/**
 * 数据获取模块
 * 负责所有数据获取相关的逻辑
 */

import { campApi } from '../../../config/camp_api.js';
import { generateExpandedStatus } from './utils.js';

/**
 * 顺序调用 purchaseSection 开启多个小节，完成后静默刷新营地数据（用于前一小节完成后自动开启后一小节）
 */
function openSectionsThenRefresh(context, campId, sectionIds, index, silent) {
	if (index >= sectionIds.length) {
		fetchCampData(context, campId, true);
		return;
	}
	var sectionId = sectionIds[index];
	campApi.purchaseSection(campId, sectionId)
		.then(function () {
			openSectionsThenRefresh(context, campId, sectionIds, index + 1, silent);
		})
		.catch(function () {
			openSectionsThenRefresh(context, campId, sectionIds, index + 1, silent);
		});
}

/**
 * 当上一小节已完成、下一小节未购买时，请求后端 canUnlockSection；若允许且免费则加入自动开启列表，最后统一 openSectionsThenRefresh
 */
function checkAndAutoOpenNextSections(context, campId, courseList, startIndex, toOpen, silent) {
	if (startIndex >= courseList.length) {
		if (toOpen.length > 0) {
			openSectionsThenRefresh(context, campId, toOpen, 0, silent);
		}
		return Promise.resolve();
	}
	var prev = courseList[startIndex - 1];
	var curr = courseList[startIndex];
	if (!prev.is_completed || curr.is_purchased) {
		return checkAndAutoOpenNextSections(context, campId, courseList, startIndex + 1, toOpen, silent);
	}
	return campApi.canUnlockSection(campId, curr.id)
		.then(function (res) {
			var ok = res && (res.success === true || res.code === 200);
			var canUnlock = ok && (res.can_unlock === true);
			var isFree = (curr.price_fen == null || curr.price_fen === undefined || curr.price_fen <= 0);
			if (canUnlock && isFree) {
				toOpen.push(curr.id);
			}
			return checkAndAutoOpenNextSections(context, campId, courseList, startIndex + 1, toOpen, silent);
		})
		.catch(function () {
			return checkAndAutoOpenNextSections(context, campId, courseList, startIndex + 1, toOpen, silent);
		});
}

/**
 * 为「未购买」或「有时间间隔且非第一节」的小节请求 can_unlock_section，若返回 can_unlock=false 且 unlock_at 则写入 sectionUnlockAtMap 供页面倒计时展示并禁止进入
 * 注意：已购买但配置了时间间隔的小节也可能未到解锁时间（如 1 小时未到），需同样请求以展示倒计时并拦截点击
 */
function fetchUnlockAtForLockedSections(context, campId, courseList) {
	var map = {};
	var promises = [];
	for (var i = 0; i < courseList.length; i++) {
		var course = courseList[i];
		var needUnlockCheck = !course.is_purchased ||
			(course.time_interval_type && course.time_interval_value > 0 && (course.section_number || 0) > 1);
		if (!needUnlockCheck) { continue; }
		(function (sectionId) {
			promises.push(
				campApi.canUnlockSection(campId, sectionId).then(function (res) {
					var unlockAt = res && (res.unlock_at !== undefined && res.unlock_at !== null) ? parseInt(res.unlock_at, 10) : null;
					if (unlockAt && !isNaN(unlockAt) && res.can_unlock === false) {
						map[sectionId] = unlockAt;
					}
				}).catch(function () {})
			);
		})(course.id);
	}
	Promise.all(promises).then(function () {
		if (Object.keys(map).length > 0) {
			context.setData({ sectionUnlockAtMap: map });
			if (typeof context.startUnlockCountdownTimer === 'function') {
				context.startUnlockCountdownTimer();
			}
		}
	});
}

/**
 * 轻量级刷新任务状态（已废弃）
 * 注意：此函数已不再使用，因为聚合接口 camp_detail_with_user_status 已经返回了完整的任务状态
 * 如果需要更新任务状态，请使用 fetchCampData 重新加载完整数据
 * @deprecated 不再使用单独的 progress/list 接口
 */
export function refreshTaskStatus(context) {
	// 此函数已废弃，不再执行任何操作
	// 如果需要刷新任务状态，请调用 fetchCampData 重新加载完整数据
}

