--Vars
width, height = term.getSize()
i = 0
i_max = width*height
x = 1
y = 1
score = 0
tun_y = math.ceil(height/2)-4
tun_h = 7
s_time = 10
timer2 = 5+math.ceil(math.random(0,s_time))
dir = 0
timer3 = 400
lives = 3

--Highscore
if not fs.exists("tunnel_hs") then
        local tmp=io.open("tunnel_hs", "w")
        tmp:write("Name")
        tmp:write(1)
        tmp:close()
end

hs = io.open("tunnel_hs","r")
hs_name = hs:read("*l")
hs_score = hs:read("*l")
hs:close()

--Table
screen = {}
for a=1,width-1,1 do
        screen[a] = {}
end
for a=1,width-1,1 do
        for b=3,height-2,1 do
                screen[a][b] = " "
        end
end

--Functions
function drawPlayer()
        term.setCursorPos(2,y)
        write(">")
        if y == 3 then
                term.setCursorPos(2,y-1)
                write("-")
        end
        if y == height-2 then
                term.setCursorPos(2,y+1)
                write("-")
        end
end

function tunnel()
        for a=1,width-2,1 do
                for b=3,height-2,1 do
                        screen[a][b] = screen[a+1][b]
                        term.setCursorPos(a,B)
                        write(screen[a][b])
                end
        end
        for a=1,height-2,1 do
                screen[width-1][a] = "#"
                if a >= tun_y and a <= tun_y+tun_h then screen[width-1][a] = " " end
                term.setCursorPos(width-1,a)
                if screen[a][width-1] then write(screen[a][width-1]) end
        end
        if timer2 == 0 then
                dir = math.ceil(math.random(0,2))
                if dir == 1 then tun_y = tun_y + 1 end
                if dir == 2 then tun_y = tun_y - 1 end
                if tun_y == 2 then tun_y = 3 end
                if tun_y == height-1-tun_h then tun_y = height-2-tun_h end
                timer2 = 5+math.ceil(math.random(0,s_time))
        end
        timer2 = timer2 - 1
        if timer3 == 0 then
                tun_h = tun_h - 1
                timer3 = 160+tun_h*40
                if tun_h == 1 then
                        tun_h = 2
                        s_time = s_time-1
                        if s_time == 0 then s_time = 1 end
                end
        end
        timer3 = timer3 - 1
end

function gameover()
        lives = lives-1
        timer3 = 400
        tun_h = 7
        tun_y = math.ceil(height/2)-4
        y = math.ceil(height/2)
        s_time = 10
        if lives == -1 then
                term.clear()
                term.setCursorPos(math.ceil(width/2)-5,math.ceil(height/2)-4)
                write("Game Over!")
                term.setCursorPos(math.ceil(width/2)-10,math.ceil(height/2))
                write("Your score is: "..score)
                term.setCursorPos(math.ceil(width/2)-13,math.ceil(height/2)+2)
                if score > tonumber(hs_score) then
                        write("You have beaten \n                  "..hs_name.."'s highscore of "..hs_score.."!")
                        term.setCursorPos(math.ceil(width/2)-10,math.ceil(height/2)+5)
                        write("Please enter your name: ")
                        hs = io.open("tunnel_hs","w")
                        name = io.read()
                        hs:write(name.."\n")
                        hs:write(score.."\n")
                        hs:close()
                else
                        write("Too bad, you didn't beat \n                 "..hs_name.."'s highscore of "..hs_score..".")
                end
                term.setCursorPos(1,height)
                write("Press <Enter> to continue.")
                read()
                score = 0
        else
                term.setCursorPos(1,1)
                write("Score: 0         ")
                for a=1,width-1,1 do
                        for b=3,height-2,1 do
                                screen[a][b] = " "
                                term.setCursorPos(a,B)
                                write(screen[a][b])
                        end
                end
        end
end

function timerupdate()
        tunnel()
        timer1 = os.startTimer(.05)
end

--Intro
term.clear()
term.setCursorPos(1,1)
print("")
print("")
print("  X==---------------------------------==X")
print("  | CC Games: Tunnel, made by Chub1337! |")
print("  X==---------------------------------==X")
print("")
print("")
print("")
print("            Controls:")
print("")
print("            UP: ArrowKey-Up")
print("            DOWN: ArrowKey-Down")
print("")
print("            Current Highscore:")
print("            "..hs_name.." with "..hs_score)
print("")
print("")
write("Press <Enter> to continue.")
io.read()

term.clear()
term.setCursorPos(1,1)

--Screen
write("Score: "..score)

for i=1,width-1,1 do
        term.setCursorPos(i,2)
        write("-")
end
term.setCursorPos(1,height-1)
for i=1,width-1,1 do
        term.setCursorPos(i,height-1)
        write("-")
end

--Tunnel
x = 2
y = math.ceil(height/2)

timer1 = os.startTimer(.05)

while lives~=-1 do
        event, par = os.pullEvent()
        if event == "timer" and par == timer1 then timerupdate() end
        if event == "key" then
                if par == 200 then
                        y = y - 1
                        if y < 3 then
                                y = 3
                        end
                        term.setCursorPos(2,y+1)
                        write(" ")
                elseif par == 208 then
                        y = y + 1
                        if y > height-2 then
                                y = height-2
                                
                        end
                        term.setCursorPos(2,y-1)
                        write(" ")
                end
        end
        drawPlayer()
        score = score+1
        term.setCursorPos(1,1)
        write("Score: "..score)
        term.setCursorPos(math.ceil(width/2),1)
        write("Lives: "..lives)
        term.setCursorPos(1,height)
        --write("tun_h: "..tun_h.."   s_time: "..s_time.."   timer3: "..timer3.."  ")
        write("Highscore: "..hs_score.." by "..hs_name..".")
        if screen[2][y] == "#" then
                gameover()
        end
end