import {
  type PointerEvent,
  type SyntheticEvent,
  type RefObject,
} from "react";
import {
  ArrowLeft,
  Share2,
  Download,
  MapPin,
  ShoppingCart,
  RefreshCw,
  RotateCcw,
  Paintbrush,
  Loader2,
} from "lucide-react";
import type { Product } from "../../types";
import type { SegmentMeta } from "../../hooks/useSegmentCanvas";

interface RoomPreviewPanelProps {
  previewImage?: string | null;
  offset: { x: number; y: number };
  zoom: number;
  imageSize: { width: number; height: number };
  wrapperRef: RefObject<HTMLDivElement | null>;
  canvasRef: RefObject<HTMLCanvasElement | null>;
  selectedProduct: Product | null;
  selectedMasks: Set<number>;
  hoveredMask: number;
  segmentMeta: Map<number, SegmentMeta>;
  isApplying: boolean;
  onBack: () => void;
  onPointerDown: (event: PointerEvent<HTMLDivElement>) => void;
  onPointerMove: (event: PointerEvent<HTMLDivElement>) => void;
  onPointerUp: (event: PointerEvent<HTMLDivElement>) => void;
  updateImageSize: (img: HTMLImageElement) => void;
  onCanvasMouseMove: (e: React.MouseEvent<HTMLCanvasElement>) => void;
  onCanvasMouseLeave: () => void;
  onCanvasClick: (e: React.MouseEvent<HTMLCanvasElement>) => void;
  onApplyTexture: () => void;
  onReset: () => void;
  onDownload: () => Promise<void>;
  onShare: () => Promise<void>;
}

export function RoomPreviewPanel({
  previewImage,
  offset,
  zoom,
  imageSize,
  wrapperRef,
  canvasRef,
  selectedProduct,
  selectedMasks,
  hoveredMask,
  segmentMeta,
  isApplying,
  onBack,
  onPointerDown,
  onPointerMove,
  onPointerUp,
  updateImageSize,
  onCanvasMouseMove,
  onCanvasMouseLeave,
  onCanvasClick,
  onApplyTexture,
  onReset,
  onDownload,
  onShare,
}: RoomPreviewPanelProps) {
  const canApply = selectedMasks.size > 0 && selectedProduct != null;

  const getLabel = (index: number) =>
    segmentMeta.get(index)?.label ?? `Zona ${index}`;

  return (
    <div className="w-full h-full bg-white overflow-hidden">
      <div className="relative h-full overflow-hidden lg:rounded-lg bg-[#f4f8ff]">

        {/* ── Mobile top bar ───────────────────────────────────────── */}
        {/* pr-12 reserva espacio a la derecha para el botón .hr-close del padre */}
        <div className="lg:hidden absolute left-0 right-0 top-0 z-10 h-12 bg-white shadow-sm flex items-center justify-between px-3 pr-12">
          <button
            onClick={onBack}
            className="p-2 rounded-full hover:bg-gray-100 transition-colors"
          >
            <ArrowLeft className="h-5 w-5 text-[#333]" />
          </button>
          <div className="flex items-center gap-1">
            <button
              onClick={onShare}
              className="p-2 rounded-full hover:bg-[#eaf1ff] transition-colors"
            >
              <Share2 className="h-5 w-5 text-[#0047AB]" />
            </button>
            <button
              onClick={onDownload}
              className="p-2 rounded-full hover:bg-[#eaf1ff] transition-colors"
            >
              <Download className="h-5 w-5 text-[#0047AB]" />
            </button>
          </div>
        </div>

