const path = require('node:path');
const { BaseIdeSetup } = require('./_base-ide');
const chalk = require('chalk');

/**
 * GitHub Copilot IDE setup handler for WDS
 * Note: GitHub Copilot doesn't support includes/references, so we must copy full agent content
 */
class GitHubCopilotSetup extends BaseIdeSetup {
  constructor() {
    super('github-copilot', 'GitHub Copilot', false);
    this.configFile = '.github/copilot-instructions.md';
  }

  /**
   * Setup GitHub Copilot IDE configuration
   * @param {string} projectDir - Project directory
   * @param {string} wdsDir - WDS installation directory
   * @param {Object} options - Setup options
   */
  async setup(projectDir, wdsDir, options = {}) {
    // Ensure .github directory exists
    const githubDir = path.join(projectDir, '.github');
    await this.ensureDir(githubDir);

    // Get all WDS agents
    const agents = await this.getAgents(wdsDir);

    if (agents.length === 0) {
      throw new Error('No agents found in WDS installation');
    }

    // Build content to append
    let content = '\n\n## WDS Agents\n\n';
    content += '<!-- Generated by WDS installer - Do not edit manually -->\n\n';

    // For each agent, read the full compiled agent content
    let agentCount = 0;
    for (const agent of agents) {
      // Read the full agent content
      const agentContent = await this.readFile(agent.path);

      // Add section header
      content += `### ${agent.metadata.name} - ${agent.metadata.description}\n\n`;

      // Add full agent content
      content += agentContent + '\n\n';
      content += '---\n\n';

      agentCount++;
    }

    // Append to copilot-instructions.md
    const filePath = path.join(projectDir, this.configFile);

    if (await this.exists(filePath)) {
      // File exists, append to it
      const fs = require('fs-extra');
      await fs.appendFile(filePath, content);
    } else {
      // File doesn't exist, create it
      await this.writeFile(filePath, content);
    }

    if (options.logger) {
      options.logger.log(chalk.dim(`    - ${agentCount} agent(s) configured for GitHub Copilot`));
    }

    return {
      success: true,
      agents: agentCount,
    };
  }

  /**
   * Cleanup GitHub Copilot WDS configuration
   * @param {string} projectDir - Project directory
   */
  async cleanup(projectDir) {
    const filePath = path.join(projectDir, this.configFile);

    if (await this.exists(filePath)) {
      // Read file, remove WDS Agents section
      const fs = require('fs-extra');
      const content = await fs.readFile(filePath, 'utf8');

      // Remove WDS Agents section (everything from "## WDS Agents" to the end or next ## section)
      const wdsAgentsRegex = /\n\n## WDS Agents\n\n[\s\S]*?(?=\n\n##\s|$)/;
      const cleanedContent = content.replace(wdsAgentsRegex, '');

      await fs.writeFile(filePath, cleanedContent);
      console.log(chalk.dim(`Removed GitHub Copilot WDS configuration`));
    }
  }

  /**
   * Detect if GitHub Copilot is configured in project
   * @param {string} projectDir - Project directory
   * @returns {boolean}
   */
  async detect(projectDir) {
    return await this.exists(path.join(projectDir, '.github'));
  }
}

module.exports = { GitHubCopilotSetup };