<template>
	<view class="page" :style="{ 'min-height': h + 'px', 'padding-top': mt + 'px' }">
		<cus-header title="问卷填写" :backAlert="true"></cus-header>
		<div class="top adffcacjc">
			<p>{{ title }}</p>
			<p class="tip">
				共
				<span>{{ list.length }}</span>
				题，已作答
				<span style="font-weight: bold">{{ answerNum }}</span>
				题，请耐心选择！
			</p>
		</div>
		<scroll-view class="list" scroll-y="true" :scroll-top="scrollTop" :style="{ height: h - 180 - mt + 'px' }">
			<div v-if="isLoading" class="loading-container adfacjc">
				<div class="adfac">
					<u-loading-icon size="42"></u-loading-icon>
					<text style="margin-left: 10rpx; font-size: 34rpx; color: #666666">问卷加载中...</text>
				</div>
			</div>
			<template v-else>
				<view>
					<div class="l_item" v-for="(item, index) in list" :key="item.id" :id="'question-' + index">
						<QuestionItem :item="item" :index="index" @change="handleAnswerChange"></QuestionItem>
					</div>
				</view>
			</template>
		</scroll-view>
		<div class="bottom">
			<view class="zt_btn" @tap="submitWj">{{ isSubmitting ? '提交中...' : '提交问卷' }}</view>
		</div>
	</view>
</template>

<script>
import QuestionItem from '@/components/QuestionItem/index.vue';
export default {
	components: { QuestionItem },
	data() {
		return {
			title: '',
			teamQuestionnaireId: '',
			list: [],
			questionnaire: null,
			isLoading: true,
			isSubmitting: false,
			h: 0, // 屏幕可用高度
			mt: 0, // 页面顶部内边距 (用于适配自定义导航栏)
			scrollTop: 0, // scroll-view 的滚动位置
			oldScrollTop: 0 // 辅助值，确保即使滚动到相同位置也能触发
		};
	},
	onLoad(option) {
		const sysInfo = uni.getSystemInfoSync();
		const menuButtonInfo = uni.getMenuButtonBoundingClientRect();
		this.h = sysInfo.windowHeight;
		// 适配自定义导航栏的顶部安全距离 = 状态栏高度 + 胶囊高度 + 上下边距
		this.mt = menuButtonInfo.top + menuButtonInfo.height + (menuButtonInfo.top - sysInfo.statusBarHeight);

		this.title = option.title;
		this.teamQuestionnaireId = option.teamQuestionnaireId;
		this.getList();
	},
	computed: {
		answerNum() {
			return this.list.filter((l) => !!l.answer).length || 0;
		}
	},
	methods: {
		handleAnswerChange(e) {
			const item = this.list[e.index];
			if (item) {
				this.$set(item, 'answer', e.value);
				if (item.warn) {
					this.$set(item, 'warn', false);
				}
			}
			this.setQuestionnaireCache();
		},
		getList() {
			let questionnaire = null;
			try {
				const cacheStr = uni.getStorageSync('questionnaire');
				if (cacheStr) {
					questionnaire = JSON.parse(cacheStr);
				}
			} catch (e) {
				console.error('解析问卷缓存失败:', e);
				uni.removeStorageSync('questionnaire');
			}

			this.isLoading = true;
			this.$api
				.get('/core/team/member/answer/listByUser/' + this.teamQuestionnaireId)
				.then((res) => {
					if (res.data.code !== 0) return this.$showToast(res.data.msg);
					const answerMap = new Map();
					if (questionnaire && this.teamQuestionnaireId == questionnaire.key) {
						questionnaire.list.forEach((q) => answerMap.set(q.id, q.answer));
					}

					this.list = res.data.data.map((item) => ({
						...item,
						warn: false,
						answer: answerMap.get(item.id) || ''
					}));
				})
				.catch(() => {
					this.isLoading = false;
					this.$showToast('网络异常，请稍后重试');
				})
				.finally(() => {
					this.isLoading = false;
				});
		},
		scrollToQuestion(index) {
			const query = uni.createSelectorQuery().in(this);
			const targetId = `#question-${index}`;
			query.select(targetId).boundingClientRect();
			query.select('.list').scrollOffset(); // 获取 scroll-view 的滚动信息
			query.select('.list').boundingClientRect(); // 获取 scroll-view 自身的位置信息
			query.exec((res) => {
				// 增加安全校验
				if (!res || !res[0] || !res[1] || !res[2]) {
					return;
				}

