"use client";
import { LocationIcon } from "@/assets/icons";
import Breadcrumb from "@/components/Breadcrumbs/Breadcrumb";
import { ShowcaseSection } from "@/components/Layouts/showcase-section";
import Loading from "@/components/loading";
import Status from "@/components/ui/Status";
import { useTenderDetailQuery } from "@/hooks/queries";
import { useGetFlagQuery } from "@/hooks/queries/useFlagsQueries";
import { cn } from "@/lib/utils";
import {
  isValidAlpha2CountryCode,
  truncateString,
  unixToDate,
} from "@/utils/shared";
import getSymbolFromCurrency from "currency-symbol-map";
import Link from "next/link";
import { use } from "react";

interface IProps {
  params: Promise<{
    details: string;
  }>;
}

const isValidDisplayCountryCode = (code: string) => /^[A-Za-z]{2,3}$/.test(code);

function SectionHeading({ children }: { children: React.ReactNode }) {
  return (
    <div className="mb-4 flex items-center gap-3">
      <span className="h-px flex-1 bg-gradient-to-r from-stroke/0 via-stroke/80 to-stroke/0 dark:from-dark-3/0 dark:via-dark-3 dark:to-dark-3/0" />
      <h2 className="shrink-0 text-[11px] font-semibold uppercase tracking-[0.2em] text-dark-5 dark:text-dark-6">
        {children}
      </h2>
      <span className="h-px flex-1 bg-gradient-to-l from-stroke/0 via-stroke/80 to-stroke/0 dark:from-dark-3/0 dark:via-dark-3 dark:to-dark-3/0" />
    </div>
  );
}

function ExternalLinkIcon({ className }: { className?: string }) {
  return (
    <svg
      className={cn("h-4 w-4 shrink-0", className)}
      fill="none"
      viewBox="0 0 24 24"
      stroke="currentColor"
      strokeWidth={2}
      aria-hidden
    >
      <path
        strokeLinecap="round"
        strokeLinejoin="round"
        d="M10 6H6a2 2 0 00-2 2v10a2 2 0 002 2h10a2 2 0 002-2v-4M14 4h6m0 0v6m0-6L10 14"
      />
    </svg>
  );
}

/** Body area only: center content in the card; ShowcaseSection `title` is unchanged */
const SHOWCASE_CENTERED_BODY = {
  rootClassName: "flex h-full min-h-0 flex-col",
  className:
    "flex min-h-0 flex-1 flex-col items-center justify-center text-center",
} as const;

const TenderDetails = ({ params }: IProps) => {
  const { details } = use(params);
  const { data, isLoading, isError } = useTenderDetailQuery(details);
  const countryCodeNormalized =
    data?.data.country_code?.trim().toUpperCase() ?? "";
  const hasValidCountryCodeForDisplay =
    isValidDisplayCountryCode(countryCodeNormalized);
  const canLoadCountryFlag = isValidAlpha2CountryCode(countryCodeNormalized);
  const { data: flagData } = useGetFlagQuery(countryCodeNormalized, {
    enabled: canLoadCountryFlag,
  });
  const breadcrumbItems = [
    { name: "Dashboard", href: "/" },
    { name: "Tenders", href: "/tenders" },
    { name: "Tender details", href: `/tenders/${details}` },
  ];

  if (isLoading) return <Loading />;
  if (isError) {
    return (
      <>
        <Breadcrumb items={breadcrumbItems} />
        <ShowcaseSection className="!p-8 sm:!p-10">
          <div className="flex flex-col items-center justify-center gap-3 py-12 text-center">
            <p className="text-lg font-semibold text-dark dark:text-white">
              We couldn&apos;t load this tender
            </p>
            <p className="max-w-sm text-sm text-dark-5 dark:text-dark-6">
              Check your connection or try again. You can go back to the tender
              list anytime.
            </p>
            <Link
              href="/tenders"
              className="shadow-theme-xs mt-2 inline-flex items-center justify-center rounded-xl bg-primary px-5 py-2.5 text-sm font-medium text-white transition hover:bg-primary/90"
            >
              Back to tenders
            </Link>
          </div>
        </ShowcaseSection>
      </>
    );
  }

  const tender = data!.data;
  const submissionUrl = tender.submission_url?.trim();
  const currencyCode = tender.currency?.trim().toUpperCase() ?? "";
  const hasValidCurrency = Boolean(currencyCode);
  const hasValidEstimatedValue =
    typeof tender.estimated_value === "number" &&
    Number.isFinite(tender.estimated_value) &&
    tender.estimated_value > 0;
  const hasValidLocationCurrencyOrValue =
    hasValidCountryCodeForDisplay || hasValidCurrency || hasValidEstimatedValue;

