整個項目預期的任務量 （任務量 = 所有工作的預期時間10天）和 目前已經花的時間 （所有記錄的 ‘已經花費的時間’2天），還剩余的時間（所有工作的 ‘剩余時間’8天）

實現了課程管理功能的開發

package com.example.training.entity;

import javax.persistence.*;

@Entity
public class Course {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String name;
    private String teacher;

    @Column(columnDefinition = "TEXT")
    private String content;

    public Course() {
    }

    public Course(Integer id, String name, String teacher, String content) {
        this.id = id;
        this.name = name;
        this.teacher = teacher;
        this.content = content;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getTeacher() {
        return teacher;
    }

    public void setTeacher(String teacher) {
        this.teacher = teacher;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}
package com.example.training.entity;

import javax.persistence.*;
import java.time.LocalDateTime;
@Table(name = "employee_course")
@Entity
public class EmployeeCourse {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @ManyToOne
    @JoinColumn(name = "employee_id", nullable = false)
    private User employee;

    @ManyToOne
    @JoinColumn(name = "course_id", nullable = false)
    private Course course;

    private boolean active = true;
    private LocalDateTime selectedAt = LocalDateTime.now();

    // Getters and Setters
    public Integer getId() { return id; }
    public User getEmployee() { return employee; }
    public void setEmployee(User employee) { this.employee = employee; }
    public Course getCourse() { return course; }
    public void setCourse(Course course) { this.course = course; }
    public boolean isActive() { return active; }
    public void setActive(boolean active) { this.active = active; }
    public LocalDateTime getSelectedAt() { return selectedAt; }
    public void setSelectedAt(LocalDateTime selectedAt) { this.selectedAt = selectedAt; }
}


// 課程管理
    @GetMapping("/courses")
    public String courseManage(HttpSession session, Model model) {
        if (!checkAdmin(session)) return "redirect:/login";
        model.addAttribute("courses", adminService.findAllCourses());
        return "admin/course";
    }

    @PostMapping("/courses")
    public String saveCourse(@ModelAttribute Course course, HttpSession session) {
        if (!checkAdmin(session)) return "redirect:/login";
        adminService.saveCourse(course);
        return "redirect:/admin/courses";
    }

    // 課程刪除
    @PostMapping("/courses/delete/{id}")
    public String deleteCourse(@PathVariable Integer id,
                               HttpSession session,
                               RedirectAttributes ra) {
        if (!checkAdmin(session)) return "redirect:/login";

        try {
            adminService.deleteCourse(id);
            ra.addFlashAttribute("success", "課程刪除成功");
        } catch (AdminService.ServiceException e) {
            ra.addFlashAttribute("error", e.getMessage());
        } catch (Exception e) {
            ra.addFlashAttribute("error", "系統錯誤：" + e.getMessage());
        }
        return "redirect:/admin/courses";
    }


@GetMapping("/course")
    public String course(HttpSession session, Model model) {
        User employee = getCurrentEmployee(session);

        // 確保調用正確的服務方法
        List<Course> selectedCourses = employeeService.getSelectedCourses(employee.getId());
        List<Course> allCourses = employeeService.getAllCourses();
        List<ExamPaper> papers = employeeService.getAllPapers();

        // 正確設置模型屬性
        model.addAttribute("selectedCourses", selectedCourses);
        model.addAttribute("courses", allCourses);
        model.addAttribute("papers", papers);

        return "employee/course";
    }


    @PostMapping("/select-course")
    public String selectCourse(@RequestParam Integer courseId, HttpSession session) {
        User employee = getCurrentEmployee(session);
        employeeService.selectCourse(employee.getId(), courseId);
        return "redirect:/employee/course";
    }
// 課程管理增強
    @PostMapping("/cancel-course")
    public String cancelCourse(@RequestParam Integer courseId,
                               HttpSession session,
                               RedirectAttributes ra) {
        try {
            // 安全獲取當前用戶
            User employee = (User) session.getAttribute("user");
            if (employee == null || !employee.getRole().equals(User.Role.EMPLOYEE)) {
                ra.addFlashAttribute("error", "請先登錄員工賬號");
                return "redirect:/login";
            }

