issue-core/tests/test_local_backend.py

"""
Test suite for Local SQLite Backend functionality.

These tests ensure the local backend correctly implements the IssueBackend interface
and provides reliable offline issue tracking.
"""

import pytest
import tempfile
from datetime import datetime, timezone, timedelta
from pathlib import Path

from issue_tracker.backends.local.backend import LocalSQLiteBackend
from issue_tracker.core.models import Issue, Label, User, Milestone, Comment, IssueState
from issue_tracker.core.interfaces import IssueFilter


@pytest.mark.unit
class TestLocalBackendInitialization:
    """Test local backend initialization and connection."""

    def test_backend_initialization(self):
        """Test backend initializes with correct type and capabilities."""
        backend = LocalSQLiteBackend()

        assert backend.backend_type == "local"
        assert backend.capabilities.supports_milestones
        assert backend.capabilities.supports_assignees
        assert backend.capabilities.supports_comments
        assert backend.capabilities.supports_labels
        assert backend.capabilities.supports_search
        assert backend.capabilities.supports_bulk_operations
        assert not backend.capabilities.supports_webhooks
        assert not backend.capabilities.supports_real_time

    def test_connect_creates_database(self):
        """Test connect creates database file and schema."""
        with tempfile.TemporaryDirectory() as tmpdir:
            db_path = Path(tmpdir) / "test.db"
            backend = LocalSQLiteBackend()

            backend.connect({'db_path': str(db_path)})

            assert db_path.exists()
            assert backend.connection is not None
            assert backend.test_connection()

            backend.disconnect()

    def test_disconnect_closes_connection(self):
        """Test disconnect properly closes database connection."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})

            backend.disconnect()

            assert backend.connection is None
            assert not backend.test_connection()

    def test_schema_initialization(self):
        """Test database schema is properly initialized."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})

            # Verify tables exist
            cursor = backend.connection.execute(
                "SELECT name FROM sqlite_master WHERE type='table'"
            )
            tables = {row[0] for row in cursor.fetchall()}

            expected_tables = {
                'issues', 'labels', 'users', 'milestones', 'comments',
                'issue_labels', 'issue_assignees', 'sync_history'
            }

            assert expected_tables.issubset(tables)

            backend.disconnect()


@pytest.mark.unit
class TestIssueCRUD:
    """Test issue CRUD operations."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})
            yield backend
            backend.disconnect()

    def test_create_issue(self, backend):
        """Test creating a new issue."""
        issue = Issue(
            id=None,
            number=0,
            title="Test Issue",
            description="Test description",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )

        created = backend.create_issue(issue)

        assert created.id is not None
        assert created.number == 1
        assert created.title == "Test Issue"
        assert created.description == "Test description"
        assert created.state == IssueState.OPEN

    def test_create_multiple_issues_increments_numbers(self, backend):
        """Test issue numbers increment correctly."""
        issue1 = Issue(
            id=None, number=0, title="Issue 1", description="Desc 1",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )
        issue2 = Issue(
            id=None, number=0, title="Issue 2", description="Desc 2",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )

        created1 = backend.create_issue(issue1)
        created2 = backend.create_issue(issue2)

        assert created1.number == 1
        assert created2.number == 2

    def test_get_issue_by_id(self, backend):
        """Test retrieving issue by ID."""
        issue = Issue(
            id=None, number=0, title="Test", description="Desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )
        created = backend.create_issue(issue)

        retrieved = backend.get_issue(created.id)

        assert retrieved is not None
        assert retrieved.id == created.id
        assert retrieved.title == "Test"

    def test_get_issue_by_number(self, backend):
        """Test retrieving issue by number."""
        issue = Issue(
            id=None, number=0, title="Test", description="Desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )
        created = backend.create_issue(issue)

        retrieved = backend.get_issue_by_number(created.number)

        assert retrieved is not None
        assert retrieved.number == created.number
        assert retrieved.title == "Test"

    def test_get_nonexistent_issue_returns_none(self, backend):
        """Test getting non-existent issue returns None."""
        assert backend.get_issue("nonexistent-id") is None
        assert backend.get_issue_by_number(999) is None

    def test_update_issue(self, backend):
        """Test updating an existing issue."""
        issue = Issue(
            id=None, number=0, title="Original", description="Original desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )
        created = backend.create_issue(issue)

        created.title = "Updated"
        created.description = "Updated desc"
        created.state = IssueState.CLOSED
        created.closed_at = datetime.now(timezone.utc)

        updated = backend.update_issue(created)

        assert updated.title == "Updated"
        assert updated.description == "Updated desc"
        assert updated.state == IssueState.CLOSED

