const fs = require('fs').promises;
const path = require('path');
const readline = require('readline');
const { exec } = require('child_process');

class LMStudioFileAgent {
    constructor(options = {}) {
        this.lmStudioUrl = options.lmStudioUrl || 'http://localhost:1234/v1';
        this.workspaceDir = path.resolve(options.workspaceDir || './workspace');
        this.modelName = options.modelName || 'local-model';
        this.conversationHistory = [];
        
        // Create workspace directory
        this._ensureDirectory(this.workspaceDir);
        
        // Test connection
        this._testConnection();
    }
    
    async _ensureDirectory(dir) {
        try {
            await fs.mkdir(dir, { recursive: true });
        } catch (error) {
            console.error(`Error creating directory ${dir}:`, error);
        }
    }
    
    async _testConnection() {
        try {
            const response = await fetch(`${this.lmStudioUrl}/models`);
            if (response.ok) {
                const models = await response.json();
                console.log(`✓ Connected to LM Studio at ${this.lmStudioUrl}`);
                console.log(`✓ Available models:`, models);
            } else {
                console.log(`⚠ Warning: Could not connect to LM Studio (Status: ${response.status})`);
            }
        } catch (error) {
            console.log(`⚠ Warning: LM Studio connection failed: ${error.message}`);
            console.log('  Make sure LM Studio is running with the local server enabled');
        }
    }
    
    async queryLLM(prompt, systemPrompt = null, maxTokens = 2000) {
        const messages = [];
        
        if (systemPrompt) {
            messages.push({ role: 'system', content: systemPrompt });
        }
        
        // Add recent conversation history (last 10 messages)
        messages.push(...this.conversationHistory.slice(-10));
        messages.push({ role: 'user', content: prompt });
        
        try {
            const response = await fetch(`${this.lmStudioUrl}/chat/completions`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    model: this.modelName,
                    messages: messages,
                    temperature: 0.7,
                    max_tokens: maxTokens,
                    stream: false
                })
            });
            
            if (!response.ok) {
                throw new Error(`HTTP ${response.status}: ${response.statusText}`);
            }
            
            const result = await response.json();
            const content = result.choices[0].message.content;
            
            // Update conversation history
            this.conversationHistory.push({ role: 'user', content: prompt });
            this.conversationHistory.push({ role: 'assistant', content: content });
            
            return content;
        } catch (error) {
            console.error('Error querying LLM:', error.message);
            return `Error: ${error.message}`;
        }
    }
    
    // ============ FILE OPERATIONS ============
    
    async readFile(filepath) {
        try {
            const fullPath = this._resolvePath(filepath);
            const content = await fs.readFile(fullPath, 'utf-8');
            return content;
        } catch (error) {
            if (error.code === 'ENOENT') {
                return `Error: File '${filepath}' not found`;
            }
            return `Error reading file: ${error.message}`;
        }
    }
    
    async writeFile(filepath, content, mode = 'w') {
        try {
            const fullPath = this._resolvePath(filepath);
            await this._ensureDirectory(path.dirname(fullPath));
            
            if (mode === 'a') {
                await fs.appendFile(fullPath, content, 'utf-8');
            } else {
                await fs.writeFile(fullPath, content, 'utf-8');
            }
            
            return `✓ Successfully wrote to '${filepath}'`;
        } catch (error) {
            return `Error writing file: ${error.message}`;
        }
    }
    
    async editFile(filepath, oldContent, newContent) {
        try {
            const fullPath = this._resolvePath(filepath);
            const content = await fs.readFile(fullPath, 'utf-8');
            
            if (!content.includes(oldContent)) {
                return `Error: Could not find the specified content in '${filepath}'`;
            }
            
            const updatedContent = content.replace(oldContent, newContent);
            
            await fs.writeFile(fullPath, updatedContent, 'utf-8');
            
            return `✓ Successfully edited '${filepath}'`;
        } catch (error) {
            return `Error editing file: ${error.message}`;
        }
    }
    
    async applyCodeChanges(filepath, changes) {
        try {
            const fullPath = this._resolvePath(filepath);
            let content = await fs.readFile(fullPath, 'utf-8');
            
            let applied = 0;
            for (const change of changes) {
                const oldContent = change.old || '';
                const newContent = change.new || '';
                
                if (content.includes(oldContent)) {
                    content = content.replace(oldContent, newContent);
                    applied++;
                }
            }
            
            await fs.writeFile(fullPath, content, 'utf-8');
            
