<template>
  <div :class="[
    type === 'textarea' ? 'el-textarea' : 'el-input',
    inputSize ? 'el-input--' + inputSize : '',
    {
      'is-disabled': inputDisabled,
      'is-exceed': inputExceed,
      'el-input-group': $slots.prepend || $slots.append,
      'el-input-group--append': $slots.append,
      'el-input-group--prepend': $slots.prepend,
      'is-focus': readonly ? '' : focused,
      'el-input--prefix': $slots.prefix || prefixIcon,
      'el-input--suffix': $slots.suffix || suffixIcon || clearable || showPassword || $slots.steps,
      'el-input--show-word': showWordLimit,
      'is-readable': readable || (elForm || {}).readable ? inputDisabled : '',
      'suffix-input': $slots.suffix || suffixIcon
    }
    ]"
    @mouseenter="hovering = true"
    @mouseleave="hovering = false"
  >
    <!-- 为了判断是否失焦 -->
    <div class="el-input__wrap" :class="[{'el-input__wrap--prepend': $slots.prepend}, {'el-input__wrap--append': $slots.append}, {'el-input__inner--hover': inputHovering && ($slots.prepend || $slots.append)}]" role="clickout" v-clickoutside="clickOut">
      <template v-if="type !== 'textarea'">
        <!-- 前置元素 -->
        <!-- 前置元素目前只考虑选择器这一种，包括prepend的样式都是为这一种情况服务的 -->
        <div class="el-input-group__prepend" v-if="$slots.prepend" @click="focused = false" @mouseenter="hovering = false" @mouseleave="hovering = true">
          <slot name="prepend"></slot>
        </div>
        <input
          :tabindex="tabindex"
          v-if="type !== 'textarea'"
          class="el-input__inner"
          :class="[
          {'input-clear': clearable && showClear && type !== 'textarea','input-border': iconHover && !inputDisabled && !focused && !iconfocused, 'is-readable': readable || (elForm || {}).readable ? inputDisabled : '' }
          ]"
          v-bind="$attrs"
          :type="showPassword ? (passwordVisible ? 'text': 'password') : type"
          :disabled="inputDisabled"
          :readonly="readonly"
          :autocomplete="autoComplete || autocomplete"
          ref="input"
          @keydown="handleKeydown"
          @compositionstart="handleCompositionStart"
          @compositionupdate="handleCompositionUpdate"
          @compositionend="handleCompositionEnd"
          @input="handleInput"
          @focus="handleFocus"
          @mouseover="inputHovering = true"
          @mouseleave="inputHovering = false"
          @blur="handleBlur"
          @change="handleChange"
          :aria-label="label"
        >
        <!-- 前置内容 -->
        <span class="el-input__prefix" v-if="$slots.prefix || prefixIcon" @mouseenter="hovering = false" @mouseleave="hovering = true">
          <i v-if="prefixIcon" :class="prefixIcon" class="el-input__icon"></i>
          <slot v-else name="prefix"></slot>
        </span>
        <!-- 后置内容 -->
        <div
          class="el-input__suffix"
          v-on:beforeinput="getSuffixVisible()"
          @mouseenter="iconHover = true"
          @mouseleave="iconHover = false"
          >
          <div class="el-input__suffix-inner" :class="[getSuffixVisible() ? '' : 'suffix-inner-padding',inputSize ? 'el-input__suffix-' + inputSize : '',]">
            <i
              v-if="showClear"
              class="el-input__icon el-icon-input-clear el-input__clear"
              @mousedown.prevent
              @click="clear"
              :style="{'marginRight': isWordLimitVisible || showPwdVisible || $slots.suffix || suffixIcon ? '12px' : ''}"
            ></i>
            <template v-if="( !showPwdVisible || !isWordLimitVisible)">
              <i v-if="suffixIcon" :class="suffixIcon" class="el-input__icon"></i>
              <slot v-else name="suffix"></slot>
            </template>
            <i v-if="showPwdVisible"
              class="el-input__icon el-icon-view el-input__clear"
              :class="passwordVisible ? 'el-icon-open-eyes' : 'el-icon-close-eyes'"
              @click="handlePasswordVisible"
              :style="{'marginRight': isWordLimitVisible ? '12px' : ''}"
            ></i>
            <span v-if="isWordLimitVisible" :class="{'el-input__count': true, 'el-input__character': inputDisabled}">
              <span class="el-input__count-inner">
                {{ textLength }}/{{ upperLimit }}
              </span>
            </span>
          </div>
          <i class="el-input__icon"
            v-if="validateState"
            :class="['el-input__validateIcon', validateIcon]">
          </i>
        </div>
        <!-- 后置元素 -->
        <div ref="append" class="el-input-group__append" v-if="$slots.append" @mouseenter="hovering = false" @mouseleave="hovering = true">
          <slot name="append"></slot>
        </div>
      </template>
      <textarea
        v-else
        :tabindex="tabindex"
        class="el-textarea__inner"
        @compositionstart="handleCompositionStart"
        @compositionupdate="handleCompositionUpdate"
        @compositionend="handleCompositionEnd"
        @input="handleInput"
        ref="textarea"
        v-bind="$attrs"
        :disabled="inputDisabled"
        :readonly="readonly"
        :autocomplete="autoComplete || autocomplete"
        :style="textareaStyle"
        @focus="handleFocus"
        @blur="handleBlur"
        @change="handleChange"
        :aria-label="label"
      >
      </textarea>
      <i v-if="showClear && type === 'textarea'"
        class="el-input__icon el-icon-input-clear el-input__clear"
        :class="[
          {'autosize-clear': autosize}
        ]"
        @mousedown.prevent
        @click="clear"
      ></i>
      <span v-if="isWordLimitVisible && type === 'textarea'" class="el-input__count" :style="{bottom: helper ? '25px' : '1px'}">{{ textLength }}/{{ upperLimit }}</span>
      <div v-if="helper" class="el-input__helper" v-html="helper"></div>
    </div>
  </div>
</template>
<script>
  import emitter from 'modesign-ui/src/mixins/emitter';
  import Migrating from 'modesign-ui/src/mixins/migrating';
  import calcTextareaHeight from './calcTextareaHeight';
  import merge from 'modesign-ui/src/utils/merge';
  import {isKorean} from 'modesign-ui/src/utils/shared';
  import Clickoutside from 'modesign-ui/src/utils/clickoutside';

