const fs = require('fs');
const path = require('path');
const { spawn } = require('child_process');
const {
  readQiweiAuthToken,
  ensureQiweiUid,
  readQiweiApiBase,
  saveQiweiClientConfig,
  readQiweiGuid
} = require('../core/credentials');
const { callFmodeWecomGateway, redactSecret } = require('../providers/fmode-wecom-gateway');
const { okResult, errorResult } = require('../core/result-envelope');
const { latestPath } = require('../core/output-paths');
const { QIWEI_MONTHLY_PRICE } = require('../core/subscribe-page');
const { startLoginFlowServer } = require('../core/login-flow-server');
const { startLoginFallbackServer } = require('../core/login-fallback-server');
const { getProductMode } = require('../core/product-mode');
const { recordDeviceGuid } = require('../core/device-broker-mapping');
const { ensureRelayWebhookConfigured, registerRelayTenant } = require('./qiwei-webhook-relay-run');

const QR_STATUS = {
  '-1': '未登录，需要扫码登录',
  '0': '未登录，可尝试免扫码登录',
  '1': '已扫码，等待手机端确认',
  '2': '登录成功',
  '4': '用户在手机端取消了登录',
  '10': '已扫码确认，需要输入手机端 6 位验证码'
};

function authRequiredResult() {
  return {
    status: 'needs_auth',
    assistantMessage: [
      '还没有找到 Fmode 鉴权 token，无法调用由 Fmode 网关转发的企业微信接口。',
      '优先复用 Claude Code 已配置的 Fmode NewAPI sk- token；也可配置 QIWEI_AUTH_TOKEN、FMODE_API_KEY 或平台 sessionToken。',
      '企业微信接口访问凭据和设备上下文由 Fmode 网关管理，技能不会读取或保存。'
    ].join('\n'),
    summary: { configured: false, errorKind: 'missing_auth_token', recoverable: true },
    data: {},
    files: [],
    nextActions: ['配置 Fmode 鉴权 token 后重试'],
    warnings: [],
    errors: []
  };
}

async function ensureRelayAndCallback({ token, apiBase, uid, guid, input }) {
  if (!guid) {
    throw new Error('缺少 guid，无法配置 Relay 回调');
  }

  // 如果还没有租户凭证，先注册
  const relayCreds = require('../core/relay-config');
  if (!relayCreds.isRelayEnabled()) {
    try {
      await registerRelayTenant({ ...input, guid, description: '本地 Skill 自动注册' });
    } catch (err) {
      // 如果已经注册且 force 未开启，可能失败；继续尝试用本地已有凭证配置回调
      if (!relayCreds.getTenantId() || !relayCreds.getTenantApiSecret()) {
        throw err;
      }
    }
  }

  return ensureRelayWebhookConfigured({ ...input, guid, authToken: token, apiBase, uid });
}

function saveQrcodeImage(base64Data) {
  try {
    const filePath = latestPath('login', 'qiwei-login-qrcode.png');
    const data = String(base64Data || '').replace(/^data:image\/\w+;base64,/, '');
    fs.writeFileSync(filePath, Buffer.from(data, 'base64'));
    return filePath;
  } catch {
    return '';
  }
}

function saveQrcodePreviewHtml(qrcodeImagePath) {
  try {
    const htmlPath = latestPath('login', 'qiwei-login-qrcode.html');
    const html = [
      '<!DOCTYPE html>',
      '<html lang="zh-CN">',
      '<head><meta charset="utf-8"><title>企业微信扫码登录</title>',
      '<style>body{font-family:sans-serif;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;margin:0;background:#f5f6f7}img{width:280px;height:280px;border:1px solid #e0e0e0;border-radius:8px;background:#fff;padding:12px}h1{font-size:20px;color:#333}p{color:#666;font-size:14px}</style>',
      '</head>',
      '<body>',
      '<h1>请用手机企业微信扫码登录</h1>',
      `<img src="${path.basename(qrcodeImagePath)}" alt="登录二维码">`,
      '<p>扫码后请在手机上确认登录。二维码约 4 分钟内有效，过期请重新生成。</p>',
      '</body></html>'
    ].join('\n');
    fs.writeFileSync(htmlPath, html, 'utf8');
    return htmlPath;
  } catch {
    return '';
  }
}

