/**
 * Phase IV — 对话驱动分析 E2E 测试
 *
 * 测试覆盖：
 *   1. 登录 + Session + 上传数据
 *   2. analyze 意图 → analysis_plan SSE 事件推送
 *   3. LLM 方案说明生成
 *   4. ask_user 确认卡片推送
 *   5. 旧 /workflow/plan API 向后兼容（B2）
 *   6. AVAILABLE_TOOLS 配置化验证（无硬编码残留）
 *   7. 对话历史 — analyze 消息验证
 *
 * 运行方式：npx tsx scripts/test-ssa-phase4-e2e.ts
 */

import { readFileSync } from 'fs';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const BASE_URL = 'http://localhost:3000';
const TEST_PHONE = '13800000001';
const TEST_PASSWORD = '123456';
const TEST_CSV_PATH = join(__dirname, '../../docs/03-业务模块/SSA-智能统计分析/05-测试文档/test.csv');

let passed = 0;
let failed = 0;
let skipped = 0;
let token = '';
let sessionId = '';

// ────────────────────────────────────────────
// Helpers
// ────────────────────────────────────────────

function assert(condition: boolean, testName: string, detail?: string) {
  if (condition) {
    console.log(`  ✅ ${testName}`);
    passed++;
  } else {
    console.log(`  ❌ ${testName}${detail ? ` — ${detail}` : ''}`);
    failed++;
  }
}

function skip(testName: string, reason: string) {
  console.log(`  ⏭️  ${testName} — 跳过：${reason}`);
  skipped++;
}

function section(title: string) {
  console.log(`\n${'─'.repeat(60)}`);
  console.log(`📋 ${title}`);
  console.log('─'.repeat(60));
}

function authHeaders(contentType?: string): Record<string, string> {
  const h: Record<string, string> = { Authorization: `Bearer ${token}` };
  if (contentType) h['Content-Type'] = contentType;
  return h;
}

async function apiPost(path: string, body: any, headers?: Record<string, string>): Promise<any> {
  const res = await fetch(`${BASE_URL}${path}`, {
    method: 'POST',
    headers: headers || authHeaders('application/json'),
    body: typeof body === 'string' ? body : JSON.stringify(body),
  });
  const text = await res.text();
  try { return { status: res.status, data: JSON.parse(text) }; }
  catch { return { status: res.status, data: text }; }
}

async function apiGet(path: string): Promise<any> {
  const res = await fetch(`${BASE_URL}${path}`, {
    method: 'GET',
    headers: authHeaders(),
  });
  const text = await res.text();
  try { return { status: res.status, data: JSON.parse(text) }; }
  catch { return { status: res.status, data: text }; }
}

async function chatSSE(sid: string, content: string, metadata?: Record<string, any>, timeoutMs = 120000): Promise<{
  status: number;
  events: any[];
  fullContent: string;
  intentMeta: any | null;
  askUserEvent: any | null;
  analysisPlan: any | null;
  planConfirmed: any | null;
  errorEvent: any | null;
}> {
  const controller = new AbortController();
  const timer = setTimeout(() => controller.abort(), timeoutMs);

  const events: any[] = [];
  let fullContent = '';
  let intentMeta: any = null;
  let askUserEvent: any = null;
  let analysisPlan: any = null;
  let planConfirmed: any = null;
  let errorEvent: any = null;

  try {
    const body: any = { content };
    if (metadata) body.metadata = metadata;

    const res = await fetch(`${BASE_URL}/api/v1/ssa/sessions/${sid}/chat`, {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${token}`,
        'Content-Type': 'application/json',
        Accept: 'text/event-stream',
      },
      body: JSON.stringify(body),
      signal: controller.signal,
    });

    if (!res.ok || !res.body) {
      clearTimeout(timer);
      return { status: res.status, events: [], fullContent: '', intentMeta: null, askUserEvent: null, analysisPlan: null, planConfirmed: null, errorEvent: null };
    }

    const reader = res.body.getReader();
    const decoder = new TextDecoder();
    let buffer = '';

    while (true) {
      const { done, value } = await reader.read();
      if (done) break;

      buffer += decoder.decode(value, { stream: true });
      const lines = buffer.split('\n');
      buffer = lines.pop() || '';

