import { useRef, useState } from 'react';
import {
  STORE_PACKAGE_IMAGE_MAX_COUNT,
  STORE_PACKAGE_MAX_COUNT,
} from '@dukang/shared-types';
import { emptyPackage, type PackageFormItem } from '../lib/storePackages';
import { uploadFileToOss } from '../lib/upload';

type Props = {
  items: PackageFormItem[];
  onChange: (items: PackageFormItem[]) => void;
  disabled?: boolean;
};

export default function ShopPackagesForm({ items, onChange, disabled }: Props) {
  const [collapsed, setCollapsed] = useState<Record<number, boolean>>({});
  const [uploadingIndex, setUploadingIndex] = useState<number | null>(null);
  const fileRefs = useRef<Record<number, HTMLInputElement | null>>({});

  async function pickPackageImages(pkgIndex: number, fileList?: FileList | null) {
    if (!fileList?.length || disabled) return;
    const current = items[pkgIndex];
    const existing =
      Array.isArray(current.imageUrls) && current.imageUrls.length > 0
        ? current.imageUrls.map((u) => String(u ?? '')).filter((u) => u.trim())
        : current.imageUrl
          ? [String(current.imageUrl)]
          : [];
    const room = Math.max(0, STORE_PACKAGE_IMAGE_MAX_COUNT - existing.length);
    const files = Array.from(fileList).slice(0, room);
    if (!files.length) return;

    setUploadingIndex(pkgIndex);
    try {
      const appended: string[] = [];
      for (const file of files) {
        const result = await uploadFileToOss(file, 'STORE_PACKAGE');
        appended.push(result.url);
      }
      const next = [...existing, ...appended];
      updateAt(pkgIndex, { imageUrls: next, imageUrl: next[0] ?? '' });
    } finally {
      setUploadingIndex(null);
      const input = fileRefs.current[pkgIndex];
      if (input) input.value = '';
    }
  }

  function updateAt(index: number, patch: Partial<PackageFormItem>) {
    onChange(items.map((item, i) => (i === index ? { ...item, ...patch } : item)));
  }

  function addItem() {
    if (items.length >= STORE_PACKAGE_MAX_COUNT) return;
    onChange([...items, emptyPackage(items.length)]);
  }

  function removeAt(index: number) {
    onChange(items.filter((_, i) => i !== index).map((item, i) => ({ ...item, sortOrder: i })));
    setCollapsed((prev) => {
      const next: Record<number, boolean> = {};
      Object.entries(prev).forEach(([k, v]) => {
        const i = Number(k);
        if (i < index) next[i] = v;
        else if (i > index) next[i - 1] = v;
      });
      return next;
    });
  }

  function toggleCollapse(index: number) {
    setCollapsed((prev) => ({ ...prev, [index]: !prev[index] }));
  }

  const list = items.length ? items : [emptyPackage(0)];

  return (
    <div className="shop-packages-form">
      {list.map((item, index) => {
        const isCollapsed = !!collapsed[index];
        const displayName = item.name.trim() || `套餐 ${index + 1}`;
        const filled =
          Array.isArray(item.imageUrls) && item.imageUrls.length > 0
            ? item.imageUrls.map((u) => String(u ?? '')).filter((u) => u.trim())
            : item.imageUrl
              ? [String(item.imageUrl)]
              : [];
        return (
          <section key={index} className={`shop-packages-card${isCollapsed ? ' shop-packages-card--collapsed' : ''}`}>
            <div className="shop-packages-card-head">
              <button
                type="button"
                className="shop-packages-toggle"
                onClick={() => toggleCollapse(index)}
                aria-expanded={!isCollapsed}
                aria-label={isCollapsed ? '展开套餐' : '收起套餐'}
              >
                <span className="material-symbols-outlined">
                  {isCollapsed ? 'expand_more' : 'expand_less'}
                </span>
                <span className="shop-packages-card-title">{displayName}</span>
              </button>
              {!disabled && list.length > 1 ? (
                <button type="button" className="shop-packages-remove" onClick={() => removeAt(index)}>
                  删除
                </button>
              ) : null}
            </div>

