<template>
	<view class="g-picker">
		<view class="g-picker-value" @click="showPicker">
			<u-input class="" v-model="val" disabled disabledColor="#fff" :inputAlign="inputAlign" border="none"
				 style="pointer-events:none" placeholder="请选择准驾车型">
			</u-input>
		</view>
		<u-popup :show="show" :round="6" mode="bottom">
			<view class="g-picker-con">
				<view class="g-picker-operate">
					<text @click="show = false">取消</text>
					<text @click="confirm">确认</text>
				</view>
				<view class="g-picker-list">
					<view class="g-picker-item" v-for="(col, inx) in columnsList" :key="inx"
						@click="checkItem(col, inx)">
						<view :class="['g-picker-item_label', col._check ? 'g-picker-item--actived' : '']"
							:style="{color: col._check ? activedColor : '#333'}">{{ col[filter.label] }}</view>
						<u-icon class="g-picker-item_icon" v-show="col._check" name="checkbox-mark"
							:color="activedColor"></u-icon>
					</view>
				</view>
			</view>
		</u-popup>
	</view>
</template>

<script>
	export default {
		// model: {
		// 	prop: 'value',
		// 	event: 'change'
		// },
		props: {
			// picker组件绑定值，默认 name 用，拼接
			value: {
				type: String,
				default: ""
			},
			// 数据源
			columns: {
				type: Array,
				default: () => {
					return []
				}
			},
			// 数据显示格式化
			filter: {
				type: Object,
				default: () => {
					return {
						label: 'label',
						value: 'value'
					}
				}
			},
			// 是否禁用
			disabled: {
				type: Boolean,
				default: false
			},
			// 选中后颜色
			activedColor: {
				type: String,
				default: "#F58621"
			},
			// 文本对齐方式
			inputAlign: {
				type: String,
				default: "right"
			},
			// 默认提示
			placeholder: {
				type: String,
				default: "请选择"
			},
		},
		data() {
			return {
				show: false,
				val: "",
				columnsList: [],
				value_chx: []
			}
		},
		watch: {
			value: {
				handler(n) {
					if (n) this.reShow();
				},
				immediate: true
			},
			columns: {
				handler(n) {
					if (n.length) {
						this.columnsList = n
						for (let val of this.columnsList) {
							this.$set(val, '_check', false)
						}
					}
				},
				immediate: true
			}
		},
		methods: {
			showPicker() {
				if (this.disabled) return
				this.show = true
			},
			reShow() {
				let data = this.value.split(",")
				setTimeout(() => {
					let ary = []
					for (let val of this.columnsList) {
						if (data.includes(val[this.filter.value])) {
							val._check = true
							ary.push(val[this.filter.label])
						}
					}
					this.val = ary.join(",")
				}, 100)
			},
			checkItem(col, inx) {
				col._check = !col._check
			},
			confirm() {
				let value = [],
					label = []
				this.value_chx = this.columns.filter(v => v._check)
				for (let val of this.value_chx) {
					value.push(val[this.filter.value])
					label.push(val[this.filter.label])
				}
				this.show = false
				this.val = label.join(",")
				this.$emit('input', value.join(","))
				this.$emit('confirm', this.value_chx, value, label)
			}
		}
	}
</script>
<style lang="scss" scoped>
	.g-picker {
		font-size: 16px;
		.g-picker-value {
			display: flex;
		}

		.g-picker-con {
			color: #333;
			font-size: 28rpx;

			.g-picker-operate {
				display: flex;
				align-items: center;
				justify-content: space-between;
				height: 80rpx;
				padding: 0 32rpx;

				text {
					color: #999;

					&:last-child {
						color: #3c9cff;
					}
				}
			}

			.g-picker-list {
				min-height: 30vh;
				max-height: 10vh;
				overflow-y: scroll;

				.g-picker-item {
					position: relative;
					width: 100%;
					height: 80rpx;

					.g-picker-item_label {
						width: 66%;
						margin: 0 auto;
						text-align: center;
						line-height: 80rpx;
						white-space: nowrap;
						text-overflow: ellipsis;
						overflow: hidden;
					}

					.g-picker-item--actived {
						font-weight: 600;
					}

					.g-picker-item_icon {
						position: absolute;
						top: 50%;
						right: 40rpx;
						transform: translateY(-50%);
					}
				}
			}
		}
	}
</style>
