"use client";

import { useEffect, useRef, useState } from "react";
import { useRouter } from "next/navigation";
import { ArrowLeft, ChevronDown, Upload } from "lucide-react";
import Link from "next/link";
import ReactSelect, { type DropdownIndicatorProps, components } from "react-select";
import { useMutation, useQueryClient } from "@tanstack/react-query";
import { Container } from "@/components/common/Container";
import { Card, CardContent } from "@/components/common/Card";
import { Button } from "@/components/common/Button";
import { FormField } from "@/components/app/FormField";
import { beneficiaryApi } from "@/api/beneficiary.api";
import { toFormData } from "@/lib/formData";
import { qk } from "@/lib/queryKeys";
import { useTranslation } from "@/hooks/useTranslation";
import { useKycGate } from "@/hooks/useKycGate";
import { KycGate } from "@/components/app/KycGate";
import { useCountryMeta, useReceiverCountries } from "@/hooks/queries/useBeneficiaries";
import { cn } from "@/lib/utils";

const TRANSACTION_TYPES = ["Bank Transfer", "Mobile Money", "Cash Pickup"];
const DOCUMENT_TYPES = ["NID", "Passport", "Driving Licence"];

const TX_OPTIONS = TRANSACTION_TYPES.map((v) => ({ value: v, label: v }));
const DOC_OPTIONS = [
  { value: "", label: "Select Document Type" },
  ...DOCUMENT_TYPES.map((v) => ({ value: v, label: v })),
];

// eslint-disable-next-line @typescript-eslint/no-explicit-any
function TxDropdownIndicator(props: DropdownIndicatorProps<any>) {
  return (
    <components.DropdownIndicator {...props}>
      <ChevronDown
        className={cn(
          "h-4 w-4 text-slate-400 transition-transform duration-200",
          props.selectProps.menuIsOpen && "rotate-180",
        )}
      />
    </components.DropdownIndicator>
  );
}

const SELECT_CLASSNAMES = {
  control: () =>
    "h-11 cursor-pointer rounded-2xl border border-slate-200 bg-white px-3 text-sm dark:border-white/[0.08] dark:bg-white/[0.04]",
  menu: () =>
    "z-50 mt-1 min-w-full overflow-hidden rounded-xl border border-slate-200 bg-white shadow-lg dark:border-slate-700 dark:bg-slate-900",
  option: ({ isFocused, isSelected }: { isFocused: boolean; isSelected: boolean }) =>
    cn(
      "cursor-pointer px-4 py-2 text-sm",
      isSelected
        ? "bg-brand-600 text-white"
        : isFocused
          ? "bg-slate-100 text-slate-900 dark:bg-slate-800 dark:text-white"
          : "text-slate-700 dark:text-slate-200",
    ),
  singleValue: () => "text-slate-900 dark:text-white",
  indicatorsContainer: () => "text-slate-400 dark:text-slate-500",
  input: () => "text-slate-900 dark:text-white",
  menuList: () => "max-h-60 overflow-y-auto",
};

export default function NewRecipientPage() {
  const { t } = useTranslation();
  const kycGateStatus = useKycGate();
  const router = useRouter();
  const queryClient = useQueryClient();
  const { data: countriesData, isLoading: countriesLoading } = useReceiverCountries();

  const countryOptions = [
    { value: "", label: "— Select —" },
    ...(countriesData?.receiver_country ?? []).map((c) => ({
      value: c.country,
      label: c.country,
    })),
  ];

  const [firstName, setFirstName] = useState("");
  const [middleName, setMiddleName] = useState("");
  const [lastName, setLastName] = useState("");
  const [email, setEmail] = useState("");
  const [country, setCountry] = useState("");

  const { data: countryMeta, isLoading: metaLoading } = useCountryMeta(country);
  type MetaItem = { id: number; name: string };
  // Cash pickup points have a different shape from banks/mobile methods — { id, address }
  // rather than { id, name }.
  type CashPickupItem = { id: number; address: string };
  const bankList: MetaItem[]             = countryMeta?.banks          ?? [];
  const mobileList: MetaItem[]           = countryMeta?.mobile_methods ?? [];
  const cashPickupList: CashPickupItem[] = countryMeta?.cash_pickups   ?? [];

