/**
 * Auto Fixer - 自动修复器
 * 
 * 职责：
 * 1. 路由修复请求到Level 1-3
 * 2. 执行Level 1自动修复
 * 3. 生成Level 2修复方案
 * 4. 标记Level 3人工处理
 * 5. 验证修复结果
 * 
 * @module testing/tools/auto-fixer
 * @version 1.0.0
 */

import * as fs from 'fs/promises';
import * as path from 'path';
import type { AIAnalysisResult, FileChange } from './types';

/**
 * 自动修复器
 */
export class AutoFixer {
  /**
   * 执行修复
   * @param analysis - AI分析结果
   * @returns 修复是否成功
   */
  async fix(analysis: AIAnalysisResult): Promise<boolean> {
    console.log(`[AutoFixer] 开始修复: ${analysis.testResult.testId}`);
    console.log(`[AutoFixer] 修复Level: ${analysis.fixLevel}`);

    switch (analysis.fixLevel) {
      case 'level1':
        return await this.fixLevel1(analysis);
      case 'level2':
        return await this.fixLevel2(analysis);
      case 'level3':
        return await this.fixLevel3(analysis);
      default:
        return false;
    }
  }

  /**
   * Level 1: 全自动修复
   */
  private async fixLevel1(analysis: AIAnalysisResult): Promise<boolean> {
    console.log('[AutoFixer] Level 1 - 全自动修复');

    if (!analysis.suggestedFix) {
      console.log('[AutoFixer] 无修复建议，跳过');
      return false;
    }

    try {
      // 1. 备份文件
      await this.backupFiles(analysis.suggestedFix.changes);

      // 2. 应用修复
      for (const change of analysis.suggestedFix.changes) {
        await this.applyChange(change);
      }

      // 3. 验证语法
      const syntaxValid = await this.verifySyntax(analysis.suggestedFix.changes);
      if (!syntaxValid) {
        console.log('[AutoFixer] 语法验证失败，回滚');
        await this.rollback(analysis.suggestedFix.changes);
        return false;
      }

      // 4. 自动commit
      await this.autoCommit(analysis);

      console.log('[AutoFixer] ✅ Level 1修复完成');
      return true;
    } catch (error) {
      console.error('[AutoFixer] Level 1修复失败:', error);
      await this.rollback(analysis.suggestedFix.changes);
      return false;
    }
  }

  /**
   * Level 2: 半自动修复（生成方案）
   */
  private async fixLevel2(analysis: AIAnalysisResult): Promise<boolean> {
    console.log('[AutoFixer] Level 2 - 生成修复方案（需人工审查）');

    if (!analysis.suggestedFix) {
      console.log('[AutoFixer] 无修复建议');
      return false;
    }

    // 生成修复方案文件
    const proposalPath = path.join(
      process.cwd(),
      'test',
      `fix-proposal-${analysis.testResult.testId}.md`
    );

    const proposal = this.generateFixProposal(analysis);
    await fs.writeFile(proposalPath, proposal, 'utf-8');

    console.log(`[AutoFixer] 修复方案已生成: ${proposalPath}`);
    console.log('[AutoFixer] ⚠️ 需要人工审查和确认');
    return false; // 返回false表示需要人工处理
  }

  /**
   * Level 3: 人工处理
   */
  private async fixLevel3(analysis: AIAnalysisResult): Promise<boolean> {
    console.log('[AutoFixer] Level 3 - 需要人工处理');
    console.log(`[AutoFixer] 问题类型: ${analysis.problemCategory}`);
    console.log(`[AutoFixer] 根本原因: ${analysis.rootCause.description}`);
    console.log('[AutoFixer] ⚠️ 此问题需要人工介入');
    return false;
  }

  /**
   * 应用文件变更
   */
  private async applyChange(change: FileChange): Promise<void> {
    console.log(`[AutoFixer] 应用变更: ${change.filePath}`);

    const content = await fs.readFile(change.filePath, 'utf-8');
    const newContent = content.replace(change.oldContent, change.newContent);
    await fs.writeFile(change.filePath, newContent, 'utf-8');
  }

  /**
   * 备份文件
   */
  private async backupFiles(changes: FileChange[]): Promise<void> {
    for (const change of changes) {
      const backupPath = `${change.filePath}.backup`;
      await fs.copyFile(change.filePath, backupPath);
    }
  }

  /**
   * 验证语法
   */
  private async verifySyntax(changes: FileChange[]): Promise<boolean> {
    // TODO: 实际的语法验证（使用TypeScript编译器或ESLint）
    return true;
  }

  /**
   * 回滚变更
   */
  private async rollback(changes: FileChange[]): Promise<void> {
    console.log('[AutoFixer] 回滚变更...');
    for (const change of changes) {
      const backupPath = `${change.filePath}.backup`;
      await fs.copyFile(backupPath, change.filePath);
      await fs.unlink(backupPath);
    }
  }

  /**
   * 自动提交
   */
  private async autoCommit(analysis: AIAnalysisResult): Promise<void> {
    if (!analysis.suggestedFix) return;

    console.log('[AutoFixer] 自动提交变更...');
    // TODO: 实际的git操作
    console.log(`[AutoFixer] Commit message: ${analysis.suggestedFix.commitMessage}`);
  }

  /**
   * 生成修复方案
   */
  private generateFixProposal(analysis: AIAnalysisResult): string {
    const lines: string[] = [];

    lines.push(`# 修复方案 - ${analysis.testResult.testId}`);
    lines.push('');
    lines.push(`> **生成时间**: ${analysis.timestamp}`);
    lines.push(`> **修复Level**: Level 2（需人工审查）`);
    lines.push('');
    lines.push('## 问题分析');
    lines.push('');
    lines.push(`**问题类型**: ${analysis.problemCategory}`);
    lines.push(`**置信度**: ${(analysis.confidenceScore * 100).toFixed(0)}%`);
    lines.push(`**根本原因**: ${analysis.rootCause.description}`);
    lines.push('');
    lines.push('## 建议修复');
    lines.push('');

    if (analysis.suggestedFix) {
      lines.push(`**修复类型**: ${analysis.suggestedFix.fixType}`);
      lines.push(`**风险等级**: ${analysis.suggestedFix.riskLevel}`);
      lines.push('');
      lines.push('### 变更内容');
      lines.push('');

      for (const change of analysis.suggestedFix.changes) {
        lines.push(`**文件**: \`${change.filePath}\``);
        lines.push('');
        lines.push('```diff');
        lines.push(`- ${change.oldContent}`);
        lines.push(`+ ${change.newContent}`);
        lines.push('```');
        lines.push('');
      }

      lines.push('### 验证步骤');
      lines.push('');
      analysis.suggestedFix.verificationSteps.forEach((step, i) => {
        lines.push(`${i + 1}. ${step}`);
      });
      lines.push('');
    }

    lines.push('## 审查清单');
    lines.push('');
    lines.push('- [ ] 变更符合业务逻辑');
    lines.push('- [ ] 不影响其他功能');
    lines.push('- [ ] 测试覆盖充分');
    lines.push('- [ ] 文档已同步更新');
    lines.push('');

    return lines.join('\n');
  }
}

/**
 * 便捷函数：执行修复
 */
export async function fix(analysis: AIAnalysisResult): Promise<boolean> {
  const fixer = new AutoFixer();
  return await fixer.fix(analysis);
}