<template>
	<view class="ezy-xuexi-page">
		<view class="icon-title-navBar-box">
			<text class="nav-bar-title">学习</text>
		</view>
		<view v-if="existData" class="ezy-page-body xuexi-page-body">
			<view class="xxjl-card-box-padding">
				<view class="xxjl-card-box">
					<!-- 显示内容 -->
					<view class="card-body-box">
						<img :src="banbenInfo.cover" />
						<view class="body-right">
							<view class="right-name">{{ banbenInfo.chanpinName }}</view>
							<view>等级：{{banbenInfo.dengjiName}}</view>
							<view>版本：{{banbenInfo.name}}</view>
							<view>单元：{{banbenInfo.curDanyuanName}}</view>
							<view>课程：{{banbenInfo.curKechengName}}</view>
						</view>
					</view>
					<view class="card-progress-box">
						<view class="xx-progress-box">
							<view>学习进度</view>
							<progress :percent="curProcess" class="xx-progress" stroke-width="20"
								backgroundColor="#3c7dfd" activeColor="#ffd11c" />
						</view>
						<ezyActiveVue class="ezy-btn-active jxxx-btn" @aclick="handlePlay(banbenInfo,'jixu')"></ezyActiveVue>
					</view>
				</view>
				</view>
					<view class="xx-item-list">
						<view class="xx-item-title">— 以下为当前等级课程目录 —</view>
						<view v-for="(danyuanItem,index) in danyuanList" :key="danyuanItem.danyuanId">
							<!-- 第一单元 v-if="index ==0"-->
								<ezyActiveVue class="ezy-list-item-active item-dy-box" @aclick="handleClickDanyuan(danyuanItem)" :id="`unit-title-${danyuanItem.danyuanId}`">
									<view class="dy-left-box">L{{banbenInfo.dengjiId}}</view>
									<view class="dy-right-box">
										<view class="right-content">
											<view class="dy-name">{{danyuanItem.danyuanName}}</view>
											<view>{{danyuanItem.danyuanIntro}}</view>
										</view>
									</view>
								</ezyActiveVue>
							<!-- 其他单元 -->
							<!-- <view v-if="index !=0" class="xx-item-title" :id="`unit-title-${danyuanItem.danyuanId}`">— {{danyuanItem.danyuanName}}
								{{danyuanItem.danyuanIntro}} —
							</view> -->
						

							<ezyActiveVue class="ezy-list-item-active xx-item-box" v-for="jieItem in danyuanItem.jieList" :key="jieItem.jieId"
								@aclick="handlePlay(jieItem,'play')">
								<view class="xx-item-status"
									:class="jieItem.wanchengFlag == 1 ? 'completed-status' : 'uncompleted-status'">
								</view>
								<img :src="jieItem.cover" />
								<view class="xx-text-box">
									<view>{{ jieItem.jieName }}</view>
									<view>{{ jieItem.jieIntro }}</view>
								</view>
								<view class="xx-item-btn"></view>
							</ezyActiveVue>


						</view>
					</view>

				<!-- 回到顶部 -->
				<view class="go-top-btn" v-if="false"></view>
				
			</view>
			<view v-if="!existData">

			</view>

		<danyuanInfoVue ref="dyRef" v-if="isShow" @close="isShow= false"></danyuanInfoVue>
		<custom-tab-bar :show="true" :current-index="currentTabIndex" />
		
	</view>
</template>

<script>
	import ezyActiveVue from "@/components/ezyActive/ezyActive.vue";
	import CustomTabBar from '@/components/custom-tabbar/index.vue';
	import cacheManager from "@/utils/cacheManager.js";
	import {
		shuxueChanpinBanbenInfo,
		shuxueSave
	} from "@/api/chanpinneirong.js"
	import {
		onLoad,
		onShow,
		onHide,
		onUnload
	} from "@dcloudio/uni-app"
	import danyuanInfoVue from '@/pages/xinshuxue/components/danyuanInfo.vue';
	import {
		toast
	} from '../../utils/common';
  import {updateXuexiProcess} from "./useNeirongShuxue"
	export default {
		data() {
			return {
				canExitApp: false,

