using System.Text.Json;
using MarketAlly.AIPlugin;

namespace MarketAlly.AIPlugin.Context
{
	/// <summary>
	/// Plugin for retrieving and managing conversation and codebase context across long chat sessions.
	/// Allows Claude to access previous discussion history, code changes, and project context.
	/// </summary>
	[AIPlugin("ContextRetrieval", "Retrieves conversation context, code history, and project information to maintain continuity across long chat sessions")]
	public class ContextRetrievalPlugin : IAIPlugin
	{
		[AIParameter("Type of context to retrieve: 'conversation', 'codebase', 'changes', 'project', or 'all'", required: true)]
		public string ContextType { get; set; } = "all";

		[AIParameter("Project or directory path to analyze for context", required: false)]
		public string? ProjectPath { get; set; }

		[AIParameter("Number of recent conversation entries to retrieve (default: 10)", required: false)]
		public int ConversationLimit { get; set; } = 10;

		[AIParameter("Include file content summaries in context", required: false)]
		public bool IncludeFileSummaries { get; set; } = true;

		[AIParameter("Include recent git changes in context", required: false)]
		public bool IncludeGitHistory { get; set; } = true;

		[AIParameter("Maximum context size in characters (default: 50000)", required: false)]
		public int MaxContextSize { get; set; } = 50000;

		public IReadOnlyDictionary<string, Type> SupportedParameters => new Dictionary<string, Type>
		{
			["contextType"] = typeof(string),
			["contexttype"] = typeof(string), // Add this lowercase variant
			["projectPath"] = typeof(string),
			["projectpath"] = typeof(string), // Add this too
			["conversationLimit"] = typeof(int),
			["conversationlimit"] = typeof(int), // And this
			["includeFileSummaries"] = typeof(bool),
			["includefilesummaries"] = typeof(bool),
			["includeGitHistory"] = typeof(bool),
			["includegithistory"] = typeof(bool),
			["maxContextSize"] = typeof(int),
			["maxcontextsize"] = typeof(int)
		};

		public async Task<AIPluginResult> ExecuteAsync(IReadOnlyDictionary<string, object> parameters)
		{
			try
			{
				// Extract parameters
				var contextType = parameters.TryGetValue("contextType", out var ct) ? ct.ToString()!.ToLower() : "all";
				var projectPath = parameters.TryGetValue("projectPath", out var pp) ? pp?.ToString() : null;
				var conversationLimit = parameters.TryGetValue("conversationLimit", out var cl) ? Convert.ToInt32(cl) : 10;
				var includeFileSummaries = parameters.TryGetValue("includeFileSummaries", out var ifs) ? Convert.ToBoolean(ifs) : true;
				var includeGitHistory = parameters.TryGetValue("includeGitHistory", out var igh) ? Convert.ToBoolean(igh) : true;
				var maxContextSize = parameters.TryGetValue("maxContextSize", out var mcs) ? Convert.ToInt32(mcs) : 50000;

				var context = new ContextInfo();

				// Retrieve different types of context based on request
				switch (contextType)
				{
					case "conversation":
						context.ConversationHistory = await GetConversationHistoryAsync(conversationLimit);
						break;
					case "codebase":
						context.CodebaseInfo = await GetCodebaseContextAsync(projectPath, includeFileSummaries);
						break;
					case "changes":
						context.RecentChanges = await GetRecentChangesAsync(projectPath, includeGitHistory);
						break;
					case "project":
						context.ProjectInfo = await GetProjectInfoAsync(projectPath);
						break;
					case "all":
					default:
						context.ConversationHistory = await GetConversationHistoryAsync(conversationLimit);
						context.CodebaseInfo = await GetCodebaseContextAsync(projectPath, includeFileSummaries);
						context.RecentChanges = await GetRecentChangesAsync(projectPath, includeGitHistory);
						context.ProjectInfo = await GetProjectInfoAsync(projectPath);
						break;
				}

