<script lang="ts" setup>
import type { InputOnBlurEvent, InputOnConfirmEvent, InputOnFocusEvent, InputOnInputEvent } from '@uni-helper/uni-app-types'
import { computed, defineComponent, nextTick, onMounted, ref, toRef, useSlots, watch } from 'vue'
import { BLUR_EVENT, CLEAR_EVENT, CLICK_EVENT, CONFIRM_EVENT, FOCUS_EVENT, INPUT_EVENT, PREFIX, UPDATE_MODEL_EVENT } from '../_constants'
import { getMainClass, isH5 } from '../_utils'
import { useFormDisabled } from '../form/form'
import NutIcon from '../icon/icon.vue'
import { inputEmits, inputProps } from './input'
import type { InputFormatTrigger, InputTarget } from './type'
import { formatNumber } from './util'

const props = defineProps(inputProps)

const emit = defineEmits(inputEmits)

const slots = useSlots()

function hasSlot(name: string) {
  return Boolean(slots[name])
}

const formDisabled = useFormDisabled(toRef(props, 'disabled'))

function stringModelValue() {
  if (props.modelValue == null)
    return ''

  return String(props.modelValue)
}

const innerValue = computed<string>(() => {
  return stringModelValue()
})

const classes = computed(() => {
  return getMainClass(props, componentName, {
    [`${componentName}--disabled`]: formDisabled.value,
    [`${componentName}--required`]: props.required,
    [`${componentName}--error`]: props.error,
    [`${componentName}--border`]: props.border,
  })
})

const inputStyles = computed(() => {
  return [props.inputStyle, {
    textAlign: props.inputAlign,
  }]
})

const innerMaxLength = computed(() => {
  if (props.maxLength == null)
    return -1

  return Number(props.maxLength)
})

function updateValue(value: string, trigger: InputFormatTrigger = 'onChange') {
  if (innerMaxLength.value > 0 && value.length > innerMaxLength.value)
    value = value.slice(0, innerMaxLength.value)

  if (props.type === 'number')
    value = formatNumber(value, false, false)

  if (props.type === 'digit')
    value = formatNumber(value, true, true)

  if (props.formatter && trigger === props.formatTrigger)
    value = props.formatter(value)

  emit(UPDATE_MODEL_EVENT, value)
}

function _onInput(evt: InputOnInputEvent) {
  updateValue(evt.detail.value)

  nextTick(() => {
    emit(INPUT_EVENT, innerValue.value, evt)
  })
}

function handleInput(evt: InputOnInputEvent) {
  if (isH5) {
    const target = evt.target as InputTarget

    if (!target.composing)
      _onInput(evt)
  }
  else {
    _onInput(evt)
  }
}

function handleClick(evt: any) {
  emit(CLICK_EVENT, evt)
}

function handleClickInput(evt: any) {
  if (formDisabled.value)
    return

  emit('clickInput', evt)
}

const active = ref(false)

const clearing = ref(false)

function handleFocus(evt: InputOnFocusEvent) {
  if (formDisabled.value || props.readonly)
    return

  emit(FOCUS_EVENT, evt)

  active.value = true
}

function handleBlur(evt: InputOnBlurEvent) {
  if (formDisabled.value || props.readonly)
    return

  emit(BLUR_EVENT, evt)

  setTimeout(() => {
    active.value = false
  }, 200)

  if (clearing.value) {
    clearing.value = false
    return
  }

  updateValue(evt.detail.value, 'onBlur')
}

function handleConfirm(evt: InputOnConfirmEvent) {
  emit(CONFIRM_EVENT, evt)
}

function handleClear(evt: any) {
  if (formDisabled.value)
    return

  emit(UPDATE_MODEL_EVENT, '', evt)
  emit(CLEAR_EVENT)

  clearing.value = true
}

function startComposing(evt: any) {
  if (isH5) {
    const target = evt.target as InputTarget

    target.composing = true
  }
}

function endComposing(evt: any) {
  if (isH5) {
    const target = evt.target as InputTarget

    if (target.composing) {
      target.composing = false
      target.dispatchEvent(new Event('input'))
    }
  }
}

watch(
  () => props.modelValue,
  (value) => {
    if (value === innerValue.value)
      return

    updateValue(stringModelValue())
  },
)

onMounted(() => {
  updateValue(stringModelValue(), props.formatTrigger)
})
</script>

<script lang="ts">
const componentName = `${PREFIX}-input`

export default defineComponent({
  name: componentName,
  options: {
    virtualHost: true,
    addGlobalClass: true,
    styleIsolation: 'shared',
  },
})
</script>

<template>
  <view :class="classes" :style="props.customStyle" @click="handleClick">
    <view v-if="hasSlot('left')" class="nut-input__left">
      <slot name="left" />
    </view>

    <view class="nut-input__value">
      <input
        class="nut-input__input"
        :class="props.inputClass"
        :style="inputStyles"
        :value="innerValue"
        :type="props.type as any"
        :placeholder="props.placeholder"
        :placeholder-style="props.placeholderStyle"
        :placeholder-class="props.placeholderClass"
        :disabled="formDisabled"
        :readonly="props.readonly"
        :focus="props.autofocus"
        :maxlength="innerMaxLength"
        :format-trigger="props.formatTrigger"
        :auto-blur="props.autofocus ? true : undefined"
        :confirm-type="props.confirmType"
        :adjust-position="props.adjustPosition"
        :always-system="props.alwaysSystem"
        :inputmode="props.inputMode"
        :cursor-spacing="props.cursorSpacing"
        :always-embed="props.alwaysEmbed"
        :confirm-hold="props.confirmHold"
        :cursor="props.cursor"
        :selection-start="props.selectionStart"
        :selection-end="props.selectionEnd"
        :hold-keyboard="props.holdKeyboard"
        :password="props.password"
        @input="handleInput"
        @focus="handleFocus"
        @blur="handleBlur"
        @click="handleClickInput"
        @change="endComposing"
        @compositionstart="startComposing"
        @compositionend="endComposing"
        @confirm="handleConfirm"
      >

      <view v-if="props.readonly" class="nut-input__mask" @click="handleClickInput" />

      <view v-if="props.showWordLimit && innerMaxLength > 0" class="nut-input__word-limit">
        <text class="nut-input__word-num">
          {{ innerValue.length }}
        </text>/{{ innerMaxLength }}
      </view>
    </view>

    <view
      v-if="props.clearable && !props.readonly"
      class="nut-input__clear"
      :class="{ 'nut-hidden': !((active || props.showClearIcon) && innerValue.length > 0) }"
      @click.stop="handleClear"
    >
      <slot v-if="hasSlot('clear')" name="clear" />
      <NutIcon
        v-else
        name="mask-close"
        custom-class="nut-input__clear-icon"
        :size="props.clearSize"
        :width="props.clearSize"
        :height="props.clearSize"
      />
    </view>

    <view v-if="hasSlot('right')" class="nut-input__right">
      <slot name="right" />
    </view>
  </view>
</template>

<style lang="scss">
@import './index';
</style>
