index.ts

#!/usr/bin/env node

import inquirer from "inquirer"; //initialize inquirer module 
import chalk from "chalk"; 

let Todos: string[] = [];
let condition = true; //for while loop

console.log(chalk.bgGray("\n\t Welcome to To-Do List Application\n\t")); //welcome message

// while (condition) {
//   let addTask = await inquirer.prompt([
//     {
//       name: "todo",
//       type: "input",
//       message: chalk.red("what you want to add in todo list?"), 
//     },
//   ]);

//   Todos.push(addTask.todo); 
//   console.log(chalk.green(`your list is ${addTask.todo}`)); 

//   let addMoreTask = await inquirer.prompt([
//     {
//       name: "addMore",
//       type: "confirm",
//       message: chalk.blue("Do you want to add more task?"),
//       default: "false",
//     },
//   ]);
//   condition = addMoreTask.addMore;
// }
// console.log(chalk.green("your updated list is", Todos));



// function to select option
let main = async () => {
  while (condition) {

    let optionAnswer = await inquirer.prompt([
      {
        name: "option",
        type: "list",
        message: chalk.blue("What you want to do?"),
        choices: [ "Add task","Remove task","Update task","View task","Exit"],
      },
    ]);

    if (optionAnswer.option === "Add task") {
      await addTask();
    
    }else if (optionAnswer.option === "Remove task") {
      await removeTask();

    }else if (optionAnswer.option === "Update task") {
      await updatedTask();

    }else if (optionAnswer.option === "View task") {
      await viewTask();

    }else if (optionAnswer.option === "Exit") {
      condition = false;
    }
  }
};

// function to add task
let addTask = async () => {
  let newTask = await inquirer.prompt([
    {
      name: "task",
      type: "input",
      message: chalk.red("Add a new task"),
    },
  ]);

  Todos.push(newTask.task);
  console.log(chalk.green(`\n your new task is ${newTask.task}\n`));
};

// function to view all task in todo list
let viewTask = async () => {
  console.log("\n your todos list:\n");
  Todos.forEach((task, index) => {
    console.log(`${index} ${task}`);  //if you want indexing no start from 1 then console log(`${index + 1} ${task}`) for 1 based indexing and also changes in removeTask and updatedTask.

});
 console.log("\n"); //must be after brackets otherwise more gap between two lines.
};
//function to remove task
let removeTask = async () => {
    await viewTask();
  let removeTask = await inquirer.prompt([
    {
      name: "index",
      type: "number",
      message: chalk.red("Enter the index number of task you want to remove"),
    },
  ]);
  let removeTaskIndex = Todos.splice(removeTask.index, 1); //Todos.splice(removeTask.index - 1, 1)
  console.log(chalk.green(`\n your task at index no ${removeTask.index} is removed from list\n`));
};

// function to update task
let updatedTask = async () => {
  await viewTask();

  let updatedTask = await inquirer.prompt([
    {
      name: "index",
      type: "number",
      message: chalk.red("Enter the index number of task you want to update"),
    },
    {
      name: "new task",
      type: "input",
      message: chalk.red("Now Enter the new task"),
    },
  ]);
  Todos[updatedTask.index ] = updatedTask.newtask; //Todos[updatedTask.index -1] = updatedTask.newtask
  
  console.log(chalk.green(`\n your task at index no ${updatedTask.index} is updated to ${updatedTask.task} successfully \n`));
  //console.log(chalk.green(`\n your task at index no ${updatedTask.index -1} is updated to ${updatedTask.task} successfully \n`))

};
main();