  return (
    <>
      <Breadcrumb items={breadcrumbItems} />
      <ShowcaseSection
        title={
          <div className="flex flex-col gap-5 lg:flex-row lg:items-start lg:justify-between">
            <div className="min-w-0 space-y-2">
              <p className="text-[11px] font-semibold uppercase tracking-[0.18em] text-primary">
                Tender
              </p>
              <h1 className="text-balance text-xl font-bold leading-tight text-dark dark:text-white sm:text-2xl lg:text-[1.65rem]">
                {tender.title}
              </h1>
            </div>
            <div className="flex shrink-0 flex-col gap-3 sm:flex-row sm:items-center sm:justify-end">
              <Status status={tender.status ?? "Unknown"}>
                {tender.status}
              </Status>
              {submissionUrl && (
                <Link
                  href={submissionUrl}
                  target="_blank"
                  rel="noopener noreferrer"
                  className="shadow-theme-xs inline-flex items-center justify-center gap-2 rounded-xl bg-primary px-4 py-2.5 text-sm font-medium text-white transition hover:bg-primary/90 hover:shadow-md"
                >
                  <span>Open submission</span>
                  <ExternalLinkIcon className="opacity-90" />
                </Link>
              )}
            </div>
          </div>
        }
        className="!p-0"
      >
        <div className="space-y-10 px-4 pb-8 pt-2 sm:px-6 sm:pb-10 xl:px-10">
          <div>
            <SectionHeading>Procurement</SectionHeading>
            <div className="grid gap-4 sm:grid-cols-2 xl:grid-cols-3 2xl:grid-cols-5">
              <ShowcaseSection title="Tender ID" {...SHOWCASE_CENTERED_BODY}>
                <span className="font-medium text-dark dark:text-white">
                  {tender.tender_id}
                </span>
              </ShowcaseSection>
              <ShowcaseSection
                title="Buyer organization"
                rootClassName={SHOWCASE_CENTERED_BODY.rootClassName}
                className={cn(
                  "sm:col-span-2 xl:col-span-1 2xl:col-span-2",
                  SHOWCASE_CENTERED_BODY.className,
                )}
              >
                <span className="font-medium text-dark dark:text-white">
                  {tender.buyer_organization.name}
                </span>
              </ShowcaseSection>
              <ShowcaseSection
                title="Notice publication ID"
                {...SHOWCASE_CENTERED_BODY}
              >
                <span className="font-medium text-dark dark:text-white">
                  {tender.notice_publication_id}
                </span>
              </ShowcaseSection>
              <ShowcaseSection
                title="Procedure code"
                {...SHOWCASE_CENTERED_BODY}
              >
                <span className="font-medium text-dark dark:text-white">
                  {tender.procedure_code}
                </span>
              </ShowcaseSection>
              <ShowcaseSection
                title="Procurement type"
                {...SHOWCASE_CENTERED_BODY}
              >
                <span className="font-medium text-dark dark:text-white">
                  {tender.procurement_type_code}
                </span>
              </ShowcaseSection>
            </div>
          </div>

          <div>
            <SectionHeading>Timeline</SectionHeading>
            <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-5">
              <ShowcaseSection
                title="Application deadline"
                {...SHOWCASE_CENTERED_BODY}
              >
                <time className="font-medium tabular-nums text-dark dark:text-white">
                  {unixToDate({
                    unix: tender.application_deadline ?? 0,
                    hasTime: true,
                  })}
                </time>
              </ShowcaseSection>
              <ShowcaseSection
                title="Publication date"
                {...SHOWCASE_CENTERED_BODY}
              >
                <time className="font-medium tabular-nums text-dark dark:text-white">
                  {unixToDate({
                    unix: tender.publication_date ?? 0,
                    hasTime: true,
                  })}
                </time>
              </ShowcaseSection>
              <ShowcaseSection
                title="Submission deadline"
                {...SHOWCASE_CENTERED_BODY}
              >
                <time className="font-medium tabular-nums text-dark dark:text-white">
                  {unixToDate({
                    unix: tender.submission_deadline ?? 0,
                    hasTime: true,
                  })}
                </time>
              </ShowcaseSection>
              <ShowcaseSection
                title="Tender deadline"
                {...SHOWCASE_CENTERED_BODY}
              >
                <time className="font-medium tabular-nums text-dark dark:text-white">
                  {unixToDate({
                    unix: tender.tender_deadline ?? 0,
                    hasTime: true,
                  })}
                </time>
              </ShowcaseSection>
              {submissionUrl && (
                <ShowcaseSection
                  title="Submission URL"
                  {...SHOWCASE_CENTERED_BODY}
                >
                  <Link
                    href={submissionUrl}
                    target="_blank"
                    rel="noopener noreferrer"
                    className="inline-flex max-w-full items-center gap-1.5 break-all font-medium text-primary underline-offset-4 hover:underline"
                  >
                    <ExternalLinkIcon className="shrink-0" />
                    {truncateString(submissionUrl, 42)}
                  </Link>
                </ShowcaseSection>
              )}
            </div>
          </div>