            employeeService.cancelCourse(employee.getId(), courseId);
            ra.addFlashAttribute("success", "課程退選成功");
        } catch (ServiceException e) {
            ra.addFlashAttribute("error", e.getMessage());
        } catch (Exception e) {
            ra.addFlashAttribute("error", "系統錯誤：" + e.getMessage());
        }
        return "redirect:/employee/course";
    }

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>課程管理</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        /* 基礎樣式 */
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            margin: 0;
            min-height: 100vh;
            padding: 2rem;
        }

        .container {
            background: rgba(255, 255, 255, 0.98);
            border-radius: 16px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
            padding: 2.5rem;
            max-width: 1000px;
            margin: 0 auto;
            backdrop-filter: blur(8px);
        }

        /* 提示信息 */
        .alert {
            padding: 1rem 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            font-weight: 500;
        }
        .alert.success {
            background: #e8f6ef;
            color: #2e7d32;
            border: 1px solid #a5d6a7;
        }
        .alert.error {
            background: #ffebee;
            color: #c62828;
            border: 1px solid #ffcdd2;
        }

        /* 返回鏈接 */
        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: #2a5298;
            padding: 0.8rem 1.2rem;
            border-radius: 6px;
            background: rgba(42,82,152,0.1);
            transition: all 0.2s ease;
            text-decoration: none;
            margin-bottom: 2rem;
        }
        .back-link:hover {
            background: rgba(42,82,152,0.2);
            transform: translateX(-3px);
        }

        /* 標題樣式 */
        h2 {
            color: #1e3c72;
            margin: 0 0 2rem;
            padding-bottom: 1rem;
            border-bottom: 3px solid #1e3c72;
            font-size: 2rem;
            letter-spacing: -0.5px;
        }

        /* 表單樣式 */
        form {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 12px;
            margin-bottom: 2.5rem;
        }
        input, textarea {
            width: 100%;
            padding: 12px;
            margin: 10px 0;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        input:focus, textarea:focus {
            border-color: #1e3c72;
            box-shadow: 0 0 0 3px rgba(30,60,114,0.1);
            outline: none;
        }
        button[type="submit"] {
            background: #1e3c72;
            color: white;
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.2s ease;
            margin-top: 1rem;
        }
        button[type="submit"]:hover {
            background: #2a5298;
            transform: translateY(-2px);
        }

        /* 表格樣式 */
        table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 6px rgba(0,0,0,0.05);
        }
        th {
            background: linear-gradient(135deg, #1e3c72, #2a5298);
            color: white;
            padding: 1rem;
            font-weight: 600;
        }
        td {
            padding: 1rem;
            border-bottom: 1px solid #f0f4f8;
        }
        tr:hover {
            background-color: #f8fafc;
        }

        /* 刪除按鈕 */
        .btn-delete {
            background: #c62828 !important;
            color: white !important;
            padding: 8px 16px;
            border-radius: 6px;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-delete:hover {
            background: #b71c1c !important;
            transform: translateY(-1px);
        }

        /* 響應式設計 */
        @media (max-width: 768px) {
            .container {
                padding: 1.5rem;
            }
            form {
                padding: 1.5rem;
            }
            table {
                display: block;
                overflow-x: auto;
            }
        }

        .alert-container {
            position: fixed;
            top: 80px;  /* 在導航欄下方 */
            right: 20px;
            z-index: 1000;
        }
    </style>
    <script>
        // 內容展開/收起功能
        function toggleContent(btn) {
            const wrapper = btn.closest('.content-wrapper');
            const preview = wrapper.querySelector('.content-preview');
            const isExpanded = preview.style.whiteSpace === 'normal';

            if(isExpanded) {
                preview.style.whiteSpace = 'nowrap';
                preview.style.overflow = 'hidden';
                preview.style.textOverflow = 'ellipsis';
                btn.textContent = '展開';
            } else {
                preview.style.whiteSpace = 'normal';
                preview.style.overflow = 'visible';
                preview.style.textOverflow = 'clip';
                btn.textContent = '收起';
            }
        }
    </script>

