import {
  addLocalDays,
  getLocalParts,
  normalizeTimezone,
  zonedTimeToEpochMs,
} from './schedule-time.mjs';
import {
  hasReminderSetupCue,
  isWeeklyScheduleCue,
  normalizeScheduleUtterance,
} from './schedule-utterance-normalize.mjs';

function normalizeText(text) {
  return String(text ?? '')
    .replace(/^(?:嗯|那个|就是|然后|呃|能不能|请|帮我|麻烦|嗨|好的|好)+/u, '')
    .replace(/\s+/g, '')
    .trim();
}

/** ASR/wechat often inserts spaces around colons, e.g. "17 ：08". */
function normalizeLooseTimeText(text) {
  return normalizeScheduleUtterance(text);
}

function pad2(value) {
  return String(value).padStart(2, '0');
}

function chineseHourToNumber(value) {
  const raw = String(value ?? '').trim();
  if (/^\d{1,2}$/.test(raw)) return Number(raw);
  const map = {
    零: 0,
    一: 1,
    二: 2,
    两: 2,
    三: 3,
    四: 4,
    五: 5,
    六: 6,
    七: 7,
    八: 8,
    九: 9,
    十: 10,
  };
  if (raw === '十') return 10;
  if (raw.startsWith('十')) return 10 + (map[raw.slice(1)] ?? 0);
  if (raw.endsWith('十')) return (map[raw[0]] ?? 0) * 10;
  if (raw.includes('十')) {
    const [tens, ones] = raw.split('十');
    return (map[tens] ?? 1) * 10 + (map[ones] ?? 0);
  }
  return map[raw] ?? null;
}

export function parseHourMinute(text) {
  const normalized = normalizeLooseTimeText(text);
  let match = normalized.match(
    /(?:今天|明天|后天|今晚|明晚|明早|今早)?(?:早上|上午|清晨|每天(?:早上|上午)?)?(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?)?/,
  );
  if (!match) {
    match = normalized.match(
      /(?: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)?(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?)?/,
    );
  }
  if (!match) return null;
  const period = String(match[1] ?? '');
  let hour = chineseHourToNumber(match[2]);
  if (hour === null || hour < 0 || hour > 23) return null;
  let minute = 0;
  if (match[3] === '半') minute = 30;
  else if (match[3]) minute = Number(String(match[3]).replace('分', ''));
  if (!Number.isFinite(minute) || minute < 0 || minute > 59) return null;
  if (period === '中午') {
    hour = 12;
  } else if (/下午|傍晚|晚上/u.test(period) && hour < 12) {
    hour += 12;
  } else if (/上午|早上|清晨|凌晨/u.test(period) && hour === 12) {
    hour = 0;
  } else if (/今晚/u.test(normalized) && hour < 12 && !/上午|早上|清晨|凌晨/u.test(period)) {
    hour += 12;
  }
  return { hour, minute };
}

function countTimeExpressions(text) {
  const normalized = normalizeLooseTimeText(text);
  const matches = normalized.match(
    /[0-9零一二两三四五六七八九十]{1,3}(?:点|:|：)(?:半|[0-9]{1,2}(?:分(?!开)|(?![0-9]))?)?/gu,
  );
  return matches?.length ?? 0;
}

function wantsSimpleTimedReminder(compact, text) {
  if (isWeeklyScheduleCue(compact)) return false;
  if (!hasReminderSetupCue(compact)) return false;
  if (countTimeExpressions(text) !== 1) return false;
  if (/[0-9零一二两三四五六七八九十]{1,3}(?:点|:|：).{1,24}[0-9零一二两三四五六七八九十]{1,3}(?:点|:|：)/u.test(compact)) {
    return false;
  }
  return parseHourMinute(text) != null;
}

function extractTimedReminderTitle(text) {
  const original = String(text ?? '').trim();
  const commaParts = original.split(/[，,]/).map((part) => part.trim()).filter(Boolean);
  if (commaParts.length > 1) {
    const tail = commaParts[commaParts.length - 1];
    const tailTitle = cleanupTimedReminderTitleFragment(tail);
    if (tailTitle && tailTitle.length >= 2) return tailTitle;
  }
  return cleanupTimedReminderTitleFragment(original);
}