          {hasValidLocationCurrencyOrValue && (
            <div>
              <SectionHeading>Location & currency</SectionHeading>
              <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3 lg:max-w-5xl">
                {hasValidCountryCodeForDisplay && (
                  <div className="shadow-theme-xs relative overflow-hidden rounded-2xl border border-stroke/70 bg-gradient-to-br from-white via-gray-2/30 to-primary/[0.06] p-5 dark:border-dark-3 dark:from-gray-dark dark:via-gray-dark dark:to-primary/[0.12]">
                    <div className="pointer-events-none absolute -right-8 top-0 h-24 w-24 rounded-full bg-primary/15 blur-2xl dark:bg-primary/25" />
                    <h3 className="mb-4 text-xs font-semibold uppercase tracking-wide text-dark-5 dark:text-dark-6">
                      Country
                    </h3>
                    <div className="flex items-center gap-3">
                      <span className="flex h-11 w-11 items-center justify-center rounded-xl bg-white/80 text-primary shadow-inner dark:bg-dark-2/80">
                        <LocationIcon />
                      </span>
                      <div className="flex flex-wrap items-center gap-2">
                        <span className="text-sm font-semibold uppercase tracking-wide text-dark dark:text-white">
                          {countryCodeNormalized}
                        </span>
                        {flagData && (
                          <div
                            dangerouslySetInnerHTML={{ __html: flagData }}
                            className="flex h-8 w-11 items-center justify-center overflow-hidden rounded-lg border border-stroke/60 shadow-sm dark:border-dark-3"
                          />
                        )}
                      </div>
                    </div>
                  </div>
                )}

                {hasValidCurrency && (
                  <div className="shadow-theme-xs relative overflow-hidden rounded-2xl border border-stroke/70 bg-gradient-to-br from-white via-gray-2/30 to-blue/[0.06] p-5 dark:border-dark-3 dark:from-gray-dark dark:via-gray-dark dark:to-blue/[0.12]">
                    <div className="pointer-events-none absolute -left-6 bottom-0 h-20 w-20 rounded-full bg-blue/15 blur-2xl dark:bg-blue/25" />
                    <h3 className="mb-4 text-xs font-semibold uppercase tracking-wide text-dark-5 dark:text-dark-6">
                      Currency
                    </h3>
                    <div className="flex items-baseline gap-2">
                      <span className="text-2xl font-bold tabular-nums text-dark dark:text-white">
                        {currencyCode}
                      </span>
                      <span className="text-lg font-medium text-dark-5 dark:text-dark-6">
                        {getSymbolFromCurrency(currencyCode || "USD")}
                      </span>
                    </div>
                  </div>
                )}

                {hasValidEstimatedValue && (
                  <div className="shadow-theme-xs relative overflow-hidden rounded-2xl border border-stroke/70 bg-gradient-to-br from-white via-gray-2/30 to-green/[0.06] p-5 dark:border-dark-3 dark:from-gray-dark dark:via-gray-dark dark:to-green/[0.12]">
                    <div className="pointer-events-none absolute -right-6 bottom-0 h-20 w-20 rounded-full bg-green/15 blur-2xl dark:bg-green/25" />
                    <h3 className="mb-4 text-xs font-semibold uppercase tracking-wide text-dark-5 dark:text-dark-6">
                      Estimated value
                    </h3>
                    <div className="flex items-baseline gap-2">
                      <span className="text-2xl font-bold tabular-nums text-dark dark:text-white">
                        {new Intl.NumberFormat().format(tender.estimated_value)}
                      </span>
                      {hasValidCurrency && (
                        <span className="text-sm font-medium uppercase text-dark-5 dark:text-dark-6">
                          {currencyCode}
                        </span>
                      )}
                    </div>
                  </div>
                )}
              </div>
            </div>
          )}

          <div>
            <SectionHeading>Description</SectionHeading>
            <div className="rounded-2xl border border-stroke/60 bg-gray-2/40 p-6 shadow-inner dark:border-dark-3 dark:bg-dark-3/30">
              <p className="whitespace-pre-wrap text-sm leading-relaxed text-dark dark:text-white/90">
                {tender.description || "—"}
              </p>
            </div>
          </div>
        </div>
      </ShowcaseSection>
    </>
  );
};

export default TenderDetails;