import { normalizeRateDisplay } from "../../shared/rate-normalizer";
import type { MarketApiResult } from "./types";

interface FetchResponseLike {
  json(): Promise<unknown>;
  ok: boolean;
  status?: number;
}

type FetchLike = (
  input: string,
  init?: RequestInit
) => Promise<FetchResponseLike>;

interface MarketApiClientOptions {
  baseUrl?: string;
  fetchImpl?: FetchLike;
  timeoutMs?: number;
}

export function createMarketApiClient(options: MarketApiClientOptions = {}) {
  const baseUrl = options.baseUrl ?? resolveBaseUrl();
  const fetchImpl = options.fetchImpl ?? defaultFetch;
  const timeoutMs = options.timeoutMs ?? 8000;

  return {
    async loadAuthorAseInfo(authorId: string): Promise<MarketApiResult> {
      const primaryResult = await loadAuthorMetricsFromUrl(
        buildAuthorCommerceSeedBaseInfoUrl(authorId, baseUrl)
      );
      if (primaryResult.success || primaryResult.reason === "timeout") {
        return primaryResult;
      }

      return loadAuthorMetricsFromUrl(buildAuthorAseInfoUrl(authorId, baseUrl));
    }
  };

  async function loadAuthorMetricsFromUrl(url: string): Promise<MarketApiResult> {
    const controller = new AbortController();
    const timeoutId = setTimeout(() => controller.abort(), timeoutMs);

    try {
      const response = await fetchImpl(url, {
        credentials: "include",
        method: "GET",
        signal: controller.signal
      });

      if (!response.ok) {
        return {
          success: false,
          reason: "request-failed"
        };
      }

      return mapAuthorAseInfoResponse(await response.json());
    } catch (error) {
      if (isAbortError(error) || controller.signal.aborted) {
        return {
          success: false,
          reason: "timeout"
        };
      }

      return {
        success: false,
        reason: "request-failed"
      };
    } finally {
      clearTimeout(timeoutId);
    }
  }
}

export function buildAuthorAseInfoUrl(authorId: string, baseUrl: string): string {
  const url = new URL("/gw/api/aggregator/get_author_ase_info", baseUrl);
  url.searchParams.set("author_id", authorId);
  url.searchParams.set("range", "30");
  return url.toString();
}

export function buildAuthorCommerceSeedBaseInfoUrl(
  authorId: string,
  baseUrl: string
): string {
  const url = new URL(
    "/gw/api/aggregator/get_author_commerce_seed_base_info",
    baseUrl
  );
  url.searchParams.set("o_author_id", authorId);
  url.searchParams.set("range", "90");
  return url.toString();
}

export function mapAuthorAseInfoResponse(payload: unknown): MarketApiResult {
  const data = getPayloadData(payload);
  if (!data) {
    return {
      success: false,
      reason: "bad-response"
    };
  }

  const singleVideoAfterSearchRate = readNormalizedRate(
    data.avg_search_after_view_rate
  );
  const personalVideoAfterSearchRate = readNormalizedRate(
    data.personal_avg_search_after_view_rate
  );

  if (!singleVideoAfterSearchRate && !personalVideoAfterSearchRate) {
    return {
      success: false,
      reason: "missing-rate"
    };
  }

  return {
    success: true,
    rates: {
      ...(singleVideoAfterSearchRate ? { singleVideoAfterSearchRate } : {}),
      ...(personalVideoAfterSearchRate ? { personalVideoAfterSearchRate } : {})
    }
  };
}

function getPayloadData(payload: unknown): Record<string, unknown> | null {
  if (!isRecord(payload)) {
    return null;
  }

  return isRecord(payload.data) ? payload.data : payload;
}

function readNormalizedRate(value: unknown): string | null {
  return typeof value === "string" ? normalizeRateDisplay(value) : null;
}

function resolveBaseUrl(): string {
  if (typeof location !== "undefined" && location.origin) {
    return location.origin;
  }

  return "https://xingtu.cn";
}

async function defaultFetch(input: string, init?: RequestInit) {
  return fetch(input, init);
}

function isAbortError(error: unknown): boolean {
  return error instanceof Error && error.name === "AbortError";
}

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null;
}