/**
 * Configuration manager for the Claude client
 */

import { readFileSync, existsSync } from 'fs';
import { join } from 'path';
import { MCPServerConfig } from './types.js';
import { McpConfigManager } from './mcpConfigManager.js';

export class Config {
  private static envVars: Map<string, string> = new Map();

  /**
   * Load environment variables from .env file
   */
  static load(repoPath: string): void {
    const envPath = join(repoPath, '.env');

    if (!existsSync(envPath)) {
      return;
    }

    try {
      const content = readFileSync(envPath, 'utf-8');
      const lines = content.split('\n');

      for (const line of lines) {
        const trimmed = line.trim();

        // Skip comments and empty lines
        if (!trimmed || trimmed.startsWith('#')) {
          continue;
        }

        const match = trimmed.match(/^([^=]+)=(.*)$/);
        if (match) {
          const key = match[1].trim();
          const value = match[2].trim();
          this.envVars.set(key, value);

          // Also set in process.env if not already set
          if (!process.env[key]) {
            process.env[key] = value;
          }
        }
      }
    } catch (error) {
      console.error(`Warning: Failed to load .env file: ${error}`);
    }
  }

  /**
   * Get environment variable value
   */
  static get(key: string, defaultValue?: string): string {
    return this.envVars.get(key) || process.env[key] || defaultValue || '';
  }

  /**
   * Get the path to gogs-mcp server
   */
  static getGogsMcpPath(): string {
    return this.get('GOGS_MCP_PATH', '/data/gogs-mcp/dist/index.js');
  }

  /**
   * Generate MCP configuration for a repository
   *
   * Priority:
   * 1. Repository-specific config: ~/.config/agent-manager/mcp/{owner}/{repo}.json
   * 2. Global default config: ~/.config/agent-manager/mcp/default.json
   * 3. Hardcoded fallback (gogs-mcp only)
   */
  static generateMcpConfig(repoPath: string, owner?: string, repo?: string): MCPServerConfig {
    const gogsMcpPath = this.getGogsMcpPath();

    // If owner and repo are provided, try to load per-repository config
    if (owner && repo) {
      return McpConfigManager.getMcpConfig(owner, repo, gogsMcpPath);
    }

    // Fallback to hardcoded config
    return {
      mcpServers: {
        gogs: {
          type: 'stdio',
          command: 'node',
          args: [gogsMcpPath],
          env: {}
        }
      }
    };
  }
}