/**
 * 获取所有营地数据（仅在首次加载时使用）
 * @param {Object} context - 页面上下文
 * @param {String} campId - 打卡营ID
 * @param {Boolean} silent - 是否静默更新（不显示 loading）
 */
export function fetchCampData(context, campId, silent) {
	if (!campId) {
		wx.showToast({
			title: '营地ID不能为空',
			icon: 'none'
		});
		return;
	}

	if (silent !== true) {
		context.setData({ loading: true });
	}

	var userId = wx.getStorageSync('wxuserid') || '';

	// 使用新的聚合接口
	campApi.getCampDetailWithUserStatus(campId, userId)
		.then(function (res) {
			if (!res || res.success !== true) {
				throw new Error(res && res.message || '获取数据失败');
			}

			var campDetail = res.camp_detail || {};
			var camp = campDetail.camp || {};
			var userCamp = campDetail.user_camp || {};
			var sections = res.sections || [];

			// 处理介绍类型和内容
			var introTypeNormalized = (function(raw) {
				if (raw === null || raw === undefined) return 'INTRO_TYPE_NONE';
				if (typeof raw === 'number') {
					if (raw === 2) return 'INTRO_TYPE_VIDEO';
					if (raw === 1) return 'INTRO_TYPE_IMAGE_TEXT';
					return 'INTRO_TYPE_NONE';
				}
				var str = String(raw).toUpperCase();
				if (str === '2' || str.indexOf('VIDEO') !== -1) return 'INTRO_TYPE_VIDEO';
				if (str === '1' || str.indexOf('IMAGE_TEXT') !== -1 || str.indexOf('IMAGETEXT') !== -1) return 'INTRO_TYPE_IMAGE_TEXT';
				return 'INTRO_TYPE_NONE';
			})(camp.intro_type);

			var introContent = camp.intro_content || '';
			var isVideo = introTypeNormalized === 'INTRO_TYPE_VIDEO' && introContent;

			// 获取当前学习的小节ID
			var currentSectionId = null;
			if (userCamp.is_joined === true && userCamp.current_section_id) {
				currentSectionId = String(userCamp.current_section_id);
			}

			// 转换打卡营状态
			var campStatus = 'NotStarted';
			if (userCamp.camp_status) {
				var statusStr = String(userCamp.camp_status).toUpperCase();
				if (statusStr.indexOf('COMPLETED') !== -1) {
					campStatus = 'Completed';
				} else if (statusStr.indexOf('IN_PROGRESS') !== -1 || statusStr.indexOf('INPROGRESS') !== -1) {
					campStatus = 'InProgress';
				}
			}

			// 构建访问列表（从 sections 中提取已购买的小节）
			var accessList = [];
			sections.forEach(function (sec) {
				if (sec.is_purchased === true) {
					accessList.push({
						section_id: sec.id
					});
				}
			});

			// 处理小节列表（sections 已经包含任务列表和进度信息）
			var courseList = sections.map(function (sec) {
				var tasks = sec.tasks || [];
				
				// 处理每个任务的状态，确保审核被拒绝的任务正确显示
				tasks.forEach(function(task) {
					if (!task) return;
					// 兼容后端解锁关系：若有 prerequisite_task_id 但无 prerequisites，则生成数组供点击逻辑使用
					if ((!task.prerequisites || task.prerequisites.length === 0) && task.prerequisite_task_id) {
						task.prerequisites = [task.prerequisite_task_id];
					}
					if (!task.prerequisites) {
						task.prerequisites = [];
					}
					
					// 判断任务类型（只有主观题和申论题需要审核）
					var taskType = String(task.task_type || '').toLowerCase();
					var isReviewableTask = taskType === 'subjective' || taskType === 'essay' || task.need_review === true;
					
