"use client";
import { useCheckout } from "@/features/checkout/hooks/useCheckout";
import { PageLayout } from "@/components/templates/PageLayout";
import { SubCard } from "@/components/molecules/SubCard/SubCard";
import { Button } from "@/components/atoms/button";
import { AlertBanner } from "@/components/molecules/AlertBanner/AlertBanner";
import { PageAsync } from "@/components/molecules/AsyncBlock/AsyncBlock";
import { InlineToast } from "@/components/atoms/inline-toast";
import { StatusPill } from "@/components/atoms/status-pill";
import { AddressConfirmation } from "@/features/catalog/components/base/AddressConfirmation";
import { isLoading, isError, isSuccess } from "@customer-portal/domain/toolkit";
import { ShieldCheckIcon, CreditCardIcon } from "@heroicons/react/24/outline";
import type { PaymentMethod } from "@customer-portal/domain/payments";

export function CheckoutContainer() {
  const {
    checkoutState,
    submitting,
    orderType,
    addressConfirmed,
    paymentMethods,
    paymentMethodsLoading,
    paymentMethodsError,
    paymentRefresh,
    confirmAddress,
    markAddressIncomplete,
    handleSubmitOrder,
    navigateBackToConfigure,
    activeInternetWarning,
  } = useCheckout();

  if (isLoading(checkoutState)) {
    return (
      <PageLayout
        title="Submit Order"
        description="Loading order details"
        icon={<ShieldCheckIcon className="h-6 w-6" />}
      >
        <PageAsync isLoading loadingText="Loading order submission...">
          <></>
        </PageAsync>
      </PageLayout>
    );
  }

  if (isError(checkoutState)) {
    return (
      <PageLayout
        title="Submit Order"
        description="Error loading order submission"
        icon={<ShieldCheckIcon className="h-6 w-6" />}
      >
        <div className="py-6">
          <AlertBanner variant="error" title="Unable to load checkout" elevated>
            <div className="flex items-center justify-between">
              <span>{checkoutState.error.message}</span>
              <Button variant="link" onClick={navigateBackToConfigure}>
                Go Back
              </Button>
            </div>
          </AlertBanner>
        </div>
      </PageLayout>
    );
  }

  if (!isSuccess(checkoutState)) {
    return (
      <PageLayout
        title="Submit Order"
        description="Checkout data not available"
        icon={<ShieldCheckIcon className="h-6 w-6" />}
      >
        <div className="py-6">
          <AlertBanner variant="error" title="Checkout Error" elevated>
            <div className="flex items-center justify-between">
              <span>Checkout data is not available</span>
              <Button variant="link" onClick={navigateBackToConfigure}>
                Go Back
              </Button>
            </div>
          </AlertBanner>
        </div>
      </PageLayout>
    );
  }

  const { items, totals } = checkoutState.data;
  const paymentMethodList = paymentMethods?.paymentMethods ?? [];
  const defaultPaymentMethod =
    paymentMethodList.find(method => method.isDefault) ?? paymentMethodList[0] ?? null;
  const paymentMethodDisplay = defaultPaymentMethod
    ? buildPaymentMethodDisplay(defaultPaymentMethod)
    : null;

  return (
    <PageLayout
      title="Checkout"
      description="Verify your address, review totals, and submit your order"
      icon={<ShieldCheckIcon className="h-6 w-6" />}
    >
      <div className="max-w-2xl mx-auto space-y-8">
        <InlineToast
          visible={paymentRefresh.toast.visible}
          text={paymentRefresh.toast.text}
          tone={paymentRefresh.toast.tone}
        />

        {activeInternetWarning && (
          <AlertBanner variant="warning" title="Existing Internet Subscription" elevated>
            <span className="text-sm text-foreground/80">{activeInternetWarning}</span>
          </AlertBanner>
        )}

        <div className="bg-card border border-border rounded-2xl p-6 md:p-7 shadow-[var(--cp-shadow-1)]">
          <div className="flex items-center gap-3 mb-6">
            <ShieldCheckIcon className="w-6 h-6 text-primary" />
            <h2 className="text-lg font-semibold text-foreground">Confirm Details</h2>
          </div>
          <div className="space-y-5">
            <SubCard>
              <AddressConfirmation
                embedded
                onAddressConfirmed={confirmAddress}
                onAddressIncomplete={markAddressIncomplete}
                orderType={orderType}
              />
            </SubCard>

