import type {
  ApiResponse,
  CompanyProfileDto,
  CompanyProfileInput,
  FileAttachmentDto,
  GanttLinkDto,
  GanttTaskDto,
  LoginRequest,
  LoginResponse,
} from "@mrp/shared";
import type {
  CrmContactDto,
  CrmContactInput,
  CrmContactEntryDto,
  CrmContactEntryInput,
  CrmCustomerHierarchyOptionDto,
  CrmRecordDetailDto,
  CrmRecordInput,
  CrmRecordStatus,
  CrmRecordSummaryDto,
} from "@mrp/shared/dist/crm/types.js";

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;
}

function buildQueryString(params: Record<string, string | undefined>) {
  const searchParams = new URLSearchParams();
  for (const [key, value] of Object.entries(params)) {
    if (value) {
      searchParams.set(key, value);
    }
  }

  const queryString = searchParams.toString();
  return queryString ? `?${queryString}` : "";
}

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 ${token}`,
      },
      body: formData,
    });
    const json = (await response.json()) as ApiResponse<FileAttachmentDto>;
    if (!json.ok) {
      throw new ApiError(json.error.message, json.error.code);
    }
    return json.data;
  },
  async getFileContentBlob(token: string, fileId: string) {
    const response = await fetch(`/api/v1/files/${fileId}/content`, {
      headers: {
        Authorization: `Bearer ${token}`,
      },
    });

    if (!response.ok) {
      throw new ApiError("Unable to load file content.", "FILE_CONTENT_FAILED");
    }

    return response.blob();
  },
  getAttachments(token: string, ownerType: string, ownerId: string) {
    return request<FileAttachmentDto[]>(
      `/api/v1/files${buildQueryString({
        ownerType,
        ownerId,
      })}`,
      undefined,
      token
    );
  },
  getCustomers(token: string, filters?: { q?: string; status?: CrmRecordStatus; state?: string }) {
    return request<CrmRecordSummaryDto[]>(
      `/api/v1/crm/customers${buildQueryString({
        q: filters?.q,
        status: filters?.status,
        state: filters?.state,
      })}`,
      undefined,
      token
    );
  },
  getCustomer(token: string, customerId: string) {
    return request<CrmRecordDetailDto>(`/api/v1/crm/customers/${customerId}`, undefined, token);
  },
  getCustomerHierarchyOptions(token: string, excludeCustomerId?: string) {
    return request<CrmCustomerHierarchyOptionDto[]>(
      `/api/v1/crm/customers/hierarchy-options${buildQueryString({
        excludeCustomerId,
      })}`,
      undefined,
      token
    );
  },
  createCustomer(token: string, payload: CrmRecordInput) {
    return request<CrmRecordDetailDto>(
      "/api/v1/crm/customers",
      {
        method: "POST",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  updateCustomer(token: string, customerId: string, payload: CrmRecordInput) {
    return request<CrmRecordDetailDto>(
      `/api/v1/crm/customers/${customerId}`,
      {
        method: "PUT",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  createCustomerContactEntry(token: string, customerId: string, payload: CrmContactEntryInput) {
    return request<CrmContactEntryDto>(
      `/api/v1/crm/customers/${customerId}/contact-history`,
      {
        method: "POST",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  createCustomerContact(token: string, customerId: string, payload: CrmContactInput) {
    return request<CrmContactDto>(
      `/api/v1/crm/customers/${customerId}/contacts`,
      {
        method: "POST",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  getVendors(token: string, filters?: { q?: string; status?: CrmRecordStatus; state?: string }) {
    return request<CrmRecordSummaryDto[]>(
      `/api/v1/crm/vendors${buildQueryString({
        q: filters?.q,
        status: filters?.status,
        state: filters?.state,
      })}`,
      undefined,
      token
    );
  },
  getVendor(token: string, vendorId: string) {
    return request<CrmRecordDetailDto>(`/api/v1/crm/vendors/${vendorId}`, undefined, token);
  },
  createVendor(token: string, payload: CrmRecordInput) {
    return request<CrmRecordDetailDto>(
      "/api/v1/crm/vendors",
      {
        method: "POST",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  updateVendor(token: string, vendorId: string, payload: CrmRecordInput) {
    return request<CrmRecordDetailDto>(
      `/api/v1/crm/vendors/${vendorId}`,
      {
        method: "PUT",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  createVendorContactEntry(token: string, vendorId: string, payload: CrmContactEntryInput) {
    return request<CrmContactEntryDto>(
      `/api/v1/crm/vendors/${vendorId}/contact-history`,
      {
        method: "POST",
        body: JSON.stringify(payload),
      },
      token
    );
  },
  createVendorContact(token: string, vendorId: string, payload: CrmContactInput) {
    return request<CrmContactDto>(
      `/api/v1/crm/vendors/${vendorId}/contacts`,
      {
        method: "POST",
        body: JSON.stringify(payload),
      },
      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();
  },
};