feat: Relation between projects and employees

src/main/java/com/maradona/backend/controllers/api/ProjectController.java

@@ -14,6 +14,7 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+import com.maradona.backend.entities.Employee;
 import com.maradona.backend.entities.Project;
 import com.maradona.backend.services.actions.ProjectActions;
 import com.maradona.backend.services.details.ProjectDetails;
@@ -24,10 +25,12 @@ import com.maradona.backend.services.details.ProjectDetails;
  * List of endpoints:
  * - GET /api/project
  * - GET /api/project/all
- * - GET /api/project/from-user
+ * - GET /api/project/participant/all
  * - POST /api/project
  * - PUT /api/project
+ * - PUT /api/project/participant
  * - DELETE /api/project
+ * - DELETE /api/project/participant
  * 
  * @see com.maradona.backend.entities.Project
  * @see com.maradona.backend.services.actions.ProjectActions
@@ -77,6 +80,18 @@ public class ProjectController {
     return ResponseEntity.ok(projectDetails.getProjectsByEid(eid));
   }
 
+  /**
+   * Returns a list of employees that participate in a given project.
+   * 
+   * @param pid ID of the project
+   * @return list of employees
+   * @see com.maradona.backend.entities.Employee
+   */
+  @GetMapping("/participant/all")
+  public ResponseEntity<Iterable<Employee>> getParticipants(@RequestParam Long pid) {
+    return ResponseEntity.ok(projectDetails.getProjectEmployees(pid));
+  }
+
   /**
    * Adds a new project to the database.
    * 
@@ -103,6 +118,19 @@ public class ProjectController {
     return ResponseEntity.ok(updatedProject);
   }
 
+  /**
+   * Adds an employee to a project. The employee is identified by their ID.
+   * 
+   * @param pid The ID of the project
+   * @param eid The ID of the employee
+   * @return
+   */
+  @PutMapping("/participant")
+  public ResponseEntity<Void> addParticipant(@RequestParam Long pid, @RequestParam Long eid) {
+    projectActions.addEmployeeToProject(pid, eid);
+    return ResponseEntity.noContent().build();
+  }
+
   /**
    * Deletes a project from the database.
    * 
@@ -115,4 +143,18 @@ public class ProjectController {
     projectActions.deleteProject(pid);
     return ResponseEntity.noContent().build();
   }
+
+  /**
+   * Removes an employee from a project. The employee is identified by their ID.
+   * 
+   * @param pid The ID of the project
+   * @param eid The ID of the employee
+   * @return HTTP status indicating the outcome of the operation
+   * @see com.maradona.backend.entities.Project
+   */
+  @DeleteMapping("/participant")
+  public ResponseEntity<Void> removeParticipant(@RequestParam Long pid, @RequestParam Long eid) {
+    projectActions.removeEmployeeFromProject(pid, eid);
+    return ResponseEntity.noContent().build();
+  }
 }

src/main/java/com/maradona/backend/entities/Employee.java

@@ -24,7 +24,7 @@ public class Employee {
     private String lastName;
 
     @ManyToOne
-    @JoinColumn(name = "fid")
+    @JoinColumn(name = "form_of_address_fid")
     private FormOfAddress formOfAddress;
 
     private LocalTime dStart;
@@ -34,6 +34,10 @@ public class Employee {
     @JsonManagedReference
     private List<EmployeeSecondarySkill> secondarySkills;
 
+    @ManyToMany
+    @JoinTable(name = "employee_project", joinColumns = @JoinColumn(name = "employee_eid"), inverseJoinColumns = @JoinColumn(name = "project_pid"))
+    private List<Project> projects;
+
     public void setEid(Long eid) {
         this.eid = eid;
     }

src/main/java/com/maradona/backend/entities/FormOfAddress.java

@@ -1,5 +1,7 @@
 package com.maradona.backend.entities;
 
+import java.util.List;
+
 import jakarta.persistence.*;
 import lombok.Data;
 
@@ -14,6 +16,9 @@ public class FormOfAddress {
     @Column(nullable = false, length = 50)
     private String description;
 
