/**
 * 优化建议页面数据获取 Hook
 *
 * 封装建议列表的 SWR 请求 + 重新生成/更新状态的 mutation，替代手动 useState + useEffect 模式。
 * - 建议列表：依赖 brandId + 筛选条件
 * - 重新生成：mutation
 * - 更新状态：mutation
 */

import { useCallback } from "react";
import { useApi, useApiMutation } from "./use-api";
import { fetchWithAuth } from "@/lib/api/client";
import type { SWRConfiguration } from "swr";
import type { SuggestionListResponse, SuggestionStatus } from "@/types/suggestion";

export interface SuggestionsFilters {
  type?: string;
  priority?: string;
  status?: string;
}

export interface UseSuggestionsDataOptions {
  brandId?: string;
  filters?: SuggestionsFilters;
  /** SWR 配置（用于测试时禁用重试等） */
  swrOptions?: SWRConfiguration;
}

export interface UseSuggestionsDataReturn {
  /** 建议列表 */
  suggestions: SuggestionListResponse["suggestions"] | undefined;
  /** 是否正在加载 */
  isLoading: boolean;
  /** 错误信息 */
  error: Error | undefined;
  /** 刷新建议列表 */
  refresh: () => void;
  /** 重新生成建议 */
  regenerate: () => Promise<SuggestionListResponse | null>;
  /** 是否正在重新生成 */
  isRegenerating: boolean;
  /** 重新生成错误 */
  regenerateError: Error | undefined;
  /** 更新建议状态 */
  updateStatus: (suggestionId: string, newStatus: string) => Promise<void>;
  /** 是否正在更新状态 */
  isUpdatingStatus: boolean;
}

function buildSuggestionsUrl(brandId: string, filters?: SuggestionsFilters): string | null {
  if (!brandId) return null;

  const params = new URLSearchParams();
  if (filters?.type && filters.type !== "all") params.set("type", filters.type);
  if (filters?.priority && filters.priority !== "all") params.set("priority", filters.priority);
  if (filters?.status && filters.status !== "all") params.set("status", filters.status);

  const qs = params.toString();
  return `/api/v1/brands/${brandId}/suggestions${qs ? `?${qs}` : ""}`;
}

export function useSuggestionsData(
  options?: UseSuggestionsDataOptions
): UseSuggestionsDataReturn {
  const brandId = options?.brandId ?? "";
  const filters = options?.filters;
  const swrOptions = options?.swrOptions;

  // 建议列表
  const suggestionsUrl = buildSuggestionsUrl(brandId, filters);
  const {
    data: suggestionsResponse,
    isLoading,
    error,
    refresh,
    mutate,
  } = useApi<SuggestionListResponse>(suggestionsUrl, swrOptions);

  const suggestions = suggestionsResponse?.suggestions;

  // 重新生成建议（mutation）
  const {
    trigger: regenerateTrigger,
    isMutating: isRegenerating,
    error: regenerateError,
  } = useApiMutation<SuggestionListResponse>(
    brandId ? `/api/v1/brands/${brandId}/suggestions/regenerate` : "",
    "POST"
  );

  const regenerate = useCallback(async (): Promise<SuggestionListResponse | null> => {
    const result = await regenerateTrigger();
    if (result) {
      // 用新数据更新 SWR 缓存
      mutate(result);
    }
    return result;
  }, [regenerateTrigger, mutate]);

  // 更新建议状态（mutation）
  const {
    isMutating: isUpdatingStatus,
  } = useApiMutation(
    brandId ? `/api/v1/brands/${brandId}/suggestions` : "",
    "PUT"
  );

  const updateStatus = useCallback(
    async (suggestionId: string, newStatus: string) => {
      await fetchWithAuth(
        `/api/v1/brands/${brandId}/suggestions/${suggestionId}/status`,
        {
          method: "PUT",
          body: JSON.stringify({ status: newStatus }),
        }
      );
      // 乐观更新：直接修改本地缓存
      mutate(
        (current) => {
          if (!current) return current;
          return {
            ...current,
            suggestions: current.suggestions.map((s) =>
              s.id === suggestionId
                ? { ...s, status: newStatus as SuggestionStatus }
                : s
            ),
          };
        },
        { revalidate: false }
      );
    },
    [brandId, mutate]
  );

  return {
    suggestions,
    isLoading,
    error,
    refresh,
    regenerate,
    isRegenerating,
    regenerateError,
    updateStatus,
    isUpdatingStatus,
  };
}