<template>
	<div class="examination-wrap bg-white">
		<div class="examination-content">
			<h4 class="examination-title">考试标题</h4>
			<p class="examination-info">
				<span>题量：9</span>
				<span>总分：100</span>
				<span>合格：60</span>
				<span>答题时间：{{duration}}</span>
			</p>
			<ul class="examination-question-list">
				<li  :id="'anchor-'+num" v-for="(items,num) in testList" :key="num">
					<h5>{{ num +1 }}．{{items.title}}
						<span  v-if="items.type === 0">［判断题］</span>
						<span  v-if="items.type === 1">［单选题］</span>
						<span  v-if="items.type === 2">［多选题］</span>
					</h5>
					<div v-if="items.type == 0">
						<div class="answer-list">
							<p>A. 正确</p>
							<p>B. 错误</p>
						</div>
						<div class="check-content">
							<span :class="{active: isSelected(items, 0)}" @click="selectOption(items,num,0)"><i class="iconfont icon-gouxuan"></i>A</span>
							<span :class="{active: isSelected(items, 1)}" @click="selectOption(items,num,1)"><i class="iconfont icon-gouxuan"></i>B</span>
						</div>
					</div>
					<div v-else>
						<div class="answer-list">
							<p v-for="(item, index) in items.options" :key="index">{{item}}</p>
						</div>
						<div class="check-content">
							<span v-for="(item, index) in items.options" :key="index" :class="{active: isSelected(items, index)}" @click="selectOption(items,num,index)"><i class="iconfont icon-gouxuan"></i>{{numberToLetter(index)}}</span>
						</div>
					</div>
				</li>
			</ul>
		</div>
		<div class="cutdown-submit-wrap bg-white">
			<div class="examination-num">
				<a href="javascript:;" @click="selectIndex(index)" class="num-item" v-for="(item,index) in testList" :class="{selected: isDone(item), current: index === currentIndex}">{{index + 1}}</a>
			</div>
			<div class="cutdown-content">
				<span class="cutdown-text">剩余时间：<span class="red">{{rest}}</span></span>
				<x-button mini class="examination-submit-btn" @click.native="submitAnswer">提交试卷</x-button>
			</div>
		</div>
		<!-- 提示弹窗  start-->
		<div v-transfer-dom>
		    <confirm v-model="confirmShow" :cancel-text="readWrongText" :title="confirmTitle" @on-cancel="onCancel" @on-confirm="onConfirm">
		        <p style="text-align:center;">{{ confirmText }}</p>
		    </confirm>
	    </div>
	    <div v-transfer-dom>
	    	<alert v-model="alertShow" :title="alertTitle" @on-hide="onHide"> {{ alertText }}</alert>
	    </div>
	    <!-- 提示弹窗  end-->
	</div>
</template>

<script>
// 多选题数组选项处理
Array.prototype.contains = function (obj) {
    var i = this.length
    while (i--) {
        if (this[i] === obj) {
            return true
        }
    }
    return false
}
import { XButton, Confirm, Alert, TransferDomDirective as TransferDom } from 'vux'
export default {
	directives: {
	    TransferDom
	},
	components: {
		XButton,
		Confirm,
		Alert
	},
	data () {
		return {
			alertShow: false,
			alertTitle: '提示',
			alertText: '',
			alertType: 0,
			confirmShow: false,
			confirmTitle: '提示',
			confirmText: '',
			confirmType: 0,
			readWrongText: '取消',
			currentIndex: 0,
            time: '1800',
            endTime: null,
			testList: [
				{
					type: 0,
					title: 'title',
					userAnswer: null
				},
				{
					type: 1,
					title: 'title',
					options:[
						'A. 选项',
						'B. 选项',
						'C. 选项',
						'D. 选项'
					],
					userAnswer: null
				},
				{
					type: 2,
					title: 'title',
					options:[
						'A. 选项',
						'B. 选项',
						'C. 选项',
						'D. 选项'
					],
					userAnswer: null
				},
				
			]
		}
	},
	computed: {
        duration () {
            return this.fomart(this.time);
        },
		rest () {
			return this.fomart(this.endTime);
		}
    },
    mounted() {
        this.$nextTick(function () {
            this.updateTime();
        })
    },
    methods: {
        isSelected(item, index) {
            if (item.type === 2) {
                if (!item.userAnswer) {
                    return false
                }
                for (var answer of item.userAnswer) {
                    if (answer === index) {
                        return true
                    }
                }
                return false
            } else {
                return item.userAnswer === index
            }
            return false
        },
        isDone(item) {
			if (item.type === 0) {
				return item.userAnswer === 0 || item.userAnswer === 1
			}
            if (item.type === 1) {
                return item.userAnswer || item.userAnswer === 0
            }
            if (item.type === 2) {
                return item.userAnswer && item.userAnswer.length
            }
            return false
        },
        selectOption(item, num, index) {
            this.currentIndex = num;
            if (item.type === 2) {
                var userAnswer = this.testList[this.currentIndex].userAnswer
                if (!userAnswer) {
                    userAnswer = []
                }
                if (userAnswer.contains(index)) {
                    for (var i = 0; i < userAnswer.length; i++) {
                        if (userAnswer[i] === index) {
                            userAnswer.splice(i, 1)
                            return
                        }
                    }
                }
                userAnswer.push(index)
                
