// 齐齐哈尔工程学院(qqhrit.com)拾光课程表适配脚本
// 基于正方教务系统接口适配
// 非该大学开发者适配,开发者无法及时发现问题
// 出现问题请提issues或者提交pr更改,这更加快速

/**
 * 解析周次字符串，处理单双周和周次范围。
 */
function parseWeeks(weekStr) {
    if (!weekStr) return [];

    const weekSets = weekStr.split(',');
    let weeks = [];

    for (const set of weekSets) {
        const trimmedSet = set.trim();

        const rangeMatch = trimmedSet.match(/(\d+)-(\d+)周/);
        const singleMatch = trimmedSet.match(/^(\d+)周/); // 匹配以数字周结束的

        let start = 0;
        let end = 0;
        let processed = false;

        if (rangeMatch) { // 范围, 如 "1-5周"
            start = Number(rangeMatch[1]);
            end = Number(rangeMatch[2]);
            processed = true;
        } else if (singleMatch) { // 单个周, 如 "6周"
            start = end = Number(singleMatch[1]);
            processed = true;
        }
        
        if (processed) {
            // 确定单双周
            const isSingle = trimmedSet.includes('(单)');
            const isDouble = trimmedSet.includes('(双)');

            for (let w = start; w <= end; w++) {
                if (isSingle && w % 2 === 0) continue; // 单周跳过偶数
                if (isDouble && w % 2 !== 0) continue; // 双周跳过奇数
                weeks.push(w);
            }
        }
    }

    // 去重并排序
    return [...new Set(weeks)].sort((a, b) => a - b);
}


/**
 * 独立处理课程时间逻辑的函数
 */
function applyCustomTimeLogic(courses) {
    // 方案1：周末全天
    const TIME_SCHEME_1 = [
        { number: 1, startTime: "08:20", endTime: "09:05" },
        { number: 2, startTime: "09:05", endTime: "09:50" },
        { number: 3, startTime: "10:00", endTime: "10:45" },
        { number: 4, startTime: "10:45", endTime: "11:30" },
        { number: 5, startTime: "13:30", endTime: "14:15" },
        { number: 6, startTime: "14:15", endTime: "15:00" },
        { number: 7, startTime: "15:20", endTime: "16:05" },
        { number: 8, startTime: "16:05", endTime: "16:50" },
        { number: 9, startTime: "18:00", endTime: "18:45" },
        { number: 10, startTime: "18:45", endTime: "19:30" },
        { number: 11, startTime: "19:30", endTime: "20:15" }
    ];

    // 方案2：2#/3# 专用（3-4节）
    const TIME_SCHEME_2 = [
        { number: 3, startTime: "10:20", endTime: "11:05" },
        { number: 4, startTime: "11:15", endTime: "12:00" }
    ];

    // 方案3：图/馆/齐三机床 专用（3-4节）
    const TIME_SCHEME_3 = [
        { number: 3, startTime: "09:55", endTime: "10:40" },
        { number: 4, startTime: "10:50", endTime: "11:35" }
    ];

    // 辅助函数：根据节次从方案中提取时间
    const getTimeFromScheme = (scheme, section) => {
        const slot = scheme.find(s => s.number === section);
        return slot ? [slot.startTime, slot.endTime] : null;
    };

    return courses.map(course => {
        const is23Sharp = /(2#|3#)/.test(course.position);
        const isLibMachine = /(图|馆|齐三机床)/.test(course.position);
        const isWeekend = (course.day === 6 || course.day === 7);
        const isSpecialPos = (is23Sharp || isLibMachine);
        
        const isEndpoint3or4 = (course.startSection === 3 || course.startSection === 4 || 
                                course.endSection === 3 || course.endSection === 4);
        
        const shouldApplyCustom = isWeekend || (isSpecialPos && isEndpoint3or4);

        if (shouldApplyCustom) {
            let startSlot, endSlot;

            if (isWeekend) {
                startSlot = TIME_SCHEME_1.find(s => s.number === course.startSection);
                endSlot = TIME_SCHEME_1.find(s => s.number === course.endSection);
            } else {
                // 工作日特殊教室逻辑
                const scheme = is23Sharp ? TIME_SCHEME_2 : TIME_SCHEME_3;
                
                // 辅助函数：如果是 3 或 4 节则取特殊方案，否则取全局标准时间
                const getSectionTime = (sec) => {
                    if (sec === 3 || sec === 4) {
                        return scheme.find(s => s.number === sec);
                    }
                    return TimeSlots.find(s => s.number === sec);
                };

                startSlot = getSectionTime(course.startSection);
                endSlot = getSectionTime(course.endSection);
            }

