// ==================== Baby Tracker Utilities ====================
window.BabyUtils = (() => {
  'use strict';

  // --- Constants ---
  const TYPE_LABELS = { milk: '喝奶', food: '辅食', poo: '便便', meds: '药品' };
  const TYPE_ICONS = { milk: '🍼', food: '🥣', poo: '💩', meds: '💊' };
  const DAY_LABELS = ['周日', '周一', '周二', '周三', '周四', '周五', '周六'];
  const CN_OFFSET_MS = 8 * 60 * 60 * 1000;
  const AVG_DAYS_PER_MONTH = 30.4375;

  // --- Standard Growth Data (WS/T 423-2022 Boy) ---
  // Each row: [P3, P15, P50, P85, P97]
  const STANDARD_DATA_BOY = {
    months: [0, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 18, 21, 24],
    weight: [
      [2.58, 2.96, 3.38, 3.84, 4.31], [3.58, 4.04, 4.54, 5.08, 5.61],
      [4.46, 5.03, 5.64, 6.30, 6.94], [5.17, 5.82, 6.51, 7.25, 7.96],
      [5.73, 6.44, 7.19, 7.99, 8.76], [6.17, 6.93, 7.73, 8.58, 9.39],
      [6.53, 7.33, 8.17, 9.06, 9.91], [7.09, 7.95, 8.86, 9.81, 10.73],
      [7.53, 8.44, 9.40, 10.42, 11.39], [7.90, 8.86, 9.86, 10.93, 11.96],
      [8.40, 9.41, 10.48, 11.64, 12.75], [8.88, 9.96, 11.09, 12.33, 13.53],
      [9.35, 10.51, 11.71, 13.04, 14.32], [9.83, 11.06, 12.33, 13.74, 15.12]
    ],
    height: [
      [46.6, 48.2, 50.0, 51.8, 53.3], [50.9, 52.6, 54.5, 56.4, 58.0],
      [54.3, 56.1, 58.1, 60.1, 61.8], [57.0, 58.9, 61.0, 63.1, 64.9],
      [59.2, 61.2, 63.4, 65.5, 67.4], [61.1, 63.1, 65.4, 67.6, 69.5],
      [62.7, 64.8, 67.1, 69.4, 71.3], [65.5, 67.7, 70.1, 72.5, 74.5],
      [67.9, 70.1, 72.6, 75.1, 77.3], [69.9, 72.3, 74.9, 77.5, 79.9],
      [72.7, 75.2, 78.0, 80.8, 83.4], [75.2, 77.9, 80.9, 83.9, 86.6],
      [77.5, 80.4, 83.6, 86.8, 89.7], [79.8, 82.8, 86.2, 89.6, 92.7]
    ],
    head: [
      [32.3, 33.1, 34.0, 34.9, 35.7], [35.3, 36.1, 37.0, 37.9, 38.8],
      [37.1, 38.0, 38.9, 39.8, 40.7], [38.4, 39.3, 40.3, 41.2, 42.1],
      [39.4, 40.3, 41.3, 42.3, 43.2], [40.2, 41.2, 42.2, 43.2, 44.1],
      [40.9, 41.9, 42.9, 43.9, 44.9], [42.0, 43.0, 44.1, 45.1, 46.1],
      [42.8, 43.9, 45.0, 46.1, 47.1], [43.5, 44.6, 45.7, 46.9, 47.9],
      [44.3, 45.4, 46.6, 47.8, 48.9], [45.0, 46.1, 47.3, 48.5, 49.7],
      [45.5, 46.7, 47.9, 49.1, 50.3], [46.0, 47.2, 48.4, 49.7, 50.9]
    ],
    bmi: [
      [12.2, 13.4, 14.6, 15.9, 17.3], [12.4, 13.6, 14.9, 16.3, 17.8],
      [13.7, 15.0, 16.3, 17.8, 19.4], [14.3, 15.5, 16.9, 18.4, 20.0],
      [14.5, 15.8, 17.2, 18.7, 20.3], [14.7, 15.9, 17.3, 18.8, 20.5],
      [14.7, 16.0, 17.3, 18.8, 20.5], [14.7, 15.9, 17.3, 18.7, 20.4],
      [14.6, 15.7, 17.0, 18.5, 20.1], [14.4, 15.5, 16.8, 18.2, 19.8],
      [14.1, 15.2, 16.4, 17.8, 19.4], [13.9, 14.9, 16.1, 17.5, 19.0],
      [13.7, 14.7, 15.9, 17.2, 18.7], [13.6, 14.6, 15.7, 17.0, 18.5]
    ]
  };

