-- @docclass
UIProgressBar = extends(UIWidget, 'UIProgressBar')

function UIProgressBar.create()
    local progressbar = UIProgressBar.internalCreate()
    progressbar:setFocusable(false)
    progressbar:setOn(true)
    progressbar.min = 0
    progressbar.max = 100
    progressbar.value = 0
    progressbar.bgBorderLeft = 0
    progressbar.bgBorderRight = 0
    progressbar.bgBorderTop = 0
    progressbar.bgBorderBottom = 0
    return progressbar
end

function UIProgressBar:setMinimum(minimum)
    self.minimum = minimum
    if self.value < minimum then
        self:setValue(minimum)
    end
end

function UIProgressBar:setMaximum(maximum)
    self.maximum = maximum
    if self.value > maximum then
        self:setValue(maximum)
    end
end

function UIProgressBar:setValue(value, minimum, maximum)
    if minimum then
        self:setMinimum(minimum)
    end

    if maximum then
        self:setMaximum(maximum)
    end

    self.value = math.max(math.min(value, self.maximum), self.minimum)
    self:updateBackground()
end

function UIProgressBar:setPercent(percent)
    self:setValue(percent, 0, 100)
end

function UIProgressBar:getPercent()
    return self.value
end

function UIProgressBar:getPercentPixels()
    return (self.maximum - self.minimum) / self:getWidth()
end

function UIProgressBar:getProgress()
    if self.minimum == self.maximum then
        return 1
    end
    return (self.value - self.minimum) / (self.maximum - self.minimum)
end

function UIProgressBar:updateBackground()
    if self:isOn() then
        local width = math.round(math.max((self:getProgress() *
                                              (self:getWidth() - self.bgBorderLeft - self.bgBorderRight)), 1))
        local height = self:getHeight() - self.bgBorderTop - self.bgBorderBottom
        local rect = {
            x = self.bgBorderLeft,
            y = self.bgBorderTop,
            width = width,
            height = height
        }
        self:setBackgroundRect(rect)
    end
end

function UIProgressBar:onSetup()
    self:updateBackground()
end

function UIProgressBar:onStyleApply(name, node)
    for name, value in pairs(node) do
        if name == 'background-border-left' then
            self.bgBorderLeft = tonumber(value)
        elseif name == 'background-border-right' then
            self.bgBorderRight = tonumber(value)
        elseif name == 'background-border-top' then
            self.bgBorderTop = tonumber(value)
        elseif name == 'background-border-bottom' then
            self.bgBorderBottom = tonumber(value)
        elseif name == 'background-border' then
            self.bgBorderLeft = tonumber(value)
            self.bgBorderRight = tonumber(value)
            self.bgBorderTop = tonumber(value)
            self.bgBorderBottom = tonumber(value)
        end
    end
end

function UIProgressBar:onGeometryChange(newRect, oldRect)
    if not self:isOn() then
        self:setHeight(0)
    end
    self:updateBackground()
end