  export default {
    name: 'ElInput',

    componentName: 'ElInput',

    mixins: [emitter, Migrating],

    inheritAttrs: false,

    inject: {
      elForm: {
        default: ''
      },
      elFormItem: {
        default: ''
      }
    },

    directives: { Clickoutside },

    data() {
      return {
        textareaCalcStyle: {},
        hovering: false,
        inputHovering: false,
        focused: false,
        isComposing: false,
        passwordVisible: false,
        iconfocused:true,
        // showWordLimit: false,
        iconHover: false,
      };
    },

    props: {
      value: [String, Number],
      size: String,
      resize: String,
      form: String,
      disabled: Boolean,
      readable: Boolean,
      readonly: {
        type: Boolean,
        default: () => false
      },
      type: {
        type: String,
        default: 'text'
      },
      autosize: {
        type: [Boolean, Object],
        default: false
      },
      autocomplete: {
        type: String,
        default: 'off'
      },
      /** @Deprecated in next major version */
      autoComplete: {
        type: String,
        validator(val) {
          process.env.NODE_ENV !== 'production' &&
            console.warn('[Scrm Warn][Input]\'auto-complete\' property will be deprecated in next major version. please use \'autocomplete\' instead.');
          return true;
        }
      },
      validateEvent: {
        type: Boolean,
        default: true
      },
      suffixIcon: String,
      prefixIcon: String,
      label: String,
      clearable: {
        type: Boolean,
        default: false
      },
      showPassword: {
        type: Boolean,
        default: false
      },
      showWordLimit: {
        type: Boolean,
        default: false
      },
      tabindex: String,
      helper: {
        type: String
      },
      inputLimit:{
        type:Boolean
      }
    },

