {
                "file": ("b.tar.gz", BytesIO(content_b), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_b.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_b}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload C (depends on B)
            ensure_c = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_b, "version": "1.0.0"}
                ]
            })
            content_c = unique_content("C", unique_test_id, "icycle")
            files = {
                "file": ("c.tar.gz", BytesIO(content_c), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_c.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_c}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Try to upload A v2 that depends on C (creating cycle A -> C -> B -> A)
            ensure_a2 = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_c, "version": "1.0.0"}
                ]
            })
            content_a2 = unique_content("A-v2", unique_test_id, "icycle")
            files = {
                "file": ("a2.tar.gz", BytesIO(content_a2), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_a2.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_a}/upload",
                files=files,
                data={"tag": "2.0.0"},
            )
            assert response.status_code == 400
            data = response.json()
            assert "circular" in data.get("detail", "").lower() or \
                   data.get("error") == "circular_dependency"

        finally:
            for pkg in [pkg_a, pkg_b, pkg_c]:
                integration_client.delete(f"/api/v1/project/{test_project}/packages/{pkg}")

    @pytest.mark.integration
    def test_diamond_is_not_cycle(
        self, integration_client, test_project, unique_test_id
    ):
        """Test that diamond dependency is allowed (not a cycle)."""
        # Diamond: A -> B -> D, A -> C -> D
        # This is already tested in test_resolve_diamond_dependency
        # Just verify it doesn't trigger cycle detection
        pass  # Covered by TestDependencyResolution.test_resolve_diamond_dependency


class TestConflictDetection:
    """Tests for #81: Dependency Conflict Detection and Reporting"""

    @pytest.mark.integration
    def test_detect_version_conflict(
        self, integration_client, test_project, unique_test_id
    ):
        """Test conflict when two deps require different versions of same package."""
        pkg_app = f"conflict-app-{unique_test_id}"
        pkg_lib_a = f"conflict-lib-a-{unique_test_id}"
        pkg_lib_b = f"conflict-lib-b-{unique_test_id}"
        pkg_common = f"conflict-common-{unique_test_id}"

        for pkg in [pkg_app, pkg_lib_a, pkg_lib_b, pkg_common]:
            response = integration_client.post(
                f"/api/v1/project/{test_project}/packages",
                json={"name": pkg}
            )
            assert response.status_code == 200

        try:
            # Upload common v1.0.0
            content_common1 = unique_content("common-v1", unique_test_id, "conflict")
            files = {"file": ("common1.tar.gz", BytesIO(content_common1), "application/gzip")}
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_common}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload common v2.0.0
            content_common2 = unique_content("common-v2", unique_test_id, "conflict")
            files = {"file": ("common2.tar.gz", BytesIO(content_common2), "application/gzip")}
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_common}/upload",
                files=files,
                data={"tag": "2.0.0"},
            )
            assert response.status_code == 200

            # Upload lib-a (depends on common@1.0.0)
            ensure_lib_a = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_common, "version": "1.0.0"}
                ]
            })
            content_lib_a = unique_content("lib-a", unique_test_id, "conflict")
            files = {
                "file": ("lib-a.tar.gz", BytesIO(content_lib_a), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_lib_a.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_lib_a}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload lib-b (depends on common@2.0.0)
            ensure_lib_b = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_common, "version": "2.0.0"}
                ]
            })
            content_lib_b = unique_content("lib-b", unique_test_id, "conflict")
            files = {
                "file": ("lib-b.tar.gz", BytesIO(content_lib_b), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_lib_b.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_lib_b}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Upload app (depends on both lib-a and lib-b)
            ensure_app = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_lib_a, "version": "1.0.0"},
                    {"project": test_project, "package": pkg_lib_b, "version": "1.0.0"},
                ]
            })
            content_app = unique_content("app", unique_test_id, "conflict")
            files = {
                "file": ("app.tar.gz", BytesIO(content_app), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_app.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_app}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Try to resolve app - should report conflict
            response = integration_client.get(
                f"/api/v1/project/{test_project}/{pkg_app}/+/1.0.0/resolve"
            )
            assert response.status_code == 409
            data = response.json()
            # Error details are nested in "detail" for HTTPException
            detail = data.get("detail", data)
            assert detail.get("error") == "dependency_conflict"
            assert len(detail.get("conflicts", [])) > 0

            # Verify conflict details
            conflict = detail["conflicts"][0]
            assert conflict["package"] == pkg_common
            assert len(conflict["requirements"]) == 2

        finally:
            for pkg in [pkg_app, pkg_lib_a, pkg_lib_b, pkg_common]:
                integration_client.delete(f"/api/v1/project/{test_project}/packages/{pkg}")

    @pytest.mark.integration
    def test_no_conflict_same_version(
        self, integration_client, test_project, unique_test_id
    ):
        """Test no conflict when multiple deps require same version."""
        pkg_app = f"noconflict-app-{unique_test_id}"
        pkg_lib_a = f"noconflict-lib-a-{unique_test_id}"
        pkg_lib_b = f"noconflict-lib-b-{unique_test_id}"
        pkg_common = f"noconflict-common-{unique_test_id}"

        for pkg in [pkg_app, pkg_lib_a, pkg_lib_b, pkg_common]:
            response = integration_client.post(
                f"/api/v1/project/{test_project}/packages",
                json={"name": pkg}
            )
            assert response.status_code == 200

        try:
            # Upload common v1.0.0
            content_common = unique_content("common", unique_test_id, "noconflict")
            files = {"file": ("common.tar.gz", BytesIO(content_common), "application/gzip")}
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_common}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Both lib-a and lib-b depend on common@1.0.0
            for lib_name, lib_pkg in [("lib-a", pkg_lib_a), ("lib-b", pkg_lib_b)]:
                ensure = yaml.dump({
                    "dependencies": [
                        {"project": test_project, "package": pkg_common, "version": "1.0.0"}
                    ]
                })
                content_lib = unique_content(lib_name, unique_test_id, "noconflict")
                files = {
                    "file": (f"{lib_name}.tar.gz", BytesIO(content_lib), "application/gzip"),
                    "ensure": ("orchard.ensure", BytesIO(ensure.encode()), "application/x-yaml"),
                }
                response = integration_client.post(
                    f"/api/v1/project/{test_project}/{lib_pkg}/upload",
                    files=files,
                    data={"tag": "1.0.0"},
                )
                assert response.status_code == 200

            # App depends on both
            ensure_app = yaml.dump({
                "dependencies": [
                    {"project": test_project, "package": pkg_lib_a, "version": "1.0.0"},
                    {"project": test_project, "package": pkg_lib_b, "version": "1.0.0"},
                ]
            })
            content_app = unique_content("app", unique_test_id, "noconflict")
            files = {
                "file": ("app.tar.gz", BytesIO(content_app), "application/gzip"),
                "ensure": ("orchard.ensure", BytesIO(ensure_app.encode()), "application/x-yaml"),
            }
            response = integration_client.post(
                f"/api/v1/project/{test_project}/{pkg_app}/upload",
                files=files,
                data={"tag": "1.0.0"},
            )
            assert response.status_code == 200

            # Resolution should succeed (no conflict)
            response = integration_client.get(
                f"/api/v1/project/{test_project}/{pkg_app}/+/1.0.0/resolve"
            )
            assert response.status_code == 200
            data = response.json()
            # common should appear only once
            packages = [r["package"] for r in data["resolved"]]
            assert packages.count(pkg_common) == 1

        finally:
            for pkg in [pkg_app, pkg_lib_a, pkg_lib_b, pkg_common]:
                integration_client.delete(f"/api/v1/project/{test_project}/packages/{pkg}")