import { parseHourMinute } from '../schedule-intent.mjs';
import { normalizePushWeatherCity } from './push-content/weather-delivery.mjs';
import {
  getPushSubscriptionById,
  PUSH_SUBSCRIPTION_ITEMS,
  resolvePushSubscriptionFromAlias,
} from './push-subscription-catalog.mjs';

const SUBSCRIPTION_ID_PATTERN = /^([1-9]|10)$/u;
const SUBSCRIPTION_ID_PREFIX_PATTERN = /^([1-9]|10)[\s：:，,、-]+(.+)$/u;
const SUBSCRIPTION_MODIFY_PATTERN = /^([1-9]|10)\s*(改|换|调整|设为|设置为|调到|改到|换成|改为)\s*(.+)$/u;
const SUBSCRIPTION_CANCEL_ID_PATTERN = /^取消\s*([1-9]|10)$/u;

const LIST_REQUEST_PATTERN = /^(我的订阅|订阅状态|订阅列表|已开通订阅)$/u;
const HELP_REQUEST_PATTERN = /^(订阅帮助|订阅菜单|推送菜单|推送帮助)$/u;
const CANCEL_ALL_PATTERN = /^(全部取消|取消全部|取消所有订阅)$/u;
const WEATHER_CITY_UPDATE_PATTERN = /^([1-9]|10)\s*(改|换|调整|设为|设置为|调到|改到|换成|改为)\s*城市\s*(.+)$/u;
const WEATHER_ALIAS_CITY_UPDATE_PATTERN = /^(天气|每日天气)\s*(改|换|调整|设为|设置为|调到|改到|换成|改为)\s*城市?\s*(.+)$/u;

function parseCityToken(raw) {
  const text = String(raw ?? '')
    .trim()
    .replace(/^(城市|设为|设置为|改成|改为|换为|换成)/u, '')
    .replace(/\s+/g, '')
    .replace(/市$/u, '');
  if (!text || text.length > 6) return null;
  if (!/^[\u4e00-\u9fff]{2,6}$/u.test(text)) return null;
  return normalizePushWeatherCity(text);
}

function parseWeatherConfirmSegment(segment) {
  const raw = String(segment ?? '').trim();
  if (!raw) return { hour: null, minute: null, options: null };

  const time = parseHourMinute(raw);
  if (time) {
    const remainder = raw
      .replace(/(?:今天|明天|后天|今晚|明晚|明早|今早)?(?:早上|上午|清晨|中午|下午|傍晚|晚上|凌晨)?(?:[0-9]{1,2}|[零一二两三四五六七八九十]{1,3})(?:点|:|：)(?:半|[0-9]{1,2}分?)?/u, '')
      .trim();
    const city = parseCityToken(remainder);
    return {
      hour: time.hour,
      minute: time.minute,
      options: city ? { city } : null,
    };
  }

  const city = parseCityToken(raw);
  if (city) {
    return { hour: null, minute: null, options: { city } };
  }
  return { hour: null, minute: null, options: null };
}

function parseSubscriptionIdToken(token) {
  const raw = String(token ?? '').trim();
  if (SUBSCRIPTION_ID_PATTERN.test(raw)) return Number(raw);
  if (raw === '１') return 1;
  if (raw === '２') return 2;
  if (raw === '３') return 3;
  if (raw === '４') return 4;
  if (raw === '５') return 5;
  if (raw === '６') return 6;
  if (raw === '７') return 7;
  if (raw === '８') return 8;
  if (raw === '９') return 9;
  if (raw === '１０') return 10;
  return null;
}

/**
 * 解析开通指令：`2` / `2 7点` / `2 7:30`
 * @returns {{ item: object, hour: number|null, minute: number|null }|null}
 */
export function parsePushSubscriptionConfirmReply(
  text,
  { defaultHourResolver = null } = {},
) {
  const raw = String(text ?? '').trim();
  if (!raw) return null;

  const compact = raw.replace(/\s+/g, '');
  const bareId = parseSubscriptionIdToken(compact);
  if (bareId != null && compact.length <= 2) {
    const item = getPushSubscriptionById(bareId);
    if (!item) return null;
    return { item, hour: null, minute: null };
  }

