require "common.globals"
local Common = require "common.util"
local Display = require "scripts.graphics.display"
local Wallpaper = require "components.wallpaper"

local PageView = require "api.page.pageview"
local PageRegistry = require "api.page.pageregistry"

local BootPage = require "titlescreen.boot"
local SplashPage = require "titlescreen.splash"
local TitlePage = require "titlescreen.title"
local MainMenuPage = require "titlescreen.mainmenu"

local ServiceMenuPage = require "titlescreen.service"
local VersionInfoPage = require "titlescreen.service.versioninfopage"

local pageView = PageView.new()

pageView.onNavigated = function(self, back)
    game.Log(tostring(self) .. " navigated " .. (back and "back " or "") .. "to: " .. tostring(pageView:get()),
        game.LOGGER_INFO
    )
end

pageView.onEmptied = function(self)
    game.Log(tostring(self) .. " empty!", game.LOGGER_WARNING)
end

PageRegistry:getOrCreatePage(BootPage).onInvalidation = function(self, toVersionPage)
    if toVersionPage then
        pageView:replace(PageRegistry:getOrCreatePage(ServiceMenuPage))
        pageView:get():init()
        pageView:navigate(PageRegistry:getOrCreatePage(VersionInfoPage))
        pageView:get():init()
    else
        pageView:replace(PageRegistry:getOrCreatePage(SplashPage))
        pageView:get():init()
    end
end

PageRegistry:getOrCreatePage(SplashPage).onInvalidation = function(self)
    pageView:replace(PageRegistry:getOrCreatePage(TitlePage))
    pageView:get():init()
end

PageRegistry:getOrCreatePage(TitlePage).onInvalidation = function(self, toServiceMenu)
    if toServiceMenu then
        pageView:replace(PageRegistry:getOrCreatePage(ServiceMenuPage))
        pageView:get():init()
    else
        pageView:replace(PageRegistry:getOrCreatePage(MainMenuPage))
        pageView:get():init()
    end
end

PageRegistry:getOrCreatePage(ServiceMenuPage).onInvalidation = function(self)
    pageView:replace(PageRegistry:getOrCreatePage(SplashPage))
    pageView:get():init()
end

--local currentScreen = game.GetSkinSetting("animations_skipIntro") and screens.title or screens.boot -- show boot screen if skipIntro is not set
pageView:replace(PageRegistry:getOrCreatePage(BootPage))
pageView:get():init()

local function deltaKnob(delta)
    -- can someone tell me what the hell does this do? - Hersi
    if math.abs(delta) > 1.5 * math.pi then
        return delta + 2 * math.pi * Common.sign(delta) * -1
    end
    return delta
end

local lastKnobs = nil
local knobThreshold = (2 * math.pi) / 360
local function handleKnobs()
    if lastKnobs == nil then
        lastKnobs = {game.GetKnob(game.KNOB_LEFT), game.GetKnob(game.KNOB_RIGHT)}
    else
        local newKnobs = {game.GetKnob(game.KNOB_LEFT), game.GetKnob(game.KNOB_RIGHT)}
        local knobProgress = {deltaKnob(lastKnobs[1] - newKnobs[1]), deltaKnob(lastKnobs[2] - newKnobs[2])}
        lastKnobs = newKnobs

        if math.abs(knobProgress[1]) > knobThreshold then
            if pageView:get() then
                pageView:get():handleKnobInput(game.KNOB_LEFT, knobProgress[1])
            end
        end

        if math.abs(knobProgress[2]) > knobThreshold then
            if pageView:get() then
                pageView:get():handleKnobInput(game.KNOB_RIGHT, knobProgress[2])
            end
        end
    end
end

function render(deltaTime)
    handleKnobs()

    Display.updateResolution()

    Wallpaper.render()

    Display.transformToScreenSpace()

    pageView:render(deltaTime)
end

function mouse_pressed(button)
    local mouseX, mouseY = game.GetMousePos()
    if pageView:get() then
        pageView:get():handleMouseInput(mouseX, mouseY, button)
    end
    return 0 --THIS '0' IS VERY IMPORTANT, IT WILL CRASH VERY HARD WITHOUT THIS
end

function button_pressed(button)
    if pageView:get() then
        pageView:get():handleButtonInput(button)
    end
end