/classes/button

buttons = {}
Button={}
Button.__index=Button
defaultBackgroundColor=colors.black

function Button.new(params)
    assert(params.monitor, "Please set the monitor param (peripheral wrap of monitor)")
    assert(params.inactiveColor, "Please set inactiveColor param")
    assert(params.activeColor, "Please set activeColor param")
    assert(params.textColor, "Ple  ase set textColor param")
    assert(params.position.x, "Please set position.x param")
    assert(params.position.y, "Please set position.y param")
    assert(params.dimensions.height, "Please set dimensions.height param")
    assert(params.dimensions.width, "Please set dimensions.width param")
    assert(params.inactiveButtonText, "Please set the inactiveButtonText param")
    assert(params.activeButtonText, "Please set the activeButtonText param")
    assert(params.onClick, "Please set the onClick param (anonymous function)")

    local button={}
    setmetatable(button, Button)
    button.params=params

    if params.active then
        button.active=true
    else
        button.active=false
    end

    buttons[#buttons+1]=button

    return button
end

function Button:draw()
    local buttonColor=self.params.inactiveColor
    local buttonText=self.params.inactiveButtonText

    if self.active == true then
        buttonColor=self.params.activeColor
        buttonText=self.params.activeButtonText
    end

    self.params.monitor.setCursorPos(self.params.position.x, self.params.position.y)
    self.params.monitor.setBackgroundColor(buttonColor)

    for y=1,self.params.dimensions.height-1 do
        for x=1,self.params.dimensions.width-1 do
            self.params.monitor.setCursorPos(self.params.position.x+x, self.params.position.y+y)
            self.params.monitor.write(" ")
        end
    end

    local offset= {
        y=0
    }

    if self.params.dimensions.height%2==0 then
        offset.y=1
    end

    local textPositionY=math.floor(self.params.dimensions.height/2)-offset.y
    local textPositionX=math.floor((self.params.dimensions.width-string.len(buttonText))/2)

    self.params.monitor.setTextColor(self.params.textColor)
    self.params.monitor.setCursorPos(textPositionX+self.params.position.x, textPositionY+self.params.position.y)
    self.params.monitor.write(buttonText)

    self.params.monitor.setBackgroundColor(defaultBackgroundColor)
end

function Button:toggle()
    self.active=not self.active
    self:draw()
end

function Button:clicked(x, y)
    local inX = x >= self.params.position.x and x < (self.params.position.x+self.params.dimensions.width)
    local inY = y >= self.params.position.y and y < (self.params.position.y+self.params.dimensions.height)

    return inX and inY
end

function buttonClickHandler(spawned)
    local running=true
    while running do
        local event, side, x, y = os.pullEvent("monitor_touch")
        for index,button in ipairs(buttons) do
            if button:clicked(x, y) then
                local runOnClick=function()
                    button.params.onClick(button)
                end
                local spawnClickHandler=function()
                    buttonClickHandler(true)
                end
                parallel.waitForAny(runOnClick, spawnClickHandler)

                if spawned then
                    print("done with spawned click handler. returning to main...")
                    return
                end

                break
            end
        end
    end
end

function drawButtons()
    for index,button in ipairs(buttons) do
        button:draw()
    end
end