from unittest.mock import patch, MagicMock
from src import ai_client
import json
import pytest

def test_deepseek_model_selection() -> None:
 """
    Verifies that ai_client.set_provider('deepseek', 'deepseek-chat') correctly updates the internal state.
    """
 ai_client.set_provider("deepseek", "deepseek-chat")
 assert ai_client._provider == "deepseek"
 assert ai_client._model == "deepseek-chat"

@patch("requests.post")
def test_deepseek_completion_logic(mock_post: MagicMock) -> None:
 """
    Verifies that ai_client.send() correctly calls the DeepSeek API and returns content.
    """
 ai_client.set_provider("deepseek", "deepseek-chat")
 with patch("src.ai_client._load_credentials", return_value={"deepseek": {"api_key": "test-key"}}):
  mock_response = MagicMock()
  mock_response.status_code = 200
  mock_response.json.return_value = {
   "choices": [{"message": {"content": "Hello World"}, "finish_reason": "stop"}]
  }
  mock_post.return_value = mock_response
  
  result = ai_client.send(md_content="Context", user_message="Hi", base_dir=".")
  assert result == "Hello World"
  assert mock_post.called

@patch("requests.post")
def test_deepseek_reasoning_logic(mock_post: MagicMock) -> None:
 """
    Verifies that reasoning_content is captured and wrapped in <thinking> tags.
    """
 ai_client.set_provider("deepseek", "deepseek-reasoner")
 with patch("src.ai_client._load_credentials", return_value={"deepseek": {"api_key": "test-key"}}):
  mock_response = MagicMock()
  mock_response.status_code = 200
  mock_response.json.return_value = {
   "choices": [{
    "message": {"content": "Final answer", "reasoning_content": "Chain of thought"},
    "finish_reason": "stop"
   }]
  }
  mock_post.return_value = mock_response
  
  result = ai_client.send(md_content="Context", user_message="Hi", base_dir=".")
  assert "<thinking>\nChain of thought\n</thinking>" in result
  assert "Final answer" in result

@patch("requests.post")
def test_deepseek_tool_calling(mock_post: MagicMock) -> None:
 """
    Verifies that DeepSeek provider correctly identifies and executes tool calls.
    """
 ai_client.set_provider("deepseek", "deepseek-chat")
 with patch("src.ai_client._load_credentials", return_value={"deepseek": {"api_key": "test-key"}}), \
   patch("src.mcp_client.dispatch") as mock_dispatch:
  
  # Round 1: Model calls a tool
  mock_resp1 = MagicMock()
  mock_resp1.status_code = 200
  mock_resp1.json.return_value = {
   "choices": [{
    "message": {
     "content": "I will read the file",
     "tool_calls": [{
      "id": "call_1",
      "type": "function",
      "function": {"name": "read_file", "arguments": '{"path": "test.txt"}'}
     }]
    },
    "finish_reason": "tool_calls"
   }]
  }
  
  # Round 2: Model provides final answer
  mock_resp2 = MagicMock()
  mock_resp2.status_code = 200
  mock_resp2.json.return_value = {
   "choices": [{"message": {"content": "File content is: Hello World"}, "finish_reason": "stop"}]
  }
  
  mock_post.side_effect = [mock_resp1, mock_resp2]
  mock_dispatch.return_value = "Hello World"
  
  result = ai_client.send(md_content="Context", user_message="Read test.txt", base_dir=".")
  assert "File content is: Hello World" in result
  assert mock_dispatch.called
  mock_dispatch.assert_called_with("read_file", {"path": "test.txt"})

@patch("requests.post")
def test_deepseek_streaming(mock_post: MagicMock) -> None:
 """
    Verifies that DeepSeek provider correctly aggregates streaming chunks.
    """
 ai_client.set_provider("deepseek", "deepseek-chat")
 with patch("src.ai_client._load_credentials", return_value={"deepseek": {"api_key": "test-key"}}):
  mock_response = MagicMock()
  mock_response.status_code = 200
  
  # Mocking an iterable response for stream=True
  chunks = [
   'data: {"choices": [{"delta": {"content": "Hello "}}]}\n',
   'data: {"choices": [{"delta": {"content": "World"}}]}\n',
   'data: [DONE]\n'
  ]
  mock_response.iter_lines.return_value = [c.encode('utf-8') for c in chunks]
  mock_post.return_value = mock_response
  
  result = ai_client.send(md_content="Context", user_message="Stream test", base_dir=".", stream=True)
  assert result == "Hello World"