  const bankOptions       = [{ value: "", label: "Select Bank" },        ...bankList.map((b) => ({ value: b.name, label: b.name }))];
  const mobileOptions     = [{ value: "", label: "Select Mobile Method" },...mobileList.map((m) => ({ value: m.name, label: m.name }))];
  const cashPickupOptions = [{ value: "", label: "Select Pickup Point" },...cashPickupList.map((c) => ({ value: c.address, label: c.address }))];

  const [city, setCity] = useState("");
  const [state, setState] = useState("");
  const [zipCode, setZipCode] = useState("");
  const [phone, setPhone] = useState("");
  const [method, setMethod] = useState("Bank Transfer");
  const [bankName, setBankName] = useState("");
  const [ibanNumber, setIbanNumber] = useState("");
  const [accountNumber, setAccountNumber] = useState("");
  const [mobileName, setMobileName] = useState("");
  const [address, setAddress] = useState("");
  const [documentType, setDocumentType] = useState("");
  const [frontImage, setFrontImage] = useState<File | null>(null);
  const [backImage, setBackImage] = useState<File | null>(null);
  const [frontPreview, setFrontPreview] = useState<string | null>(null);
  const [backPreview, setBackPreview] = useState<string | null>(null);

  const frontRef = useRef<HTMLInputElement>(null);
  const backRef = useRef<HTMLInputElement>(null);

  useEffect(() => () => { if (frontPreview) URL.revokeObjectURL(frontPreview); }, [frontPreview]);
  useEffect(() => () => { if (backPreview) URL.revokeObjectURL(backPreview); }, [backPreview]);

  const storeMutation = useMutation({
    mutationFn: (fd: FormData) => beneficiaryApi.store(fd as never),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: qk.beneficiaries.all });
      router.replace("/recipients");
    },
  });

  function onSubmit(e: { preventDefault(): void }) {
    e.preventDefault();

    const base = {
      first_name: firstName,
      middle_name: middleName,
      last_name: lastName,
      email,
      country,
      city,
      state,
      zip_code: zipCode,
      phone,
      method,
      address,
      document_type: documentType,
      front_image: frontImage,
      back_image: backImage,
    };

    const methodFields =
      method === "Bank Transfer"
        ? { bank_name: bankName, iban_number: ibanNumber }
        : method === "Mobile Money"
          ? { mobile_name: mobileName, account_number: accountNumber }
          : method === "Cash Pickup"
            ? { pickup_point: mobileName }
            : {};

    storeMutation.mutate(toFormData({ ...base, ...methodFields }));
  }

  if (kycGateStatus) {
    return <KycGate status={kycGateStatus} />;
  }

  return (
    <Container className="max-w-full space-y-6">
      <Link
        href="/recipients"
        className="inline-flex items-center gap-1.5 text-sm font-semibold text-slate-600 transition hover:text-brand-600 dark:text-slate-300 dark:hover:text-brand-300"
      >
        <ArrowLeft className="h-4 w-4 rtl:-scale-x-100" />
        {t("app.recipients.title")}
      </Link>

      <header>
        <h1 className="text-2xl font-bold tracking-tight text-slate-900 dark:text-white sm:text-3xl">
          {t("app.recipients.new.title")}
        </h1>
      </header>

      <Card>
        <CardContent>
          <form onSubmit={onSubmit} noValidate className="space-y-5">
            {/* Name row */}
            <div className="grid gap-4 sm:grid-cols-3">
              <FormField
                label="First Name"
                placeholder="Enter first name"
                value={firstName}
                onChange={(e) => setFirstName(e.target.value)}
                required
              />
              <FormField
                label="Middle Name"
                placeholder="Enter middle name"
                value={middleName}
                onChange={(e) => setMiddleName(e.target.value)}
              />
              <FormField
                label="Last Name"
                placeholder="Enter last name"
                value={lastName}
                onChange={(e) => setLastName(e.target.value)}
                required
              />
            </div>

            {/* Email */}
            <FormField
              label="Email"
              type="email"
              placeholder="you@example.com"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
            />

