"use client";

import { useEffect, useState } from "react";
import { useParams, useRouter, useSearchParams } from "next/navigation";
import { request } from "@/services/response";
import { formatToman } from "@/lib/money";
import Cookies from "js-cookie";
import Layout from "@/components/layout";

export default function PaymentDetailsPage() {
    const params = useParams();
    const router = useRouter();
    const searchParams = useSearchParams();
    const [payment, setPayment] = useState(null);
    const [loading, setLoading] = useState(true);
    const [error, setError] = useState(null);
    const [paying, setPaying] = useState(false);

    const handleRetryPayment = () => {
        if (!payment?.appointment_uuid) return;
        setPaying(true);
        // بدون XHR: ریدایرکت خالص به entry واحد پرداخت در بک‌اند.
        const apiBase = process.env.NEXT_PUBLIC_API_URL;
        const gateway = payment.gateway || "mellat";
        const ret = encodeURIComponent(`${window.location.origin}/payment/result`);
        window.location.href =
            `${apiBase}/api/v1/payment/order/${payment.appointment_uuid}` +
            `?gateway=${encodeURIComponent(gateway)}&return=${ret}`;
    };

    useEffect(() => {
        // بررسی لاگین بودن کاربر
        const userInfo = Cookies.get("userInfo");
        if (!userInfo) {
            router.push("/login");
            return;
        }

        const fetchPaymentDetails = async () => {
            try {
                setLoading(true);
                const response = await request.getPayment(params.uuid);
                // سازگار با پاسخ flat (جدید) و double-nested (قدیمی)
                setPayment(response?.data?.data ?? response?.data ?? null);
            } catch (err) {
                setError("خطا در دریافت اطلاعات پرداخت");
                console.error("Payment fetch error:", err);
            } finally {
                setLoading(false);
            }
        };

        if (params.uuid) {
            fetchPaymentDetails();
        }
    }, [params.uuid, router]);

    // پس از دیدن جزئیاتِ پرداختِ موفق، خودکار به تاریخچهٔ نوبت‌ها (تب تأییدشده) برو.
    useEffect(() => {
        const isSuccess = searchParams.get("status") === "success" || payment?.status === "success";
        if (isSuccess) {
            const t = setTimeout(() => router.push("/dashboard?sidebar=1"), 4000);
            return () => clearTimeout(t);
        }
    }, [payment, searchParams, router]);

    const getStatusLabel = (status) => {
        const statusMap = {
            pending: "در انتظار پرداخت",
            success: "پرداخت موفق",
            failed: "پرداخت ناموفق",
            canceled: "پرداخت لغو شد",
            refunded: "مسترد شده",
        };
        return statusMap[status] || status;
    };

    const getStatusColor = (status) => {
        const colorMap = {
            pending: "text-yellow-600 bg-yellow-50",
            success: "text-green-600 bg-green-50",
            failed: "text-red-600 bg-red-50",
            canceled: "text-red-600 bg-red-50",
            refunded: "text-gray-600 bg-gray-50",
        };
        return colorMap[status] || "text-gray-600 bg-gray-50";
    };

    const getPaymentMethodLabel = (method) => {
        const methodMap = {
            mellat: "بانک ملت",
            sep: "سامان (سپ)",
            mock: "درگاه آزمایشی",
        };
        return methodMap[method] || method;
    };

    const formatDate = (timestamp) => {
        const date = new Date(parseInt(timestamp) * 1000);
        return new Intl.DateTimeFormat("fa-IR", {
            year: "numeric",
            month: "long",
            day: "numeric",
            hour: "2-digit",
            minute: "2-digit",
        }).format(date);
    };

    const formatAmount = (rials) => formatToman(rials);

    if (loading) {
        return (
            <Layout>
                <div className="flex items-center justify-center min-h-screen">
                    <div className="flex flex-col items-center gap-4">
                        <div className="w-12 h-12 border-4 border-[#5559CE] border-t-transparent rounded-full animate-spin"></div>
                        <p className="text-[#3B3B3B] text-[16px]">در حال بارگذاری...</p>
                    </div>
                </div>
            </Layout>
        );
    }

