const app = getApp();

Page({
  data: {
    // 基础数据
    ba: '', // 骨龄
    ca: '', // 实际年龄
    igf1: '', // IGF-1值
    igfbp3: '', // IGFBP-3值
    // 计算结果
    showResult: false,
    probability: null,
    calculationDetails: null,
    // 参考范围
    referenceRanges: {
      igf1: {
        male: [
          { ageRange: '0-1', min: 55, max: 327 },
          { ageRange: '1-3', min: 51, max: 303 },
          { ageRange: '3-5', min: 49, max: 289 },
          { ageRange: '5-7', min: 52, max: 297 },
          { ageRange: '7-9', min: 57, max: 316 },
          { ageRange: '9-11', min: 88, max: 474 },
          { ageRange: '11-13', min: 110, max: 565 },
          { ageRange: '13-15', min: 202, max: 957 },
          { ageRange: '15-17', min: 193, max: 731 }
        ],
        female: [
          { ageRange: '0-1', min: 55, max: 327 },
          { ageRange: '1-3', min: 51, max: 303 },
          { ageRange: '3-5', min: 49, max: 289 },
          { ageRange: '5-7', min: 52, max: 297 },
          { ageRange: '7-9', min: 57, max: 316 },
          { ageRange: '9-11', min: 88, max: 474 },
          { ageRange: '11-13', min: 183, max: 850 },
          { ageRange: '13-15', min: 261, max: 1096 },
          { ageRange: '15-17', min: 238, max: 996 }
        ]
      },
      igfbp3: {
        male: [
          { ageRange: '0-1', min: 0.7, max: 3.6 },
          { ageRange: '1-3', min: 0.8, max: 3.9 },
          { ageRange: '3-5', min: 0.9, max: 4.3 },
          { ageRange: '5-7', min: 1.0, max: 4.7 },
          { ageRange: '7-9', min: 1.1, max: 5.2 },
          { ageRange: '9-11', min: 1.3, max: 5.6 },
          { ageRange: '11-13', min: 1.4, max: 6.1 },
          { ageRange: '13-15', min: 1.6, max: 6.8 },
          { ageRange: '15-17', min: 1.8, max: 7.1 }
        ],
        female: [
          { ageRange: '0-1', min: 0.7, max: 3.6 },
          { ageRange: '1-3', min: 0.8, max: 3.9 },
          { ageRange: '3-5', min: 0.9, max: 4.3 },
          { ageRange: '5-7', min: 1.0, max: 4.7 },
          { ageRange: '7-9', min: 1.1, max: 5.2 },
          { ageRange: '9-11', min: 1.3, max: 5.6 },
          { ageRange: '11-13', min: 1.5, max: 6.3 },
          { ageRange: '13-15', min: 1.7, max: 7.3 },
          { ageRange: '15-17', min: 1.9, max: 7.9 }
        ]
      }
    }
  },

  // 输入处理
  inputBA(e) {
    // 只允许输入数字和小数点
    const value = e.detail.value.replace(/[^\d.]/g, '');
    // 确保只有一个小数点
    const formattedValue = value.replace(/\.+/g, '.');
    this.setData({ ba: formattedValue });
  },

  inputCA(e) {
    const value = e.detail.value.replace(/[^\d.]/g, '');
    const formattedValue = value.replace(/\.+/g, '.');
    this.setData({ ca: formattedValue });
  },

  inputIGF1(e) {
    const value = e.detail.value.replace(/[^\d.]/g, '');
    const formattedValue = value.replace(/\.+/g, '.');
    this.setData({ igf1: formattedValue });
  },

  inputIGFBP3(e) {
    const value = e.detail.value.replace(/[^\d.]/g, '');
    const formattedValue = value.replace(/\.+/g, '.');
    this.setData({ igfbp3: formattedValue });
  },

  // 计算GHD概率
  calculate() {
    const { ba, ca, igf1, igfbp3 } = this.data;
    
    // 输入验证
    if (!this.validateInput()) return;

    try {
      // 将字符串转换为数字
      const baNum = parseFloat(ba);
      const caNum = parseFloat(ca);
      const igf1Num = parseFloat(igf1);
      const igfbp3Num = parseFloat(igfbp3);
      
      // 计算 BA-CA
      const baCaDiff = baNum - caNum;
      
