// 湖北民族大学教务系统（jwgl.hbmzu.edu.cn/edu）拾光课表导入适配脚本
// 课表查询页（/edu/report/mySchedule.mvc）直接渲染课表 DOM：
//   #container 内每行 tr：首 td 为节次（"上午1-2节"…"晚上11-12节"），后续 7 个 td 对应周一~周日
//   每格 .course-block 含 span：课程名、教室、周次、教师（无教室时仅 3 个）
// 注意：无开学日期/总周数接口，config 仅保存作息时间

// 预设作息时间（12 节，含午间/晚间）
const HBMZU_TIME_SLOTS = [
    { 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: "14:00", endTime: "14:45" },
    { number: 6, startTime: "14:50", endTime: "15:35" },
    { number: 7, startTime: "16:05", endTime: "16:50" },
    { number: 8, startTime: "16:55", endTime: "17:40" },
    { number: 9, startTime: "18:30", endTime: "19:15" },
    { number: 10, startTime: "19:20", endTime: "20:05" },
    { number: 11, startTime: "20:15", endTime: "21:00" },
    { number: 12, startTime: "21:05", endTime: "21:50" }
];

function getErrorMessage(error) {
    if (error && typeof error.message === "string" && error.message.trim()) return error.message;
    if (typeof error === "string" && error.trim()) return error;
    try {
        const serialized = JSON.stringify(error);
        if (serialized && serialized !== "{}") return serialized;
    } catch (_) {
        // Ignore serialization failures.
    }
    return "未知错误";
}

// 收集可访问的 document（frameset 用 <frame>，普通页面用 <iframe>）
function collectDocs() {
    const docs = [document];
    const frames = document.querySelectorAll("iframe, frame");
    for (const f of frames) {
        try {
            if (f.contentDocument) docs.push(f.contentDocument);
        } catch (_) {
            // 跨域 frame 无法访问，忽略。
        }
    }
    return docs;
}

// 从各 frame 中查找课表表格（#container 内含 .course-block）
// 注入时机早于 frame 加载完成，故轮询等待 frame 就绪（最长 6 秒）
async function findCourseTable() {
    const deadline = Date.now() + 6000;
    while (Date.now() < deadline) {
        for (const doc of collectDocs()) {
            const container = doc.getElementById("container");
            if (container && container.querySelector(".course-block")) {
                return container;
            }
        }
        await new Promise(resolve => setTimeout(resolve, 300));
    }
    return null;
}

// 解析周次文本："3-14周"→3..14；"3-13单周"→3,5,7,9,11,13；"4-14双周"→4,6..14；"14-15周"→14,15
function parseWeeksText(weekStr) {
    const text = String(weekStr || "").replace(/\s+/g, "");
    const m = text.match(/^(\d+)-(\d+)(单|双)?周$/);
    if (!m) return [];
    const start = Number(m[1]);
    const end = Number(m[2]);
    const parity = m[3]; // "单" / "双" / undefined
    const weeks = [];
    for (let w = start; w <= end; w++) {
        if (parity === "单" && w % 2 === 0) continue;
        if (parity === "双" && w % 2 === 1) continue;
        weeks.push(w);
    }
    return weeks;
}

// 解析课表表格
// 每行首 td 为节次文本（"上午1-2节"→1-2），其后 7 个 td 依次为周一~周日
function parseCourseTable(container) {
    const courses = [];
    container.querySelectorAll("tr").forEach(row => {
        const tds = row.querySelectorAll("td");
        if (tds.length < 2) return;
        const sectionText = (tds[0].textContent || "").replace(/\s+/g, "");
        const sectionMatch = sectionText.match(/(\d+)-(\d+)节/);
        if (!sectionMatch) return;
        const startSection = Number(sectionMatch[1]);
        const endSection = Number(sectionMatch[2]);

        for (let i = 0; i < 7; i++) {
            const dayTd = tds[i + 1];
            if (!dayTd) continue;
            const blocks = dayTd.querySelectorAll(".course-block");
            for (const block of blocks) {
                const spans = block.querySelectorAll("span");
                if (spans.length < 3) continue;
                const name = (spans[0].textContent || "").trim();
                if (!name) continue;
                // span 结构：[名称, 教室?, 周次, 教师]；无教室时仅 [名称, 周次, 教师]
                const hasRoom = spans.length >= 4;
                const position = hasRoom ? (spans[1].textContent || "").trim() : "";
                const weekStr = (spans[hasRoom ? 2 : 1].textContent || "").trim();
                const teacher = (spans[spans.length - 1].textContent || "").trim();
                const weeks = parseWeeksText(weekStr);
                if (weeks.length === 0) continue;
                courses.push({
                    name,
                    teacher: teacher || "未知",
                    position: position || "待定",
                    day: i + 1,
                    startSection,
                    endSection,
                    weeks
                });
            }
        }
    });
    return courses;
}

// 合并同课程同时间同教室的条目（如单双周分教室的保持两条）
function mergeCourses(courses) {
    const merged = new Map();
    for (const c of courses) {
        const key = `${c.name}|${c.teacher}|${c.position}|${c.day}|${c.startSection}|${c.endSection}`;
        const holder = merged.get(key);
        if (holder) {
            holder.weeks = Array.from(new Set([...holder.weeks, ...c.weeks])).sort((a, b) => a - b);
        } else {
            merged.set(key, { ...c, weeks: [...c.weeks].sort((a, b) => a - b) });
        }
    }
    return Array.from(merged.values()).sort(
        (a, b) => a.day - b.day || a.startSection - b.startSection || a.name.localeCompare(b.name)
    );
}

// 保存作息时间
async function saveTimeSlots(timeSlots) {
    try {
        await window.shiguangBridgePromise.savePresetTimeSlots(JSON.stringify(timeSlots));
    } catch (error) {
        console.error("JS: 作息时间保存失败", error);
    }
}

async function runImportFlow() {
    const alertConfirmed = await window.shiguangBridgePromise.showAlert(
        "课表导入",
        "导入前请确保已登录并打开课表查询页面。",
        "好的，开始导入"
    );
    if (!alertConfirmed) {
        window.shiguangBridge.showToast("用户取消了导入。");
        return;
    }

    window.shiguangBridge.showToast("正在获取课表数据...");
    try {
        const container = await findCourseTable();
        if (!container) throw new Error("未找到课表，请确认已登录并打开课表查询页面。");

        const courses = parseCourseTable(container);
        if (courses.length === 0) throw new Error("课表中未解析到有效课程，请确认当前学期有课。");

        const merged = mergeCourses(courses);

        window.shiguangBridge.showToast(`正在保存 ${merged.length} 门课程...`);
        await window.shiguangBridgePromise.saveImportedCourses(JSON.stringify(merged, null, 2));
        await saveTimeSlots(HBMZU_TIME_SLOTS);

        window.shiguangBridge.showToast(`课程导入成功，共导入 ${merged.length} 门课程！`);
        window.shiguangBridge.notifyTaskCompletion();
    } catch (error) {
        window.shiguangBridge.showToast(`导入失败：${getErrorMessage(error)}`);
        console.error("JS: Import Error", error);
    }
}

runImportFlow();