  // --- Date / Time (always Asia/Shanghai) ---

  /** Current time as ISO string shifted to UTC+8 wall-clock representation */
  function getNowCNStr() {
    return new Date(Date.now() + CN_OFFSET_MS).toISOString();
  }

  /** YYYY-MM-DD in Asia/Shanghai */
  function getTodayCN() {
    return getNowCNStr().slice(0, 10);
  }

  /** YYYY-MM-DD of yesterday in Asia/Shanghai */
  function getYesterdayCN() {
    const d = new Date(Date.now() + CN_OFFSET_MS);
    d.setUTCDate(d.getUTCDate() - 1);
    return d.toISOString().slice(0, 10);
  }

  /** Format ISO timestamp → HH:mm in Asia/Shanghai */
  function formatTimeCN(iso) {
    return new Date(iso).toLocaleTimeString('zh-CN', {
      hour: '2-digit',
      minute: '2-digit',
      hour12: false,
      timeZone: 'Asia/Shanghai'
    });
  }

  /** datetime-local value (YYYY-MM-DDTHH:mm) → UTC ISO string (assumes +08:00) */
  function toISOFromCNLocal(datetimeLocal) {
    if (!datetimeLocal) return new Date().toISOString();
    // Ensure seconds are present
    const withSec = datetimeLocal.length === 16 ? `${datetimeLocal}:00` : datetimeLocal;
    return new Date(`${withSec}+08:00`).toISOString();
  }

  /** Day-of-week label for a YYYY-MM-DD string (no timezone ambiguity) */
  function getDayLabel(dateStr) {
    // Append T12:00:00 to avoid DST/UTC edge cases around midnight
    const d = new Date(`${dateStr}T12:00:00+08:00`);
    return DAY_LABELS[d.getDay()] || '';
  }

  /** Add N calendar days to a YYYY-MM-DD string, return YYYY-MM-DD */
  function addDays(dateStr, days) {
    const d = new Date(`${dateStr}T12:00:00+08:00`);
    d.setDate(d.getDate() + days);
    const y = d.getFullYear();
    const m = String(d.getMonth() + 1).padStart(2, '0');
    const day = String(d.getDate()).padStart(2, '0');
    return `${y}-${m}-${day}`;
  }

  /** Age in months between two Date objects */
  function getMonthDiff(dateFrom, dateTo) {
    return parseFloat(((dateTo - dateFrom) / (1000 * 60 * 60 * 24 * AVG_DAYS_PER_MONTH)).toFixed(2));
  }

  /**
   * Human-readable age string relative to a date string (YYYY-MM-DD).
   * e.g. "1岁2个月5天"
   */
  function getAgeDisplay(birthDateStr, currentDateStr) {
    if (!birthDateStr) return '';

    const birth = parseFlexibleDate(birthDateStr);
    const current = new Date(`${currentDateStr}T12:00:00+08:00`);
    birth.setHours(0, 0, 0, 0);
    current.setHours(0, 0, 0, 0);

    if (current < birth) return '👶 等待出生';
    if (current.getTime() === birth.getTime()) return '🎂 出生当天';

    let years = current.getFullYear() - birth.getFullYear();
    let months = current.getMonth() - birth.getMonth();
    let days = current.getDate() - birth.getDate();

    if (days < 0) {
      months--;
      const lastMonth = new Date(current.getFullYear(), current.getMonth(), 0);
      days += lastMonth.getDate();
    }
    if (months < 0) {
      years--;
      months += 12;
    }

    let str = '';
    if (years > 0) str += years + '岁';
    if (months > 0) str += months + '个月';
    str += days + '天';
    return str;
  }

  /** Parse 'YYYY/MM/DD' or 'YYYY-MM-DD' into a local Date at midnight */
  function parseFlexibleDate(str) {
    const normalized = String(str).replace(/\//g, '-');
    const [y, m, d] = normalized.split('-').map(Number);
    return new Date(y, m - 1, d);
  }

