-- todo check player hitbox by setting breakpoint when he is hit by checking when he loses weapon
function findbit(p)
    return 2 ^ (p - 1)
end

function hasbit(x, p)
    return x % (p + p) >= p
end

local function test()
    local x = memory.readbyte(0x206)
    local y = memory.readbyte(0x210)
    local x2 = memory.readbyte(0x228)
    local y2 = memory.readbyte(0x22a)
    local x_offscreen = memory.readbyte(0x207)
    local y_offscreen = memory.readbyte(0x211)
    local x2_offscreen = memory.readbyte(0x229)
    local y2_offscreen = memory.readbyte(0x22b)

    -- Checks if the box went off screen and adjusts
    if x2_offscreen == 1 then
        x2 = 255 + x2
    elseif x2_offscreen == 255 then
        x2 = 0 -(255 - x2)
    end

    if y2_offscreen == 1 then
        y2 = 255 + y
    elseif y2_offscreen == 255 then
        y2 = 0 - (255 - y2)
    end

    if x_offscreen == 1 then
        x = 255 + x
    elseif x_offscreen == 255 then
        x = 0 -(255 - x)
    end

    if y_offscreen == 1 then
        y = 255 + y
    elseif y_offscreen == 255 then
        y = 0 - (255 - y)
    end

    gui.text(100,100,x .. "/" .. x2)
    gui.text(100,108,y .. "/" .. y2)
    gui.text(100,116,"offscreens x/y: " .. x2_offscreen .. "/" .. y2_offscreen)
    gui.box(x,y,x2,y2,"#0000FF35","#0000FFFF")
end

local function testobjects()
    local start = 0x240
    local base = 0
    local oend = 33
    local x
    local x_offscreen
    local y
    local y_offscreen
    local xrad
    local yrad
    local active
    local touch
    local projectile
    local hp

    for i = 0,oend,1 do
        base = start

        if i > 0 then
            base = start + (i * 0x40)
        end

        active = memory.readbyte(base + 0x16)
        hp = memory.readword(base + 6)
        if active > 0 then

            touch = hasbit(active,findbit(4))
            projectile = hasbit(active,findbit(5))

            x = memory.readbyte(base + 0xa)
            x2 = memory.readbyte
            x_offscreen = memory.readbyte(base + 0xb)
            y = memory.readbyte(base + 0xe)
            y_offscreen = memory.readbyte(base + 0xf)
            xrad = memory.readwordsigned(base+0x28)
            yrad = memory.readwordsigned(base+0x2A)
            x2  = x

            -- Checks if the box went off screen and adjusts
            if x_offscreen == 1 then
                x = 255 + x
            elseif x_offscreen == 255 then
                x = 0 -(255 - x)
            end

            if y_offscreen == 1 then
                y = 255 + y
            elseif y_offscreen == 255 then
                y = 0 - (255 - y)
            end

            if projectile and touch == true then
                 gui.box(x,y,x+ xrad,y+yrad,"#FF000035","#FF0000FF")
            elseif projectile == true then
                gui.box(x,y,x+ xrad,y+yrad,"#00FF0035","#00FF00FF")
            elseif touch == true then
                gui.box(x,y,x + xrad,y + yrad,"#FFFF0035","#FFFF00FF")
            end
            if hp > 0 then
                gui.text(x-5,y-5,"HP: " .. hp)
            end
        end
    end

end

while true do
    test()
    testobjects()
    emu.frameadvance()
end