  const prefixed = raw.match(SUBSCRIPTION_ID_PREFIX_PATTERN);
  if (prefixed) {
    const item = getPushSubscriptionById(Number(prefixed[1]));
    if (!item) return null;
    if (item.key === 'weather') {
      const weather = parseWeatherConfirmSegment(prefixed[2]);
      return {
        item,
        hour: weather.hour,
        minute: weather.minute,
        options: weather.options,
      };
    }
    const time = parseHourMinute(prefixed[2]);
    return { item, hour: time?.hour ?? null, minute: time?.minute ?? null, options: null };
  }

  return null;
}

/** @returns {{ item: object, options: { city: string } }|null} */
export function parsePushSubscriptionCityUpdate(text) {
  const raw = String(text ?? '').trim();
  if (!raw) return null;

  const byId = raw.match(WEATHER_CITY_UPDATE_PATTERN);
  if (byId) {
    const item = getPushSubscriptionById(Number(byId[1]));
    const city = parseCityToken(byId[3]);
    if (!item || item.key !== 'weather' || !city) return null;
    return { item, options: { city } };
  }

  const byAlias = raw.replace(/\s+/g, '').match(WEATHER_ALIAS_CITY_UPDATE_PATTERN);
  if (byAlias) {
    const item = resolvePushSubscriptionFromAlias('天气');
    const city = parseCityToken(byAlias[3]);
    if (!item || !city) return null;
    return { item, options: { city } };
  }

  return null;
}

/** @returns {{ item: object }|{ all: true }|null} */
export function parsePushSubscriptionCancelRequest(text) {
  const raw = String(text ?? '').trim();
  const compact = raw.replace(/\s+/g, '');
  if (!compact) return null;
  if (CANCEL_ALL_PATTERN.test(compact)) return { all: true };

  const byId = compact.match(SUBSCRIPTION_CANCEL_ID_PATTERN);
  if (byId) {
    const item = getPushSubscriptionById(Number(byId[1]));
    return item ? { item } : null;
  }

  const aliasItem = resolvePushSubscriptionFromAlias(compact);
  if (!aliasItem) return null;
  const hasCancelCue = /(取消|关闭|不要|停止)/u.test(compact);
  if (!hasCancelCue) return null;
  return { item: aliasItem };
}

/** @returns {{ item: object, hour: number, minute: number }|null} */
export function parsePushSubscriptionModifyRequest(text) {
  const raw = String(text ?? '').trim();
  if (!raw) return null;

  const byId = raw.match(SUBSCRIPTION_MODIFY_PATTERN);
  if (byId) {
    const item = getPushSubscriptionById(Number(byId[1]));
    const time = parseHourMinute(byId[3]);
    if (!item || !time) return null;
    return { item, hour: time.hour, minute: time.minute };
  }

  const compact = raw.replace(/\s+/g, '');
  const aliasItem = resolvePushSubscriptionFromAlias(compact);
  const hasModifyCue = /(改|换|调整|设为|设置为|调到|改到|换成|改为)/u.test(compact);
  if (!aliasItem || !hasModifyCue) return null;
  const time = parseHourMinute(raw);
  if (!time) return null;
  return { item: aliasItem, hour: time.hour, minute: time.minute };
}

export function parsePushSubscriptionListRequest(text) {
  const compact = String(text ?? '').replace(/\s+/g, '');
  return LIST_REQUEST_PATTERN.test(compact);
}

export function parsePushSubscriptionHelpRequest(text) {
  const compact = String(text ?? '').replace(/\s+/g, '');
  return HELP_REQUEST_PATTERN.test(compact);
}

export function resolvePushSubscriptionConfirmTime(
  item,
  { hour = null, minute = null, defaultHourResolver = null } = {},
) {
  if (Number.isInteger(hour) && hour >= 0 && hour <= 23
    && Number.isInteger(minute) && minute >= 0 && minute <= 59) {
    return { hour, minute };
  }
  if (typeof defaultHourResolver === 'function') {
    const resolved = defaultHourResolver(item);
    if (resolved) return resolved;
  }
  return { hour: item.defaultHour, minute: item.defaultMinute };
}

export function isPushSubscriptionNumericReply(text) {
  return parsePushSubscriptionConfirmReply(text) != null;
}

export function listPushSubscriptionAliasKeys() {
  return PUSH_SUBSCRIPTION_ITEMS.flatMap((item) => item.aliases);
}