import { useState } from 'react';
import { View, Text, Input, Picker } from '@tarojs/components';
import Taro, { useDidShow } from '@tarojs/taro';
import { z } from 'zod';
import { createDailyMonitoring } from '@/services/health';
import { useAuthStore } from '@/stores/auth';
import { useHealthStore } from '@/stores/health';
import { usePointsStore } from '@/stores/points';
import { clearRequestCache } from '@/services/request';
import { trackEvent } from '@/services/analytics';
import { useElderClass } from '../../../hooks/useElderClass';
import './index.scss';

const bpSchema = z.number().min(30, '血压值不能低于30').max(300, '血压值不能高于300').optional();
const weightSchema = z.number().min(1, '体重不能低于1kg').max(500, '体重不能高于500kg').optional();
const bloodSugarSchema = z.number().min(0.1, '血糖值不能低于0.1').max(50, '血糖值不能高于50').optional();
const volumeSchema = z.number().min(0, '数值不能为负').max(10000, '数值超出合理范围').optional();

function formatDate(date: Date): string {
  const y = date.getFullYear();
  const m = String(date.getMonth() + 1).padStart(2, '0');
  const d = String(date.getDate()).padStart(2, '0');
  return `${y}-${m}-${d}`;
}

// ── Abnormal value detection ──

const REFERENCE_RANGES: Record<string, { min: number; max: number } | null> = {
  systolic: { min: 90, max: 140 },
  diastolic: { min: 60, max: 90 },
  bloodSugar: { min: 3.9, max: 6.1 },
  weight: null,
  fluidIntake: null,
  urineOutput: null,
};

type AbnormalResult = { abnormal: boolean; direction: 'high' | 'low' | null };

const checkAbnormal = (value: string, field: string): AbnormalResult => {
  const ref = REFERENCE_RANGES[field];
  if (!value || !ref) return { abnormal: false, direction: null };
  const num = parseFloat(value);
  if (isNaN(num)) return { abnormal: false, direction: null };
  if (num > ref.max) return { abnormal: true, direction: 'high' };
  if (num < ref.min) return { abnormal: true, direction: 'low' };
  return { abnormal: false, direction: null };
};

// ── Section state type ──

type SectionKey = 'morning' | 'evening' | 'other';

const FIELD_LABELS: Record<string, string> = {
  morningSystolic: '晨间收缩压',
  morningDiastolic: '晨间舒张压',
  eveningSystolic: '晚间收缩压',
  eveningDiastolic: '晚间舒张压',
  bloodSugar: '血糖',
};

export default function DailyMonitoring() {
  const modeClass = useElderClass();
  const { currentPatient } = useAuthStore();

  const today = formatDate(new Date());
  const [dateIdx, setDateIdx] = useState(0);
  const [dateList] = useState(() => {
    const list: string[] = [];
    for (let i = 0; i < 30; i++) {
      const d = new Date();
      d.setDate(d.getDate() - i);
      list.push(formatDate(d));
    }
    return list;
  });
  const recordDate = dateList[dateIdx];

  const [morningSystolic, setMorningSystolic] = useState('');
  const [morningDiastolic, setMorningDiastolic] = useState('');
  const [eveningSystolic, setEveningSystolic] = useState('');
  const [eveningDiastolic, setEveningDiastolic] = useState('');
  const [weight, setWeight] = useState('');
  const [bloodSugar, setBloodSugar] = useState('');
  const [fluidIntake, setFluidIntake] = useState('');
  const [urineOutput, setUrineOutput] = useState('');
  const [notes, setNotes] = useState('');
  const [submitting, setSubmitting] = useState(false);

  // ── Collapsible sections ──
  const [collapsed, setCollapsed] = useState<Record<SectionKey, boolean>>({
    morning: false,
    evening: false,
    other: true,
  });

  const toggleSection = (key: SectionKey) => {
    setCollapsed(prev => ({ ...prev, [key]: !prev[key] }));
  };

  useDidShow(() => {
    Taro.setNavigationBarTitle({ title: '日常监测上报' });
  });

  const resetForm = () => {
    setMorningSystolic('');
    setMorningDiastolic('');
    setEveningSystolic('');
    setEveningDiastolic('');
    setWeight('');
    setBloodSugar('');
    setFluidIntake('');
    setUrineOutput('');
    setNotes('');
  };

