import pytest
from unittest.mock import MagicMock
import ai_client

def test_ai_client_event_emitter_exists():
    # This should fail initially because 'events' won't exist on ai_client
    assert hasattr(ai_client, 'events')
    assert ai_client.events is not None

def test_event_emission():
    # We'll expect these event names based on the spec
    mock_callback = MagicMock()
    ai_client.events.on("request_start", mock_callback)
    
    # Trigger something that should emit the event (once implemented)
    # For now, we just test the emitter itself if we were to call it manually
    ai_client.events.emit("request_start", payload={"model": "test"})
    
    mock_callback.assert_called_once_with(payload={"model": "test"})

def test_send_emits_events():
    from unittest.mock import patch, MagicMock
    
    # We need to mock _ensure_gemini_client and the chat object it creates
    with patch("ai_client._ensure_gemini_client"), \
         patch("ai_client._gemini_client") as mock_client, \
         patch("ai_client._gemini_chat") as mock_chat:
        
        # Setup mock response
        mock_response = MagicMock()
        mock_response.candidates = []
        # Explicitly set usage_metadata as a mock with integer values
        mock_usage = MagicMock()
        mock_usage.prompt_token_count = 10
        mock_usage.candidates_token_count = 5
        mock_usage.cached_content_token_count = None
        mock_response.usage_metadata = mock_usage
        mock_chat.send_message.return_value = mock_response
        mock_client.chats.create.return_value = mock_chat
        
        ai_client.set_provider("gemini", "gemini-flash")
        
        start_callback = MagicMock()
        response_callback = MagicMock()
        
        ai_client.events.on("request_start", start_callback)
        ai_client.events.on("response_received", response_callback)
        
        # We need to bypass the context changed check or set it up
        ai_client.send("context", "message")
        
        assert start_callback.called
        assert response_callback.called
        
        # Check payload
        args, kwargs = start_callback.call_args
        assert kwargs['payload']['provider'] == 'gemini'
        
def test_send_emits_tool_events():
    from unittest.mock import patch, MagicMock
    
    with patch("ai_client._ensure_gemini_client"), \
         patch("ai_client._gemini_client") as mock_client, \
         patch("ai_client._gemini_chat") as mock_chat, \
         patch("mcp_client.dispatch") as mock_dispatch:
        
        # 1. Setup mock response with a tool call
        mock_fc = MagicMock()
        mock_fc.name = "read_file"
        mock_fc.args = {"path": "test.txt"}
        
        mock_response_with_tool = MagicMock()
        mock_response_with_tool.candidates = [MagicMock()]
        mock_part = MagicMock()
        mock_part.text = "tool call text"
        mock_part.function_call = mock_fc
        mock_response_with_tool.candidates[0].content.parts = [mock_part]
        mock_response_with_tool.candidates[0].finish_reason.name = "STOP"
        
        # Setup mock usage
        mock_usage = MagicMock()
        mock_usage.prompt_token_count = 10
        mock_usage.candidates_token_count = 5
        mock_usage.cached_content_token_count = None
        mock_response_with_tool.usage_metadata = mock_usage
        
        # 2. Setup second mock response (final answer)
        mock_response_final = MagicMock()
        mock_response_final.candidates = []
        mock_response_final.usage_metadata = mock_usage
        
        mock_chat.send_message.side_effect = [mock_response_with_tool, mock_response_final]
        mock_dispatch.return_value = "file content"
        
        ai_client.set_provider("gemini", "gemini-flash")
        
        tool_callback = MagicMock()
        ai_client.events.on("tool_execution", tool_callback)
        
        ai_client.send("context", "message")
        
        # Should be called twice: once for 'started', once for 'completed'
        assert tool_callback.call_count == 2
        
        # Check 'started' call
        args, kwargs = tool_callback.call_args_list[0]
        assert kwargs['payload']['status'] == 'started'
        assert kwargs['payload']['tool'] == 'read_file'
        
        # Check 'completed' call
        args, kwargs = tool_callback.call_args_list[1]
        assert kwargs['payload']['status'] == 'completed'
        assert kwargs['payload']['result'] == 'file content'