        {/* ── Desktop top bar ──────────────────────────────────────── */}
        <div className="pointer-events-none hidden lg:flex absolute left-1/2 top-0 z-10 -translate-x-1/2 w-[80%] h-16 rounded-b-md bg-white shadow-sm items-center justify-center gap-4 px-3">
          <button
            onClick={onBack}
            className="pointer-events-auto rounded-full bg-[#333333] px-4 py-2 text-sm font-semibold text-white hover:bg-black flex items-center gap-2"
          >
            <ArrowLeft className="h-4 w-4" /> Cambiar de Habitación
          </button>
          <span className="text-gray-400">|</span>
          <button
            onClick={onShare}
            className="pointer-events-auto rounded-full bg-transparent px-4 py-2 text-sm font-medium text-[#0047AB] hover:bg-[#eaf1ff] flex items-center gap-2"
          >
            <Share2 className="h-4 w-4 text-[#0047AB]" />
            Compartir
          </button>
          <button
            onClick={onDownload}
            className="pointer-events-auto rounded-full bg-transparent px-4 py-2 text-sm font-medium text-[#0047AB] hover:bg-[#eaf1ff] flex items-center gap-2"
          >
            <Download className="h-4 w-4 text-[#0047AB]" /> Descargar
          </button>
          <a
            href="https://nauffargermany.com/gt/sucursales-2/"
            target="_blank"
            rel="noopener noreferrer"
            className="pointer-events-auto rounded-full bg-transparent px-4 py-2 text-sm font-medium text-[#0047AB] hover:bg-[#eaf1ff] flex items-center gap-2"
          >
            <MapPin className="h-4 w-4 text-[#0047AB]" /> Encuentra tu tienda
          </a>
          {selectedProduct?.detailUrl ? (
            <a
              href={selectedProduct.detailUrl}
              target="_blank"
              rel="noopener noreferrer"
              className="pointer-events-auto rounded-full bg-transparent px-4 py-2 text-sm font-medium text-[#0047AB] hover:bg-[#eaf1ff] flex items-center gap-2"
            >
              <ShoppingCart className="h-4 w-4 text-[#0047AB]" /> Ir a la página del producto
            </a>
          ) : (
            <button
              disabled
              className="pointer-events-auto rounded-full bg-transparent px-4 py-2 text-sm font-medium text-gray-300 flex items-center gap-2 cursor-default"
            >
              <ShoppingCart className="h-4 w-4 text-gray-300" /> Ir a la página del producto
            </button>
          )}
        </div>

        {/* ── Área de imagen + canvas ──────────────────────────────── */}
        <div
          ref={wrapperRef}
          className="absolute inset-x-0 top-12 lg:top-16 bottom-12 lg:bottom-16 flex items-center justify-center bg-[#edf4ff] overflow-hidden"
          onPointerDown={onPointerDown}
          onPointerMove={onPointerMove}
          onPointerUp={onPointerUp}
        >
          {previewImage ? (
            <div
              style={{
                transform: `translate(${offset.x}px, ${offset.y}px) scale(${zoom})`,
                transformOrigin: "center center",
                position: "relative",
                display: "inline-flex",
                lineHeight: 0,
                ...(imageSize.width > 0
                  ? { width: imageSize.width, height: imageSize.height }
                  : {}),
              }}
            >
              <img
                src={previewImage}
                alt="Vista previa de la habitación"
                draggable={false}
                onDragStart={(e) => e.preventDefault()}
                onLoad={(event: SyntheticEvent<HTMLImageElement>) =>
                  updateImageSize(event.currentTarget)
                }
                style={{
                  display: "block",
                  width: imageSize.width > 0 ? "100%" : "auto",
                  height: imageSize.height > 0 ? "100%" : "auto",
                  maxWidth: imageSize.width > 0 ? "none" : "100%",
                  maxHeight: imageSize.height > 0 ? "none" : "100%",
                  objectFit: "contain",
                }}
              />
              <canvas
                ref={canvasRef}
                style={{
                  position: "absolute",
                  inset: 0,
                  width: "100%",
                  height: "100%",
                  cursor: "crosshair",
                }}
                onMouseMove={onCanvasMouseMove}
                onMouseLeave={onCanvasMouseLeave}
                onClick={onCanvasClick}
              />
            </div>
          ) : (
            <div className="flex h-full w-full items-center justify-center text-[#707070] text-sm px-6 text-center">
              No hay vista previa disponible aún.
            </div>
          )}
        </div>

        {/* ── Hint de selección ────────────────────────────────────── */}
        {previewImage && selectedMasks.size === 0 && (
          <div className="pointer-events-none absolute top-14 lg:top-20 left-1/2 -translate-x-1/2 z-10 bg-black/50 text-white text-xs px-3 py-1.5 rounded-full whitespace-nowrap">
            {hoveredMask > 0
              ? `${getLabel(hoveredMask)} — haz clic para seleccionar`
              : "Haz clic sobre una zona de la imagen para seleccionarla"}
          </div>
        )}