				// Trim context if it exceeds size limit
				var contextJson = JsonSerializer.Serialize(context, new JsonSerializerOptions { WriteIndented = true });
				if (contextJson.Length > maxContextSize)
				{
					context = await TrimContextToSizeAsync(context, maxContextSize);
					contextJson = JsonSerializer.Serialize(context, new JsonSerializerOptions { WriteIndented = true });
				}

				return new AIPluginResult(context, $"Retrieved {contextType} context successfully. Context size: {contextJson.Length} characters");
			}
			catch (Exception ex)
			{
				return new AIPluginResult(ex, "Failed to retrieve context");
			}
		}

		private async Task<ConversationHistory> GetConversationHistoryAsync(int limit)
		{
			var history = new ConversationHistory();

			// Look for conversation history in common locations
			var possiblePaths = new[]
			{
				".context/conversation.json",
				".ai/chat-history.json",
				"conversation-context.json",
				Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".claude", "conversations.json")
			};

			foreach (var path in possiblePaths)
			{
				if (File.Exists(path))
				{
					try
					{
						var content = await File.ReadAllTextAsync(path);
						var conversations = JsonSerializer.Deserialize<ConversationEntry[]>(content);
						if (conversations != null)
						{
							history.Entries = conversations.Take(limit).ToList();
							history.Source = path;
							break;
						}
					}
					catch
					{
						// Continue to next possible path
					}
				}
			}

			// If no history file found, create a placeholder structure
			if (history.Entries.Count == 0)
			{
				history.Entries = new List<ConversationEntry>
				{
					new ConversationEntry
					{
						Timestamp = DateTime.UtcNow,
						Type = "system",
						Content = "No previous conversation history found. This appears to be a new session.",
						Context = "Starting fresh conversation context"
					}
				};
				history.Source = "Generated - no history file found";
			}

			return history;
		}

		private async Task<CodebaseInfo> GetCodebaseContextAsync(string? projectPath, bool includeFileSummaries)
		{
			var codebaseInfo = new CodebaseInfo();

			if (string.IsNullOrEmpty(projectPath))
			{
				projectPath = Directory.GetCurrentDirectory();
			}

			if (!Directory.Exists(projectPath))
			{
				return codebaseInfo;
			}

			codebaseInfo.RootPath = projectPath;
			codebaseInfo.LastAnalyzed = DateTime.UtcNow;

			// Get project structure
			var projectFiles = Directory.GetFiles(projectPath, "*.csproj", SearchOption.AllDirectories)
									  .Union(Directory.GetFiles(projectPath, "*.sln", SearchOption.TopDirectoryOnly))
									  .ToList();

			codebaseInfo.ProjectFiles = projectFiles.Select(f => new FileInfo
			{
				Path = Path.GetRelativePath(projectPath, f),
				LastModified = File.GetLastWriteTime(f),
				Size = new System.IO.FileInfo(f).Length
			}).ToList();

			// Get source files with summaries if requested
			if (includeFileSummaries)
			{
				var sourceFiles = Directory.GetFiles(projectPath, "*.cs", SearchOption.AllDirectories)
										   .Where(f => !f.Contains("bin") && !f.Contains("obj"))
										   .Take(20) // Limit to prevent overwhelming context
										   .ToList();

				codebaseInfo.SourceFiles = new List<FileInfo>();
				foreach (var file in sourceFiles)
				{
					var fileInfo = new FileInfo
					{
						Path = Path.GetRelativePath(projectPath, file),
						LastModified = File.GetLastWriteTime(file),
						Size = new System.IO.FileInfo(file).Length
					};

					// Add summary for smaller files
					if (fileInfo.Size < 10000) // Only summarize files smaller than 10KB
					{
						try
						{
							var content = await File.ReadAllTextAsync(file);
							fileInfo.Summary = GenerateFileSummary(content, file);
						}
						catch
						{
							fileInfo.Summary = "Unable to read file content";
						}
					}

					codebaseInfo.SourceFiles.Add(fileInfo);
				}
			}

			return codebaseInfo;
		}

		private async Task<RecentChanges> GetRecentChangesAsync(string? projectPath, bool includeGitHistory)
		{
			var changes = new RecentChanges();

			if (string.IsNullOrEmpty(projectPath))
			{
				projectPath = Directory.GetCurrentDirectory();
			}

