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

namespace MarketAlly.AIPlugin.Context
{
	/// <summary>
	/// Plugin for storing conversation context and important information for future retrieval.
	/// Allows Claude to persist key decisions, code changes, and discussion points across sessions.
	/// </summary>
	[AIPlugin("ContextStorage", "Stores conversation context, decisions, and important information for future retrieval across chat sessions")]
	public class ContextStoragePlugin : IAIPlugin
	{
		[AIParameter("Type of context to store: 'conversation', 'decision', 'codechange', 'insight', 'milestone', or 'documentation'", required: true)]
		public string ContextType { get; set; } = "conversation";

		[AIParameter("The content/information to store", required: true)]
		public string Content { get; set; } = "";

		[AIParameter("Brief summary or title for this context entry", required: true)]
		public string Summary { get; set; } = "";

		[AIParameter("Tags to categorize this context (comma-separated)", required: false)]
		public string? Tags { get; set; }

		[AIParameter("Project path to associate this context with", required: false)]
		public string? ProjectPath { get; set; }

		[AIParameter("Priority level: 'low', 'medium', 'high', 'critical'", required: false)]
		public string Priority { get; set; } = "medium";

		[AIParameter("Additional metadata as JSON string", required: false)]
		public string? Metadata { get; set; }

		public IReadOnlyDictionary<string, Type> SupportedParameters => new Dictionary<string, Type>
		{
			["contextType"] = typeof(string),
			["contexttype"] = typeof(string),
			["content"] = typeof(string),
			["summary"] = typeof(string),
			["tags"] = typeof(string),
			["projectPath"] = typeof(string),
			["projectpath"] = typeof(string),
			["priority"] = typeof(string),
			["metadata"] = typeof(string)
		};

		public async Task<AIPluginResult> ExecuteAsync(IReadOnlyDictionary<string, object> parameters)
		{
			try
			{
				// Validate required parameters
				if (!parameters.ContainsKey("content"))
				{
					return new AIPluginResult(new ArgumentException("Missing required parameter: content"), 
						"The 'content' parameter is required");
				}
				if (!parameters.ContainsKey("summary"))
				{
					return new AIPluginResult(new ArgumentException("Missing required parameter: summary"), 
						"The 'summary' parameter is required");
				}

				// Extract parameters
				var contextType = parameters.TryGetValue("contextType", out var ct) ? ct.ToString()!.ToLower() : "conversation";
				var content = parameters["content"].ToString()!;
				var summary = parameters["summary"].ToString()!;
				var tags = parameters.TryGetValue("tags", out var t) ? t?.ToString() : null;
				var projectPath = parameters.TryGetValue("projectPath", out var pp) ? pp?.ToString() : null;
				var priority = parameters.TryGetValue("priority", out var p) ? p.ToString()!.ToLower() : "medium";
				var metadata = parameters.TryGetValue("metadata", out var m) ? m?.ToString() : null;

				// Create context entry
				var contextEntry = new StoredContextEntry
				{
					Id = Guid.NewGuid().ToString(),
					Type = contextType,
					Content = content,
					Summary = summary,
					Tags = !string.IsNullOrWhiteSpace(tags) 
					? tags.Split(',').Select(tag => tag.Trim()).Where(tag => !string.IsNullOrWhiteSpace(tag)).ToList() 
					: new List<string>(),
					ProjectPath = projectPath ?? Directory.GetCurrentDirectory(),
					Priority = priority,
					Timestamp = DateTime.UtcNow,
					Metadata = metadata != null ? JsonSerializer.Deserialize<Dictionary<string, object>>(metadata) : new Dictionary<string, object>()
				};

				// Store the context
				var storagePath = await GetStoragePathAsync(projectPath);
				var success = await StoreContextEntryAsync(contextEntry, storagePath);

				if (success)
				{
					// Also update the quick access index
					await UpdateContextIndexAsync(contextEntry, storagePath);

					return new AIPluginResult(new
					{
						Success = true,
						EntryId = contextEntry.Id,
						StoredAt = storagePath,
						Type = contextType,
						Summary = summary,
						Timestamp = contextEntry.Timestamp,
						Message = "Context stored successfully"
					}, $"Successfully stored {contextType} context: {summary}");
				}
				else
				{
					return new AIPluginResult(new { Success = false }, "Failed to store context");
				}
			}
			catch (Exception ex)
			{
				return new AIPluginResult(ex, "Failed to store context");
			}
		}

		private async Task<string> GetStoragePathAsync(string? projectPath)
		{
			if (string.IsNullOrEmpty(projectPath))
			{
				projectPath = Directory.GetCurrentDirectory();
			}

