setfenv(1, VoiceOver)

if not strsplit then
    function strsplit(delimiter, text)
        local result = {}
        local from = 1
        local delim_from, delim_to = string.find(text, delimiter, from)
        while delim_from do
            table.insert(result, string.sub(text, from, delim_from - 1))
            from = delim_to + 1
            delim_from, delim_to = string.find(text, delimiter, from)
        end
        table.insert(result, string.sub(text, from))
        return unpack(result)
    end
end

if not GetAddOnEnableState then
    function GetAddOnEnableState(character, addon)
        addon = addon or character -- GetAddOnEnableState([character], addon)
        local name, _, _, _, loadable, reason = _G.GetAddOnInfo(addon)
        if not name or not loadable and reason == "DISABLED" then
            return 0
        end
        return 2
    end

    function GetAddOnInfo(indexOrName)
        local name, title, notes, enabled, loadable, reason, security, newVersion = _G.GetAddOnInfo(indexOrName)
        return name, title, notes, loadable, reason, security, newVersion
    end
end

if not GetQuestID then
    local source, text
    local old_QUEST_DETAIL = Addon.QUEST_DETAIL
    local old_QUEST_PROGRESS = Addon.QUEST_PROGRESS
    local old_QUEST_COMPLETE = Addon.QUEST_COMPLETE
    function Addon:QUEST_DETAIL()   source = "accept"   text = GetQuestText()    old_QUEST_DETAIL(self) end
    function Addon:QUEST_PROGRESS() source = "progress" text = GetProgressText() old_QUEST_PROGRESS(self) end
    function Addon:QUEST_COMPLETE() source = "complete" text = GetRewardText()   old_QUEST_COMPLETE(self) end
    function GetQuestID()
        local npcName = Utils:GetNPCName()
        if Utils:IsNPCPlayer() then
            -- Can't do anything about quest sharing currently, because we need the original questgiver's name to obtain quest ID, and we need quest ID to obtain the questgiver's name
            return 0
        end

        return DataModules:GetQuestID(source, GetTitleText(), npcName, text) or 0
    end
end

if not QUESTS_DISPLAYED then
    if QuestLogScrollFrame then
        QUESTS_DISPLAYED = getn(QuestLogScrollFrame.buttons)
    end
end

-- Not sure when exactly were UI-Cursor-Move and UI-Cursor-SizeRight added, but the former was present in 6.0.1
if Version:IsBelowLegacyVersion(60000) then
    function SetCursor() end
end

Enums.GUID.Player     = tonumber("0000", 16)
Enums.GUID.Item       = tonumber("4000", 16)
Enums.GUID.Creature   = tonumber("F130", 16)
Enums.GUID.Vehicle    = tonumber("F150", 16)
Enums.GUID.GameObject = tonumber("F110", 16)

function Utils:GetGUIDType(guid)
    return guid and tonumber(guid:sub(3, 3 + 4 - 1), 16)
end

function Utils:GetIDFromGUID(guid)
    if not guid then
        return
    end
    local type = assert(self:GetGUIDType(guid), format([[Failed to determine the type of GUID "%s"]], guid))
    assert(Enums.GUID:GetName(type), format([[Unknown GUID type %d]], type))
    assert(Enums.GUID:CanHaveID(type), format([[GUID "%s" does not contain ID]], guid))
    return tonumber(guid:sub(7, 7 + 6 - 1), 16)
end

function Utils:MakeGUID(type, id)
    assert(Enums.GUID:CanHaveID(type), format("GUID of type %d (%s) cannot contain ID", type, Enums.GUID:GetName(type) or "Unknown"))
    return format("0x%04X%06X%06X", type, id, 0)
end

-- Patch 6.0.2 (2014-10-14): Removed returns 'questTag' and 'isDaily'. Added returns 'frequency', 'isOnMap', 'hasLocalPOI', 'isTask', and 'isStory'.
if Version:IsBelowLegacyVersion(60000) then
    function GetQuestLogTitle(questIndex)
        local title, level, questTag, suggestedGroup, isHeader, isCollapsed, isComplete, isDaily, questID, displayQuestID = _G.GetQuestLogTitle(questIndex)
        local frequency = isDaily and 2 or 1
        return title, level, suggestedGroup, isHeader, isCollapsed, isComplete, frequency, questID
    end
end

local FrameMixins = {}
local ModelMixins = {}
local hookFrame
local hookModel
function CreateFrame(frameType, name, parent, template)
    if UIParent.SetBackdrop and template == "BackdropTemplate" then
        template = nil
    end

