import type { GenerationJob } from "@/lib/types";

export type ProviderErrorDiagnostic = {
  status?: number;
  code?: string;
  requestId?: string;
  detail?: string;
  phase?: "submit" | "query";
  kind?: string;
};

const unknownSubmission = "provider submission outcome is unknown; refusing duplicate submission";

function nonemptyString(value: unknown): string | undefined {
  return typeof value === "string" && value.trim() ? value.trim() : undefined;
}

export function providerErrorDiagnostic(job: GenerationJob): ProviderErrorDiagnostic | null {
  const value = job.responsePayload?.providerError;
  if (!value || typeof value !== "object" || Array.isArray(value)) {
    const legacyCode = job.error?.code;
    if (typeof legacyCode === "string" && /^[A-Za-z0-9_.:-]{1,160}$/.test(legacyCode)) return { code: legacyCode };
    if (typeof legacyCode === "number" && Number.isSafeInteger(legacyCode)) return { code: String(legacyCode) };
    return null;
  }
  const source = value as Record<string, unknown>;
  const status = typeof source.status === "number" && Number.isInteger(source.status) && source.status >= 100 && source.status <= 599
    ? source.status : undefined;
  const phase = source.phase === "submit" || source.phase === "query" ? source.phase : undefined;
  const diagnostic: ProviderErrorDiagnostic = {
    status,
    code: nonemptyString(source.code),
    requestId: nonemptyString(source.requestId),
    detail: nonemptyString(source.detail),
    phase,
    kind: nonemptyString(source.kind)
  };
  return Object.values(diagnostic).some((item) => item !== undefined) ? diagnostic : null;
}

export function generationErrorMessage(job: GenerationJob): string {
  const message = job.error?.message?.trim();
  const providerCode = providerErrorDiagnostic(job)?.code || job.error?.code;
  if (providerCode === "InputImageSensitiveContentDetected.PrivacyInformation" &&
      (!message || message === unknownSubmission)) {
    return "参考图片涉及真人肖像，未通过服务商审核。请更换符合服务商要求的素材后重试。";
  }
  if (message === unknownSubmission) {
    return "暂时无法确认服务商是否已接收本次请求，为避免重复生成和扣费，平台已停止自动重试。请联系管理员核查任务状态。";
  }
  return message || "生成失败，服务商未提供具体原因，请联系管理员。";
}