"use client";

import { RiHeart3Line as BookHeart, RiSearchLine as Search, RiEqualizerLine as SlidersHorizontal } from "@remixicon/react";
import Link from "next/link";
import { ViewTransition, useMemo, useState, type ReactNode } from "react";
import { APPLIANCES, CUISINES, MEAL_KIND_LABELS, STYLES, toggle } from "@/app/lib/plan";
import type { Appliance, CookingStyle, Cuisine, MealKind } from "@/app/types";
import { Chip } from "./Chip";
import { ApplianceIcon, StyleIcon } from "./Icons";

export interface RecipeSummary {
  id: string;
  title: string;
  description: string;
  cuisine: Cuisine;
  kind: MealKind;
  styles: CookingStyle[];
  appliances: Appliance[];
  prepTime: number;
  ingredientText: string;
}

type KindFilter = "all" | MealKind;
type SortOrder = "az" | "quickest";

export function RecipeBrowser({ recipes }: { recipes: RecipeSummary[] }) {
  const [query, setQuery] = useState("");
  const [kind, setKind] = useState<KindFilter>("all");
  const [cuisines, setCuisines] = useState<Cuisine[]>([]);
  const [styles, setStyles] = useState<CookingStyle[]>([]);
  const [kitchen, setKitchen] = useState<Appliance[]>([]);
  const [sort, setSort] = useState<SortOrder>("az");
  const [mobileFiltersOpen, setMobileFiltersOpen] = useState(false);

  const visible = useMemo(() => {
    const needle = query.trim().toLowerCase();
    return recipes
      .filter((r) => kind === "all" || r.kind === kind)
      .filter((r) => cuisines.length === 0 || cuisines.includes(r.cuisine))
      .filter((r) => styles.length === 0 || r.styles.some((s) => styles.includes(s)))
      .filter((r) => kitchen.length === 0 || r.appliances.every((a) => kitchen.includes(a)))
      .filter((r) => !needle || r.title.toLowerCase().includes(needle) || r.ingredientText.includes(needle))
      .sort((a, b) => (sort === "quickest" ? a.prepTime - b.prepTime : 0) || a.title.localeCompare(b.title));
  }, [recipes, query, kind, cuisines, styles, kitchen, sort]);

  const activeChipCount = (kind !== "all" ? 1 : 0) + cuisines.length + styles.length + kitchen.length;
  const filtersActive = Boolean(query) || activeChipCount > 0;

  const clearAll = () => {
    setQuery("");
    setKind("all");
    setCuisines([]);
    setStyles([]);
    setKitchen([]);
  };

  return (
    <div className="grid gap-8 lg:grid-cols-[18.5rem_1fr]">
      {/* --- Search + Collapsible Mobile Filters / Sticky Desktop Sidebar --- */}
      <aside className="space-y-4 lg:sticky lg:top-20 lg:self-start">
        <div className="flex items-center gap-2">
          <div className="relative min-w-0 flex-1">
            <Search className="pointer-events-none absolute top-1/2 left-3 size-4 -translate-y-1/2 text-ink-faint" aria-hidden />
            <input
              type="search"
              placeholder="Search dishes or ingredients…"
              value={query}
              onChange={(e) => setQuery(e.target.value)}
              className="min-h-10 w-full rounded-lg border border-line-strong py-2 pr-3 pl-9 text-sm"
              aria-label="Search recipes or ingredients"
            />
          </div>

          <button
            type="button"
            aria-expanded={mobileFiltersOpen}
            onClick={() => setMobileFiltersOpen((o) => !o)}
            className={`trim-cap inline-flex min-h-10 shrink-0 items-center gap-1.5 rounded-lg border px-3 py-2 text-sm font-medium lg:hidden ${
              mobileFiltersOpen || activeChipCount > 0
                ? "border-selected-line bg-selected text-ink"
                : "border-line-strong bg-surface text-ink-muted"
            }`}
          >
            <SlidersHorizontal className="size-4" aria-hidden />
            Filters
            {activeChipCount > 0 && (
              <span className="rounded-full bg-brand-600 px-1.5 py-0.5 font-mono text-[11px] font-semibold text-on-accent">
                {activeChipCount}
              </span>
            )}
          </button>
        </div>

        <div className={`space-y-5 ${mobileFiltersOpen ? "block rounded-3xl border border-border-button-default bg-surface p-4" : "hidden"} lg:block lg:border-0 lg:bg-transparent lg:p-0`}>
          <FilterGroup label="Course">
            {(
              [
                ["all", "All"],
                ["breakfast", "Breakfast"],
                ["main", "Lunch & dinner"],
                ["side", "Sides"],
                ["dessert", "Desserts"],
              ] as const
            ).map(([value, label]) => (
              <Chip size="sm" key={value} pressed={kind === value} onClick={() => setKind(value)}>
                {label}
              </Chip>
            ))}
          </FilterGroup>

