/**
 * Unit Tests — evolution-loop.js
 *
 * 使用 mock AgentManager 测试 RL Loop 的完整流程，
 * 不实际调用 CLI agents。
 */
import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
import fs from 'fs';
import path from 'path';

const { EvolutionLoop } = require('../../services/evolution-loop');
const { EvolutionMemory, MEMORY_FILE } = require('../../src/core/evolution-memory');

// ══════════════════════════════════════
//  Mock AgentManager
// ══════════════════════════════════════

class MockAgentManager {
  constructor(responses = {}) {
    this.responses = responses;
    this.callLog = [];
  }

  async callAgent(agentName, prompt, options = {}) {
    this.callLog.push({ agent: agentName, prompt: prompt.substring(0, 200) });
    const responseFn = this.responses[agentName];
    const output = responseFn ? responseFn(prompt, this.callLog.length) : `[RESULT: DONE]\n完成${agentName}`;
    return { output };
  }

  async closeAllSessions() {}
}

describe('EvolutionLoop', () => {
  const TMP = '/tmp/test-evolution-loop';
  const SKILL_DIR = path.join(TMP, 'test-skill');

  beforeAll(() => fs.mkdirSync(SKILL_DIR, { recursive: true }));
  afterAll(() => { try { fs.rmSync(TMP, { recursive: true }); } catch {} });

  beforeEach(() => {
    // 清理
    try { fs.rmSync(SKILL_DIR, { recursive: true }); } catch {}
    fs.mkdirSync(SKILL_DIR, { recursive: true });
  });

  // ── 辅助函数 ──

  function setupSkillFiles(score = null) {
    // 创建 SKILL.md
    fs.writeFileSync(path.join(SKILL_DIR, 'SKILL.md'), [
      '---',
      'name: test-skill',
      'description: A test skill for unit testing',
      '---',
      '# Test Skill',
      '## 执行流程',
      '1. 步骤一',
      '2. 步骤二',
      '## 输出格式',
      '- 输出 JSON',
    ].join('\n'));

    // 创建 hunt/knowhow.md
    fs.mkdirSync(path.join(SKILL_DIR, 'hunt'), { recursive: true });
    fs.writeFileSync(path.join(SKILL_DIR, 'hunt', 'knowhow.md'), '# Knowhow\n知识内容');

    // 创建 digest/benchmark.md
    fs.mkdirSync(path.join(SKILL_DIR, 'digest'), { recursive: true });
    fs.writeFileSync(path.join(SKILL_DIR, 'digest', 'benchmark.md'), [
      '# Benchmark',
      '## Scoring Dimensions',
      '| # | Dimension | Weight |',
      '| 1 | Quality   | 50%    |',
      '| 2 | Accuracy  | 50%    |',
    ].join('\n'));
  }

  function createBenchmarkResponse(score) {
    return () => `以下是评估结果：\n\n\`\`\`json\n${JSON.stringify({
      totalScore: score,
      passed: score >= 90,
      passThreshold: 90,
      dimensions: [
        { name: 'Quality', weight: 0.5, score: score, label: score >= 90 ? 'Excellent' : 'Good', feedback: '质量' + (score >= 90 ? '优秀' : '待提升') },
        { name: 'Accuracy', weight: 0.5, score: score, label: score >= 90 ? 'Excellent' : 'Good', feedback: '准确性' + (score >= 90 ? '优秀' : '待提升') },
      ],
      weakDimensions: score < 90 ? ['Quality'] : [],
      strongDimensions: score >= 90 ? ['Quality', 'Accuracy'] : [],
      overallFeedback: `总分 ${score}`,
    }, null, 2)}\n\`\`\`\n\n[RESULT: ${score >= 70 ? 'PASS' : 'FAIL'}]\n评分: ${score}/100`;
  }

