/**
 * 营地业务逻辑模块
 * 负责营地相关的业务操作
 */

import { campApi } from '../../../config/camp_api.js';
import * as dataFetcher from './data-fetcher.js';

/**
 * 加入营地
 * @param {Object} context - 页面上下文
 */
export function joinCamp(context) {
	var campId = context.data.campId;
	if (!campId) return;

	wx.showLoading({ title: '加入中...' });

	campApi.joinCamp(campId)
		.then(function (res) {
			wx.hideLoading();
			if (res.success === true) {
				wx.showToast({
					title: res.message || '加入成功',
					icon: 'success'
				});
				context.setData({ hasJoined: true });
				
				// 加入成功后，自动开启第一小节（购买第一小节）
				var courseList = context.data.courseList || [];
				if (!courseList || courseList.length === 0) {
					dataFetcher.fetchCampData(context, campId);
					return;
				}

				// 选择第一小节：优先按 section_number 升序，否则取数组第一个
				var first = courseList.slice().sort(function(a,b){
					var an = a.section_number || a.number || 0;
					var bn = b.section_number || b.number || 0;
					return an - bn;
				})[0];
				var firstSectionId = first && (first.id || first.section_id || first.course_id);
				if (!firstSectionId) {
					dataFetcher.fetchCampData(context, campId);
					return;
				}

				// 自动开启第一小节
				campApi.purchaseSection(campId, firstSectionId)
					.then(function(purRes){
						if (purRes && (purRes.success === true || purRes.code === 200)) {
							wx.showToast({ title: purRes.message || '已开启第一小节', icon: 'success' });
						} else {
							wx.showToast({ title: (purRes && purRes.message) || '开启第一小节失败', icon: 'none' });
						}
					})
					.finally(function(){
						dataFetcher.fetchCampData(context, campId);
					});
			} else {
				wx.showToast({
					title: res.message || '加入失败',
					icon: 'none'
				});
			}
		})
		.catch(function (err) {
			wx.hideLoading();
			wx.showToast({
				title: '加入失败',
				icon: 'none'
			});
		});
}

/**
 * 检查并开启小节
 * @param {Object} context - 页面上下文
 * @param {String} sectionId - 小节ID
 * @param {Function} callback - 回调函数
 * @param {Boolean} showPaymentModal - 是否显示支付提示弹窗
 */
export function checkAndUnlockSection(context, sectionId, callback, showPaymentModal) {
	var campId = context.data.campId;
	var accessList = context.data.accessList || [];
	var courseList = context.data.courseList || [];
	
	if (showPaymentModal === undefined) {
		showPaymentModal = false;
	}
	
	if (!sectionId || !campId) {
		if (callback) callback(false);
		return Promise.resolve(false);
	}
	
	// 检查 section_id 是否在 accessList 中
	var hasAccess = accessList.some(function (item) {
		return String(item.section_id) === String(sectionId);
	});
	
	if (hasAccess) {
		if (callback) callback(true);
		return Promise.resolve(true);
	}
	
	// 查找小节信息
	var section = courseList.find(function (item) {
		return String(item.id) === String(sectionId) ||
			   String(item.section_id) === String(sectionId) ||
			   String(item.course_id) === String(sectionId);
	});

	if (!section) {
		if (callback) callback(false);
		return Promise.resolve(false);
	}

	// 先请求后端判断是否允许开启（上一小节是否完成等）
	return campApi.canUnlockSection(campId, sectionId)
		.then(function (res) {
			var ok = res && (res.success === true || res.code === 200);
			var canUnlock = ok && (res.can_unlock === true);
			var msg = (res && res.message) ? res.message : '请先完成上一小节';

			if (!ok) {
				wx.showToast({ title: msg || '检查失败', icon: 'none' });
				if (callback) callback(false);
				return false;
			}
			if (!canUnlock) {
				wx.showModal({
					title: '提示',
					content: msg,
					showCancel: false,
					confirmText: '知道了'
				});
				if (callback) callback(false);
				return false;
			}
			return true;
		})
		.then(function (allowed) {
			if (allowed !== true) {
				return Promise.resolve(false);
			}