function openInBrowser(target) {
  try {
    const platform = process.platform;
    let cmd;
    let args;
    if (platform === 'win32') {
      cmd = 'cmd';
      args = ['/c', 'start', '', target];
    } else if (platform === 'darwin') {
      cmd = 'open';
      args = [target];
    } else {
      cmd = 'xdg-open';
      args = [target];
    }
    const child = spawn(cmd, args, { detached: true, stdio: 'ignore' });
    child.unref();
    return true;
  } catch {
    return false;
  }
}

function gatewayErrorResult(error, stage, fallbackMessage) {
  const safeMessage = redactSecret(error && (error.bizMessage || error.message));
  const kind = String((error && error.kind) || 'upstream');
  if (kind === 'auth') {
    return {
      ...authRequiredResult(),
      assistantMessage: `Fmode 鉴权失败（${safeMessage}）。请更新鉴权 token 后重试。`,
      summary: { stage, errorKind: kind, recoverable: true }
    };
  }
  if (kind === 'billing') {
    return {
      status: 'needs_subscription',
      assistantMessage: `企微订阅未开通、已到期或飞马余额不足（${safeMessage}）。请先调用 qiwei_subscription_status，必要时用 qiwei_subscribe 开通或续费。`,
      summary: { stage, errorKind: kind, recoverable: true },
      data: {},
      files: [],
      nextActions: ['调用 qiwei_subscription_status', '调用 qiwei_subscribe 开通或续费'],
      warnings: [],
      errors: []
    };
  }
  if (kind === 'permission') {
    return {
      status: 'needs_seat',
      assistantMessage: `企微席位或权限不足（${safeMessage}）。请查看订阅状态并增购席位后重试。`,
      summary: { stage, errorKind: kind, recoverable: true },
      data: {},
      files: [],
      nextActions: ['调用 qiwei_subscription_status', '调用 qiwei_subscribe 增购席位'],
      warnings: [],
      errors: []
    };
  }
  return errorResult(`${fallbackMessage}：${safeMessage}`, {
    summary: { stage, errorKind: kind },
    nextActions: ['稍后重试', '若持续失败，请检查 Fmode 网关的企业微信接口状态']
  });
}

function loginBody(uid, guid, extra = {}) {
  return { uid, ...(guid ? { guid } : {}), ...extra };
}

async function qiweiLoginStatus(input = {}) {
  const token = readQiweiAuthToken(input);
  if (!token) return authRequiredResult();
  const uid = ensureQiweiUid(input);
  const guid = readQiweiGuid(input);
  const apiBase = readQiweiApiBase(input);
  try {
    const result = await callFmodeWecomGateway({
      gatewayPath: '/login/status',
      httpMethod: 'GET',
      query: { uid, ...(guid ? { guid } : {}) },
      token,
      apiBase
    });
    const data = result.data || {};
    const online = Boolean(data.online);
    const detail = data.detail || {};
    if (online && detail.userId && input.persistConfig !== false) {
      const resolvedGuid = String(detail.guid || guid || '').trim();
      saveQiweiClientConfig({
        uid,
        guid: resolvedGuid,
        apiBase,
        userId: detail.userId,
        nickname: detail.nickname,
        corpName: detail.corpName,
      });
      if (resolvedGuid) recordDeviceGuid(resolvedGuid, { wecomUserId: detail.userId, nickname: detail.nickname });
    }
    return okResult({
      assistantMessage: data.configured
        ? online
          ? `企业微信设备在线（uid: ${uid}），可以直接调用业务接口。`
          : `企业微信设备当前不在线（状态 ${data.statusCode ?? '未知'}），请调用 qiwei_login_start 重新登录。`
        : `当前 uid（${uid}）尚未配置企业微信设备，请调用 qiwei_login_start 开始扫码登录。`,
      summary: {
        configured: Boolean(data.configured),
        online,
        uid,
        statusCode: data.statusCode ?? null
      },
      data: {
        uid,
        configured: Boolean(data.configured),
        online,
        statusCode: data.statusCode ?? null,
        detail
      },
      nextActions: online ? [] : ['调用 qiwei_login_start 开始扫码登录']
    });
  } catch (error) {
    return gatewayErrorResult(error, 'loginStatus', '查询登录状态失败');
  }
}

