local g_loggingEnabled = false

ZO_SceneManager_Follower = ZO_SceneManager_Base:Subclass()

function ZO_SceneManager_Follower:Initialize(...)
    ZO_SceneManager_Base.Initialize(self, ...)

    EVENT_MANAGER:RegisterForEvent("SceneManager", EVENT_LEADER_TO_FOLLOWER_SYNC, function(eventId, ...) self:OnLeaderToFollowerSync(...) end)
end

function ZO_SceneManager_Follower:OnLeaderToFollowerSync(messageOrigin, syncType, currentSceneName, nextSceneName, sequenceNumber, currentSceneFragmentsComplete)
    if messageOrigin ~= ZO_REMOTE_SCENE_CHANGE_ORIGIN then
        local currentScene = self:GetScene(currentSceneName)
        local nextScene = self:GetScene(nextSceneName)

        --This case is just updating the destination for a show in progress
        if syncType == REMOTE_SCENE_SYNC_TYPE_CHANGE_NEXT_SCENE then
            self:Log(string.format("Changed Next Scene to %s", nextSceneName))
            if nextScene == nil then
                --if the next scene is a scene that we don't know then use the base scene instead
                self:Log(string.format("Sync Next Scene (%s) Unknown. Setting Next to Base Scene", nextSceneName), self.baseScene:GetName())
                nextScene = self.baseScene
            end
            self:SetNextScene(nextScene)

            -- When we start hiding the current scene we update its fragments based on what the next scene is
            -- If the next scene has the fragments then we will not hide them because they will be showing
            -- However, it is possible that the next scene is changed before we fully hide the current scene
            -- so we need to refresh the current scene's fragments so they hide/show as appropriate for the next scene
            if self.currentScene and self.currentScene:IsHiding() then
                self.currentScene:RefreshFragments()
            end            
        else
            --This case is for a new hide or show, and also updating the fragment complete state of the current scene
            local syncTypeName = syncType == REMOTE_SCENE_SYNC_TYPE_SHOW_SCENE and "Show" or "Hide"
            self:Log(string.format("Sync %s: Current(%s) Next(%s) FragsDone(%s) Seq(%d)", syncTypeName, currentSceneName, nextSceneName, currentSceneFragmentsComplete and "T" or "F", sequenceNumber))

            -- set current scene
            if currentSceneName == ZO_REMOTE_SCENE_NO_SCENE_IDENTIFIER then
                self:SetCurrentScene(nil)
            else
                local currentSceneToSet = currentScene
                if currentSceneToSet == nil then
                    --if the current scene is a scene that we don't know then use the base scene instead
                    self:Log(string.format("Sync Current Scene (%s) Unknown. Setting Current to Base Scene", currentSceneName), self.baseScene:GetName())
                    currentSceneToSet = self.baseScene
                end
                self:SetCurrentScene(currentSceneToSet)
            end

            -- set next scene
            if nextSceneName == ZO_REMOTE_SCENE_NO_SCENE_IDENTIFIER then
                self:SetNextScene(nil)
            else
                if nextScene == nil then
                    --if the next scene is a scene that we don't know then use the base scene instead
                    self:Log(string.format("Sync Next Scene (%s) Unknown. Setting Next to Base Scene", nextSceneName), self.baseScene:GetName())
                    nextScene = self.baseScene
                end
                self:SetNextScene(nextScene)
            end

            -- determine if we need to show/hide the current scene
            if syncType == REMOTE_SCENE_SYNC_TYPE_SHOW_SCENE then
                if currentScene == nil then
                    --It's likely we were told about a scene changing that we don't have in our SceneManager,
                    --so we will use our base scene (the empty scene) so we don't interfere with the unknown scene.
                    --This is basically deactivating the scene manager until we hear about something we know.
                    if not self.baseScene:IsShowing() then
                        self:Log(string.format("Sync Show Scene (%s) Unknown. Showing Base Scene", currentSceneName), self.baseScene:GetName())
                        self:ShowScene(self.baseScene, sequenceNumber)
                    else
                        self:Log(string.format("Sync Show Scene (%s) Unknown. Base Scene Already Shown", currentSceneName), self.baseScene:GetName())
                    end
                else
                    --We were just told to show a scene we do know about. First get the base scene (the empty scene) out of the way
                    --then show the requested scene. The empty scene will hide instantly. This is like reactivating the scene manager.
                    if self.baseScene:IsShowing() then
                        self:HideScene(self.baseScene, sequenceNumber)
                    end
                    if not currentScene:IsShowing() then
                        self:ShowScene(currentScene, sequenceNumber)
                    end
                end
            elseif syncType == REMOTE_SCENE_SYNC_TYPE_HIDE_SCENE then
               if currentScene then
                    if not currentScene:IsHiding() then
                        self:HideScene(currentScene, sequenceNumber)
                    end
                else
                    --Ignore any hides that we don't know about. The shows we don't know about control the activate/deactivate.
                    self:Log(string.format("Sync Hide Scene (%s) Unknown. It had no effect!", currentSceneName))
                end
            end