			var priceFen = section.price_fen || section.price || 0;
			var isPurchased = section.is_purchased || false;
			var needPayment = priceFen > 0 && !isPurchased;
			var sectionTitle = section.title || section.course_title || '小节';

			if (needPayment) {
				if (showPaymentModal) {
					var priceYuan = (priceFen / 100).toFixed(2);
					wx.showModal({
						title: '提示',
						content: '开启小节👉' + sectionTitle + '？\n需要支付' + priceYuan + '元',
						success: function (res) {
							if (res.confirm) {
								wx.showLoading({ title: '准备支付...' });
								if (context.createOrderAndPay) {
									context.createOrderAndPay(sectionId, priceFen, section)
										.then(function (success) {
											wx.hideLoading();
											if (success) {
												dataFetcher.fetchCampData(context, campId);
												if (callback) callback(true);
												return true;
											} else {
												if (callback) callback(false);
												return false;
											}
										})
										.catch(function (err) {
											wx.hideLoading();
											if (callback) callback(false);
											return false;
										});
								}
							} else {
								if (callback) callback(false);
							}
						}
					});
					return Promise.resolve(false);
				} else {
					if (callback) callback(false);
					return Promise.resolve(false);
				}
			} else {
				// 不需要支付，直接调用 purchaseSection
				wx.showLoading({ title: '开启中...' });
				return campApi.purchaseSection(campId, sectionId)
					.then(function (res) {
						wx.hideLoading();
						if (res && (res.success === true || res.code === 200)) {
							wx.showToast({
								title: res.message || '已开启小节',
								icon: 'success'
							});
							dataFetcher.fetchCampData(context, campId);
							if (callback) callback(true);
							return true;
						} else {
							wx.showToast({
								title: (res && res.message) || '开启小节失败',
								icon: 'none'
							});
							if (callback) callback(false);
							return false;
						}
					})
					.catch(function (err) {
						wx.hideLoading();
						wx.showToast({
							title: '开启小节失败',
							icon: 'none'
						});
						if (callback) callback(false);
						return false;
					});
			}
		});
}

/**
 * 切换章节展开/收起（仅做展开/收起，不触发支付、解锁等任何其他操作）
 * @param {Object} context - 页面上下文
 * @param {Object} e - 事件对象
 */
export function toggleSection(context, e) {
	var course = e.currentTarget.dataset.course;
	var index = e.currentTarget.dataset.index;

	var sections = context.data.sections;
	var isCurrentlyExpanded = sections[index] && sections[index].expanded;
	var willExpand = !isCurrentlyExpanded;

	var newSections = sections.slice();
	newSections[index] = Object.assign({}, newSections[index], {
		expanded: willExpand
	});
	context.setData({
		sections: newSections
	});
}

/**
 * 重启打卡营
 * @param {Object} context - 页面上下文
 */
export function restartCamp(context) {
	var campId = context.data.campId;
	wx.showModal({
		title: '提示',
		content: "确认重启打卡营吗？\n 重启打卡营后将会清空所有答题记录，已购买的课程不会重复收费！",
		success: function (res) {
			if (res.confirm) {
				var allCompleted = context.data.courseList.every(function (item) {
					return item.is_completed;
				});

				if (!allCompleted) {
					wx.showModal({
						title: '提示',
						content: '完成所有小节课程后才能重启打卡营！！',
						showCancel: false,
						confirmText: '知道了',
						confirmColor: '#333'
					});
					return;
				}
				
				var userId = wx.getStorageSync('wxuserid') || '';
				wx.showLoading({ title: '重启中...' });
				
				campApi.resetCampProgress(campId, userId, true).then(function (res) {
					wx.hideLoading();
					if (res.success === true || res.code === 200) {
						wx.showToast({
							title: res.message || '重启成功',
							icon: 'success'
						});
						context.setData({
							hasVideoPlayed: false,
							isAutoPlay: true,
							_isDataLoaded: false
						});
						dataFetcher.fetchCampData(context, campId);
					} else {
						wx.showToast({
							title: res.message || '重启失败',
							icon: 'none'
						});
					}
				})
				.catch(function (err) {
					wx.hideLoading();
					wx.showToast({
						title: '重启失败',
						icon: 'none'
					});
				});
			}
		}
	});
}