"""
UI Components - Reusable Gradio handlers and helper functions

Provides synchronous handlers for Gradio that wrap async MCP client calls.
Handles async/sync boundary management and error formatting for the web UI.
"""

import asyncio
import threading
from typing import Dict, Optional, Awaitable, Coroutine, Any
from src.clients.mcp_client import MCPClient
from src.ui.formatters import create_sentiment_chart_html, create_pricing_tiers_html


class ToolCallHandler:
    """Handler for MCP tool calls with sync/async compatibility for Gradio"""
    
    def __init__(self, client: MCPClient):
        self.client = client
    
    async def call_tool(self, tool_name: str, arguments: Dict) -> Dict:
        """Call MCP tool asynchronously"""
        return await self.client.send_request(
            "tools/call",
            {
                "name": tool_name,
                "arguments": arguments
            }
        )
    
    def _run_async(self, coro):
        """Helper to run async code in sync context
        
        Handles three cases:
        1. No event loop exists: create new one with asyncio.run()
        2. Event loop exists but not running: use run_until_complete()
        3. Event loop is running (Gradio): use thread executor to avoid blocking
        """
        try:
            loop = asyncio.get_event_loop()
            if loop.is_running():
                # If loop is already running, we can't use run_until_complete
                # Instead, run in a separate thread with its own event loop
                import concurrent.futures
                import threading
                
                # Create and run in a thread
                result = None
                exception = None
                
                def run_in_thread():
                    nonlocal result, exception
                    try:
                        # Create new event loop for this thread
                        new_loop = asyncio.new_event_loop()
                        asyncio.set_event_loop(new_loop)
                        try:
                            result = new_loop.run_until_complete(coro)
                        finally:
                            new_loop.close()
                    except Exception as e:
                        exception = e
                
                thread = threading.Thread(target=run_in_thread)
                thread.start()
                thread.join()
                
                if exception:
                    raise exception
                return result
            else:
                # Loop exists but not running, safe to use
                return loop.run_until_complete(coro)
        except RuntimeError:
            # No event loop at all, create one
            return asyncio.run(coro)
    
    def analyze_product(self, product_name: str, category: str) -> str:
        """Analyze product - synchronous wrapper for Gradio

        Expected Response Schema:
            {
                "result": {
                    "status": "success" | "error",
                    "product": str,
                    "analysis": str,
                    "timestamp": str,
                    "error": str (optional)
                }
            }

        Args:
            product_name: Name of product to analyze (1-200 chars)
            category: Product category from dropdown

        Returns:
            Formatted markdown string for UI display
        """
        # Ensure category has a value to avoid "referenced before assignment" errors
        category = category or "general"
        
        # Validate input
        if not product_name or not isinstance(product_name, str):
            return "**Error: Product name is required and must be text**"

        product_name = product_name.strip()
        if not product_name:
            return "**Error: Product name cannot be empty**"

        if len(product_name) > 200:
            return "**Error: Product name is too long (max 200 characters)**"

        async def _analyze():
            try:
                import time
                start_time = time.time()

                # Show loading indicator
                loading_output = "**Processing: Analyzing product... Please wait**\n\n"

                response = await self.call_tool(
                    "analyze_product",
                    {
                        "product_name": product_name,
                        "category": category or "general"
                    }
                )

                elapsed_time = time.time() - start_time
                if response.get("result", {}).get("status") == "success":
                    result = response["result"]

                    output = f"# {result.get('product', product_name)}\n\n"
                    result_category = result.get('category')
                    if result_category:
                        output += f"**Category:** {result_category.title() if isinstance(result_category, str) else result_category} | "
                    output += f"**Analyzed at:** {result.get('timestamp', 'N/A')}\n\n"
                    output += f"**Processing time:** {elapsed_time:.2f}s\n\n"
                    output += "---\n\n"

                    analysis = result.get('analysis')
                    if analysis:
                        output += analysis

                    output += "\n\n**Success: Analysis Complete** - Review the insights above to refine your strategy."
                    return output
                else:
                    return "**Error: Analysis failed** - Please try again with a different product or check your input."
            except Exception as e:
                error_str = str(e)
                # Check for OpenAI API key error specifically
                if "OPENAI_API_KEY" in error_str.upper() or "openai" in error_str.lower() or "api key" in error_str.lower():
                    fallback_output = f"**Warning: OpenAI API key not configured.**\n\n"
                    fallback_output += f"**Set OPENAI_API_KEY environment variable to enable full functionality.**\n\n"
                    fallback_output += f"**Fallback Analysis:**\n\n"
                    fallback_output += f"- Product: {product_name}\n"
                    fallback_output += f"- Category: {category}\n"
                    fallback_output += f"- Estimated market potential: Standard\n"
                    fallback_output += f"- Suggested improvements: Optimize listing, consider pricing strategy\n\n"
                    fallback_output += f"**Success: Analysis Complete** - Basic information provided without AI enhancement."
                    return fallback_output
                elif "timeout" in error_str.lower() or "connection" in error_str.lower():
                    return f"**Error: Connection error:** {str(e)}\n\nPlease check your internet connection and try again shortly."
                elif "rate limit" in error_str.lower() or "quota" in error_str.lower():
                    return f"**Error: Rate limit exceeded:** {str(e)}\n\nPlease try again in a moment or check your API quota."
                else:
                    return f"**Error:** {str(e)}\n\nPlease ensure you're connected and try again. If the problem persists, contact support."