function cleanupTimedReminderTitleFragment(text) {
  let title = normalizeLooseTimeText(String(text ?? '').trim());
  title = title
    .replace(/^(?:帮我|请|麻烦)?(?:设置|设|创建|添加)(?:一个|个)?提醒[，,、:：\s]*/u, '')
    .replace(/^(?:帮我|请)?(?:设置|设)(?:一个|个)?(?:待办|代办|带办|代拜)[，,、:：\s]*/u, '');
  title = title
    .replace(/^(?:帮我|请|麻烦)?(?:设置|设|加|添加|创建|安排|定)(?:一个|个|一下)?(?:每天|每日|天天)?/u, '')
    .replace(/^(?:帮我|请|麻烦)?(?:加个|添加|创建|安排)(?:一个|个)?提醒/u, '')
    .replace(/^(?:帮我|请|麻烦)?(?:定|设)个?(?:闹钟|闹铃)/u, '')
    .replace(/(?:今天|今日|今晚|明天|后天|明早|今早)/gu, ' ')
    .replace(/(?:每天|每日|天天)/gu, ' ')
    .replace(/(?:早上|上午|清晨|中午|下午|傍晚|晚上|凌晨)/gu, ' ')
    .replace(
      /[0-9零一二两三四五六七八九十]{1,3}(?:点|:|：)(?:半|[0-9]{1,2}(?:\s*分(?!开)|(?![0-9]))?)?/gu,
      ' ',
    )
    .replace(/(?:提醒我|提醒|闹钟|闹铃|叫我|设置提醒|设提醒|备忘提醒|定时提醒)/gu, ' ')
    .replace(/[，,、:：]/g, ' ')
    .replace(/\s+/g, ' ')
    .trim();
  title = title
    .replace(/^(?:嗯|那个|就是|然后|呃|能不能|请|帮我|麻烦|嗨)+/u, '')
    .replace(/^(?:去|来)?(?:参加|进行)?(?:一个|个)?/u, '')
    .trim();
  title = title.replace(/^分开/u, '开会').replace(/开会会/u, '开会');
  if (!title || title.length < 2 || /^(?:请|麻烦|能不能|嗨|嗯|那个|帮我)$/u.test(title)) return null;
  return title;
}

export function buildTimedReminderLocal({
  text,
  hour,
  minute = 0,
  timezone = 'Asia/Shanghai',
  now = Date.now(),
} = {}) {
  const compact = normalizeText(text);
  let dayOffset = 0;
  if (/后天/u.test(compact)) dayOffset = 2;
  else if (/明天|明早|明晚/u.test(compact)) dayOffset = 1;
  else if (/今晚/u.test(compact)) dayOffset = 0;
  else if (/今早/u.test(compact)) dayOffset = 0;

  const tz = normalizeTimezone(timezone);
  let dayStart = addLocalDays(now, dayOffset, tz);
  let parts = getLocalParts(dayStart, tz);
  let remindAt = zonedTimeToEpochMs(
    {
      year: parts.year,
      month: parts.month,
      day: parts.day,
      hour,
      minute,
      second: 0,
    },
    tz,
  );
  if (remindAt <= now) {
    dayStart = addLocalDays(dayStart, 1, tz);
    parts = getLocalParts(dayStart, tz);
    remindAt = zonedTimeToEpochMs(
      {
        year: parts.year,
        month: parts.month,
        day: parts.day,
        hour,
        minute,
        second: 0,
      },
      tz,
    );
  }
  const localParts = getLocalParts(remindAt, tz);
  return `${localParts.year}-${pad2(localParts.month)}-${pad2(localParts.day)} ${pad2(localParts.hour)}:${pad2(localParts.minute)}`;
}

function parseSimpleTimedReminder(text, { timezone = 'Asia/Shanghai', now = Date.now() } = {}) {
  const compact = normalizeText(text);
  if (!wantsSimpleTimedReminder(compact, text)) return null;
  const time = parseHourMinute(text);
  if (!time) return null;
  const title = extractTimedReminderTitle(text);
  if (!title || title.length < 2) {
    const needsClarification = time ? ['reminder_title'] : ['reminder_time', 'reminder_title'];
    const partial = {
      action: 'create_timed_reminder',
      needsClarification,
    };
    if (time) {
      partial.hour = time.hour;
      partial.minute = time.minute;
      partial.remindLocal = buildTimedReminderLocal({
        text,
        hour: time.hour,
        minute: time.minute,
        timezone,
        now,
      });
    }
    return partial;
  }
  return {
    action: 'create_timed_reminder',
    title,
    remindLocal: buildTimedReminderLocal({
      text,
      hour: time.hour,
      minute: time.minute,
      timezone,
      now,
    }),
    hour: time.hour,
    minute: time.minute,
    recurrence: /(?:每天|每日|天天)/u.test(compact) ? 'daily' : 'once',
  };
}

