# DSH's mini-assignment 2!
# Super awesome to-do list of doom

class ToDoList
    attr_accessor :todo

    @@filename = "save.todo"
    def filename
            @@filename
    end

    def initialize
        puts "Welcome to DSH's Ruby to-do list!"

        self.todo = []
        data = self.load
        if data != ""
            self.todo = Marshal.load(data) #Marshal is used to deserialize arrays
        end
    end

    def addTodo(newTodo)
        self.todo.push(newTodo)
    end

    def remove(index)
        self.todo.delete_at(index.to_i)
    end

    def edit(index, newText)
        self.todo[index] = newText
    end

    def printTodoList
        if self.todo.length == 0
            puts "\nYou have no items in your to-do list!"
        else
            print "\nYour current to-do list:\n"
            self.todo.each_with_index{|item, index| puts "#{index+1}: #{item}"}
        end
    end

    def load
        file = File.new(self.filename, "a+")
        data = ""
        while (line = file.gets)
            data += line
        end
        file.close
        return data
    end

    def save
        out_file = File.open(self.filename, "w") { |f| f.puts(Marshal.dump(self.todo)) } #Marshal is used to serialize arrays
    end
end

list = ToDoList.new
input = "0" #0 does nothing
while input != "4" #This part is the "flow" of the program. This is essentially the UI of the console
    if input == "0"
        #Do nothing, we just don't wanna fall into the else
    elsif input == "1" #Add item
        puts "\nAwesome! What do you want to add to your list?"
        newItem = gets.chomp
        list.addTodo(newItem)
    elsif input == "2" #Edit item
        if list.todo.length > 0 #This is kind of important here because the user will get stuck in a loop if there are no items
            puts "\nWhich item would you like to edit? (Enter the number to the left of the item!)"
            indexToEdit = gets.chomp.to_i
            while indexToEdit > list.todo.length
                list.printTodoList
                puts "\nThat is not a valid index! Please select an index to edit."
                indexToEdit = gets.chomp.to_i
            end
            puts "\nWhat would you like your item to say now?"
            newText = gets.chomp
            list.edit(indexToEdit-1, newText)
        else
            puts "You don't have any items to edit!"
        end
    elsif input == "3" #Remove
        if list.todo.length > 0 #This is kind of important here because the user will get stuck in a loop if there are no items
            puts "\nWhich item would you like to remove? (Enter the number to the left of the item)"
            indexToDelete = gets.chomp.to_i
            while indexToDelete > list.todo.length
                list.printTodoList
                puts "\nThat is not a valid index! Please select an index to remove."
                indexToDelete = gets.chomp.to_i
            end
            indexToDelete -= 1
            puts "\nAre you sure you want to remove '#{list.todo[indexToDelete]}'? (Yes or no)"
            confirmation = gets.chomp.downcase
            if confirmation.index("y") == 0
                list.remove(indexToDelete)
                puts "\nThe item was successfully removed!"
            else
                puts "\nAlright then, the item was not removed!"
            end
        else
            puts "You don't have any items to remove!"
        end
    else
        #We didn't hit any of the elses so the thing the user entered doesn't make sense, I guess.
        puts "\nUnknown command. Please select a number from 1 to 4 that corresponds with your desired action."
    end

    list.printTodoList
    puts "\nWhat do you want to do next?"
    puts "1: Add new item"
    puts "2: Edit item"
    puts "3: Remove item"
    puts "4: Save and quit"
    input = gets.chomp
end
list.save