			// Create .context directory in project root
			var contextDir = Path.Combine(projectPath, ".context");
			if (!Directory.Exists(contextDir))
			{
				Directory.CreateDirectory(contextDir);
			}

			return contextDir;
		}

		private async Task<bool> StoreContextEntryAsync(StoredContextEntry entry, string storagePath)
		{
			try
			{
				// Store in monthly files to keep manageable file sizes
				var fileName = $"context-{DateTime.UtcNow:yyyy-MM}.json";
				var filePath = Path.Combine(storagePath, fileName);

				List<StoredContextEntry> existingEntries = new();

				// Load existing entries if file exists
				if (File.Exists(filePath))
				{
					var existingJson = await File.ReadAllTextAsync(filePath);
					var existing = JsonSerializer.Deserialize<List<StoredContextEntry>>(existingJson);
					if (existing != null)
					{
						existingEntries = existing;
					}
				}

				// Add new entry
				existingEntries.Add(entry);

				// Sort by timestamp (newest first)
				existingEntries = existingEntries.OrderByDescending(e => e.Timestamp).ToList();

				// Save back to file
				var json = JsonSerializer.Serialize(existingEntries, new JsonSerializerOptions
				{
					WriteIndented = true,
					Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping
				});

				await File.WriteAllTextAsync(filePath, json);
				return true;
			}
			catch
			{
				return false;
			}
		}

		private async Task UpdateContextIndexAsync(StoredContextEntry entry, string storagePath)
		{
			try
			{
				var indexPath = Path.Combine(storagePath, "context-index.json");

				List<ContextIndexEntry> indexEntries = new();

				// Load existing index
				if (File.Exists(indexPath))
				{
					var indexJson = await File.ReadAllTextAsync(indexPath);
					var existing = JsonSerializer.Deserialize<List<ContextIndexEntry>>(indexJson);
					if (existing != null)
					{
						indexEntries = existing;
					}
				}

				// Add new index entry
				var indexEntry = new ContextIndexEntry
				{
					Id = entry.Id,
					Type = entry.Type,
					Summary = entry.Summary,
					Tags = entry.Tags,
					Priority = entry.Priority,
					Timestamp = entry.Timestamp,
					FileName = $"context-{entry.Timestamp:yyyy-MM}.json"
				};

				indexEntries.Add(indexEntry);

				// Keep only the most recent 1000 entries in the index
				indexEntries = indexEntries.OrderByDescending(e => e.Timestamp).Take(1000).ToList();

				// Save index
				var indexJsonString = JsonSerializer.Serialize(indexEntries, new JsonSerializerOptions
				{
					WriteIndented = true
				});

				await File.WriteAllTextAsync(indexPath, indexJsonString);
			}
			catch
			{
				// Index update failed, but main storage succeeded
			}
		}
	}

	/// <summary>
	/// Represents a stored context entry with full content and metadata
	/// </summary>
	public class StoredContextEntry
	{
		public string Id { get; set; } = "";
		public string Type { get; set; } = "";
		public string Content { get; set; } = "";
		public string Summary { get; set; } = "";
		public List<string> Tags { get; set; } = new();
		public string ProjectPath { get; set; } = "";
		public string Priority { get; set; } = "";
		public DateTime Timestamp { get; set; }
		public Dictionary<string, object> Metadata { get; set; } = new();
	}

	/// <summary>
	/// Represents an index entry for quick context lookup
	/// </summary>
	public class ContextIndexEntry
	{
		public string Id { get; set; } = "";
		public string Type { get; set; } = "";
		public string Summary { get; set; } = "";
		public List<string> Tags { get; set; } = new();
		public string Priority { get; set; } = "";
		public DateTime Timestamp { get; set; }
		public string FileName { get; set; } = "";
	}
}