require "common.globals"
require "common.class"

---@type PageRegistry
local instance = nil

---@class PageRegistry
---@field pages Page[]
local PageRegistry = {
    __name = "PageManager"
}

---Create new PageManager instance
---@param params? PageRegistry
---@return PageRegistry
function PageRegistry.new(params)
    params = params or {}

    local self = CreateInstance(PageRegistry, params)

    self.pages = params.pages or {}

    return self
end

---Get PageManager instance
---@return PageRegistry
function PageRegistry.get()
    if not instance then
        instance = PageRegistry.new()
    end

    return instance
end

---Store page with default name
---@param page Page
function PageRegistry:register(page)
    self:addPage(page, page.__name)
end

---Add page to page registry
---@param page Page
---@param name string
function PageRegistry:addPage(page, name)
    if self:getPage(page) then
        game.Log(self.__name .. ":storePage() : page `" .. tostring(page) .. "` already stored, overwriting...", game.LOGGER_WARNING)
    else
        game.Log(self.__name .. ":storePage() : stored page `" .. tostring(page) .. "` with key '" .. page.__name .. "'", game.LOGGER_DEBUG)
    end

    self.pages[name] = page
end

---Get page by name or by class (default name)
---@param page string|Page
function PageRegistry:getPage(page)
    if type(page) == "string" then
        return self.pages[page]
    elseif type(page) == "table" and page.__name then
        return self.pages[page.__name]
    end

    game.Log(self.__name .. ":getPage() : invalid parameter (" .. tostring(page) .. ")", game.LOGGER_WARNING)
    return nil
end

return PageRegistry