  // --- Display helpers ---

  function formatType(t) {
    return TYPE_LABELS[t] || t;
  }

  function getIcon(t) {
    return TYPE_ICONS[t] || '';
  }

  function isVitDRecord(row) {
    if (!row || row.type !== 'meds') return false;
    const sub = row.sub_type || '';
    return sub.includes('维D') || sub.includes('Vitamin') || sub.includes('VD');
  }

  /** Human-readable elapsed time since an ISO timestamp */
  function getTimeDiff(recordTime, nowMs = Date.now()) {
    const diff = nowMs - new Date(recordTime).getTime();
    if (diff < 0) return '刚刚';
    const totalMinutes = Math.floor(diff / 60000);
    if (totalMinutes < 1) return '刚刚';
    if (totalMinutes < 60) return `${totalMinutes}分钟`;
    const hours = Math.floor(totalMinutes / 60);
    const minutes = totalMinutes % 60;
    if (hours < 24) return minutes > 0 ? `${hours}小时${minutes}分` : `${hours}小时`;
    const days = Math.floor(hours / 24);
    return `${days}天${hours % 24}小时`;
  }

  // --- Growth chart standard series ---

  function generateStandardSeries(dataKey) {
    // Recessive neutral greys — percentile bands stay behind baby data
    const labels = ['P3', 'P15', 'P50', 'P85', 'P97'];
    const lineStyles = ['dashed', 'solid', 'solid', 'solid', 'dashed'];
    const widths = [1, 1, 1.5, 1, 1];
    const colors = ['#D9D3CA', '#C4BDB4', '#9A938A', '#C4BDB4', '#D9D3CA'];
    const data = STANDARD_DATA_BOY[dataKey];
    if (!data) return [];

    return labels.map((name, i) => ({
      name,
      type: 'line',
      data: STANDARD_DATA_BOY.months.map((m, idx) => [m, data[idx][i]]),
      smooth: true,
      showSymbol: false,
      lineStyle: { color: colors[i], width: widths[i], type: lineStyles[i] },
      animation: false,
      emphasis: { disabled: true },
      silent: true
    }));
  }

  // --- Misc utilities ---

  function debounce(fn, delay = 300) {
    let timer;
    return function (...args) {
      clearTimeout(timer);
      timer = setTimeout(() => fn.apply(this, args), delay);
    };
  }

  async function copyToClipboard(text) {
    try {
      if (navigator.clipboard && window.isSecureContext) {
        await navigator.clipboard.writeText(text);
        return true;
      }
    } catch {
      // fall through to legacy path
    }

    // Fallback for older browsers / non-HTTPS
    try {
      const textArea = document.createElement('textarea');
      textArea.value = text;
      textArea.setAttribute('readonly', '');
      textArea.style.cssText = 'position:fixed;left:-9999px;top:0;opacity:0';
      document.body.appendChild(textArea);
      textArea.focus();
      textArea.select();
      const ok = document.execCommand('copy');
      document.body.removeChild(textArea);
      return ok;
    } catch {
      return false;
    }
  }

  function toast(message, type = 'info') {
    try {
      const store = window.Alpine && Alpine.store && Alpine.store('toast');
      if (store) {
        store.show(message, type);
        return;
      }
    } catch {
      // Alpine not ready
    }
    // Ultimate fallback
    console.log(`[${type}] ${message}`);
  }

  /** Revoke a blob: URL if present */
  function revokeObjectURL(url) {
    if (url && typeof url === 'string' && url.startsWith('blob:')) {
      try { URL.revokeObjectURL(url); } catch { /* ignore */ }
    }
  }

  /** Calculate BMI from weight(kg) and height(cm) */
  function calcBMI(weight, height) {
    if (!weight || !height || height <= 0) return null;
    return parseFloat((weight / Math.pow(height / 100, 2)).toFixed(2));
  }

  return {
    STANDARD_DATA_BOY,
    TYPE_LABELS,
    TYPE_ICONS,
    getMonthDiff,
    generateStandardSeries,
    getNowCNStr,
    getTodayCN,
    getYesterdayCN,
    formatTimeCN,
    toISOFromCNLocal,
    formatType,
    getIcon,
    getDayLabel,
    addDays,
    getAgeDisplay,
    parseFlexibleDate,
    isVitDRecord,
    getTimeDiff,
    debounce,
    copyToClipboard,
    toast,
    revokeObjectURL,
    calcBMI
  };
})();