import React, { useCallback, useEffect, useState } from 'react';
import { Button, Image, Radio, RadioGroup, ScrollView, Text, View } from '@tarojs/components';
import Taro, { usePullDownRefresh } from '@tarojs/taro';
import styles from './index.module.scss';
import {
  listLampSteps,
  listLampTests,
  updateLampResult,
  updateLampStep,
  uploadLampResultImage,
  type LampTest,
  type LampTestStep,
} from '@/api/lamp';
import { formatRelativeTime } from '@/utils/format';

const STATUS_LABELS: Record<string, string> = {
  pending: '待检测',
  testing: '检测中',
  resulted: '已出结果',
};

const RESULT_LABELS: Record<string, string> = {
  positive: '阳性',
  negative: '阴性',
  invalid: '无效',
};

const METHOD_LABELS: Record<string, string> = {
  lamp: 'LAMP',
  qpcr: 'qPCR',
  sers: 'SERS',
  hyperspectral: '高光谱',
};

const LampPage: React.FC = () => {
  const [tests, setTests] = useState<LampTest[]>([]);
  const [stepsMap, setStepsMap] = useState<Record<string, LampTestStep[]>>({});
  const [expandedId, setExpandedId] = useState('');
  const [result, setResult] = useState('');
  const [loading, setLoading] = useState(true);

  const fetchData = useCallback(async () => {
    try {
      const list = await listLampTests().catch(() => [] as LampTest[]);
      setTests(list);
      const map: Record<string, LampTestStep[]> = {};
      await Promise.all(
        list.map(async (t) => {
          map[t.id] = await listLampSteps(t.id).catch(() => [] as LampTestStep[]);
        }),
      );
      setStepsMap(map);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    fetchData();
  }, [fetchData]);

  usePullDownRefresh(() => {
    fetchData().then(() => Taro.stopPullDownRefresh());
  });

  const toggleExpand = (t: LampTest) => {
    if (expandedId === t.id) {
      setExpandedId('');
      return;
    }
    setExpandedId(t.id);
    setResult(t.result || '');
  };

  const handleStepToggle = async (t: LampTest, s: LampTestStep, done: boolean) => {
    await updateLampStep(t.id, s.stepNo, done);
    setStepsMap((prev) => ({
      ...prev,
      [t.id]: (prev[t.id] || []).map((x) => (x.stepNo === s.stepNo ? { ...x, done } : x)),
    }));
  };

  const handleChooseImage = (t: LampTest) => {
    Taro.chooseImage({
      count: 1,
      sizeType: ['compressed'],
      success: async (res) => {
        const path = res.tempFilePaths[0];
        try {
          const up = await uploadLampResultImage(t.id, path);
          setTests((prev) =>
            prev.map((x) => (x.id === t.id ? { ...x, resultImageUrl: up.url } : x)),
          );
          Taro.showToast({ title: '照片已上传', icon: 'success' });
        } catch (err) {
          Taro.showToast({
            title: err instanceof Error ? err.message : '上传失败',
            icon: 'none',
          });
        }
      },
    });
  };

  const handleSaveResult = async (t: LampTest) => {
    if (!result) {
      Taro.showToast({ title: '请选择检测结果', icon: 'none' });
      return;
    }
    await updateLampResult(t.id, result);
    Taro.showToast({ title: '结果已保存', icon: 'success' });
    fetchData();
  };

  return (
    <ScrollView className={styles.page} scrollY>
      {tests.map((t) => {
        const steps = stepsMap[t.id] || [];
        const doneCount = steps.filter((s) => s.done).length;
        const expanded = expandedId === t.id;
        return (
          <View key={t.id} className={styles.card}>
            <View className={styles.cardHeader} onClick={() => toggleExpand(t)}>
              <View className={styles.cardInfo}>
                <Text className={styles.cardTitle}>{(t.diseases || []).join('、') || 'LAMP 检测'}</Text>
                <Text className={styles.cardMeta}>
                  {METHOD_LABELS[t.method || 'lamp']} · {STATUS_LABELS[t.status] || t.status}
                  {t.sampleInfo ? ` · ${t.sampleInfo}` : ''} · {formatRelativeTime(t.createdAt)}
                </Text>
              </View>
              <Text className={styles.cardArrow}>{expanded ? '▲' : '▼'}</Text>
            </View>
            {expanded ? (
              <View className={styles.cardBody}>
                <Text className={styles.sectionLabel}>操作步骤（{doneCount}/{steps.length}）</Text>
                {steps.map((s) => (
                  <View key={s.id} className={styles.stepRow} onClick={() => handleStepToggle(t, s, !s.done)}>
                    <Text className={styles.stepName}>
                      {s.done ? '✅' : '⬜'} {s.stepNo}. {s.name}
                    </Text>
                  </View>
                ))}

                <Text className={styles.sectionLabel}>结果照片</Text>
                <View className={styles.photoRow}>
                  {t.resultImageUrl ? (
                    <Image className={styles.photo} src={t.resultImageUrl} mode="widthFix" />
                  ) : null}
                  <Button className={styles.btn} onClick={() => handleChooseImage(t)}>
                    拍照上传
                  </Button>
                </View>

                <Text className={styles.sectionLabel}>检测结果（天蓝=阳性，紫罗兰=阴性）</Text>
                <RadioGroup onChange={(e) => setResult(e.detail.value[0])}>
                  <View className={styles.radioRow}>
                    <Radio value="positive" checked={result === 'positive'}>阳性</Radio>
                    <Radio value="negative" checked={result === 'negative'}>阴性</Radio>
                    <Radio value="invalid" checked={result === 'invalid'}>无效</Radio>
                  </View>
                </RadioGroup>
                {t.result ? <Text className={styles.resultHint}>当前结果：{RESULT_LABELS[t.result]}</Text> : null}
                {t.crossStatus && t.crossStatus !== 'pending' ? (
                  <Text className={t.crossStatus === 'consistent' ? styles.crossOk : styles.crossWarn}>
                    {t.crossStatus === 'consistent'
                      ? '交叉验证：一致（确认诊断）✓'
                      : `交叉验证：不一致 ⚠ ${t.crossReason || '建议专家会诊'}`}
                  </Text>
                ) : null}
                <Button className={`${styles.btn} ${styles.btnPrimary}`} onClick={() => handleSaveResult(t)}>
                  保存结果
                </Button>
              </View>
            ) : null}
          </View>
        );
      })}
      {!loading && tests.length === 0 ? (
        <Text className={styles.emptyText}>暂无检测任务单</Text>
      ) : null}
    </ScrollView>
  );
};

export default LampPage;