            // 如果成功找到了对应的开始和结束时间，则应用自定义时间
            if (startSlot && endSlot) {
                return {
                    ...course,
                    isCustomTime: true,
                    customStartTime: startSlot.startTime,
                    customEndTime: endSlot.endTime
                };
            }
        }
        
        return course;
    });
}




/**
 * 解析 API 返回的 JSON 数据。
 */
function parseJsonData(jsonData) {
    console.log("JS: parseJsonData 正在解析 JSON 数据...");
    
    // 检查JSON结构：新的数据在 kbList 字段中
    if (!jsonData || !Array.isArray(jsonData.kbList)) {
        console.warn("JS: JSON 数据结构错误或缺少 kbList 字段。");
        return []; 
    }

    const rawCourseList = jsonData.kbList;
    const finalCourseList = [];

    for (const rawCourse of rawCourseList) {
        // 关键字段检查： kcmc(课名), xm(教师), cdmc(教室), xqj(星期), jcs(节次范围), zcd(周次描述)
        if (!rawCourse.kcmc || !rawCourse.xm || !rawCourse.cdmc || 
            !rawCourse.xqj || !rawCourse.jcs || !rawCourse.zcd) {
            continue;
        }

        const weeksArray = parseWeeks(rawCourse.zcd);
        
        // 周次有效性检查
        if (weeksArray.length === 0) {
            continue;
        }
        
        // 解析节次范围，例如 "1-2"
        const sectionParts = rawCourse.jcs.split('-');
        const startSection = Number(sectionParts[0]);
        const endSection = Number(sectionParts[sectionParts.length - 1]); 

        const day = Number(rawCourse.xqj); // xqj: 星期几 (周一为1, 周日为7)
        
        // 数字有效性检查
        if (isNaN(day) || isNaN(startSection) || isNaN(endSection) || day < 1 || day > 7 || startSection > endSection) {
            // console.warn(`JS: 课程 ${rawCourse.kcmc} 星期或节次数据无效，跳过。`);
            continue;
        }

        finalCourseList.push({
            name: rawCourse.kcmc.trim(),
            teacher: rawCourse.xm.trim(),
            position: rawCourse.cdmc.trim(),
            day: day, 
            startSection: startSection,
            endSection: endSection, 
            weeks: weeksArray
        });
    }

    finalCourseList.sort((a, b) =>
        a.day - b.day ||
        a.startSection - b.startSection ||
        a.name.localeCompare(b.name)
    );

    // 课程时间特殊处理
    const processedCourses = applyCustomTimeLogic(finalCourseList);
    
    console.log(`JS: JSON 数据解析完成，共找到 ${finalCourseList.length} 门课程。`);
    return processedCourses;
}



function validateYearInput(input) {
    console.log("JS: validateYearInput 被调用，输入: " + input);
    if (/^[0-9]{4}$/.test(input)) {
        console.log("JS: validateYearInput 验证通过。");
        return false;
    } else {
        console.log("JS: validateYearInput 验证失败。");
        return "请输入四位数字的学年！";
    }
}

async function promptUserToStart() {
    console.log("JS: 流程开始：显示公告。");
    return await window.AndroidBridgePromise.showAlert(
        "教务系统课表导入",
        "导入前请确保您已在浏览器中成功登录教务系统",
        "好的，开始导入"
    );
}

async function getAcademicYear() {
    const currentYear = new Date().getFullYear().toString();
    console.log("JS: 提示用户输入学年。");
    return await window.AndroidBridgePromise.showPrompt(
        "选择学年",
        "请输入要导入课程的起始学年（例如 2025-2026 应输入2025）:",
        currentYear,
        "validateYearInput"
    );
}

async function selectSemester() {
    const semesters = ["第一学期", "第二学期"];
    console.log("JS: 提示用户选择学期。");
    const semesterIndex = await window.AndroidBridgePromise.showSingleSelection(
        "选择学期",
        JSON.stringify(semesters),
        -1
    );
    return semesterIndex;
}

/**
 * 将选择索引转换为 API 所需的学期码。
 */
function getSemesterCode(semesterIndex) {
    // semesterIndex 3 (第一学期), 12 (第二学期)
    return semesterIndex === 0 ? "3" : "12";
}


/**
 * 请求和解析课程数据
 */
async function fetchAndParseCourses(academicYear, semesterIndex) {
    const semesterCode = getSemesterCode(semesterIndex);
    const requestBody = `xnm=${academicYear}&xqm=${semesterCode}&kzlx=ck&xsdm=&kclbdm=`;
    const targetUrl = "http://jwxt.qqhrit.com:20266/jwglxt/kbcx/xskbcx_cxXsgrkb.html?gnmkdm=N2151";

    try {
        const response = await fetch(targetUrl, {
            method: "POST",
            headers: { 
                "Content-Type": "application/x-www-form-urlencoded;charset=UTF-8" 
            },
            body: requestBody,
            credentials: "include"
        });

        if (response.ok) {
            const jsonText = await response.text();
            const jsonData = JSON.parse(jsonText);
            if (jsonData && jsonData.kbList) {
                const parsedCourses = parseJsonData(jsonData);
                if (parsedCourses.length > 0) {
                    return {
                        courses: parsedCourses,
                        config: {
                            semesterStartDate: null,
                            semesterTotalWeeks: 20
                        }
                    };
                }
            }
        }
    } catch (e) {
        console.error(`Request failed: ${targetUrl}`, e);
    }

