/**
 * 后端 HTTP 客户端 —— 仅 background 使用（有 host_permissions，不受 CORS 约束）。
 * 契约对齐 server 端 /api/materials（见 docs/v2/api.md）。
 */
import type { ScanResult } from '../collector/scan';
import type { TextEdits } from '../export/builder';

export interface MaterialsPayload {
  product_id: string | null;
  source: {
    platform: string;
    itemId: string | null;
    url: string;
    collectedAt: number;
  };
  texts: Array<{ kind: string; content: string; pairs?: Array<{ key: string; value: string }> | null }>;
  images: Array<{
    groupKey: string;
    groupName: string;
    variantName?: string | null;
    url: string;
    index: number;
    type: string;
    dedupeKey?: string | null;
  }>;
  refererOrigin?: string;
}

/** 用（可能已二次修改的）文本 + 已勾选图片，组装 /api/materials 请求体 */
export function buildMaterialsPayload(
  result: ScanResult,
  selectedKeys: Set<string>,
  edits?: TextEdits,
): MaterialsPayload {
  const text = (kind: string) => result.texts.find((t) => t.kind === kind)?.content ?? '';

  const title = edits?.title ?? text('title');
  const price = edits?.price ?? text('price');
  const brand = edits?.brand ?? text('brand');
  const desc = edits?.desc ?? text('desc');
  const sellingPoints = edits?.sellingPoints ?? text('selling_point');
  const params: Array<{ key: string; value: string }> = [
    ...(edits?.params ?? result.texts.find((t) => t.kind === 'params')?.pairs ?? []),
  ];
  // 包装重量 / 包装尺寸合并进参数（后端存到 raw.params，studio 里再映射为 Ozon 字段）
  if (edits?.weight) params.push({ key: '包装重量', value: edits.weight });
  const dimSuffix = edits?.dimsUnit === 'mm' ? ' mm' : ' cm';
  if (edits?.dims?.l) params.push({ key: '包装长度', value: `${edits.dims.l}${dimSuffix}` });
  if (edits?.dims?.w) params.push({ key: '包装宽度', value: `${edits.dims.w}${dimSuffix}` });
  if (edits?.dims?.h) params.push({ key: '包装高度', value: `${edits.dims.h}${dimSuffix}` });

  const texts: MaterialsPayload['texts'] = [];
  if (title) texts.push({ kind: 'title', content: title });
  if (price) texts.push({ kind: 'price', content: price });
  if (brand) texts.push({ kind: 'brand', content: brand });
  if (params.length) texts.push({ kind: 'params', content: '', pairs: params });
  if (sellingPoints) texts.push({ kind: 'selling_point', content: sellingPoints });
  if (desc) texts.push({ kind: 'desc', content: desc });

  const images = result.images
    .filter((img) => selectedKeys.has(img.key))
    .map((img) => ({
      groupKey: img.groupKey,
      groupName: img.groupName,
      variantName: img.variantName ?? null,
      url: img.url,
      index: img.index,
      type: img.type,
      dedupeKey: img.url,
    }));

  return {
    product_id: null,
    source: {
      platform: result.platform,
      itemId: result.itemId,
      url: result.url,
      collectedAt: result.scannedAt,
    },
    texts,
    images,
    refererOrigin: 'https://www.ozon.ru',
  };
}

export async function uploadMaterials(
  baseUrl: string,
  token: string,
  payload: MaterialsPayload,
): Promise<{ product_id: string; stage: string; assets_queued: number }> {
  const headers: Record<string, string> = { 'Content-Type': 'application/json' };
  if (token) headers.Authorization = `Bearer ${token}`; // 单用户宽松模式：token 可空

  const res = await fetch(`${baseUrl.replace(/\/$/, '')}/api/materials`, {
    method: 'POST',
    headers,
    body: JSON.stringify(payload),
  });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) {
    throw new Error(data?.detail || `上传失败 HTTP ${res.status}`);
  }
  return data;
}