      for (const line of lines) {
        if (!line.trim() || line.startsWith(': ')) continue;
        if (!line.startsWith('data: ')) continue;
        const data = line.slice(6).trim();
        if (data === '[DONE]') continue;

        try {
          const parsed = JSON.parse(data);
          events.push(parsed);

          if (parsed.type === 'intent_classified') intentMeta = parsed;
          if (parsed.type === 'ask_user') askUserEvent = parsed;
          if (parsed.type === 'analysis_plan') analysisPlan = parsed;
          if (parsed.type === 'plan_confirmed') planConfirmed = parsed;
          if (parsed.type === 'error') errorEvent = parsed;

          const delta = parsed.choices?.[0]?.delta;
          if (delta?.content) fullContent += delta.content;
        } catch {}
      }
    }

    clearTimeout(timer);
    return { status: res.status, events, fullContent, intentMeta, askUserEvent, analysisPlan, planConfirmed, errorEvent };
  } catch (e: any) {
    clearTimeout(timer);
    if (e.name === 'AbortError') {
      return { status: 408, events, fullContent, intentMeta, askUserEvent, analysisPlan, planConfirmed, errorEvent };
    }
    throw e;
  }
}

// ────────────────────────────────────────────
// Tests
// ────────────────────────────────────────────

async function test1_login() {
  section('Test 1: 登录认证');
  const res = await apiPost('/api/v1/auth/login/password', { phone: TEST_PHONE, password: TEST_PASSWORD });
  assert(res.status === 200, `登录返回 200（实际 ${res.status}）`);
  token = res.data?.data?.tokens?.accessToken || res.data?.accessToken || '';
  assert(token.length > 0, `获取到 JWT Token（长度: ${token.length}）`);
}

async function test2_createSession() {
  section('Test 2: 创建 Session + 上传数据');

  try {
    const csvData = readFileSync(TEST_CSV_PATH);
    const boundary = '----TestBoundary' + Date.now();
    const body = Buffer.concat([
      Buffer.from(`--${boundary}\r\nContent-Disposition: form-data; name="file"; filename="test.csv"\r\nContent-Type: text/csv\r\n\r\n`),
      csvData,
      Buffer.from(`\r\n--${boundary}--\r\n`),
    ]);

    const res = await fetch(`${BASE_URL}/api/v1/ssa/sessions`, {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${token}`,
        'Content-Type': `multipart/form-data; boundary=${boundary}`,
      },
      body,
    });

    const data = await res.json();
    assert(res.status === 200 || res.status === 201, `创建 Session 返回 2xx（实际 ${res.status}）`);

    sessionId = data?.sessionId || data?.data?.sessionId || data?.id || '';
    assert(sessionId.length > 0, `获取到 sessionId: ${sessionId.substring(0, 8)}...`);

    if (sessionId) {
      // 触发数据概览 + PICO 推断流水线
      const streamRes = await fetch(`${BASE_URL}/api/v1/ssa/sessions/${sessionId}/data-context/stream`, {
        headers: { Authorization: `Bearer ${token}`, Accept: 'text/event-stream' },
      });
      const streamText = await streamRes.text();
      const hasOverview = streamText.includes('data_overview_complete');
      assert(hasOverview, `数据概览生成完成`);
      await new Promise(r => setTimeout(r, 2000));
    }
  } catch (e: any) {
    assert(false, '创建 Session 失败', e.message);
  }
}

async function test3_analyzeIntent() {
  section('Test 3: analyze 意图 → analysis_plan SSE 事件');
  if (!sessionId) { skip('analyze 意图', '无 sessionId'); return; }

  const result = await chatSSE(sessionId, '请执行分析：比较两组患者的BMI差异，用独立样本T检验');

  assert(result.status === 200, `SSE 返回 200`);
  assert(result.intentMeta?.intent === 'analyze', `意图分类为 analyze（实际: ${result.intentMeta?.intent}）`);

  if (result.analysisPlan) {
    const plan = result.analysisPlan.plan;
    assert(!!plan, `收到 analysis_plan 事件`);
    assert(!!plan?.workflow_id, `plan 包含 workflow_id: ${plan?.workflow_id?.substring(0, 8)}...`);
    assert(plan?.total_steps > 0, `plan 包含 ${plan?.total_steps} 个步骤`);
    assert(result.fullContent.length > 50, `LLM 生成方案说明（${result.fullContent.length} 字符）`);
  } else {
    skip('analysis_plan 事件', 'planWorkflow 可能因数据不足失败');
  }
}

