import type {
  ApiResponse,
  CompanyProfileDto,
  CompanyProfileInput,
  FileAttachmentDto,
  GanttLinkDto,
  GanttTaskDto,
  LoginRequest,
  LoginResponse,
} from "@mrp/shared";

export class ApiError extends Error {
  constructor(message: string, public readonly code: string) {
    super(message);
  }
}

async function request<T>(input: string, init?: RequestInit, token?: string): Promise<T> {
  const response = await fetch(input, {
    ...init,
    headers: {
      "Content-Type": "application/json",
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
      ...(init?.headers ?? {}),
    },
  });

  const json = (await response.json()) as ApiResponse<T>;
  if (!json.ok) {
    throw new ApiError(json.error.message, json.error.code);
  }

  return json.data;
}

export const api = {
  login(payload: LoginRequest) {
    return request<LoginResponse>("/api/v1/auth/login", {
      method: "POST",
      body: JSON.stringify(payload),
    });
  },
  me(token: string) {
    return request<LoginResponse["user"]>("/api/v1/auth/me", undefined, token);
  },
  getCompanyProfile(token: string) {
    return request<CompanyProfileDto>("/api/v1/company-profile", undefined, token);
  },
  updateCompanyProfile(token: string, payload: CompanyProfileInput) {
    return request<CompanyProfileDto>(
      "/api/v1/company-profile",
      {
        method: "PUT",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  async uploadFile(token: string, file: File, ownerType: string, ownerId: string) {
    const formData = new FormData();
    formData.append("file", file);
    formData.append("ownerType", ownerType);
    formData.append("ownerId", ownerId);

    const response = await fetch("/api/v1/files/upload", {
      method: "POST",
      headers: {
        Authorization: `Bearer ${token}`,
      },
      body: formData,
    });
    const json = (await response.json()) as ApiResponse<FileAttachmentDto>;
    if (!json.ok) {
      throw new ApiError(json.error.message, json.error.code);
    }
    return json.data;
  },
  getCustomers(token: string) {
    return request<Array<Record<string, string>>>("/api/v1/crm/customers", undefined, token);
  },
  getVendors(token: string) {
    return request<Array<Record<string, string>>>("/api/v1/crm/vendors", undefined, token);
  },
  getGanttDemo(token: string) {
    return request<{ tasks: GanttTaskDto[]; links: GanttLinkDto[] }>("/api/v1/gantt/demo", undefined, token);
  },
  async getCompanyProfilePreviewPdf(token: string) {
    const response = await fetch("/api/v1/documents/company-profile-preview.pdf", {
      headers: {
        Authorization: `Bearer ${token}`,
      },
    });

    if (!response.ok) {
      throw new ApiError("Unable to render company profile preview PDF.", "PDF_PREVIEW_FAILED");
    }

    return response.blob();
  },
};