import { normalizeToFourTiers } from "@/modules/quote/quote-completeness";
import type { QuoteItem } from "@/modules/providers/quote-provider";

const CORE_TIER_KEYS = [
  "standard/lowest",
  "standard/fastest",
  "guaranteed/lowest",
  "guaranteed/fastest",
] as const;

const OPTIONAL_TIER_KEYS = [
  "standard/bestValue",
  "guaranteed/bestValue",
] as const;

export type ProbeValidationResult =
  | { ok: true }
  | { ok: false; message: string };

function resolveProbeItem(
  map: Map<string, QuoteItem>,
  key: string,
): QuoteItem | undefined {
  const direct = map.get(key);
  if (direct) {
    return direct;
  }
  if (key.endsWith("/fastest")) {
    return map.get(key.replace("/fastest", "/lowest"));
  }
  return undefined;
}

/** TC-601：至少 standard/guaranteed lowest；缺失 fastest 可复用 lowest */
export function validateProbeItems(
  items: QuoteItem[],
): ProbeValidationResult {
  const map = new Map<string, QuoteItem>();
  for (const item of items) {
    map.set(`${item.serviceLevel}/${item.rateOption}`, item);
  }

  try {
    normalizeToFourTiers(
      items.map((item) => ({
        service_level: item.serviceLevel,
        rate_option: item.rateOption,
      })),
    );
  } catch (error) {
    return {
      ok: false,
      message: error instanceof Error ? error.message : "档位不足",
    };
  }

  for (const key of CORE_TIER_KEYS) {
    const item = resolveProbeItem(map, key);
    if (!item) {
      return { ok: false, message: `缺少档位 ${key}` };
    }
    if (item.rawFreight <= 0) {
      return {
        ok: false,
        message: `档位 ${key} rawFreight 无效`,
      };
    }
    if (!item.transitDescription?.trim()) {
      return {
        ok: false,
        message: `档位 ${key} transit_description 为空`,
      };
    }
  }

  for (const key of OPTIONAL_TIER_KEYS) {
    const item = map.get(key);
    if (!item) {
      continue;
    }
    if (item.rawFreight <= 0) {
      return {
        ok: false,
        message: `档位 ${key} rawFreight 无效`,
      };
    }
    if (!item.transitDescription?.trim()) {
      return {
        ok: false,
        message: `档位 ${key} transit_description 为空`,
      };
    }
  }

  return { ok: true };
}