</head>
<body>
<div class="container">
    <div class="alert-container">
        <div th:if="${success}" class="alert success" th:text="${success}"></div>
        <div th:if="${error}" class="alert error" th:text="${error}"></div>
    </div>

    <h2>課程管理系統</h2>

    <h3>新增課程</h3>
    <form th:action="@{/admin/courses}" method="post">
        <input type="text" name="name" placeholder="課程名稱" required>
        <input type="text" name="teacher" placeholder="教師名稱" required>
        <textarea name="content" placeholder="課程內容" rows="4"></textarea>
        <button type="submit">添加課程</button>
    </form>

    <h3>課程列表</h3>
    <table>
        <thead>
        <tr>
            <th>課程名稱</th>
            <th>授課教師</th>
            <th class="content-col">課程內容</th>
            <th style="width:120px;">操作</th>
        </tr>
        </thead>
        <tbody>
        <tr th:each="course : ${courses}">
            <td th:text="${course.name}"></td>
            <td th:text="${course.teacher}"></td>
            <!-- 課程內容（帶展開/收起功能） -->
            <td class="content-cell">
                <div class="content-wrapper">
                    <div class="content-preview"
                         th:data-fulltext="${course.content}"
                         th:text="${#strings.abbreviate(course.content, 50)}"></div>
                    <button class="btn-expand" onclick="toggleContent(this)">?</button>
                </div>
            </td>
            <td>
                <form th:action="@{/admin/courses/delete/{id}(id=${course.id})}"
                      method="post"
                      onsubmit="return confirm('確定刪除該課程嗎？');">
                    <button type="submit" class="btn-delete">刪除</button>
                </form>
            </td>
        </tr>
        </tbody>
    </table>
</div>
</body>
</html>

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>課程中心</title>
    <style>
        :root {
            --primary-blue: #1e3c72;
            --secondary-blue: #2a5298;
            --success-green: #2e7d32;
            --error-red: #c62828;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            margin: 0;
            min-height: 100vh;
        }

        .admin-container {
            background: rgba(255, 255, 255, 0.98);
            border-radius: 16px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
            padding: 2.5rem;
            max-width: 1200px;
            margin: 2rem auto;
            backdrop-filter: blur(8px);
        }

        /* 主標題樣式（深藍色文字+淺灰下劃線） */
        .main-title {
            color: var(--primary-blue);
            margin: 0 0 2rem;
            padding-bottom: 1rem;
            border-bottom: 2px solid #e0e0e0;
            font-size: 1.8rem;
            letter-spacing: -0.5px;
        }

        /* 子標題樣式（左側藍線） */
        .section-title {
            color: var(--primary-blue);
            font-size: 1.5rem;
            padding-left: 1rem;
            margin: 2rem 0;
            border-left: 4px solid var(--primary-blue);
            line-height: 1.2;
        }

        .course-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 2rem;
        }

        /* 課程卡片樣式 */
        .course-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 4px 12px rgba(30,60,114,0.1);
            border: 1px solid #e0e0e0;
            transition: transform 0.3s ease;
        }

        .course-card:hover {
            transform: translateY(-5px);
        }

        /* 課程名稱樣式 */
        .course-name {
            color: var(--primary-blue);
            margin: 0 0 1rem;
            font-size: 1.3rem;
            font-weight: 600;
        }

        /* 教師信息樣式 */
        .course-teacher {
            color: #65768c;
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
        }

        /* 課程內容容器 */
        .course-content {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 1.2rem;
            margin: 1.5rem 0;
            border: 1px solid #e0e0e0;
            position: relative;
        }