function extractTodoTitle(text) {
  const original = String(text ?? '').trim();
  if (!original) return null;
  const quoted = original.match(/[「『【（(“"']([^」』】）)”"']{1,80})[」』】）)”"']/);
  if (quoted?.[1]) {
    const title = quoted[1].trim();
    if (title) return title;
  }
  const trailingCommand = original.match(
    /^(.{1,80}?)(?:帮我)?(?:设|设置|设下|记)(?:一个|下一个)?(?:待办|代办|带办|代拜)(?:吧|一下)?$/u,
  );
  if (trailingCommand?.[1]) {
    const title = trailingCommand[1].trim();
    if (title) return title;
  }
  const cleaned = original
    .replace(
      /^.*?(?:不用提醒|先记一下|帮我记一下|帮我记|记一下|添加待办|添加任务|记个待办|记个任务|设置一个待办|设置一个代办|设置一个带办|设置一个代拜|设置下一个代拜|设下一个代拜|帮我设置一个待办|帮我设置一个代办|帮我设置一个带办|帮我设置一个代拜|待办|代办|带办|代拜|任务)(?:[:：,，、\s]+)?/u,
      '',
    )
    .trim();
  return cleaned || null;
}

function wantsDailyTodoDigest(compact) {
  const daily = /每天|每日|天天/.test(compact);
  const send = /发|发送|推送|提醒|通知|给我/.test(compact);
  const digest =
    /(待办|todo|任务).*(记录|列表|清单|安排|摘要|汇总)/.test(compact)
    || /(今天|今日|当天).*(待办|todo|任务)/.test(compact)
    || /(待办|todo|任务).*(今天|今日|当天)/.test(compact)
    || /一天的待办/.test(compact);
  if (digest && /(?:页面|网页|html|h5)/iu.test(compact)) return false;
  if (daily && send && digest) return true;
  // 「早上7点把当天待办发给我」省略了「每天」但语义仍是 digest
  if (!daily && send && /(当天|今天|今日).*(待办|todo|任务)/.test(compact) && parseHourMinute(compact)) {
    return true;
  }
  return false;
}

export function parseScheduleIntent(text, {
  timezone = process.env.H5_DEFAULT_TIMEZONE || 'Asia/Shanghai',
  now = Date.now(),
} = {}) {
  const compact = normalizeText(text);
  if (!compact) return { action: 'none' };

  if (wantsDailyTodoDigest(compact)) {
    const time = parseHourMinute(compact);
    if (!time) {
      return {
        action: 'create_daily_todo_digest',
        needsClarification: ['digest_time'],
      };
    }
    return {
      action: 'create_daily_todo_digest',
      hour: time.hour,
      minute: time.minute,
    };
  }

  const wantsBalanceAlert = /(余额|钱包|账户).*(不足|低于|提醒|预警|通知)|余额不足|低余额|余额预警/.test(compact);
  if (wantsBalanceAlert) {
    const thresholdMatch = compact.match(/(?:低于|少于|不足|小于)(\d{1,6})(?:元|块|rmb|人民币|cny)?/i);
    const thresholdYuan = thresholdMatch ? Number(thresholdMatch[1]) : null;
    const thresholdCents = thresholdYuan == null ? null : Math.max(0, Math.round(thresholdYuan * 100));
    return thresholdCents == null
      ? { action: 'create_balance_alert', needsClarification: ['threshold'] }
      : { action: 'create_balance_alert', thresholdCents };
  }

  if (/看看|查看|看下|列出/.test(compact) && /(待办|日程|行程|计划|任务)/.test(compact)) {
    return { action: 'query_schedule' };
  }

  const timedReminder = parseSimpleTimedReminder(text, { timezone, now });
  if (timedReminder) return timedReminder;

