"""
Unit tests for AI summarization with mock Dify responses.
"""

import pytest
from unittest.mock import patch, MagicMock, AsyncMock
import json

pytestmark = pytest.mark.asyncio


class TestDifyResponseParsing:
    """Tests for parsing Dify LLM responses."""

    def test_parse_json_response(self):
        """Test parsing valid JSON response from Dify."""
        from app.routers.ai import parse_dify_response

        response = '''Here is the summary:
```json
{
    "conclusions": ["Agreed on Q1 budget", "New hire approved"],
    "action_items": [
        {"content": "Submit budget report", "owner": "John", "due_date": "2025-01-15"},
        {"content": "Post job listing", "owner": "", "due_date": null}
    ]
}
```
'''
        result = parse_dify_response(response)

        assert len(result["conclusions"]) == 2
        assert "Q1 budget" in result["conclusions"][0]
        assert len(result["action_items"]) == 2
        assert result["action_items"][0]["owner"] == "John"

    def test_parse_inline_json_response(self):
        """Test parsing inline JSON without code blocks."""
        from app.routers.ai import parse_dify_response

        response = '{"conclusions": ["Budget approved"], "action_items": []}'
        result = parse_dify_response(response)

        assert len(result["conclusions"]) == 1
        assert result["conclusions"][0] == "Budget approved"

    def test_parse_non_json_response(self):
        """Test fallback when response is not JSON."""
        from app.routers.ai import parse_dify_response

        response = "The meeting discussed Q1 budget and hiring plans."
        result = parse_dify_response(response)

        # Should return the raw response as a single conclusion
        assert len(result["conclusions"]) == 1
        assert "Q1 budget" in result["conclusions"][0]
        assert len(result["action_items"]) == 0

    def test_parse_empty_response(self):
        """Test handling empty response."""
        from app.routers.ai import parse_dify_response

        result = parse_dify_response("")

        assert result["conclusions"] == []
        assert result["action_items"] == []


class TestSummarizeEndpoint:
    """Tests for the AI summarization endpoint."""

    @patch("app.routers.ai.httpx.AsyncClient")
    @patch("app.routers.ai.settings")
    async def test_summarize_success(self, mock_settings, mock_client_class):
        """Test successful summarization."""
        mock_settings.DIFY_API_URL = "https://dify.test.com/v1"
        mock_settings.DIFY_API_KEY = "test-key"

        mock_response = MagicMock()
        mock_response.status_code = 200
        mock_response.json.return_value = {
            "answer": json.dumps({
                "conclusions": ["Decision made"],
                "action_items": [{"content": "Follow up", "owner": "Alice", "due_date": "2025-01-20"}]
            })
        }

        mock_client = AsyncMock()
        mock_client.post.return_value = mock_response
        mock_client.__aenter__.return_value = mock_client
        mock_client.__aexit__.return_value = None
        mock_client_class.return_value = mock_client

        from app.routers.ai import summarize_transcript
        from app.models import SummarizeRequest, TokenPayload

        mock_user = TokenPayload(email="test@test.com", role="user")
        result = await summarize_transcript(
            SummarizeRequest(transcript="Test meeting transcript"),
            current_user=mock_user
        )

        assert len(result.conclusions) == 1
        assert len(result.action_items) == 1
        assert result.action_items[0].owner == "Alice"

    @patch("app.routers.ai.httpx.AsyncClient")
    @patch("app.routers.ai.settings")
    async def test_summarize_handles_timeout(self, mock_settings, mock_client_class):
        """Test handling Dify timeout."""
        import httpx
        from fastapi import HTTPException

        mock_settings.DIFY_API_URL = "https://dify.test.com/v1"
        mock_settings.DIFY_API_KEY = "test-key"

        mock_client = AsyncMock()
        mock_client.post.side_effect = httpx.TimeoutException("Timeout")
        mock_client.__aenter__.return_value = mock_client
        mock_client.__aexit__.return_value = None
        mock_client_class.return_value = mock_client

        from app.routers.ai import summarize_transcript
        from app.models import SummarizeRequest, TokenPayload

        mock_user = TokenPayload(email="test@test.com", role="user")

        with pytest.raises(HTTPException) as exc_info:
            await summarize_transcript(
                SummarizeRequest(transcript="Test"),
                current_user=mock_user
            )

        assert exc_info.value.status_code == 504

    @patch("app.routers.ai.settings")
    async def test_summarize_no_api_key(self, mock_settings):
        """Test error when Dify API key is not configured."""
        from fastapi import HTTPException

        mock_settings.DIFY_API_KEY = ""

        from app.routers.ai import summarize_transcript
        from app.models import SummarizeRequest, TokenPayload

        mock_user = TokenPayload(email="test@test.com", role="user")

        with pytest.raises(HTTPException) as exc_info:
            await summarize_transcript(
                SummarizeRequest(transcript="Test"),
                current_user=mock_user
            )

        assert exc_info.value.status_code == 503


class TestPartialDataHandling:
    """Tests for handling partial data from AI."""

    def test_action_item_with_empty_owner(self):
        """Test action items with empty owner are handled."""
        from app.routers.ai import parse_dify_response

        response = json.dumps({
            "conclusions": [],
            "action_items": [
                {"content": "Task 1", "owner": "", "due_date": None},
                {"content": "Task 2", "owner": "Bob", "due_date": "2025-02-01"}
            ]
        })

        result = parse_dify_response(response)

        assert result["action_items"][0]["owner"] == ""
        assert result["action_items"][1]["owner"] == "Bob"

    def test_action_item_with_missing_fields(self):
        """Test action items with missing fields."""
        from app.routers.ai import parse_dify_response

        response = json.dumps({
            "conclusions": ["Done"],
            "action_items": [
                {"content": "Task only"}
            ]
        })

        result = parse_dify_response(response)

        # Should have content but other fields may be missing
        assert result["action_items"][0]["content"] == "Task only"