    computed: {
			inputReadonly(){
				return this.readonly || (this.elForm || {}).readonly;
			},
      _elFormItemSize() {
        return (this.elFormItem || {}).elFormItemSize;
      },
      validateState() {
        return this.elFormItem ? this.elFormItem.validateState : '';
      },
      needStatusIcon() {
        return this.elForm ? this.elForm.statusIcon : false;
      },
      validateIcon() {
        return {
          validating: 'el-icon-loading',
          success: 'el-icon-circle-check',
          error: 'el-icon-circle-close'
        }[this.validateState];
      },
      textareaStyle() {
        return merge({}, this.textareaCalcStyle, { resize: this.resize });
      },
      inputSize() {
        return this.size || this._elFormItemSize || (this.$ELEMENT || {}).size;
      },
      inputDisabled() {
        if (this.readable) {
          return this.disabled || this.readable || (this.elForm || {}).disabled || (this.elForm || {}).readable;
        } else {
          return this.disabled || (this.elForm || {}).disabled || (this.elForm || {}).readable;
        }
      },
      nativeInputValue() {
        return this.value === null || this.value === undefined ? '' : String(this.value);
      },
      showClear() {
        return this.clearable &&
          !this.inputDisabled &&
          !this.readonly &&
          this.nativeInputValue &&
          (this.focused || this.hovering);

      },
      showPwdVisible() {
        return this.showPassword &&
          !this.inputDisabled &&
          !this.readonly &&
          (!!this.nativeInputValue || this.focused);
      },
      isWordLimitVisible() {
        return this.showWordLimit &&
          this.$attrs.maxlength &&
          // !this.inputDisabled &&
          (this.type === 'text' || this.type === 'textarea') &&
          // !this.readonly &&
          !this.showPassword;
      },
      upperLimit() {
        return this.$attrs.maxlength;
      },
      textLength() {
        if (typeof this.value === 'number') {
          return String(this.value).length;
        }

        return (this.value || '').length;
      },
      inputExceed() {
        // show exceed style if length of initial value greater then maxlength
        return this.isWordLimitVisible &&
          (this.textLength > this.upperLimit);
      }
    },

    watch: {
      value(val) {
        this.$nextTick(this.resizeTextarea);
        if (this.validateEvent) {
          this.dispatch('ElFormItem', 'el.form.change', [val]);
        }
      },
      // native input value is set explicitly
      // do not use v-model / :value in template
      // see: https://github.com/ElemeFE/element/issues/14521
      nativeInputValue() {
        this.setNativeInputValue();
      },
      // when change between <input> and <textarea>,
      // update DOM dependent value and styles
      // https://github.com/ElemeFE/element/issues/14857
      type() {
        this.$nextTick(() => {
          this.setNativeInputValue();
          this.resizeTextarea();
          this.updateIconOffset();
        });
      },
      focused(val) {
        if (!val) {
          this.blur()
        }
      }
    },

    methods: {
      clickOut() {
        this.focused = false;
      },
      focus() {
        this.getInput().focus();
      },
      blur() {
        this.getInput().blur();
      },
      getMigratingConfig() {
        return {
          props: {
            'icon': 'icon is removed, use suffix-icon / prefix-icon instead.',
            'on-icon-click': 'on-icon-click is removed.'
          },
          events: {
            'click': 'click is removed.'
          }
        };
      },
      handleBlur(event) {
        // this.focused = false;
        if (this.type === 'textarea') {
          this.$nextTick(() => {
            this.$refs.textarea.scrollTop = 0
          })
        }
        this.$emit('blur', event);
        if (this.validateEvent) {
          this.dispatch('ElFormItem', 'el.form.blur', [this.value]);
        }
      },
      select() {
        this.getInput().select();
      },
      resizeTextarea() {
        if (this.$isServer) return;
        const { autosize, type } = this;
        if (type !== 'textarea') return;
        if (!autosize) {
          this.textareaCalcStyle = {
            minHeight: calcTextareaHeight(this.$refs.textarea).minHeight,
            lineHeight: '21px'
          };
          return;
        }
        const minRows = autosize.minRows;
        const maxRows = autosize.maxRows;

