<template>
	<view>
		<u-popup
			:blur="blur"
			:zoom="zoom"
			mode="center"
			:popup="false"
			:z-index="uZIndex"
			v-model="popupValue"
			:length="width"
			:mask-close-able="maskCloseAble"
			:border-radius="borderRadius"
			@close="popupClose"
			:negative-top="negativeTop"
		>
			<view class="u-model">
				<view v-if="showTitle" class="u-model__title u-line-1" :style="[titleStyle]">
					{{ title }}
				</view>
				<view class="u-model__content">
					<view :style="[contentStyle]" v-if="$slots.default || $slots.$default"><slot /></view>
					<view v-else class="u-model__content__message" :style="[contentStyle]">
						{{ content }}
					</view>
				</view>
				<view class="u-model__footer u-border-top" v-if="showCancelButton || showConfirmButton">
					<view
						v-if="showCancelButton"
						:hover-stay-time="100"
						hover-class="u-model__btn--hover"
						class="u-model__footer__button"
						:style="[cancelBtnStyle]"
						@tap="cancel"
					>
						{{ cancelText }}
					</view>
					<view
						v-if="showConfirmButton || $slots['confirm-button']"
						:hover-stay-time="100"
						:hover-class="asyncClose ? 'none' : 'u-model__btn--hover'"
						class="u-model__footer__button hairline-left"
						:style="[confirmBtnStyle]"
						@tap="confirm"
					>
						<slot v-if="$slots['confirm-button']" name="confirm-button"></slot>
						<block v-else>
							<u-loading mode="circle" :color="confirmColor" v-if="loading"></u-loading>
							<block v-else>{{ confirmText }}</block>
						</block>
					</view>
				</view>
			</view>
		</u-popup>
	</view>
</template>

<script>
/**
 * modal 模态框
 * @description 弹出模态框,常用于消息提示、消息确认、在当前页面内完成特定的交互操作
 * @tutorial https://www.uviewui.com/components/modal.html
 * @property {Boolean} value 是否显示模态框
 * @property {String | Number} z-index 层级
 * @property {String} title 模态框标题(默认"提示")
 * @property {String | Number} width 模态框宽度(默认600)
 * @property {String} content 模态框内容(默认"内容")
 * @property {Boolean} show-title 是否显示标题(默认true)
 * @property {Boolean} async-close 是否异步关闭,只对确定按钮有效(默认false)
 * @property {Boolean} show-confirm-button 是否显示确认按钮(默认true)
 * @property {Stringr | Number} negative-top modal往上偏移的值
 * @property {Boolean} show-cancel-button 是否显示取消按钮(默认false)
 * @property {Boolean} mask-close-able 是否允许点击遮罩关闭modal(默认false)
 * @property {String} confirm-text 确认按钮的文字内容(默认"确认")
 * @property {String} cancel-text 取消按钮的文字内容(默认"取消")
 * @property {String} cancel-color 取消按钮的颜色(默认"#606266")
 * @property {String} confirm-color 确认按钮的文字内容(默认"#2979ff")
 * @property {String | Number} border-radius 模态框圆角值,单位rpx(默认16)
 * @property {Object} title-style 自定义标题样式,对象形式
 * @property {Object} content-style 自定义内容样式,对象形式
 * @property {Object} cancel-style 自定义取消按钮样式,对象形式
 * @property {Object} confirm-style 自定义确认按钮样式,对象形式
 * @property {Boolean} zoom 是否开启缩放模式(默认true)
 * @event {Function} confirm 确认按钮被点击
 * @event {Function} cancel 取消按钮被点击
 * @example <u-modal :src="title" :content="content"></u-modal>
 */
export default {
	name: "u-modal",
	emits: ["update:modelValue", "input", "confirm", "cancel"],
	props: {
		// 是否显示Modal
		value: {
			type: Boolean,
			default: false
		},
		modelValue: {
			type: Boolean,
			default: false
		},
		// 层级z-index
		zIndex: {
			type: [Number, String],
			default: ""
		},
		// 标题
		title: {
			type: [String],
			default: "提示"
		},
		// 弹窗宽度,可以是数值(rpx),百分比,auto等
		width: {
			type: [Number, String],
			default: 600
		},
		// 弹窗内容
		content: {
			type: String,
			default: "内容"
		},
		// 是否显示标题
		showTitle: {
			type: Boolean,
			default: true
		},
		// 是否显示确认按钮
		showConfirmButton: {
			type: Boolean,
			default: true
		},
		// 是否显示取消按钮
		showCancelButton: {
			type: Boolean,
			default: false
		},
		// 确认文案
		confirmText: {
			type: String,
			default: "确认"
		},
		// 取消文案
		cancelText: {
			type: String,
			default: "取消"
		},
		// 确认按钮颜色
		confirmColor: {
			type: String,
			default: "#2979ff"
		},
		// 取消文字颜色
		cancelColor: {
			type: String,
			default: "#606266"
		},
		// 圆角值
		borderRadius: {
			type: [Number, String],
			default: 16
		},
		// 标题的样式
		titleStyle: {
			type: Object,
			default() {
				return {};
			}
		},
		// 内容的样式
		contentStyle: {
			type: Object,
			default() {
				return {};
			}
		},
		// 取消按钮的样式
		cancelStyle: {
			type: Object,
			default() {
				return {};
			}
		},
		// 确定按钮的样式
		confirmStyle: {
			type: Object,
			default() {
				return {};
			}
		},
		// 是否开启缩放效果
		zoom: {
			type: Boolean,
			default: true
		},
		// 是否异步关闭,只对确定按钮有效
		asyncClose: {
			type: Boolean,
			default: false
		},
		// 是否允许点击遮罩关闭modal
		maskCloseAble: {
			type: Boolean,
			default: false
		},
		// 给一个负的margin-top,往上偏移,避免和键盘重合的情况
		negativeTop: {
			type: [String, Number],
			default: 0
		},
		// 遮罩的模糊度
		blur: {
			type: [Number, String],
			default: 0
		}
	},
	data() {
		return {
			loading: false, // 确认按钮是否正在加载中
			popupValue: false
		};
	},
	computed: {
		valueCom() {
			// #ifdef VUE2
			return this.value;
			// #endif