            {/* Country / City / State */}
            <div className="grid gap-4 sm:grid-cols-3">
              <div className="space-y-1.5">
                <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                  Country
                </label>
                <ReactSelect
                  unstyled
                  isSearchable
                  isLoading={countriesLoading}
                  components={{ DropdownIndicator: TxDropdownIndicator }}
                  options={countryOptions}
                  value={countryOptions.find((o) => o.value === country) ?? countryOptions[0]}
                  onChange={(opt) => { setCountry((opt as { value: string } | null)?.value ?? ""); setBankName(""); }}
                  classNames={SELECT_CLASSNAMES}
                />
              </div>
              <FormField
                label="City"
                placeholder="Enter city"
                value={city}
                onChange={(e) => setCity(e.target.value)}
              />
              <FormField
                label="State"
                placeholder="Enter state"
                value={state}
                onChange={(e) => setState(e.target.value)}
              />
            </div>

            {/* Zip / Phone */}
            <div className="grid gap-4 sm:grid-cols-2">
              <FormField
                label="Zip Code"
                placeholder="Enter zip code"
                value={zipCode}
                onChange={(e) => setZipCode(e.target.value)}
              />
              <FormField
                label="Phone"
                type="tel"
                placeholder="Enter phone number"
                value={phone}
                onChange={(e) => setPhone(e.target.value)}
              />
            </div>

            {/* Transaction Type */}
            <div className="space-y-1.5">
              <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                Transaction Type <span className="text-rose-500">*</span>
              </label>
              <ReactSelect
                unstyled
                isSearchable={false}
                components={{ DropdownIndicator: TxDropdownIndicator }}
                options={TX_OPTIONS}
                value={TX_OPTIONS.find((o) => o.value === method) ?? null}
                onChange={(opt) => { setMethod((opt as { value: string } | null)?.value ?? "Bank Transfer"); setBankName(""); setMobileName(""); setAccountNumber(""); }}
                classNames={SELECT_CLASSNAMES}
              />
            </div>

            {/* Bank fields */}
            {method === "Bank Transfer" && (
              <div className="grid gap-4 sm:grid-cols-2">
                <div className="space-y-1.5">
                  <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                    Bank Name <span className="text-rose-500">*</span>
                  </label>
                  <ReactSelect
                    unstyled
                    isSearchable
                    isLoading={metaLoading && Boolean(country)}
                    components={{ DropdownIndicator: TxDropdownIndicator }}
                    options={bankOptions}
                    value={bankOptions.find((o) => o.value === bankName) ?? bankOptions[0]}
                    onChange={(opt) => setBankName((opt as { value: string } | null)?.value ?? "")}
                    classNames={SELECT_CLASSNAMES}
                    placeholder={country ? "Select Bank" : "Select country first"}
                  />
                </div>
                <FormField
                  label="IBAN Number"
                  placeholder="Enter IBAN number"
                  value={ibanNumber}
                  onChange={(e) => setIbanNumber(e.target.value)}
                  required
                />
              </div>
            )}

            {/* Mobile Money fields */}
            {method === "Mobile Money" && (
              <div className="grid gap-4 sm:grid-cols-2">
                <div className="space-y-1.5">
                  <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                    Mobile Method <span className="text-rose-500">*</span>
                  </label>
                  <ReactSelect
                    unstyled
                    isSearchable
                    isLoading={metaLoading && Boolean(country)}
                    components={{ DropdownIndicator: TxDropdownIndicator }}
                    options={mobileOptions}
                    value={mobileOptions.find((o) => o.value === mobileName) ?? mobileOptions[0]}
                    onChange={(opt) => setMobileName((opt as { value: string } | null)?.value ?? "")}
                    classNames={SELECT_CLASSNAMES}
                    placeholder={country ? "Select Mobile Method" : "Select country first"}
                  />
                </div>
                <FormField
                  label="Account Number"
                  placeholder="Enter account number"
                  value={accountNumber}
                  onChange={(e) => setAccountNumber(e.target.value)}
                  required
                />
              </div>
            )}