  // ══════════════════════════════════════
  //  Tests
  // ══════════════════════════════════════

  describe('_perceive', () => {
    it('should detect empty skill directory', async () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const state = await loop._perceive();
      expect(state.hasSkillMd).toBe(false);
      expect(state.hasKnowhow).toBe(false);
      expect(state.hasBenchmark).toBe(false);
    });

    it('should detect existing skill files', async () => {
      setupSkillFiles();
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const state = await loop._perceive();
      expect(state.hasSkillMd).toBe(true);
      expect(state.hasKnowhow).toBe(true);
      expect(state.hasBenchmark).toBe(true);
    });
  });

  describe('_plan', () => {
    it('should choose "full" for first iteration without SKILL.md', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const state = { hasSkillMd: false, hasKnowhow: false, hasBenchmark: false, previousScore: null };
      const strategy = loop._plan(state, 0);
      expect(strategy.approach).toBe('full');
      expect(strategy.steps).toEqual(['hunt', 'digest', 'skill_create']);
    });

    it('should choose "refine" when previous score >= 70', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const state = { hasSkillMd: true, hasKnowhow: true, hasBenchmark: true, previousScore: 75 };
      const strategy = loop._plan(state, 1);
      expect(strategy.approach).toBe('refine');
      expect(strategy.steps).toEqual(['evolve']);
    });

    it('should choose "restructure" when previous score < 70', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const state = { hasSkillMd: true, hasKnowhow: true, hasBenchmark: true, previousScore: 45 };
      const strategy = loop._plan(state, 1);
      expect(strategy.approach).toBe('restructure');
      expect(strategy.steps).toContain('hunt');
      expect(strategy.steps).toContain('evolve');
    });

    it('should choose "build_benchmark" when SKILL.md exists but no benchmark', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const state = { hasSkillMd: true, hasKnowhow: true, hasBenchmark: false, previousScore: null };
      const strategy = loop._plan(state, 0);
      expect(strategy.approach).toBe('build_benchmark');
      expect(strategy.steps).toContain('digest');
    });
  });

  describe('_parseScoreFromOutput', () => {
    it('should parse JSON code block', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const output = '评估结果：\n```json\n{"totalScore": 85, "passed": false, "weakDimensions": ["accuracy"]}\n```';
      const score = loop._parseScoreFromOutput(output);
      expect(score.totalScore).toBe(85);
      expect(score.passed).toBe(false);
      expect(score.weakDimensions).toContain('accuracy');
    });

    it('should parse plain JSON', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const output = '{"totalScore": 92, "passed": true}';
      const score = loop._parseScoreFromOutput(output);
      expect(score.totalScore).toBe(92);
    });

    it('should fallback to regex extraction', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      const output = '评分结果: 总分：78/100';
      const score = loop._parseScoreFromOutput(output);
      expect(score.totalScore).toBe(78);
    });
  });

  describe('_reflect', () => {
    it('should detect goal achieved', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
        goalScore: 90,
      });

      const score = { totalScore: 92, dimensions: [], weakDimensions: [], strongDimensions: ['Quality'] };
      const reflection = loop._reflect(score, { approach: 'refine' });
      expect(reflection.goalAchieved).toBe(true);
    });

    it('should extract adjustments for weak dimensions', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
        goalScore: 90,
      });

      const score = {
        totalScore: 72,
        dimensions: [
          { name: 'Quality', score: 85, feedback: '质量不错' },
          { name: 'Accuracy', score: 55, feedback: '准确性不足' },
        ],
        weakDimensions: ['Accuracy'],
      };
      const reflection = loop._reflect(score, { approach: 'refine' });
      expect(reflection.goalAchieved).toBe(false);
      expect(reflection.adjustments).toHaveLength(1);
      expect(reflection.adjustments[0].dimension).toBe('Accuracy');
    });

    it('should generate lessons for failed refine at low score', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
        goalScore: 90,
      });

      const score = { totalScore: 40, dimensions: [], weakDimensions: [] };
      const reflection = loop._reflect(score, { approach: 'refine' });
      expect(reflection.lessonsLearned.some(l => l.includes('restructure'))).toBe(true);
    });
  });

  describe('run (full loop)', () => {
    it('should achieve goal in one iteration with high score', async () => {
      setupSkillFiles();
      const manager = new MockAgentManager({
        'innovator-evolver': () => '[RESULT: DONE]\n完成 evolve',
        'benchmark': createBenchmarkResponse(92),
      });

      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test skill',
        skillDir: SKILL_DIR,
        manager,
        maxIterations: 5,
        goalScore: 90,
      });

      const result = await loop.run();
      expect(result.status).toBe('goal_achieved');
      expect(result.finalScore).toBe(92);
      expect(result.iterations).toBe(1);
    });

    it('should iterate when score is below goal', async () => {
      setupSkillFiles();
      let callCount = 0;
      const manager = new MockAgentManager({
        'innovator-evolver': () => '[RESULT: DONE]\n完成 evolve',
        'benchmark': () => {
          callCount++;
          // 第一次 70，第二次 85，第三次 93
          const scores = [70, 85, 93];
          const score = scores[Math.min(callCount - 1, scores.length - 1)];
          return createBenchmarkResponse(score)();
        },
      });