        # Verify changes persisted
        retrieved = backend.get_issue(created.id)
        assert retrieved.title == "Updated"

    def test_delete_issue(self, backend):
        """Test deleting an issue."""
        issue = Issue(
            id=None, number=0, title="To Delete", description="Desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )
        created = backend.create_issue(issue)

        result = backend.delete_issue(created.id)

        assert result is True
        assert backend.get_issue(created.id) is None

    def test_delete_nonexistent_issue_returns_false(self, backend):
        """Test deleting non-existent issue returns False."""
        result = backend.delete_issue("nonexistent-id")
        assert result is False


@pytest.mark.unit
class TestIssueWithLabels:
    """Test issue operations with labels."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})
            yield backend
            backend.disconnect()

    def test_create_issue_with_labels(self, backend):
        """Test creating issue with labels."""
        labels = [
            Label(name="bug", color="red", description="Bug reports"),
            Label(name="priority:high", color="orange")
        ]

        issue = Issue(
            id=None, number=0, title="Bug Report", description="Desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc),
            labels=labels
        )

        created = backend.create_issue(issue)
        retrieved = backend.get_issue(created.id)

        assert len(retrieved.labels) == 2
        assert any(l.name == "bug" for l in retrieved.labels)
        assert any(l.name == "priority:high" for l in retrieved.labels)

    def test_update_issue_labels(self, backend):
        """Test updating issue labels."""
        issue = Issue(
            id=None, number=0, title="Test", description="Desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc),
            labels=[Label(name="bug")]
        )
        created = backend.create_issue(issue)

        # Update labels
        created.labels = [
            Label(name="bug"),
            Label(name="enhancement"),
            Label(name="priority:low")
        ]
        backend.update_issue(created)

        retrieved = backend.get_issue(created.id)
        assert len(retrieved.labels) == 3


@pytest.mark.unit
class TestIssueWithAssignees:
    """Test issue operations with assignees."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})
            yield backend
            backend.disconnect()

    def test_create_issue_with_assignees(self, backend):
        """Test creating issue with assignees."""
        assignees = [
            User(id="user1", username="alice", display_name="Alice"),
            User(id="user2", username="bob", display_name="Bob")
        ]

        issue = Issue(
            id=None, number=0, title="Assigned Issue", description="Desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc),
            assignees=assignees
        )

        created = backend.create_issue(issue)
        retrieved = backend.get_issue(created.id)

        assert len(retrieved.assignees) == 2
        assert any(u.username == "alice" for u in retrieved.assignees)
        assert any(u.username == "bob" for u in retrieved.assignees)


@pytest.mark.unit
class TestIssueWithMilestone:
    """Test issue operations with milestones."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})
            yield backend
            backend.disconnect()

    def test_create_issue_with_milestone(self, backend):
        """Test creating issue with milestone."""
        milestone = Milestone(
            id=None,
            title="v1.0",
            description="First release",
            state="open",
            due_date=datetime.now(timezone.utc) + timedelta(days=30)
        )
        created_milestone = backend.create_milestone(milestone)

        issue = Issue(
            id=None, number=0, title="Feature", description="Desc",
            state=IssueState.OPEN,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc),
            milestone=created_milestone
        )

        created_issue = backend.create_issue(issue)
        retrieved = backend.get_issue(created_issue.id)

        assert retrieved.milestone is not None
        assert retrieved.milestone.title == "v1.0"


@pytest.mark.unit
class TestListAndFilter:
    """Test listing and filtering issues."""

    @pytest.fixture
    def backend(self):
        """Create backend with sample data."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})

            # Create sample issues
            backend.create_issue(Issue(
                id=None, number=0, title="Open Bug", description="Bug desc",
                state=IssueState.OPEN,
                created_at=datetime.now(timezone.utc),
                updated_at=datetime.now(timezone.utc),
                labels=[Label(name="bug")]
            ))

            backend.create_issue(Issue(
                id=None, number=0, title="Closed Feature", description="Feature desc",
                state=IssueState.CLOSED,
                created_at=datetime.now(timezone.utc),
                updated_at=datetime.now(timezone.utc),
                closed_at=datetime.now(timezone.utc),
                labels=[Label(name="enhancement")]
            ))

            backend.create_issue(Issue(
                id=None, number=0, title="In Progress Task", description="Task desc",
                state=IssueState.IN_PROGRESS,
                created_at=datetime.now(timezone.utc),
                updated_at=datetime.now(timezone.utc)
            ))

            yield backend
            backend.disconnect()

    def test_list_all_issues(self, backend):
        """Test listing all issues."""
        issues = backend.list_issues()
        assert len(issues) == 3

    def test_filter_by_state_open(self, backend):
        """Test filtering by open state."""
        filter_criteria = IssueFilter(state="open")
        issues = backend.list_issues(filter_criteria)
        assert len(issues) == 1
        assert issues[0].state == IssueState.OPEN

