print("starting aspirin...")
--function variables
local drawRectFill = zmg.drawRectFill
local drawCircle = zmg.drawCircle
local fastCopy = zmg.fastCopy
local makeColor = zmg.makeColor
local drawPoint = zmg.drawPoint
local drawLine = zmg.drawLine
local clear = zmg.clear
local drawText = zmg.drawText
local keyDirectPoll = zmg.keyDirectPoll
local keyDirect = zmg.keyDirect
local floor = math.floor
local random = math.random

--variables
local key = {F1=79, F2=69, F3=59, F4=49, F5=39, F6=29, Alpha=77, Exit=47, Optn=68, Up=28, Down=37, Left=38, Right=27}
local color = {bg=makeColor("black"),fg=makeColor("blue"),fg2=makeColor("red"),line=makeColor("lightblue")}
--lines={{x1,y1,direction(-1,1),direction(0=horiz,1=vert)},{...}}
local lines={}
local player={x=384/2,y=216/2,size=5,speed=2}
local target={x=384/2,y=216/4,size=10}
local linewidth=20
local linespeed=2

local score=0

--screen vars
local SCREEN_WIDTH = 384
local SCREEN_HEIGHT = 216

--game loop
keyDirectPoll()
while exit~=1 do
    if keyDirect(key.Exit)>0 then
        exit=1
    end
    --clear screen
    drawRectFill(0,0,SCREEN_WIDTH,SCREEN_HEIGHT,color.bg)
    --display score
    drawText(1,1,"SCORE: " .. score,color.fg2,color.bg)
    --[[debug
    drawText(1,20,"DEBUG: " .. #lines,color.fg2,color.bg)
    --]]

    --keys
    if keyDirect(key.Left)>0 and player.x>0 then player.x=player.x-player.speed
        elseif keyDirect(key.Right)>0 and player.x<SCREEN_WIDTH then player.x=player.x+player.speed
    end
    if keyDirect(key.Up)>0 and player.y>0 then player.y=player.y-player.speed
        elseif keyDirect(key.Down)>0 and player.y<SCREEN_HEIGHT then player.y=player.y+player.speed
    end

    --calculations
    --check collision with target
    if player.x<target.x+target.size and player.x>target.x-target.size
        and player.y-player.size<target.y+target.size and player.y+player.size>target.y-target.size then
        target.x=random(0,SCREEN_WIDTH)
        target.y=random(0,SCREEN_HEIGHT)
        score=score+100
        -- create lines
        if player.y>SCREEN_HEIGHT/2 then
            lines[#lines+1]={random(0,SCREEN_WIDTH/2),random(0,SCREEN_HEIGHT/2-player.size),1,0}
            else
            lines[#lines+1]={random(0,SCREEN_WIDTH/2),random(SCREEN_HEIGHT/2+player.size,SCREEN_HEIGHT),1,0}
        end

        if player.x>SCREEN_WIDTH/2 then
            lines[#lines+2]={random(0,SCREEN_WIDTH/2-player.size),random(0,SCREEN_HEIGHT/2),1,1}
            else
            lines[#lines+2]={random(SCREEN_WIDTH/2+player.size,SCREEN_WIDTH),random(0,SCREEN_HEIGHT/2),1,1}
            fastCopy()
        end
    end

    --lines
    for i=1,#lines,1 do
        --if horizontal
        if lines[i][4]==0 then
            --reverse direction if hit edge
            if lines[i][1]>SCREEN_WIDTH-linewidth or lines[i][1]<0 then
                lines[i][3]=lines[i][3]*-1
            end
            --check collisions
            if lines[i][1]+linewidth>player.x-player.size and lines[i][1]<player.x+player.size
                and lines[i][2]>player.y-player.size and lines[i][2]<player.y+player.size then
                print("you lose")
                exit=1
            end
            --move it along
            lines[i][1]=lines[i][1]+linespeed*lines[i][3]
            --draw it
            drawLine(lines[i][1],lines[i][2],lines[i][1]+linewidth,lines[i][2],color.line)
        end

        --if vertical
        if lines[i][4]==1 then
            --reverse direction if hit edge
            if lines[i][2]>SCREEN_HEIGHT-linewidth or lines[i][2]<0 then
                lines[i][3]=lines[i][3]*-1
            end
            --check collisions
            if lines[i][2]+linewidth>player.y-player.size and lines[i][2]<player.y+player.size
                and lines[i][1]>player.x-player.size and lines[i][1]<player.x+player.size then
                print("you lose")
                exit=1
            end
            --move it along
            lines[i][2]=lines[i][2]+linespeed*lines[i][3]
            --draw it
            drawLine(lines[i][1],lines[i][2],lines[i][1],lines[i][2]+linewidth,color.line)
        end
    end

    keyDirectPoll()

    --display
    drawCircle(player.x,player.y,player.size,color.fg)
    drawCircle(target.x,target.y,target.size,color.fg2)
    fastCopy()

    keyDirectPoll()
end