"use client";

import { useEffect, useState, Suspense, useMemo, useCallback } from "react";
import { useSearchParams } from "next/navigation";
import FloatingFooter from "@/components/FloatingFooter";
import { FormSectionHeading } from "@/components/ui/FormSectionHeading";
import { getTodayDate, formatDateToString } from "@/lib/date-utils";
import { parseNumber, formatCurrency } from "@/lib/number-utils";
import { CallDepositFormField } from "@/components/validation/FormFields";
import { useToast } from "@/hooks/useToast";
import { useFormState } from "@/hooks/useFormState";
import { useFormDataLoader, toOption, safeString, safeDate } from "@/hooks/useFormDataLoader";
import { useFormSubmission } from "@/hooks/useFormSubmission";
import { validatePositiveNumber, validateSelectOption, validateDate } from "@/lib/form-validation";
import { ToastComponent } from "@/components/common/Toast";
import { LoadingOverlay } from "@/components/common/LoadingOverlay";
import BankModal from "@/components/common/BankModel";
import PlacementDatePicker from "@/fields/PlacementDate";
import CurrencySelect from "@/fields/Currency";
import BankAdviceRefNoInput from "@/fields/BankAdviceNo";
import DepositAmountInput from "@/fields/DepositAmount";
import InterestRateInput from "@/fields/IntrestPerAnum";
import BankSelect from "@/fields/Bank";
import MaturityDatePicker from "@/fields/MaturityDate";
import TransactionCostsInput from "@/fields/TransactionCost";
import PremiumPaidInput from "@/fields/PremiumPaid";
import FederalTurnoverTaxInput from "@/fields/FederalTurnOver";
import RemarksInput from "@/fields/Remarks";
import PurposeInput from "@/fields/Purpose";

function CallDepositFormContent() {
  const [p_currency, setp_currency] = useState<{ label: string; value: string } | null>(null);
  const [bank, setbank] = useState<{ label: string; value: string } | null>(null);
  const [intrestperanum, setintrestperanum] = useState("");
  const [bankadviserefno, setbankadviserefno] = useState("");
  const [placementdate, setplacementdate] = useState("");
  const [pricepersecurity, setpricepersecurity] = useState("");
  const [effectivedate, seteffectivedate] = useState("");
  const [amount, setamount] = useState("");
  const [commission, setcommission] = useState("");
  const [chargesandfees, setchargesandfees] = useState("");
  const [federalturnovertax, setfederalturnovertax] = useState("");
  const [description, setDescription] = useState("");
  const [remarks, setRemarks] = useState("");
  const [showBankModal, setShowBankModal] = useState(false);

  const searchParams = useSearchParams();
  const editId = searchParams.get("id");
  const isEditing = useMemo(() => Boolean(editId), [editId]);

  // Common hooks
  const { toast, showToast } = useToast();
  const { errors, setErrors, clearError, handleFieldBlur, formRef } = useFormState<CallDepositFormField>();
  const { isSaving, submitForm } = useFormSubmission();

  // Load existing data for edit mode
  const { loadingExisting } = useFormDataLoader({
    editId,
    apiEndpoint: "/api/deposit/calldeposit",
    transformData: (attributes) => {
      setplacementdate(safeDate(attributes.t_date));
      setbank(toOption(attributes.bank_id as string | number | null | undefined, attributes.bank_name as string | number | null | undefined));
      setp_currency(
        toOption(
          (attributes.p_currency || attributes.purchase_currency_code) as string | number | null | undefined,
          attributes.p_currency_label as string | number | null | undefined
        )
      );
      setamount(safeString(attributes.amount));
      setintrestperanum(safeString(attributes.i_rate));
      setchargesandfees(safeString(attributes.b_1 || attributes.transaction_costs));
      setpricepersecurity(safeString(attributes.premium));
      setfederalturnovertax(safeString(attributes.b_2 || attributes.tax));
      setDescription(safeString(attributes.purpose));
      setRemarks(safeString(attributes.remarks));
      setbankadviserefno(safeString(attributes.r_no));
      seteffectivedate(safeDate(attributes.m_date, ""));
    },
    onError: () => {
      showToast("error", "Failed to load call deposit data. Please refresh the page.");
    },
  });

  useEffect(() => {
    setplacementdate(getTodayDate());
  }, []);

  const depositAmountValue = useMemo(() => parseNumber(amount), [amount]);
  const transactionCostsValue = useMemo(() => parseNumber(chargesandfees), [chargesandfees]);
  const premiumValue = useMemo(() => parseNumber(pricepersecurity), [pricepersecurity]);
  const taxValue = useMemo(() => parseNumber(federalturnovertax), [federalturnovertax]);

