// 比赛数据适配器：统一接口返回和比赛服 websocket 的字段结构。
// 页面继续使用原来的 camelCase 数据，后端可以返回 snake_case 或新的 matchInfo 包装结构。
export const MATCH_STATUS_BY_TEXT = {
  MATCH_STATUS_READY: 0,
  MATCH_STATUS_STARTED: 1,
  MATCH_STATUS_END: 2,
  MATCH_STATUS_TIMEOUT: 3,
  MATCH_STATUS_UNEXPECTEDLY: 4,
};

export function pickField(source, camelKey, snakeKey) {
  return source?.[camelKey] ?? source?.[snakeKey];
}

export function normalizeId(value) {
  if (value === undefined || value === null || value === "") return "";
  return String(value);
}

function toCamelKey(key) {
  return key.replace(/_([a-z0-9])/g, (_, character) => character.toUpperCase());
}

export function normalizePlainObject(value) {
  if (Array.isArray(value)) return value.map(normalizePlainObject);
  if (!value || typeof value !== "object") return value;

  return Object.keys(value).reduce((result, key) => {
    result[toCamelKey(key)] = normalizePlainObject(value[key]);
    return result;
  }, {});
}

function normalizeMapValues(map = {}) {
  return Object.keys(map || {}).reduce((result, key) => {
    result[key] = normalizePlainObject(map[key]);
    return result;
  }, {});
}

function normalizeShootListMap(map = {}) {
  return Object.keys(map || {}).reduce((result, key) => {
    const value = map[key];
    const items = Array.isArray(value)
      ? value
      : Array.isArray(value?.items)
      ? value.items
      : [];
    result[key] = items.map(normalizePlainObject);
    return result;
  }, {});
}

function normalizeRound(round = {}) {
  const normalized = normalizePlainObject(round);
  normalized.shoots = normalizeShootListMap(round.shoots || normalized.shoots);
  normalized.scores = normalizeMapValues(round.scores || normalized.scores);
  return normalized;
}

export function normalizeMatchInfo(matchInfo = {}) {
  if (!matchInfo || typeof matchInfo !== "object") return matchInfo;

  const normalized = normalizePlainObject(matchInfo);
  const statusText = normalized.statusText || matchInfo.status_text;

  if (
    (normalized.status === undefined ||
      normalized.status === null ||
      normalized.status === "") &&
    MATCH_STATUS_BY_TEXT[statusText] !== undefined
  ) {
    normalized.status = MATCH_STATUS_BY_TEXT[statusText];
  }

  if (matchInfo.teams || normalized.teams) {
    normalized.teams = normalizeMapValues(matchInfo.teams || normalized.teams);
  }
  if (Array.isArray(matchInfo.rounds || normalized.rounds)) {
    normalized.rounds = (matchInfo.rounds || normalized.rounds).map(normalizeRound);
  }
  if (matchInfo.current || normalized.current) {
    normalized.current = normalizePlainObject(matchInfo.current || normalized.current);
  }
  if (matchInfo.next || normalized.next) {
    normalized.next = normalizePlainObject(matchInfo.next || normalized.next);
  }
  if (matchInfo.shoot_data || normalized.shootData) {
    normalized.shootData = normalizePlainObject(matchInfo.shoot_data || normalized.shootData);
  }
  if (Array.isArray(matchInfo.result_list || normalized.resultList)) {
    normalized.resultList = (matchInfo.result_list || normalized.resultList).map(
      normalizePlainObject
    );
  }

  return normalized;
}

export function normalizeBattleApiResult(result) {
  if (!result || typeof result !== "object") return result;

  // request 通常已经解出顶层 data；这里额外兼容未解包和旧版扁平结构。
  const resultData = result.data && typeof result.data === "object" ? result.data : null;
  const payload =
    resultData && (resultData.matchInfo || resultData.match_info)
      ? resultData
      : result;
  const matchInfo = payload.matchInfo || payload.match_info || payload;
  const normalized = normalizeMatchInfo(matchInfo);
  const serverAddr =
    payload.serverAddr ||
    payload.server_addr ||
    matchInfo.serverAddr ||
    matchInfo.server_addr ||
    normalized.serverAddr;

  if (serverAddr) normalized.serverAddr = serverAddr;

  return normalized;
}