    local frame = _G.CreateFrame(frameType, name, parent, template)
    for k, v in pairs(FrameMixins) do
        if not frame[k] then
            frame[k] = v
        end
    end
    if hookFrame then
        hookFrame(frame)
    end
    if frameType == "Model" or frameType == "PlayerModel" or frameType == "DressUpModel" then
        for k, v in pairs(ModelMixins) do
            if not frame[k] then
                frame[k] = v
            end
        end
        if hookModel then
            hookModel(frame)
        end
    end
    return frame
end

function FrameMixins:SetResizeBounds(minWidth, minHeight, maxWidth, maxHeight)
    self:SetMinResize(minWidth, minHeight)
    if maxWidth and maxHeight then
        self:SetMaxResize(maxWidth, maxHeight)
    end
end
function ModelMixins:SetAnimation(animation)
    self:SetSequence(animation)
end
function ModelMixins:SetCustomCamera(camera)
    self:SetCamera(camera)
end
-- Patch 7.0.3 (2016-07-19): Added.
if Version:IsBelowLegacyVersion(70000) then
    local modelToFileID = {
        ["Original"] = {
            ["interface/buttons/talktomequestion_white"]                = 130737,

            ["character/bloodelf/female/bloodelffemale"]                = 116921,
            ["character/bloodelf/male/bloodelfmale"]                    = 117170,
            ["character/broken/female/brokenfemale"]                    = 117400,
            ["character/broken/male/brokenmale"]                        = 117412,
            ["character/draenei/female/draeneifemale"]                  = 117437,
            ["character/draenei/male/draeneimale"]                      = 117721,
            ["character/dwarf/female/dwarffemale"]                      = 118135,
            ["character/dwarf/female/dwarffemale_hd"]                   = 950080,
            ["character/dwarf/female/dwarffemale_npc"]                  = 950080,
            ["character/dwarf/male/dwarfmale"]                          = 118355,
            ["character/dwarf/male/dwarfmale_hd"]                       = 878772,
            ["character/dwarf/male/dwarfmale_npc"]                      = 878772,
            ["character/felorc/female/felorcfemale"]                    = 118652,
            ["character/felorc/male/felorcmale"]                        = 118653,
            ["character/felorc/male/felorcmaleaxe"]                     = 118654,
            ["character/felorc/male/felorcmalesword"]                   = 118667,
            ["character/foresttroll/male/foresttrollmale"]              = 118798,
            ["character/gnome/female/gnomefemale"]                      = 119063,
            ["character/gnome/female/gnomefemale_hd"]                   = 940356,
            ["character/gnome/female/gnomefemale_npc"]                  = 940356,
            ["character/gnome/male/gnomemale"]                          = 119159,
            ["character/gnome/male/gnomemale_hd"]                       = 900914,
            ["character/gnome/male/gnomemale_npc"]                      = 900914,
            ["character/goblin/female/goblinfemale"]                    = 119369,
            ["character/goblin/male/goblinmale"]                        = 119376,
            ["character/goblinold/male/goblinoldmale"]                  = 119376,
            ["character/human/female/humanfemale"]                      = 119563,
            ["character/human/female/humanfemale_hd"]                   = 1000764,
            ["character/human/female/humanfemale_npc"]                  = 1000764,
            ["character/human/male/humanmale"]                          = 119940,
            ["character/human/male/humanmale_cata"]                     = 119940,
            ["character/human/male/humanmale_hd"]                       = 1011653,
            ["character/human/male/humanmale_npc"]                      = 1011653,
            ["character/icetroll/male/icetrollmale"]                    = 232863,
            ["character/naga_/female/naga_female"]                      = 120263,
            ["character/naga_/male/naga_male"]                          = 120294,
            ["character/nightelf/female/nightelffemale"]                = 120590,
            ["character/nightelf/female/nightelffemale_hd"]             = 921844,
            ["character/nightelf/female/nightelffemale_npc"]            = 921844,
            ["character/nightelf/male/nightelfmale"]                    = 120791,
            ["character/nightelf/male/nightelfmale_hd"]                 = 974343,
            ["character/nightelf/male/nightelfmale_npc"]                = 974343,
            ["character/northrendskeleton/male/northrendskeletonmale"]  = 233367,
            ["character/orc/female/orcfemale"]                          = 121087,
            ["character/orc/female/orcfemale_npc"]                      = 121087,
            ["character/orc/male/orcmale"]                              = 121287,
            ["character/orc/male/orcmale_hd"]                           = 917116,
            ["character/orc/male/orcmale_npc"]                          = 917116,
            ["character/scourge/female/scourgefemale"]                  = 121608,
            ["character/scourge/female/scourgefemale_hd"]               = 997378,
            ["character/scourge/female/scourgefemale_npc"]              = 997378,
            ["character/scourge/male/scourgemale"]                      = 121768,
            ["character/scourge/male/scourgemale_hd"]                   = 959310,
            ["character/scourge/male/scourgemale_npc"]                  = 959310,
            ["character/skeleton/male/skeletonmale"]                    = 121942,
            ["character/taunka/male/taunkamale"]                        = 233878,
            ["character/tauren/female/taurenfemale"]                    = 121961,
            ["character/tauren/female/taurenfemale_hd"]                 = 986648,
            ["character/tauren/female/taurenfemale_npc"]                = 986648,
            ["character/tauren/male/taurenmale"]                        = 122055,
            ["character/tauren/male/taurenmale_hd"]                     = 968705,
            ["character/tauren/male/taurenmale_npc"]                    = 968705,
            ["character/troll/female/trollfemale"]                      = 122414,
            ["character/troll/female/trollfemale_hd"]                   = 1018060,
            ["character/troll/female/trollfemale_npc"]                  = 1018060,
            ["character/troll/male/trollmale"]                          = 122560,
            ["character/troll/male/trollmale_hd"]                       = 1022938,
            ["character/troll/male/trollmale_npc"]                      = 1022938,
            ["character/tuskarr/male/tuskarrmale"]                      = 122738,
            ["character/vrykul/male/vrykulmale"]                        = 122815,
        },
        ["HD"] = {
            ["character/scourge/female/scourgefemale"]                  = 997378,
        },
    }
    local function CleanupModelName(model)
        return model:lower():gsub("\\", "/"):gsub("%.m2", ""):gsub("%.mdx", "")
    end
    function ModelMixins:GetModelFileID()
        local model = self:GetModel()
        if model and type(model) == "string" then
            model = CleanupModelName(model)
            local models = modelToFileID[Utils:GetCurrentModelSet()] or modelToFileID["Original"]
            return models[model] or modelToFileID["Original"][model]
        end
    end
end

