todo

require 'colorize' # I can haz yellow?!

#def writeFile(list)
    #File.truncate(0)
    #File.open("todo.txt", "r+") do |file, list, index|
        #file.puts list[index]
    #end
#end

# Show to-do list
def showList(list)
    if list.length == 0
        puts "There's nothing on your to-do list."
    else
        list.each_with_index do |item, index|
            # + 1 so user doesn't see 0
            puts "#{index+1}. #{item}"
        end
    end
end

# Add to list
def addItem!(list, new)
    File.open($file, "a") do |file|
        list.push(new)
        file.puts list[(list.length - 1)]
        puts "\"#{list[(list.length - 1)]}\" added."
    end
end

# Remove from list
def removeItem!(list)
    if list.length == 0
        puts "There's nothing on your to-do list."
    else
        puts "Number to remove:"
        index = gets.chomp.to_i
            if index < 1 && index >= (list.length + 1)
            # remember that the index is - 1  what the user sees on the screen
                puts "Enter a valid number."
                removeItem!(list)
            else
                list.delete_at(index - 1)
                # We have to re-write the modified list now,
                # starting at the very begining of the file (indicated by '+'
                # as opposed to 'a'"
                File.truncate($file, 0)    # WARNING: Truncate isn't cross platform. It won't work on windows or mac.
                #File.open("todo.txt", "r+") do |file, list, index|
                    list.each_with_index do |list, index|
                        $file.puts list[index]
                    # Ruby is error:
# `block in removeItem!': undefined local variable or method `file' for main:Object (NameError)
                    end
                #end
            end
    end
end

# Edit list item
def editItem!(list)
    if list.length == 0
        puts "There's nothing on your to-do list."
    else
        puts "Number to edit:"
        index = gets.chomp.to_i
            if index < 1 && index >= (list.length + 1)
                puts "Enter a valid number."
                editItem!(list)
            else
                edited_item = gets.chomp
                list[index-1] = edited_item
                File.open($file, "r+") do |file|
                # re-write the modified list from the begining!
                    file.puts list
                end
            end
    end
end

# User interface
def menu(list)
    puts "\n(S)how list \t (A)dd item \t (R)emove item \t (E)dit item \t (Q)uit".green
    option = gets.chomp.downcase
    case option
        when  's'
            showList(list)
        when 'a'
            puts "What do you want to add?"
            text =  gets.chomp
            addItem!(list, text)
        when 'r'
            removeItem!(list)
        when 'e'
            editItem!(list)
        when 'q'
            exit
        else
            menu(list)
    end
menu(list)
end

# Let's go!
$file = "todo.txt"
File.open($file, "a+")
todo_list = IO.readlines($file)
menu(todo_list)