import type { Request, Response, NextFunction } from 'express';
import { verifyAccessToken, verifyBotServiceToken, verifySuperAdminToken } from '../utils/jwt';
import { storage } from '../storage';
import { withTenant, openTenantCtx, openSuperAdminCtx, _tenantCtx } from '../db';
import { eq } from 'drizzle-orm';
import { trackUserActivity } from '../utils/userActivity';

export interface AuthenticatedRequest extends Request {
  user?: any;
  organizationId?: number;
  /** True when the request was authenticated with a bot-service JWT (type: 'bot_service').
   *  Routes should skip bot-trigger logic when this flag is set to prevent message loops. */
  isBotToken?: boolean;
}

export interface SuperAdminRequest extends Request {
  superAdmin?: { id: number; email: string; name?: string };
}

const BILLING_EXEMPT_PREFIXES = [
  '/api/auth/',
  '/api/superadmin/',
  '/api/billing/',
  '/api/health',
];

// Validates Bearer JWT and populates req.user.  After successful auth, opens a
// per-request pg client with SET LOCAL app.current_org_id so all subsequent
// db.* calls in the handler automatically use the tenant-scoped connection.
// This covers every route that uses authenticateToken — no per-route wiring needed.
export const authenticateToken = async (
  req: AuthenticatedRequest,
  res: Response,
  next: NextFunction
) => {
  // Already authenticated as bot-service by tryBotServiceToken — skip user lookup.
  if (req.isBotToken) {
    return next();
  }

  const authHeader = req.headers['authorization'];
  const headerToken = authHeader && authHeader.split(' ')[1];
  const cookieToken = (req as any).cookies?.access_token;
  const token = cookieToken || headerToken;

  if (!token) {
    return res.status(401).json({ error: 'Токен доступа отсутствует' });
  }

  try {
    const decoded = verifyAccessToken(token);
    // Токены ботов (старые с appRole='bot' или любые с type='bot*') не принимаются
    // на пользовательских ресурсах — это закрывает коллизию bot.id ↔ user.id.
    const payloadType = (decoded as { type?: string }).type;
    if (decoded.appRole === 'bot' || (typeof payloadType === 'string' && payloadType.startsWith('bot'))) {
      return res.status(401).json({ error: 'Токены ботов не принимаются на этом ресурсе' });
    }
    // Use JWT organizationId to set tenant context for the users table lookup,
    // preventing auth failure when FORCE RLS is active on the users table.
    const user = await withTenant(decoded.organizationId, () =>
      storage.getUserWithOrganization(decoded.userId)
    );

    if (!user || !user.isActive) {
      return res.status(401).json({ error: 'Пользователь не найден или заблокирован' });
    }
    if (user.organization && !user.organization.isActive) {
      return res.status(403).json({ error: 'Доступ организации заблокирован' });
    }

    req.user = user;
    req.organizationId = user.organizationId;
    trackUserActivity(user.id);

    const isBillingExempt = BILLING_EXEMPT_PREFIXES.some(p => req.path.startsWith(p));
    if (!isBillingExempt && user.organization?.billingBlocked) {
      return res.status(402).json({
        error: 'Доступ приостановлен',
        blocked: true,
        reason: 'insufficient_balance',
        message: 'Баланс организации исчерпан. Обратитесь к администратору для пополнения.',
      });
    }

    // Open a per-request tenant context if one is not already active.
    // SSE connections (text/event-stream) skip the long-lived transaction —
    // their individual DB calls use withTenant point-operations instead.
    if (_tenantCtx.getStore()) {
      return next();
    }
    const isSSE = req.headers.accept?.includes('text/event-stream');
    if (isSSE) {
      return next();
    }

    openTenantCtx(user.organizationId)
      .then((handle) => {
        handle.run(() => {
          const guard = setTimeout(() => {
            console.warn(`[POOL] Force-releasing tenant connection after 30s timeout (${req.method} ${req.path})`);
            handle.release();
          }, 30_000);
          res.once('finish', () => { clearTimeout(guard); handle.release(); });
          res.once('close', () => { clearTimeout(guard); handle.release(); });
          next();
        });
      })
      .catch((err) => next(err as Error));
  } catch {
    return res.status(403).json({ error: 'Недействительный токен' });
  }
};