    if (error) {
        return (
            <Layout>
                <div className="flex items-center justify-center min-h-screen">
                    <div className="bg-red-50 border border-red-200 rounded-lg p-6 max-w-md">
                        <p className="text-red-600 text-center">{error}</p>
                    </div>
                </div>
            </Layout>
        );
    }

    if (!payment) {
        return null;
    }

    return (
        <Layout>
            <div className="container mx-auto px-4 py-8 max-w-4xl mt-20 md:mt-24">
                <div className="bg-white rounded-lg shadow-md border border-gray-200 p-6 md:p-8">
                    <h1 className="text-2xl md:text-3xl font-bold text-[#3B3B3B] mb-6">
                        جزئیات پرداخت
                    </h1>

                    <div className="space-y-4">
                        {/* وضعیت پرداخت */}
                        <div className="flex justify-between items-center py-3 border-b border-gray-100">
                            <span className="text-[#616161] font-medium">وضعیت:</span>
                            <span
                                className={`px-4 py-2 rounded-full font-bold ${getStatusColor( payment.status )}`}
                            >
                                {getStatusLabel(payment.status)}
                            </span>
                        </div>

                        {/* مبلغ */}
                        <div className="flex justify-between items-center py-3 border-b border-gray-100">
                            <span className="text-[#616161] font-medium">مبلغ:</span>
                            <span className="text-[#3B3B3B] font-bold text-lg">
                                {formatAmount(payment.amount_rials)} تومان
                            </span>
                        </div>

                        {/* روش پرداخت */}
                        <div className="flex justify-between items-center py-3 border-b border-gray-100">
                            <span className="text-[#616161] font-medium">روش پرداخت:</span>
                            <span className="text-[#3B3B3B] font-bold">
                                {getPaymentMethodLabel(payment.gateway)}
                            </span>
                        </div>

                        {/* شناسه پرداخت */}
                        <div className="flex justify-between items-center py-3 border-b border-gray-100">
                            <span className="text-[#616161] font-medium">شناسه پرداخت:</span>
                            <span className="text-[#3B3B3B] font-mono text-sm">
                                {payment.uuid}
                            </span>
                        </div>

                        {/* شماره مرجع */}
                        {payment.reference_id && (
                            <div className="flex justify-between items-center py-3 border-b border-gray-100">
                                <span className="text-[#616161] font-medium">شماره مرجع:</span>
                                <span className="text-[#3B3B3B] font-bold">
                                    {payment.reference_id}
                                </span>
                            </div>
                        )}

                        {/* تاریخ ایجاد */}
                        <div className="flex justify-between items-center py-3 border-b border-gray-100">
                            <span className="text-[#616161] font-medium">تاریخ ایجاد:</span>
                            <span className="text-[#3B3B3B]">
                                {formatDate(payment.created_at)}
                            </span>
                        </div>

                        {/* نوع سرویس */}
                        <div className="flex justify-between items-center py-3">
                            <span className="text-[#616161] font-medium">نوع سرویس:</span>
                            <span className="text-[#3B3B3B] font-bold">
                                {payment.type === "appointment" ? "رزرو نوبت" : payment.type}
                            </span>
                        </div>
                    </div>

                    {/* دکمه‌ها */}
                    <div className="mt-8 flex gap-4">
                        {["pending", "failed", "canceled"].includes(payment.status) &&
                            payment.appointment_uuid ? (
                            <button
                                onClick={handleRetryPayment}
                                disabled={paying}
                                className="flex-1 bg-[#5559CE] hover:bg-[#4448b3] disabled:opacity-60 text-white font-bold py-3 px-6 rounded-lg transition-colors"
                            >
                                {paying
                                    ? "در حال انتقال به درگاه..."
                                    : payment.status === "pending"
                                        ? "پرداخت"
                                        : "تلاش مجدد"}
                            </button>
                        ) : null}
                        <button
                            onClick={() => router.push("/dashboard?sidebar=1")}
                            className="flex-1 bg-[#5559CE] hover:bg-[#4448b3] text-white font-bold py-3 px-6 rounded-lg transition-colors"
                        >
                            بازگشت به نوبت های من
                        </button>
                    </div>
                </div>
            </div>
        </Layout>
    );
}