function colliding(a,b)
    if a.x<=0 or a.y<=0 or b.x<=0 or b.y<=0 then return false end
    return a.x < b.x + b.s and
    a.x + a.s > b.x and
    a.y < b.y + b.s and
    a.y + a.s > b.y
end

function setColor(r,b,g)
    love.graphics.setColor(r/255,b/255,g/255)
end


function love.load()
    font = love.graphics.newFont(12)

    plr = {
        x = 300;
        y = 300;
        s = 30;
        speed = 4;
        facing = "right";
    }

    object = {
        x = 400;
        y = 400;
        s = 100;
        health = 100;
        color = {0,255,0}
    }

    bullets = {}

    delay = 10;
end

function love.update(dt)
    if love.keyboard.isDown("w") then
        plr.facing = "up"
        plr.y = plr.y - plr.speed;
    end
    if love.keyboard.isDown("s") then
        plr.facing = "down"
        plr.y = plr.y + plr.speed;
    end
    if love.keyboard.isDown("a") then
        plr.facing = "left"
        plr.x = plr.x - plr.speed;
    end
    if love.keyboard.isDown("d") then
        plr.facing = "right"
        plr.x = plr.x + plr.speed;
    end

    if love.keyboard.isDown("space") then
        if delay == 10 then
            delay = 0;
            xx,yy = 0,0;
            if plr.facing == "right" then
                xx = plr.x+plr.s+10;
                yy = plr.y+plr.s/2
            elseif plr.facing == "left" then
                xx = plr.x-10;
                yy = plr.y+plr.s/2
            elseif plr.facing == "up" then
                xx = plr.x+plr.s/2;
                yy = plr.y-10;
            else
                xx = plr.x+plr.s/2;
                yy = plr.y+plr.s+10;
            end
            local bullet = {
                dir = plr.facing;
                x = xx;
                y = yy;
                s = 5;
                travelspeed = 10;
                damage = 5;
            }
            table.insert(bullets,bullet);
        else
            delay = delay + 1;
        end
    end

    for i=1,#bullets,1 do
        local bullet = bullets[i]
        if bullet ~= nil then
            if bullet.x<=0 then
                table.remove(bullets,i)
            elseif colliding(bullet,object) then
                table.remove(bullets,i)
                object.color = {love.math.random(0,255),love.math.random(0,255),love.math.random(0,255)}
                object.health = object.health - bullet.damage;
            else
                if bullet.dir == "right" then
                    bullet.x = bullet.x + bullet.travelspeed
                elseif bullet.dir == "left" then
                    bullet.x = bullet.x - bullet.travelspeed
                elseif bullet.dir == "up" then
                    bullet.y = bullet.y - bullet.travelspeed
                else
                    bullet.y = bullet.y + bullet.travelspeed
                end
            end
        end
    end
end

function drawBarrel()
    if plr.facing == "right" then
        love.graphics.rectangle("line",plr.x+plr.s, plr.y+plr.s/2-7/2, 10,7)
    elseif plr.facing == "left" then
        love.graphics.rectangle("line",plr.x-10, plr.y+plr.s/2-7/2, 10,7)
    elseif plr.facing == "up" then
        love.graphics.rectangle("line",plr.x+plr.s/2-7/2, plr.y-10, 7,10)
    else
        love.graphics.rectangle("line",plr.x+plr.s/2-7/2, plr.y+plr.s, 7,10)
    end
end

function love.draw()
    setColor(255,255,255)
    love.graphics.rectangle("line",plr.x, plr.y, plr.s, plr.s)
    drawBarrel()
    setColor(object.color[1],object.color[2],object.color[3])
    love.graphics.rectangle("line",object.x,object.y,object.s,object.s);
    setColor(255,255,255);
    local w = font:getWidth("health: "..object.health)
    love.graphics.print("health: "..object.health,object.x+object.s/2-w/2,object.y+object.s+5);

    for i=1,#bullets,1 do
        local bullet = bullets[i]
        setColor(255,0,0)
        love.graphics.circle("line",bullet.x,bullet.y,bullet.s,50);
    end
end