import os
import pytest
from unittest.mock import Mock, patch, MagicMock
from app import generate_prompt

TEST_SYSTEM_PROMPT = "PROMPT ROULETTE ..."
TEST_OPENAI_API_KEY = "sk-prompt-roulette-..."
TEST_OPENAI_CHAT_RESPONSE_CONTENT = "You are ..."
TEST_GRADIO_SESSION_HASH = "prompt-roulette-session-..."

class TestGeneratePrompt:
    def test_gradio_app_loads(self):
        from app import demo
        assert demo is not None

    @patch("app.OpenAI")
    @patch.dict(os.environ, {
        "SYSTEM_PROMPT": TEST_SYSTEM_PROMPT,
        "OPENAI_API_KEY": TEST_OPENAI_API_KEY
    })
    def test_generate_prompt_success(self, mock_openai_class):
        """Test a successful OpenAI API call."""
        # Mock the OpenAI client and response
        mock_client = Mock()
        mock_openai_class.return_value = mock_client

        mock_response = Mock()
        mock_response.choices = [Mock()]
        mock_response.choices[0].message = Mock()
        mock_response.choices[0].message.content = TEST_OPENAI_CHAT_RESPONSE_CONTENT

        mock_client.chat.completions.create.return_value = mock_response

        # Mock the gradio request
        mock_gradio_request = Mock()
        mock_gradio_request.session_hash = TEST_GRADIO_SESSION_HASH

        # Call the function
        result = generate_prompt(mock_gradio_request)

        assert result == TEST_OPENAI_CHAT_RESPONSE_CONTENT

    @patch("app.OpenAI")
    @patch.dict(os.environ, {
        "SYSTEM_PROMPT": TEST_SYSTEM_PROMPT,
        "OPENAI_API_KEY": TEST_OPENAI_API_KEY
    })
    def test_generate_prompt_api_failure(self, mock_openai_class):
        """Test API failure handling."""
        # Mock the OpenAI client and response
        mock_client = Mock()
        mock_openai_class.return_value = mock_client
        mock_client.chat.completions.create.side_effect = Exception("OpenAI is down.")

        # Mock the gradio request
        mock_gradio_request = Mock()
        mock_gradio_request.session_hash = TEST_GRADIO_SESSION_HASH

        # Call the function
        result = generate_prompt(mock_gradio_request)

        assert result == "⚠️  Could not generate a prompt. No fish today."

    @patch("app.logger")
    @patch("app.OpenAI")
    @patch.dict(os.environ, {
        "SYSTEM_PROMPT": TEST_SYSTEM_PROMPT,
        "OPENAI_API_KEY": TEST_OPENAI_API_KEY
    })
    def test_logging_on_success(self, mock_openai_class, mock_logger):
        """Test that logging works correctly on successful API call."""
        api_total_token_count = 500

        # Mock the OpenAI client and response
        mock_client = Mock()
        mock_openai_class.return_value = mock_client

        mock_response = Mock()
        mock_response.choices = [Mock()]
        mock_response.choices[0].message = Mock()
        mock_response.choices[0].message.content = TEST_OPENAI_CHAT_RESPONSE_CONTENT
        mock_response.usage.total_tokens = api_total_token_count

        mock_client.chat.completions.create.return_value = mock_response

        # Mock the gradio request
        mock_gradio_request = Mock()
        mock_gradio_request.session_hash = TEST_GRADIO_SESSION_HASH

        # Call the function
        generate_prompt(mock_gradio_request)

        mock_logger.info.assert_any_call(
            f"Making OpenAI API request - Session: {TEST_GRADIO_SESSION_HASH}"
        )
        mock_logger.info.assert_any_call(
            f"API request successful - Session: {TEST_GRADIO_SESSION_HASH}"
            f" - tokens used: {api_total_token_count}"
        )

    @patch("app.logger")
    @patch("app.OpenAI")
    @patch.dict(os.environ, {
        "SYSTEM_PROMPT": TEST_SYSTEM_PROMPT,
        "OPENAI_API_KEY": TEST_OPENAI_API_KEY
    })
    def test_logging_on_failure(self, mock_openai_class, mock_logger):
        """Test that logging works correctly on failed API call."""
        api_error_message = "OpenAI is down."

        # Mock the OpenAI client and response
        mock_client = Mock()
        mock_openai_class.return_value = mock_client
        mock_client.chat.completions.create.side_effect = Exception(api_error_message)

        # Mock the gradio request
        mock_gradio_request = Mock()
        mock_gradio_request.session_hash = TEST_GRADIO_SESSION_HASH

        # Call the function
        generate_prompt(mock_gradio_request)

        mock_logger.error.assert_any_call(
            f"API request failed - Session: {TEST_GRADIO_SESSION_HASH} - Error: {api_error_message}"
        )

    @patch.dict(os.environ, {}, clear=True)
    def test_missing_env_vars(self):
        """Test what happens when SYSTEM_PROMPT and/or OPENAI_API_KEY are missing."""
        # Mock the gradio request
        mock_gradio_request = Mock()
        mock_gradio_request.session_hash = TEST_GRADIO_SESSION_HASH

        # Call the function
        result = generate_prompt(mock_gradio_request)

        assert result ==  "⚠️  Service temporarily unavailable. Please try again later."