      // 计算 Y = LN(P/1-P)
      const y = this.calculateY(baCaDiff, igf1Num, igfbp3Num);
      
      // 计算概率 P
      const p = this.calculateProbability(y);

      // 计算各因素的贡献
      const contributions = this.calculateContributions(baCaDiff, igf1Num, igfbp3Num);

      // 显示结果
      this.setData({
        showResult: true,
        probability: p,
        calculationDetails: {
          steps: [
            `步骤1：设置方程右边为 Y`,
            `Y = 3.726 - 0.876×(BA-CA) - 0.058×(IGF-1) + 0.229×(IGFBP-3)`,
            `Y = 3.726 - 0.876×(${baNum.toFixed(2)} - ${caNum.toFixed(2)}) - 0.058×${igf1Num.toFixed(2)} + 0.229×${igfbp3Num.toFixed(2)}`,
            `Y = 3.726 - 0.876×(${baCaDiff.toFixed(2)}) - 0.058×${igf1Num.toFixed(2)} + 0.229×${igfbp3Num.toFixed(2)}`,
            `Y = 3.726 - ${(0.876 * baCaDiff).toFixed(4)} - ${(0.058 * igf1Num).toFixed(4)} + ${(0.229 * igfbp3Num).toFixed(4)}`,
            `Y = ${y.toFixed(4)}`,
            ``,
            `步骤2：解指数方程`,
            `P/(1-P) = e^Y`,
            `P/(1-P) = e^${y.toFixed(4)}`,
            `P/(1-P) = ${Math.exp(y).toFixed(4)}`,
            ``,
            `步骤3：求概率 P`,
            `P = e^Y / (1 + e^Y)`,
            `P = ${p.toFixed(4)}`,
            ``,
            `GHD预测概率：${(p * 100).toFixed(2)}%`
          ].join('\n'),
          interpretation: this.getInterpretation(p)
        }
      });

    } catch (error) {
      wx.showToast({
        title: error.message || '计算失败',
        icon: 'none'
      });
    }
  },

  // 输入验证
  validateInput() {
    const { ba, ca, igf1, igfbp3 } = this.data;
    
    if (!ba || !ca || !igf1 || !igfbp3) {
      wx.showToast({
        title: '请填写完整信息',
        icon: 'none'
      });
      return false;
    }

    // 验证输入是否为有效数字
    const baNum = parseFloat(ba);
    const caNum = parseFloat(ca);
    const igf1Num = parseFloat(igf1);
    const igfbp3Num = parseFloat(igfbp3);
    
    if (isNaN(baNum) || isNaN(caNum) || isNaN(igf1Num) || isNaN(igfbp3Num)) {
      wx.showToast({
        title: '请输入有效数字',
        icon: 'none'
      });
      return false;
    }

    // 验证数值范围
    if (baNum <= 0 || caNum <= 0) {
      wx.showToast({
        title: '年龄必须大于0',
        icon: 'none'
      });
      return false;
    }

    return true;
  },

  // 计算Y值
  calculateY(baCaDiff, igf1, igfbp3) {
    return 3.726 - 0.876 * baCaDiff - 0.058 * igf1 + 0.229 * igfbp3;
  },

  // 计算概率
  calculateProbability(y) {
    const expY = Math.exp(y);
    return expY / (1 + expY);
  },

  // 计算各因素的贡献
  calculateContributions(baCaDiff, igf1, igfbp3) {
    // Implementation of calculateContributions method
  },

  // 获取解释文本
  getInterpretation(p) {
    const percentage = (p * 100).toFixed(2);
    let interpretation = `预测结果显示该患者患有GHD的概率为${percentage}%\n\n`;
    
    if (p >= 0.8) {
      interpretation += '预测结果提示GHD可能性较大，建议进一步进行相关检查。';
    } else if (p >= 0.5) {
      interpretation += '预测结果提示存在GHD可能，建议进行相关检查。';
    } else {
      interpretation += '预测结果提示GHD可能性较小，但仍需结合临床表现进行综合判断。';
    }
    
    return interpretation;
  },

  // 重置表单
  reset() {
    this.setData({
      ba: '',
      ca: '',
      igf1: '',
      igfbp3: '',
      showResult: false,
      probability: null,
      calculationDetails: null
    });
  },

  // 返回上一页
  onClickLeft() {
    wx.navigateBack();
  }
});