// 青岛黄海学院(qdhhc.edu.cn) 拾光课程表适配脚本
// 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

/**
 * 节次与周次合并去重函数
 * @param {Array<Object>} courses 原始解析课程数组
 * @returns {Array<Object>} 合并去重后的课程数组
 */
function mergeAndDistinctCourses(courses) {
    if (!Array.isArray(courses) || courses.length <= 1) return courses;

    // 1. 深拷贝并规范周次数据，过滤无效项
    const list = courses.map(c => ({
        ...c,
        name: c.name || '',
        teacher: c.teacher || '',
        position: c.position || '',
        weeks: Array.isArray(c.weeks) ? [...c.weeks].sort((a, b) => a - b) : []
    }));

    // 阶段 1：合并连续节次与完全重复记录（前提：名称、教师、地点、星期、周次一致）
    list.sort((a, b) => {
        return a.name.localeCompare(b.name) ||
               a.teacher.localeCompare(b.teacher) ||
               a.position.localeCompare(b.position) ||
               (a.day || 0) - (b.day || 0) ||
               a.weeks.join(',').localeCompare(b.weeks.join(',')) ||
               (a.startSection || 0) - (b.startSection || 0);
    });

    const step1Merged = [];
    let current = list[0];

    for (let i = 1; i < list.length; i++) {
        const next = list[i];

        const isSameCourseAndWeeks =
            current.name === next.name &&
            current.teacher === next.teacher &&
            current.position === next.position &&
            current.day === next.day &&
            current.weeks.join(',') === next.weeks.join(',');

        const isContinuous = current.endSection + 1 === next.startSection;
        const isDuplicate = current.startSection === next.startSection && current.endSection === next.endSection;

        if (isSameCourseAndWeeks && isContinuous) {
            // 节次连续：延长结束节次 (如 1-2 节 + 3-4 节 -> 1-4 节)
            current.endSection = next.endSection;
        } else if (isSameCourseAndWeeks && isDuplicate) {
            // 完全重复：跳过
            continue;
        } else {
            step1Merged.push(current);
            current = next;
        }
    }
    step1Merged.push(current);

    // 阶段 2：合并同节次的周次（前提：名称、教师、地点、星期、开始/结束节次一致）
    step1Merged.sort((a, b) => {
        return a.name.localeCompare(b.name) ||
               a.teacher.localeCompare(b.teacher) ||
               a.position.localeCompare(b.position) ||
               (a.day || 0) - (b.day || 0) ||
               (a.startSection || 0) - (b.startSection || 0) ||
               (a.endSection || 0) - (b.endSection || 0);
    });

    const step2Merged = [];
    let cur = step1Merged[0];

    for (let i = 1; i < step1Merged.length; i++) {
        const nxt = step1Merged[i];

        const isSameCourseAndSection =
            cur.name === nxt.name &&
            cur.teacher === nxt.teacher &&
            cur.position === nxt.position &&
            cur.day === nxt.day &&
            cur.startSection === nxt.startSection &&
            cur.endSection === nxt.endSection;

        if (isSameCourseAndSection) {
            // 周次合并去重 (如 1-8 周 + 9-16 周 -> 1-16 周)
            cur.weeks = Array.from(new Set([...cur.weeks, ...nxt.weeks])).sort((a, b) => a - b);
        } else {
            step2Merged.push(cur);
            cur = nxt;
        }
    }
    step2Merged.push(cur);

    return step2Merged;
}

/**
 * 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);
}

/**
 * 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 initialCourseList = [];

    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;
        }

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

    // 调用合并与去重函数，整理连续节次与单双周周次
    const finalCourseList = mergeAndDistinctCourses(initialCourseList);
    
    console.log(`JS: JSON 数据解析与合并完成，整理后共 ${finalCourseList.length} 门课程。`);
    return finalCourseList;
}