            return `✓ Applied ${applied}/${changes.length} changes to '${filepath}'`;
        } catch (error) {
            return `Error applying changes: ${error.message}`;
        }
    }
    
    async createFile(filepath, content = '', fileType = null) {
        try {
            const fullPath = this._resolvePath(filepath);
            
            try {
                await fs.access(fullPath);
                return `Error: File '${filepath}' already exists`;
            } catch {
                // File doesn't exist, continue
            }
            
            await this._ensureDirectory(path.dirname(fullPath));
            
            let fileContent = content;
            if (fileType) {
                fileContent = this._getTemplate(fileType) + content;
            }
            
            await fs.writeFile(fullPath, fileContent, 'utf-8');
            
            return `✓ Created new file '${filepath}'`;
        } catch (error) {
            return `Error creating file: ${error.message}`;
        }
    }
    
    async deleteFile(filepath) {
        try {
            const fullPath = this._resolvePath(filepath);
            await fs.unlink(fullPath);
            return `✓ Deleted '${filepath}'`;
        } catch (error) {
            if (error.code === 'ENOENT') {
                return `Error: File '${filepath}' not found`;
            }
            return `Error deleting file: ${error.message}`;
        }
    }
    
    // ============ DIRECTORY OPERATIONS ============
    
    async listDirectory(directory = '.') {
        try {
            const fullPath = this._resolvePath(directory);
            const items = await fs.readdir(fullPath, { withFileTypes: true });
            
            const result = [];
            for (const item of items) {
                const itemPath = path.join(fullPath, item.name);
                const stats = await fs.stat(itemPath);
                
                if (item.isDirectory()) {
                    result.push(`📁 ${item.name}/`);
                } else {
                    result.push(`📄 ${item.name} (${this._formatSize(stats.size)})`);
                }
            }
            
            return result.sort();
        } catch (error) {
            return [`Error listing directory: ${error.message}`];
        }
    }
    
    async searchFiles(pattern, directory = '.', recursive = true) {
        try {
            const fullPath = this._resolvePath(directory);
            const results = [];
            
            const searchRecursive = async (dir) => {
                const items = await fs.readdir(dir, { withFileTypes: true });
                
                for (const item of items) {
                    const itemPath = path.join(dir, item.name);
                    
                    if (item.isDirectory() && recursive) {
                        await searchRecursive(itemPath);
                    } else if (item.isFile()) {
                        // Simple glob pattern matching
                        if (this._matchPattern(item.name, pattern)) {
                            results.push(path.relative(this.workspaceDir, itemPath));
                        }
                    }
                }
            };
            
            await searchRecursive(fullPath);
            
            return results.length > 0 ? results : ['No files found'];
        } catch (error) {
            return [`Error searching files: ${error.message}`];
        }
    }
    
    async searchContent(searchText, directory = '.', filePattern = '*') {
        try {
            const fullPath = this._resolvePath(directory);
            const matches = [];
            const textExtensions = ['.js', '.jsx', '.ts', '.tsx', '.py', '.txt', '.md', '.json', '.html', '.css', '.yaml', '.yml', '.xml', '.sql'];
            
            const searchRecursive = async (dir) => {
                const items = await fs.readdir(dir, { withFileTypes: true });
                
                for (const item of items) {
                    const itemPath = path.join(dir, item.name);
                    
                    if (item.isDirectory()) {
                        await searchRecursive(itemPath);
                    } else if (item.isFile() && textExtensions.includes(path.extname(item.name))) {
                        try {
                            const content = await fs.readFile(itemPath, 'utf-8');
                            const lines = content.split('\n');
                            
                            lines.forEach((line, index) => {
                                if (line.toLowerCase().includes(searchText.toLowerCase())) {
                                    matches.push({
                                        file: path.relative(this.workspaceDir, itemPath),
                                        line: index + 1,
                                        content: line.trim()
                                    });
                                }
                            });
                        } catch {
                            // Skip files that can't be read
                        }
                    }
                }
            };
            
            await searchRecursive(fullPath);
            
            return matches;
        } catch (error) {
            return [{ error: error.message }];
        }
    }
    
    // ============ AGENT INTELLIGENCE ============
    
    async processRequest(userRequest) {
        const systemPrompt = `You are a file management agent. You can help with:
        1. Reading files - Use read_file(filepath)
        2. Writing files - Use write_file(filepath, content)
        3. Editing files - Use edit_file(filepath, old_content, new_content)
        4. Creating files - Use create_file(filepath, content)
        5. Deleting files - Use delete_file(filepath)
        6. Listing directories - Use list_directory(directory)
        7. Searching files - Use search_files(pattern, directory)
        8. Searching content - Use search_content(text, directory)
        