function subscriptionRequiredResult({ uid, detail }) {
  return {
    status: 'needs_subscription',
    assistantMessage: [
      `登录前需要先开通企微包月订阅：每个账号 ¥${QIWEI_MONTHLY_PRICE}/月，从飞马余额扣费。`,
      '为保护鉴权凭据，不再生成包含请求凭据的静态付费页面。请重新调用 qiwei_login_start 使用默认动态流程页，或直接调用 qiwei_subscribe 开通。',
      '开通成功后重新调用 qiwei_login_start 进入扫码登录（第 2 步）。',
      detail ? `订阅状态：${detail}` : ''
    ].filter(Boolean).join('\n'),
    summary: { stage: 'loginStart', errorKind: 'subscription_required', uid, dynamicFlowRequired: true, monthlyPrice: QIWEI_MONTHLY_PRICE },
    data: { uid },
    files: [],
    nextActions: ['重新调用 qiwei_login_start 使用默认动态流程页（或调用 qiwei_subscribe）', '开通后继续扫码登录'],
    warnings: [],
    errors: []
  };
}

async function qiweiLoginStart(input = {}) {
  const token = readQiweiAuthToken(input);
  if (!token) return authRequiredResult();
  const uid = ensureQiweiUid(input);
  const guid = readQiweiGuid(input);
  const apiBase = readQiweiApiBase(input);
  if (input.persistConfig !== false) saveQiweiClientConfig({ uid, apiBase });
  if (input.flowUi !== false) {
    try {
      const { url } = await startLoginFlowServer({
        token,
        apiBase,
        uid,
        guid,
        port: input.flowPort,
        onQrcode: (buffer) => {
          try {
            fs.writeFileSync(latestPath('login', 'qiwei-login-qrcode.png'), buffer);
          } catch {}
        }
      });
      const opened = input.openBrowser === false ? false : openInBrowser(url);
      return okResult({
        assistantMessage: [
          `已启动企微登录流程页服务：${url}${opened ? '（已自动打开浏览器）' : ''}。`,
          `页面会自动完成两步流程：未开通订阅时先展示套餐页（每号 ¥${QIWEI_MONTHLY_PRICE}/月，飞马余额扣费），开通后自动生成二维码并每 3 秒自动检测扫码状态，需要验证码时页面会提示输入。`,
          '也可以用 qiwei_login_check 在对话中轮询登录状态。'
        ].join('\n'),
        summary: { uid, flowUrl: url, browserOpened: Boolean(opened), monthlyPrice: QIWEI_MONTHLY_PRICE },
        data: { uid, flowUrl: url, browserOpened: Boolean(opened) },
        nextActions: ['引导用户在流程页完成开通与扫码', '用 qiwei_login_check 轮询登录状态']
      });
    } catch (error) {
      // 流程页服务启动失败时回退到静态二维码流程
    }
  }
  if (input.skipSubscriptionCheck !== true) {
    try {
      const statusResult = await callFmodeWecomGateway({
        gatewayPath: '/subscribe/status',
        httpMethod: 'GET',
        token,
        apiBase,
        cacheBust: true
      });
      const sub = statusResult.data || {};
      if (!sub.subscribed) {
        return subscriptionRequiredResult({ uid, detail: '尚未开通包月订阅' });
      }
    } catch (error) {
      if (error && (error.kind === 'billing' || error.httpStatus === 402)) {
        return subscriptionRequiredResult({ uid, detail: redactSecret(error.message) });
      }
      if (error && error.kind === 'auth') return gatewayErrorResult(error, 'loginStart', '生成登录二维码失败');
      // 订阅状态接口不可用时不阻断登录，由 /login/start 自身订阅校验兑底
    }
  }
  try {
    const result = await callFmodeWecomGateway({
      gatewayPath: '/login/start',
      body: loginBody(uid, guid),
      token,
      apiBase
    });
    const data = result.data || {};
    const qrcodeBase64 = String(data.loginQrcodeBase64Data || '').replace(/^data:image\/\w+;base64,/, '');
    const qrcodeBuffer = qrcodeBase64 ? Buffer.from(qrcodeBase64, 'base64') : null;

