using MarketAlly.AIPlugin;
using MarketAlly.AIPlugin.Models;
using MarketAlly.AIPlugin.Refactoring.Plugins;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;

namespace MarketAlly.AIPlugin.Refactoring.Services;

/// <summary>
/// AI-powered service for enhancing README generation with intelligent content
/// Integrates with the AIPlugin framework to leverage Claude for content improvement
/// </summary>
public class AIReadmeEnhancementService
{
	private readonly AIPluginRegistry _pluginRegistry;
	private readonly ILogger<AIReadmeEnhancementService> _logger;

	public AIReadmeEnhancementService(AIPluginRegistry pluginRegistry, ILogger<AIReadmeEnhancementService> logger = null)
	{
		_pluginRegistry = pluginRegistry;
		_logger = logger;
	}

	/// <summary>
	/// Enhances a basic README analysis with AI-powered content generation
	/// </summary>
	public async Task<EnhancedReadmeResult> EnhanceReadmeWithAIAsync(
		ProjectAnalysisResult analysis,
		List<ChatMessage> conversationHistory = null)
	{
		try
		{
			var result = new EnhancedReadmeResult
			{
				OriginalAnalysis = analysis,
				EnhancedSections = new Dictionary<string, string>()
			};

			// Prepare structured project data for AI analysis
			var projectSummary = PrepareProjectSummaryForAI(analysis);

			// Create AI conversation for README enhancement
			var messages = conversationHistory ?? new List<ChatMessage>();

			if (!messages.Any())
			{
				messages.Add(ChatMessage.System(@"You are a senior technical writer and software architect. Your job is to analyze project structures and generate outstanding README documentation.

You have access to tools that can:
- Read project files to understand code structure
- Analyze code quality and architecture
- Generate comprehensive documentation

Focus on creating README content that is:
- Clear and professional
- Technically accurate
- Includes practical examples
- Explains the value proposition
- Provides excellent setup instructions

Always structure your analysis before writing content."));
			}

			// Phase 1: Analyze project architecture and purpose
			messages.Add(ChatMessage.User($@"I need you to analyze this project and create an outstanding README.md file.

Project Summary:
{projectSummary}

Please start by using the ReadFile tool to examine the key files, then provide a comprehensive README that includes:

1. Project overview with clear value proposition
2. Professional installation/setup instructions
3. Practical usage examples with real code
4. API documentation for public interfaces
5. Architecture overview if applicable
6. Contributing guidelines

Key files to analyze: {string.Join(", ", analysis.KeyFiles.Take(5).Select(f => f.FilePath))}

Start by reading and analyzing the most important files to understand the project's purpose and architecture."));

			// Use existing plugin system to call AI
			var enhancedContent = await CallAIForReadmeEnhancement(messages);

			result.EnhancedContent = enhancedContent;
			result.Success = true;
			result.EnhancementApplied = true;

			return result;
		}
		catch (Exception ex)
		{
			_logger.LogError(ex, "Failed to enhance README with AI");
			return new EnhancedReadmeResult
			{
				Success = false,
				Error = ex.Message,
				OriginalAnalysis = analysis
			};
		}
	}

	/// <summary>
	/// Generates intelligent project descriptions using AI analysis
	/// </summary>
	public async Task<string> GenerateIntelligentDescriptionAsync(ProjectAnalysisResult analysis)
	{
		try
		{
			var projectData = PrepareProjectSummaryForAI(analysis);

			var messages = new List<ChatMessage>
			{
				ChatMessage.System("You are a technical writer specializing in project descriptions. Create compelling, accurate descriptions based on code analysis."),
				ChatMessage.User($@"Based on this project analysis, write a clear, professional description that explains what this project does and its key benefits:

{projectData}

Keep the description:
- 2-3 sentences maximum
- Focused on value and purpose
- Professional but accessible
- Technically accurate")
			};

			var description = await CallAIForReadmeEnhancement(messages);
			return description ?? GenerateFallbackDescription(analysis);
		}
		catch (Exception ex)
		{
			_logger.LogError(ex, "Failed to generate AI description, using fallback");
			return GenerateFallbackDescription(analysis);
		}
	}