            -- update scene if its remote scene has finished it fragment transition
            if currentSceneFragmentsComplete then
                self:OnRemoteSceneFinishedFragmentTransition(messageOrigin, currentSceneName, sequenceNumber)
            end
        end
    end
end

function ZO_SceneManager_Follower:OnSceneStateHidden(scene)
    local lastSceneGroup = scene:GetSceneGroup()
    local nextSceneGroup
    if self.nextScene then
        nextSceneGroup = self.nextScene:GetSceneGroup()
    end

    if lastSceneGroup ~= nextSceneGroup then
        if lastSceneGroup ~= nil then
            lastSceneGroup:SetState(SCENE_GROUP_HIDDEN)
        end
        if nextSceneGroup ~= nil then
            nextSceneGroup:SetState(SCENE_GROUP_SHOWING)
        end
    end
end

-- We don't have a stack, so we can only really check if it's the current scene
function ZO_SceneManager_Follower:IsSceneOnStack(sceneName)
    if self.currentScene and self.currentScene:GetName() == sceneName then
        return true
    end

    return false
end

-- Without our own stack we don't know if a scene was ever on it, so return false
function ZO_SceneManager_Follower:WasSceneOnStack(sceneName)
    return false
end

-- Without a stack we can only really check if the scene is the current scene
-- and is being replaced
function ZO_SceneManager_Follower:WasSceneOnTopOfStack(sceneName)
    if self.currentScene and self.nextScene then
        return self.currentScene:GetName() == sceneName
    end

    return false
end

function ZO_SceneManager_Follower:Push(sceneName)
    MakeRemoteSceneRequest(ZO_REMOTE_SCENE_CHANGE_ORIGIN, REMOTE_SCENE_REQUEST_TYPE_PUSH, sceneName)
    self:Log("Request Remote Push", sceneName)
end

function ZO_SceneManager_Follower:SwapCurrentScene(newCurrentSceneName)
    MakeRemoteSceneRequest(ZO_REMOTE_SCENE_CHANGE_ORIGIN, REMOTE_SCENE_REQUEST_TYPE_SWAP, newCurrentSceneName)
    self:Log("Request Remote Swap", newCurrentSceneName)
end

function ZO_SceneManager_Follower:Show(sceneName)
    MakeRemoteSceneRequest(ZO_REMOTE_SCENE_CHANGE_ORIGIN, REMOTE_SCENE_REQUEST_TYPE_SHOW, sceneName)
    self:Log("Request Remote Show", sceneName)
end

function ZO_SceneManager_Follower:Hide(sceneName)
    MakeRemoteSceneRequest(ZO_REMOTE_SCENE_CHANGE_ORIGIN, REMOTE_SCENE_REQUEST_TYPE_HIDE, sceneName)
    self:Log("Request Remote Hide", sceneName)
end

function ZO_SceneManager_Follower:RequestShowLeaderBaseScene()
    MakeRemoteSceneRequest(ZO_REMOTE_SCENE_CHANGE_ORIGIN, REMOTE_SCENE_REQUEST_TYPE_SHOW_BASE_SCENE, "")
    self:Log("Request Remote Show Base Scene", "")
end

function ZO_SceneManager_Follower:SendFragmentCompleteMessage()
    local currentScene = self:GetCurrentScene()
    local currentSceneName = currentScene:GetName()
    NotifyThatFollowerFinishedFragmentTransition(ZO_REMOTE_SCENE_CHANGE_ORIGIN, currentSceneName, currentScene:GetSequenceNumber())
end

function ZO_SceneManager_Follower:Log(message, sceneName)
    if WriteToInterfaceLog and g_loggingEnabled then
        if sceneName then
            WriteToInterfaceLog(string.format("%s - %s - %s", ZO_Scene_GetOriginColor():Colorize(GetString("SI_SCENEMANAGERMESSAGEORIGIN", ZO_REMOTE_SCENE_CHANGE_ORIGIN)), message, sceneName))
        else
            WriteToInterfaceLog(string.format("%s - %s", ZO_Scene_GetOriginColor():Colorize(GetString("SI_SCENEMANAGERMESSAGEORIGIN", ZO_REMOTE_SCENE_CHANGE_ORIGIN)), message))
        end
    end
end