[Computer Craft]RPG

if not fs.exists("/res/bg") then
    shell.run("pastebin get zRp6Q7de res/bg")
end

bg = paintutils.loadImage("/res/bg")

inBattle = false
inItems = false

enemy = {
    lvl = 1,
    hp = 0,
    atk = 6
}

player = {
    x = 5,
    y = 5,
    xp = 0,
    next = 50,
    level = 1,
    hp = 100,
    maxhp=100,
    atk = 6,
    inventory = {
        [1]="----------",
        [2]="----------",
        [3]="----------",
        [4]="----------",
        [5]="----------",
        [6]="----------",
        [7]="----------",
        [8]="----------",
        [9]="----------",
        [10]="----------"
    }
}

function drawHud()
    term.setBackgroundColor(32768)
    term.setTextColor(1)
    term.setCursorPos(1,1)
    term.write("Lvl: "..player.level)
    term.write(" XP: "..player.xp.."/"..player.next)
    term.write(" Atk: "..player.atk)
    term.setCursorPos(1,2)
    term.write("HP: "..player.hp.."/"..player.maxhp)
end

function levelUp()
    if player.xp >= player.next then
        player.xp = player.xp - player.next
        player.level = player.level + 1
        player.next = math.ceil(player.next * 1.3)
        player.maxhp = player.maxhp + math.random(25,30)
        player.atk = player.atk + math.random(1,3)
        player.hp = player.maxhp
    end
end

while player.hp > 0 do
    sleep(0)
    term.clear()
    paintutils.drawImage(bg,1,1)
    drawHud()
    if inBattle == false then
        paintutils.drawPixel(player.x,player.y,128)

        local e, key = os.pullEvent("key")

        if key == keys.w then
            if player.y > 3 then
                player.y = player.y - 1
            end
        elseif key == keys.s then
            if player.y < 19 then
                player.y = player.y + 1
            end
        elseif key == keys.a then
            if player.x > 1 then
                player.x = player.x - 1
            end
        elseif key == keys.d then
            if player.x < 51 then
                player.x = player.x + 1
            end
        end
        if math.random(1,25) == 1 then
            inBattle = true
        end
    else
        if player.level > 1 then
            enemy.lvl = player.level -1
        else enemy.lvl = 1 end
        enemy.atk = enemy.lvl * 1.5
        enemy.hp = enemy.lvl * math.random(10,20)
        while enemy.hp > 0 and player.hp > 0 do
            term.clear()
            paintutils.drawImage(bg,1,1)
            drawHud()
            term.write("  Enemy HP: "..enemy.hp.."  Enemy Lvl: "..enemy.lvl)
            term.setCursorPos(1,3)
            term.setTextColor(32768)
            term.setBackgroundColor(256)
            if not inItems then
                print("[Attack]")
                print("[Item]  ")
                print("[Flee]  ")
            else
                term.setCursorPos(1,3)
                print("[Back]      ")
                for i=1,10 do
                    if player.inventory[i] ~= " " then
                        term.setCursorPos(1,i+3)
                        print(player.inventory[i])
                    end
                end
            end
            local e, b, x, y = os.pullEvent("mouse_click")
            if not inItems then
                if y == 3 and x < 9 then
                    enemy.hp = enemy.hp - math.random(0,player.atk)
                    player.hp = player.hp - math.random(0,enemy.atk)
                elseif y == 4 and x < 9 then
                    inItems = true
                elseif y == 5 and x < 9 then
                    if math.random(1,2) == 1 then
                        inBattle = false
                        break
                    else
                        player.hp = player.hp - math.random(0,enemy.atk)
                    end
                end
            else
                if y == 3 and x < 13 then
                    inItems = false
                else
                    for i=1,10 do
                        if y == i+3 and x < 13 then
                            elseif player.inventory[i] == "Potion I" then
                                player.inventory[i] = "----------"
                                player.hp = player.hp + math.floor((player.maxhp/4))
                                if player.hp > player.maxhp then
                                    player.hp = player.maxhp
                                end
                            elseif player.inventory[i] == "Potion II" then
                                player.inventory[i] = "----------"
                                player.hp = player.hp + math.floor((player.maxhp/2))
                                if player.hp > player.maxhp then
                                    player.hp = player.maxhp
                                end
                            elseif player.inventory[i] == "Potion III" then
                                player.inventory[i] = "----------"
                                player.hp = player.hp + math.floor((player.maxhp/4) * 3)
                                if player.hp > player.maxhp then
                                    player.hp = player.maxhp
                                end
                            elseif player.inventory[i] == "Potion IV" then
                                player.inventory[i] = "----------"
                                player.hp = player.maxhp
                                end
                            end
                        end
                    end
                end
            end
        end
        inBattle = false
        if player.hp < 1 then
            term.setBackgroundColor(32768)
            term.setTextColor(1)
            term.clear()
            term.setCursorPos(1,1)
            print("GAME OVER")
            sleep(1.5)
            os.reboot()
        else
            if math.random(1,10) == 1 then
                for i=1,10 do
                    if player.inventory[i] == "----------" then
                        item = math.random(1,4)
                        if item == 1 then
                            player.inventory[i] = "Potion I"
                        elseif item == 2 then
                            player.inventory[i] = "Potion II"
                        elseif item == 3 then
                            player.inventory[i] = "Potion III"
                        else
                            player.inventory[i] = "Potion IV"
                        end
                        break
                    end
                end
            end
            player.xp = player.xp + math.random(player.level * 2,player.level * 5)
            levelUp()
        end
    end
end