"use client";

import { useState, useTransition } from "react";
import Link from "next/link";
import { useRouter, usePathname } from "next/navigation";
import { PlusCircle, Sparkles, Link2, Search, X, SlidersHorizontal, ArrowUpDown } from "lucide-react";
import { useTranslations } from "next-intl";
import { Button, buttonVariants } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuGroup,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { AiGenerateDialog } from "./ai-generate-dialog";
import { UrlImportDialog } from "./url-import-dialog";

function TagFilterInput({ value, onChange }: { value: string; onChange: (v: string) => void }) {
  const [local, setLocal] = useState(value);
  return (
    <input
      value={local}
      onChange={(e) => setLocal(e.target.value)}
      onKeyDown={(e) => { if (e.key === "Enter") onChange(local); }}
      onBlur={() => onChange(local)}
      placeholder="Filter by tag…"
      className="w-full h-7 px-2 text-sm rounded-md border border-input bg-background focus:outline-none focus:ring-1 focus:ring-ring"
    />
  );
}
import { cn } from "@/lib/utils";

const SORT_LABELS: Record<string, string> = {
  updated_desc: "Recently updated",
  updated_asc: "Oldest updated",
  created_desc: "Newest first",
  created_asc: "Oldest first",
  title_asc: "Title A–Z",
  title_desc: "Title Z–A",
};

const VISIBILITY_LABELS: Record<string, string> = {
  "": "All",
  private: "Private",
  unlisted: "Unlisted",
  public: "Public",
};

const DIFFICULTY_LABELS: Record<string, string> = {
  "": "Any difficulty",
  easy: "Easy",
  medium: "Medium",
  hard: "Hard",
};

export function RecipesHeader({
  count,
  initialQuery = "",
  initialSort = "updated_desc",
  initialVisibility = "",
  initialDifficulty = "",
  initialTag = "",
}: {
  count: number;
  initialQuery?: string;
  initialSort?: string;
  initialVisibility?: string;
  initialDifficulty?: string;
  initialTag?: string;
}) {
  const router = useRouter();
  const pathname = usePathname();
  const t = useTranslations("recipes");
  const [aiOpen, setAiOpen] = useState(false);
  const [urlOpen, setUrlOpen] = useState(false);
  const [query, setQuery] = useState(initialQuery);
  const [, startTransition] = useTransition();

  function pushParams(overrides: Record<string, string>) {
    const params = new URLSearchParams();
    const current = {
      q: query,
      sort: initialSort,
      visibility: initialVisibility,
      difficulty: initialDifficulty,
      tag: initialTag,
      ...overrides,
    };
    if (current.q?.trim()) params.set("q", current.q.trim());
    if (current.sort && current.sort !== "updated_desc") params.set("sort", current.sort);
    if (current.visibility) params.set("visibility", current.visibility);
    if (current.difficulty) params.set("difficulty", current.difficulty);
    if (current.tag?.trim()) params.set("tag", current.tag.trim());
    startTransition(() => router.push(`${pathname}?${params.toString()}`));
  }

  function handleSearch(value: string) {
    setQuery(value);
    pushParams({ q: value });
  }

  const activeFilterCount = [initialVisibility, initialDifficulty, initialTag].filter(Boolean).length;
  const sortChanged = initialSort !== "updated_desc";

  return (
    <>
      <div className="space-y-4">
        <div className="flex items-center justify-between">
          <div>
            <h1 className="text-3xl font-bold tracking-tight">{t("title")}</h1>
            <p className="text-muted-foreground mt-1">
              {count === 0
                ? t("subtitle")
                : t(count !== 1 ? "resultPlural" : "resultSingular", { count })}
            </p>
          </div>
          <div className="flex items-center gap-2">
            <Button variant="ghost" size="sm" onClick={() => setUrlOpen(true)}>
              <Link2 className="h-4 w-4" />
              {t("importUrl")}
            </Button>
            <Button variant="ghost" size="sm" onClick={() => setAiOpen(true)}>
              <Sparkles className="h-4 w-4" />
              {t("generate")}
            </Button>
            <Link href="/recipes/new" className={cn(buttonVariants({ size: "sm" }))}>
              <PlusCircle className="h-4 w-4" />
              {t("new")}
            </Link>
          </div>
        </div>

