"""Tests for /title gateway slash command.

Tests the _handle_title_command handler (set/show session titles)
across all gateway messenger platforms.
"""

import os
from unittest.mock import MagicMock, patch

import pytest

from gateway.config import Platform
from gateway.platforms.base import MessageEvent
from gateway.session import SessionSource


def _make_event(text="/title", platform=Platform.TELEGRAM,
                user_id="12345", chat_id="67890"):
    """Build a MessageEvent for testing."""
    source = SessionSource(
        platform=platform,
        user_id=user_id,
        chat_id=chat_id,
        user_name="testuser",
    )
    return MessageEvent(text=text, source=source)


def _make_runner(session_db=None):
    """Create a bare GatewayRunner with a mock session_store and optional session_db."""
    from gateway.run import GatewayRunner
    runner = object.__new__(GatewayRunner)
    runner.adapters = {}
    runner._session_db = session_db

    # Mock session_store that returns a session entry with a known session_id
    mock_session_entry = MagicMock()
    mock_session_entry.session_id = "test_session_123"
    mock_session_entry.session_key = "telegram:12345:67890"
    mock_store = MagicMock()
    mock_store.get_or_create_session.return_value = mock_session_entry
    runner.session_store = mock_store

    return runner


# ---------------------------------------------------------------------------
# _handle_title_command
# ---------------------------------------------------------------------------


class TestHandleTitleCommand:
    """Tests for GatewayRunner._handle_title_command."""

    @pytest.mark.asyncio
    async def test_set_title(self, tmp_path):
        """Setting a title returns confirmation."""
        from hermes_state import SessionDB
        db = SessionDB(db_path=tmp_path / "state.db")
        db.create_session("test_session_123", "telegram")

        runner = _make_runner(session_db=db)
        event = _make_event(text="/title My Research Project")
        result = await runner._handle_title_command(event)
        assert "My Research Project" in result
        assert "✏️" in result

        # Verify in DB
        assert db.get_session_title("test_session_123") == "My Research Project"
        db.close()

    @pytest.mark.asyncio
    async def test_show_title_when_set(self, tmp_path):
        """Showing title when one is set returns the title."""
        from hermes_state import SessionDB
        db = SessionDB(db_path=tmp_path / "state.db")
        db.create_session("test_session_123", "telegram")
        db.set_session_title("test_session_123", "Existing Title")

        runner = _make_runner(session_db=db)
        event = _make_event(text="/title")
        result = await runner._handle_title_command(event)
        assert "Existing Title" in result
        assert "📌" in result
        db.close()

    @pytest.mark.asyncio
    async def test_show_title_when_not_set(self, tmp_path):
        """Showing title when none is set returns usage hint."""
        from hermes_state import SessionDB
        db = SessionDB(db_path=tmp_path / "state.db")
        db.create_session("test_session_123", "telegram")

        runner = _make_runner(session_db=db)
        event = _make_event(text="/title")
        result = await runner._handle_title_command(event)
        assert "No title set" in result
        assert "/title" in result
        db.close()

    @pytest.mark.asyncio
    async def test_title_conflict(self, tmp_path):
        """Setting a title already used by another session returns error."""
        from hermes_state import SessionDB
        db = SessionDB(db_path=tmp_path / "state.db")
        db.create_session("other_session", "telegram")
        db.set_session_title("other_session", "Taken Title")
        db.create_session("test_session_123", "telegram")

        runner = _make_runner(session_db=db)
        event = _make_event(text="/title Taken Title")
        result = await runner._handle_title_command(event)
        assert "already in use" in result
        assert "⚠️" in result
        db.close()

    @pytest.mark.asyncio
    async def test_no_session_db(self):
        """Returns error when session database is not available."""
        runner = _make_runner(session_db=None)
        event = _make_event(text="/title My Title")
        result = await runner._handle_title_command(event)
        assert "not available" in result

    @pytest.mark.asyncio
    async def test_title_too_long(self, tmp_path):
        """Setting a title that exceeds max length returns error."""
        from hermes_state import SessionDB
        db = SessionDB(db_path=tmp_path / "state.db")
        db.create_session("test_session_123", "telegram")

        runner = _make_runner(session_db=db)
        long_title = "A" * 150
        event = _make_event(text=f"/title {long_title}")
        result = await runner._handle_title_command(event)
        assert "too long" in result
        assert "⚠️" in result
        db.close()

    @pytest.mark.asyncio
    async def test_title_control_chars_sanitized(self, tmp_path):
        """Control characters are stripped and sanitized title is stored."""
        from hermes_state import SessionDB
        db = SessionDB(db_path=tmp_path / "state.db")
        db.create_session("test_session_123", "telegram")

        runner = _make_runner(session_db=db)
        event = _make_event(text="/title hello\x00world")
        result = await runner._handle_title_command(event)
        assert "helloworld" in result
        assert db.get_session_title("test_session_123") == "helloworld"
        db.close()

    @pytest.mark.asyncio
    async def test_title_only_control_chars(self, tmp_path):
        """Title with only control chars returns empty error."""
        from hermes_state import SessionDB
        db = SessionDB(db_path=tmp_path / "state.db")
        db.create_session("test_session_123", "telegram")

        runner = _make_runner(session_db=db)
        event = _make_event(text="/title \x00\x01\x02")
        result = await runner._handle_title_command(event)
        assert "empty after cleanup" in result
        db.close()

    @pytest.mark.asyncio
    async def test_works_across_platforms(self, tmp_path):
        """The /title command works for Discord, Slack, and WhatsApp too."""
        from hermes_state import SessionDB
        for platform in [Platform.DISCORD, Platform.TELEGRAM]:
            db = SessionDB(db_path=tmp_path / f"state_{platform.value}.db")
            db.create_session("test_session_123", platform.value)

            runner = _make_runner(session_db=db)
            event = _make_event(text="/title Cross-Platform Test", platform=platform)
            result = await runner._handle_title_command(event)
            assert "Cross-Platform Test" in result
            assert db.get_session_title("test_session_123") == "Cross-Platform Test"
            db.close()


# ---------------------------------------------------------------------------
# /title in help and known_commands
# ---------------------------------------------------------------------------


class TestTitleInHelp:
    """Verify /title appears in help text and known commands."""

    @pytest.mark.asyncio
    async def test_title_in_help_output(self):
        """The /help output includes /title."""
        runner = _make_runner()
        event = _make_event(text="/help")
        # Need hooks for help command
        from gateway.hooks import HookRegistry
        runner.hooks = HookRegistry()
        result = await runner._handle_help_command(event)
        assert "/title" in result

    def test_title_is_known_command(self):
        """The /title command is in the _known_commands set."""
        from gateway.run import GatewayRunner
        import inspect
        source = inspect.getsource(GatewayRunner._handle_message)
        assert '"title"' in source