	/// <summary>
	/// Generates intelligent usage examples based on API analysis
	/// </summary>
	public async Task<string> GenerateIntelligentExamplesAsync(ProjectAnalysisResult analysis)
	{
		if (!analysis.PublicApis.Any())
			return GenerateFallbackExamples(analysis);

		try
		{
			var apiSummary = PrepareApiSummaryForAI(analysis);

			var messages = new List<ChatMessage>
			{
				ChatMessage.System("You are a technical writer creating code examples. Generate practical, working examples that developers can actually use."),
				ChatMessage.User($@"Create practical usage examples for this project based on its public API:

{apiSummary}

Generate examples that:
- Show real-world usage scenarios
- Are copy-pasteable and working
- Progress from basic to advanced usage
- Include error handling where appropriate
- Use meaningful variable names

Format as markdown code blocks with explanatory text.")
			};

			var examples = await CallAIForReadmeEnhancement(messages);
			return examples ?? GenerateFallbackExamples(analysis);
		}
		catch (Exception ex)
		{
			_logger.LogError(ex, "Failed to generate AI examples, using fallback");
			return GenerateFallbackExamples(analysis);
		}
	}

	/// <summary>
	/// Enhances API documentation with intelligent descriptions
	/// </summary>
	public async Task<string> EnhanceApiDocumentationAsync(ProjectAnalysisResult analysis)
	{
		if (!analysis.PublicApis.Any())
			return "";

		try
		{
			var apiDetails = PrepareDetailedApiSummaryForAI(analysis);

			var messages = new List<ChatMessage>
			{
				ChatMessage.System("You are a technical writer specializing in API documentation. Create clear, comprehensive API docs that developers love to use."),
				ChatMessage.User($@"Create professional API documentation for these public methods:

{apiDetails}

For each method, provide:
- Clear description of purpose
- Parameter explanations
- Return value details
- Usage examples
- Any important notes or warnings

Format as clean markdown with proper code formatting.")
			};

			var apiDocs = await CallAIForReadmeEnhancement(messages);
			return apiDocs ?? GenerateFallbackApiDocs(analysis);
		}
		catch (Exception ex)
		{
			_logger.LogError(ex, "Failed to enhance API docs with AI, using fallback");
			return GenerateFallbackApiDocs(analysis);
		}
	}

	private string PrepareProjectSummaryForAI(ProjectAnalysisResult analysis)
	{
		var summary = $@"Project Name: {analysis.ProjectName}
Project Type: {analysis.DetectedProjectType}
Target Framework: {analysis.TargetFramework}
Files Analyzed: {analysis.FilesAnalyzed}

Key Components:
{string.Join("\n", analysis.KeyFiles.Take(10).Select(f => $"- {f.FileName}: {f.Classes.Count} classes, {f.Interfaces.Count} interfaces, {f.LineCount} lines"))}

Public APIs: {analysis.PublicApis.Count} methods
Dependencies: {string.Join(", ", analysis.Dependencies.Take(10))}

Project Features:
- Has Tests: {analysis.HasTests}
- Has Documentation: {analysis.HasDocumentation}
- Is Solution: {analysis.IsSolution}";

		if (analysis.IsSolution)
		{
			summary += $"\n\nSub-Projects:\n{string.Join("\n", analysis.SubProjects.Select(p => $"- {p.ProjectName} ({p.DetectedProjectType})"))}";
		}

		return summary;
	}

	private string PrepareApiSummaryForAI(ProjectAnalysisResult analysis)
	{
		var apiSummary = "Public API Methods:\n";

		foreach (var api in analysis.PublicApis.Take(15)) // Limit for token management
		{
			apiSummary += $"\n{api.ReturnType} {api.Name}(";
			if (api.Parameters.Any())
			{
				apiSummary += string.Join(", ", api.Parameters);
			}
			apiSummary += ")";

			if (!string.IsNullOrEmpty(api.Summary))
			{
				apiSummary += $" // {api.Summary}";
			}

			if (api.IsAsync)
			{
				apiSummary += " [Async]";
			}
		}

		return apiSummary;
	}

	private string PrepareDetailedApiSummaryForAI(ProjectAnalysisResult analysis)
	{
		var detailed = "Detailed API Analysis:\n";

		var groupedApis = analysis.PublicApis
			.GroupBy(api => ExtractClassName(api.Name))
			.Take(5); // Limit classes for token management

		foreach (var group in groupedApis)
		{
			detailed += $"\n## {group.Key} Class\n";

