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.boot")
local SplashPage = require('titlescreen.splash')
local ModeSelectPage = require("titlescreen.pages.modeselect.modeselectpage")
local ServiceMenuPage = require("titlescreen.pages.service.mainmenupage")

local TitleScreen = require('titlescreen.title')
local ModeSelectScreen = require('titlescreen.modeselect')
local ServiceScreen = require('titlescreen.service')

game.Log("HELLO FROM TITLESCREEN", game.LOGGER_DEBUG)
local screens = {
    [BootPage.__name] = BootPage.new(),
    [SplashPage.__name] = SplashPage.new(),
    --title = titleScreen,
    --[tostring(ModeSelectPage)] = ModeSelectPage.new(),
    --[tostring(ServiceMenuPage)] = ServiceMenuPage.new()
}

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

local function switchScreens(newScreen)
    pageView:replace(newScreen)
    pageView:get():init()
end

screens[BootPage.__name].onInvalidation = function(self)
    switchScreens(screens[SplashPage.__name])
end

screens[SplashPage.__name].onInvalidation = function(self)
    --TODO: TitlePage
    --switchScreens(screens[TitlePage.__name])
end

--[[ TODO: remaining Pages

screens[TitlePage.__name].onInvalidation = function(self)
    switchScreens(screens[ModeSelectPage.__name])
end

screens[ServiceMenuPage.__name].onInvalidation = function(self)
    switchScreens(screens[SplashPage.__name])
end

]]

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

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()

    Dim.updateResolution()

    Wallpaper.render()

    Dim.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