require("common.class")
local Util = require("common.util")
local ServiceField = require("api.page.servicefield")

---@class CheckUpdateField: ServiceField
---@field onUpdateAvailable nil|fun(url: string, version: string)
---@field _timer number
local CheckUpdateField = {
    __name = "CheckUpdateField",
    PROGRESS_FREQ = 3, -- seconds
    CHECK_UPDATE_TIMEOUT = 5, -- seconds
}

---Create a new CheckUpdateField instance
---@param params? CheckUpdateField # initial parameters
---@return CheckUpdateField
function CheckUpdateField.new(params)
    params = params or {}

    params.onUpdateAvailable = params.onUpdateAvailable or nil

    local self = CreateInstance(CheckUpdateField, params, ServiceField)

    self._timer = 0

    self._url = nil
    self._version = nil
    self._onUpdateAvailableFired = false

    return self
end

function CheckUpdateField:drawLabel(deltaTime)
    local text = self.label
    local progress = math.ceil(Util.lerp(self._timer % self.PROGRESS_FREQ,
        0, 0, self.PROGRESS_FREQ, 4
    ))
    text = text .. string.rep(".", progress)

    gfx.FontSize(self.FONT_SIZE)
    gfx.LoadSkinFont(self.FONT_FACE)
    gfx.TextAlign(gfx.TEXT_ALIGN_LEFT | gfx.TEXT_ALIGN_TOP)
    gfx.FillColor(table.unpack(self.FONT_COLOR))
    gfx.Text(text, 0, 0)
end

function CheckUpdateField:drawValue(deltaTime)

end

function CheckUpdateField:tick(deltaTime)
    if not self._onUpdateAvailableFired then
        if self._timer > self.CHECK_UPDATE_TIMEOUT then
            self._url, self._version = game.UpdateAvailable()
            -- self._url = "" -- debug code to force onUpdateAvailable()
            if self._url then
                self.onUpdateAvailable(self._url, self._version)
                self._onUpdateAvailableFired = true
            else
                self:getParentPage():onInvalidation() -- Exit out of bootscreen
            end
        end
    end
    self._timer = self._timer + deltaTime
end

function CheckUpdateField:render(deltaTime)
    self:tick(deltaTime)
    ServiceField.render(self, deltaTime)
end

return CheckUpdateField