/**
 * Optional pre-middleware: detects a bot-service JWT (type: 'bot_service') and sets
 * req.isBotToken = true when found.  authenticateToken then skips its user-lookup step.
 *
 * Apply only to routes that must accept both user tokens and bot service tokens, e.g.:
 *   router.post('/…', tryBotServiceToken, authenticateToken, handler)
 *
 * Routes that only ever handle human users must NOT use this middleware, preserving
 * the invariant that req.user is always set after authenticateToken.
 */
export const tryBotServiceToken = (
  req: AuthenticatedRequest,
  _res: Response,
  next: NextFunction
): void => {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];
  if (token) {
    try {
      const botDecoded = verifyBotServiceToken(token);
      req.isBotToken = true;
      req.organizationId = botDecoded.organizationId;
    } catch {
      // Not a bot-service token — authenticateToken will handle it normally.
    }
  }
  next();
};

// Like authenticateToken but also accepts ?token= for file-download routes.
export const authenticateFileToken = async (
  req: AuthenticatedRequest,
  res: Response,
  next: NextFunction
) => {
  const authHeader = req.headers['authorization'];
  const headerToken = authHeader && authHeader.split(' ')[1];
  const queryToken = typeof req.query.token === 'string' ? req.query.token : null;
  const cookieToken = (req as any).cookies?.access_token;
  const token = cookieToken || headerToken || queryToken;

  if (!token) {
    return res.status(401).json({ error: 'Токен доступа отсутствует' });
  }

  try {
    const decoded = verifyAccessToken(token);
    // Токены ботов не принимаются и на файловых ресурсах (та же коллизия id)
    const payloadType = (decoded as { type?: string }).type;
    if (decoded.appRole === 'bot' || (typeof payloadType === 'string' && payloadType.startsWith('bot'))) {
      return res.status(401).json({ error: 'Токены ботов не принимаются на этом ресурсе' });
    }
    const user = await withTenant(decoded.organizationId, () =>
      storage.getUserWithOrganization(decoded.userId)
    );

    if (!user || !user.isActive) {
      return res.status(401).json({ error: 'Пользователь не найден или заблокирован' });
    }
    if (user.organization && !user.organization.isActive) {
      return res.status(403).json({ error: 'Доступ организации заблокирован' });
    }

    req.user = user;
    req.organizationId = user.organizationId;
    trackUserActivity(user.id);

    if (_tenantCtx.getStore()) return next();

    openTenantCtx(user.organizationId)
      .then((handle) => {
        handle.run(() => {
          const guard = setTimeout(() => {
            console.warn(`[POOL] Force-releasing tenant connection after 30s timeout (${req.method} ${req.path})`);
            handle.release();
          }, 30_000);
          res.once('finish', () => { clearTimeout(guard); handle.release(); });
          res.once('close', () => { clearTimeout(guard); handle.release(); });
          next();
        });
      })
      .catch((err) => next(err as Error));
  } catch {
    return res.status(403).json({ error: 'Недействительный токен' });
  }
};

/**
 * @deprecated Use requirePermission(...) instead.
 * Kept for transitional compatibility during the role refactor.
 */
export const requireAdmin = (
  req: AuthenticatedRequest,
  res: Response,
  next: NextFunction
) => {
  const role = req.user?.appRole;
  if (!req.user || role !== 'admin') {
    return res.status(403).json({ error: 'Требуются права администратора' });
  }
  next();
};

// Permission cache (appRole slug -> string[] of permission codes)
let _permissionCache: Map<string, string[]> | null = null;
let _permissionCacheTs = 0;
const PERMISSION_CACHE_TTL = 60_000; // 1 minute

async function loadPermissionCache(): Promise<Map<string, string[]>> {
  const now = Date.now();
  if (_permissionCache && (now - _permissionCacheTs) < PERMISSION_CACHE_TTL) {
    return _permissionCache;
  }
  const { db } = await import('../db');
  const { appRoles: arTable, permissions: pTable, appRolePermissions: arpTable } = await import('@shared/schema');
  const rows = await db.select({
    appRoleSlug: arTable.slug,
    permissionCode: pTable.code,
  }).from(arpTable)
    .innerJoin(arTable, eq(arpTable.appRoleId, arTable.id))
    .innerJoin(pTable, eq(arpTable.permissionId, pTable.id));
  const map = new Map<string, string[]>();
  for (const r of rows) {
    if (!map.has(r.appRoleSlug)) map.set(r.appRoleSlug, []);
    map.get(r.appRoleSlug)!.push(r.permissionCode);
  }
  _permissionCache = map;
  _permissionCacheTs = now;
  return map;
}