            {!isCollapsed ? (
              <>
                <label className="shop-packages-field">
                  <span className="shop-packages-label">套餐名称</span>
                  <input
                    className="shop-packages-input"
                    placeholder="如：套餐A"
                    value={item.name}
                    disabled={disabled}
                    onChange={(e) => updateAt(index, { name: e.target.value })}
                  />
                </label>

                <label className="shop-packages-field">
                  <span className="shop-packages-label">价格（元）</span>
                  <input
                    className="shop-packages-input"
                    type="number"
                    min={0}
                    step="0.01"
                    placeholder="198"
                    value={item.price}
                    disabled={disabled}
                    onChange={(e) => updateAt(index, { price: e.target.value })}
                  />
                </label>

                <label className="shop-packages-field">
                  <span className="shop-packages-label">菜品</span>
                  <textarea
                    className="shop-packages-input"
                    rows={2}
                    placeholder="红烧肉、红烧鱼、油焖茄子"
                    value={item.dishes}
                    disabled={disabled}
                    onChange={(e) => updateAt(index, { dishes: e.target.value })}
                  />
                </label>

                <label className="shop-packages-field">
                  <span className="shop-packages-label">使用时间</span>
                  <textarea
                    className="shop-packages-input"
                    rows={2}
                    placeholder="节假日除外"
                    value={item.usableTime || ''}
                    disabled={disabled}
                    onChange={(e) => updateAt(index, { usableTime: e.target.value })}
                  />
                </label>

                <div className="shop-packages-field">
                  <span className="shop-packages-label">
                    套餐图片（最多 {STORE_PACKAGE_IMAGE_MAX_COUNT} 张，支持批量）
                  </span>
                  {filled.length > 0 ? (
                    <div style={{ display: 'flex', flexWrap: 'wrap', gap: 8, marginBottom: 8 }}>
                      {filled.map((url, imgIndex) => (
                        <div key={`${url}-${imgIndex}`} style={{ position: 'relative', width: 88 }}>
                          <img
                            src={url}
                            alt=""
                            style={{ width: 88, height: 88, objectFit: 'cover', borderRadius: 8 }}
                          />
                          {!disabled ? (
                            <button
                              type="button"
                              className="shop-packages-remove"
                              style={{ position: 'absolute', top: 2, right: 2, margin: 0 }}
                              onClick={() => {
                                const next = filled.filter((_, i) => i !== imgIndex);
                                updateAt(index, { imageUrls: next, imageUrl: next[0] ?? '' });
                              }}
                            >
                              删
                            </button>
                          ) : null}
                        </div>
                      ))}
                    </div>
                  ) : null}
                  <input
                    ref={(el) => {
                      fileRefs.current[index] = el;
                    }}
                    type="file"
                    accept="image/*"
                    multiple
                    hidden
                    disabled={disabled || filled.length >= STORE_PACKAGE_IMAGE_MAX_COUNT}
                    onChange={(e) => void pickPackageImages(index, e.target.files)}
                  />
                  <button
                    type="button"
                    className="shop-packages-add"
                    style={{ marginTop: 0 }}
                    disabled={disabled || uploadingIndex === index || filled.length >= STORE_PACKAGE_IMAGE_MAX_COUNT}
                    onClick={() => fileRefs.current[index]?.click()}
                  >
                    {uploadingIndex === index
                      ? '上传中…'
                      : `批量上传（${filled.length}/${STORE_PACKAGE_IMAGE_MAX_COUNT}）`}
                  </button>
                </div>

                <label className="shop-packages-field">
                  <span className="shop-packages-label">其他说明</span>
                  <textarea
                    className="shop-packages-input"
                    rows={2}
                    placeholder="不可叠加"
                    value={item.otherNotes || ''}
                    disabled={disabled}
                    onChange={(e) => updateAt(index, { otherNotes: e.target.value })}
                  />
                </label>
              </>
            ) : null}
          </section>
        );
      })}

      {!disabled && list.length < STORE_PACKAGE_MAX_COUNT ? (
        <button type="button" className="shop-packages-add" onClick={addItem}>
          <span className="material-symbols-outlined">add_circle</span>
          添加套餐
        </button>
      ) : null}
    </div>
  );
}