  // ── Abnormal field gathering for submit confirmation ──
  const gatherAbnormalFields = (): string[] => {
    const abnormalFields: string[] = [];

    const checks: Array<[string, string]> = [
      ['morningSystolic', morningSystolic],
      ['morningDiastolic', morningDiastolic],
      ['eveningSystolic', eveningSystolic],
      ['eveningDiastolic', eveningDiastolic],
      ['bloodSugar', bloodSugar],
    ];

    for (const [field, value] of checks) {
      const result = checkAbnormal(value, field);
      if (result.abnormal) {
        abnormalFields.push(FIELD_LABELS[field]);
      }
    }

    return abnormalFields;
  };

  const handleSubmit = async () => {
    if (!currentPatient) {
      Taro.showToast({ title: '请先选择就诊人', icon: 'none' });
      return;
    }

    const hasData =
      morningSystolic || morningDiastolic ||
      eveningSystolic || eveningDiastolic ||
      weight || bloodSugar || fluidIntake || urineOutput;

    if (!hasData) {
      Taro.showToast({ title: '请至少填写一项数据', icon: 'none' });
      return;
    }

    if ((morningSystolic && !morningDiastolic) || (!morningSystolic && morningDiastolic)) {
      Taro.showToast({ title: '晨起血压请同时填写收缩压和舒张压', icon: 'none' });
      return;
    }
    if ((eveningSystolic && !eveningDiastolic) || (!eveningSystolic && eveningDiastolic)) {
      Taro.showToast({ title: '晚间血压请同时填写收缩压和舒张压', icon: 'none' });
      return;
    }

    const parseNum = (v: string) => v ? parseFloat(v) : undefined;
    const fields = {
      morningSystolic: parseNum(morningSystolic),
      morningDiastolic: parseNum(morningDiastolic),
      eveningSystolic: parseNum(eveningSystolic),
      eveningDiastolic: parseNum(eveningDiastolic),
      weight: parseNum(weight),
      bloodSugar: parseNum(bloodSugar),
      fluidIntake: parseNum(fluidIntake),
      urineOutput: parseNum(urineOutput),
    };

    const validations: Array<[z.ZodTypeAny, number | undefined, string]> = [
      [bpSchema, fields.morningSystolic, '晨起收缩压'],
      [bpSchema, fields.morningDiastolic, '晨起舒张压'],
      [bpSchema, fields.eveningSystolic, '晚间收缩压'],
      [bpSchema, fields.eveningDiastolic, '晚间舒张压'],
      [weightSchema, fields.weight, '体重'],
      [bloodSugarSchema, fields.bloodSugar, '血糖'],
      [volumeSchema, fields.fluidIntake, '饮水量'],
      [volumeSchema, fields.urineOutput, '尿量'],
    ];

    for (const [schema, value, label] of validations) {
      if (value !== undefined) {
        const result = schema.safeParse(value);
        if (!result.success) {
          Taro.showToast({ title: `${label}: ${result.error.errors[0].message}`, icon: 'none' });
          return;
        }
      }
    }

    // ── Pre-submit abnormal confirmation ──
    const abnormalFields = gatherAbnormalFields();
    if (abnormalFields.length > 0) {
      const confirmed = await Taro.showModal({
        title: '数值异常提醒',
        content: `以下指标超出正常范围：${abnormalFields.join('、')}。确认提交？`,
        confirmText: '确认提交',
        cancelText: '返回修改',
      });
      if (!confirmed.confirm) return;
    }

    setSubmitting(true);
    try {
      await createDailyMonitoring({
        patient_id: currentPatient.id,
        record_date: recordDate,
        morning_bp_systolic: morningSystolic ? parseFloat(morningSystolic) : undefined,
        morning_bp_diastolic: morningDiastolic ? parseFloat(morningDiastolic) : undefined,
        evening_bp_systolic: eveningSystolic ? parseFloat(eveningSystolic) : undefined,
        evening_bp_diastolic: eveningDiastolic ? parseFloat(eveningDiastolic) : undefined,
        weight: weight ? parseFloat(weight) : undefined,
        blood_sugar: bloodSugar ? parseFloat(bloodSugar) : undefined,
        fluid_intake: fluidIntake ? parseFloat(fluidIntake) : undefined,
        urine_output: urineOutput ? parseFloat(urineOutput) : undefined,
        notes: notes || undefined,
      });

      trackEvent('daily_monitoring_submit', { date: recordDate });
      useHealthStore.getState().clearCache();
      clearRequestCache('/health/');
      usePointsStore.getState().invalidate();
      Taro.showToast({ title: '上报成功', icon: 'success' });

      setTimeout(() => {
        Taro.showToast({ title: '+10 健康积分', icon: 'none', duration: 1500 });
      }, 1600);

      setTimeout(() => {
        Taro.navigateBack();
      }, 3200);
    } catch (e: unknown) {
      const msg = e instanceof Error ? e.message : '上报失败';
      if (msg.includes('已有记录') || msg.includes('already exists')) {
        Taro.showModal({
          title: '提示',
          content: '该日期已有监测记录，请选择其他日期',
          showCancel: false,
        });
      } else {
        Taro.showToast({ title: msg, icon: 'none' });
      }
    } finally {
      setSubmitting(false);
    }
  };

  const isToday = recordDate === today;