                userAnswer = userAnswer.sort()
                this.testList[this.currentIndex].userAnswer = userAnswer
            } else {
                this.testList[this.currentIndex].userAnswer = index
            }
        },
        selectIndex(index) {
            this.currentIndex = index
        },
        // 锚点选中和定位
        selectIndex(index) {
            this.currentIndex = index;
            var anchor = this.$el.querySelector('#anchor-'+index);
            document.querySelector('.content-scroll').scrollTop = anchor.offsetTop; // 这里的 document.querySelector('.content-scroll') 是一个div容器，如果想让window滚动定位，换成window就好了
        },
        submitAnswer() {
            var that = this,answerArr = [],answerLen;
            this.testList.forEach(function (item, index) {
                if (item.userAnswer || item.userAnswer === 0) {
                    if (item.type === 1 || item.type === 0) {
                        answerArr.push(that.numberToLetter(item.userAnswer))
                    } else if (item.type === 2) {
                        var arr = [];
                        item.userAnswer.forEach(function (answer, index) {
                            arr.push(that.numberToLetter(answer))
                        })
                        answerArr.push(arr)
                    }
                }
            })
            answerLen = this.testList.length - answerArr.length;
            if (answerLen == 0) {
				this.confirmShow = !this.confirmShow;
				this.confirmText = '您确认提交吗!';
//				console.log(this.fomart(this.time - this.endTime))
//              console.log(answerArr)
            } else {
                this.alertShow = !this.alertShow;
                this.alertText = '您还有' + answerLen + '题未做!';
            }
        },
        updateTime() {
            var that = this,time = this.time;
            this.timer = setInterval(function () {
                time = time - 1;
                that.endTime = time;
				if (time === 0){
					clearInterval(that.timer);
					that.alertShow = !this.alertShow;
					that.alertType = 1;
                	that.alertText = '考试时间结束！';
				}
            }, 1000)
        },
        fomart(time) {
			var h,m,s;
            h = Math.floor(time / 3600); 
            m = Math.floor(time / 60 % 60);
            s = Math.floor(time % 60); 
            h < 10 ? h = '0' + h : h = h; 
            m < 10 ? m = '0' + m : m = m;
            s < 10 ? s = '0' + s : s = s;
            return h + ':' + m + ':' + s;
        },
        numberToLetter(number) {
            var arr = 'ABCD'
            return arr[number]
        },
	    onConfirm() {
	    	var that = this;
	    	if ( this.confirmType === 1 ){
	    		this.$router.push({path: '/'})
	    	} else {
	    		clearInterval(this.timer);
	    		setTimeout(function() {
	    			that.viewScore();
	    		},500)
	    	}
			     	
	    },
	    viewScore() {
	    	this.confirmShow = !this.confirmShow;
    		this.confirmType = 1;
			this.confirmTitle = '成绩';
			this.confirmText = '您的得分：70';
			this.readWrongText = '查看错题';
	    },
	    onCancel() {
	    	if ( this.confirmType === 1 ){
	    		alert('进入错题中...')
	    	} 
	    },
	    onHide() {
	    	if (this.alertType === 1){
	    		this.$router.push({path: '/'})
	    	}
	    }

    }
}
</script>

<style lang="less">
.examination-content{
	padding-bottom: 60px;
	h4{
		font-size: .8rem;
		font-weight: 400;
		text-align: center;
		padding: 5px 0;
	}
	.examination-info{
		font-size: .6rem;
		border-top: 1px solid #eee;
		border-bottom: 1px solid #eee;
		padding: 5px 10px;
		span{
			margin-right: 4%;
		}
	}
	.examination-question-list{
		padding:  0 10px 20px;	
		font-size: .7rem;
		h5{
			font-size: .75rem;
			font-weight: 400;
			line-height: 20px;
			margin-top: 15px;
		}
		.answer-list{
			padding: 8px 0 0 6px;
			line-height: normal;
			p{
				margin-bottom: 8px;
			}
		}
		.check-content {
			padding: 5px 0 8px;
			border-bottom: 1px solid #eee;
			span{
				padding: 5px 10px;
				&.active .iconfont:before{
				    content: '\e60f';
					color: #09BB07;
				}
			}
			.iconfont{
				font-size: 1rem;
				margin-right: 2px;
				vertical-align: middle;
				&:before{
				    color: #c9c9c9;
				}
			}
		}
	}
}
.cutdown-submit-wrap{
	position: fixed;
	bottom: 50px;
	left: 0;
	right: 0;
	padding: 5px 10px;
	border-top: 1px solid #eee;
	.examination-num{
		overflow: hidden;
		.num-item{
			float: left;
			display: inline-block;
			font-size: .6rem;
			padding: 1px 8px;
		    margin-right: 4px;
		    margin-bottom: 6px;
			border: 1px solid #ccc;
			&.selected{
				color: #fff;
				border-color: #09BB07;
				background-color: #09BB07;
			}
			
		}
	} 
	.cutdown-content{
		margin-top: 5px;
		.cutdown-text{
			font-size: .6rem;
			.red{
				font-size: .8rem;
			}
		}
		.examination-submit-btn{
			float: right;
			color: #fff;
			background-color: #f00;
			&:after{
				border: none;
			}
		}
	}
}
</style>