/**
 * 申论题任务服务模块
 * 负责任务详情和进度相关的 API 调用
 */

import { campApi } from '../../../config/camp_api.js';
import { questionApi } from '../../../config/question_api.js';

/**
 * 静默获取用户任务进度
 * @param {String} userId - 用户ID
 * @param {String} taskId - 任务ID
 * @returns {Promise} 任务进度
 */
export function fetchProgressSilent(userId, taskId) {
	// 使用 Fiber 后端的接口
	return campApi.getProgressDetail(userId, taskId).then(function(res) {
		// 统一返回格式
		if (res && res.success === true) {
			return res;
		} else if (res && res.code === 200) {
			return {
				success: true,
				progress: res.data || res.progress
			};
		}
		return res;
	}).catch(function(err) {
		// 静默失败，返回 null
		return null;
	});
}

/**
 * 获取任务详情
 * @param {String} taskId - 任务ID
 * @returns {Promise} 任务详情
 */
export function getTaskDetail(taskId) {
	return campApi.getTaskDetailById(taskId).then(function(taskDetail){
		if (!taskDetail || taskDetail.success !== true || !taskDetail.task) {
			return null;
		}
		
		var task = taskDetail.task;
		// 接口返回的 content 和 condition 是直接对象，不是嵌套在 essay 中
		var content = task.content || {};
		var condition = task.condition || {};
		
		// 兼容两种格式：直接在 content 中，或嵌套在 content.essay 中
		var paperId = content.exam_id || content.paper_id || null;
		if (!paperId && content.essay) {
			paperId = content.essay.exam_id || content.essay.paper_id || null;
		}
		
		// 兼容两种格式：直接在 condition 中，或嵌套在 condition.essay 中
		var needReview = !!condition.need_review;
		if (!needReview && condition.essay) {
			needReview = !!condition.essay.need_review;
		}
		
		return {
			paperId: paperId,
			needReview: needReview
		};
	});
}

/**
 * 获取试卷内容
 * @param {String} paperId - 试卷ID
 * @returns {Promise} 试卷数据
 */
export function fetchPaperData(paperId) {
	return questionApi.getPaperDetail(paperId).then(function(res){
		if (!res || res.success !== true || !res.paper) {
			throw new Error('获取试卷内容失败');
		}
		
		var paper = res.paper;
		var questions = paper.questions || [];
		
		var problems = questions.map(function(q) {
			return {
				problem_id: String(q.id),
				problem_content: q.content || q.title || '',
				title: q.title || '',
				type: q.type,
				material_id: q.material_id || null, // 保留题目关联的材料ID
				options: q.options || [],
				explanation: q.explanation || '',
				answer: q.answer || '',
				submittedImages: [],
				tempImages: [],
				totalImageCount: 0,
				allowResubmit: true,
				teacherFeedback: {
					comment: '',
					images: [],
					review_time: ''
				}
			};
		});
		
		// 提取 paper 级别的材料列表（与客观题页面保持一致）
		var materials = Array.isArray(paper.materials) ? paper.materials : [];
		
		return {
			problems: problems,
			materials: materials,
			title: paper.title || '作业详情'
		};
	});
}

/**
 * 提交答案（单题提交，保留用于兼容）
 * @param {String} userId - 用户ID
 * @param {String} taskId - 任务ID
 * @param {Array} answerImages - 答案图片URL数组
 * @returns {Promise} 提交结果
 */
export function submitAnswer(userId, taskId, answerImages) {
	const formatDateTimeString = (date) => {
		var d = date || new Date();
		var year = d.getFullYear();
		var month = String(d.getMonth() + 1).padStart(2, '0');
		var day = String(d.getDate()).padStart(2, '0');
		var hours = String(d.getHours()).padStart(2, '0');
		var minutes = String(d.getMinutes()).padStart(2, '0');
		var seconds = String(d.getSeconds()).padStart(2, '0');
		return year + '-' + month + '-' + day + ' ' + hours + ':' + minutes + ':' + seconds;
	};

	var submitData = {
		user_id: String(userId),
		task_id: String(taskId),
		is_completed: true,
		completed_at: formatDateTimeString(new Date()),
		answer_images: answerImages
	};

	return campApi.updateCampProgress(submitData);
}

/**
 * 申论题提交 / 暂存：按题目顺序提交答案图片；支持部分题目暂存（后端会与已有进度合并）
 * @param {String} userId - 用户ID
 * @param {String} taskId - 任务ID
 * @param {Array<Array<String>>} essayAnswerImages - 按题目顺序的答案图片数组，如 [ [url, url], [url], [] ]，空题可为 []
 * @param {Boolean} allFilled - 是否全部题目都已作答（用于设置 is_completed，不传则根据 essayAnswerImages 推断）
 * @returns {Promise} 提交结果
 */
export function submitEssayAnswer(userId, taskId, essayAnswerImages, allFilled) {
	const formatDateTimeString = (date) => {
		var d = date || new Date();
		var year = d.getFullYear();
		var month = String(d.getMonth() + 1).padStart(2, '0');
		var day = String(d.getDate()).padStart(2, '0');
		var hours = String(d.getHours()).padStart(2, '0');
		var minutes = String(d.getMinutes()).padStart(2, '0');
		var seconds = String(d.getSeconds()).padStart(2, '0');
		return year + '-' + month + '-' + day + ' ' + hours + ':' + minutes + ':' + seconds;
	};

	if (typeof allFilled !== 'boolean') {
		allFilled = (essayAnswerImages || []).every(function(arr) { return Array.isArray(arr) && arr.length > 0; });
	}

	var submitData = {
		user_id: String(userId),
		task_id: String(taskId),
		is_completed: allFilled,
		completed_at: formatDateTimeString(new Date()),
		essay_answer_images: essayAnswerImages,
		essay_question_count: essayAnswerImages.length
	};

	return campApi.updateCampProgress(submitData);
}