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.shiguangBridgePromise.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.shiguangBridgePromise.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.shiguangBridgePromise.showSingleSelection(
        "选择学期",
        JSON.stringify(semesters),
        0
    );
    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";
}

async function fetchSemesterStartDate(academicYear, semesterCode) {
    const url = "http://jwxt.qdhhc.edu.cn/jwglxt/kbcx/xskbcxZccx_cxZcByXnxq.html?gnmkdm=N2154";
    const requestBody = `xnm=${academicYear}&xqm=${semesterCode}`;

    try {
        const response = await fetch(url, {
            method: "POST",
            headers: { 
                "accept": "application/json, text/javascript, */*; q=0.01",
                "Content-Type": "application/x-www-form-urlencoded;charset=UTF-8",
                "x-requested-with": "XMLHttpRequest"
            },
            body: requestBody,
            credentials: "include"
        });

        if (response.ok) {
            const json = await response.json();
            if (Array.isArray(json) && json.length > 0) {
                const firstWeekObj = json.find(item => String(item.zs) === "1" || String(item.zsmc) === "1") || json[0];
                
                if (firstWeekObj.rq) {
                    const startDateStr = firstWeekObj.rq.split('/')[0];
                    if (/^\d{4}-\d{2}-\d{2}$/.test(startDateStr)) {
                        return startDateStr;
                    }
                }
                if (firstWeekObj.zcrq) {
                    const match = firstWeekObj.zcrq.match(/(\d{4}-\d{2}-\d{2})/);
                    if (match) return match[1];
                }
            }
        }
    } catch (e) {
        console.error("JS: 获取学期开学时间失败:", e);
    }
    return null;
}

async function fetchAndParseCourses(academicYear, semesterIndex) {
    const semesterCode = getSemesterCode(semesterIndex);
    const requestBody = `xnm=${academicYear}&xqm=${semesterCode}&kzlx=ck&xsdm=&kclbdm=`;
    
    const semesterStartDate = await fetchSemesterStartDate(academicYear, semesterCode);
    console.log("JS: 获取到的开学日期为:", semesterStartDate);

    const targetUrls = [
        "http://jwxt.qdhhc.edu.cn/jwglxt/kbcx/xskbcx_cxXsgrkb.html?gnmkdm=N2151"
    ];

    for (const url of targetUrls) {
        try {
            const response = await fetch(url, {
                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: semesterStartDate,
                                semesterTotalWeeks: 20
                            }
                        };
                    }
                }
            }
        } catch (e) {
            console.error(`JS: 接口请求失败: ${url}`, e);
        }
    }
    window.shiguangBridge.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) {
    window.shiguangBridge.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.shiguangBridgePromise.saveImportedCourses(JSON.stringify(parsedCourses, null, 2));
        console.log("JS: 课程保存成功！");
        return true;
    } catch (error) {
        window.shiguangBridge.showToast(`课程保存失败: ${error.message}`);
        console.error('JS: Save Courses Error:', error);
        return false;
    }
}

const TimeSlots = [
    { number: 1, startTime: "08:00", endTime: "08:45" },
    { number: 2, startTime: "08:50", endTime: "09:35" },
    { number: 3, startTime: "10:05", endTime: "10:50" },
    { number: 4, startTime: "10:55", endTime: "11:40" },
    { number: 5, startTime: "11:45", endTime: "12:30" },
    { number: 6, startTime: "14:00", endTime: "14:45" },
    { number: 7, startTime: "14:50", endTime: "15:35" },
    { number: 8, startTime: "16:05", endTime: "16:50" },
    { number: 9, startTime: "16:55", endTime: "17:40" },
    { number: 10, startTime: "19:10", endTime: "19:55" },
    { number: 11, startTime: "20:00", endTime: "20:45" }
];

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

    if (timeSlots.length > 0) {
        window.shiguangBridge.showToast(`正在导入 ${timeSlots.length} 个预设时间段...`);
        try {
            await window.shiguangBridgePromise.savePresetTimeSlots(JSON.stringify(timeSlots));
            window.shiguangBridge.showToast("预设时间段导入成功！");
            console.log("JS: 预设时间段导入成功。");
        } catch (error) {
            window.shiguangBridge.showToast("导入时间段失败: " + error.message);
            console.error('JS: Save Time Slots Error:', error);
        }
    } else {
        window.shiguangBridge.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) {
        window.shiguangBridge.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) {
        window.shiguangBridge.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) {
        window.shiguangBridge.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.shiguangBridgePromise.saveCourseConfig(JSON.stringify(config));
        let configMsg = `课表配置更新成功！`;
        if (config.semesterStartDate) {
            configMsg += `开学日期：${config.semesterStartDate}`;
        }
        window.shiguangBridge.showToast(configMsg);
    } catch (error) {
        window.shiguangBridge.showToast(`课表配置保存失败: ${error.message}`);
        console.error('JS: Save Config Error:', error);
    }


    await importPresetTimeSlots(TimeSlots);


    window.shiguangBridge.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。");
    window.shiguangBridge.notifyTaskCompletion();
}

runImportFlow();