import { HTTPError } from "ky";
import { API_PATHS } from "@/api/api-paths";
import { apiGet, apiPost, apiRequestRaw } from "@/api/api";
import { handleApiResponse } from "@/api/handle-api-response";
import {
  mapUpliftQueueExposureTotal,
  mapUpliftQueueItems,
  mapUpliftRequests,
} from "@/domain/uplifts/mappers/uplift-mapper";
import type { UpliftsQueueParams, UpliftsQueueResult } from "@/domain/uplifts/types/uplift";
import type { UpliftRequest } from "@/domain/uplifts/types/uplift";

function buildQueueParams(params: UpliftsQueueParams): Record<string, string | number> {
  const searchParams: Record<string, string | number> = {
    page: params.page ?? 1,
    pageSize: params.pageSize ?? 25,
  };
  if (params.status) searchParams.status = params.status;
  if (params.tier) searchParams.tier = params.tier;
  return searchParams;
}

function evidenceUrl(id: string | number): string {
  return `${API_PATHS.rest.uplifts}/${id}/evidence`;
}

function readContentDispositionFilename(response: Response, fallback: string): string {
  const disposition = response.headers.get("Content-Disposition") ?? "";
  const match = /filename="?([^";]+)"?/i.exec(disposition);
  return match ? match[1] : fallback;
}

function evidenceHttpError(status: number): Error {
  if (status === 423) {
    return new Error("Evidence is still being scanned. Try again shortly.");
  }
  if (status === 403) {
    return new Error("You are not authorized to view this evidence.");
  }
  return new Error("Unable to download evidence right now.");
}

export const upliftsApi = {
  list: async (params: UpliftsQueueParams = {}): Promise<UpliftsQueueResult> => {
    const data = await apiGet<unknown>(API_PATHS.rest.uplifts, {
      searchParams: buildQueueParams(params),
    });
    const response = handleApiResponse<Record<string, unknown>>(data);
    const items = Array.isArray(response?.items)
      ? response.items
      : Array.isArray((response as { data?: unknown[] })?.data)
        ? (response as { data: unknown[] }).data
        : [];
    const total =
      (typeof response?.total === "number" ? response.total : undefined) ??
      (typeof response?.totalCount === "number" ? response.totalCount : undefined) ??
      items.length;

    return {
      items: mapUpliftQueueItems(items),
      totalCount: total,
      page: params.page ?? 1,
      pageSize: params.pageSize ?? 25,
      pendingExposureTotal: mapUpliftQueueExposureTotal(response),
    };
  },

  listForDispatch: async (dispatchId: string | number): Promise<UpliftRequest[]> => {
    const data = await apiGet<unknown>(`${API_PATHS.rest.uplifts}/dispatch/${dispatchId}`);
    const response = handleApiResponse<unknown>(data);
    const items = Array.isArray(response)
      ? response
      : typeof response === "object" &&
          response !== null &&
          Array.isArray((response as { data?: unknown[] }).data)
        ? (response as { data: unknown[] }).data
        : [];
    return mapUpliftRequests(items);
  },

  approve: async (id: string | number, note?: string): Promise<void> => {
    await apiPost<unknown>(`${API_PATHS.rest.uplifts}/${id}/approve`, { note });
  },

  reject: async (id: string | number, note: string): Promise<void> => {
    await apiPost<unknown>(`${API_PATHS.rest.uplifts}/${id}/reject`, { note });
  },

  requestChanges: async (id: string | number, note: string): Promise<void> => {
    await apiPost<unknown>(`${API_PATHS.rest.uplifts}/${id}/request-changes`, { note });
  },

  revoke: async (id: string | number, reason: string): Promise<void> => {
    await apiPost<unknown>(`${API_PATHS.rest.uplifts}/${id}/revoke`, { note: reason });
  },

  downloadEvidence: async (
    id: string | number,
    fallbackFileName = "uplift-evidence",
  ): Promise<void> => {
    let response: Response;
    try {
      response = await apiRequestRaw(
        "get",
        evidenceUrl(id),
        undefined,
        "upliftsApi.downloadEvidence",
      );
    } catch (error) {
      if (error instanceof HTTPError) {
        throw evidenceHttpError(error.response.status);
      }
      throw error;
    }

    const blob = await response.blob();
    const fileName = readContentDispositionFilename(response, fallbackFileName);
    const url = URL.createObjectURL(blob);
    const anchor = window.document.createElement("a");
    anchor.href = url;
    anchor.download = fileName;
    anchor.click();
    URL.revokeObjectURL(url);
  },
};