import config from "@payload-config";
import Link from "next/link";
import { redirect } from "next/navigation";
import { headers as nextHeaders } from "next/headers";
import { getPayload } from "payload";
import { ArrowLeftIcon, PencilIcon } from "lucide-react";
import { Card, CardContent } from "@/components/ui/card";
import { LockdownBanner } from "@/components/frontend/wiki/LockdownBanner";
import { WikiEditor } from "@/components/frontend/wiki/WikiEditor";
import { listTemplates, templateMap } from "@/lib/wiki/service";
import hasRoles from "@/utils/access-control/hasRoles";

export const metadata = {
  title: "Edit wiki page: Polaris Task Force",
};

function templateCssMap(
  templates: readonly { name: string; css?: string | null }[],
): Record<string, string> {
  const map: Record<string, string> = {};
  for (const template of templates) {
    if (template.css && template.css.trim().length > 0) map[template.name] = template.css;
  }
  return map;
}

function templateHtmlMap(
  templates: readonly { name: string; html?: string | null }[],
): Record<string, string> {
  const map: Record<string, string> = {};
  for (const template of templates) {
    if (template.html && template.html.trim().length > 0) map[template.name] = template.html;
  }
  return map;
}

export default async function EditWikiPage({
  params,
}: {
  readonly params: Promise<{ slug: string }>;
}) {
  const { slug } = await params;
  const payload = await getPayload({ config });
  const headers = await nextHeaders();
  const { user } = await payload.auth({ headers, canSetHeaders: false });
  const pageResult = await payload.find({
    collection: "wiki-pages",
    where: { slug: { equals: slug } },
    limit: 1,
    depth: 1,
    overrideAccess: true,
  });
  const page = pageResult.docs[0];

  if (!page) {
    redirect(`/wiki/new?title=${encodeURIComponent(slug)}`);
  }

  if (page.lockdown) {
    return (
      <div className="flex flex-col gap-6 p-5">
        <Link
          href={`/wiki/${page.slug}`}
          className="flex w-fit items-center gap-1 text-sm text-muted-foreground transition-colors hover:text-primary"
        >
          <ArrowLeftIcon className="size-3" />
          Back to page
        </Link>
        <div className="flex items-center gap-2">
          <PencilIcon className="size-5 text-muted-foreground" />
          <h1 className="text-lg font-semibold">Edit {page.title}</h1>
        </div>
        <LockdownBanner />
      </div>
    );
  }

  const canEditDocumentation = hasRoles(["admin"], user);
  if (page.category === "Documentation" && !canEditDocumentation) {
    return (
      <div className="flex flex-col gap-6 p-5">
        <Link
          href={`/wiki/${page.slug}`}
          className="flex w-fit items-center gap-1 text-sm text-muted-foreground transition-colors hover:text-primary"
        >
          <ArrowLeftIcon className="size-3" />
          Back to page
        </Link>
        <div className="flex items-center gap-2">
          <PencilIcon className="size-5 text-muted-foreground" />
          <h1 className="text-lg font-semibold">Edit {page.title}</h1>
        </div>
        <Card>
          <CardContent className="p-6 text-sm text-muted-foreground">
            Documentation pages are maintained by admins and developers. If something here is out
            of date, contact the staff team.
          </CardContent>
        </Card>
      </div>
    );
  }

  const [templates, pagesResult, hasEditedRevisions] = await Promise.all([
    listTemplates(payload),
    payload.find({
      collection: "wiki-pages",
      sort: "title",
      limit: 200,
      depth: 0,
      overrideAccess: true,
    }),
    user
      ? payload
          .find({
            collection: "wiki-revisions",
            where: { editor: { equals: user.id } },
            limit: 1,
            depth: 0,
            overrideAccess: true,
          })
          .then((result) => result.docs.length > 0)
      : Promise.resolve(true),
  ]);
  const existingPages = pagesResult.docs.map((existingPage) => ({ title: existingPage.title }));

  return (
    <div className="flex flex-col gap-6 p-5">
      <div className="flex flex-col gap-3">
        <Link
          href={`/wiki/${page.slug}`}
          className="flex w-fit items-center gap-1 text-sm text-muted-foreground transition-colors hover:text-primary"
        >
          <ArrowLeftIcon className="size-3" />
          Back to page
        </Link>
        <div className="flex items-center gap-2">
          <PencilIcon className="size-5 text-muted-foreground" />
          <h1 className="text-lg font-semibold">Edit {page.title}</h1>
        </div>
        <p className="text-sm text-muted-foreground">
          Update the article and leave a short note for the revision history.
        </p>
      </div>

      <Card>
        <CardContent className="p-6">
          <WikiEditor
            mode="edit"
            initial={{
              id: page.id,
              title: page.title,
              category: page.category,
              tags: page.tags ?? [],
              body: page.body,
            }}
            templates={templateMap(templates)}
            templateCssMap={templateCssMap(templates)}
            templateHtmlMap={templateHtmlMap(templates)}
            existingPages={existingPages}
            isFirstEdit={!hasEditedRevisions}
            canEditDocumentation={canEditDocumentation}
          />
        </CardContent>
      </Card>
    </div>
  );
}