import * as echarts from '../../ec-canvas/echarts';

const app = getApp();

function setOption(chart) {
  const option = {
    tooltip: {
      trigger: 'axis',
      axisPointer: {            // 坐标轴指示器,坐标轴触发有效
        type: 'shadow'        // 默认为直线,可选为:'line' | 'shadow'
      }
    },
    legend: {
      data: ['热度', '正面', '负面']
    },
    grid: {
      left: 20,
      right: 20,
      bottom: 15,
      top: 40,
      containLabel: true
    },
    xAxis: [
      {
        type: 'value',
        axisLine: {
          lineStyle: {
            color: '#999'
          }
        },
        axisLabel: {
          color: '#666'
        }
      }
    ],
    yAxis: [
      {
        type: 'category',
        axisTick: { show: false },
        data: ['汽车之家', '今日头条', '百度贴吧', '一点资讯', '微信', '微博', '知乎'],
        axisLine: {
          lineStyle: {
            color: '#999'
          }
        },
        axisLabel: {
          color: '#666'
        }
      }
    ],
    series: [
      {
        name: '热度',
        type: 'bar',
        label: {
          normal: {
            show: true,
            position: 'inside'
          }
        },
        data: [300, 270, 340, 344, 300, 320, 310],
        itemStyle: {
          // emphasis: {
          //   color: '#37a2da'
          // }
        }
      },
      {
        name: '正面',
        type: 'bar',
        stack: '总量',
        label: {
          normal: {
            show: true
          }
        },
        data: [120, 102, 141, 174, 190, 250, 220],
        itemStyle: {
          // emphasis: {
          //   color: '#32c5e9'
          // }
        }
      },
      {
        name: '负面',
        type: 'bar',
        stack: '总量',
        label: {
          normal: {
            show: true,
            position: 'left'
          }
        },
        data: [-20, -32, -21, -34, -90, -130, -110],
        itemStyle: {
          // emphasis: {
          //   color: '#67e0e3'
          // }
        }
      }
    ]
  };
  chart.setOption(option);
}

Page({
  onShareAppMessage: res => {
    return {
      title: 'ECharts 可以在微信小程序中使用啦!',
      path: '/pages/index/index',
      success: function () { },
      fail: function () { }
    }
  },

  onReady: function () {
    // 获取组件
    this.ecComponent = this.selectComponent('#mychart-dom-bar');
  },

  data: {
    ec: {
      // 将 lazyLoad 设为 true 后,需要手动初始化图表
      lazyLoad: true
    },
    isLoaded: false,
    isDisposed: false
  },

  // 点击按钮后初始化图表
  init: function () {
    this.ecComponent.init((canvas, width, height, dpr) => {
      // 获取组件的 canvas、width、height 后的回调函数
      // 在这里初始化图表
      const chart = echarts.init(canvas, null, {
        width: width,
        height: height,
        devicePixelRatio: dpr // new
      });
      setOption(chart);

      // 将图表实例绑定到 this 上,可以在其他成员函数(如 dispose)中访问
      this.chart = chart;

      this.setData({
        isLoaded: true,
        isDisposed: false
      });

      // 注意这里一定要返回 chart 实例,否则会影响事件处理等
      return chart;
    });
  },

  dispose: function () {
    if (this.chart) {
      this.chart.dispose();
    }

    this.setData({
      isDisposed: true
    });
  }
});