        Parse user requests and identify which operations to perform.
        Return a JSON response with the operations to execute.`;
        
        const prompt = `User request: ${userRequest}
        
        Available operations:
        ${JSON.stringify({
            read_file: "Read file contents",
            write_file: "Write to file",
            edit_file: "Edit file content",
            create_file: "Create new file",
            delete_file: "Delete file",
            list_directory: "List directory contents",
            search_files: "Search for files",
            search_content: "Search within files"
        }, null, 2)}
        
        Respond with a JSON array of operations to perform:
        [{"operation": "read_file", "args": {"filepath": "example.txt"}}]`;
        
        try {
            const llmResponse = await this.queryLLM(prompt, systemPrompt);
            
            // Try to parse JSON from response
            const jsonMatch = llmResponse.match(/\[.*\]/s);
            if (jsonMatch) {
                const operations = JSON.parse(jsonMatch[0]);
                
                const results = [];
                for (const op of operations) {
                    const result = await this._executeOperation(op);
                    results.push(result);
                }
                
                return results.join('\n');
            }
        } catch (error) {
            // Fall back to manual parsing
        }
        
        // Manual operation parsing
        return this._manualOperation(userRequest);
    }
    
    async _executeOperation(operation) {
        const opType = operation.operation;
        const args = operation.args || {};
        
        const operationMap = {
            read_file: () => this.readFile(args.filepath),
            write_file: () => this.writeFile(args.filepath, args.content, args.mode),
            edit_file: () => this.editFile(args.filepath, args.old_content, args.new_content),
            create_file: () => this.createFile(args.filepath, args.content, args.file_type),
            delete_file: () => this.deleteFile(args.filepath),
            list_directory: () => this.listDirectory(args.directory),
            search_files: () => this.searchFiles(args.pattern, args.directory),
            search_content: () => this.searchContent(args.text, args.directory)
        };
        
        if (operationMap[opType]) {
            try {
                const result = await operationMap[opType]();
                if (Array.isArray(result)) {
                    return result.join('\n');
                }
                return String(result);
            } catch (error) {
                return `Error executing ${opType}: ${error.message}`;
            }
        }
        
        return `Unknown operation: ${opType}`;
    }
    
    async _manualOperation(request) {
        const requestLower = request.toLowerCase();
        const results = [];
        
        // Read file
        if (requestLower.includes('read') && requestLower.includes('file')) {
            const match = request.match(/["']([^"']+)["']/);
            if (match) {
                results.push(`Reading file: ${match[1]}`);
                results.push(await this.readFile(match[1]));
            }
        }
        
        // List directory
        if (requestLower.includes('list') || requestLower.includes('show')) {
            if (requestLower.includes('directory') || requestLower.includes('folder') || requestLower.includes('files')) {
                results.push('Directory contents:');
                const items = await this.listDirectory();
                results.push(...items);
            }
        }
        
        // Search files
        if (requestLower.includes('search') || requestLower.includes('find')) {
            if (requestLower.includes('file')) {
                const match = request.match(/["']([^"']+)["']/);
                if (match) {
                    results.push(`Search results for: ${match[1]}`);
                    const files = await this.searchFiles(match[1]);
                    results.push(...files);
                }
            }
        }
        
        // Create file
        if (requestLower.includes('create') || requestLower.includes('new file')) {
            const match = request.match(/(?:create|new file)\s+["']?([^"']+)["']?/);
            if (match) {
                const filename = match[1].trim();
                results.push(`Creating file: ${filename}`);
                results.push(await this.createFile(filename));
            }
        }
        
        // If no manual operations matched, use LLM
        if (results.length === 0) {
            results.push(await this.queryLLM(request));
        }
        
        return results.join('\n');
    }
    
    // ============ UTILITY FUNCTIONS ============
    
    _resolvePath(filepath) {
        return path.isAbsolute(filepath) ? filepath : path.join(this.workspaceDir, filepath);
    }
    