          <FilterGroup label="Cuisine">
            {CUISINES.map((c) => (
              <Chip size="sm" key={c.id} pressed={cuisines.includes(c.id)} onClick={() => setCuisines((l) => toggle(l, c.id))}>
                {c.label}
              </Chip>
            ))}
          </FilterGroup>

          <FilterGroup label="Style">
            {STYLES.map((s) => (
              <Chip size="sm" key={s.id} pressed={styles.includes(s.id)} onClick={() => setStyles((l) => toggle(l, s.id))}>
                <StyleIcon id={s.id} className="size-3.5" />
                {s.label}
              </Chip>
            ))}
          </FilterGroup>

          <FilterGroup label="Available appliances" hint="Hides recipes needing anything else">
            {APPLIANCES.map((a) => (
              <Chip size="sm" key={a.id} pressed={kitchen.includes(a.id)} onClick={() => setKitchen((l) => toggle(l, a.id))}>
                <ApplianceIcon id={a.id} className="size-3.5" />
                {a.label}
              </Chip>
            ))}
          </FilterGroup>
        </div>
      </aside>

      {/* --- Results -------------------------------------------------------- */}
      <section aria-label="Recipes">
        <div className="mb-4 flex flex-wrap items-center justify-between gap-3 border-b border-line pb-3">
          <p className="text-sm text-ink-muted" aria-live="polite">
            Showing <span className="font-mono font-semibold text-ink">{visible.length}</span> of{" "}
            <span className="font-mono">{recipes.length}</span> recipes
            {filtersActive && (
              <button type="button" onClick={clearAll} className="ml-3 font-medium text-brand-300 hover:underline">
                Reset filters
              </button>
            )}
          </p>

          <label className="flex items-center gap-2 text-sm text-ink-muted">
            Sort
            <select
              value={sort}
              onChange={(e) => setSort(e.target.value as SortOrder)}
              className="min-h-9 rounded-lg border border-line-strong bg-surface px-2.5 py-1 text-sm font-medium text-ink"
            >
              <option value="az">A–Z</option>
              <option value="quickest">Quickest first</option>
            </select>
          </label>
        </div>

        {visible.length === 0 ? (
          <p className="rounded-xl border border-dashed border-line-strong p-10 text-center text-ink-muted">
            No recipes match these filters. Try relaxing an appliance or cuisine filter.
          </p>
        ) : (
          <ul className="grid gap-3.5 sm:grid-cols-2 xl:grid-cols-3">
            {visible.map((r) => {
              const applianceNames = r.appliances.map((a) => APPLIANCES.find((x) => x.id === a)?.label).join(", ") || "No cooking";
              return (
                <li key={r.id}>
                  <Link
                    href={`/recipes/${r.id}`}
                    className="group flex h-full flex-col rounded-3xl border border-border-button-default bg-surface p-4 transition-colors hover:border-line-strong hover:bg-raised/60"
                  >
                    <span className="flex items-center gap-1.5 font-mono text-[11px] tracking-wide text-ink-faint uppercase">
                      {r.styles.includes("caydens_corner") && (
                        <BookHeart className="size-3.5 shrink-0 text-brand-300" strokeWidth={2} aria-hidden />
                      )}
                      <span>
                        {CUISINES.find((c) => c.id === r.cuisine)?.label} · {MEAL_KIND_LABELS[r.kind]}
                      </span>
                    </span>

                    <ViewTransition name={`recipe-title-${r.id}`}>
                      <span className="mt-1 font-serif text-lg leading-snug font-semibold text-ink group-hover:text-brand-300">
                        {r.title}
                      </span>
                    </ViewTransition>

                    <span className="mt-1.5 line-clamp-2 text-sm leading-relaxed text-ink-muted">{r.description}</span>

                    <span className="mt-auto flex items-center justify-between border-t border-line pt-3 mt-4 text-xs text-ink-faint">
                      <span className="font-mono tabular-nums">{r.prepTime} min</span>
                      <span className="inline-flex items-center gap-1.5" title={applianceNames}>
                        {r.appliances.length > 0 ? (
                          <>
                            {r.appliances.map((a) => (
                              <ApplianceIcon key={a} id={a} className="size-3.5 text-ink-muted" />
                            ))}
                            <span className="sr-only">Requires {applianceNames}</span>
                          </>
                        ) : (
                          <span>No cooking</span>
                        )}
                      </span>
                    </span>
                  </Link>
                </li>
              );
            })}
          </ul>
        )}
      </section>
    </div>
  );
}

function FilterGroup({ label, hint, children }: { label: string; hint?: string; children: ReactNode }) {
  return (
    <fieldset>
      <legend className="text-xs font-semibold tracking-wider text-ink-muted uppercase">
        {label} {hint && <span className="font-sans font-normal tracking-normal text-ink-faint normal-case">· {hint}</span>}
      </legend>
      <div className="mt-2 flex flex-wrap gap-1.5">{children}</div>
    </fieldset>
  );
}