export async function hasAppRolePermission(appRole: string, ...codes: string[]): Promise<boolean> {
  const cache = await loadPermissionCache();
  const perms = cache.get(appRole) || [];
  return codes.some(c => perms.includes(c));
}

export const requirePermission = (...codes: string[]) => {
  return async (req: AuthenticatedRequest, res: Response, next: NextFunction) => {
    if (!req.user) {
      return res.status(403).json({ error: 'Нет доступа' });
    }
    const role = req.user.appRole;
    if (!role) {
      return res.status(403).json({ error: 'Нет доступа' });
    }
    const has = await hasAppRolePermission(role, ...codes);
    if (!has) {
      return res.status(403).json({ error: 'Недостаточно прав' });
    }
    next();
  };
};

/**
 * Requires either a global app-role permission OR admin-level access to the
 * form identified by `formIdParam` (author or formAccessRules.accessLevel === 'admin').
 * Use this for mutating form endpoints so that form admins can manage their own
 * forms without needing the global `forms.manage` permission.
 */
export const requireFormAdminOrPermission = (permissionCode: string, formIdParam = 'id') => {
  return async (req: AuthenticatedRequest, res: Response, next: NextFunction) => {
    if (!req.user) {
      return res.status(403).json({ error: 'Нет доступа' });
    }
    const role = req.user.appRole;
    if (!role) {
      return res.status(403).json({ error: 'Нет доступа' });
    }
    const hasGlobal = await hasAppRolePermission(role, permissionCode);
    if (hasGlobal) {
      return next();
    }

    const rawFormId = req.params[formIdParam];
    const formId = typeof rawFormId === 'string' ? parseInt(rawFormId, 10) : NaN;
    if (!isNaN(formId) && req.organizationId) {
      const isFormAdmin = await storage.canUserAccessForm(req.user.id, formId, req.organizationId, 'admin');
      if (isFormAdmin) {
        return next();
      }
    }

    return res.status(403).json({ error: 'Недостаточно прав' });
  };
};

export const requireActiveUser = (
  req: AuthenticatedRequest,
  res: Response,
  next: NextFunction
) => {
  if (!req.user || !req.user.isActive) {
    return res.status(403).json({ error: 'Аккаунт заблокирован' });
  }
  next();
};

// Validates superadmin JWT and opens a per-request SA-scoped connection
// (SET LOCAL app.is_superadmin='true') so all storage queries in any
// superadmin route automatically bypass tenant RLS.
export const requireSuperAdmin = async (
  req: SuperAdminRequest,
  res: Response,
  next: NextFunction
): Promise<void> => {
  const authHeader = req.headers['authorization'];
  const headerToken = authHeader && authHeader.split(' ')[1];
  const cookieToken = (req as any).cookies?.superadmin_token;
  const token = headerToken || cookieToken;

  if (!token) {
    res.status(401).json({ error: 'Токен суперадмина отсутствует' });
    return;
  }

  try {
    const payload = verifySuperAdminToken(token);
    const admin = await storage.getSuperAdminById(payload.superAdminId);
    if (!admin) {
      res.status(403).json({ error: 'Суперадмин не найден или был удалён' });
      return;
    }
    req.superAdmin = { id: admin.id, email: admin.email };
  } catch {
    res.status(403).json({ error: 'Недействительный токен суперадмина' });
    return;
  }

  if (req.headers.accept?.includes('text/event-stream')) {
    next();
    return;
  }

  openSuperAdminCtx()
    .then((handle) => {
      handle.run(() => {
        const guard = setTimeout(() => {
          console.warn(`[POOL] Force-releasing superadmin connection after 30s timeout (${req.method} ${req.path})`);
          handle.release();
        }, 30_000);
        res.once('finish', () => { clearTimeout(guard); handle.release(); });
        res.once('close', () => { clearTimeout(guard); handle.release(); });
        next();
      });
    })
    .catch((err) => next(err as Error));
};