async function test4_askUserCard() {
  section('Test 4: analyze 确认卡片（ask_user）');
  if (!sessionId) { skip('ask_user 卡片', '无 sessionId'); return; }

  const result = await chatSSE(sessionId, '对BMI和年龄做相关分析');

  if (result.askUserEvent) {
    assert(result.askUserEvent.inputType === 'confirm', `inputType 为 confirm（实际: ${result.askUserEvent.inputType}）`);
    assert(!!result.askUserEvent.questionId, `包含 questionId`);
    const options = result.askUserEvent.options || [];
    const hasConfirm = options.some((o: any) => o.value === 'confirm_plan');
    const hasChange = options.some((o: any) => o.value === 'change_method');
    assert(hasConfirm, `包含"确认执行"选项`);
    assert(hasChange, `包含"修改方案"选项`);
  } else {
    skip('ask_user 确认卡片', '未收到 ask_user 事件（planWorkflow 可能未生成完整计划）');
  }
}

async function test5_oldWorkflowAPI() {
  section('Test 5: 旧 /workflow/plan API 向后兼容（B2）');
  if (!sessionId) { skip('旧 API', '无 sessionId'); return; }

  const res = await apiPost('/api/v1/ssa/workflow/plan', {
    sessionId,
    userQuery: '对BMI做描述性统计',
  });

  assert(res.status === 200, `旧 API 返回 200（实际 ${res.status}）`);
  if (res.status === 200) {
    const plan = res.data?.plan;
    assert(!!plan?.workflow_id, `返回 WorkflowPlan（workflow_id: ${plan?.workflow_id?.substring(0, 8)}...）`);
    assert(plan?.total_steps > 0, `包含 ${plan?.total_steps} 个步骤`);
  }
}

async function test6_noHardcodedTools() {
  section('Test 6: AVAILABLE_TOOLS 配置化验证');

  const res = await chatSSE(sessionId, '帮我做T检验分析组间差异');

  if (res.analysisPlan?.plan) {
    const steps = res.analysisPlan.plan.steps || [];
    for (const step of steps) {
      assert(typeof step.tool_name === 'string' && step.tool_name.length > 0,
        `步骤 ${step.step_number} 工具名有效: ${step.tool_name}`);
    }
  } else {
    assert(res.fullContent.length > 0, `LLM 生成了回复（可能因数据不足未生成计划）`);
  }
}

async function test7_chatHistory() {
  section('Test 7: 对话历史 — analyze 消息验证');
  if (!sessionId) { skip('历史', '无 sessionId'); return; }

  const res = await apiGet(`/api/v1/ssa/sessions/${sessionId}/chat/history`);
  assert(res.status === 200, `历史 API 返回 200`);

  if (res.status === 200) {
    const messages = res.data?.messages || [];
    assert(messages.length > 0, `有历史消息（${messages.length} 条）`);

    const analyzeMessages = messages.filter((m: any) =>
      (m.intent === 'analyze' || m.metadata?.intent === 'analyze') && m.role === 'assistant'
    );
    assert(analyzeMessages.length > 0, `有 analyze 意图消息（${analyzeMessages.length} 条）`);

    const generating = messages.filter((m: any) => m.status === 'generating');
    assert(generating.length === 0, `无残留 generating 状态`);
  }
}

// ────────────────────────────────────────────
// Main
// ────────────────────────────────────────────

async function main() {
  console.log('═'.repeat(60));
  console.log('  Phase IV E2E 测试 — 对话驱动分析 + QPER 集成');
  console.log('═'.repeat(60));

  await test1_login();
  await test2_createSession();
  await test3_analyzeIntent();
  await test4_askUserCard();
  await test5_oldWorkflowAPI();
  await test6_noHardcodedTools();
  await test7_chatHistory();

  console.log(`\n${'═'.repeat(60)}`);
  console.log(`  Phase IV E2E 测试结果: ${passed} passed / ${failed} failed / ${skipped} skipped`);
  console.log('═'.repeat(60));

  process.exit(failed > 0 ? 1 : 0);
}

main().catch(e => {
  console.error('❌ 测试运行失败:', e);
  process.exit(1);
});