    _formatSize(bytes) {
        const units = ['B', 'KB', 'MB', 'GB', 'TB'];
        let size = bytes;
        let unitIndex = 0;
        
        while (size >= 1024 && unitIndex < units.length - 1) {
            size /= 1024;
            unitIndex++;
        }
        
        return `${size.toFixed(1)} ${units[unitIndex]}`;
    }
    
    _matchPattern(filename, pattern) {
        // Convert glob pattern to regex
        const regexPattern = pattern
            .replace(/\./g, '\\.')
            .replace(/\*/g, '.*')
            .replace(/\?/g, '.');
        
        const regex = new RegExp(`^${regexPattern}$`);
        return regex.test(filename);
    }
    
    _getTemplate(fileType) {
        const templates = {
            javascript: "// JavaScript file\n\n",
            python: "#!/usr/bin/env python3\n\n",
            html: "<!DOCTYPE html>\n<html>\n<head>\n    <title>Document</title>\n</head>\n<body>\n    \n</body>\n</html>",
            css: "/* CSS file */\n\n",
            json: "{\n    \n}",
            markdown: "# Title\n\n",
            text: ""
        };
        
        return templates[fileType.toLowerCase()] || '';
    }
}

// ============ CLI INTERFACE ============

async function main() {
    console.log('🤖 LM Studio File Agent (Node.js)');
    console.log('='.repeat(50));
    
    // Initialize agent
    const agent = new LMStudioFileAgent({
        workspaceDir: './workspace'
    });
    
    // Create readline interface
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout
    });
    
    console.log('\nCommands:');
    console.log('  read <file>        - Read a file');
    console.log('  list               - List directory contents');
    console.log('  create <file>      - Create a new file');
    console.log('  search <pattern>   - Search for files');
    console.log('  write <file>       - Write content to file');
    console.log('  edit <file>        - Edit a file');
    console.log('  help               - Show this help');
    console.log('  exit               - Quit the program\n');
    
    const promptUser = () => {
        rl.question('You: ', async (input) => {
            const trimmedInput = input.trim();
            
            if (['exit', 'quit', 'q'].includes(trimmedInput.toLowerCase())) {
                console.log('Goodbye!');
                rl.close();
                return;
            }
            
            if (trimmedInput.toLowerCase() === 'help') {
                console.log('\nAvailable commands:');
                console.log('  read <file>        - Read a file');
                console.log('  list               - List directory contents');
                console.log('  create <file>      - Create a new file');
                console.log('  search <pattern>   - Search for files');
                console.log('  write <file>       - Write content to file');
                console.log('  edit <file>        - Edit a file');
                console.log('  delete <file>      - Delete a file');
                console.log('  search content <text> - Search within files');
                console.log('  exit               - Quit the program\n');
                promptUser();
                return;
            }
            
            if (!trimmedInput) {
                promptUser();
                return;
            }
            
            try {
                // Parse command
                const [command, ...args] = trimmedInput.split(' ');
                const arg = args.join(' ');
                
                let result;
                switch (command.toLowerCase()) {
                    case 'read':
                        result = await agent.readFile(arg);
                        break;
                    case 'list':
                        const items = await agent.listDirectory();
                        result = items.join('\n');
                        break;
                    case 'create':
                        result = await agent.createFile(arg);
                        break;
                    case 'write':
                        const [filepath, ...contentParts] = args;
                        const content = contentParts.join(' ');
                        if (filepath && content) {
                            result = await agent.writeFile(filepath, content);
                        } else {
                            result = 'Usage: write <file> <content>';
                        }
                        break;
                    case 'edit':
                        const [editFile, oldContent, newContent] = arg.split('|').map(s => s.trim());
                        if (editFile && oldContent && newContent) {
                            result = await agent.editFile(editFile, oldContent, newContent);
                        } else {
                            result = 'Usage: edit <file> | <old content> | <new content>';
                        }
                        break;
                    case 'delete':
                        result = await agent.deleteFile(arg);
                        break;
                    case 'search':
                        if (args[0] === 'content') {
                            const searchResults = await agent.searchContent(args[1] || '');
                            result = searchResults.map(r => `${r.file}:${r.line} - ${r.content}`).join('\n');
                        } else {
                            const files = await agent.searchFiles(arg);
                            result = files.join('\n');
                        }
                        break;
                    default:
                        // Process as natural language request
                        result = await agent.processRequest(trimmedInput);
                }
                
                console.log(`\nAgent:\n${result}`);
            } catch (error) {
                console.error(`Error: ${error.message}`);
            }
            
            promptUser();
        });
    };
    
    promptUser();
}

// Run if this file is executed directly
if (require.main === module) {
    main().catch(console.error);
}

// Export for use as a module
module.exports = LMStudioFileAgent;