require("common.class")

---@class Page
---@field content Field[]
---@field viewHandler nil|PageView
local Page = {
    drawBackground = nil, ---@type nil|fun(deltaTime: number)
    drawHeader = nil, ---@type nil|fun(deltaTime: number)
    drawFooter = nil, ---@type nil|fun(deltaTime: number)
}

---Create a new Page instance
---@param o? table
---@return Page
function Page:new(o)
    o = Base(self, o)

    --set instance members

    o.content = o.content or {}
    o.viewHandler = o.viewHandler or nil

    return o
end

---Add field to page
---@param field Field
function Page:addField(field)
    field.parent = self
    table.insert(self.content, field)
end

---Refresh content values
function Page:refreshFields()
    for _, field in ipairs(self.content) do
        field.parent = self
    end
end

---Handle controller button input
---
---Overload this function to implement page-specific behaviour
---@param button integer
function Page:handleButtonInput(button)
    if button == game.BUTTON_BCK then
        if self.viewHandler then
            self.viewHandler:back()
        end
    end
end

---Handle controller knob input
---
---Overload this function to implement page-specific behaviour
---@param knob integer
---@param delta number
function Page:handleKnobInput(knob, delta) end

---Render page
---@param deltaTime number frametime in seconds
function Page:render(deltaTime)
    ---background
    if self.drawBackground then
        self:drawBackground(deltaTime)
    end

    --render children
    for _, child in ipairs(self.content) do
        child:render(deltaTime)
    end

    ---header
    if self.drawHeader then
        self:drawHeader(deltaTime)
    end

    ---footer
    if self.drawFooter then
        self:drawFooter(deltaTime)
    end
end

return Page