if Version.IsLegacyWrath then

    function Utils:GetQuestLogScrollOffset()
        return HybridScrollFrame_GetOffset(QuestLogScrollFrame)
    end

    function Utils:GetQuestLogTitleFrame(index)
        return _G["QuestLogScrollFrameButton" .. index]
    end

    function Utils:GetQuestLogTitleNormalText(index)
        return _G["QuestLogScrollFrameButton" .. index .. "NormalText"]
    end

    function Utils:GetQuestLogTitleCheck(index)
        return _G["QuestLogScrollFrameButton" .. index .. "Check"]
    end

    local prefix
    local QuestLogTitleButton_Resize = QuestLogTitleButton_Resize
    function QuestOverlayUI:UpdateQuestTitle(questLogTitleFrame, playButton, normalText, questCheck)
        if not prefix then
            local text = normalText:GetText()
            for i = 1, 20 do
                normalText:SetText(string.rep(" ", i))
                if normalText:GetStringWidth() >= 24 then
                    prefix = normalText:GetText()
                    break
                end
            end
            prefix = prefix or "  "
            normalText:SetText(text)
        end

        playButton:SetPoint("LEFT", normalText, "LEFT", 4, 0)
        normalText:SetText(prefix .. (normalText:GetText() or ""):trim())
        QuestLogTitleButton_Resize(questLogTitleFrame)
    end

    hooksecurefunc(Addon, "OnInitialize", function()
        QuestLogScrollFrame.update = QuestLog_Update
    end)

    function Utils:WillSoundPlay(soundData)
        return soundData.fileName and soundData.fileName ~= "missingSound" and soundData.length ~= nil
    end

    function hookModel(self)
        local function HasModelLoaded(self)
            local model = self:GetModel()
            return model and type(model) == "string" and self:GetModelFileID() ~= 130737
        end
        self._sequence = 0
        hooksecurefunc(self, "ClearModel", function(self)
            self._awaitingModel = nil
            self._camera = nil
            self._sequence = 0
            self._sequenceStart = nil
        end)
        local oldSetSequence = self.SetSequence
        function self:SetSequence(sequence)
            self._sequence = sequence
            self._sequenceStart = GetTime()
            if not self._awaitingModel then
                oldSetSequence(self, sequence)
            end
        end
        local oldSetCreature = self.SetCreature
        function self:SetCreature(id)
            self:ClearModel()
            self:SetModel([[Interface\Buttons\TalkToMeQuestion_White.mdx]])
            oldSetCreature(self, id)
            self._awaitingModel = not HasModelLoaded(self)
            if self._awaitingModel then
                self:SetPosition(5, 0, 2)
            end
        end
        local oldSetCamera = self.SetCamera
        function self:SetCamera(id)
            self._camera = id
            if not self._awaitingModel then
                oldSetCamera(self, id)
            end
        end
        self:HookScript("OnUpdate", function(self, elapsed)
            if self._awaitingModel and HasModelLoaded(self) then
                self._awaitingModel = nil
                self:SetPosition(0, 0, 0)

