/**
 * Flock fill-only 结账进度（Redis）
 */
import { withBoundedRedis } from "@/lib/redis";
import type { FlockCheckoutTier } from "@/lib/flock/flock-checkout-selection";

export type FlockCheckoutStatusPayload = {
  quote_id: string;
  status: "processing" | "done" | "failed";
  stage?: string | null;
  preferred_tier?: FlockCheckoutTier | null;
  selected_total?: number | null;
  message?: string | null;
  /** 仅服务端日志/诊断，不对前端暴露 */
  screenshot_path?: string | null;
  updated_at_ms: number;
};

/** GET 报价附加字段：脱敏 */
export type FlockCheckoutPublic = {
  status: "processing" | "done" | "failed";
  stage?: string | null;
  preferred_tier?: FlockCheckoutTier | null;
  selected_total?: number | null;
  message?: string | null;
};

const PREFIX = "flock_checkout:";
const TTL_SEC = 30 * 60;

const SAFE_DONE_MSG = "已在官网填齐详情（未支付）";
const SAFE_FAIL_MSG = "官网同步失败，请稍后重试";
const SAFE_PROCESSING_MSG = "正在官网选择报价档并填齐详情…";

function key(quoteId: string): string {
  return `${PREFIX}${quoteId}`;
}

export function toFlockCheckoutPublic(
  payload: FlockCheckoutStatusPayload,
): FlockCheckoutPublic {
  let message = payload.message ?? null;
  if (payload.status === "failed") {
    message = SAFE_FAIL_MSG;
  } else if (payload.status === "done") {
    message = SAFE_DONE_MSG;
  } else if (payload.status === "processing") {
    message = SAFE_PROCESSING_MSG;
  }
  return {
    status: payload.status,
    stage: payload.stage ?? null,
    preferred_tier: payload.preferred_tier ?? null,
    selected_total: payload.selected_total ?? null,
    message,
  };
}

export async function saveFlockCheckoutStatus(
  payload: FlockCheckoutStatusPayload,
): Promise<void> {
  const ok = await withBoundedRedis((redis) =>
    redis.setex(key(payload.quote_id), TTL_SEC, JSON.stringify(payload)),
  );
  if (ok === null) {
    console.warn("[flock-checkout] save skipped: Redis 不可达");
  }
}

export async function readFlockCheckoutStatus(
  quoteId: string,
): Promise<FlockCheckoutStatusPayload | null> {
  const raw = await withBoundedRedis((redis) => redis.get(key(quoteId)));
  if (!raw) return null;
  try {
    return JSON.parse(raw) as FlockCheckoutStatusPayload;
  } catch {
    return null;
  }
}