  // ── Abnormal state helpers for rendering ──
  const morningSysAbnormal = checkAbnormal(morningSystolic, 'systolic');
  const morningDiaAbnormal = checkAbnormal(morningDiastolic, 'diastolic');
  const eveningSysAbnormal = checkAbnormal(eveningSystolic, 'systolic');
  const eveningDiaAbnormal = checkAbnormal(eveningDiastolic, 'diastolic');
  const bloodSugarAbnormal = checkAbnormal(bloodSugar, 'bloodSugar');

  return (
    <View className={`dm-page ${modeClass}`}>
      {/* 页面标题 */}
      <View className='dm-hero'>
        <View className='dm-hero-icon'>
          <Text className='dm-hero-icon-text'>记</Text>
        </View>
        <Text className='dm-hero-title'>日常监测</Text>
        <Text className='dm-hero-sub'>每日健康数据上报</Text>
      </View>

      {/* 日期选择 (standalone card) */}
      <View className='dm-card'>
        <View className='dm-card-header'>
          <Text className='dm-card-title'>记录日期</Text>
          {isToday && (
            <Text className='dm-card-badge'>今日</Text>
          )}
        </View>
        <Picker
          mode='selector'
          range={dateList}
          value={dateIdx}
          onChange={(e) => setDateIdx(Number(e.detail.value))}
        >
          <View className='dm-date-row'>
            <Text className='dm-date-value'>{recordDate}</Text>
            <Text className='dm-date-arrow'>V</Text>
          </View>
        </Picker>
      </View>

      {/* ── Group 1: 晨间体征 (default open) ── */}
      <View className={`dm-group${collapsed.morning ? ' dm-group-collapsed' : ''}`}>
        <View className='dm-group-header' onClick={() => toggleSection('morning')}>
          <Text className='dm-group-title'>晨间体征</Text>
          <Text className={`dm-group-arrow${collapsed.morning ? '' : ' dm-group-arrow-open'}`}>&#9656;</Text>
        </View>
        <View className='dm-group-body'>
          <View className='dm-bp-group'>
            <View className='dm-bp-field'>
              <Text className='dm-field-label'>收缩压</Text>
              <Input
                type='digit'
                className={`dm-input-box${morningSysAbnormal.abnormal ? ' dm-input-abnormal' : ''}`}
                placeholder='如 120'
                value={morningSystolic}
                onInput={(e) => setMorningSystolic(e.detail.value)}
              />
              {morningSysAbnormal.abnormal && (
                <Text className={`dm-field-warning${morningSysAbnormal.direction === 'low' ? ' dm-field-warning-low' : ''}`}>
                  {morningSysAbnormal.direction === 'high' ? '偏高' : '偏低'}
                </Text>
              )}
            </View>
            <View className='dm-bp-divider'>
              <View className='dm-bp-line' />
              <Text className='dm-bp-slash'>/</Text>
              <View className='dm-bp-line' />
            </View>
            <View className='dm-bp-field'>
              <Text className='dm-field-label'>舒张压</Text>
              <Input
                type='digit'
                className={`dm-input-box${morningDiaAbnormal.abnormal ? ' dm-input-abnormal' : ''}`}
                placeholder='如 80'
                value={morningDiastolic}
                onInput={(e) => setMorningDiastolic(e.detail.value)}
              />
              {morningDiaAbnormal.abnormal && (
                <Text className={`dm-field-warning${morningDiaAbnormal.direction === 'low' ? ' dm-field-warning-low' : ''}`}>
                  {morningDiaAbnormal.direction === 'high' ? '偏高' : '偏低'}
                </Text>
              )}
            </View>
          </View>
          <Text className='dm-field-unit'>mmHg</Text>
        </View>
      </View>

