class eventBinding {
  constructor() {
    this.element = {}
  }
  static event = {}

  getEvent(name) {
    return eventBinding.event[name]
  }

  getEventAll() {
    return eventBinding.event
  }

  setEvent(name, event) {
    eventBinding.event[name] = event
  }

  on(that, elements) {
    for (let i = 0; i < elements.length; i++) {
      let Event = []
      let isEvent = false
      let removeName = []
      if (!elements[i] ||!elements[i].attributes) {
        continue 
      }
      for (let m of elements[i].attributes) {
        switch (m.name) {
          case '@model': {
            isEvent = true
            if (elements[i].type == 'checkbox') {
              Event.push((e) => { that[m.value] = e.target.checked })
              elements[i].checked = that[m.value]
            }
            else {
              Event.push((e) => {
                let value = e.target.value
                if (e.target.type == 'number') {
                  if (e.data != '.' && (e.data != '-' || e.target.value)) {
                    value = Number(value)
                    if((e.target.max) && value>Number(e.target.max)) {
                      value = Number(e.target.max)
                    }
                    if((e.target.min) && value<Number(e.target.min)) {
                      value = Number(e.target.min)
                    }
                    if((e.target.dataset.min) && value<Number(e.target.dataset.min)) {
                      value = Number(e.target.dataset.min)
                    }
                    that[m.value] = value
                  }
                }
                else {
                  that[m.value] = value
                }
              })
              if(elements[i].nodeName=='IMG') {
                elements[i].src = that[m.value]
              }
              else {
                elements[i].value = that[m.value]
              }
            }
            if(this.element[m.value]) {
              this.element[m.value].push(elements[i])
            }
            else {
              this.element[m.value] = [elements[i]]
            }
            removeName.push(m.name)
            break;
          }
          case '@click': {
            elements[i].addEventListener('click', (e) => {
              if (typeof (that[m.value]) === 'function') {
                that[m.value](e)
              }
            });
            removeName.push(m.name)
            // elements[i].attributes.removeNamedItem(m.name)
            break;
          }
          case '@change': {
            isEvent = true
            Event.push((e) => {
              let value = e.target.value
              if(e.target.type == 'number' && value!='') {
                value = Number(value)
                e.target.value = value
              }
              if (typeof (that[m.value]) === 'function') {
                that[m.value](e, value)
              }
            })
            break;
          }
        }
        // elements[i].attributes[m] = undefined
      }
      for(let n=0;n<removeName.length;n++) {
        elements[i].attributes.removeNamedItem(removeName[n])
      }

      if (isEvent) {
        let ventType = 'input'
        if (elements[i].tagName != 'INPUT' || elements[i].type == 'checkbox') {
          ventType = 'change'
        }
        elements[i].addEventListener(ventType, (e) => {
          for (let t = 0; t < Event.length; t++) {
            Event[t](e)
          }
        });
      }
    }
  }
}

const EventBinding = new eventBinding();
export default EventBinding;