    // 优先启动可交互的 fallback 本地服务，让用户能在网页里直接输入验证码
    if (qrcodeBuffer) {
      try {
        const { url } = await startLoginFallbackServer({
          token,
          apiBase,
          uid,
          guid,
          qrcodeBuffer,
          port: 0,
          onQrcode: (buffer) => {
            try {
              fs.writeFileSync(latestPath('login', 'qiwei-login-qrcode.png'), buffer);
            } catch {}
          }
        });
        const opened = input.openBrowser === false ? false : openInBrowser(url);
        return okResult({
          assistantMessage: [
            `企业微信登录二维码已由 Fmode 网关生成（uid: ${uid}）。`,
            opened
              ? `已自动打开扫码登录页：${url}`
              : `请打开扫码登录页：${url}`,
            '页面会自动检测扫码状态；若手机端需要验证码，可直接在页面输入 6 位数字。'
          ].join('\n'),
          summary: {
            uid,
            flowUrl: url,
            fallbackServer: true,
            browserOpened: opened
          },
          data: {
            uid,
            flowUrl: url,
            fallbackServer: true,
            browserOpened: opened
          },
          files: [],
          nextActions: ['在页面中完成扫码与验证码输入', '调用 qiwei_login_check 确认状态']
        });
      } catch {
        // fallback server 启动失败时继续走纯静态兜底
      }
    }

    const filePath = saveQrcodeImage(data.loginQrcodeBase64Data);
    const htmlPath = filePath ? saveQrcodePreviewHtml(filePath) : '';
    const opened = input.openBrowser === false ? false : Boolean(htmlPath && openInBrowser(htmlPath));
    return okResult({
      assistantMessage: [
        `企业微信登录二维码已由 Fmode 网关生成（uid: ${uid}）。`,
        opened
          ? `已自动打开二维码预览页：${htmlPath}`
          : filePath
            ? `请打开或展示二维码图片：${filePath}`
            : 'Fmode 网关未返回可保存的二维码图片，请重试。',
        '用户扫码并在手机上确认后，调用 qiwei_login_check 轮询状态。',
        '如果返回状态 10，请向用户索要 6 位验证码并调用 qiwei_login_verify。'
      ].join('\n'),
      summary: {
        uid,
        qrcodeFile: filePath || null,
        previewFile: htmlPath || null,
        browserOpened: opened,
        fallbackServer: false
      },
      data: {
        uid,
        qrcodeFile: filePath || null,
        previewFile: htmlPath || null,
        browserOpened: opened,
        loginQrcodeBase64Data: filePath ? undefined : data.loginQrcodeBase64Data
      },
      files: [filePath, htmlPath].filter(Boolean),
      nextActions: ['确认用户看到二维码并扫码', '调用 qiwei_login_check 轮询登录状态']
    });
  } catch (error) {
    if (error && (error.kind === 'billing' || error.httpStatus === 402)) {
      return subscriptionRequiredResult({ apiBase, token, uid, detail: redactSecret(error.message) });
    }
    return gatewayErrorResult(error, 'loginStart', '生成登录二维码失败');
  }
}

async function qiweiLoginCheck(input = {}) {
  const token = readQiweiAuthToken(input);
  if (!token) return authRequiredResult();
  const uid = ensureQiweiUid(input);
  const guid = readQiweiGuid(input);
  const apiBase = readQiweiApiBase(input);
  try {
    const result = await callFmodeWecomGateway({
      gatewayPath: '/login/check',
      body: loginBody(uid, guid, { manual: Boolean(input.manual) }),
      token,
      apiBase
    });
    const data = result.data || {};
    const statusCode = String(data.status);
    const statusText = QR_STATUS[statusCode] || `未知状态 ${statusCode}`;
    const detail = data.detail || {};
    if (statusCode === '2') {
      const guid = String(detail.guid || readQiweiGuid(input) || '').trim();
      if (input.persistConfig !== false) {
        saveQiweiClientConfig({
          uid,
          guid,
          apiBase,
          userId: detail.userId,
          nickname: detail.nickname,
          corpName: detail.corpName,
        });
        if (guid) recordDeviceGuid(guid, { wecomUserId: detail.userId, nickname: detail.nickname });
      }