				// res[0]: 目标元素 (#question-N) 的位置信息
				const itemRect = res[0];
				// res[1]: 滚动容器 (.list) 的滚动信息
				const scrollViewScroll = res[1];
				// res[2]: 滚动容器 (.list) 自身的位置信息
				const scrollViewRect = res[2];

				// 计算目标滚动位置 = 当前滚动距离 + (目标元素顶部 - 滚动容器顶部) - 预留间距
				const targetPosition = scrollViewScroll.scrollTop + itemRect.top - scrollViewRect.top - 10; // 减10px作为顶部留白

				// 通过先设置为旧值，再在 nextTick 中设置为新值的方式，确保滚动能够触发
				this.scrollTop = this.oldScrollTop;
				this.$nextTick(() => {
					this.scrollTop = targetPosition;
					this.oldScrollTop = targetPosition;
				});
			});
		},
		submitWj() {
			if (this.isSubmitting) return;

			let firstUnansweredIndex = -1;
			this.list.forEach((l, i) => {
				const isAnswered = !!l.answer;
				this.$set(l, 'warn', !isAnswered);
				if (!isAnswered && firstUnansweredIndex === -1) {
					firstUnansweredIndex = i;
				}
			});

			if (firstUnansweredIndex > -1) {
				uni.showModal({
					title: '提示',
					content: `第 ${firstUnansweredIndex + 1} 项未选择答案，请选择。`,
					showCancel: false,
					success: (res) => {
						if (res.confirm) {
							// 调用新的滚动方法
							this.scrollToQuestion(firstUnansweredIndex);
						}
					}
				});
				return; // 终止提交
			}

			const submitList = this.list.map((question) => {
				const formattedUserAnswer = question.userAnswer.map((option) => ({
					...option,
					isSelected: option.questionOption === question.answer
				}));
				const { answer, warn, ...restOfQuestion } = question;
				return {
					...restOfQuestion,
					isAnswer: '1',
					userAnswer: formattedUserAnswer
				};
			});

			this.isSubmitting = true;
			this.$api
				.post('/core/team/member/answer/submit', submitList)
				.then((res) => {
					if (res.data.code !== 0) {
						this.isSubmitting = false;
						return this.$showToast(res.data.msg);
					}
					uni.removeStorageSync('questionnaire');
					uni.redirectTo({
						url: '/pages/questionnaireResult'
					});
				})
				.catch((err) => {
					this.$showToast('网络异常，请稍后重试');
				})
				.finally(() => {
					this.isSubmitting = false;
				});
		},
		setQuestionnaireCache() {
			const answeredList = this.list.filter((l) => l.answer).map((l) => ({ id: l.id, answer: l.answer }));

			if (answeredList.length === 0) {
				uni.removeStorageSync('questionnaire');
				return;
			}

			const qinfo = {
				key: this.teamQuestionnaireId,
				list: answeredList
			};
			uni.setStorageSync('questionnaire', JSON.stringify(qinfo));
		}
	}
};
</script>

<style scoped lang="less">
.loading-container {
	width: 100%;
	height: 100%;
}
.page {
	background: #f7f2f6;
	box-sizing: border-box;
	/* 【重要】让页面本身不可滚动，所有滚动都交给scroll-view处理 */
	height: 100vh;
	overflow: hidden;
	display: flex;
	flex-direction: column;

	.top {
		p {
			font-family: PingFang-SC, PingFang-SC;
			font-weight: bold;
			font-size: 42rpx;
			color: #252525;
			line-height: 51rpx;
			text-align: center;
			margin-top: 48rpx;
		}
		.tip {
			font-family: PingFangSC, PingFang SC;
			font-weight: 400;
			font-size: 26rpx;
			color: #646464;
			line-height: 26rpx;
			text-align: center;
			margin-top: 36rpx;
			span {
				margin: 0 10rpx;
			}
		}
	}

	.list {
		width: 100%;
		/* flex: 1;  如果使用flex布局，可以这样自适应高度 */
		/* overflow-y: auto;  scroll-view自带滚动，无需此属性 */
		margin-top: 28rpx;
		.l_item {
			margin-top: 20rpx;
			width: 100%;
			background: #ffffff;
			padding: 6rpx;
			box-sizing: border-box;

			&:first-child {
				margin-top: 0;
			}
		}
	}

	.bottom {
		width: calc(100% - 80rpx);
		height: 88rpx;
		position: fixed;
		left: 40rpx;
		bottom: 40rpx;
	}
}
</style>
