/**
 * Exit survey + referral endpoints.
 *
 * POST /api/v1/survey          — Submit exit survey response
 * GET  /api/v1/survey/:order   — Get survey form data (pre-fill)
 * POST /api/v1/referral/check  — Validate a referral code
 * GET  /api/v1/referral/:email — Get referral code + stats for a customer
 */

import { Router, type Request, type Response } from "express";
import { pool } from "../db.js";

const router = Router();

const TELEGRAM_BOT_TOKEN = process.env.TELEGRAM_BOT_TOKEN || "";
const TELEGRAM_CHAT_ID = process.env.TELEGRAM_CHAT_ID || "";

// POST /api/v1/survey — Submit exit survey
router.post("/api/v1/survey", async (req: Request, res: Response) => {
  try {
    const { order_number, rating, feedback, would_recommend } = req.body ?? {};
    if (!order_number || !rating) {
      res.status(400).json({ error: "order_number and rating required." });
      return;
    }

    // Get customer email from order
    const orderResult = await pool.query(
      "SELECT customer_email, customer_name, service_name FROM compliance_orders WHERE order_number = $1",
      [order_number],
    );
    const order = orderResult.rows[0] as Record<string, unknown> | undefined;
    const email = (order?.customer_email as string) || "";

    await pool.query(
      `INSERT INTO exit_surveys (order_number, customer_email, rating, feedback, would_recommend)
       VALUES ($1, $2, $3, $4, $5)
       ON CONFLICT DO NOTHING`,
      [order_number, email, rating, feedback || null, would_recommend ?? null],
    );

    // Telegram alert for low ratings
    if (rating <= 3 && TELEGRAM_BOT_TOKEN && TELEGRAM_CHAT_ID) {
      const text = `⚠️ Low survey rating\nOrder: ${order_number}\nRating: ${"⭐".repeat(rating)}\nCustomer: ${email}\nFeedback: ${feedback || "(none)"}`;
      fetch(`https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ chat_id: TELEGRAM_CHAT_ID, text }),
      }).catch(() => {});
    }

    // If high rating, return Google review link
    const showReview = rating >= 4;
    const googleReviewUrl = process.env.GOOGLE_REVIEW_URL || "";

    res.json({
      success: true,
      show_review: showReview,
      google_review_url: googleReviewUrl || null,
      referral_code: order ? await getOrCreateReferralCode(email, (order.customer_name as string) || "") : null,
    });
  } catch (err) {
    console.error("[survey] Error:", err);
    res.status(500).json({ error: "Survey submission failed." });
  }
});

// POST /api/v1/referral/check — Validate a referral code
router.post("/api/v1/referral/check", async (req: Request, res: Response) => {
  try {
    const { code } = req.body ?? {};
    if (!code) {
      res.status(400).json({ valid: false, error: "code required." });
      return;
    }

    const result = await pool.query(
      "SELECT code, customer_name FROM referral_codes WHERE code = $1",
      [code.toUpperCase()],
    );

    if (result.rows.length === 0) {
      res.json({ valid: false });
      return;
    }

    res.json({
      valid: true,
      referrer_name: (result.rows[0] as Record<string, unknown>).customer_name,
    });
  } catch {
    res.status(500).json({ valid: false, error: "Check failed." });
  }
});

// GET /api/v1/referral/:email — Get referral info for a customer
router.get("/api/v1/referral/:email", async (req: Request, res: Response) => {
  try {
    const email = req.params.email;
    const result = await pool.query(
      "SELECT code, times_used, total_earned_cents, balance_cents FROM referral_codes WHERE customer_email = $1",
      [email],
    );

    if (result.rows.length === 0) {
      res.json({ has_code: false });
      return;
    }

    const r = result.rows[0] as Record<string, unknown>;
    res.json({
      has_code: true,
      code: r.code,
      times_used: r.times_used,
      total_earned: ((r.total_earned_cents as number) / 100).toFixed(2),
      balance: ((r.balance_cents as number) / 100).toFixed(2),
    });
  } catch {
    res.status(500).json({ error: "Failed." });
  }
});

async function getOrCreateReferralCode(email: string, name: string): Promise<string> {
  // Check if already exists
  const existing = await pool.query(
    "SELECT code FROM referral_codes WHERE customer_email = $1",
    [email],
  );
  if (existing.rows.length > 0) {
    return (existing.rows[0] as Record<string, unknown>).code as string;
  }

  // Generate code from name
  const cleanName = name.replace(/[^a-zA-Z]/g, "").toUpperCase().substring(0, 12);
  let code = `REF-${cleanName || "CUSTOMER"}`;

  // Ensure unique
  const check = await pool.query("SELECT 1 FROM referral_codes WHERE code = $1", [code]);
  if (check.rows.length > 0) {
    code = `${code}${Math.floor(Math.random() * 99)}`;
  }

  await pool.query(
    `INSERT INTO referral_codes (code, customer_email, customer_name)
     VALUES ($1, $2, $3) ON CONFLICT (customer_email) DO NOTHING`,
    [code, email, name],
  );

  return code;
}

export default router;