<template>
  <div>
    <label v-if="label" class="cursor-pointer text-gray-light text-lg mb-2"
           @click="browse"
    >{{ label }}:</label>
    <div :class="{ error: error }">
      <input ref="file" type="file"
             :accept="accept" class="hidden"
             @change="change"
      >
      <div v-if="!modelValue" class="py-2">
        <button type="button" class="px-6 py-2 bg-indigo-300 focus:ring-4 focus:ring-offset-1 focus:ring-orange focus:ring-opacity-20 focus:ring-offset-orange focus:outline-none focus:border-transparent rounded-sm text-sm text-white"
                @click="browse"
        >
          Выбрать файл
        </button>
      </div>
      <div v-else class="flex flex-col justify-center max-w-2xl mt-3 p-2 border rounded-md">
        <div class="flex flex-col md:flex-row md:items-start md:justify-between p-1">
          <div class="md:w-5/6 flex-1 flex flex-col pr-1 text-gray">
            <span class="truncate">{{ modelValue.name }}</span>
            <span class="text-xs text-gray-light">({{ filesize(modelValue.size) }})</span>
          </div>
          <button type="button" class="md:w-1/6 px-1 py-1 bg-indigo-300 hover:bg-indigo-100 rounded-sm text-xs font-medium text-white"
                  @click="remove"
          >
            Удалить
          </button>
        </div>
      </div>
    </div>
    <div v-if="error" class="text-red text-sm">
      {{ error }}
    </div>
  </div>
</template>

<script>
export default {
    props: {
        modelValue: File,
        label: String,
        accept: String,
        error: String,
    },
    watch: {
        modelValue(value) {
            if (!value) {
                this.$refs.file.value = ''
            }
        },
    },
    methods: {
        filesize(size) {
            var i = Math.floor(Math.log(size) / Math.log(1024))
            return (size / Math.pow(1024, i) ).toFixed(2) * 1 + ' ' + ['B', 'kB', 'MB', 'GB', 'TB'][i]
        },
        browse() {
            this.$refs.file.click()
        },
        change(e) {
            this.$emit('update:modelValue', e.target.files[0])
        },
        remove() {
            this.$emit('update:modelValue', null)
        },
    },
}
</script>