            <SubCard
              title="Billing & Payment"
              icon={<CreditCardIcon className="w-5 h-5 text-primary" />}
              right={
                paymentMethods && paymentMethods.paymentMethods.length > 0 ? (
                  <StatusPill label="Verified" variant="success" />
                ) : undefined
              }
            >
              {paymentMethodsLoading ? (
                <div className="text-sm text-muted-foreground">Checking payment methods...</div>
              ) : paymentMethodsError ? (
                <AlertBanner
                  variant="warning"
                  title="Unable to verify payment methods"
                  size="sm"
                  elevated
                >
                  <div className="flex items-center gap-2">
                    <Button
                      type="button"
                      size="sm"
                      onClick={() => void paymentRefresh.triggerRefresh()}
                    >
                      Check Again
                    </Button>
                    <Button as="a" href="/billing/payments" size="sm">
                      Add Payment Method
                    </Button>
                  </div>
                </AlertBanner>
              ) : paymentMethodList.length > 0 ? (
                <div className="space-y-3">
                  {paymentMethodDisplay ? (
                    <div className="rounded-xl border border-border bg-card p-4 shadow-[var(--cp-shadow-1)] transition-shadow duration-200 hover:shadow-[var(--cp-shadow-2)]">
                      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
                        <div>
                          <p className="text-xs font-semibold uppercase tracking-wide text-primary">
                            Default payment method
                          </p>
                          <p className="mt-1 text-sm font-semibold text-foreground">
                            {paymentMethodDisplay.title}
                          </p>
                          {paymentMethodDisplay.subtitle ? (
                            <p className="mt-1 text-xs text-muted-foreground">
                              {paymentMethodDisplay.subtitle}
                            </p>
                          ) : null}
                        </div>
                        <Button
                          as="a"
                          href="/billing/payments"
                          variant="link"
                          size="sm"
                          className="self-start whitespace-nowrap"
                        >
                          Manage billing & payments
                        </Button>
                      </div>
                    </div>
                  ) : null}
                  <p className="text-xs text-muted-foreground">
                    We securely charge your saved payment method after the order is approved. Need
                    to make changes? Visit Billing & Payments.
                  </p>
                </div>
              ) : (
                <AlertBanner variant="error" title="No payment method on file" size="sm" elevated>
                  <div className="flex items-center gap-2">
                    <Button
                      type="button"
                      size="sm"
                      onClick={() => void paymentRefresh.triggerRefresh()}
                    >
                      Check Again
                    </Button>
                    <Button as="a" href="/billing/payments" size="sm">
                      Add Payment Method
                    </Button>
                  </div>
                </AlertBanner>
              )}
            </SubCard>
          </div>
        </div>

        <div className="bg-muted border border-border rounded-2xl p-6 md:p-7 text-center shadow-[var(--cp-shadow-1)]">
          <div className="w-16 h-16 bg-card rounded-full flex items-center justify-center mx-auto mb-4 shadow-[var(--cp-shadow-1)] border border-border">
            <ShieldCheckIcon className="w-8 h-8 text-primary" />
          </div>
          <h2 className="text-2xl font-bold text-foreground mb-2">Review & Submit</h2>
          <p className="text-muted-foreground mb-4 max-w-xl mx-auto">
            You’re almost done. Confirm your details above, then submit your order. We’ll review and
            notify you when everything is ready.
          </p>
          <div className="bg-card rounded-lg p-4 border border-border text-left max-w-2xl mx-auto shadow-[var(--cp-shadow-1)]">
            <h3 className="font-semibold text-foreground mb-2">What to expect</h3>
            <div className="text-sm text-muted-foreground space-y-1">
              <p>• Our team reviews your order and schedules setup if needed</p>
              <p>• We may contact you to confirm details or availability</p>
              <p>• We only charge your card after the order is approved</p>
              <p>• You’ll receive confirmation and next steps by email</p>
            </div>
          </div>

