/**
 * MotherShip 官网 Widget 档位注册表
 *
 * 原则：官网/API 返回什么档位，宿主就展示什么——展示层不隐藏、不合成新档位。
 * 本文件仅负责：中文标签、Tab 排序、去重、service_level 规范化。
 */

export type QuoteTierKey = {
  service_level: string;
  rate_option: string;
};

export type MotherShipUiTabConfig = {
  /** axel rates 顶层键，如 standard / guaranteed / dedicated */
  serviceLevel: string;
  labelZh: string;
  sortOrder: number;
  /**
   * 该 Tab 下子选项的官网展示顺序（仅排序；不用于过滤 API 档位）。
   */
  visibleRateOptions: readonly string[];
  /** @deprecated 不再用于过滤或顶替展示 */
  preferBestValueOverLowest?: boolean;
};

/** 已知 Tab；未来 MotherShip 新增 Tab 时在此追加 */
export const MOTHERSHIP_UI_TAB_REGISTRY: readonly MotherShipUiTabConfig[] = [
  {
    serviceLevel: "standard",
    labelZh: "标准",
    sortOrder: 0,
    visibleRateOptions: ["lowest", "fastest", "bestValue"],
    preferBestValueOverLowest: true,
  },
  {
    serviceLevel: "guaranteed",
    labelZh: "保证送达",
    sortOrder: 1,
    visibleRateOptions: ["lowest", "fastest", "bestValue"],
  },
  {
    serviceLevel: "dedicated",
    labelZh: "专属卡车",
    sortOrder: 2,
    visibleRateOptions: ["bestValue", "lowest", "fastest"],
  },
] as const;

const REGISTRY_BY_LEVEL = new Map(
  MOTHERSHIP_UI_TAB_REGISTRY.map((t) => [t.serviceLevel, t]),
);

const SERVICE_LEVEL_ALIASES: Record<string, string> = {
  standard: "standard",
  guaranteed: "guaranteed",
  guarantee: "guaranteed",
  dedicated: "dedicated",
  dedicatedtruck: "dedicated",
  truckload: "dedicated",
  fulltruckload: "dedicated",
  ftl: "dedicated",
  标准: "standard",
  保证送达: "guaranteed",
  专属卡车: "dedicated",
  专属货车: "dedicated",
};

const RATE_OPTION_ALIASES: Record<string, string> = {
  lowest: "lowest",
  cheapest: "lowest",
  fastest: "fastest",
  expedited: "fastest",
  bestvalue: "bestValue",
  最低价格: "lowest",
  最快递送: "fastest",
  最优性价比: "bestValue",
};

const RATE_OPTION_LABEL_ZH: Record<string, string> = {
  lowest: "最低价格",
  fastest: "最快递送",
  bestValue: "最优性价比",
};

const RATE_OPTION_SORT = new Map(
  ["lowest", "bestValue", "fastest"].map((k, i) => [k, i]),
);

/** axel rates 顶层键 → 规范 service_level（未知键原样保留，便于前向兼容） */
export function normalizeMotherShipServiceLevel(raw: string): string {
  const key = raw.replace(/[^a-z0-9\u4e00-\u9fff]/gi, "").toLowerCase();
  return SERVICE_LEVEL_ALIASES[key] ?? raw.trim().toLowerCase();
}

/** 子键 / serviceType → 规范 rate_option */
export function normalizeMotherShipRateOption(raw: string): string | null {
  const key = raw.replace(/[^a-z0-9\u4e00-\u9fff]/gi, "").toLowerCase();
  return RATE_OPTION_ALIASES[key] ?? null;
}

/** 官网 Tab 中文名；未知档位用友好 fallback */
export function getMotherShipServiceLevelLabel(serviceLevel: string): string {
  const normalized = normalizeMotherShipServiceLevel(serviceLevel);
  const known = REGISTRY_BY_LEVEL.get(normalized);
  if (known) {
    return known.labelZh;
  }
  if (!normalized) {
    return "其它运价";
  }
  return normalized.charAt(0).toUpperCase() + normalized.slice(1);
}