			// Look for recent file modifications
			if (Directory.Exists(projectPath))
			{
				var recentFiles = Directory.GetFiles(projectPath, "*.*", SearchOption.AllDirectories)
										   .Where(f => !f.Contains("bin") && !f.Contains("obj") && !f.Contains(".git"))
										   .Where(f => File.GetLastWriteTime(f) > DateTime.Now.AddDays(-7))
										   .OrderByDescending(f => File.GetLastWriteTime(f))
										   .Take(10)
										   .ToList();

				changes.ModifiedFiles = recentFiles.Select(f => new FileChange
				{
					Path = Path.GetRelativePath(projectPath, f),
					ModifiedDate = File.GetLastWriteTime(f),
					ChangeType = "Modified"
				}).ToList();
			}

			// Get git history if available and requested
			if (includeGitHistory && Directory.Exists(Path.Combine(projectPath!, ".git")))
			{
				try
				{
					changes.GitCommits = await GetRecentGitCommitsAsync(projectPath!);
				}
				catch
				{
					// Git history not available or accessible
				}
			}

			return changes;
		}

		private async Task<ProjectInfo> GetProjectInfoAsync(string? projectPath)
		{
			var projectInfo = new ProjectInfo();

			if (string.IsNullOrEmpty(projectPath))
			{
				projectPath = Directory.GetCurrentDirectory();
			}

			projectInfo.Path = projectPath;
			projectInfo.Name = Path.GetFileName(projectPath);

			// Look for configuration files
			var configFiles = new[]
			{
				"refactor-config.json",
				"appsettings.json",
				"package.json",
				"project.json"
			};

			foreach (var configFile in configFiles)
			{
				var fullPath = Path.Combine(projectPath, configFile);
				if (File.Exists(fullPath))
				{
					try
					{
						var content = await File.ReadAllTextAsync(fullPath);
						projectInfo.ConfigurationFiles[configFile] = content;
					}
					catch
					{
						projectInfo.ConfigurationFiles[configFile] = "Unable to read configuration file";
					}
				}
			}

			// Analyze project structure
			if (Directory.Exists(projectPath))
			{
				var directories = Directory.GetDirectories(projectPath, "*", SearchOption.TopDirectoryOnly)
										   .Where(d => !Path.GetFileName(d).StartsWith(".") &&
													  !Path.GetFileName(d).Equals("bin", StringComparison.OrdinalIgnoreCase) &&
													  !Path.GetFileName(d).Equals("obj", StringComparison.OrdinalIgnoreCase))
										   .Select(d => Path.GetFileName(d))
										   .ToList();

				projectInfo.DirectoryStructure = directories;
			}

			return projectInfo;
		}

		private async Task<List<GitCommit>> GetRecentGitCommitsAsync(string projectPath)
		{
			var commits = new List<GitCommit>();

			try
			{
				// Use git command line to get recent commits
				var processInfo = new System.Diagnostics.ProcessStartInfo
				{
					FileName = "git",
					Arguments = "log --oneline -10 --date=short --pretty=format:\"%h|%ad|%s|%an\"",
					WorkingDirectory = projectPath,
					RedirectStandardOutput = true,
					UseShellExecute = false,
					CreateNoWindow = true
				};

				using var process = System.Diagnostics.Process.Start(processInfo);
				if (process != null)
				{
					var output = await process.StandardOutput.ReadToEndAsync();
					await process.WaitForExitAsync();

					var lines = output.Split('\n', StringSplitOptions.RemoveEmptyEntries);
					foreach (var line in lines)
					{
						var parts = line.Split('|');
						if (parts.Length >= 4)
						{
							commits.Add(new GitCommit
							{
								Hash = parts[0].Trim('"'),
								Date = parts[1],
								Message = parts[2],
								Author = parts[3].Trim('"')
							});
						}
					}
				}
			}
			catch
			{
				// Git not available or accessible
			}

			return commits;
		}

		private string GenerateFileSummary(string content, string filePath)
		{
			var lines = content.Split('\n');
			var summary = new List<string>();

			// Extract key information
			summary.Add($"File: {Path.GetFileName(filePath)} ({lines.Length} lines)");