    def test_filter_by_state_closed(self, backend):
        """Test filtering by closed state."""
        filter_criteria = IssueFilter(state="closed")
        issues = backend.list_issues(filter_criteria)
        assert len(issues) == 1
        assert issues[0].state == IssueState.CLOSED

    def test_search_issues(self, backend):
        """Test searching issues by text."""
        filter_criteria = IssueFilter(search="Bug")
        issues = backend.list_issues(filter_criteria)
        assert len(issues) == 1
        assert "Bug" in issues[0].title

    def test_search_issues_method(self, backend):
        """Test search_issues method."""
        issues = backend.search_issues("Feature")
        assert len(issues) == 1
        assert "Feature" in issues[0].title

    def test_filter_with_limit(self, backend):
        """Test filtering with limit."""
        filter_criteria = IssueFilter(limit=2)
        issues = backend.list_issues(filter_criteria)
        assert len(issues) == 2

    def test_filter_with_offset(self, backend):
        """Test filtering with offset and limit."""
        filter_criteria = IssueFilter(limit=2, offset=1)
        issues = backend.list_issues(filter_criteria)
        assert len(issues) == 2


@pytest.mark.unit
class TestLabelOperations:
    """Test label management operations."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})
            yield backend
            backend.disconnect()

    def test_create_label(self, backend):
        """Test creating a label."""
        label = Label(name="bug", color="red", description="Bug reports")
        created = backend.create_label(label)

        assert created.name == "bug"
        assert created.color == "red"

    def test_get_labels(self, backend):
        """Test getting all labels."""
        backend.create_label(Label(name="bug", color="red"))
        backend.create_label(Label(name="enhancement", color="blue"))

        labels = backend.get_labels()
        assert len(labels) == 2

    def test_update_label(self, backend):
        """Test updating a label."""
        label = Label(name="bug", color="red", description="Old desc")
        backend.create_label(label)

        # Create new label with updated values (Label is frozen/immutable)
        updated_label = Label(name="bug", color="orange", description="New desc")
        backend.update_label(updated_label)

        labels = backend.get_labels()
        bug_label = next(l for l in labels if l.name == "bug")
        assert bug_label.color == "orange"
        assert bug_label.description == "New desc"

    def test_delete_label(self, backend):
        """Test deleting a label."""
        backend.create_label(Label(name="bug", color="red"))

        result = backend.delete_label("bug")
        assert result is True

        labels = backend.get_labels()
        assert len(labels) == 0


@pytest.mark.unit
class TestUserOperations:
    """Test user management operations."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})

            # Create test users
            backend.connection.execute("""
                INSERT INTO users (id, username, display_name, email)
                VALUES (?, ?, ?, ?)
            """, ("user1", "alice", "Alice Smith", "alice@example.com"))
            backend.connection.execute("""
                INSERT INTO users (id, username, display_name, email)
                VALUES (?, ?, ?, ?)
            """, ("user2", "bob", "Bob Jones", "bob@example.com"))
            backend.connection.commit()

            yield backend
            backend.disconnect()

    def test_get_users(self, backend):
        """Test getting all users."""
        users = backend.get_users()
        assert len(users) == 2

    def test_get_user_by_id(self, backend):
        """Test getting user by ID."""
        user = backend.get_user("user1")
        assert user is not None
        assert user.username == "alice"

    def test_search_users(self, backend):
        """Test searching users."""
        users = backend.search_users("alice")
        assert len(users) == 1
        assert users[0].username == "alice"


@pytest.mark.unit
class TestMilestoneOperations:
    """Test milestone management operations."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})
            yield backend
            backend.disconnect()

    def test_create_milestone(self, backend):
        """Test creating a milestone."""
        milestone = Milestone(
            id=None,
            title="v1.0",
            description="First release",
            state="open",
            due_date=datetime.now(timezone.utc) + timedelta(days=30)
        )

        created = backend.create_milestone(milestone)
        assert created.id is not None
        assert created.title == "v1.0"

    def test_get_milestones(self, backend):
        """Test getting all milestones."""
        backend.create_milestone(Milestone(id=None, title="v1.0", state="open"))
        backend.create_milestone(Milestone(id=None, title="v2.0", state="open"))

        milestones = backend.get_milestones()
        assert len(milestones) == 2

    def test_update_milestone(self, backend):
        """Test updating a milestone."""
        milestone = Milestone(id=None, title="v1.0", description="Old", state="open")
        created = backend.create_milestone(milestone)

        created.description = "Updated"
        created.state = "closed"
        backend.update_milestone(created)

        milestones = backend.get_milestones()
        updated = next(m for m in milestones if m.id == created.id)
        assert updated.description == "Updated"
        assert updated.state == "closed"

    def test_delete_milestone(self, backend):
        """Test deleting a milestone."""
        milestone = Milestone(id=None, title="v1.0", state="open")
        created = backend.create_milestone(milestone)

        result = backend.delete_milestone(created.id)
        assert result is True

        milestones = backend.get_milestones()
        assert len(milestones) == 0


@pytest.mark.unit
class TestCommentOperations:
    """Test comment operations."""

