Merge pull request mouredev#4497 from hozlucas28/Solution-25-Go

#25 - Go

Author: Roswell468

Roadmap/25 - LOGS/go/hozlucas28.go

@@ -0,0 +1,187 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"time"
+)
+
+/* -------------------------------------------------------------------------- */
+/*                                   CLASSES                                  */
+/* -------------------------------------------------------------------------- */
+
+/* ------------------------------ Task Manager ------------------------------ */
+
+type Task struct {
+	description string
+	title       string
+}
+
+type TaskManager struct {
+	tasks           []Task
+	shouldPrintLogs bool
+}
+
+func (taskManager *TaskManager) addTask(newTask Task) error {
+	var startTime time.Time = time.Now()
+
+	if taskManager.shouldPrintLogs {
+		fmt.Println()
+		log.Println("addTask (method) start execution...")
+	}
+
+	taskManager.tasks = append(taskManager.tasks, newTask)
+
+	if taskManager.shouldPrintLogs {
+		log.Println("addTask (method) ends execution!")
+		log.Printf("addTask: %v\n", time.Since(startTime))
+	}
+
+	return nil
+}
+
+func (taskManager *TaskManager) deleteTaskByTitle(title string) error {
+	var startTime time.Time = time.Now()
+
+	if taskManager.shouldPrintLogs {
+		fmt.Println()
+		log.Println("deleteTaskByTitle (method) start execution...")
+	}
+
+	var uppercasedTitle string = strings.ToUpper(title)
+
+	var sanitizedTasks []Task
+
+	for _, task := range taskManager.tasks {
+		var uppercasedTaskTitle string = strings.ToUpper(task.title)
+
+		if uppercasedTaskTitle != uppercasedTitle {
+			sanitizedTasks = append(sanitizedTasks, task)
+
+		}
+	}
+
+	if len(taskManager.tasks) == len(sanitizedTasks) {
+		return errors.New("The task title was not found!")
+	}
+
+	taskManager.tasks = sanitizedTasks
+
+	if taskManager.shouldPrintLogs {
+		log.Printf("deleteTaskByTitle (method) ends execution!\n")
+		log.Printf("deleteTaskByTitle: %v\n", time.Since(startTime))
+	}
+
+	return nil
+}
+
+func (taskManager *TaskManager) printTasks() {
+	var startTime time.Time = time.Now()
+
+	if taskManager.shouldPrintLogs {
+		log.Printf("printTasks (method) start execution...\n\n")
+	}
+
+	for _, task := range taskManager.tasks {
+		fmt.Printf("%+v\n", task)
+	}
+
+	if taskManager.shouldPrintLogs {
+		fmt.Println()
+		log.Printf("printTasks (method) ends execution!\n")
+		log.Printf("printTasks: %v", time.Since(startTime))
+	}
+}
+
+/* -------------------------------------------------------------------------- */
+/*                                    MAIN                                    */
+/* -------------------------------------------------------------------------- */
+
+func main() {
+	/*
+		Logging...
+	*/
+
+	fmt.Println("Logging...")
+
+	fmt.Printf("\nlog.Print(<MESSAGE>)...\n\n")
+
+	log.Print("logger message!")
+
+	fmt.Printf("\nlog.Printf(<MESSAGE>)...\n\n")
+
+	log.Printf("Formatted logger message!")
+
+	fmt.Printf("\nlog.Println(<MESSAGE>)...\n\n")
+
+	log.Println("Logger message with line break at the end!")
+
+	fmt.Println("\n# ---------------------------------------------------------------------------------- #")
+
+	/*
+		Additional challenge...
+	*/
+
+	fmt.Printf("\nAdditional challenge...\n")
+
+	var taskManager TaskManager = TaskManager{shouldPrintLogs: true}
+
+	var exit bool = false
+	var reader *bufio.Reader = bufio.NewReader(os.Stdin)
+
+	for !exit {
+		fmt.Print("\nWrite an operation ('Add task', 'Delete task by title', 'Print tasks', or 'Exit'): ")
+		operation, readerErr := reader.ReadString('\n')
+		if readerErr != nil {
+			continue
+		}
+
+		operation = strings.TrimSpace(operation)
+		operation = strings.ToUpper(operation)
+
+	operationActions:
+		switch operation {
+		case "ADD TASK":
+			fmt.Print("\nTask title: ")
+			taskTitle, readerErr := reader.ReadString('\n')
+			if readerErr != nil {
+				break operationActions
+			}
+
+			fmt.Print("Task description: ")
+			taskDescription, readerErr := reader.ReadString('\n')
+			if readerErr != nil {
+				break operationActions
+			}
+
+			taskManager.addTask(Task{
+				description: strings.TrimSpace(taskDescription),
+				title:       strings.TrimSpace(taskTitle),
+			})
+
+		case "DELETE TASK BY TITLE":
+			fmt.Print("\nTask title: ")
+			taskTitle, readerErr := reader.ReadString('\n')
+			if readerErr != nil {
+				break operationActions
+			}
+
+			taskManager.deleteTaskByTitle(taskTitle)
+
+		case "PRINT TASKS":
+			fmt.Println()
+			taskManager.printTasks()
+
+		case "EXIT":
+			exit = true
+			fmt.Print("\nApplication closed!")
+
+		default:
+			fmt.Print("\nInvalid operation! Try again...\n")
+		}
+	}
+}