        /* 內容預覽樣式 */
        .content-preview {
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            color: #4a5568;
            line-height: 1.6;
        }

        /* 展開按鈕 */
        .btn-expand {
            position: absolute;
            right: 10px;
            bottom: 5px;
            background: none;
            border: none;
            color: var(--primary-blue);
            cursor: pointer;
            font-size: 1.2rem;
        }

        /* 通用按鈕樣式 */
        .btn {
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        /* 主按鈕 */
        .btn-primary {
            background: var(--primary-blue);
            color: white;
            box-shadow: 0 4px 12px rgba(30,60,114,0.2);
        }

        .btn-primary:hover {
            background: var(--secondary-blue);
            transform: translateY(-2px);
        }

        /* 取消按鈕 */
        .btn-cancel {
            background: var(--error-red);
            color: white;
            box-shadow: 0 4px 12px rgba(198,40,40,0.2);
        }

        .btn-cancel:hover {
            background: #b71c1c;
            transform: translateY(-2px);
        }

        /* 響應式設計 */
        @media (max-width: 768px) {
            .admin-container {
                padding: 1.5rem;
                margin: 1rem;
            }
            .course-grid {
                grid-template-columns: 1fr;
            }
        }
    </style>
    <script>
        function toggleContent(btn) {
            const wrapper = btn.closest('.course-content');
            const preview = wrapper.querySelector('.content-preview');
            const isExpanded = preview.style.whiteSpace === 'normal';

            preview.style.whiteSpace = isExpanded ? 'nowrap' : 'normal';
            preview.style.overflow = isExpanded ? 'hidden' : 'visible';
            preview.style.textOverflow = isExpanded ? 'ellipsis' : 'clip';
            btn.textContent = isExpanded ? '?' : '△';
        }
    </script>
</head>
<body>
<div class="admin-container">
    <!-- 主標題（與截圖中的"考試成績查詢"樣式一致） -->
    <h1 class="main-title">課程管理系統</h1>

    <!-- 可選課程模塊 -->
    <div class="course-section">
        <h3 class="section-title">可選課程</h3>
        <div class="course-grid">
            <div class="course-card" th:each="course : ${courses}">
                <h4 class="course-name" th:text="${course.name}"></h4>
                <p class="course-teacher">授課教師：<span th:text="${course.teacher}"></span></p>

                <div class="course-content">
                    <div class="content-preview"
                         th:data-fulltext="${course.content}"
                         th:text="${#strings.abbreviate(course.content, 50)}"></div>
                    <button class="btn-expand" onclick="toggleContent(this)">?</button>
                </div>

                <form th:action="@{/employee/select-course}" method="post">
                    <input type="hidden" name="courseId" th:value="${course.id}">
                    <button type="submit" class="btn btn-primary">?? 立即選課</button>
                </form>
            </div>
        </div>
    </div>

    <!-- 已選課程模塊 -->
    <div class="course-section" th:if="${not #lists.isEmpty(selectedCourses)}">
        <h3 class="section-title">已選課程</h3>
        <div class="course-grid">
            <div class="course-card" th:each="course : ${selectedCourses}">
                <h4 class="course-name" th:text="${course.name}"></h4>
                <p class="course-teacher">授課教師：<span th:text="${course.teacher}"></span></p>

                <div class="course-content">
                    <div class="content-preview"
                         th:data-fulltext="${course.content}"
                         th:text="${#strings.abbreviate(course.content, 50)}"></div>
                    <button class="btn-expand" onclick="toggleContent(this)">?</button>
                </div>

                <form th:action="@{/employee/cancel-course}" method="post">
                    <input type="hidden" name="courseId" th:value="${course.id}">
                    <button type="submit" class="btn btn-cancel">?? 退選課程</button>
                </form>
            </div>
        </div>
    </div>
</div>
</body>
</html>