button

local API = {}
local button = {}

local component = require("component")
local gpu = component.gpu

function draw(x, y, width, height, colorB, colorF, text)
    local oldBackground = gpu.setBackground(colorB)
    local textLen = string.len(text)
    if(textLen > (width - 2)) then
        text = string.sub(text , 1, width)
    end
    gpu.fill(x, y, width, height, " ")
    local oldForeground = gpu.setForeground(colorF)
    gpu.set(x + math.floor(width / 2) - (textLen / 2), y + math.floor(height / 2), text)
    gpu.setBackground(oldBackground)
    gpu.setForeground(oldForeground)
end

function toggleColor(buttonName)
    local foreground
    local background
    if button[buttonName]["state"] then
        foreground = button[buttonName]["textC1"]
        background = button[buttonName]["color1"]
    else
        foreground = button[buttonName]["textC2"]
        background = button[buttonName]["color2"]
    end

    draw(button[buttonName]["x"], button[buttonName]["y"], button[buttonName]["width"], button[buttonName]["height"], background, foreground, buttonName)
end

function API.add(name, callback, x, y, width, height, color1, color2, textC1, textC2, toggle, state)
    button[name] = {}
    button[name]["callback"] = callback
    button[name]["x"] = x
    button[name]["y"] = y
    button[name]["width"] = width
    button[name]["height"] = height
    button[name]["color1"] = color1
    button[name]["color2"] = color2
    button[name]["textC1"] = textC1
    button[name]["textC2"] = textC2
    button[name]["active"] = state
    button[name]["toggle"] = toggle

    draw(x, y, width, height, color1, textC1, name);
end

function API.getButtonState(name)
    return button[name]["state"]
end

-- Check for any button presses
function API.touch(x, y)
    for name, data in pairs(button) do
        local btnX = button[name]["x"]
        local btnY = button[name]["y"]
        local btnWidth = button[name]["width"]
        local btnHeight = button[name]["height"]

        if x < btnX then goto continue end
        if y < btnY then goto continue end
        if x > (btnX + btnWidth) then goto continue end
        if y > (btnY + btnHeight) then goto continue end

        if button[name]["callback"](name) then
            if button[name]["toggle"] then
                toggleColor(name)
                button[name]["state"] = not button[name]["state"];
            end
        end
        break;
        ::continue::
    end
end

return API;