/** 官网子选项中文名 */
export function getMotherShipRateOptionLabel(
  serviceLevel: string,
  rateOption: string,
): string {
  return RATE_OPTION_LABEL_ZH[rateOption] ?? rateOption;
}

export function getMotherShipUiTabConfig(
  serviceLevel: string,
): MotherShipUiTabConfig | undefined {
  return REGISTRY_BY_LEVEL.get(normalizeMotherShipServiceLevel(serviceLevel));
}

function compareRateOption(a: string, b: string): number {
  return (
    (RATE_OPTION_SORT.get(a) ?? 99) - (RATE_OPTION_SORT.get(b) ?? 99)
  );
}

export function compareMotherShipUiTierSortOrder(
  levelA: string,
  rateA: string,
  levelB: string,
  rateB: string,
): number {
  const tabA = getMotherShipUiTabConfig(levelA);
  const tabB = getMotherShipUiTabConfig(levelB);
  const orderA = tabA?.sortOrder ?? 100 + levelA.charCodeAt(0);
  const orderB = tabB?.sortOrder ?? 100 + levelB.charCodeAt(0);
  if (orderA !== orderB) {
    return orderA - orderB;
  }
  const visA = tabA?.visibleRateOptions ?? [];
  const visB = tabB?.visibleRateOptions ?? [];
  const idxA = visA.indexOf(rateA);
  const idxB = visB.indexOf(rateB);
  if (idxA >= 0 || idxB >= 0) {
    return (idxA >= 0 ? idxA : 99) - (idxB >= 0 ? idxB : 99);
  }
  return compareRateOption(rateA, rateB);
}

function sortRateOptionsForTab(
  serviceLevel: string,
  options: string[],
): string[] {
  const tab = REGISTRY_BY_LEVEL.get(normalizeMotherShipServiceLevel(serviceLevel));
  if (!tab) {
    return [...options].sort(compareRateOption);
  }
  const order = new Map(tab.visibleRateOptions.map((ro, i) => [ro, i]));
  return [...options].sort(
    (a, b) => (order.get(a) ?? 99) - (order.get(b) ?? 99) || compareRateOption(a, b),
  );
}

/**
 * 展示用报价列表：去重 + 规范化 service_level + 按官网 Tab 顺序排序（不删档、不补档）
 */
export function filterQuotesForMotherShipUiDisplay<T extends QuoteTierKey>(
  quotes: T[],
): T[] {
  const structured = quotes.filter((q) => q.service_level && q.rate_option);
  if (structured.length === 0 && quotes.length > 0) {
    return quotes;
  }

  const deduped = new Map<string, T>();
  for (const q of structured) {
    const level = normalizeMotherShipServiceLevel(q.service_level);
    deduped.set(`${level}/${q.rate_option}`, { ...q, service_level: level });
  }

  return [...deduped.values()].sort((a, b) =>
    compareMotherShipUiTierSortOrder(
      a.service_level,
      a.rate_option,
      b.service_level,
      b.rate_option,
    ),
  );
}

/** 从报价列表推导应展示的 Tab（按注册表顺序，含未来未知 Tab） */
export function listMotherShipUiTabsFromQuotes<T extends QuoteTierKey>(
  quotes: T[],
): string[] {
  const levels = new Set(
    quotes.map((q) => normalizeMotherShipServiceLevel(q.service_level)),
  );
  const ordered: string[] = [];
  for (const tab of MOTHERSHIP_UI_TAB_REGISTRY) {
    if (levels.has(tab.serviceLevel)) {
      ordered.push(tab.serviceLevel);
      levels.delete(tab.serviceLevel);
    }
  }
  for (const rest of [...levels].sort()) {
    ordered.push(rest);
  }
  return ordered;
}

/** 某 Tab 下实际存在的 rate_option（按官网顺序排列，不过滤） */
export function listVisibleRateOptionsForTab<T extends QuoteTierKey>(
  quotes: T[],
  serviceLevel: string,
): string[] {
  const level = normalizeMotherShipServiceLevel(serviceLevel);
  const present = [
    ...new Set(
      quotes
        .filter((q) => normalizeMotherShipServiceLevel(q.service_level) === level)
        .map((q) => q.rate_option),
    ),
  ];
  return sortRateOptionsForTab(level, present);
}

/** 某 Tab 下默认选中的 rate_option（与官网默认「最低价格」一致） */
export function resolveDefaultRateOptionForTab<T extends QuoteTierKey>(
  quotes: T[],
  serviceLevel: string,
): string {
  const options = listVisibleRateOptionsForTab(quotes, serviceLevel);
  if (options.includes("lowest")) {
    return "lowest";
  }
  if (options.includes("bestValue")) {
    return "bestValue";
  }
  return options[0] ?? "lowest";
}

/** axel rates 顶层键中识别 service level（跳过 fastest 顶层槽） */
export function listServiceLevelsFromRatesBlock(
  rates: Record<string, unknown>,
): string[] {
  const skip = new Set(["fastest"]);
  const levels: string[] = [];
  for (const key of Object.keys(rates)) {
    if (skip.has(key)) {
      continue;
    }
    const normalized = normalizeMotherShipServiceLevel(key);
    if (normalized && !levels.includes(normalized)) {
      levels.push(normalized);
    }
  }
  return levels;
}