                if self._sequence ~= 0 then
                    self:SetSequence(self._sequence)
                end
            end
            if self._sequence ~= 0 and not self._awaitingModel then
                self:SetSequenceTime(self._sequence, (GetTime() - self._sequenceStart) * 1000)
            end
        end)
    end

    hooksecurefunc(SoundQueueUI, "InitPortrait", function(self)
        self.frame.portrait.pause:HookScript("OnEnter", function()
            if self.frame.portrait.model._awaitingModel then
                GameTooltip:SetOwner(self.frame.portrait.pause, "ANCHOR_NONE")
                GameTooltip:SetPoint("BOTTOMLEFT", self.frame.portrait.pause, "BOTTOMRIGHT", 4, -4)
                GameTooltip:SetText("Uncached NPC", HIGHLIGHT_FONT_COLOR.r, HIGHLIGHT_FONT_COLOR.g, HIGHLIGHT_FONT_COLOR.b)
                GameTooltip:AddLine("Encounter this NPC in the world again to be able to see their model.", NORMAL_FONT_COLOR.r, NORMAL_FONT_COLOR.g, NORMAL_FONT_COLOR.b, 1)
                GameTooltip:Show()
            end
        end)
        self.frame.portrait.pause:HookScript("OnLeave", GameTooltip_Hide)
    end)

    --[[
        Here begins the code the plays the VO over music channel in order to support the ability to pause/stop the VO.
        3.3.5's PlaySound/PlaySoundFile cannot be stopped by any means short of restarting the whole sound system (freezes the client for a couple of seconds).
        But PlayMusic can be stopped with StopMusic. This, however, causes the currently played script music to fade out instead of cutting,
            which is a problem, because by letting this happen we'll hear the VO looping until it fully fades out. This can be worked around
            by PlayMusic'ing another file (even one that doesn't exist), as that causes the script music to be instantly interrupted.
        Toggling Sound_EnableMusic cvar off-and-on additionally allows us to interrupt the current in-game background music.
        The whole process looks as follows:
        1. Sound queue requests to start playing the VO by calling Utils:PlaySound
        2. Music volume is smoothly lowered to 0 over the config.FadeOutMusic duration
        3. In-game background music is instantly stopped by toggling Sound_EnableMusic cvar off-and-on
        4. Music volume is instantly changed to config.Volume level
        5. VO sound file is played on the music channel
        6. Once the VO's duration has ran out (soundData.stopSoundTimer) - silence.wav is played as music to instantly stop the VO and prevent it from looping
        7. Sound queue requests to stop playing the VO by calling Utils:StopSound (either due to pause or soundData being removed from the queue) - silence.wav is played again to interrupt the VO in case it hasn't finished playing naturally
        8. Music volume is instantly changed to 0
        9. Music volume is smoothly raised to back to the pre-VO level over the config.FadeOutMusic duration
        10. In-game background music is removed by calling StopMusic()
    ]]
    local function GetCurrentVolume()
        return tonumber(GetCVar("Sound_MusicVolume")) or 1
    end

    -- Functions that deal with temporarily changing player's sound settings to utilize the music channel for VO playback
    local prev_Sound_EnableMusic
    local prev_Sound_MusicVolume
    local function ReplaceCVars()
        if prev_Sound_EnableMusic == nil then
            prev_Sound_EnableMusic = GetCVar("Sound_EnableMusic")
            prev_Sound_MusicVolume = GetCVar("Sound_MusicVolume")
            SetCVar("Sound_EnableMusic", 1)
        end
    end
    local function RestoreCVars()
        if prev_Sound_EnableMusic ~= nil then
            SetCVar("Sound_EnableMusic", prev_Sound_EnableMusic)
            SetCVar("Sound_MusicVolume", prev_Sound_MusicVolume)
            prev_Sound_EnableMusic = nil
            prev_Sound_MusicVolume = nil
        end
    end