            {/* Cash Pickup fields */}
            {method === "Cash Pickup" && (
              <div className="space-y-1.5">
                <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                  Pickup Point <span className="text-rose-500">*</span>
                </label>
                <ReactSelect
                  unstyled
                  isSearchable
                  isLoading={metaLoading && Boolean(country)}
                  components={{ DropdownIndicator: TxDropdownIndicator }}
                  options={cashPickupOptions}
                  value={cashPickupOptions.find((o) => o.value === mobileName) ?? cashPickupOptions[0]}
                  onChange={(opt) => setMobileName((opt as { value: string } | null)?.value ?? "")}
                  classNames={SELECT_CLASSNAMES}
                  placeholder={country ? "Select Pickup Point" : "Select country first"}
                />
              </div>
            )}

            {/* Address */}
            <div className="space-y-1.5">
              <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                Address
              </label>
              <textarea
                value={address}
                onChange={(e) => setAddress(e.target.value)}
                rows={3}
                placeholder="Enter full address"
                className="w-full rounded-2xl border border-slate-200 bg-white px-4 py-3 text-sm outline-none focus:border-brand-500 dark:border-white/[0.08] dark:bg-white/[0.04] dark:text-white"
              />
            </div>

            {/* Document type + uploads */}
            <div className="grid gap-4 sm:grid-cols-3">
              <div className="space-y-1.5">
                <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                  Document Type
                </label>
                <ReactSelect
                  unstyled
                  isSearchable={false}
                  components={{ DropdownIndicator: TxDropdownIndicator }}
                  options={DOC_OPTIONS}
                  value={DOC_OPTIONS.find((o) => o.value === documentType) ?? DOC_OPTIONS[0]}
                  onChange={(opt) => setDocumentType((opt as { value: string } | null)?.value ?? "")}
                  classNames={SELECT_CLASSNAMES}
                />
              </div>

              {(["front", "back"] as const).map((side) => {
                const _file = side === "front" ? frontImage : backImage;
                const setFile = side === "front" ? setFrontImage : setBackImage;
                const setPreview = side === "front" ? setFrontPreview : setBackPreview;
                const preview = side === "front" ? frontPreview : backPreview;
                const ref = side === "front" ? frontRef : backRef;
                return (
                  <div key={side} className="space-y-1.5">
                    <label className="block text-xs font-semibold uppercase tracking-wider text-slate-500 dark:text-slate-400">
                      {side === "front" ? "Front Part" : "Back Part"}
                    </label>
                    <label
                      className={cn(
                        "relative flex h-28 cursor-pointer overflow-hidden rounded-2xl border-2 border-dashed transition",
                        preview
                          ? "border-brand-400"
                          : "border-slate-200 hover:border-brand-400 dark:border-slate-700",
                      )}
                    >
                      {preview ? (
                        <>
                          <img
                            src={preview}
                            alt={side === "front" ? "Front document" : "Back document"}
                            className="h-full w-full object-contain"
                          />
                          <div className="absolute inset-0 flex items-center justify-center bg-black/40 opacity-0 transition-opacity hover:opacity-100">
                            <span className="rounded bg-black/70 px-2 py-1 text-xs text-white">
                              Click to replace
                            </span>
                          </div>
                        </>
                      ) : (
                        <div className="flex h-full w-full flex-col items-center justify-center gap-2 text-slate-500 dark:text-slate-400">
                          <Upload className="h-5 w-5" />
                          <span className="text-center text-xs">Drop file or click to select</span>
                        </div>
                      )}
                      <input
                        ref={ref}
                        type="file"
                        accept="image/*"
                        className="sr-only"
                        onChange={(e) => {
                          const f = e.target.files?.[0] ?? null;
                          setFile(f);
                          setPreview(f ? URL.createObjectURL(f) : null);
                        }}
                      />
                    </label>
                  </div>
                );
              })}
            </div>

            <Button
              type="submit"
              size="lg"
              loading={storeMutation.isPending}
              className="w-full"
            >
              {storeMutation.isPending ? t("app.recipients.new.saving") : t("app.recipients.new.save")}
            </Button>
          </form>
        </CardContent>
      </Card>
    </Container>
  );
}