      {/* ── Group 2: 晚间体征 (default open) ── */}
      <View className={`dm-group${collapsed.evening ? ' dm-group-collapsed' : ''}`}>
        <View className='dm-group-header' onClick={() => toggleSection('evening')}>
          <Text className='dm-group-title'>晚间体征</Text>
          <Text className={`dm-group-arrow${collapsed.evening ? '' : ' dm-group-arrow-open'}`}>&#9656;</Text>
        </View>
        <View className='dm-group-body'>
          <View className='dm-bp-group'>
            <View className='dm-bp-field'>
              <Text className='dm-field-label'>收缩压</Text>
              <Input
                type='digit'
                className={`dm-input-box${eveningSysAbnormal.abnormal ? ' dm-input-abnormal' : ''}`}
                placeholder='如 120'
                value={eveningSystolic}
                onInput={(e) => setEveningSystolic(e.detail.value)}
              />
              {eveningSysAbnormal.abnormal && (
                <Text className={`dm-field-warning${eveningSysAbnormal.direction === 'low' ? ' dm-field-warning-low' : ''}`}>
                  {eveningSysAbnormal.direction === 'high' ? '偏高' : '偏低'}
                </Text>
              )}
            </View>
            <View className='dm-bp-divider'>
              <View className='dm-bp-line' />
              <Text className='dm-bp-slash'>/</Text>
              <View className='dm-bp-line' />
            </View>
            <View className='dm-bp-field'>
              <Text className='dm-field-label'>舒张压</Text>
              <Input
                type='digit'
                className={`dm-input-box${eveningDiaAbnormal.abnormal ? ' dm-input-abnormal' : ''}`}
                placeholder='如 80'
                value={eveningDiastolic}
                onInput={(e) => setEveningDiastolic(e.detail.value)}
              />
              {eveningDiaAbnormal.abnormal && (
                <Text className={`dm-field-warning${eveningDiaAbnormal.direction === 'low' ? ' dm-field-warning-low' : ''}`}>
                  {eveningDiaAbnormal.direction === 'high' ? '偏高' : '偏低'}
                </Text>
              )}
            </View>
          </View>
          <Text className='dm-field-unit'>mmHg</Text>
        </View>
      </View>

      {/* ── Group 3: 其他指标 (default collapsed) ── */}
      <View className={`dm-group${collapsed.other ? ' dm-group-collapsed' : ''}`}>
        <View className='dm-group-header' onClick={() => toggleSection('other')}>
          <Text className='dm-group-title'>其他指标</Text>
          <Text className={`dm-group-arrow${collapsed.other ? '' : ' dm-group-arrow-open'}`}>&#9656;</Text>
        </View>
        <View className='dm-group-body'>
          {/* 体重 */}
          <View className='dm-inner-field'>
            <Text className='dm-field-label'>体重</Text>
            <View className='dm-single-row'>
              <Input
                type='digit'
                className='dm-input-box dm-input-flex'
                placeholder='如 65.0'
                value={weight}
                onInput={(e) => setWeight(e.detail.value)}
              />
              <Text className='dm-unit-inline'>kg</Text>
            </View>
          </View>

          {/* 血糖 */}
          <View className='dm-inner-field'>
            <Text className='dm-field-label'>血糖</Text>
            <View className='dm-single-row'>
              <Input
                type='digit'
                className={`dm-input-box dm-input-flex${bloodSugarAbnormal.abnormal ? ' dm-input-abnormal' : ''}`}
                placeholder='如 5.6'
                value={bloodSugar}
                onInput={(e) => setBloodSugar(e.detail.value)}
              />
              <Text className='dm-unit-inline'>mmol/L</Text>
            </View>
            {bloodSugarAbnormal.abnormal && (
              <Text className={`dm-field-warning${bloodSugarAbnormal.direction === 'low' ? ' dm-field-warning-low' : ''}`}>
                {bloodSugarAbnormal.direction === 'high' ? '偏高' : '偏低'}
              </Text>
            )}
          </View>

          {/* 饮水量 */}
          <View className='dm-inner-field'>
            <Text className='dm-field-label'>饮水量</Text>
            <View className='dm-single-row'>
              <Input
                type='digit'
                className='dm-input-box dm-input-flex'
                placeholder='如 2000'
                value={fluidIntake}
                onInput={(e) => setFluidIntake(e.detail.value)}
              />
              <Text className='dm-unit-inline'>ml</Text>
            </View>
          </View>

          {/* 尿量 */}
          <View className='dm-inner-field'>
            <Text className='dm-field-label'>尿量</Text>
            <View className='dm-single-row'>
              <Input
                type='digit'
                className='dm-input-box dm-input-flex'
                placeholder='如 1500'
                value={urineOutput}
                onInput={(e) => setUrineOutput(e.detail.value)}
              />
              <Text className='dm-unit-inline'>ml</Text>
            </View>
          </View>

          {/* 备注 */}
          <View className='dm-inner-field'>
            <Text className='dm-field-label'>备注</Text>
            <Input
              className='dm-input-box dm-input-full'
              placeholder='如：头晕、乏力等（可选）'
              value={notes}
              onInput={(e) => setNotes(e.detail.value)}
            />
          </View>
        </View>
      </View>

      {/* 提交 */}
      <View
        className={`dm-submit ${submitting ? 'dm-submit-disabled' : ''}`}
        onClick={submitting ? undefined : handleSubmit}
      >
        <Text className='dm-submit-text'>{submitting ? '提交中...' : '提交上报'}</Text>
      </View>

      {/* 重置 */}
      <View className='dm-reset' onClick={resetForm}>
        <Text className='dm-reset-text'>清空表单</Text>
      </View>
    </View>
  );
}