import type { Metadata } from "next";
import { notFound } from "next/navigation";
import { headers } from "next/headers";
import Link from "next/link";
import { Clock, Users, Globe, Lock, Link2, Pencil, ChefHat, ExternalLink, Play } from "lucide-react";
import { VariationsButton } from "@/components/recipe/variations-button";
import { TranslateButton } from "@/components/recipe/translate-button";
import { AddToShoppingListButton } from "@/components/recipe/add-to-shopping-list-button";
import { MealPairingButton } from "@/components/recipe/meal-pairing-button";
import { DrinkPairingButton } from "@/components/recipe/drink-pairing-button";
import { AdaptRecipeButton } from "@/components/recipe/adapt-recipe-button";
import { PrintButton } from "@/components/recipe/print-button";
import { VersionHistoryButton } from "@/components/recipe/version-history-button";
import { DeleteRecipeButton } from "@/components/recipe/delete-recipe-button";
import { NutritionPanel } from "@/components/recipe/nutrition-panel";
import { auth } from "@/lib/auth/server";
import { db, recipes, ratings, favorites, avg } from "@epicure/db";
import { and, eq, count } from "@epicure/db";
import { Badge } from "@/components/ui/badge";
import { buttonVariants } from "@/components/ui/button";
import { Separator } from "@/components/ui/separator";
import { ServingScaler } from "@/components/recipe/serving-scaler";
import { FavoriteButton } from "@/components/social/favorite-button";
import { RatingStars } from "@/components/social/rating-stars";
import { CommentsSection } from "@/components/social/comments-section";
import { getPublicUrl } from "@/lib/storage";
import { cn } from "@/lib/utils";

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

export async function generateMetadata({ params }: Params): Promise<Metadata> {
  const { id } = await params;
  const recipe = await db.query.recipes.findFirst({ where: eq(recipes.id, id) });
  return { title: recipe?.title ?? "Recipe" };
}

const VISIBILITY_LABEL = { private: "Private", unlisted: "Unlisted", public: "Public" };
const VISIBILITY_ICON = { private: Lock, unlisted: Link2, public: Globe };
const DIFFICULTY_COLOR = { easy: "default", medium: "secondary", hard: "destructive" } as const;

const DIETARY_LABELS: Record<string, string> = {
  vegan: "Vegan",
  vegetarian: "Vegetarian",
  glutenFree: "Gluten-free",
  dairyFree: "Dairy-free",
  nutFree: "Nut-free",
  halal: "Halal",
  kosher: "Kosher",
};

export default async function RecipePage({ params }: Params) {
  const { id } = await params;
  const session = await auth.api.getSession({ headers: await headers() });
  if (!session) return null;

  const [recipe, ratingData, favoriteData] = await Promise.all([
    db.query.recipes.findFirst({
      where: and(eq(recipes.id, id), eq(recipes.authorId, session.user.id)),
      with: {
        ingredients: { orderBy: (t, { asc }) => asc(t.order) },
        steps: { orderBy: (t, { asc }) => asc(t.order) },
        photos: { orderBy: (t, { asc }) => asc(t.order) },
      },
    }),
    db.select({ avgScore: avg(ratings.score), total: count() }).from(ratings).where(eq(ratings.recipeId, id)),
    db.query.favorites.findFirst({ where: and(eq(favorites.userId, session.user.id), eq(favorites.recipeId, id)) }),
  ]);

  if (!recipe) notFound();

  const avgScore = ratingData[0]?.avgScore ? parseFloat(ratingData[0].avgScore) : null;
  const ratingCount = ratingData[0]?.total ?? 0;
  const isFavorited = !!favoriteData;

  const cover = recipe.photos.find((p) => p.isCover) ?? recipe.photos[0];
  const totalMins = (recipe.prepMins ?? 0) + (recipe.cookMins ?? 0);
  const activeDietaryTags = Object.entries(recipe.dietaryTags ?? {})
    .filter(([, v]) => v)
    .map(([k]) => DIETARY_LABELS[k])
    .filter(Boolean);

  const VisibilityIcon = VISIBILITY_ICON[recipe.visibility];

  return (
    <div className="max-w-4xl mx-auto space-y-8">
      {/* Header */}
      <div className="space-y-4">
        <h1 className="text-3xl font-bold tracking-tight">{recipe.title}</h1>
        <div className="flex items-center gap-2 overflow-x-auto pb-0.5 [scrollbar-width:none] [-ms-overflow-style:none] [&::-webkit-scrollbar]:hidden">
            <FavoriteButton recipeId={id} initialFavorited={isFavorited} />
            <MealPairingButton recipeId={id} />
            <DrinkPairingButton recipeId={id} />
            {recipe.visibility === "public" && (
              <Link href={`/r/${id}`} target="_blank" className={cn(buttonVariants({ variant: "ghost", size: "sm" }))}>
                <ExternalLink className="h-4 w-4" />
              </Link>
            )}
            {recipe.ingredients.length > 0 && (
              <AddToShoppingListButton
                recipeId={id}
                recipeTitle={recipe.title}
                baseServings={recipe.baseServings}
                ingredients={recipe.ingredients.map((ing) => ({
                  rawName: ing.rawName,
                  quantity: ing.quantity,
                  unit: ing.unit,
                }))}
              />
            )}
            <TranslateButton recipeId={id} />
            {recipe.ingredients.length > 0 && (
              <AdaptRecipeButton
                recipeId={id}
                ingredients={recipe.ingredients.map((ing) => ({ rawName: ing.rawName }))}
              />
            )}
            <VariationsButton
              recipeId={id}
              baseServings={recipe.baseServings}
              difficulty={recipe.difficulty}
              prepMins={recipe.prepMins}
              cookMins={recipe.cookMins}
              ingredients={recipe.ingredients.map((ing) => ({
                rawName: ing.rawName,
                quantity: ing.quantity,
                unit: ing.unit,
                note: ing.note,
                order: ing.order,
              }))}
              steps={recipe.steps.map((s) => ({
                instruction: s.instruction,
                timerSeconds: s.timerSeconds,
                order: s.order,
              }))}
            />
            {recipe.steps.length > 0 && (
              <Link href={`/recipes/${id}/cook`} className={cn(buttonVariants({ variant: "default", size: "sm" }))}>
                <Play className="h-4 w-4" />
                Cook
              </Link>
            )}
            <PrintButton recipeId={id} />
            <VersionHistoryButton recipeId={id} />
            <Link href={`/recipes/${id}/edit`} className={cn(buttonVariants({ variant: "outline", size: "sm" }))}>
              <Pencil className="h-4 w-4" />
              Edit
            </Link>
            <DeleteRecipeButton recipeId={id} />
        </div>