        <div className="flex flex-wrap gap-2">
          {/* Search */}
          <div className="relative flex-1 min-w-[200px] max-w-sm">
            <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground pointer-events-none" />
            <Input
              value={query}
              onChange={(e) => handleSearch(e.target.value)}
              placeholder={t("search")}
              className="pl-9 pr-9"
            />
            {query && (
              <button
                onClick={() => handleSearch("")}
                className="absolute right-3 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
              >
                <X className="h-4 w-4" />
              </button>
            )}
          </div>

          {/* Sort */}
          <DropdownMenu>
            <DropdownMenuTrigger
              className={cn(
                buttonVariants({ variant: sortChanged ? "secondary" : "outline", size: "sm" }),
                "gap-1.5"
              )}
            >
              <ArrowUpDown className="h-4 w-4" />
              {SORT_LABELS[initialSort] ?? "Sort"}
            </DropdownMenuTrigger>
            <DropdownMenuContent align="start">
              <DropdownMenuGroup>
                <DropdownMenuLabel>Sort by</DropdownMenuLabel>
                <DropdownMenuSeparator />
                {Object.entries(SORT_LABELS).map(([value, label]) => (
                  <DropdownMenuItem
                    key={value}
                    onClick={() => pushParams({ sort: value })}
                    className={cn(initialSort === value && "font-medium text-primary")}
                  >
                    {label}
                  </DropdownMenuItem>
                ))}
              </DropdownMenuGroup>
            </DropdownMenuContent>
          </DropdownMenu>

          {/* Filters */}
          <DropdownMenu>
            <DropdownMenuTrigger
              className={cn(
                buttonVariants({ variant: activeFilterCount > 0 ? "secondary" : "outline", size: "sm" }),
                "gap-1.5"
              )}
            >
              <SlidersHorizontal className="h-4 w-4" />
              Filter
              {activeFilterCount > 0 && (
                <Badge variant="secondary" className="ml-1 h-4 min-w-4 px-1 text-xs">
                  {activeFilterCount}
                </Badge>
              )}
            </DropdownMenuTrigger>
            <DropdownMenuContent align="start" className="w-48">
              <DropdownMenuGroup>
                <DropdownMenuLabel>Visibility</DropdownMenuLabel>
                {Object.entries(VISIBILITY_LABELS).map(([value, label]) => (
                  <DropdownMenuItem
                    key={value}
                    onClick={() => pushParams({ visibility: value })}
                    className={cn(initialVisibility === value && "font-medium text-primary")}
                  >
                    {label}
                  </DropdownMenuItem>
                ))}
              </DropdownMenuGroup>
              <DropdownMenuSeparator />
              <DropdownMenuGroup>
                <DropdownMenuLabel>Difficulty</DropdownMenuLabel>
                {Object.entries(DIFFICULTY_LABELS).map(([value, label]) => (
                  <DropdownMenuItem
                    key={value}
                    onClick={() => pushParams({ difficulty: value })}
                    className={cn(initialDifficulty === value && "font-medium text-primary")}
                  >
                    {label}
                  </DropdownMenuItem>
                ))}
              </DropdownMenuGroup>
              <DropdownMenuSeparator />
              <DropdownMenuGroup>
                <DropdownMenuLabel>Tag</DropdownMenuLabel>
                <div className="px-2 py-1">
                  <TagFilterInput
                    value={initialTag}
                    onChange={(v) => pushParams({ tag: v })}
                  />
                </div>
              </DropdownMenuGroup>
              {activeFilterCount > 0 && (
                <>
                  <DropdownMenuSeparator />
                  <DropdownMenuGroup>
                    <DropdownMenuItem
                      onClick={() => pushParams({ visibility: "", difficulty: "", tag: "" })}
                      className="text-muted-foreground"
                    >
                      <X className="h-3 w-3 mr-1.5" /> Clear filters
                    </DropdownMenuItem>
                  </DropdownMenuGroup>
                </>
              )}
            </DropdownMenuContent>
          </DropdownMenu>
        </div>
      </div>

      <AiGenerateDialog open={aiOpen} onOpenChange={setAiOpen} />
      <UrlImportDialog open={urlOpen} onOpenChange={setUrlOpen} />
    </>
  );
}