feat: add course requirements

src/main/java/icu/sunway/ai_spring_example/Controllers/Course.java

@@ -0,0 +1,193 @@
+package icu.sunway.ai_spring_example.Controllers;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import icu.sunway.ai_spring_example.Common.ResponseEntity;
+
+/**
+ * 课程控制器
+ * 提供课程展示和报名相关的功能
+ */
+@RestController
+public class Course {
+
+    /**
+     * 获取课程列表
+     * 
+     * @param params 查询参数，包含page、size、name、category、status等字段
+     * @return 课程列表数据
+     */
+    @GetMapping("/courses")
+    public ResponseEntity<?> getCourseList(@RequestParam Map<String, Object> params) {
+        // 从Map中获取查询参数
+        Integer page = Integer.valueOf((String) params.getOrDefault("page", "1"));
+        Integer size = Integer.valueOf((String) params.getOrDefault("size", "10"));
+        String name = (String) params.get("name");
+        String category = (String) params.get("category");
+        Integer status = params.get("status") != null ? Integer.valueOf((String) params.get("status")) : null;
+
+        // TODO: 实现查询逻辑
+        // 1. 根据条件查询课程列表
+        // 2. 处理分页
+
+        // 模拟返回课程列表
+        List<Map<String, Object>> courseList = List.of(
+                Map.of("id", 1, "name", "Java基础课程", "category", "编程", "teacher", "张老师", "price", 99.00, "students", 150,
+                        "status", 1, "description", "Java入门到精通课程"),
+                Map.of("id", 2, "name", "Python数据分析", "category", "数据科学", "teacher", "李老师", "price", 199.00, "students",
+                        80, "status", 1, "description", "Python数据分析实战课程"));
+
+        Map<String, Object> responseData = new HashMap<>();
+        responseData.put("list", courseList);
+        responseData.put("total", 2);
+        responseData.put("page", page);
+        responseData.put("size", size);
+
+        return ResponseEntity.success("获取课程列表成功", responseData);
+    }
+
+    /**
+     * 获取课程详情
+     * 
+     * @param courseId 课程ID
+     * @return 课程详细信息
+     */
+    @GetMapping("/courses/{courseId}")
+    public ResponseEntity<?> getCourseDetail(@PathVariable Long courseId) {
+        // 参数验证
+        if (courseId == null) {
+            return ResponseEntity.error(400, "课程ID不能为空");
+        }
+
+        // TODO: 实现查询逻辑
+        // 1. 根据课程ID查询课程信息
+        // 2. 查询课程章节、评价等关联信息
+
+        // 模拟返回课程详情
+        Map<String, Object> courseInfo = Map.of(
+                "id", courseId, "name", "Java基础课程", "category", "编程", "teacher", "张老师", "price", 99.00,
+                "students", 150, "status", 1, "description", "Java入门到精通课程",
+                "chapters", List.of(
+                        Map.of("id", 1, "name", "Java简介", "duration", "30分钟"),
+                        Map.of("id", 2, "name", "变量与数据类型", "duration", "45分钟")),
+                "ratings", Map.of("avg", 4.8, "count", 50));
+
+        return ResponseEntity.success("获取课程详情成功", courseInfo);
+    }
+
+    /**
+     * 课程报名
+     * 
+     * @param enrollMap 报名信息，包含courseId、userId等字段
+     * @return 报名结果
+     */
+    @PostMapping("/courses/enroll")
+    public ResponseEntity<?> enrollCourse(@RequestBody Map<String, Object> enrollMap) {
+        // 从Map中获取报名信息
+        Long courseId = (Long) enrollMap.get("courseId");
+        Long userId = (Long) enrollMap.get("userId");
+
+        // 参数验证
+        if (courseId == null) {
+            return ResponseEntity.error(400, "课程ID不能为空");
+        }
+        if (userId == null) {
+            return ResponseEntity.error(400, "用户ID不能为空");
+        }
+
+        // TODO: 实现报名逻辑
+        // 1. 检查课程是否存在且可报名
+        // 2. 检查用户是否已报名该课程
+        // 3. 记录报名信息
+        // 4. 更新课程报名人数
+
+        // 模拟报名成功
+        Map<String, Object> responseData = new HashMap<>();
+        responseData.put("courseId", courseId);
+        responseData.put("userId", userId);
+        responseData.put("enrollTime", "2023-05-20 10:00:00");
+
+        return ResponseEntity.success("课程报名成功", responseData);
+    }
+
+    /**
+     * 获取用户报名的课程列表
+     * 
+     * @param params 查询参数，包含userId、page、size等字段
+     * @return 用户报名的课程列表
+     */
+    @GetMapping("/user/courses")
+    public ResponseEntity<?> getUserCourses(@RequestParam Map<String, Object> params) {
+        // 从Map中获取查询参数
+        Long userId = Long.valueOf((String) params.get("userId"));
+        Integer page = Integer.valueOf((String) params.getOrDefault("page", "1"));
+        Integer size = Integer.valueOf((String) params.getOrDefault("size", "10"));
+
+        // 参数验证
+        if (userId == null) {
+            return ResponseEntity.error(400, "用户ID不能为空");
+        }
+
+        // TODO: 实现查询逻辑
+        // 1. 根据用户ID查询已报名课程
+        // 2. 处理分页
+
+        // 模拟返回用户报名的课程列表
+        List<Map<String, Object>> userCourseList = List.of(
+                Map.of("id", 1, "courseId", 1, "courseName", "Java基础课程", "teacher", "张老师", "enrollTime",
+                        "2023-05-20 10:00:00", "status", "learning"),
+                Map.of("id", 2, "courseId", 2, "courseName", "Python数据分析", "teacher", "李老师", "enrollTime",
+                        "2023-05-15 14:30:00", "status", "completed"));
+
+        Map<String, Object> responseData = new HashMap<>();
+        responseData.put("list", userCourseList);
+        responseData.put("total", 2);
+        responseData.put("page", page);
+        responseData.put("size", size);
+
+        return ResponseEntity.success("获取用户课程列表成功", responseData);
+    }
+
+    /**
+     * 取消课程报名
+     * 
+     * @param courseId 课程ID
+     * @param params   参数，包含userId字段
+     * @return 取消报名结果
+     */
+    @DeleteMapping("/courses/{courseId}/enroll")
+    public ResponseEntity<?> cancelEnroll(@PathVariable Long courseId, @RequestParam Map<String, Object> params) {
+        // 从Map中获取用户ID
+        Long userId = Long.valueOf((String) params.get("userId"));
+
+        // 参数验证
+        if (courseId == null) {
+            return ResponseEntity.error(400, "课程ID不能为空");
+        }
+        if (userId == null) {
+            return ResponseEntity.error(400, "用户ID不能为空");
+        }
+
+        // TODO: 实现取消报名逻辑
+        // 1. 检查报名记录是否存在
+        // 2. 删除报名记录
+        // 3. 更新课程报名人数
+
+        // 模拟取消报名成功
+        Map<String, Object> responseData = new HashMap<>();
+        responseData.put("courseId", courseId);
+        responseData.put("userId", userId);
+
+        return ResponseEntity.success("取消课程报名成功", responseData);
+    }
+}