          <div className="mt-4 bg-card rounded-lg p-4 border border-border max-w-2xl mx-auto shadow-[var(--cp-shadow-1)]">
            <div className="flex justify-between items-center">
              <span className="font-medium text-muted-foreground">Estimated Total</span>
              <div className="text-right">
                <div className="text-xl font-bold text-foreground">
                  ¥{totals.monthlyTotal.toLocaleString()}/mo
                </div>
                {totals.oneTimeTotal > 0 && (
                  <div className="text-sm text-warning font-medium">
                    + ¥{totals.oneTimeTotal.toLocaleString()} one-time
                  </div>
                )}
              </div>
            </div>
          </div>
        </div>

        <div className="flex gap-4">
          <Button
            type="button"
            variant="outline"
            className="flex-1 py-4"
            onClick={navigateBackToConfigure}
          >
            ← Back to Configuration
          </Button>
          <Button
            type="button"
            className="flex-1 py-4 text-lg"
            onClick={() => {
              void handleSubmitOrder();
            }}
            disabled={
              submitting ||
              items.length === 0 ||
              !addressConfirmed ||
              paymentMethodsLoading ||
              !paymentMethods ||
              paymentMethods.paymentMethods.length === 0
            }
            isLoading={submitting}
            loadingText="Submitting…"
          >
            {!addressConfirmed
              ? "Confirm Installation Address"
              : paymentMethodsLoading
                ? "Verifying Payment Method…"
                : !paymentMethods || paymentMethods.paymentMethods.length === 0
                  ? "Add Payment Method to Continue"
                  : "Submit Order"}
          </Button>
        </div>
      </div>
    </PageLayout>
  );
}

function buildPaymentMethodDisplay(method: PaymentMethod): { title: string; subtitle?: string } {
  const descriptor =
    method.cardType?.trim() ||
    method.bankName?.trim() ||
    method.description?.trim() ||
    method.gatewayName?.trim() ||
    "Saved payment method";

  const trimmedLastFour =
    typeof method.cardLastFour === "string" && method.cardLastFour.trim().length > 0
      ? method.cardLastFour.trim().slice(-4)
      : null;

  const headline =
    trimmedLastFour && method.type?.toLowerCase().includes("card")
      ? `${descriptor} · •••• ${trimmedLastFour}`
      : descriptor;

  const details = new Set<string>();

  if (method.bankName && !headline.toLowerCase().includes(method.bankName.trim().toLowerCase())) {
    details.add(method.bankName.trim());
  }

  const expiry = normalizeExpiryLabel(method.expiryDate);
  if (expiry) {
    details.add(`Exp ${expiry}`);
  }

  if (!trimmedLastFour && method.cardLastFour && method.cardLastFour.trim().length > 0) {
    details.add(`Ends ${method.cardLastFour.trim().slice(-4)}`);
  }

  if (method.type?.toLowerCase().includes("bank") && method.description?.trim()) {
    details.add(method.description.trim());
  }

  const subtitle = details.size > 0 ? Array.from(details).join(" · ") : undefined;
  return { title: headline, subtitle };
}

function normalizeExpiryLabel(expiry?: string | null): string | null {
  if (!expiry) return null;
  const value = expiry.trim();
  if (!value) return null;

  if (/^\d{4}-\d{2}$/.test(value)) {
    const [year, month] = value.split("-");
    return `${month}/${year.slice(-2)}`;
  }

  if (/^\d{2}\/\d{4}$/.test(value)) {
    const [month, year] = value.split("/");
    return `${month}/${year.slice(-2)}`;
  }

  if (/^\d{2}\/\d{2}$/.test(value)) {
    return value;
  }

  const digits = value.replace(/\D/g, "");

  if (digits.length === 6) {
    const year = digits.slice(2, 4);
    const month = digits.slice(4, 6);
    return `${month}/${year}`;
  }

  if (digits.length === 4) {
    const month = digits.slice(0, 2);
    const year = digits.slice(2, 4);
    return `${month}/${year}`;
  }

  return value;
}

export default CheckoutContainer;