"use client";

import * as React from "react";

import { zodResolver } from "@hookform/resolvers/zod";
import { Building2, CircleDollarSign, ClipboardList, StickyNote } from "lucide-react";
import { FormProvider, useForm, useWatch } from "react-hook-form";

import type { FilterOption } from "@/app/customer/_lib/customer-asset-filter-options";
import {
  EMPTY_STOCK_FORM_OPTIONS,
  mapStockFormOptions,
  type StockFormOptions,
} from "@/app/customer/[tenant]/stock/_lib/stock-form-options";
import { transactionFieldLabels } from "@/components/form/common/field-labels";
import { formGridClass, formSpanFull } from "@/components/form/common/form-layout";
import { DateField } from "@/components/form/fields/date-field";
import { NumberField } from "@/components/form/fields/number-field";
import { ReferenceLinkField } from "@/components/form/fields/reference-link-field";
import { SelectField } from "@/components/form/fields/select-field";
import { TextAreaField } from "@/components/form/fields/text-area-field";
import { TextField } from "@/components/form/fields/text-field";
import {
  defaultCurrencyConversionFormValues,
  currencyConversionTransactionFormSchema,
  type CurrencyConversionFormValues,
} from "@/components/form/schemas/currency-conversion-transaction-schema";
import {
  formatMoney,
  parseAmount,
} from "@/components/form/transaction-workspace/transaction-form-summary";

import { TransactionFormSection } from "./form-section";

export type LoadCurrencyConversionFormOptionsClient = (aClass?: string) => Promise<{
  formOptions: StockFormOptions;
  defaults: Record<string, unknown> | null;
}>;

type CurrencyConversionTransactionFormProps = {
  formId: string;
  initialValues?: CurrencyConversionFormValues;
  onSubmit?: (values: CurrencyConversionFormValues) => void;
  loadFormOptions: LoadCurrencyConversionFormOptionsClient;
};

function toSelectOptions(options: FilterOption[]) {
  return options.map((option) => ({ value: option.value, label: option.label }));
}

function CurrencyConversionSummarySidebar() {
  const quantity = useWatch<CurrencyConversionFormValues, "quantity">({ name: "quantity" });
  const price = useWatch<CurrencyConversionFormValues, "price">({ name: "price" });
  const commission = useWatch<CurrencyConversionFormValues, "commission">({ name: "commission" });
  const b1 = useWatch<CurrencyConversionFormValues, "b_1">({ name: "b_1" });
  const b2 = useWatch<CurrencyConversionFormValues, "b_2">({ name: "b_2" });

  const gross = parseAmount(quantity) * parseAmount(price);
  const fees = parseAmount(commission) + parseAmount(b1) + parseAmount(b2);
  const net = gross - fees;

  return (
    <aside className="flex h-fit flex-col gap-4 rounded-xl border border-border/60 bg-muted/20 p-4 lg:sticky lg:top-4">
      <p className="font-medium text-sm">Live summary</p>
      <div className="space-y-2 text-sm">
        <div className="flex justify-between gap-3">
          <span className="text-muted-foreground">Gross Amount</span>
          <span className="font-mono">{formatMoney(gross)}</span>
        </div>
        <div className="flex justify-between gap-3">
          <span className="text-muted-foreground">Commission</span>
          <span className="font-mono">{formatMoney(parseAmount(commission))}</span>
        </div>
        <div className="flex justify-between gap-3">
          <span className="text-muted-foreground">Charges</span>
          <span className="font-mono">{formatMoney(parseAmount(b1))}</span>
        </div>
        <div className="flex justify-between gap-3">
          <span className="text-muted-foreground">Tax</span>
          <span className="font-mono">{formatMoney(parseAmount(b2))}</span>
        </div>
        <div className="flex justify-between gap-3 border-t border-border/50 pt-2 font-medium">
          <span>Net Amount</span>
          <span className="font-mono">{formatMoney(net)}</span>
        </div>
      </div>
    </aside>
  );
}

export function CurrencyConversionTransactionForm({
  formId,
  initialValues,
  onSubmit,
  loadFormOptions,
}: CurrencyConversionTransactionFormProps) {
  const [formOptions, setFormOptions] = React.useState<StockFormOptions>(EMPTY_STOCK_FORM_OPTIONS);
  const [optionsError, setOptionsError] = React.useState<string | null>(null);
  const [loadingOptions, setLoadingOptions] = React.useState(true);

  const form = useForm<CurrencyConversionFormValues>({
    resolver: zodResolver(currencyConversionTransactionFormSchema),
    defaultValues: { ...defaultCurrencyConversionFormValues, ...initialValues },
    mode: "onBlur",
  });

  React.useEffect(() => {
    form.reset({ ...defaultCurrencyConversionFormValues, ...initialValues });
  }, [form, initialValues]);

