<template>
	<view class="tui-numberbox">
		<view class="tui-numbox-icon tui-icon-reduce " :class="[disabled || min >= inputValue ? 'tui-disabled' : '']"
			@tap="reduce" :style="{ color: iconColor, fontSize: iconSize + 'rpx' }"></view>
		<input type="number" v-model="inputValue" :disabled="disabled" @blur="blur" class="tui-num-input"
			:style="{ color: color, fontSize: size + 'rpx', backgroundColor: backgroundColor, height: height + 'rpx', minHeight: height + 'rpx', width: width + 'rpx' }" />
		<view class="tui-numbox-icon tui-icon-plus" :class="[disabled || inputValue >= max ? 'tui-disabled' : '']"
			@tap="plus" :style="{ color: iconColor, fontSize: iconSize + 'rpx' }"></view>
	</view>
</template>

<script>
	export default {
		name: 'tuiNumberbox',
		emits: ['change'],
		props: {
			value: {
				type: [Number, String],
				default: 1
			},
			//最小值
			min: {
				type: Number,
				default: 1
			},
			//最大值
			max: {
				type: Number,
				default: 99
			},
			//迈步大小 1 1.1 10...
			step: {
				type: Number,
				default: 1
			},
			//是否禁用操作
			disabled: {
				type: Boolean,
				default: false
			},
			//加减图标大小 rpx
			iconSize: {
				type: Number,
				default: 26
			},
			iconColor: {
				type: String,
				default: '#666666'
			},
			//input 高度
			height: {
				type: Number,
				default: 42
			},
			//input 宽度
			width: {
				type: Number,
				default: 80
			},
			size: {
				type: Number,
				default: 28
			},
			//input 背景颜色
			backgroundColor: {
				type: String,
				default: '#F5F5F5'
			},
			//input 字体颜色
			color: {
				type: String,
				default: '#333'
			},
			//索引值，列表中使用
			index: {
				type: [Number, String],
				default: 0
			},
			//自定义参数
			custom: {
				type: [Number, String],
				default: 0
			}
		},
		created() {
			this.inputValue = +this.value;
		},
		data() {
			return {
				inputValue: 0
			};
		},
		watch: {
			value(val) {
				this.inputValue = +val;
			}
		},
		methods: {
			getLen(val, step) {
				let len = 0;
				let lenVal = 0;
				//浮点型
				if (!Number.isInteger(step)) {
					len = (step + '').split('.')[1].length
				}
				//浮点型
				if (!Number.isInteger(val)) {
					lenVal = (val + '').split('.')[1].length
				}
				return Math.max(len, lenVal);
			},
			getScale(val, step) {
				let scale = 1;
				let scaleVal = 1;
				//浮点型
				if (!Number.isInteger(step)) {
					scale = Math.pow(10, (step + '').split('.')[1].length);
				}
				//浮点型
				if (!Number.isInteger(val)) {
					scaleVal = Math.pow(10, (val + '').split('.')[1].length);
				}
				return Math.max(scale, scaleVal);
			},
			calcNum: function(type) {
				if (this.disabled || (this.inputValue == this.min && type === 'reduce') || (this.inputValue == this
						.max && type === 'plus')) {
					return;
				}
				const scale = this.getScale(Number(this.inputValue), Number(this.step));
				let len = this.getLen(Number(this.inputValue), Number(this.step));
				let num = Number(this.inputValue) * scale;
				let step = this.step * scale;
				if (type === 'reduce') {
					num -= step;
				} else if (type === 'plus') {
					num += step;
				}
				let value = this.toFixed(num / scale, len);
				if (value < this.min) {
					value = this.min;
				} else if (value > this.max) {
					value = this.max;
				}
				this.handleChange(value, type);
			},
			plus: function() {
				this.calcNum('plus');
			},
			reduce: function() {
				this.calcNum('reduce');
			},
			blur: function(e) {
				let value = e.detail.value;
				if (value) {
					if (~value.indexOf('.') && Number.isInteger(this.step) && Number.isInteger(Number(value))) {
						value = value.split('.')[0];
					}
					value = Number(value);
					if (value > this.max) {
						value = this.max;
					} else if (value < this.min) {
						value = this.min;
					}
				} else {
					value = this.min;
				}
				if ((value == this.value && value != this.inputValue) || !e.detail.value) {
					this.inputValue = value;
				}
				this.handleChange(value, 'blur');
			},
			handleChange(value, type) {
				if (this.disabled) return;
				this.$emit('change', {
					value: Number(value),
					type: type,
					index: this.index,
					custom: this.custom
				});
			},
			toFixed(num, s) {
				let times = Math.pow(10, s)
				let des = num * times + 0.5
				des = parseInt(des, 10) / times
				return Number(des + '')
			}
		}
	};
</script>

<style scoped>
	@font-face {
		font-family: 'numberbox';
		src: url(data:application/font-woff;charset=utf-8;base64,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) format('woff');
		font-weight: normal;
		font-style: normal;
	}

	.tui-numbox-icon {
		font-family: 'numberbox' !important;
		font-style: normal;
		-webkit-font-smoothing: antialiased;
		-moz-osx-font-smoothing: grayscale;
		padding: 10rpx;
	}

	.tui-icon-reduce:before {
		content: '\e691';
	}

	.tui-icon-plus:before {
		content: '\e605';
	}

	.tui-numberbox {
		display: -webkit-inline-flex;
		display: inline-flex;
		align-items: center;
	}

	.tui-num-input {
		text-align: center;
		margin: 0 12rpx;
		font-weight: 400;
	}

	.tui-disabled {
		color: #ededed !important;
	}
</style>
