const { API } = require('./constants');
const { request } = require('./http');
const { normalizeCheckinProgress } = require('./checkin-progress');

function fetchScoreEvents() {
  return request({ path: API.scoreEvents, method: 'GET', needAuth: false });
}

function fetchScoreFilters(eventId) {
  return request({ path: API.scoreFilters, method: 'GET', data: { eventId }, needAuth: false });
}

function queryScores({ eventId, projectId, groupName, keyword } = {}) {
  return request({ path: API.scoreQuery, method: 'GET', data: { eventId, projectId, groupName, keyword }, needAuth: false });
}

function isEmptyValue(value) {
  return value === undefined || value === null || value === '';
}

// 参数校验一律以 reject 返回，不能同步 throw：
// 调用方普遍写成 fn().then().catch().finally()，同步抛出会绕过 catch/finally，
// 造成 loading 遮罩不消失、按钮 loading 锁死。
function rejectWith(message) {
  return Promise.reject(new Error(message));
}

function withProjectScope(data, eventProjectId) {
  if (!isEmptyValue(eventProjectId)) data.eventProjectId = eventProjectId;
  return data;
}

function fetchCurrentCheckin({ eventProjectId } = {}) {
  return request({ path: API.checkinContext, method: 'GET', data: withProjectScope({}, eventProjectId), needAuth: true });
}

function updateCheckinStatus({ unitKey, eventProjectId, checked }) {
  return request({ path: API.checkinStatus, method: 'POST', data: withProjectScope({ unitKey, checked }, eventProjectId), needAuth: true });
}

function startCheckin({ eventProjectId } = {}) {
  if (isEmptyValue(eventProjectId)) return rejectWith('请选择检录项目');
  return request({
    path: API.checkinStart,
    method: 'POST',
    data: { eventProjectId },
    needAuth: true
  });
}

function scanCheckin({ code, eventProjectId } = {}) {
  if (isEmptyValue(code)) return rejectWith('未识别到有效检录码');
  const normalizedCode = String(code).trim();
  if (!normalizedCode) return rejectWith('未识别到有效检录码');
  return request({
    path: API.checkinScan,
    method: 'POST',
    data: withProjectScope({ code: normalizedCode }, eventProjectId),
    needAuth: true
  });
}

function markCheckinOnStage({ unitKey, eventProjectId } = {}) {
  if (isEmptyValue(unitKey)) return rejectWith('缺少参赛单位标识');
  return request({
    path: API.checkinOnStage,
    method: 'POST',
    data: withProjectScope({ unitKey }, eventProjectId),
    needAuth: true
  });
}

function fetchCheckinProgress(eventId) {
  if (isEmptyValue(eventId)) return rejectWith('缺少赛事ID');
  return request({ path: API.checkinProgress, method: 'GET', data: { eventId }, needAuth: true })
    .then(normalizeCheckinProgress);
}

function fetchRefereeProfileOptions() {
  return request({ path: API.refereeProfileOptions, method: 'GET', needAuth: true })
    .then((res) => (res && typeof res === 'object' ? res : {}));
}

function fetchRefereeProfile() {
  // 裁判未提交资料时后端返回 data:null，统一归一为空对象，避免调用方读字段时抛错
  return request({ path: API.refereeProfile, method: 'GET', needAuth: true })
    .then((res) => (res && typeof res === 'object' ? res : {}));
}

function resolveRefereeRegistrationCode(code) {
  if (isEmptyValue(code)) return rejectWith('裁判报名码无效');
  return request({ path: API.refereeRegistrationCode(String(code).trim()), method: 'GET', needAuth: false });
}

// 裁判角色是 [Flags] 位枚举（1-主裁 2-表现 4-难度 8-创意编排 16-完成质量）。
// 接口文档在 RefereeProfileSubmitInput/RefereeProfileDto 两处误写为 int 数组，
// 后端实际按单个 RefereeRole 反序列化，因此提交前合并为位标志，回显时再拆开。
function combineRefereeRoles(roles) {
  const list = Array.isArray(roles) ? roles : [roles];
  return list.reduce((mask, item) => {
    const value = Number(item);
    return Number.isFinite(value) && value > 0 ? mask | value : mask;
  }, 0);
}

function splitRefereeRoles(value) {
  if (Array.isArray(value)) return value.map(Number).filter((item) => Number.isFinite(item) && item > 0);
  const mask = Number(value);
  if (!Number.isFinite(mask) || mask <= 0) return [];
  const result = [];
  for (let bit = 1; bit <= mask; bit *= 2) {
    if (mask & bit) result.push(bit);
  }
  return result;
}

function submitRefereeProfile(payload) {
  const data = Object.assign({}, payload || {});
  data.roles = combineRefereeRoles(data.roles);
  return request({
    path: API.refereeProfileSubmit,
    method: 'POST',
    data,
    needAuth: true
  });
}

function fetchRefereeQuota(eventId) {
  if (isEmptyValue(eventId)) return rejectWith('缺少赛事ID');
  return request({ path: API.refereeApplicationQuota, method: 'GET', data: { eventId }, needAuth: true });
}

function fetchRefereeApplications() {
  return request({ path: API.refereeApplications, method: 'GET', needAuth: true });
}

function applyForReferee(event) {
  const payload = event && typeof event === 'object' ? event : {};
  if (isEmptyValue(payload.eventId)) return rejectWith('缺少赛事ID');
  return request({
    path: API.refereeApply,
    method: 'POST',
    data: { eventId: payload.eventId },
    needAuth: true
  });
}

module.exports = {
  fetchScoreEvents,
  fetchScoreFilters,
  queryScores,
  fetchCurrentCheckin,
  updateCheckinStatus,
  startCheckin,
  scanCheckin,
  markCheckinOnStage,
  fetchCheckinProgress,
  fetchRefereeProfileOptions,
  fetchRefereeProfile,
  resolveRefereeRegistrationCode,
  submitRefereeProfile,
  splitRefereeRoles,
  fetchRefereeQuota,
  fetchRefereeApplications,
  applyForReferee
};