function love.load()
    -- font sizes
    med_font = love.graphics.newFont(32)
    big_font = love.graphics.newFont(128)

    -- string value
    upgrade_per_click = 1
    price_upgrade1 = 30
    price_upgrade2 = 7
    price_upgrade3 = 50
    upgrade_per_second = 0
    counter = 5
    counter_2 = 1
    timer = 0
    timer_2 = 0
    X2_active = false
    timer_2_initiated = false
    button_text1 = "+" .. tostring(upgrade_per_click)
    button_text2 = "+1 extra clicks, price: " .. tostring(price_upgrade1)
    button_text3 = "+1 extra clicks per second, price: " .. tostring(price_upgrade2)
    button_text4 = "X2 clicks for 15 seconds, price: " .. tostring(price_upgrade3)

    -- title
    love.window.setTitle("The Best Game EVER!!!")

    -- number value
    number_value = 0

    -- button table
    button = {}
    button.width = 300
    button.height = 75
    button.x = 400 - button.width/2
    button.y = 300
    button.label = button_text1
    button.hovered = false

    -- button upgrade 1 table
    button_upgrade1 = {}
    button_upgrade1.width = 200
    button_upgrade1.height = 175
    button_upgrade1.x = 20
    button_upgrade1.y = 400
    button_upgrade1.label = button_text2
    button_upgrade1.hovered = false

    -- button upgrade 2 table
    button_upgrade2 = {}
    button_upgrade2.width = 200
    button_upgrade2.height = 175
    button_upgrade2.x = 400 - button_upgrade2.width/2
    button_upgrade2.y = 400
    button_upgrade2.label = button_text3
    button_upgrade2.hovered = false

    -- button upgrade 3 table
    button_upgrade3 = {}
    button_upgrade3.width = 200
    button_upgrade3.height = 175
    button_upgrade3.x = 580
    button_upgrade3.y = 400
    button_upgrade3.label = button_text4
    button_upgrade3.hovered = false


end

function love.update(dt)
    -- get mouse cords
    mouseX, mouseY = love.mouse.getPosition()
    timer = timer + 1

    -- for click per second
    if timer == 60 then
        timer = 0
        number_value = number_value + upgrade_per_second
    end

    -- X2 boost logic
    if timer_2_initiated and not x2_active then
        x2_active = true
        timer_2 = 0
        upgrade_per_click = upgrade_per_click * 2
        upgrade_per_second = upgrade_per_second * 2
        button.label = "+" .. tostring(upgrade_per_click)
    end

    if x2_active then
        timer_2 = timer_2 + dt
        if timer_2 >= 15 then
            -- restore
            x2_active = false
            timer_2_initiated = false
            upgrade_per_click = upgrade_per_click / 2
            upgrade_per_second = upgrade_per_second / 2
            button.label = "+" .. tostring(upgrade_per_click)
        end
    end
    -- check when mouse is hovered
    if (mouseX > button.x  and  mouseX < button.x + button.width and mouseY > button.y and mouseY < button.y + button.height) then
        button.hovered = true
    else
        button.hovered = false
    end

    if (mouseX > button_upgrade1.x  and  mouseX < button_upgrade1.x + button_upgrade1.width and mouseY > button_upgrade1.y and mouseY < button_upgrade1.y + button_upgrade1.height) then
        button_upgrade1.hovered = true
    else
        button_upgrade1.hovered = false
    end

    if (mouseX > button_upgrade2.x  and  mouseX < button_upgrade2.x + button_upgrade2.width and mouseY > button_upgrade2.y and mouseY < button_upgrade2.y + button_upgrade2.height) then
        button_upgrade2.hovered = true
    else
        button_upgrade2.hovered = false
    end

    if (mouseX > button_upgrade3.x  and  mouseX < button_upgrade3.x + button_upgrade3.width and mouseY > button_upgrade3.y and mouseY < button_upgrade3.y + button_upgrade3.height) then
        button_upgrade3.hovered = true
    else
        button_upgrade3.hovered = false
    end
    
end

function love.draw()

    -- background color
    love.graphics.setBackgroundColor(0, 0.2, 0.2)

    -- draw hover
    if button.hovered == true then
        -- draw highlited 1
        love.graphics.setColor(255, 255, 255, 0.60)
        love.graphics.rectangle("fill", button.x, button.y, button.width, button.height)
    else
        -- draw button
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button.x, button.y, button.width, button.height)
    end

    -- draw click
    if (button.hovered == true and love.mouse.isDown(1)) then
        love.graphics.setColor(255, 255, 255, 1)
        love.graphics.rectangle("fill", button.x, button.y, button.width, button.height)
    else
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button.x, button.y, button.width, button.height)
    end

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    -- draw hover
    if button_upgrade1.hovered == true then
        -- draw highlited 1
        love.graphics.setColor(255, 255, 255, 0.60)
        love.graphics.rectangle("fill", button_upgrade1.x, button_upgrade1.y, button_upgrade1.width, button_upgrade1.height)
    else
        -- draw button
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button_upgrade1.x, button_upgrade1.y, button_upgrade1.width, button_upgrade1.height)
    end

    -- draw click
    if (button_upgrade1.hovered == true and love.mouse.isDown(1)) then
        love.graphics.setColor(255, 255, 255, 1)
        love.graphics.rectangle("fill", button_upgrade1.x, button_upgrade1.y, button_upgrade1.width, button_upgrade1.height)
    else
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button_upgrade1.x, button_upgrade1.y, button_upgrade1.width, button_upgrade1.height)
    end




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-------------------------------------------------------------------------------------------------------------

