cli.ts

import { DAYS, Lesson } from "./parser.ts";
import { genCalendar } from "./mod.ts";

const lessons: { [title: string]: Lesson } = {};
let day = DAYS[0];

const help = `
new - Create a new lesson entry
show - Show the timetable
help - Show this message
day <num> - Set day of the week, 1 for monday (Default), and 7 for sunday
finish - Generate timetable.ics file and exit
delete <title> - Delete the lesson entry of specified title
`
  .split("\n")
  .filter((l) => l.includes(" - "))
  .map((l) =>
    l
      .split(" - ")
      .map((v, i) => {
        if (i === 0) return v.padEnd(16, " ");
        else return v;
      })
      .join("")
  )
  .join("\n");

const nextTime = (t: string) => {
  const time = t.split(":").map((v) => parseInt(v));
  const mapTime = (t: number[]) =>
    t.map((v) => v.toString().padStart(2, "0")).join(":");
  if (time[1] === 0) {
    return mapTime([time[0], time[1] + 30]);
  } else if (time[1] === 30) {
    return mapTime([time[0] + 1, 0]);
  } else {
    throw new Error("Invalid time");
  }
};

console.log("Welcome to the interactive CLI of e-bridge Timetable parser");
console.log("\n" + help + "\n");

while (true) {
  const command = prompt(">", "")?.trim();
  if (!command) continue;

  // Process command
  if (command === "new") {
    // Command: new
    console.log("Current day of week:", day);
    const startInput = prompt("This class starts from: (eg. 9:00 or 9)", "")!;
    const duration = prompt("This class lasts for: (hours)", "")!;

    const start = startInput.includes(":") ? startInput : `${startInput}:00`;

    const time = [start];

    let i = parseFloat(duration) * 2;
    while (--i) {
      time.push(nextTime(time[time.length - 1]));
    }

    const paste = [];

    console.log("You can paste the class info now.");

    while (paste.length < 4) {
      const input = prompt("", "")!.trim();
      if (!input) continue;
      else paste.push(input);
    }

    const lesson: Lesson = {
      teachers: paste[1],
      location: paste[2],
      weeks: paste[3],
      day,
      time,
    };

    lessons[paste[0]] = lesson;
  } else if (command === "show") {
    // Command: show
    console.table(lessons);
  } else if (command === "help") {
    // Command: help
    console.log(help);
  } else if (command.startsWith("day ") || command === "day") {
    // Command: day
    if (command === "day") {
      console.log('Invalid usage of "day"');
      continue;
    }

    const newDay = command.split(/\s+/);
    const newDayId = parseInt(newDay[1]);

    if (1 <= newDayId && newDayId <= 7) {
      day = DAYS[newDayId - 1];
      console.log("Current day of the week set to", day);
    } else {
      console.log("Invalid day number, must be between 1 to 7");
    }
  } else if (command === "finish") {
    // Command: finish
    const calendar = genCalendar(lessons);

    Deno.writeTextFileSync("./timetable.ics", calendar.toString());
  } else if (command.startsWith("delete ") || command === "delete") {
    // Command: delete
    if (command === "delete") {
      console.log('Invalid usage of "delete"');
      continue;
    }

    const title = command.slice(7).trim();
    if (lessons[title]) delete lessons[title];
    else console.log("Title not found");
  } else {
    console.log("Unknown command");
  }
}