        this.textareaCalcStyle = calcTextareaHeight(this.$refs.textarea, minRows, maxRows);
      },
      setNativeInputValue() {
        const input = this.getInput();
        if (!input) return;
        if (input.value === this.nativeInputValue) return;
        input.value = this.nativeInputValue;
      },
      handleFocus(event) {
        this.focused = true;
        this.$emit('focus', event);
      },
      handleCompositionStart() {
        this.isComposing = true;
      },
      handleCompositionUpdate(event) {
        const text = event.target.value;
        const lastCharacter = text[text.length - 1] || '';
        this.isComposing = !isKorean(lastCharacter);
      },
      handleCompositionEnd(event) {
        if (this.isComposing) {
          this.isComposing = false;
          this.handleInput(event);
        }
      },
      handleKeydown(e) {
        if (this.type === 'number' && e.target.value.length > 0 && !/[0-9\bBackspace\b]/.test(e.key)) {
          e.preventDefault()
        }
      },
      handleInput(event) {
        if(this.autosize){
          // this.$refs.textarea.style.height='21'
          // this.$refs.textarea.scrollTop = 0
          // this.$refs.textarea.style.height = this.$refs.textarea.scrollHeight + 5 + 'px'
        }
        // should not emit input during composition
        // see: https://github.com/ElemeFE/element/issues/10516
        if (this.isComposing) return;
        // 只支持中英文和数字
        if(this.$options.propsData.hasOwnProperty('inputLimit') ? this.inputLimit : this.$MODesignConfig.inputLimit && this.type !== 'textarea'){
          event.target.value = event.target.value.replace(/[^a-zA-Z0-9\u4E00-\u9FA5]/g, '')
        }
        // hack for https://github.com/ElemeFE/element/issues/8548
        // should remove the following line when we don't support IE
        if (event.target.value === this.nativeInputValue) return;
        this.$emit('input', event.target.value);
        // ensure native input value is controlled
        // see: https://github.com/ElemeFE/element/issues/12850
        this.$nextTick(this.setNativeInputValue);
      },
      handleChange(event) {
        this.$emit('change', event.target.value);
      },
      calcIconOffset(place) {
        let elList = [].slice.call(this.$el.querySelectorAll(`.el-input__${place}`) || []);
        if (!elList.length) return;
        let el = null;
        for (let i = 0; i < elList.length; i++) {
          if (elList[i].parentNode === this.$el) {
            el = elList[i];
            break;
          }
        }
        if (!el) return;
        const pendantMap = {
          suffix: 'append',
          prefix: 'prepend'
        };

        const pendant = pendantMap[place];
        if (this.$slots[pendant]) {
          el.style.transform = `translateX(${place === 'suffix' ? '-' : ''}${this.$el.querySelector(`.el-input-group__${pendant}`).offsetWidth}px)`;
        } else {
          el.removeAttribute('style');
        }
      },
      updateIconOffset() {
        this.calcIconOffset('prefix');
        this.calcIconOffset('suffix');
      },
      clear() {
        this.iconHover= false;
        this.$emit('input', '');
        this.$emit('change', '');
        this.$emit('clear');
      },
      handlePasswordVisible() {
        this.passwordVisible = !this.passwordVisible;
        this.$nextTick(() => {
          this.focus();
        });
      },
      getInput() {
        return this.$refs.input || this.$refs.textarea;
      },
      getSuffixVisible() {
        return this.$slots.suffix ||
          this.suffixIcon ||
          this.showClear ||
          this.showPassword ||
          this.isWordLimitVisible ||
          (this.validateState && this.needStatusIcon);
      }
    },

    created() {
      this.$on('inputSelect', this.select);
    },

    mounted() {
      this.setNativeInputValue();
      this.resizeTextarea();
      this.updateIconOffset();

      // 处理有后缀的时候对.el-input__suffix进行重新定位
      if(this.$slots.append){
        const suffix = this.$el.querySelector(".el-input__suffix")
        const append = this.$el.querySelector(".el-input-group__append")
        suffix.style.right = append.getBoundingClientRect().width + 10 + "px"
      }
    },

    updated() {
      this.$nextTick(this.updateIconOffset);
    }
  };
</script>

