'use client';

import React, { useState, useRef } from 'react';
import { Item } from '@/lib/db';
import { inventoryApi, buildPhotoUrl } from '@/lib/api';
import ItemPhotoUpload from '@/components/ItemPhotoUpload';
import { DebugRotationPanel } from '@/components/DebugRotationPanel';
import { X, Camera, Trash2, Wrench } from 'lucide-react';
import { toast } from 'react-hot-toast';

interface ItemDetailModalProps {
  item: Item;
  onClose: () => void;
  onPhotoUpdated?: (photo: { thumbnail_url: string; full_url: string; uploaded_at: string }) => void;
  onItemRefresh?: () => void;
  backendUrl?: string;
}

export default function ItemDetailModal({
  item,
  onClose,
  onPhotoUpdated,
  onItemRefresh,
  backendUrl = '',
}: ItemDetailModalProps) {
  const [showPhotoUpload, setShowPhotoUpload] = useState(false);
  const [showDebugPanel, setShowDebugPanel] = useState(false);
  const [currentPhoto, setCurrentPhoto] = useState<{ thumbnail_url: string; full_url: string } | null>(
    item.photo_path && item.photo_thumbnail_path
      ? { thumbnail_url: item.photo_thumbnail_path, full_url: item.photo_path }
      : item.image_url
        ? { thumbnail_url: item.image_url, full_url: item.image_url }
        : null
  );
  const [isDeleting, setIsDeleting] = useState(false);
  const photoUploadRef = useRef<HTMLDivElement>(null);

  const handlePhotoUploadSuccess = (photo: { thumbnail_url: string; full_url: string; uploaded_at: string }) => {
    setCurrentPhoto({ thumbnail_url: photo.thumbnail_url, full_url: photo.full_url });
    setShowPhotoUpload(false);
    onPhotoUpdated?.(photo);
    onItemRefresh?.();
  };

  const handlePhotoUploadError = (errorMessage: string) => {
    toast.error(errorMessage);
  };

  const handleDeletePhoto = async () => {
    if (!item.id) return;

    if (!window.confirm('Delete this photo? This cannot be undone.')) {
      return;
    }

    setIsDeleting(true);
    try {
      await inventoryApi.deleteItemPhoto(item.id);
      setCurrentPhoto(null);
      toast.success('Photo deleted successfully');
      onItemRefresh?.();
    } catch (error: any) {
      const errorMsg = error?.message || 'Failed to delete photo';
      toast.error(errorMsg);
    } finally {
      setIsDeleting(false);
    }
  };

  return (
    <div className="fixed inset-0 bg-surface-container-lowest/90 flex items-center justify-center z-50 p-4 animate-in fade-in duration-300">
      <div className="level-2 max-w-2xl w-full max-h-[90vh] overflow-y-auto flex flex-col shadow-none">
        {/* Header */}
        <div className="sticky top-0 bg-surface-bright border-b border-border p-4 md:p-6 flex items-center justify-between z-10">
          <div>
            <h2 className="text-xl md:text-2xl font-normal text-white truncate">{item.name}</h2>
            <p className="text-[10px] text-secondary font-normal uppercase tracking-widest mt-0.5">Asset Technical Protocol</p>
          </div>
          <div className="flex items-center gap-2">
            {currentPhoto && (
              <button
                onClick={() => setShowDebugPanel(true)}
                className="p-3 bg-surface-container-lowest border border-border text-primary hover:text-white transition-colors"
                title="Debug rotation & crop"
              >
                <Wrench size={20} />
              </button>
            )}
            <button
              onClick={onClose}
              className="p-3 bg-surface-container-lowest border border-border text-secondary hover:text-white transition-colors"
            >
              <X size={20} />
            </button>
          </div>
        </div>

        {/* Content */}
        <div className="p-4 md:p-6 space-y-8 flex-1">
          {/* Details Grid */}
          <div className="grid grid-cols-2 gap-px bg-border border border-border">
            {[
              { label: 'Category', value: item.category },
              { label: 'Item Type', value: item.type || 'N/A' },
              { label: 'Available Stock', value: item.quantity },
              { label: 'Part Number', value: item.part_number || 'N/A' },
              { label: 'Identifier', value: item.barcode, full: true, mono: true }
            ].map((d, i) => (
              <div key={i} className={`p-4 bg-surface-container ${d.full ? 'col-span-2' : ''}`}>
                <p className="text-[10px] text-secondary font-normal mb-1">{d.label}</p>
                <p className={`text-sm text-white ${d.mono ? 'font-mono' : 'font-normal'}`}>{d.value}</p>
              </div>
            ))}
          </div>