        {avgScore !== null && (
          <div className="flex items-center gap-2">
            <RatingStars recipeId={id} initialScore={Math.round(avgScore)} readonly size="sm" />
            <span className="text-sm text-muted-foreground">{avgScore.toFixed(1)} ({ratingCount})</span>
          </div>
        )}

        {recipe.description && (
          <p className="text-muted-foreground leading-relaxed">{recipe.description}</p>
        )}

        <div className="flex flex-wrap items-center gap-3 text-sm">
          {recipe.difficulty && (
            <Badge variant={DIFFICULTY_COLOR[recipe.difficulty]}>{recipe.difficulty}</Badge>
          )}
          <span className="flex items-center gap-1 text-muted-foreground">
            <Users className="h-4 w-4" />
            {recipe.baseServings} servings
          </span>
          {recipe.prepMins && (
            <span className="flex items-center gap-1 text-muted-foreground">
              <Clock className="h-4 w-4" />
              {recipe.prepMins}m prep
            </span>
          )}
          {recipe.cookMins && (
            <span className="flex items-center gap-1 text-muted-foreground">
              <ChefHat className="h-4 w-4" />
              {recipe.cookMins}m cook
            </span>
          )}
          {totalMins > 0 && recipe.prepMins && recipe.cookMins && (
            <span className="text-muted-foreground">({totalMins}m total)</span>
          )}
          <span className="flex items-center gap-1 text-muted-foreground ml-auto">
            <VisibilityIcon className="h-4 w-4" />
            {VISIBILITY_LABEL[recipe.visibility]}
          </span>
        </div>

        {activeDietaryTags.length > 0 && (
          <div className="flex flex-wrap gap-1.5">
            {activeDietaryTags.map((tag) => (
              <Badge key={tag} variant="secondary" className="text-xs">{tag}</Badge>
            ))}
          </div>
        )}
      </div>

      {/* Cover photo */}
      {cover && (
        <div className="aspect-video overflow-hidden rounded-xl bg-muted">
          <img
            src={getPublicUrl(cover.storageKey)}
            alt={recipe.title}
            className="w-full h-full object-cover"
          />
        </div>
      )}

      <Separator />

      {/* Serving scaler + ingredients */}
      {recipe.ingredients.length > 0 && (
        <div className="space-y-4">
          <h2 className="text-xl font-semibold">Ingredients</h2>
          <ServingScaler
            baseServings={recipe.baseServings}
            recipeTitle={recipe.title}
            ingredients={recipe.ingredients.map((ing) => ({
              id: ing.id,
              rawName: ing.rawName,
              quantity: ing.quantity,
              unit: ing.unit,
              note: ing.note,
              order: ing.order,
            }))}
          />
          <NutritionPanel recipeId={id} initialData={recipe.nutritionData} />
        </div>
      )}

      {recipe.steps.length > 0 && (
        <>
          <Separator />
          <div className="space-y-6">
            <h2 className="text-xl font-semibold">Instructions</h2>
            <ol className="space-y-6">
              {recipe.steps.map((step, i) => (
                <li key={step.id} className="flex gap-4">
                  <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-primary text-primary-foreground text-sm font-bold">
                    {i + 1}
                  </div>
                  <div className="flex-1 space-y-1 pt-1">
                    <p className="leading-relaxed">{step.instruction}</p>
                    {step.timerSeconds && (
                      <p className="text-xs text-muted-foreground flex items-center gap-1">
                        <Clock className="h-3 w-3" />
                        {step.timerSeconds >= 60
                          ? `${Math.floor(step.timerSeconds / 60)}m ${step.timerSeconds % 60 > 0 ? `${step.timerSeconds % 60}s` : ""}`
                          : `${step.timerSeconds}s`}
                      </p>
                    )}
                  </div>
                </li>
              ))}
            </ol>
          </div>
        </>
      )}

      {recipe.photos.length > 1 && (
        <>
          <Separator />
          <div className="space-y-3">
            <h2 className="text-xl font-semibold">Photos</h2>
            <div className="grid grid-cols-3 gap-3">
              {recipe.photos.map((photo) => (
                <div key={photo.id} className="aspect-square rounded-lg overflow-hidden bg-muted">
                  <img src={getPublicUrl(photo.storageKey)} alt="" className="w-full h-full object-cover" />
                </div>
              ))}
            </div>
          </div>
        </>
      )}

      {recipe.visibility !== "private" && (
        <>
          <Separator />
          <div className="space-y-4">
            <RatingStars recipeId={id} initialScore={0} />
          </div>
          <Separator />
          <CommentsSection recipeId={id} currentUserId={session.user.id} />
        </>
      )}
    </div>
  );
}