import type {
  AgentCategory,
  AgentCategoryCreatePayload,
  AgentCreatePayload,
  AgentPreset,
  AgentPresetListResponse,
  AgentUpdatePayload,
} from "@/types/agent";

interface ApiResponse<T = any> {
  success: boolean;
  data?: T;
  error?: string;
}

async function parseJsonSafely<T>(response: Response): Promise<T | null> {
  try {
    return (await response.json()) as T;
  } catch (_error) {
    return null;
  }
}

export const agentCategoryService = {
  async getCategories(scope: "all" | "public" | "private" = "public"): Promise<ApiResponse<AgentCategory[]>> {
    try {
      const response = await fetch(`/api/agent-categories?scope=${scope}`, {
        cache: "no-store",
      });
      const data = await parseJsonSafely<ApiResponse<AgentCategory[]>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "获取风格化分类失败" };
      }
      return data || { success: false, error: "获取风格化分类失败" };
    } catch (_error) {
      return { success: false, error: "获取风格化分类失败" };
    }
  },

  async createCategory(payload: AgentCategoryCreatePayload): Promise<ApiResponse<AgentCategory>> {
    try {
      const response = await fetch("/api/agent-categories", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(payload),
      });
      const data = await parseJsonSafely<ApiResponse<AgentCategory>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "创建风格化分类失败" };
      }
      return data || { success: false, error: "创建风格化分类失败" };
    } catch (_error) {
      return { success: false, error: "创建风格化分类失败" };
    }
  },
};

export const agentService = {
  async getPresets(params?: {
    scope?: "all" | "public" | "private";
    type?: "image" | "video";
    categoryId?: string;
    keyword?: string;
    sort?: "latest" | "hottest" | "most_used";
  }): Promise<ApiResponse<AgentPresetListResponse>> {
    try {
      const searchParams = new URLSearchParams();
      if (params?.scope) searchParams.set("scope", params.scope);
      if (params?.type) searchParams.set("type", params.type);
      if (params?.categoryId) searchParams.set("categoryId", params.categoryId);
      if (params?.keyword) searchParams.set("keyword", params.keyword);
      if (params?.sort) searchParams.set("sort", params.sort);
      const query = searchParams.toString();
      const response = await fetch(`/api/agents${query ? `?${query}` : ""}`, {
        cache: "no-store",
      });
      const data = await parseJsonSafely<ApiResponse<AgentPresetListResponse>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "获取风格化列表失败" };
      }
      return data || { success: false, error: "获取风格化列表失败" };
    } catch (_error) {
      return { success: false, error: "获取风格化列表失败" };
    }
  },

  async getPreset(id: string): Promise<ApiResponse<AgentPreset>> {
    try {
      const response = await fetch(`/api/agents/${id}`, { cache: "no-store" });
      const data = await parseJsonSafely<ApiResponse<AgentPreset>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "获取风格化失败" };
      }
      return data || { success: false, error: "获取风格化失败" };
    } catch (_error) {
      return { success: false, error: "获取风格化失败" };
    }
  },

  async createPreset(payload: AgentCreatePayload): Promise<ApiResponse<AgentPreset>> {
    try {
      const response = await fetch("/api/agents", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(payload),
      });
      const data = await parseJsonSafely<ApiResponse<AgentPreset>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "创建风格化失败" };
      }
      return data || { success: false, error: "创建风格化失败" };
    } catch (_error) {
      return { success: false, error: "创建风格化失败" };
    }
  },

  async updatePreset(id: string, payload: AgentUpdatePayload): Promise<ApiResponse<AgentPreset>> {
    try {
      const response = await fetch(`/api/agents/${id}`, {
        method: "PUT",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(payload),
      });
      const data = await parseJsonSafely<ApiResponse<AgentPreset>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "更新风格化失败" };
      }
      return data || { success: false, error: "更新风格化失败" };
    } catch (_error) {
      return { success: false, error: "更新风格化失败" };
    }
  },

  async deletePreset(id: string): Promise<ApiResponse<AgentPreset>> {
    try {
      const response = await fetch(`/api/agents/${id}`, {
        method: "DELETE",
      });
      const data = await parseJsonSafely<ApiResponse<AgentPreset>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "删除风格化失败" };
      }
      return data || { success: false, error: "删除风格化失败" };
    } catch (_error) {
      return { success: false, error: "删除风格化失败" };
    }
  },

  async forkPreset(id: string, name?: string): Promise<ApiResponse<AgentPreset>> {
    try {
      const response = await fetch(`/api/agents/${id}/fork`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(name ? { name } : {}),
      });
      const data = await parseJsonSafely<ApiResponse<AgentPreset>>(response);
      if (!response.ok) {
        return { success: false, error: data?.error || "复制风格化失败" };
      }
      return data || { success: false, error: "复制风格化失败" };
    } catch (_error) {
      return { success: false, error: "复制风格化失败" };
    }
  },
};

export default {
  preset: agentService,
  category: agentCategoryService,
};