      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test skill',
        skillDir: SKILL_DIR,
        manager,
        maxIterations: 5,
        goalScore: 90,
      });

      const result = await loop.run();
      expect(result.status).toBe('goal_achieved');
      expect(result.finalScore).toBe(93);
      expect(result.iterations).toBeGreaterThan(1);

      // 验证 Memory 被写入
      const memory = new EvolutionMemory(SKILL_DIR);
      expect(memory.getHistory().totalAttempts).toBe(result.iterations);
    });

    it('should return max_iterations when goal not reached', async () => {
      setupSkillFiles();
      const manager = new MockAgentManager({
        'innovator-evolver': () => '[RESULT: DONE]\n完成 evolve',
        'benchmark': createBenchmarkResponse(65), // 始终 65 分
      });

      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test skill',
        skillDir: SKILL_DIR,
        manager,
        maxIterations: 2,
        goalScore: 90,
      });

      const result = await loop.run();
      // 可能是 stagnant (连续分数不变) 或 max_iterations
      expect(['max_iterations', 'stagnant']).toContain(result.status);
      expect(result.bestScore).toBe(65);
    });

    it('should detect stagnation and stop early', async () => {
      setupSkillFiles();
      let callCount = 0;
      const manager = new MockAgentManager({
        'innovator-evolver': () => '[RESULT: DONE]\n完成',
        'benchmark': () => {
          callCount++;
          // 分数几乎不变: 70, 71, 71
          const scores = [70, 71, 71, 71, 71];
          return createBenchmarkResponse(scores[Math.min(callCount - 1, scores.length - 1)])();
        },
      });

      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test skill',
        skillDir: SKILL_DIR,
        manager,
        maxIterations: 5,
        goalScore: 90,
      });

      const result = await loop.run();
      expect(result.status).toBe('stagnant');
      expect(result.iterations).toBeLessThan(5); // 应在 5 轮前停止
    });

    it('should use full strategy for new skill without files', async () => {
      // 不调用 setupSkillFiles — SKILL_DIR 是空的
      const manager = new MockAgentManager({
        'l3-hunt': () => {
          // Hunt 创建 knowhow
          fs.mkdirSync(path.join(SKILL_DIR, 'hunt'), { recursive: true });
          fs.writeFileSync(path.join(SKILL_DIR, 'hunt', 'knowhow.md'), '# Knowhow');
          return '[RESULT: DONE]';
        },
        'l2-digest': () => {
          // Digest 创建 benchmark
          fs.mkdirSync(path.join(SKILL_DIR, 'digest'), { recursive: true });
          fs.writeFileSync(path.join(SKILL_DIR, 'digest', 'benchmark.md'), '# Benchmark');
          return '[RESULT: DONE]';
        },
        'skill-creator': () => {
          // SkillCreate 创建 SKILL.md
          fs.writeFileSync(path.join(SKILL_DIR, 'SKILL.md'), '---\nname: test\n---\n# Test Skill\n## 执行流程\n## 输出格式');
          return '[RESULT: DONE]';
        },
        'benchmark': createBenchmarkResponse(91),
      });

      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test skill',
        skillDir: SKILL_DIR,
        manager,
        maxIterations: 3,
        goalScore: 90,
      });

      const result = await loop.run();
      expect(result.status).toBe('goal_achieved');
      expect(result.finalScore).toBe(91);

      // 验证 agents 被正确调用
      const agentsCalled = manager.callLog.map(c => c.agent);
      expect(agentsCalled).toContain('l3-hunt');
      expect(agentsCalled).toContain('l2-digest');
      expect(agentsCalled).toContain('skill-creator');
    });
  });

  describe('_fallbackScore', () => {
    it('should give higher score for well-structured SKILL.md', () => {
      const manager = new MockAgentManager();
      const loop = new EvolutionLoop({
        skillName: 'test-skill',
        description: 'Test',
        skillDir: SKILL_DIR,
        manager,
      });

      // 空目录
      let score = loop._fallbackScore();
      expect(score.totalScore).toBe(30); // 无 SKILL.md

      // 有 SKILL.md
      setupSkillFiles();
      score = loop._fallbackScore();
      expect(score.totalScore).toBeGreaterThanOrEqual(50); // 有结构的 SKILL.md
    });
  });
});