        return self._run_async(_analyze())
    
    def analyze_reviews(self, reviews_text: str, product_name: str = "") -> str:
        """Analyze reviews - synchronous wrapper for Gradio"""
        if not reviews_text.strip():
            return "**Error: Please paste at least one customer review to analyze**"

        reviews = [r.strip() for r in reviews_text.split("\n") if r.strip()]

        if not reviews:
            return "**Error: No reviews found** - Please paste reviews separated by line breaks."

        if len(reviews) > 50:  # Limit number of reviews
            return f"**Error: Too many reviews** - Maximum 50 reviews allowed, you provided {len(reviews)}"

        async def _analyze():
            try:
                import time
                start_time = time.time()

                response = await self.call_tool(
                    "analyze_reviews",
                    {
                        "reviews": reviews,
                        "product_name": product_name or "Product"
                    }
                )

                elapsed_time = time.time() - start_time
                if response.get("result", {}).get("status") == "success":
                    result = response["result"]

                    output = f"# Review Analysis: {result.get('product', 'Product')}\n\n"
                    output += f"**Reviews Analyzed:** {result.get('review_count', len(reviews))}\n"
                    output += f"**Processing time:** {elapsed_time:.2f}s\n\n"
                    output += "---\n\n"

                    # Add sentiment visualization if available
                    if "sentiment_distribution" in result:
                        output += create_sentiment_chart_html(result["sentiment_distribution"])
                        output += "\n"

                    if "analysis" in result:
                        output += result['analysis']

                    output += "\n\n**Success: Analysis Complete** - Use these insights to improve your product."
                    return output
                else:
                    return "**Error: Analysis failed** - Try with more detailed reviews or check your input."
            except Exception as e:
                error_str = str(e)
                # Check for OpenAI API key error specifically
                if "OPENAI_API_KEY" in error_str.upper() or "openai" in error_str.lower() or "api key" in error_str.lower():
                    fallback_output = f"**Warning: OpenAI API key not configured.**\n\n"
                    fallback_output += f"**Set OPENAI_API_KEY environment variable to enable full functionality.**\n\n"
                    fallback_output += f"**Basic Review Summary:**\n\n"
                    fallback_output += f"- Total Reviews: {len(reviews)}\n"
                    fallback_output += f"- Product: {product_name or 'Not specified'}\n"
                    fallback_output += f"- Analysis: Basic sentiment analysis not available without API key\n\n"
                    fallback_output += f"**Success: Summary Complete** - Basic information provided without AI enhancement."
                    return fallback_output
                elif "timeout" in error_str.lower() or "connection" in error_str.lower():
                    return f"**Error: Connection error:** {str(e)}\n\nPlease check your internet connection and try again shortly."
                elif "rate limit" in error_str.lower() or "quota" in error_str.lower():
                    return f"**Error: Rate limit exceeded:** {str(e)}\n\nPlease try again in a moment or check your API quota."
                else:
                    return f"**Error:** {str(e)}\n\nPlease check your reviews and try again. If the problem persists, contact support."

        return self._run_async(_analyze())
    
    def generate_listing(self, product_name: str, features_text: str, audience: str = "") -> str:
        """Generate product listing - synchronous wrapper for Gradio"""
        if not product_name.strip() or not features_text.strip():
            return "**Error: Please enter both product name and features**"

        features = [f.strip() for f in features_text.split(",") if f.strip()]

        if len(features) > 20:
            return f"**Error: Too many features** - Maximum 20 features allowed, you provided {len(features)}"

        async def _generate():
            try:
                import time
                start_time = time.time()

                response = await self.call_tool(
                    "generate_listing",
                    {
                        "product_name": product_name,
                        "features": features,
                        "target_audience": audience or "general consumers"
                    }
                )

                elapsed_time = time.time() - start_time
                if response.get("result", {}).get("status") == "success":
                    result = response["result"]

