import PropTypes from '../_util/vue-types'
import BaseMixin from '../_util/BaseMixin'
import moment from 'moment'
import { getComponentFromProp } from '../_util/props-util'

const Header = {
  mixins: [BaseMixin],
  props: {
    format: PropTypes.string,
    prefixCls: PropTypes.string,
    disabledDate: PropTypes.func,
    placeholder: PropTypes.string,
    clearText: PropTypes.string,
    value: PropTypes.object,
    inputReadOnly: PropTypes.bool.def(false),
    hourOptions: PropTypes.array,
    minuteOptions: PropTypes.array,
    secondOptions: PropTypes.array,
    disabledHours: PropTypes.func,
    disabledMinutes: PropTypes.func,
    disabledSeconds: PropTypes.func,
    // onChange: PropTypes.func,
    // onClear: PropTypes.func,
    // onEsc: PropTypes.func,
    allowEmpty: PropTypes.bool,
    defaultOpenValue: PropTypes.object,
    currentSelectPanel: PropTypes.string,
    focusOnOpen: PropTypes.bool,
    // onKeyDown: PropTypes.func,
    showStr: PropTypes.bool.def(true),
    clearIcon: PropTypes.any,
  },
  data () {
    const { value, format } = this
    return {
      str: value && value.format(format) || '',
      invalid: false,
    }
  },

  mounted () {
    if (this.focusOnOpen) {
      // Wait one frame for the panel to be positioned before focusing
      const requestAnimationFrame = (window.requestAnimationFrame || window.setTimeout)
      requestAnimationFrame(() => {
        this.$refs.input.focus()
        this.$refs.input.select()
      })
    }
  },
  watch: {
    '$props': {
      handler: function (nextProps) {
        const { value, format } = nextProps
        this.setState({
          str: value && value.format(format) || '',
          invalid: false,
        })
      },
      deep: true,
    },
  },

  methods: {
    onInputChange (event) {
      const str = event.target.value
      this.showStr = true
      this.setState({
        str,
      })
      const {
        format, hourOptions, minuteOptions, secondOptions,
        disabledHours, disabledMinutes,
        disabledSeconds, allowEmpty,
        value: originalValue,
      } = this

      if (str) {
        const value = this.getProtoValue().clone()
        const parsed = moment(str, format, true)
        if (!parsed.isValid()) {
          this.setState({
            invalid: true,
          })
          return
        }
        value.hour(parsed.hour()).minute(parsed.minute()).second(parsed.second())

        // if time value not allowed, response warning.
        if (
          hourOptions.indexOf(value.hour()) < 0 ||
        minuteOptions.indexOf(value.minute()) < 0 ||
        secondOptions.indexOf(value.second()) < 0
        ) {
          this.setState({
            invalid: true,
          })
          return
        }

        // if time value is disabled, response warning.
        const disabledHourOptions = disabledHours()
        const disabledMinuteOptions = disabledMinutes(value.hour())
        const disabledSecondOptions = disabledSeconds(value.hour(), value.minute())
        if (
          (disabledHourOptions && disabledHourOptions.indexOf(value.hour()) >= 0) ||
        (disabledMinuteOptions && disabledMinuteOptions.indexOf(value.minute()) >= 0) ||
        (disabledSecondOptions && disabledSecondOptions.indexOf(value.second()) >= 0)
        ) {
          this.setState({
            invalid: true,
          })
          return
        }

        if (originalValue) {
          if (
            originalValue.hour() !== value.hour() ||
          originalValue.minute() !== value.minute() ||
          originalValue.second() !== value.second()
          ) {
          // keep other fields for rc-calendar
            const changedValue = originalValue.clone()
            changedValue.hour(value.hour())
            changedValue.minute(value.minute())
            changedValue.second(value.second())
            this.__emit('change', changedValue)
          }
        } else if (originalValue !== value) {
          this.__emit('change', value)
        }
      } else if (allowEmpty) {
        this.__emit('change', null)
      } else {
        this.setState({
          invalid: true,
        })
        return
      }

      this.setState({
        invalid: false,
      })
    },

    onKeyDown (e) {
      if (e.keyCode === 27) {
        this.__emit('esc')
      }
      this.__emit('keydown', e)
    },

    onClear () {
      this.__emit('clear')
      this.setState({ str: '' })
    },

    getClearButton () {
      const { prefixCls, allowEmpty, clearText } = this
      const clearIcon = getComponentFromProp(this, 'clearIcon')
      if (!allowEmpty) {
        return null
      }
      return (
        <a
          role='button'
          class={`${prefixCls}-clear-btn`}
          title={clearText}
          onMousedown={this.onClear}
        >
          {clearIcon || <i class={`${prefixCls}-clear-btn-icon`} />}
        </a>
      )
    },

    getProtoValue () {
      return this.value || this.defaultOpenValue
    },

    getInput () {
      const { prefixCls, placeholder, inputReadOnly, invalid, str, showStr } = this
      const invalidClass = invalid ? `${prefixCls}-input-invalid` : ''
      return (
        <input
          class={`${prefixCls}-input ${invalidClass}`}
          ref='input'
          onKeydown={this.onKeyDown}
          value={showStr ? str : ''}
          placeholder={placeholder}
          onInput={this.onInputChange}
          readOnly={!!inputReadOnly}
        />
      )
    },
  },

  render () {
    const { prefixCls } = this
    return (
      <div class={`${prefixCls}-input-wrap`}>
        {this.getInput()}
        {this.getClearButton()}
      </div>
    )
  },
}

export default Header