require("common.globals")
local Common = require("common.util")
local Dim = require("common.dimensions")
local Wallpaper = require("components.wallpaper")

local PageView = require("api.page.pageview")

local BootPage = require("titlescreen.pages.boot.bootpage")
local ModeSelectPage = require("titlescreen.pages.modeselect.modeselectpage")
local ServiceMenuPage = require("titlescreen.pages.service.mainmenupage")

local BootScreen = require('titlescreen.boot')
local SplashScreen = require('titlescreen.splash')
local TitleScreen = require('titlescreen.title')
local ModeSelectScreen = require('titlescreen.modeselect')
local ServiceScreen = require('titlescreen.service')


local screens = {
    [tostring(BootScreen)] = BootScreen.new(),
    --splash = splashScreen,
    --title = titleScreen,
    --[tostring(ModeSelectPage)] = ModeSelectPage.new(),
    --[tostring(ServiceMenuPage)] = ServiceMenuPage.new()
}

--local currentScreen = game.GetSkinSetting("animations_skipIntro") and screens.title or screens.boot -- show boot screen if skipIntro is not set
local currentScreen = screens[tostring(BootScreen)]

---@param obj ScreenCallbackObject
local function onDeactivationCallback(obj)
    currentScreen = screens[obj.hint]
end

for _, value in pairs(screens) do
    value.onDeactivation = onDeactivationCallback
end

local function deltaKnob(delta)
    -- what the hell does this do?
    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
            currentScreen:handleKnobInput(game.KNOB_LEFT, knobProgress[1])
        end

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

function render(deltaTime)
    handleKnobs()

    Dim.updateResolution()

    Wallpaper.render()

    Dim.transformToScreenSpace()

    currentScreen:render(deltaTime)
end

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

function button_pressed(button)
    currentScreen:handleButtonInput(button)
end