                    output = f"# Product Listing: {product_name}\n\n"
                    output += f"**Target Audience:** {audience or 'General'} | "
                    output += f"**Key Features:** {len(features)} | "
                    output += f"**Processing time:** {elapsed_time:.2f}s\n\n"
                    output += "---\n\n"

                    listing = result.get('listing')
                    if listing:
                        output += listing

                    output += f"\n\n**Success: Listing Generated** - Ready for publication."
                    return output
                else:
                    return "**Error: Generation failed** - Try with simpler features or check your input."
            except Exception as e:
                error_str = str(e)
                # Check for OpenAI API key error specifically
                if "OPENAI_API_KEY" in error_str.upper() or "openai" in error_str.lower() or "api key" in error_str.lower():
                    fallback_output = f"**Warning: OpenAI API key not configured.**\n\n"
                    fallback_output += f"**Set OPENAI_API_KEY environment variable to enable full functionality.**\n\n"
                    fallback_output += f"**Basic Listing Information:**\n\n"
                    fallback_output += f"- Product: {product_name}\n"
                    fallback_output += f"- Target Audience: {audience or 'General consumers'}\n"
                    fallback_output += f"- Features: {', '.join(features[:5])}...\n\n"
                    fallback_output += f"**Success: Information Provided** - Basic listing without AI enhancement."
                    return fallback_output
                elif "timeout" in error_str.lower() or "connection" in error_str.lower():
                    return f"**Error: Connection error:** {str(e)}\n\nPlease check your internet connection and try again shortly."
                elif "rate limit" in error_str.lower() or "quota" in error_str.lower():
                    return f"**Error: Rate limit exceeded:** {str(e)}\n\nPlease try again in a moment or check your API quota."
                else:
                    return f"**Error:** {str(e)}\n\nPlease check your input and try again. If the problem persists, contact support."

        return self._run_async(_generate())
    
    def price_recommendation(self, product_name: str, cost: float, category: str) -> str:
        """Get pricing recommendation - synchronous wrapper for Gradio

        Args:
            product_name: Product name (1-200 chars)
            cost: Product cost in dollars (>= $0.01)
            category: Product category from dropdown

        Returns:
            Formatted markdown string with pricing strategy
        """
        # Ensure category has a value to avoid "referenced before assignment" errors
        category = category or "general"
        
        # Validate inputs
        if not product_name or not isinstance(product_name, str):
            return "**Error: Product name is required and must be text**"

        product_name = product_name.strip()
        if not product_name:
            return "**Error: Product name cannot be empty**"

        if len(product_name) > 200:
            return "**Error: Product name is too long (max 200 characters)**"

        # Validate cost
        try:
            cost_float = float(cost)
        except (TypeError, ValueError):
            return "**Error: Cost must be a valid number**"

        if cost_float < 0.01:
            return "**Error: Cost must be at least $0.01**"

        if cost_float > 1000000:
            return "**Error: Cost seems unreasonably high (max $1,000,000)**"

        async def _recommend():
            try:
                import time
                start_time = time.time()

                response = await self.call_tool(
                    "price_recommendation",
                    {
                        "product_name": product_name,
                        "cost": float(cost),
                        "category": category or "general"
                    }
                )

                elapsed_time = time.time() - start_time
                if response.get("result", {}).get("status") == "success":
                    result = response["result"]

                    product_name_result = result.get('product', product_name)
                    output = f"# Pricing Strategy: {product_name_result}\n\n"
                    category_result = result.get('category', 'General')
                    output += f"**Category:** {category_result.title() if isinstance(category_result, str) else category_result} | "
                    cost_result = result.get('cost', 0)
                    if cost_result:
                        output += f"**Cost:** ${float(cost_result):.2f} | "
                    output += f"**Processing time:** {elapsed_time:.2f}s\n\n"
                    output += "---\n\n"

                    recommendation = result.get('recommendation')
                    if recommendation:
                        output += recommendation

                    output += "\n\n**Success: Strategy Optimized** - Balance profit and competitiveness."
                    return output
                else:
                    return "**Error: Calculation failed** - Try a different product or check your input."
            except Exception as e:
                error_str = str(e)
                # Check for OpenAI API key error specifically
                if "OPENAI_API_KEY" in error_str.upper() or "openai" in error_str.lower() or "api key" in error_str.lower():
                    fallback_output = f"**Warning: OpenAI API key not configured.**\n\n"
                    fallback_output += f"**Set OPENAI_API_KEY environment variable to enable full functionality.**\n\n"
                    fallback_output += f"**Basic Pricing Recommendation:**\n\n"
                    fallback_output += f"- Product: {product_name}\n"
                    fallback_output += f"- Cost: ${float(cost):.2f}\n"
                    fallback_output += f"- Category: {category}\n"
                    fallback_output += f"- Recommended Price: ${float(cost) * 1.3:.2f} (30% markup)\n"
                    fallback_output += f"- Strategy: Standard markup for profitability\n\n"
                    fallback_output += f"**Success: Recommendation Provided** - Basic pricing without AI enhancement."
                    return fallback_output
                elif "timeout" in error_str.lower() or "connection" in error_str.lower():
                    return f"**Error: Connection error:** {str(e)}\n\nPlease check your internet connection and try again shortly."
                elif "rate limit" in error_str.lower() or "quota" in error_str.lower():
                    return f"**Error: Rate limit exceeded:** {str(e)}\n\nPlease try again in a moment or check your API quota."
                else:
                    return f"**Error:** {str(e)}\n\nPlease check your input and try again. If the problem persists, contact support."