  React.useEffect(() => {
    let cancelled = false;
    setLoadingOptions(true);
    void loadFormOptions()
      .then(({ formOptions: options, defaults }) => {
        if (cancelled) return;
        setFormOptions(options);
        if (!initialValues) {
          const patch: Partial<CurrencyConversionFormValues> = {};
          if (defaults?.a_class != null) patch.a_class = String(defaults.a_class);
          if (defaults?.a_type != null) patch.a_type = String(defaults.a_type);
          if (Object.keys(patch).length > 0) {
            form.reset({ ...defaultCurrencyConversionFormValues, ...form.getValues(), ...patch });
          }
        }
      })
      .catch((error) => {
        if (!cancelled) {
          setOptionsError(error instanceof Error ? error.message : "Could not load form options.");
        }
      })
      .finally(() => {
        if (!cancelled) setLoadingOptions(false);
      });
    return () => {
      cancelled = true;
    };
  }, [form, initialValues, loadFormOptions]);

  const quantity = useWatch({ control: form.control, name: "quantity" });
  const price = useWatch({ control: form.control, name: "price" });
  React.useEffect(() => {
    const amount = Number(quantity || 0) * Number(price || 0);
    form.setValue("amount", Number.isFinite(amount) ? amount : 0, { shouldDirty: true });
  }, [form, quantity, price]);

  return (
    <FormProvider {...form}>
      <form
        id={formId}
        noValidate
        onSubmit={form.handleSubmit((values) => onSubmit?.(values))}
        className="w-full min-w-0"
      >
        {loadingOptions ? (
          <p className="mb-4 text-muted-foreground text-sm">Loading dropdown options…</p>
        ) : null}
        {optionsError ? <p className="mb-4 text-destructive text-sm">{optionsError}</p> : null}

        <div className="grid w-full min-w-0 grid-cols-1 gap-6 xl:grid-cols-[minmax(0,1fr)_18rem] xl:gap-8">
          <div className="flex min-w-0 flex-col gap-5 lg:gap-6">
            <TransactionFormSection
              title="Conversion details"
              description="Placement date, currencies, conversion rate, and amounts."
              icon={<ClipboardList className="size-4" />}
              contentClassName={formGridClass}
            >
              <DateField control={form.control} name="t_date" label="Placement Date" />
              <SelectField
                control={form.control}
                name="p_currency"
                label="Currency Bought"
                options={toSelectOptions(formOptions.currencies)}
                searchable
                searchPlaceholder="Search currency…"
              />
              <SelectField
                control={form.control}
                name="c_currency"
                label="Currency Sold"
                options={toSelectOptions(formOptions.currencies)}
                searchable
                searchPlaceholder="Search currency…"
              />
              <NumberField
                control={form.control}
                name="price"
                label="Amount (Base Currency)"
                step="0.0001"
              />
              <NumberField control={form.control} name="quantity" label="Conversion Rate" step="0.0001" />
              <NumberField
                control={form.control}
                name="amount"
                label="Amount (Currency Converted)"
                step="0.0001"
              />
              <TextField control={form.control} name="r_no" label={transactionFieldLabels.r_no} />
            </TransactionFormSection>

            <TransactionFormSection
              title="Fees"
              description="Commission, charges, and tax."
              icon={<CircleDollarSign className="size-4" />}
              contentClassName={formGridClass}
            >
              <NumberField control={form.control} name="commission" label="Commission" />
              <TextField control={form.control} name="b_1" label="Charges and fees abroad" />
              <TextField control={form.control} name="b_2" label="Federal turnover tax" />
            </TransactionFormSection>

            <TransactionFormSection
              title="Bank"
              description="Settlement bank."
              icon={<Building2 className="size-4" />}
              contentClassName={formGridClass}
            >
              <div className="hidden">
                <SelectField
                  control={form.control}
                  name="a_class"
                  label={transactionFieldLabels.a_class}
                  options={toSelectOptions(formOptions.assetClasses)}
                />
                <SelectField
                  control={form.control}
                  name="a_type"
                  label={transactionFieldLabels.a_type}
                  options={toSelectOptions(formOptions.assetTypes)}
                />
              </div>
              <SelectField
                control={form.control}
                name="bank"
                label={transactionFieldLabels.bank}
                options={toSelectOptions(formOptions.banks)}
                searchable
                searchPlaceholder="Search bank…"
              />
              <ReferenceLinkField control={form.control} name="r_link" />
            </TransactionFormSection>

            <TransactionFormSection
              title="Notes"
              description="Remarks and purpose."
              icon={<StickyNote className="size-4" />}
              contentClassName={formGridClass}
            >
              <TextAreaField
                control={form.control}
                name="remarks"
                label={transactionFieldLabels.remarks}
                className={formSpanFull}
              />
              <TextAreaField
                control={form.control}
                name="purpose"
                label={transactionFieldLabels.purpose}
                className={formSpanFull}
              />
            </TransactionFormSection>
          </div>

          <CurrencyConversionSummarySidebar />
        </div>
      </form>
    </FormProvider>
  );
}

export { mapStockFormOptions as mapCurrencyConversionFormOptions };