package hhn.temp.project.provider;

import hhn.temp.project.Task;
import hhn.temp.project.Worker;

import java.sql.SQLException;
import java.util.Collection;

/**
 * Simple Database Manager to handle simple command such as insertion, deletion, updating of Task and Worker objects.
 * @author Riley Schneider
 */
public interface DatabaseManager extends Database {
  /**
   * Saves a Task object into the database
   * @param task Task to be saved into the database
   * @throws SQLException Thrown if database error occurs
   */
  void saveTask(Task task) throws SQLException;

  /**
   * Saves a collection of Task objects into the database
   * @param tasks Tasks to be saved into the database
   * @throws SQLException Thrown if database error occurs
   */
  void saveTasks(Collection<Task> tasks) throws SQLException;

  /**
   * Saves a Worker object into the database
   * @param worker Worker to be saved into the database
   * @throws SQLException Thrown if database error occurs
   */
  void saveWorker(Worker worker) throws SQLException;

  /**
   * Saves a collection Worker objects into the database
   * @param workers Workers to be saved into the database
   * @throws SQLException Thrown if database error occurs
   */
  void saveWorkers(Collection<Worker> workers) throws SQLException;

  /**
   * Updates a Task object that already exists in the database
   * @param taskId The ID of the given task
   * @param newTaskObject The new Task object that will overwrite the existent task on database
   * @throws SQLException Thrown if database error occurs
   */
  void updateTask(int taskId, Task newTaskObject) throws  SQLException;

  /**
   * Updates a Worker object that already exists in the database
   * @param workerId The ID of the given worker
   * @param newWorkerObject The new Worker object that will overwrite the existent task on database
   * @throws SQLException Thrown if database error occurs
   */
  void updateWorker(int workerId, Worker newWorkerObject) throws  SQLException;

  /**
   * Deletes a task from the database
   * @param taskId The ID of the given task that needs to be deleted
   * @throws SQLException Thrown if database error occurs
   */
  void deleteTask(int taskId) throws  SQLException;

  /**
   * Deletes a worker from the database
   * @param workerId The ID of the given worker that needs to be deleted
   * @throws SQLException Thrown if database error occurs
   */
  void deleteWorker(int workerId) throws  SQLException;

  /**
   * Gets a collection of all tasks available in the database
   * @return A collection of tasks (empty if no task available)
   * @throws SQLException Thrown if database error occurs
   */
  Collection<Task> getTasks() throws SQLException;

  /**
   * Gets a collection of all workers available in the database
   * @return A collection of workers (empty if no task available)
   * @throws SQLException Thrown if database error occurs
   */
  Collection<Worker> getWorkers() throws SQLException;

  /**
   * Gets a task given by its ID from the database
   * @param taskId The task ID
   * @return A task from the database (NULL if no task found)
   * @throws SQLException Thrown if database error occurs
   */
  Task getTaskByTaskId(int taskId) throws SQLException;

  /**
   * Gets a worker given by its ID from the database
   * @param workerId The worker ID
   * @return A worker from the database (NULL if no worker found)
   * @throws SQLException Thrown if database error occurs
   */
  Worker getWorkerByWorkerId(int workerId) throws SQLException;

  /**
   * Gets the total number of available tasks in the database.
   * @return The total number of tasks (0 = zero entries; -1 = error)
   * @throws SQLException Thrown if database error occurs
   */
  int getTotalNumberOfTasks() throws  SQLException;

  /**
   * Gets the total number of available workers in the database.
   * @return The total number of workers (0 = zero entries; -1 = error)
   * @throws SQLException Thrown if database error occurs
   */
  int getTotalNumberOfWorkers() throws  SQLException;
}