    AndroidBridge.showToast("未能获取课表数据，请检查网络环境或登录状态。");
    return null;
}

async function saveCourses(parsedCourses) {
    AndroidBridge.showToast(`正在保存 ${parsedCourses.length} 门课程...`);
    console.log(`JS: 尝试保存 ${parsedCourses.length} 门课程...`);
    try {
        await window.AndroidBridgePromise.saveImportedCourses(JSON.stringify(parsedCourses, null, 2));
        console.log("JS: 课程保存成功！");
        return true;
    } catch (error) {
        AndroidBridge.showToast(`课程保存失败: ${error.message}`);
        console.error('JS: Save Courses Error:', error);
        return false;
    }
}

// 统一作息时间 
// 3,4节作息采用1#、5#版本
const TimeSlots = [
    { number: 1, startTime: "08:00", endTime: "08:45" },
    { number: 2, startTime: "08:55", endTime: "09:40" },
    { number: 3, startTime: "10:05", endTime: "10:50" },
    { number: 4, startTime: "11:00", endTime: "11:45" },
    { number: 5, startTime: "13:30", endTime: "14:15" },
    { number: 6, startTime: "14:25", endTime: "15:10" },
    { number: 7, startTime: "15:20", endTime: "16:05" },
    { number: 8, startTime: "16:05", endTime: "16:50" },
    { number: 9, startTime: "18:00", "endTime": "18:45" },
    { number: 10, startTime: "18:45", "endTime": "19:30" },
    { number: 11, startTime: "19:30", "endTime": "20:15" }
];

async function importPresetTimeSlots(timeSlots) {
    console.log(`JS: 准备导入 ${timeSlots.length} 个预设时间段。`);

    if (timeSlots.length > 0) {
        AndroidBridge.showToast(`正在导入 ${timeSlots.length} 个预设时间段...`);
        try {
            await window.AndroidBridgePromise.savePresetTimeSlots(JSON.stringify(timeSlots));
            AndroidBridge.showToast("预设时间段导入成功！");
            console.log("JS: 预设时间段导入成功。");
        } catch (error) {
            AndroidBridge.showToast("导入时间段失败: " + error.message);
            console.error('JS: Save Time Slots Error:', error);
        }
    } else {
        AndroidBridge.showToast("警告：时间段为空，未导入时间段信息。");
        console.warn("JS: 警告：传入时间段为空，未导入时间段信息。");
    }
}


async function runImportFlow() {

    const alertConfirmed = await promptUserToStart();
    if (!alertConfirmed) {
        AndroidBridge.showToast("用户取消了导入。");
        console.log("JS: 用户取消了导入流程。");
        return;
    }

    const academicYear = await getAcademicYear();
    if (academicYear === null) {
        AndroidBridge.showToast("导入已取消。");
        console.log("JS: 获取学年失败/取消，流程终止。");
        return;
    }
    console.log(`JS: 已选择学年: ${academicYear}`);


    const semesterIndex = await selectSemester();
    if (semesterIndex === null || semesterIndex === -1) {
        AndroidBridge.showToast("导入已取消。");
        console.log("JS: 选择学期失败/取消，流程终止。");
        return;
    }
    console.log(`JS: 已选择学期索引: ${semesterIndex}`);

    const result = await fetchAndParseCourses(academicYear, semesterIndex);
    if (result === null) {
        console.log("JS: 课程获取或解析失败，流程终止。");
        return;
    }
    const { courses, config } = result;

    const saveResult = await saveCourses(courses);
    if (!saveResult) {
        console.log("JS: 课程保存失败，流程终止。");
        return;
    }
    
    try {
        await window.AndroidBridgePromise.saveCourseConfig(JSON.stringify(config));
        AndroidBridge.showToast(`课表配置更新成功！总周数：${config.semesterTotalWeeks}周。`);
    } catch (error) {
        AndroidBridge.showToast(`课表配置保存失败: ${error.message}`);
        console.error('JS: Save Config Error:', error);
    }


    await importPresetTimeSlots(TimeSlots);


    AndroidBridge.showToast(`课程导入成功，共导入 ${courses.length} 门课程！`);
    console.log("JS: 整个导入流程执行完毕并成功。");
    AndroidBridge.notifyTaskCompletion();
}

runImportFlow();