					// 只有需要审核的任务才检查 review_status
					if (isReviewableTask && task.progress && task.progress.review_status) {
						var reviewStatus = task.progress.review_status;
						var reviewStatusUpper = String(reviewStatus).toUpperCase();
						
						// 如果审核状态是 rejected，无论其他状态如何，都应该显示为 Rejected
						if (reviewStatusUpper === 'REJECTED' || reviewStatus === 'rejected' || 
							reviewStatusUpper === 'REVIEW_STATUS_REJECTED') {
							task.status = 'Rejected';
						} else if (reviewStatusUpper === 'APPROVED' || reviewStatus === 'approved' || 
							reviewStatusUpper === 'REVIEW_STATUS_APPROVED') {
							// 审核通过，如果已完成则显示 Completed，否则显示 InProgress
							if (task.progress.is_completed === true || task.progress.is_completed === 1) {
								task.status = 'Completed';
							} else {
								task.status = 'InProgress';
							}
						} else if (reviewStatusUpper === 'PENDING' || reviewStatus === 'pending' || 
							reviewStatusUpper === 'REVIEW_STATUS_PENDING') {
							// 待审核状态
							if (task.progress.is_completed === true || task.progress.is_completed === 1) {
								task.status = 'Reviewing';
							} else {
								task.status = 'InProgress';
							}
						}
					}
					
					// 规范化状态值（确保大小写正确）
					if (task.status) {
						var normalizedStatus = String(task.status).trim();
						if (normalizedStatus === 'NotStarted' || normalizedStatus === 'InProgress' || 
							normalizedStatus === 'Completed' || normalizedStatus === 'Reviewing' || 
							normalizedStatus === 'Rejected') {
							task.status = normalizedStatus;
						} else {
							// 如果状态值不在预期范围内，尝试转换
							var statusUpper = normalizedStatus.toUpperCase();
							if (statusUpper.indexOf('COMPLETED') !== -1) {
								task.status = 'Completed';
							} else if (statusUpper.indexOf('REVIEWING') !== -1) {
								task.status = 'Reviewing';
							} else if (statusUpper.indexOf('REJECTED') !== -1) {
								task.status = 'Rejected';
							} else if (statusUpper.indexOf('INPROGRESS') !== -1 || statusUpper.indexOf('IN_PROGRESS') !== -1) {
								task.status = 'InProgress';
							} else if (statusUpper.indexOf('NOTSTARTED') !== -1 || statusUpper.indexOf('NOT_STARTED') !== -1) {
								task.status = 'NotStarted';
							} else {
								// 无法识别，默认为 NotStarted
								task.status = 'NotStarted';
							}
						}
					} else {
						// 如果没有 status 字段，默认为 NotStarted
						task.status = 'NotStarted';
					}
				});
				
				// 根据实际的 tasks 数组重新计算 section_progress，确保数据正确
				var totalTasks = tasks.length;
				var completedTasks = 0;
				
				// 统计已完成的任务数（状态为 Completed 的任务）
				tasks.forEach(function(task) {
					if (task.status === 'Completed') {
						completedTasks++;
					}
				});
				
				// 重新计算 section_progress
				var sectionProgress = {
					section_id: sec.id,
					total_tasks: totalTasks,
					completed_tasks: completedTasks,
					is_completed: totalTasks > 0 && completedTasks === totalTasks
				};
				
				// 如果后端返回的 is_completed 状态与计算的不一致，使用计算的结果
				var isCompleted = sectionProgress.is_completed;
				
				return {
					id: sec.id,
					title: sec.title,
					section_number: sec.section_number,
					price_fen: sec.price_fen,
					is_purchased: sec.is_purchased || false,
					is_started: sec.is_started || false,
					is_completed: isCompleted,
					is_current: sec.is_current || false,
					require_previous_section: sec.require_previous_section || false,
					time_interval_type: sec.time_interval_type,
					time_interval_value: sec.time_interval_value,
					tasks: tasks,
					section_progress: sectionProgress
				};
			});

			// 查找并维护当前小节信息（优先使用 is_current，其次使用 current_section_id）
			var currentSection = null;
			if (courseList && courseList.length > 0) {
				// 优先通过 is_current 查找
				currentSection = courseList.find(function (sec) {
					return sec.is_current === true;
				});
				