  if (/^(?:帮我|请|麻烦)?(?:设置|设)(?:一个|个|一下)?提醒$/u.test(compact)
    || /^(?:帮我|请|麻烦)?(?:加个|添加|创建|安排)(?:一个|个)?提醒$/u.test(compact)
    || /^(?:帮我|请|麻烦)?(?:定|设)个?(?:闹钟|闹铃)$/u.test(compact)) {
    return {
      action: 'create_timed_reminder',
      needsClarification: ['reminder_time', 'reminder_title'],
    };
  }

  const wantsTodoRecord =
    /(不用提醒|先记一下|帮我记一下|帮我记|记一下|添加待办|添加任务|记个待办|记个任务|设置一个待办|设置一个代办|设置一个带办|设置一个代拜|设置下一个代拜|设下一个代拜|帮我设置一个待办|帮我设置一个代办|帮我设置一个带办|帮我设置一个代拜|待办|代办|带办|代拜|任务)/.test(
      compact,
    );
  if (wantsTodoRecord) {
    const explicitNoReminder = /(不用提醒|不提醒|先记一下)/.test(compact);
    const hasScheduleTime = /(提醒|闹钟|叫我|今天|今晚|明天|后天|早上|上午|中午|下午|晚上|[0-9零一二两三四五六七八九十]{1,3}(点|:|：))/.test(
      compact,
    );
    if (!explicitNoReminder && hasScheduleTime) {
      return { action: 'schedule_agent' };
    }
    const title = extractTodoTitle(text);
    if (!title) {
      return { action: 'create_todo', needsClarification: ['todo_title'] };
    }
    return { action: 'create_todo', title };
  }

  return { action: 'none' };
}

export function isScheduleIntent(intent) {
  return intent?.action && intent.action !== 'none';
}

export function shouldUseScheduleAssistant(text) {
  const compact = normalizeText(text);
  if (!compact) return false;
  // Scheduled automation (execute + deliver) uses scheduled-task-automation skill.
  if (/(?:定时(?:自动)?任务|scheduled\s*task|scheduled\s*automation)/iu.test(compact)) return false;
  if (/(?:每天|每日|每周|定时|到点|届时|自动)/u.test(compact)
    && /(?:做|生成|制作|创建|写|执行|跑|更新|整理|汇总|推送)/u.test(compact)
    && !/(?:提醒我|待办记录|待办列表|待办清单|当天待办|一天的待办)/u.test(compact)) {
    return false;
  }
  if (isScheduleIntent(parseScheduleIntent(text))) return true;
  if (hasReminderSetupCue(compact) && !isWeeklyScheduleCue(compact)) return true;
  const scheduleKeywords = /(提醒|待办|代办|带办|代拜|日程|行程|安排|计划|闹钟|闹铃)/;
  const timeKeywords = /(今天|今晚|明天|后天|早上|上午|中午|下午|晚上|\d{1,2}[点:：]|[零一二两三四五六七八九十]{1,3}点)/;
  return scheduleKeywords.test(compact) && timeKeywords.test(compact);
}

/** Last-resort timed reminder when colloquial phrasing missed parseScheduleIntent. */
export function tryResolveTimedReminderIntent(text, {
  timezone = process.env.H5_DEFAULT_TIMEZONE || 'Asia/Shanghai',
  now = Date.now(),
} = {}) {
  const parsed = parseScheduleIntent(text, { timezone, now });
  if (parsed.action === 'create_timed_reminder') return parsed;

  const compact = normalizeText(text);
  if (!hasReminderSetupCue(compact) || isWeeklyScheduleCue(compact)) return null;
  if (countTimeExpressions(text) !== 1 || !parseHourMinute(text)) return null;

  const time = parseHourMinute(text);
  const title = extractTimedReminderTitle(text);
  if (title && title.length >= 2) {
    return {
      action: 'create_timed_reminder',
      title,
      remindLocal: buildTimedReminderLocal({ text, hour: time.hour, minute: time.minute, timezone, now }),
      hour: time.hour,
      minute: time.minute,
      recurrence: /(?:每天|每日|天天)/u.test(compact) ? 'daily' : 'once',
    };
  }
  return {
    action: 'create_timed_reminder',
    needsClarification: ['reminder_title'],
    hour: time.hour,
    minute: time.minute,
    remindLocal: buildTimedReminderLocal({ text, hour: time.hour, minute: time.minute, timezone, now }),
    recurrence: /(?:每天|每日|天天)/u.test(compact) ? 'daily' : 'once',
  };
}