			foreach (var api in group.Take(8)) // Limit methods per class
			{
				detailed += $"\n### {api.Name}\n";
				detailed += $"Return Type: {api.ReturnType}\n";
				detailed += $"Parameters: {(api.Parameters.Any() ? string.Join(", ", api.Parameters) : "None")}\n";
				detailed += $"Async: {api.IsAsync}\n";

				if (!string.IsNullOrEmpty(api.Summary))
				{
					detailed += $"Description: {api.Summary}\n";
				}
			}
		}

		return detailed;
	}

	private string ExtractClassName(string methodName)
	{
		// Simple heuristic - in a real implementation, you'd track the actual containing class
		return "Service"; // Default fallback
	}

	private async Task<string> CallAIForReadmeEnhancement(List<ChatMessage> messages)
	{
		try
		{
			// This would integrate with your existing Claude service
			// For now, return a placeholder that indicates AI processing

			// In a real implementation, you would:
			// 1. Use your existing Claude4ExampleService pattern
			// 2. Call the AI API with the prepared messages
			// 3. Process tool calls if the AI wants to read files
			// 4. Return the enhanced content

			_logger.LogInformation("AI enhancement requested with {MessageCount} messages", messages.Count);

			// Placeholder for AI integration
			return await Task.FromResult("AI enhancement placeholder - integrate with Claude service");
		}
		catch (Exception ex)
		{
			_logger.LogError(ex, "AI enhancement call failed");
			return null;
		}
	}

	private string GenerateFallbackDescription(ProjectAnalysisResult analysis)
	{
		var features = new List<string>();

		if (analysis.PublicApis.Any())
			features.Add($"provides {analysis.PublicApis.Count} public API methods");

		if (analysis.Dependencies.Any())
			features.Add($"integrates with {analysis.Dependencies.Count} external packages");

		if (analysis.HasTests)
			features.Add("includes comprehensive test coverage");

		var description = $"A {analysis.DetectedProjectType} built with .NET {analysis.TargetFramework}";

		if (features.Any())
		{
			description += " that " + string.Join(", ", features);
		}

		return description + ".";
	}

	private string GenerateFallbackExamples(ProjectAnalysisResult analysis)
	{
		if (analysis.DetectedProjectType == "library" && analysis.PublicApis.Any())
		{
			var firstApi = analysis.PublicApis.First();
			return $@"### Basic Usage

```csharp
using {analysis.KeyFiles.FirstOrDefault()?.Namespace ?? analysis.ProjectName};

// Example usage
var service = new ServiceClass();
{(firstApi.IsAsync ? "var result = await " : "var result = ")}service.{firstApi.Name}({GenerateExampleParams(firstApi.Parameters)});
```";
		}

		return $@"### Getting Started

```csharp
// TODO: Add specific usage examples for {analysis.ProjectName}
// This section will be enhanced with actual usage patterns
```";
	}

	private string GenerateFallbackApiDocs(ProjectAnalysisResult analysis)
	{
		if (!analysis.PublicApis.Any()) return "";

		var docs = "## API Reference\n\n";

		foreach (var api in analysis.PublicApis.Take(10))
		{
			docs += $"### {api.Name}\n\n";
			docs += $"```csharp\n{api.ReturnType} {api.Name}({string.Join(", ", api.Parameters)})\n```\n\n";

			if (!string.IsNullOrEmpty(api.Summary))
			{
				docs += $"{api.Summary}\n\n";
			}
		}

		return docs;
	}

	private string GenerateExampleParams(List<string> parameters)
	{
		if (!parameters.Any()) return "";

		return string.Join(", ", parameters.Select(p =>
		{
			var type = p.Split(' ')[0].ToLower();
			return type switch
			{
				"string" => "\"example\"",
				"int" => "42",
				"bool" => "true",
				"double" or "decimal" => "3.14",
				_ => "null"
			};
		}));
	}
}

/// <summary>
/// Result of AI-enhanced README generation
/// </summary>
public class EnhancedReadmeResult
{
	public bool Success { get; set; }
	public string Error { get; set; }
	public ProjectAnalysisResult OriginalAnalysis { get; set; }
	public string EnhancedContent { get; set; }
	public Dictionary<string, string> EnhancedSections { get; set; } = new();
	public bool EnhancementApplied { get; set; }
	public List<string> AIInsights { get; set; } = new();
	public DateTime GeneratedAt { get; set; } = DateTime.UtcNow;
}