<template>
  <div class="kole-range" ref="root">
    <div class="kole-range-trigger" :class="{ 'is-focus': open }" @click="open = !open">
      <span v-if="modelValue.start && modelValue.end">{{ modelValue.start }} <span class="kole-range-sep">~</span> {{ modelValue.end }}</span>
      <span v-else class="kole-range-placeholder">请选择时间范围</span>
    </div>
    <div v-show="open" class="kole-range-pop">
      <div class="kole-range-presets">
        <button
          v-for="(p, i) in presets"
          :key="i"
          class="kole-range-preset"
          :class="{ 'is-active': activeIndex === i }"
          @click="applyPreset(i)"
        >{{ p.label }}</button>
      </div>
      <div class="kole-range-custom">
        <input type="date" v-model="start" />
        <span class="kole-range-tilde">~</span>
        <input type="date" v-model="end" />
      </div>
      <div class="kole-range-actions">
        <button class="kole-range-cancel" @click="close">取消</button>
        <button class="kole-range-ok" @click="confirm">确定</button>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted, onBeforeUnmount } from 'vue';

function fmt(d) {
  return d.getFullYear() + '-' + String(d.getMonth() + 1).padStart(2, '0') + '-' + String(d.getDate()).padStart(2, '0');
}
function presetRange(p) {
  let end = new Date(); end.setHours(0, 0, 0, 0);
  let start = new Date(end);
  if (p.year === 'this') start = new Date(end.getFullYear(), 0, 1);
  else if (p.month === 'this') start = new Date(end.getFullYear(), end.getMonth(), 1);
  else if (p.month === 'last') { start = new Date(end.getFullYear(), end.getMonth() - 1, 1); end = new Date(end.getFullYear(), end.getMonth(), 0); }
  else { start.setDate(end.getDate() + (p.days || 0)); if (p.len) start.setDate(end.getDate() - (p.len - 1)); }
  return { start: fmt(start), end: fmt(end) };
}

const props = defineProps({
  modelValue: { type: Object, default: () => ({ start: '', end: '' }) },
  presets: {
    type: Array,
    default: () => [
      { label: '今天', days: 0 },
      { label: '昨天', days: -1, len: 1 },
      { label: '近7天', days: -6 },
      { label: '近30天', days: -29 },
      { label: '本月', month: 'this' },
      { label: '上月', month: 'last' },
      { label: '本年', year: 'this' }
    ]
  }
});
const emit = defineEmits(['update:modelValue']);

const root = ref(null);
const open = ref(false);
const start = ref(props.modelValue.start);
const end = ref(props.modelValue.end);
const activeIndex = ref(-1);

function applyPreset(i) {
  const r = presetRange(props.presets[i]);
  start.value = r.start; end.value = r.end; activeIndex.value = i;
}
function confirm() {
  emit('update:modelValue', { start: start.value, end: end.value });
  close();
}
function close() { open.value = false; activeIndex.value = -1; }

function onDoc(e) { if (root.value && !root.value.contains(e.target)) close(); }
onMounted(() => document.addEventListener('click', onDoc));
onBeforeUnmount(() => document.removeEventListener('click', onDoc));
</script>

<style src="./RangeQuickPicker.css"></style>