  const displayAmount = useMemo(() => {
    if (depositAmountValue === 0) return 0;
    return depositAmountValue > 0 ? -depositAmountValue : depositAmountValue;
  }, [depositAmountValue]);

  const interestAmount = useMemo(
    () => displayAmount - transactionCostsValue - premiumValue - taxValue,
    [displayAmount, transactionCostsValue, premiumValue, taxValue]
  );

  const footerData = useMemo(
    () => [
      { label: "Amount", value: formatCurrency(displayAmount) },
      { label: "Transaction Costs", value: formatCurrency(transactionCostsValue) },
      { label: "Premium", value: formatCurrency(premiumValue) },
      { label: "Tax", value: formatCurrency(taxValue) },
      { label: "Interest Amount", value: formatCurrency(interestAmount) },
    ],
    [displayAmount, transactionCostsValue, premiumValue, taxValue, interestAmount]
  );

  const resetForm = useCallback(() => {
    setplacementdate(getTodayDate());
    setp_currency(null);
    setbank(null);
    setbankadviserefno("");
    setpricepersecurity("");
    seteffectivedate("");
    setamount("");
    setcommission("");
    setchargesandfees("");
    setfederalturnovertax("");
    setintrestperanum("");
    setDescription("");
    setRemarks("");
    setErrors({});
  }, [setErrors]);

  const validateField = useCallback(
    (field: CallDepositFormField): string | undefined => {
      switch (field) {
        case "depositAmount":
          return validatePositiveNumber(amount, "Amount");
        case "interestRate":
          return validatePositiveNumber(intrestperanum, "Interest rate per annum");
        case "transactionCosts":
          return validatePositiveNumber(chargesandfees, "Transaction costs");
        case "premium":
          return validatePositiveNumber(pricepersecurity, "Premium");
        case "tax":
          return validatePositiveNumber(federalturnovertax, "Tax");
        case "bank":
          return validateSelectOption(bank, "Bank");
        case "maturityDate":
          return validateDate(effectivedate, "Maturity date");
        default:
          return undefined;
      }
    },
    [amount, intrestperanum, chargesandfees, pricepersecurity, federalturnovertax, bank, effectivedate]
  );

  const validateForm = useCallback(() => {
    const fieldsToValidate: CallDepositFormField[] = [
      "depositAmount",
      "interestRate",
      "transactionCosts",
      "premium",
      "tax",
      "bank",
      "maturityDate",
    ];
    const newErrors: Record<string, string> = {};
    fieldsToValidate.forEach((field) => {
      const message = validateField(field);
      if (message) {
        newErrors[field] = message;
      }
    });
    return newErrors;
  }, [validateField]);

  const updateEndpoint = useMemo(
    () => `/api/deposit/calldeposit/update?id=${encodeURIComponent(editId || "")}`,
    [editId]
  );

  const handleSubmit = useCallback(
    async (e: React.FormEvent<HTMLFormElement>) => {
      e.preventDefault();

      const validationErrors = validateForm();
      if (Object.keys(validationErrors).length > 0) {
        setErrors(validationErrors);
        return;
      }

      setErrors({});

      await submitForm({
        createEndpoint: "/api/deposit/calldeposit/create",
        updateEndpoint,
        getPayload: () => ({
          CallDeposit: {
            p_currency: p_currency?.value ?? "",
            price: parseNumber(pricepersecurity),
            parent_id: 0,
            t_o_t: 1453,
            amount,
            duration: 0,
            duration_other: 1,
            t_date: placementdate,
            r_no: bankadviserefno,
            i_rate: intrestperanum,
            bank_id: bank?.value ?? "",
            maturity: "",
            m_date: "",
            i_b: "",
            commission,
            b_1: "",
            b_2: "",
            a_class: 1465,
            a_type: 1499,
            remarks,
            purpose: description,
            r_link: "",
          },
        }),
        isEditing,
        editId,
        onSuccess: (message) => {
          showToast("success", message);
          if (!isEditing) {
            resetForm();
          }
        },
        onError: (message) => {
          showToast("error", message);
        },
        createSuccessMessage: "Call Deposit saved successfully!",
        updateSuccessMessage: "Call Deposit updated successfully!",
      });
    },
    [
      validateForm,
      setErrors,
      submitForm,
      updateEndpoint,
      p_currency,
      pricepersecurity,
      amount,
      placementdate,
      bankadviserefno,
      intrestperanum,
      bank,
      commission,
      remarks,
      description,
      isEditing,
      editId,
      showToast,
      resetForm,
    ]
  );