				danyuanList: [],
				currentUnitName: "",
				isShow: true,
				banbenInfo: {},
				banbenId: '',
				danyuanId: '',
				chanpinId: '',
				dengjiId: '',
				curProcess: '',
				currentTabIndex: 1,
				cacheManagerLocal: null,
				hasCache: false, // 是否有缓存的标志
				needRefresh: false, // 是否需要刷新数据的标志
				existData: true,

				currentVisibleUnit: '', // 当前可见的单元名称
				observer: null, // IntersectionObserver实例
				lastToastUnitId: null ,// 上一次toast的单元ID，防止重复触发
				isFixed:false,
			}
		},
		components: {
			CustomTabBar,
			danyuanInfoVue,
			ezyActiveVue
		},
		onShow() {
			this.currentTabIndex = 1
			const cacheData = cacheManager.get('xuexi-shuxue');

			if (cacheData) {
				console.log('使用缓存数据');
				this.updateFromCache();
			} else {
				console.log('重新请求数据');
				this.hasCache = false;
				const cacheDataAuth = cacheManager.get('auth');
				this.initFromOptions(cacheDataAuth);
			}

			// 数据加载完成后初始化观察器
			this.$nextTick(() => {
				setTimeout(() => {
					this.initObserver();
				}, 300);
			});
		},
		onHide() {
			console.log('学习页面隐藏')
			this.needRefresh = true;
			// 销毁观察器
			if (this.observer) {
				this.observer.disconnect();
				this.observer = null;
			}
		},
		onUnload() {
			// 页面卸载时销毁观察器
			if (this.observer) {
				this.observer.disconnect();
				this.observer = null;
			}
		},
		onLoad(options) {
			uni.hideTabBar()
		},
		methods: {
			// 初始化IntersectionObserver
			initObserver() {
			  if (this.observer) {
			    this.observer.disconnect();
			    this.observer = null;
			  }
			  
			  // 监听每个单元标题的位置
			  this.observer = uni.createIntersectionObserver(this).relativeToViewport({
			    top: 0,  // 监听进入屏幕顶部的标题
			    bottom: 0
			  });
			  
			  this.danyuanList.forEach((item, index) => {
			    const titleId = `unit-title-${item.danyuanId}`;
			    this.observer.observe(`#${titleId}`, (res) => {
			      if (res.intersectionRatio > 0) {
			        // 标题在屏幕顶部区域内
			        if (this.lastToastUnitId !== item.danyuanId) {
			          this.lastToastUnitId = item.danyuanId;
			          console.log(`显示${item.danyuanName}`);
			          
						console.log('item',item);
						if(item.danyuanName !="第一单元"){
							this.isFixed = true 
						}else{
							this.isFixed = false
						}
			          // uni.showToast({
			          //   title: `${item.danyuanName}`,
			          //   icon: 'none',
			          //   duration: 1500
			          // });
			        }
			      }
			    });
			  });
			  
			  // 页面初始时显示第一个单元
			  if (this.danyuanList.length > 0) {
			    this.lastToastUnitId = this.danyuanList[0].danyuanId;
			  }
			},

			// 从参数初始化方法
			initFromOptions(options) {
				console.log('options', options);
				this.chanpinId = options.chanpinId;
				this.danyuanId = options.danyuanId;
				this.banbenId = options.banbenId;
				this.dengjiId = options.dengjiId;
				this.loadDataFromApi();
			},
			// 从缓存更新数据方法
			updateFromCache() {
				updateXuexiProcess()
				const cacheData = cacheManager.get('xuexi-shuxue');
				console.log('cacheData 从缓存更新数据方法', cacheData);
				if (cacheData) {
					this.banbenInfo = {
						...cacheData
					};
					this.curProcess = cacheData.curProcess;
					this.danyuanList = [...(cacheData.danyuanList || [])];

					// 数据更新后重新初始化观察器
					this.$nextTick(() => {
						setTimeout(() => {
							this.initObserver();
						}, 300);
					});
				}
			},

			shouldUseCache(options, cacheData) {
				if (options.banbenId && cacheData.banbenId === options.banbenId) {
					return true;
				}
				return false;
			},
			// 改成了
			loadDataFromApi() {
				this.banbenInfo = {}
				this.curProcess = ''
				this.danyuanList = []
				const req = {
					banbenId: this.banbenId
				}
				shuxueChanpinBanbenInfo(req).then(res => {
					if (res.code === 0) {
						this.banbenInfo = res.data;
						this.curProcess =res.data.curProcess * 100;
						this.danyuanList = res.data.danyuanList || [];

						if (!this.danyuanList) {
							this.existData = false
						}
						// 保存到缓存（新增了参数保存）
						const cacheData = {
							...res.data,
							banbenId: this.banbenId,
							chanpinId: this.chanpinId,
							danyuanId: this.danyuanId,
							dengjiId: this.dengjiId
						};
						cacheManager.set('xuexi-shuxue', cacheData);
						this.hasCache = true;