				// 如果通过 is_current 找不到，则通过 current_section_id 查找
				if (!currentSection && currentSectionId) {
					currentSection = courseList.find(function (sec) {
						return String(sec.id) === String(currentSectionId) ||
							   String(sec.section_id) === String(currentSectionId) ||
							   String(sec.course_id) === String(currentSectionId);
					});
				}
				
				if (currentSection) {
				}
			}
			
			// 检查当前是否正在播放任务视频
			// 如果正在播放任务视频，保留视频播放状态，不要重置
			var currentPlayingTaskId = context.data.currentPlayingTaskId;
			var currentPlayingTaskType = context.data.currentPlayingTaskType;
			var isPlayingTaskVideo = currentPlayingTaskId && currentPlayingTaskType === 'TASK_TYPE_VIDEO';
			var shouldShowVideo = isVideo || (isPlayingTaskVideo && context.data.showVideo === true);
			
			// 构建返回数据
			var newData = {
				loading: silent === true ? context.data.loading : false,
				hasJoined: userCamp.is_joined || false,
				showVideo: shouldShowVideo,
				topContent: isPlayingTaskVideo ? context.data.topContent : introContent,
				backTopContent: introContent,
				topContentType: isPlayingTaskVideo ? context.data.topContentType : introTypeNormalized,
				introType: introTypeNormalized,
				campStatus: campStatus,
				currentSectionId: currentSectionId,
				currentSection: currentSection, // 维护当前小节信息
				campInfo: {
					title: camp.title || '营地详情',
					desc: camp.description || '',
					cover_image: camp.cover_image || ''
				},
				courseList: courseList,
				accessList: accessList,
				hasLogged10Percent: isPlayingTaskVideo ? context.data.hasLogged10Percent : false,
				sectionUnlockAtMap: {},
				sectionUnlockTexts: []
			};

			// 如果正在播放任务视频，保留当前的 bannerVideoUrl
			if (isPlayingTaskVideo && context.data.bannerVideoUrl) {
				newData.bannerVideoUrl = context.data.bannerVideoUrl;
			} else if (isVideo) {
				newData.bannerVideoUrl = introContent;
			} else {
				newData.bannerVideoUrl = '';
			}
			
			// 如果正在播放任务视频，保留视频相关的其他状态
			if (isPlayingTaskVideo) {
				newData.currentPlayingTaskId = context.data.currentPlayingTaskId;
				newData.currentPlayingTaskType = context.data.currentPlayingTaskType;
				newData.videoTitle = context.data.videoTitle;
				newData.currentVideoCompletionPercent = context.data.currentVideoCompletionPercent;
				newData.videoCompletionMap = context.data.videoCompletionMap || {};
				newData.isAutoPlay = context.data.isAutoPlay;
				newData._pendingVideoPlay = context.data._pendingVideoPlay;
			}

			// 一次性更新所有数据
			context.setData(newData);
			
			// 标记数据已加载
			context.setData({ _isDataLoaded: true });

			// 生成展开状态
			if (courseList.length > 0) {
				generateExpandedStatus(context);
			}

			// 未购买的小节请求 can_unlock_section，若有 unlock_at 则用于小节倒计时
			if (userCamp.is_joined === true && courseList && courseList.length > 0) {
				fetchUnlockAtForLockedSections(context, campId, courseList);
			}

			// 当小节内最后一个任务完成时，后端会在 progress/update 时自动检查并开启下一小节（若无限制且免费）；
			// 此处作为兜底：拉取营地数据后若发现上一节已完成、下一节未购买且可解锁免费，则再请求开启
			if (userCamp.is_joined === true && courseList && courseList.length > 1) {
				checkAndAutoOpenNextSections(context, campId, courseList, 1, [], silent);
			}
		})
		.catch(function (error) {
			wx.showToast({
				title: error && error.message || '获取数据失败',
				icon: 'none'
			});
			context.setData({ loading: false });
		});
}