			// #ifdef VUE3
			return this.modelValue;
			// #endif
		},
		cancelBtnStyle() {
			return Object.assign(
				{
					color: this.cancelColor
				},
				this.cancelStyle
			);
		},
		confirmBtnStyle() {
			return Object.assign(
				{
					color: this.confirmColor
				},
				this.confirmStyle
			);
		},
		uZIndex() {
			return this.zIndex ? this.zIndex : this.$u.zIndex.popup;
		}
	},
	watch: {
		// 如果是异步关闭时,外部修改v-model的值为false时,重置内部的loading状态
		// 避免下次打开的时候,状态混乱
		valueCom:{
			immediate: true,
			handler(n){
				if (n === true) this.loading = false;
				this.popupValue = n;
			}
		}
	},
	methods: {
		confirm() {
			// 异步关闭
			if (this.asyncClose) {
				this.loading = true;
			} else {
				this.$emit("input", false);
				this.$emit("update:modelValue", false);
			}
			this.$emit("confirm");
		},
		cancel() {
			this.$emit("cancel");
			this.$emit("input", false);
			this.$emit("update:modelValue", false);
			// 目前popup弹窗关闭有一个延时操作,此处做一个延时
			// 避免确认按钮文字变成了"确定"字样,modal还没消失,造成视觉不好的效果
			setTimeout(() => {
				this.loading = false;
			}, 300);
		},
		// 点击遮罩关闭modal,设置v-model的值为false,否则无法第二次弹起modal
		popupClose() {
			this.$emit("input", false);
			this.$emit("update:modelValue", false);
		},
		// 清除加载中的状态
		clearLoading() {
			this.loading = false;
		}
	}
};
</script>

<style lang="scss" scoped>
@import "../../libs/css/style.components.scss";

.u-model {
	height: auto;
	overflow: hidden;
	font-size: 32rpx;
	background-color: #fff;

	&__btn--hover {
		background-color: rgb(230, 230, 230);
	}

	&__title {
		padding-top: 48rpx;
		font-weight: 500;
		text-align: center;
		color: $u-main-color;
	}

	&__content {
		&__message {
			padding: 48rpx;
			font-size: 30rpx;
			text-align: center;
			color: $u-content-color;
		}
	}

	&__footer {
		@include vue-flex;

		&__button {
			flex: 1;
			height: 100rpx;
			line-height: 100rpx;
			font-size: 32rpx;
			box-sizing: border-box;
			cursor: pointer;
			text-align: center;
			border-radius: 4rpx;
		}
	}
}
</style>