+    @OneToMany(mappedBy = "formOfAddress")
+    private List<Employee> employees;
+
     public void setFid(Long fid) {
         this.fid = fid;
     }
@@ -29,4 +34,12 @@ public class FormOfAddress {
     public String getDescription() {
         return description;
     }
+
+    public void setEmployees(List<Employee> employees) {
+        this.employees = employees;
+    }
+
+    public List<Employee> getEmployees() {
+        return employees;
+    }
 }

src/main/java/com/maradona/backend/entities/Project.java

@@ -3,6 +3,7 @@ package com.maradona.backend.entities;
 import jakarta.persistence.*;
 import lombok.Data;
 import java.time.LocalDate;
+import java.util.List;
 
 @Entity
 @Data
@@ -15,6 +16,9 @@ public class Project {
     @Column(nullable = false, length = 255)
     private String name;
 
+    @ManyToMany(mappedBy = "projects")
+    private List<Employee> employees;
+
     private LocalDate startDate;
     private LocalDate endDate;
 
@@ -39,6 +43,14 @@ public class Project {
         return name;
     }
 
+    public void setEmployees(List<Employee> employees) {
+        this.employees = employees;
+    }
+
+    public Iterable<Employee> getEmployees() {
+        return employees;
+    }
+
     public void setStartDate(LocalDate startDate) {
         this.startDate = startDate;
     }

src/main/java/com/maradona/backend/services/actions/ProjectActions.java

@@ -1,9 +1,15 @@
 package com.maradona.backend.services.actions;
 
+import java.util.ArrayList;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+
+import com.maradona.backend.entities.Employee;
 import com.maradona.backend.entities.Project;
 import com.maradona.backend.repositories.ProjectRepository;
+import com.maradona.backend.services.details.EmployeeDetails;
+import com.maradona.backend.services.details.ProjectDetails;
 
 @Service
 public class ProjectActions {
@@ -11,6 +17,12 @@ public class ProjectActions {
   @Autowired
   private ProjectRepository projectRepository;
 
+  @Autowired
+  private ProjectDetails projectDetails;
+
+  @Autowired
+  private EmployeeDetails employeeDetails;
+
   public Project saveProject(Project project) {
     return projectRepository.save(project);
   }
@@ -23,4 +35,28 @@ public class ProjectActions {
       }
     }
   }
+
+  public void addEmployeeToProject(Long pid, Long eid) {
+    var project = projectDetails.getProjectByPid(pid).orElse(null);
+    var newEmployee = employeeDetails.getEmployeeByEid(eid).orElse(null);
+    var oldEmployees = project.getEmployees();
+    var employeeList = new ArrayList<Employee>();
+    for (Employee currentEmployee : oldEmployees) {
+      employeeList.add(currentEmployee);
+    }
+    employeeList.add(newEmployee);
+    project.setEmployees(employeeList);
+  }
+
+  public void removeEmployeeFromProject(Long pid, Long eid) {
+    var project = projectDetails.getProjectByPid(pid).orElse(null);
+    var oldEmployees = project.getEmployees();
+    var employeeList = new ArrayList<Employee>();
+    for (Employee currentEmployee : oldEmployees) {
+      if (!currentEmployee.getEid().equals(eid)) {
+        employeeList.add(currentEmployee);
+      }
+    }
+    project.setEmployees(employeeList);
+  }
 }

src/main/java/com/maradona/backend/services/details/ProjectDetails.java

@@ -2,9 +2,12 @@ package com.maradona.backend.services.details;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+
+import com.maradona.backend.entities.Employee;
 import com.maradona.backend.entities.Project;
 import com.maradona.backend.repositories.ProjectRepository;
 
+import java.util.ArrayList;
 import java.util.Optional;
 
 @Service
@@ -27,8 +30,23 @@ public class ProjectDetails {
     return projectRepository.findAll();
   }
 
+  public Iterable<Employee> getProjectEmployees(Long pid) {
+    var project = getProjectByPid(pid).orElse(null);
+    var employees = project.getEmployees();
+    return employees;
+  }
+
   public Iterable<Project> getProjectsByEid(Long eid) {
-    // TODO: Actually filter by user
-    return projectRepository.findAll();
+    var projects = projectRepository.findAll();
+    var employeeProjects = new ArrayList<Project>();
+    for (Project project : projects) {
+      var employees = project.getEmployees();
+      for (Employee employee : employees) {
+        if (employee.getEid().equals(eid)) {
+          employeeProjects.add(project);
+        }
+      }
+    }
+    return employeeProjects;
   }
 }