"use client";

import { useCallback, useRef, useState, type RefObject } from "react";
import {
  animate,
  motion,
  useMotionValue,
  useReducedMotion,
  useSpring,
  useTransform,
  useVelocity,
  type MotionValue,
} from "framer-motion";
import ObjectFace from "./ObjectFace";
import { BOARD_SIZE, BOARD_SPOTS, type TischLabels, type TischObject } from "./types";

interface Handle {
  el: HTMLDivElement;
  x: MotionValue<number>;
  y: MotionValue<number>;
  base: MotionValue<number>;
  spotRotation: number;
}

interface BoardProps {
  objects: TischObject[];
  labels: TischLabels;
}

const TABLE_HEIGHT = 1080;
const SETTLE = { type: "spring", bounce: 0, duration: 0.6 } as const;

/** Desktop: freier Tisch. Objekte lassen sich werfen, federn am Rand zurück und lassen sich aufräumen. */
export default function Board({ objects, labels }: BoardProps) {
  const tableRef = useRef<HTMLDivElement>(null);
  const handles = useRef(new Map<string, Handle>());
  const [order, setOrder] = useState(() => objects.map((o) => o.id));

  const bringToFront = useCallback((id: string) => {
    setOrder((prev) => (prev[prev.length - 1] === id ? prev : [...prev.filter((x) => x !== id), id]));
  }, []);

  const tidy = () => {
    const table = tableRef.current;
    if (!table) return;
    const width = table.clientWidth;
    const gap = 22;
    let cx = 0;
    let cy = 28;
    let rowH = 0;
    objects.forEach((obj, i) => {
      const h = handles.current.get(obj.id);
      if (!h) return;
      const { w, h: oh } = BOARD_SIZE[obj.kind];
      if (cx + w > width && cx > 0) {
        cx = 0;
        cy += rowH + gap;
        rowH = 0;
      }
      const tx = cx - h.el.offsetLeft;
      const ty = cy - h.el.offsetTop;
      cx += w + gap;
      rowH = Math.max(rowH, oh);
      const delay = i * 0.03;
      animate(h.x, tx, { ...SETTLE, delay });
      animate(h.y, ty, { ...SETTLE, delay });
      animate(h.base, 0, { ...SETTLE, delay });
    });
  };

  const mess = () => {
    objects.forEach((obj, i) => {
      const h = handles.current.get(obj.id);
      if (!h) return;
      const delay = i * 0.03;
      animate(h.x, 0, { type: "spring", bounce: 0.2, duration: 0.6, delay });
      animate(h.y, 0, { type: "spring", bounce: 0.2, duration: 0.6, delay });
      animate(h.base, h.spotRotation, { type: "spring", bounce: 0.2, duration: 0.6, delay });
    });
  };

  return (
    <div>
      <div className="mb-4 flex flex-wrap items-center justify-between gap-3 px-4 sm:px-6 lg:px-10">
        <p className="font-mono text-[13px]">{labels.hintBoard}</p>
        <div className="flex gap-2">
          <button
            type="button"
            onClick={mess}
            className="rounded-full px-5 py-3 text-[15px] font-semibold shadow-[inset_0_0_0_1.5px_rgb(var(--plakat-ink))] transition-[background-color,color,transform] duration-150 ease-out hover:bg-ink hover:text-paper active:scale-[0.97]"
          >
            {labels.mess}
          </button>
          <button
            type="button"
            onClick={tidy}
            className="rounded-full bg-ink px-5 py-3 text-[15px] font-semibold text-paper transition-transform duration-150 ease-out active:scale-[0.97]"
          >
            {labels.tidy}
          </button>
        </div>
      </div>

      <div
        ref={tableRef}
        className="relative mx-4 border-t-2 border-ink bg-[radial-gradient(circle_at_1px_1px,rgb(var(--plakat-ink)/0.16)_1px,transparent_0)] [background-size:22px_22px] sm:mx-6 lg:mx-10"
        style={{ height: TABLE_HEIGHT }}
      >
        {objects.map((obj, i) => (
          <BoardItem
            key={obj.id}
            obj={obj}
            labels={labels}
            spot={BOARD_SPOTS[i % BOARD_SPOTS.length]}
            z={order.indexOf(obj.id) + 1}
            tableRef={tableRef}
            onFront={() => bringToFront(obj.id)}
            register={(h) => {
              if (h) handles.current.set(obj.id, h);
              else handles.current.delete(obj.id);
            }}
          />
        ))}
      </div>
    </div>
  );
}

interface BoardItemProps {
  obj: TischObject;
  labels: TischLabels;
  spot: { x: number; y: number; r: number };
  z: number;
  tableRef: RefObject<HTMLDivElement | null>;
  onFront: () => void;
  register: (h: Handle | null) => void;
}

function BoardItem({ obj, labels, spot, z, tableRef, onFront, register }: BoardItemProps) {
  const reduce = useReducedMotion();
  const [flipped, setFlipped] = useState(false);
  const [lifted, setLifted] = useState(false);
  // Framer meldet nach einem Wurf trotzdem einen Tap; der soll die Karte nicht umdrehen
  const dragged = useRef(false);
  const x = useMotionValue(0);
  const y = useMotionValue(0);
  const base = useMotionValue(spot.r);
  // Neigung folgt der Wurfgeschwindigkeit, geglättet über eine Feder
  const vx = useVelocity(x);
  const tilt = useSpring(useTransform(vx, [-1600, 0, 1600], [-10, 0, 10]), { stiffness: 300, damping: 30 });
  const rotate = useTransform(() => base.get() + (reduce ? 0 : tilt.get()));

  const { w, h } = BOARD_SIZE[obj.kind];
  const canFlip = obj.kind === "project";
  const radius = { sticker: "rounded-full", photo: "rounded-md", book: "rounded-[6px_14px_14px_6px]" }[obj.kind as string] ?? "rounded-2xl";

  return (
    <motion.div
      ref={(el) => register(el ? { el, x, y, base, spotRotation: spot.r } : null)}
      drag
      dragConstraints={tableRef}
      dragElastic={0.18}
      dragTransition={{ power: 0.35, timeConstant: 320, bounceStiffness: 260, bounceDamping: 22 }}
      whileDrag={{ scale: 1.05 }}
      onPointerDown={() => {
        dragged.current = false;
        onFront();
      }}
      onDragStart={() => {
        dragged.current = true;
        setLifted(true);
      }}
      onDragEnd={() => setLifted(false)}
      onTap={canFlip ? () => !dragged.current && setFlipped((f) => !f) : undefined}
      onKeyDown={
        canFlip
          ? (e) => {
              if (e.key === " ") {
                e.preventDefault();
                setFlipped((f) => !f);
              }
            }
          : undefined
      }
      tabIndex={canFlip ? 0 : undefined}
      role={canFlip ? "button" : undefined}
      aria-pressed={canFlip ? flipped : undefined}
      aria-label={canFlip && obj.kind === "project" ? obj.title : undefined}
      className={`absolute cursor-grab touch-none select-none active:cursor-grabbing ${radius} transition-shadow duration-200 ease-out ${
        lifted ? "shadow-[14px_16px_0_rgb(var(--plakat-ink))]" : "shadow-[6px_6px_0_rgb(var(--plakat-ink))]"
      }`}
      style={{
        x,
        y,
        rotate,
        width: w,
        height: h,
        left: `min(${spot.x * 100}%, calc(100% - ${w}px))`,
        top: spot.y,
        zIndex: z,
      }}
    >
      <ObjectFace obj={obj} labels={labels} flipped={flipped} />
    </motion.div>
  );
}