  const handleSave = useCallback(() => {
    if (!isSaving && !loadingExisting) {
      formRef.current?.requestSubmit();
    }
  }, [isSaving, loadingExisting, formRef]);

  const handleCloseBankModal = useCallback(() => {
    setShowBankModal(false);
  }, []);

  const pageTitle = useMemo(
    () => (isEditing ? "Update Call Deposit" : "Call Deposit Information"),
    [isEditing]
  );

  const breadcrumbs = useMemo(
    () => [
      { label: "Home", href: "/" },
      { label: "Deposit", href: "/cash/deposit" },
      { label: isEditing ? "Update Call Deposit" : "Create New Call Deposit" },
    ],
    [isEditing]
  );

  return (
    <>
      <ToastComponent toast={toast} />
      <LoadingOverlay isLoading={loadingExisting} message="Loading call deposit data..." />
      <div className="container mx-auto mt-6">
        <div className="bg-white rounded-lg shadow-md border-0">
          <FormSectionHeading
            title={pageTitle}
            eyebrow="Key Details"
            showBackButton
            icon={<i className="bx bx-line-chart" aria-hidden="true" />}
            breadcrumbs={breadcrumbs}
          />

          <div className="p-6 md:p-8 bg-slate-50/60">
            <form ref={formRef} onSubmit={handleSubmit} method="post">
              <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-4">
          {/* Currency */}
          <CurrencySelect
            p_currency={p_currency}
            setp_currency={setp_currency}
          />

          {/* Deposit Amount */}
          <DepositAmountInput<CallDepositFormField>
            amount={amount}
            setamount={setamount}
            clearError={clearError}
            errors={errors}
            handleFieldBlur={handleFieldBlur}
            validateField={validateField}
          />

          {/* Placement Date */}
          <PlacementDatePicker<CallDepositFormField>
            placementdate={placementdate}
            setplacementdate={setplacementdate}
            clearError={clearError}
            errors={errors}
            handleFieldBlur={handleFieldBlur}
            validateField={validateField}
            formatDateToString={formatDateToString}
          />

          {/* Bank Advice Ref No */}
          <BankAdviceRefNoInput
            bankadviserefno={bankadviserefno}
            setbankadviserefno={setbankadviserefno}
          />

          {/* Interest Rate per Annum (%) */}
          <InterestRateInput<CallDepositFormField>
            intrestperanum={intrestperanum}
            setintrestperanum={setintrestperanum}
            clearError={clearError}
            errors={errors}
            handleFieldBlur={handleFieldBlur}
            validateField={validateField}
          />

          {/* Bank */}
          <BankSelect
            bank={bank}
            setbank={setbank}
            setShowBankModal={setShowBankModal}
          />

          {/* Maturity Date */}
          <MaturityDatePicker
            maturitydate={effectivedate}
            setmaturitydate={seteffectivedate}
            formatDateToString={formatDateToString}
          />

          {/* Transaction Costs */}
          <TransactionCostsInput<CallDepositFormField>
            chargesandfees={chargesandfees}
            setchargesandfees={setchargesandfees}
            clearError={clearError}
            errors={errors}
            handleFieldBlur={handleFieldBlur}
            validateField={validateField}
          />

          {/* Premium */}
          <PremiumPaidInput<CallDepositFormField>
            premiumpaid={pricepersecurity}
            setpremiumpaid={setpricepersecurity}
            clearError={clearError}
            errors={errors}
            handleFieldBlur={handleFieldBlur}
            validateField={validateField}
            fieldName="premium"
          />

          {/* Tax */}
          <FederalTurnoverTaxInput
            federalturnovertax={federalturnovertax}
            setfederalturnovertax={setfederalturnovertax}
          />

          {/* Remarks / Comments */}
          <RemarksInput
            remarks={remarks}
            setRemarks={setRemarks}
          />

          {/* Purpose */}
          <PurposeInput
            description={description}
            setDescription={setDescription}
          />

        </div>

        <div className="pb-10" />
      </form>
    </div>
  </div>
      </div>
      {showBankModal && (
        <BankModal isOpen={showBankModal} onClose={handleCloseBankModal} />
      )}
      <FloatingFooter data={footerData} onSave={handleSave} isSaving={isSaving || loadingExisting} />
    </>
  );
}

export default function CallDepositForm() {
  return (
    <Suspense fallback={<div className="p-6 text-center text-sm text-slate-500">Loading form…</div>}>
      <CallDepositFormContent />
    </Suspense>
  );
}