    @pytest.fixture
    def backend(self):
        """Create backend with an issue."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})

            # Create test issue
            issue = Issue(
                id=None, number=0, title="Test", description="Desc",
                state=IssueState.OPEN,
                created_at=datetime.now(timezone.utc),
                updated_at=datetime.now(timezone.utc)
            )
            backend.create_issue(issue)

            yield backend
            backend.disconnect()

    def test_add_comment(self, backend):
        """Test adding a comment to an issue."""
        issue = backend.get_issue_by_number(1)
        author = User(id="user1", username="alice")

        comment = Comment(
            id=None,
            body="Great issue!",
            author=author,
            created_at=datetime.now(timezone.utc)
        )

        created = backend.add_comment(issue.id, comment)
        assert created.id is not None
        assert created.body == "Great issue!"

    def test_get_comments(self, backend):
        """Test getting comments for an issue."""
        issue = backend.get_issue_by_number(1)
        author = User(id="user1", username="alice")

        comment1 = Comment(
            id=None, body="First comment", author=author,
            created_at=datetime.now(timezone.utc)
        )
        comment2 = Comment(
            id=None, body="Second comment", author=author,
            created_at=datetime.now(timezone.utc)
        )

        backend.add_comment(issue.id, comment1)
        backend.add_comment(issue.id, comment2)

        comments = backend.get_comments(issue.id)
        assert len(comments) == 2
        assert comments[0].body == "First comment"

    def test_update_comment(self, backend):
        """Test updating a comment."""
        issue = backend.get_issue_by_number(1)
        author = User(id="user1", username="alice")

        comment = Comment(
            id=None, body="Original", author=author,
            created_at=datetime.now(timezone.utc)
        )
        created = backend.add_comment(issue.id, comment)

        created.body = "Updated"
        backend.update_comment(created)

        comments = backend.get_comments(issue.id)
        assert comments[0].body == "Updated"

    def test_delete_comment(self, backend):
        """Test deleting a comment."""
        issue = backend.get_issue_by_number(1)
        author = User(id="user1", username="alice")

        comment = Comment(
            id=None, body="To delete", author=author,
            created_at=datetime.now(timezone.utc)
        )
        created = backend.add_comment(issue.id, comment)

        result = backend.delete_comment(created.id)
        assert result is True

        comments = backend.get_comments(issue.id)
        assert len(comments) == 0


@pytest.mark.unit
class TestSyncOperations:
    """Test synchronization support."""

    @pytest.fixture
    def backend(self):
        """Create a temporary backend for each test."""
        with tempfile.TemporaryDirectory() as tmpdir:
            backend = LocalSQLiteBackend()
            backend.connect({'db_path': str(Path(tmpdir) / "test.db")})
            yield backend
            backend.disconnect()

    def test_finalize_sync_logs_success(self, backend):
        """Test successful sync is logged."""
        backend.finalize_sync(success=True)

        cursor = backend.connection.execute(
            "SELECT * FROM sync_history WHERE success = 1"
        )
        rows = cursor.fetchall()
        assert len(rows) == 1

    def test_get_issues_modified_since(self, backend):
        """Test getting issues modified after a timestamp."""
        old_time = datetime.now(timezone.utc) - timedelta(hours=2)

        # Create issue before timestamp
        issue1 = Issue(
            id=None, number=0, title="Old", description="Desc",
            state=IssueState.OPEN,
            created_at=old_time,
            updated_at=old_time
        )
        backend.create_issue(issue1)

        # Create issue after timestamp
        new_time = datetime.now(timezone.utc)
        issue2 = Issue(
            id=None, number=0, title="New", description="Desc",
            state=IssueState.OPEN,
            created_at=new_time,
            updated_at=new_time
        )
        backend.create_issue(issue2)

        # Get issues modified since 1 hour ago
        since_time = datetime.now(timezone.utc) - timedelta(hours=1)
        modified_issues = backend.get_issues_modified_since(since_time)

        assert len(modified_issues) == 1
        assert modified_issues[0].title == "New"

    def test_get_sync_conflicts_returns_empty(self, backend):
        """Test local backend has no sync conflicts."""
        conflicts = backend.get_sync_conflicts()
        assert conflicts == []

    def test_prepare_for_sync(self, backend):
        """Test prepare_for_sync doesn't fail."""
        # Should not raise
        backend.prepare_for_sync()