        return self._run_async(_recommend())
    
    def competitor_analysis(self, product_name: str, category: str, competitors_text: str = "") -> str:
        """Analyze competitive landscape - synchronous wrapper for Gradio

        Args:
            product_name: Product name to analyze (1-200 chars)
            category: Product category from dropdown
            competitors_text: Comma-separated list of competitors (optional)

        Returns:
            Formatted markdown string with competitive analysis
        """
        # Ensure category has a value to avoid "referenced before assignment" errors
        category = category or "general"
        
        # Validate product name
        if not product_name or not isinstance(product_name, str):
            return "**Error: Product name is required and must be text**"

        product_name = product_name.strip()
        if not product_name:
            return "**Error: Product name cannot be empty**"

        if len(product_name) > 200:
            return "**Error: Product name is too long (max 200 characters)**"

        # Parse and validate competitors from comma-separated text
        competitors = []
        if competitors_text and isinstance(competitors_text, str):
            raw_competitors = [c.strip() for c in competitors_text.split(",") if c.strip()]

            # Validate each competitor
            for comp in raw_competitors[:10]:  # Limit to 10 competitors
                if len(comp) > 200:
                    return f"**Error: Competitor name '{comp}' is too long (max 200 characters)**"
                competitors.append(comp)

            if len(raw_competitors) > 10:
                return f"**Error: Too many competitors** - Maximum 10 competitors allowed, you provided {len(raw_competitors)}"
        else:
            # If no competitors provided, we'll do a general analysis
            pass

        async def _analyze():
            try:
                import time
                start_time = time.time()

                response = await self.call_tool(
                    "competitor_analysis",
                    {
                        "product_name": product_name,
                        "category": category or "general",
                        "key_competitors": competitors
                    }
                )

                elapsed_time = time.time() - start_time
                if response.get("result", {}).get("status") == "success":
                    result = response["result"]

                    output = f"# Competitive Analysis: {result.get('product', product_name)}\n\n"
                    if competitors:
                        output += f"**Competitors:** {', '.join(competitors)} | "
                    else:
                        output += f"**Competitors:** General market analysis | "
                    output += f"**Analyzed at:** {result.get('timestamp', 'N/A')} | "
                    output += f"**Processing time:** {elapsed_time:.2f}s\n\n"
                    output += "---\n\n"

                    analysis = result.get('analysis')
                    if analysis:
                        output += analysis

                    output += "\n\n**Success: Analysis Complete** - Use these insights to differentiate your product."
                    return output
                else:
                    return "**Error: Analysis failed** - Try again with different inputs or check your data."
            except Exception as e:
                error_str = str(e)
                # Check for OpenAI API key error specifically
                if "OPENAI_API_KEY" in error_str.upper() or "openai" in error_str.lower() or "api key" in error_str.lower():
                    fallback_output = f"**Warning: OpenAI API key not configured.**\n\n"
                    fallback_output += f"**Set OPENAI_API_KEY environment variable to enable full functionality.**\n\n"
                    fallback_output += f"**Basic Competitive Analysis:**\n\n"
                    fallback_output += f"- Product: {product_name}\n"
                    fallback_output += f"- Category: {category}\n"
                    fallback_output += f"- Competitors: {', '.join(competitors[:3]) if competitors else 'General market analysis'}\n"
                    fallback_output += f"- Analysis: Standard competitive positioning assessment\n\n"
                    fallback_output += f"**Success: Analysis Provided** - Basic information without AI enhancement."
                    return fallback_output
                elif "timeout" in error_str.lower() or "connection" in error_str.lower():
                    return f"**Error: Connection error:** {str(e)}\n\nPlease check your internet connection and try again shortly."
                elif "rate limit" in error_str.lower() or "quota" in error_str.lower():
                    return f"**Error: Rate limit exceeded:** {str(e)}\n\nPlease try again in a moment or check your API quota."
                else:
                    return f"**Error:** {str(e)}\n\nPlease check your input and try again. If the problem persists, contact support."

        return self._run_async(_analyze())