    -- Functions that deal with smoothly changing the music channel's volume to avoid abrupt changes
    local slideVolumeTarget
    local slideVolumeRate
    local slideVolumeCallback
    local EPS_VOLUME = 0.01
    local function GetMusicFadeOutDuration()
        if tonumber(prev_Sound_EnableMusic) == 0 or tonumber(prev_Sound_MusicVolume) == 0 then
            return 0
        end
        return Addon.db.profile.LegacyWrath.PlayOnMusicChannel.FadeOutMusic or 0
    end
    local function StopSlideVolume()
        slideVolumeTarget = nil
        slideVolumeRate = nil
        slideVolumeCallback = nil
    end
    local function SlideVolume(target, callback)
        local duration = GetMusicFadeOutDuration()
        if duration <= 0 then
            -- Instantly change the volume if the player had reduced the duration all the way to 0
            return false
        end
        local current = GetCurrentVolume()
        if math.abs(target - current) <= EPS_VOLUME then
            -- Instantly "change" the volume if it's already fuzzy-equal to the target volume, and cancel the ongoing slide volume ("remove currently played sound from queue" case)
            StopSlideVolume()
            return false
        end
        -- Interpolate towards the target volume over the configured duration
        slideVolumeTarget = target
        slideVolumeRate = (target - current) / duration
        slideVolumeCallback = callback
        return true
    end
    local volumeFrame = CreateFrame("Frame", "VoiceOverSlideVolumeFrame", UIParent)
    volumeFrame:RegisterEvent("PLAYER_LOGOUT")
    volumeFrame:HookScript("OnEvent", function(self, event)
        if event == "PLAYER_LOGOUT" then
            StopSlideVolume()
            RestoreCVars()
        end
    end)
    volumeFrame:HookScript("OnUpdate", function(self, elapsed)
        if slideVolumeRate then
            local current = GetCurrentVolume()
            local target = slideVolumeTarget
            local next = current + slideVolumeRate * elapsed
            local finished = false
            if math.abs(target - current) <= EPS_VOLUME or current < target and next >= target or current > target and next <= target then
                next = target
                finished = true
            end
            SetCVar("Sound_MusicVolume", next)
            if finished then
                if slideVolumeCallback then
                    slideVolumeCallback()
                end
                StopSlideVolume()
            end
        end
    end)

    function Utils:PlaySound(soundData)
        soundData.delay = nil
        if not Addon.db.profile.LegacyWrath.PlayOnMusicChannel.Enabled then
            -- Play VO as a sound, but have no ability to stop it
            _G.PlaySoundFile(soundData.filePath)
            return
        end

        soundData.handle = 1 -- Just put something here to flag the sound as stoppable

        ReplaceCVars()
        local function Play()
            -- Hack to instantly interrupt the music
            SetCVar("Sound_EnableMusic", 0)
            SetCVar("Sound_EnableMusic", 1)

            SetCVar("Sound_MusicVolume", Addon.db.profile.LegacyWrath.PlayOnMusicChannel.Volume)
            PlayMusic(soundData.filePath)

            soundData.stopSoundTimer = Addon:ScheduleTimer(function()
                PlayMusic([[Interface\AddOns\AI_VoiceOver\Sounds\silence.wav]]) -- Instantly interrupt the VO sound
            end, soundData.length)
        end
        if SlideVolume(0, Play) then
            soundData.delay = GetMusicFadeOutDuration()
        else
            Play()
        end
    end

    function Utils:StopSound(soundData)
        if not soundData.handle then
            -- VO was played as a sound - we cannot stop it
            return
        end

        Addon:CancelTimer(soundData.stopSoundTimer)
        soundData.stopSoundTimer = nil

        PlayMusic([[Interface\AddOns\AI_VoiceOver\Sounds\silence.wav]]) -- Instantly interrupt the VO sound
        SetCVar("Sound_MusicVolume", 0)

        local function ResumeMusic()
            StopMusic()
            RestoreCVars()
        end
        if not SlideVolume(tonumber(prev_Sound_MusicVolume) or 1, ResumeMusic) then
            ResumeMusic()
        end
    end

    -- Frame fade-in animation to help alleviate the UX damage caused by delaying the VO
    hooksecurefunc(SoundQueueUI, "InitDisplay", function(self)
        local fadeIn = self.frame:CreateAnimationGroup()
        local animation = fadeIn:CreateAnimation("Alpha")
        animation:SetOrder(1)
        animation:SetDuration(0)
        animation:SetChange(-1)
        animation = fadeIn:CreateAnimation("Alpha")
        animation:SetOrder(2)
        animation:SetDuration(0.75)
        animation:SetChange(1)
        animation:SetSmoothing("OUT")
        self.frame:HookScript("OnShow", function(self)
            fadeIn:Stop()
            local duration = Addon.db.profile.LegacyWrath.PlayOnMusicChannel.Enabled and GetMusicFadeOutDuration() or 0
            if duration > 0 then
                animation:SetDuration(duration)
                fadeIn:Play()
            end
        end)
    end)
end