import type { Metadata } from "next";
import { notFound } from "next/navigation";
import { headers } from "next/headers";
import Link from "next/link";
import { Printer, UtensilsCrossed, StickyNote, ExternalLink } from "lucide-react";
import { auth } from "@/lib/auth/server";
import { db, collections, eq, and } from "@epicure/db";
import { collectionVisibleToViewer } from "@/lib/visibility";
import { RecipeGridCard } from "@/components/recipe/recipe-grid-card";
import { CollectionRecipesGrid } from "@/components/collections/collection-recipes-grid";
import { ForkCollectionButton } from "@/components/collections/fork-collection-button";
import { ShareCollectionButton } from "@/components/collections/share-collection-button";
import { GenerateMealDialog } from "@/components/collections/generate-meal-dialog";
import { EditCollectionDialog } from "@/components/collections/edit-collection-dialog";
import { DeleteCollectionDialog } from "@/components/collections/delete-collection-dialog";
import { Badge } from "@/components/ui/badge";
import { buttonVariants } from "@/components/ui/button";
import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "@/components/ui/tooltip";
import { cn } from "@/lib/utils";
import { ExportMarkdownButton } from "@/components/shared/export-markdown-button";
import { getFeatureFlagMatrix, type Tier } from "@/lib/feature-flags";
import { EmptyState } from "@/components/shared/empty-state";
import { collectionToMarkdown } from "@/lib/markdown/collection";
import { getMessages } from "@/lib/i18n/server";

type Params = { params: Promise<{ id: string }> };

export const metadata: Metadata = {};

export default async function CollectionPage({ params }: Params) {
  const { id } = await params;
  const session = await auth.api.getSession({ headers: await headers() });
  if (!session) return null;
  const m = getMessages((session.user as { locale?: string }).locale);
  const viewerTier = (session.user as { tier?: string }).tier as Tier | undefined ?? "free";
  const canExportMarkdown = (await getFeatureFlagMatrix()).markdown_export[viewerTier];

  const col = await db.query.collections.findFirst({
    where: and(eq(collections.id, id), collectionVisibleToViewer(session.user.id)),
    with: {
      recipes: {
        orderBy: (t, { asc }) => asc(t.position),
        with: { recipe: { with: { photos: true } } },
      },
    },
  });

  if (!col) notFound();

  const isOwner = col.userId === session.user.id;
  const recipeList = col.recipes.flatMap((r) => (r.recipe ? [r.recipe] : []));

  return (
    <div className="space-y-6">
      <div className="flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
        <div>
          <h1 className="text-3xl font-bold tracking-tight">{col.name}</h1>
          {col.description && <p className="text-muted-foreground mt-1">{col.description}</p>}
          {col.tags.length > 0 && (
            <div className="flex flex-wrap gap-1.5 mt-2">
              {col.tags.map((tag) => (
                <Badge key={tag} variant="outline" className="text-xs">{tag}</Badge>
              ))}
            </div>
          )}
          <p className="text-sm text-muted-foreground mt-1">
            {recipeList.length} recipe{recipeList.length !== 1 ? "s" : ""} · {m.recipe.visibility[col.visibility]}
          </p>
          {isOwner && col.notes && (
            <div className="mt-2 flex items-start gap-2 rounded-lg border bg-muted/30 px-3 py-2 text-sm text-muted-foreground max-w-2xl">
              <StickyNote className="h-4 w-4 shrink-0 mt-0.5" />
              <p className="whitespace-pre-wrap">{col.notes}</p>
            </div>
          )}
        </div>
        <TooltipProvider>
          <div className="flex flex-wrap items-center gap-1">
            {recipeList.length > 0 && (
              <>
                <Tooltip>
                  <TooltipTrigger render={
                    <Link href={`/print/collection/${id}`} target="_blank" className={cn(buttonVariants({ variant: "ghost", size: "icon" }))}>
                      <Printer className="h-4 w-4" />
                    </Link>
                  } />
                  <TooltipContent>{m.collections.exportPdf}</TooltipContent>
                </Tooltip>
                {canExportMarkdown && <ExportMarkdownButton
                  markdown={collectionToMarkdown({
                    name: col.name,
                    description: col.description,
                    recipes: recipeList,
                  })}
                  filename={col.name}
                />}
              </>
            )}
            {isOwner && <GenerateMealDialog collectionId={id} />}
            {isOwner && <ShareCollectionButton collectionId={id} />}
            {isOwner && (
              <EditCollectionDialog
                collectionId={id}
                initialName={col.name}
                initialDescription={col.description}
                initialNotes={col.notes}
                initialTags={col.tags}
                initialVisibility={col.visibility}
              />
            )}
            {isOwner && <DeleteCollectionDialog collectionId={id} />}
            {col.visibility === "public" && (
              <Tooltip>
                <TooltipTrigger render={
                  <Link href={`/c/${id}`} target="_blank" className={cn(buttonVariants({ variant: "ghost", size: "icon" }))}>
                    <ExternalLink className="h-4 w-4" />
                  </Link>
                } />
                <TooltipContent>{m.recipe.viewPublicly}</TooltipContent>
              </Tooltip>
            )}
            {!isOwner && (col.visibility === "public" || col.visibility === "unlisted") && (
              <ForkCollectionButton collectionId={id} />
            )}
          </div>
        </TooltipProvider>
      </div>

      {recipeList.length === 0 ? (
        <EmptyState icon={UtensilsCrossed} title={m.collections.emptyCollection} compact />
      ) : isOwner ? (
        <CollectionRecipesGrid collectionId={id} recipes={recipeList} />
      ) : (
        <div className="grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-4">
          {recipeList.map((recipe) => (
            <Link key={recipe.id} href={`/recipes/${recipe.id}`}>
              <RecipeGridCard recipe={recipe} />
            </Link>
          ))}
        </div>
      )}
    </div>
  );
}