          {/* Photo Section */}
          <div className="space-y-4">
            <h3 className="text-lg font-normal text-white flex items-center gap-2">
              <Camera size={18} className="text-primary" />
              Visual Signature
            </h3>

            {!showPhotoUpload ? (
              <>
                {currentPhoto ? (
                  <div className="space-y-3">
                    <div className="relative bg-surface-container-lowest border border-border overflow-hidden aspect-video">
                      <img
                        src={buildPhotoUrl(backendUrl, currentPhoto.full_url)}
                        alt={item.name}
                        className="w-full h-full object-contain"
                      />
                    </div>
                    <div className="flex gap-2">
                      <button
                        onClick={() => setShowPhotoUpload(true)}
                        className="btn-secondary flex-1 py-3 text-xs"
                      >
                        Capture New Signature
                      </button>
                      <button
                        onClick={handleDeletePhoto}
                        disabled={isDeleting}
                        className="px-4 py-3 bg-error/10 border border-error/30 text-error hover:bg-error/20 disabled:opacity-50 transition-colors text-xs"
                      >
                        <Trash2 size={16} />
                      </button>
                    </div>
                  </div>
                ) : (
                  <div className="bg-surface-container-lowest border border-border p-12 text-center flex flex-col items-center gap-4">
                    <div className="w-16 h-16 bg-surface-container flex items-center justify-center text-muted border border-border">
                       <Camera size={32} />
                    </div>
                    <p className="text-muted text-sm">No recorded visual signatures</p>
                    <button
                      onClick={() => setShowPhotoUpload(true)}
                      className="btn-primary px-8 py-3"
                    >
                      Authorize Capture
                    </button>
                  </div>
                )}
              </>
            ) : (
              <div ref={photoUploadRef} className="bg-surface-container-lowest border border-border p-4 md:p-6 animate-in slide-in-from-top-2 duration-300">
                <div className="mb-4 flex items-center justify-between border-b border-border pb-3">
                  <h4 className="font-normal text-white text-sm">Signature Acquisition Protocol</h4>
                  <button
                    onClick={() => setShowPhotoUpload(false)}
                    className="p-1 text-secondary hover:text-white transition-colors"
                  >
                    <X size={18} />
                  </button>
                </div>
                {item.id && (
                  <ItemPhotoUpload
                    itemId={item.id}
                    onUploadSuccess={handlePhotoUploadSuccess}
                    onError={handlePhotoUploadError}
                  />
                )}
              </div>
            )}
          </div>
        </div>

        <div className="p-4 bg-surface-container-lowest border-t border-border flex justify-end">
           <button 
             onClick={onClose}
             className="btn-secondary px-8 py-2 text-xs"
           >
             Close Protocol
           </button>
        </div>
      </div>

      {/* Debug Rotation Panel */}
      {showDebugPanel && currentPhoto && (
        <DebugRotationPanel
          item={item}
          imageUrl={buildPhotoUrl(backendUrl, currentPhoto.full_url)}
          originalPhotoPath={
            item.labels_data
              ? (() => {
                  try {
                    const parsed = JSON.parse(item.labels_data);
                    const origPath = parsed.image_processing?.original_photo_path;
                    return origPath ? buildPhotoUrl(backendUrl, origPath) : undefined;
                  } catch {
                    return undefined;
                  }
                })()
              : undefined
          }
          originalCropBounds={item.labels_data ? JSON.parse(item.labels_data).image_processing?.crop_bounds : undefined}
          originalRotation={item.labels_data ? JSON.parse(item.labels_data).image_processing?.rotation_degrees : undefined}
          imageProcessing={item.labels_data ? JSON.parse(item.labels_data).image_processing : undefined}
          onClose={() => setShowDebugPanel(false)}
        />
      )}
    </div>
  );
}