"use client";

import { useState } from "react";
import { ChevronDown, ChevronRight } from "lucide-react";
import { COMPONENTS, COMPONENT_CATEGORIES, type ComponentMeta } from "@/lib/componentMeta";
import { ComponentIcon } from "@/components/canvas/ComponentIcon";
import { hxFamily } from "@/lib/hxFamily";

export default function ComponentPalette() {
  const [collapsed, setCollapsed] = useState<Record<string, boolean>>({
    Advanced: true,
    Generic: true,
  });
  const toggle = (cat: string) => setCollapsed((c) => ({ ...c, [cat]: !c[cat] }));

  const onDragStart = (e: React.DragEvent, type: string) => {
    e.dataTransfer.setData("application/entropyk-type", type);
    e.dataTransfer.effectAllowed = "move";
  };

  return (
    <aside className="flex h-full w-60 flex-col border-r border-[var(--line)] bg-[var(--panel)]">
      <div className="flex h-9 items-center justify-between px-3">
        <span className="eyebrow">Bibliothèque</span>
        <span className="mono text-[10px] text-[var(--ink-faint)]">{COMPONENTS.length}</span>
      </div>
      <div className="h-px w-full bg-[var(--line)]" />

      <div className="flex-1 overflow-y-auto py-1">
        {COMPONENT_CATEGORIES.map((cat) => {
          const items = COMPONENTS.filter((c) => c.category === cat);
          if (items.length === 0) return null;
          const isOpen = !collapsed[cat];
          return (
            <div key={cat} className="palette-cat">
              <button
                type="button"
                onClick={() => toggle(cat)}
                aria-expanded={isOpen}
                className="palette-cat-toggle flex w-full items-center gap-1 px-2.5 py-1.5 text-left hover:bg-[var(--chrome-2)]"
              >
                {isOpen ? (
                  <ChevronDown size={12} className="text-[var(--ink-faint)]" />
                ) : (
                  <ChevronRight size={12} className="text-[var(--ink-faint)]" />
                )}
                <span className="eyebrow">{cat}</span>
                <span className="mono ml-1 text-[9px] text-[var(--ink-faint)]">{items.length}</span>
                {cat === "Advanced" && (
                  <span className="ml-auto text-[8px] font-medium text-[var(--ink-faint)]">
                    rare
                  </span>
                )}
              </button>
              <div className={`palette-cat-body ${isOpen ? "is-open" : "is-closed"}`}>
                <div className="palette-cat-inner pb-1">
                  {items.map((c, i) => (
                    <PaletteItem
                      key={c.type}
                      meta={c}
                      index={i}
                      onDragStart={onDragStart}
                    />
                  ))}
                </div>
              </div>
            </div>
          );
        })}
      </div>

      <div className="h-px w-full bg-[var(--line)]" />
      <p className="px-3 py-2 text-[10px] leading-relaxed text-[var(--ink-faint)]">
        Glisse un composant sur le schéma. Relie les ports. Un pipe/gaine déposé sur une ligne
        s’insère automatiquement (même milieu : vert / bleu / jaune).
      </p>
    </aside>
  );
}

function PaletteItem({
  meta,
  index,
  onDragStart,
}: {
  meta: ComponentMeta;
  index: number;
  onDragStart: (e: React.DragEvent, type: string) => void;
}) {
  const family = hxFamily(meta.type);
  const color = family?.accent ?? meta.color;

  return (
    <div
      draggable
      onDragStart={(e) => onDragStart(e, meta.type)}
      className="palette-item group mx-1.5 flex cursor-grab items-center gap-2.5 rounded-[2px] px-2 py-1.5 hover:bg-[var(--chrome-2)] active:cursor-grabbing"
      style={{ ["--i" as string]: index }}
      title={meta.help ?? meta.description}
    >
      <span className="grid h-9 w-9 flex-shrink-0 place-items-center">
        <span style={{ width: 30, height: 30 }}>
          <ComponentIcon type={meta.type} color={color} />
        </span>
      </span>
      <span className="min-w-0 flex-1">
        <span className="block truncate text-[12px] text-[var(--ink-dim)] group-hover:text-[var(--ink)]">
          {meta.label}
        </span>
        {family && (
          <span className="mono text-[8px] uppercase tracking-[0.08em] text-[var(--ink-faint)]">
            {family.badge} · {family.label}
          </span>
        )}
      </span>
    </div>
  );
}