						// 更新全局auth信息
						cacheManager.updateObject('auth', {
							chanpinId: res.data.chanpinId,
							banbenId: this.banbenId,
							danyuanId: res.data.curDanyuanId,
							dengjiId: res.data.dengjiId
						});
						this.danyuanId = res.data.curDanyuanId
						this.dengjiId = res.data.dengjiId
						this.chanpinId = res.data.chanpinId
						// 数据加载完成后初始化观察器
						this.$nextTick(() => {
							setTimeout(() => {
								this.initObserver();
							}, 300);
						});
					}
				}).catch(res => {
					cacheManager.remove("xuexi-shuxue");
					this.hasCache = false;
					toast("加载失败，请重试");
				});
			},
			getJieAndDanyuan(data, jieId) {
				// 循环单元
				for (let danyuan of data.danyuanList) {
					// 循环节
					for (let jie of danyuan.jieList) {
						if (jie.jieId == jieId) {
							return {
								danyuan: danyuan,
								jie: jie
							}
						}
					}
				}
				return null;
			},
			// 统一保存和跳转方法
			async saveAndNavigate(jieId, type,da, code) {
				if (code == 'jixu') { // 追加参数判断 非继续 [临时]
					if (!this.banbenId || !this.danyuanId) {
						toast("banbenId或者danyuanId 丢失")
						return false
					}
				}	 
			
				let req = {
					"banbenId": this.banbenId,
					"danyuanId": da.danyuanId, // 修改当时版本ID为数据内版本Id [临时]
					"jieId": jieId
				}

				try {
					const res = await shuxueSave(req);
					console.log('res', res);

					if (res.code == 0 && res.data) {
						let curJieAndDanyuan = this.getJieAndDanyuan(this.banbenInfo, jieId);
						console.log('curJieAndDanyuan', curJieAndDanyuan);

						if (!curJieAndDanyuan) {
							toast("未找到课程信息");
							return false;
						}

						// 更新缓存
						const cacheData = cacheManager.get('xuexi-shuxue') || {};
						cacheData.curDanyuanName = curJieAndDanyuan.danyuan.danyuanName;
						cacheData.curKechengName = curJieAndDanyuan.danyuan.danyuanIntro;
						cacheData.curJieId = jieId;
						cacheData.type = curJieAndDanyuan.jie.type;
						cacheManager.set('xuexi-shuxue', cacheData);

						// 跳转到学习页面
						if (type == 1) {
							uni.navigateTo({
								url: `/pages/xinshuxue/lookShipin?jieId=${jieId}`
							})
						} else {
							uni.navigateTo({
								url: `/pages/xinshuxue/unitTest?jieId=${jieId}`
							})
						}
					} else {
						toast("保存位置出错");
						return false;
					}
				} catch (error) {
					toast("保存失败");
					return false;
				}
			},
			handlePlay(da, code) {
				console.log('da', da);
				let jieId = null;
				if (code == 'jixu') {
					if (!da.curJieId) {
						toast("无课程ID");
						return;
					}
					jieId = da.curJieId;
				} else {
					jieId = da.jieId;
				}
				// [临时]
				this.saveAndNavigate(jieId, da.type, da, code);
			},
			handleClickDanyuan(item) {
				// 更新为点击的动态单元Id [临时]
				if (!item.danyuanId) {
					toast("this.danyuanId丢失")
					return false
				}
				this.isShow = true;
				setTimeout(() => {
					// 更新为点击的动态单元Id [临时]
					this.$refs.dyRef.handleShow(item.danyuanId)
				}, 100)
			},
			handleBack() {
				uni.navigateTo({
					url: `/pages/chanpinXuanze/banben?dengjiId=` + this.dengjiId
				})
			},
		}
	}
</script>

