const fs = require('fs').promises;
const path = require('path');

class ConfigParser {
  static async parseConfig(filePath) {
    try {
      const content = await fs.readFile(filePath, 'utf8');
      const config = {};
      
      const lines = content.split('\n');
      for (const line of lines) {
        const trimmed = line.trim();
        
        if (!trimmed || trimmed.startsWith('#')) continue;
        
        const equalIndex = trimmed.indexOf('=');
        if (equalIndex === -1) continue;
        
        const key = trimmed.substring(0, equalIndex).trim();
        const value = trimmed.substring(equalIndex + 1).trim();
        
        config[key] = value;
      }
      
      return config;
    } catch (error) {
      if (error.code === 'ENOENT') {
        return {};
      }
      throw error;
    }
  }

  static async writeConfig(filePath, config) {
    const lines = [];
    
    for (const [key, value] of Object.entries(config)) {
      if (value !== undefined && value !== null) {
        lines.push(`${key} = ${value}`);
      }
    }
    
    await fs.writeFile(filePath, lines.join('\n') + '\n', 'utf8');
  }

  static async parseModConfig(filePath) {
    const config = await this.parseConfig(filePath);
    
    if (config.depends) {
      config.depends = config.depends.split(',').map(dep => dep.trim()).filter(Boolean);
    } else {
      config.depends = [];
    }
    
    if (config.optional_depends) {
      config.optional_depends = config.optional_depends.split(',').map(dep => dep.trim()).filter(Boolean);
    } else {
      config.optional_depends = [];
    }
    
    return config;
  }

  static async writeModConfig(filePath, config) {
    const configCopy = { ...config };
    
    if (Array.isArray(configCopy.depends)) {
      configCopy.depends = configCopy.depends.join(', ');
    }
    
    if (Array.isArray(configCopy.optional_depends)) {
      configCopy.optional_depends = configCopy.optional_depends.join(', ');
    }
    
    await this.writeConfig(filePath, configCopy);
  }

  static async parseWorldConfig(filePath) {
    const config = await this.parseConfig(filePath);
    
    const booleanFields = ['creative_mode', 'enable_damage', 'enable_pvp', 'server_announce'];
    for (const field of booleanFields) {
      if (config[field] !== undefined) {
        config[field] = config[field] === 'true';
      }
    }
    
    return config;
  }

  static async writeWorldConfig(filePath, config) {
    const configCopy = { ...config };
    
    const booleanFields = ['creative_mode', 'enable_damage', 'enable_pvp', 'server_announce'];
    for (const field of booleanFields) {
      if (typeof configCopy[field] === 'boolean') {
        configCopy[field] = configCopy[field].toString();
      }
    }
    
    await this.writeConfig(filePath, configCopy);
  }

  static async parseGameConfig(filePath) {
    const config = await this.parseConfig(filePath);
    
    // Parse common game config fields
    if (config.name) {
      config.name = config.name.trim();
    }
    if (config.title) {
      config.title = config.title.trim();
    }
    if (config.description) {
      config.description = config.description.trim();
    }
    if (config.author) {
      config.author = config.author.trim();
    }
    
    return config;
  }
}

module.exports = ConfigParser;