      let relaySetup = null;
      const product = getProductMode(input);
      if (product.mode === 'enterprise') {
        try {
          relaySetup = await ensureRelayAndCallback({ token, apiBase, uid, guid, input });
        } catch (err) {
          console.warn('[Login] Relay 自动配置失败:', err.message);
          relaySetup = { success: false, error: err.message };
        }
      }

      const assistantMessage = product.mode === 'enterprise'
        ? relaySetup?.success
          ? `企业微信登录成功！账号：${detail.nickname || detail.userId || '未知'}。企业版 Relay 回调已自动配置：${relaySetup.callbackUrl}。Relay 消费守护进程会由 MCP/Skill 自动保持运行。`
          : `企业微信登录成功！账号：${detail.nickname || detail.userId || '未知'}。当前为企业版，但 Relay 接入尚未完成，请检查企业 Relay 配置。`
        : `企业微信登录成功！账号：${detail.nickname || detail.userId || '未知'}。当前为个人版，消息由本地主动监听处理并保存在当前项目。`;

      return okResult({
        assistantMessage,
        summary: {
          loggedIn: true,
          uid,
          statusCode: 2,
          userId: detail.userId,
          nickname: detail.nickname,
          corpId: detail.corpId,
          guid,
          productMode: product.mode,
          relaySetup: relaySetup
            ? { success: relaySetup.success, callbackUrl: relaySetup.callbackUrl, error: relaySetup.error }
            : null
        },
        data: { uid, status: detail, guid, product, relaySetup },
        nextActions: relaySetup?.success
          ? ['保持 npm run relay 运行']
          : product.mode === 'enterprise'
            ? ['完成企业 Relay 注册和服务端回调连接']
            : ['在 4320 工作台配置白名单并启动 AI 监听']
      });
    }
    if (statusCode === '10') {
      return {
        status: 'needs_verify_code',
        assistantMessage: '用户已在手机上确认，但需要输入手机端显示的 6 位验证码。请取得验证码后调用 qiwei_login_verify。',
        summary: { loggedIn: false, uid, statusCode: 10 },
        data: { uid, status: detail },
        files: [],
        nextActions: ['向用户索要 6 位验证码', '调用 qiwei_login_verify'],
        warnings: [],
        errors: []
      };
    }
    return okResult({
      assistantMessage: `当前扫码状态：${statusCode}（${statusText}）。${
        ['-1', '1'].includes(statusCode)
          ? '请继续等待用户扫码/确认，3-5 秒后再次调用 qiwei_login_check。'
          : statusCode === '4'
            ? '用户取消了登录，可重新调用 qiwei_login_start。'
            : statusCode === '0'
              ? '可再次调用 qiwei_login_check 并传 manual=true 尝试免扫码登录。'
              : ''
      }`,
      summary: { loggedIn: false, uid, statusCode: Number(statusCode) },
      data: { uid, status: detail },
      nextActions:
        statusCode === '4'
          ? ['重新调用 qiwei_login_start']
          : statusCode === '0'
            ? ['调用 qiwei_login_check，传 manual=true']
            : ['稍后再次调用 qiwei_login_check']
    });
  } catch (error) {
    return gatewayErrorResult(error, 'loginCheck', '检测扫码状态失败');
  }
}

async function qiweiLoginVerify(input = {}) {
  const token = readQiweiAuthToken(input);
  if (!token) return authRequiredResult();
  const uid = ensureQiweiUid(input);
  const guid = readQiweiGuid(input);
  const code = String(input.code || '').trim();
  if (!/^\d{6}$/.test(code)) return errorResult('请提供手机端显示的 6 位数字验证码（入参 code）。');
  const apiBase = readQiweiApiBase(input);
  try {
    await callFmodeWecomGateway({
      gatewayPath: '/login/verify',
      body: loginBody(uid, guid, { code }),
      token,
      apiBase
    });
    return okResult({
      assistantMessage: '验证码已提交。请调用 qiwei_login_check 再次确认登录状态。',
      summary: { verified: true, uid },
      nextActions: ['调用 qiwei_login_check 确认登录状态']
    });
  } catch (error) {
    return gatewayErrorResult(error, 'loginVerify', '验证码校验失败');
  }
}

module.exports = {
  qiweiLoginStatus,
  qiweiLoginStart,
  qiweiLoginCheck,
  qiweiLoginVerify
};