    -- draw hover
    if button_upgrade3.hovered == true then
        -- draw highlited 1
        love.graphics.setColor(255, 255, 255, 0.60)
        love.graphics.rectangle("fill", button_upgrade3.x, button_upgrade3.y, button_upgrade3.width, button_upgrade3.height)
    else
        -- draw button
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button_upgrade3.x, button_upgrade3.y, button_upgrade3.width, button_upgrade3.height)
    end

    -- draw click
    if (button_upgrade3.hovered == true and love.mouse.isDown(1)) then
        love.graphics.setColor(255, 255, 255, 1)
        love.graphics.rectangle("fill", button_upgrade3.x, button_upgrade3.y, button_upgrade3.width, button_upgrade3.height)
    else
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button_upgrade3.x, button_upgrade3.y, button_upgrade3.width, button_upgrade3.height)
    end




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-------------------------------------------------------------------------------------------------------------






    -- draw hover
    if button_upgrade2.hovered == true then
        -- draw highlited 1
        love.graphics.setColor(255, 255, 255, 0.60)
        love.graphics.rectangle("fill", button_upgrade2.x, button_upgrade2.y, button_upgrade2.width, button_upgrade2.height)
    else
        -- draw button
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button_upgrade2.x, button_upgrade2.y, button_upgrade2.width, button_upgrade2.height)
    end

    -- draw click
    if (button_upgrade2.hovered == true and love.mouse.isDown(1)) then
        love.graphics.setColor(255, 255, 255, 1)
        love.graphics.rectangle("fill", button_upgrade2.x, button_upgrade2.y, button_upgrade2.width, button_upgrade2.height)
    else
        love.graphics.setColor(255, 255, 255, 0.40)
        love.graphics.rectangle("fill", button_upgrade2.x, button_upgrade2.y, button_upgrade2.width, button_upgrade2.height)
    end





    -- print button label
    love.graphics.setFont(med_font)
    love.graphics.setColor(0, 0, 0, 1)
    love.graphics.printf(button.label, button.x+100, button.y+20, button.width, "left")

    -- print button upgrade 1 label
    love.graphics.setFont(med_font)
    love.graphics.setColor(0, 0, 0, 1)
    love.graphics.printf(button_upgrade1.label, button_upgrade1.x+15, button_upgrade1.y+20, button_upgrade1.width, "left")

    -- print button upgrade 2 label
    love.graphics.setFont(med_font)
    love.graphics.setColor(0, 0, 0, 1)
    love.graphics.printf(button_text3, button_upgrade2.x+15, button_upgrade2.y+5, button_upgrade2.width, "left")

    -- print button upgrade 3 label
    love.graphics.setFont(med_font)
    love.graphics.setColor(0, 0, 0, 1)
    love.graphics.printf(button_text4, button_upgrade3.x+25, button_upgrade3.y+10, button_upgrade3.width-20, "left")

    -- print number value
    love.graphics.setFont(big_font)
    love.graphics.setColor(255, 255, 255, 1)
    love.graphics.printf(number_value, -100, 40, 1000, "center")

    -- print X2 time
    love.graphics.setFont(med_font)
    love.graphics.printf("2X time: " .. tostring(math.ceil(timer_2)) .. "s/15s", 0, 0, 1000, "left")

    -- print clicks per second
    love.graphics.setFont(med_font)
    love.graphics.printf("Clicks per second: " .. tostring(upgrade_per_second), 0, 35, 1000, "left")
end

-- button click function (all)
function love.mousepressed()
    if button.hovered == true then
        number_value = number_value + upgrade_per_click
    end

    if button_upgrade1.hovered == true then
        if timer_2_initiated == false then
            if number_value >= price_upgrade1 then
                -- remove number value
                number_value = number_value - price_upgrade1

                -- increase price
                price_upgrade1 = math.ceil(price_upgrade1 * 1.35)

                -- increase clicks per click
                upgrade_per_click = upgrade_per_click + 1

                button.label = "+" .. tostring(upgrade_per_click)
                button_upgrade1.label = "+1 extra clicks, price: " .. tostring(price_upgrade1)
            else
                love.window.showMessageBox("The Best Game EVER!!!", "Not enough clicks!", "info", "false")
            end
        else
            love.window.showMessageBox("The Best Game EVER!!!", "Purchases not available in X2 time!", "info", "false")
        end
    end

    if button_upgrade2.hovered == true then
        if timer_2_initiated == false then
            if number_value >= price_upgrade2 then

                -- remove number value
                number_value = number_value - price_upgrade2

                -- increase price
                price_upgrade2 = math.ceil(price_upgrade2 * 1.35)

            
                -- increase clicks per second
                upgrade_per_second = upgrade_per_second + 1

                -- update label
                button_text3 = "+1 extra clicks per second, price: " .. tostring(price_upgrade2)
            else
                love.window.showMessageBox("The Best Game EVER!!!", "Not enough clicks!", "info", "false")
            end
        else
            love.window.showMessageBox("The Best Game EVER!!!", "Purchases not available in X2 time!", "info", "false")
        end
    end

    if button_upgrade3.hovered == true then
        if timer_2_initiated == false then
            if number_value >= price_upgrade3 then
                number_value = number_value - price_upgrade3
                price_upgrade3 = math.ceil(price_upgrade3 * 1.5)
                timer_2_initiated = true

                -- update label
                button_text4 = "X2 clicks for 15 seconds, price: " .. tostring(price_upgrade3)
            else
                love.window.showMessageBox("The Best Game EVER!!!", "Not enough clicks!", "info", "false")
            end
        else
            love.window.showMessageBox("The Best Game EVER!!!", "Purchases not available in X2 time!", "info", "false")
        end
    end
end


----------------------------   IDEAS -----------------------------------

-- an upgrade that gives 2x clicks for 30 seconds