        {/* ── Mobile bottom bar ────────────────────────────────────── */}
        <div className="pointer-events-none lg:hidden absolute left-0 right-0 bottom-0 z-10 h-12 bg-white border-t border-gray-100 shadow-sm flex items-center px-3 gap-2">
          {selectedProduct && (
            <div className="flex items-center gap-2 min-w-0 flex-1">
              <img
                src={selectedProduct.image}
                alt={selectedProduct.name}
                className="w-8 h-8 object-cover rounded-md border border-gray-200 shrink-0"
              />
              <div className="min-w-0">
                <p className="text-[10px] text-[#707070] truncate">{selectedProduct.brand}</p>
                <p className="text-xs font-semibold text-[#333] truncate leading-tight">{selectedProduct.name}</p>
              </div>
            </div>
          )}
          {!selectedProduct && selectedMasks.size > 0 && (
            <p className="text-xs text-[#0047AB] font-medium truncate flex-1">
              {[...selectedMasks].map(getLabel).join(", ")}
            </p>
          )}
          {!selectedProduct && selectedMasks.size === 0 && <div className="flex-1" />}

          <div className="flex items-center gap-1 ml-auto shrink-0">
            {canApply && (
              <button
                onClick={onApplyTexture}
                disabled={isApplying}
                className="pointer-events-auto flex items-center gap-1.5 bg-[#0047AB] text-white px-3 py-1.5 rounded-full text-xs font-semibold hover:bg-[#003a94] disabled:opacity-60 transition-colors"
              >
                {isApplying ? (
                  <Loader2 className="h-3 w-3 animate-spin" />
                ) : (
                  <Paintbrush className="h-3 w-3" />
                )}
                {isApplying ? "Aplicando..." : "Aplicar"}
              </button>
            )}
            <button
              onClick={onReset}
              className="pointer-events-auto p-2 rounded-full hover:bg-[#eaf1ff] transition-colors"
            >
              <RefreshCw className="h-4 w-4 text-[#0047AB]" />
            </button>
          </div>
        </div>

        {/* ── Desktop bottom bar ───────────────────────────────────── */}
        <div className="pointer-events-none hidden lg:flex absolute left-1/2 bottom-0 z-10 -translate-x-1/2 w-[80%] h-16 rounded-t-md bg-white border border-[#0047AB]/10 shadow-sm items-center justify-start gap-4 px-4">
          {selectedProduct && (
            <div className="pointer-events-none flex items-center gap-3">
              <img
                src={selectedProduct.image}
                alt={selectedProduct.name}
                className="w-10 h-10 object-cover rounded-md border border-gray-200"
              />
              <div>
                <p className="text-[#707070] text-xs">{selectedProduct.brand}</p>
                <p className="font-semibold text-[#333333] text-sm leading-tight">
                  {selectedProduct.name}
                </p>
              </div>
            </div>
          )}

          {selectedMasks.size > 0 && (
            <p className="text-xs text-[#0047AB] font-medium truncate max-w-[260px]">
              {[...selectedMasks].map(getLabel).join(", ")}
            </p>
          )}

          <div className="flex-1" />

          {canApply && (
            <button
              onClick={onApplyTexture}
              disabled={isApplying}
              className="pointer-events-auto flex items-center gap-2 bg-[#0047AB] text-white px-4 py-2 rounded-full text-sm font-semibold hover:bg-[#003a94] disabled:opacity-60 transition-colors"
            >
              {isApplying ? (
                <Loader2 className="h-4 w-4 animate-spin" />
              ) : (
                <Paintbrush className="h-4 w-4" />
              )}
              {isApplying ? "Aplicando..." : "Aplicar textura"}
            </button>
          )}

          <button
            onClick={onReset}
            className="pointer-events-auto rounded-full bg-transparent px-4 py-2 text-sm font-medium text-[#0047AB] hover:bg-[#eaf1ff] flex items-center gap-2"
          >
            <span className="inline-flex items-center justify-center rounded-full bg-[#eaf1ff] p-2">
              <RefreshCw className="h-4 w-4 text-[#0047AB]" />
            </span>
            Reiniciar
          </button>
          <button className="pointer-events-auto rounded-full bg-transparent px-4 py-2 text-sm font-medium text-[#0047AB] hover:bg-[#eaf1ff] flex items-center gap-2">
            <span className="inline-flex items-center justify-center rounded-full bg-[#eaf1ff] p-2">
              <RotateCcw className="h-4 w-4 text-[#0047AB]" />
            </span>
            Girar
          </button>
        </div>

      </div>
    </div>
  );
}