			// Look for class/interface definitions
			var typeDefinitions = lines.Where(l => l.Trim().StartsWith("public class") ||
												  l.Trim().StartsWith("public interface") ||
												  l.Trim().StartsWith("public enum"))
									   .Select(l => l.Trim())
									   .Take(3)
									   .ToList();

			if (typeDefinitions.Any())
			{
				summary.Add("Types: " + string.Join(", ", typeDefinitions));
			}

			// Look for public methods
			var methods = lines.Where(l => l.Trim().StartsWith("public") && l.Contains("("))
							 .Select(l => l.Trim())
							 .Take(5)
							 .ToList();

			if (methods.Any())
			{
				summary.Add("Key Methods: " + string.Join("; ", methods.Select(m => m.Length > 60 ? m.Substring(0, 60) + "..." : m)));
			}

			return string.Join(" | ", summary);
		}

		private async Task<ContextInfo> TrimContextToSizeAsync(ContextInfo context, int maxSize)
		{
			// Start by trimming the largest sections first
			var trimmedContext = new ContextInfo
			{
				ConversationHistory = context.ConversationHistory,
				ProjectInfo = context.ProjectInfo // Keep project info as it's usually small but important
			};

			var currentSize = JsonSerializer.Serialize(trimmedContext).Length;

			// Add codebase info if there's room
			if (currentSize < maxSize * 0.7) // Reserve 30% for other content
			{
				var trimmedCodebase = context.CodebaseInfo;
				if (trimmedCodebase?.SourceFiles?.Count > 10)
				{
					trimmedCodebase.SourceFiles = trimmedCodebase.SourceFiles.Take(10).ToList();
				}
				trimmedContext.CodebaseInfo = trimmedCodebase;
			}

			// Add recent changes if there's room
			currentSize = JsonSerializer.Serialize(trimmedContext).Length;
			if (currentSize < maxSize * 0.9) // Reserve 10% buffer
			{
				var trimmedChanges = context.RecentChanges;
				if (trimmedChanges?.ModifiedFiles?.Count > 5)
				{
					trimmedChanges.ModifiedFiles = trimmedChanges.ModifiedFiles.Take(5).ToList();
				}
				if (trimmedChanges?.GitCommits?.Count > 5)
				{
					trimmedChanges.GitCommits = trimmedChanges.GitCommits.Take(5).ToList();
				}
				trimmedContext.RecentChanges = trimmedChanges;
			}

			return trimmedContext;
		}
	}

	// Supporting data structures
	public class ContextInfo
	{
		public ConversationHistory? ConversationHistory { get; set; }
		public CodebaseInfo? CodebaseInfo { get; set; }
		public RecentChanges? RecentChanges { get; set; }
		public ProjectInfo? ProjectInfo { get; set; }
	}

	public class ConversationHistory
	{
		public List<ConversationEntry> Entries { get; set; } = new();
		public string Source { get; set; } = "";
	}

	public class ConversationEntry
	{
		public DateTime Timestamp { get; set; }
		public string Type { get; set; } = ""; // "user", "assistant", "system"
		public string Content { get; set; } = "";
		public string Context { get; set; } = "";
	}

	public class CodebaseInfo
	{
		public string RootPath { get; set; } = "";
		public DateTime LastAnalyzed { get; set; }
		public List<FileInfo> ProjectFiles { get; set; } = new();
		public List<FileInfo> SourceFiles { get; set; } = new();
	}

	public class FileInfo
	{
		public string Path { get; set; } = "";
		public DateTime LastModified { get; set; }
		public long Size { get; set; }
		public string? Summary { get; set; }
	}

	public class RecentChanges
	{
		public List<FileChange> ModifiedFiles { get; set; } = new();
		public List<GitCommit> GitCommits { get; set; } = new();
	}

	public class FileChange
	{
		public string Path { get; set; } = "";
		public DateTime ModifiedDate { get; set; }
		public string ChangeType { get; set; } = "";
	}

	public class GitCommit
	{
		public string Hash { get; set; } = "";
		public string Date { get; set; } = "";
		public string Message { get; set; } = "";
		public string Author { get; set; } = "";
	}

	public class ProjectInfo
	{
		public string Path { get; set; } = "";
		public string Name { get; set; } = "";
		public Dictionary<string, string> ConfigurationFiles { get; set; } = new();
		public List<string> DirectoryStructure { get; set; } = new();
	}
}