--=====================================================================================
-- BLU Utils Module
-- Shared utility functions
--=====================================================================================

local addonName = ...
local BLU = _G["BLU"]
local Utils = {}
BLU.Modules["utils"] = Utils

-- Sound queue for managing multiple sounds
Utils.soundQueue = {}
Utils.isPlaying = false
Utils.queueHead = 1
Utils.queueTail = 0
Utils.recentQueuedSounds = {}

local SOUND_QUEUE_HARD_CAP = 40
local SOUND_QUEUE_DEDUPE_WINDOW_SECONDS = 0.15

local function GetQueueSize(self)
    if self.queueTail < self.queueHead then
        return 0
    end

    return (self.queueTail - self.queueHead) + 1
end

local function EnqueueSound(self, soundData)
    self.queueTail = self.queueTail + 1
    self.soundQueue[self.queueTail] = soundData
end

local function DequeueSound(self)
    if self.queueTail < self.queueHead then
        return nil
    end

    local soundData = self.soundQueue[self.queueHead]
    self.soundQueue[self.queueHead] = nil
    self.queueHead = self.queueHead + 1

    if self.queueHead > self.queueTail then
        self.queueHead = 1
        self.queueTail = 0
    end

    return soundData
end

-- Initialize utils module
function Utils:Init()
    self.soundQueue = {}
    self.queueHead = 1
    self.queueTail = 0
    self.recentQueuedSounds = {}
    self.isPlaying = false
    BLU:PrintDebug("[Utils] Utils module initialized")
end

function Utils:DeepCopy(value, seen)
    if type(value) ~= "table" then
        return value
    end

    seen = seen or {}
    if seen[value] then
        return seen[value]
    end

    local copy = {}
    seen[value] = copy

    for k, v in pairs(value) do
        copy[self:DeepCopy(k, seen)] = self:DeepCopy(v, seen)
    end

    return setmetatable(copy, getmetatable(value))
end

-- Queue a sound to be played
function Utils:QueueSound(soundFile, volume, callback)
    BLU:PrintDebug("[Utils] QueueSound called for '" .. tostring(soundFile) .. "' at volume " .. tostring(volume))
    if not BLU.db.profile.queueSounds then
        -- Just play immediately if queuing is disabled
        BLU:PrintDebug("[Utils] Queue disabled; playing sound immediately")
        self:PlaySoundFile(soundFile, volume, callback)
        return
    end

    local now = GetTime and GetTime() or 0
    local signature = tostring(soundFile) .. "|" .. tostring(volume)
    local lastQueuedAt = self.recentQueuedSounds[signature]
    if lastQueuedAt and (now - lastQueuedAt) < SOUND_QUEUE_DEDUPE_WINDOW_SECONDS then
        BLU:PrintDebug("[Utils] Skipped duplicate queued sound '" .. tostring(soundFile) .. "'")
        return
    end
    self.recentQueuedSounds[signature] = now

    -- Add to queue
    local configuredMaxSize = tonumber(BLU.db.profile.maxQueueSize) or 3
    if configuredMaxSize < 1 then
        configuredMaxSize = 1
    end
    local maxSize = math.min(configuredMaxSize, SOUND_QUEUE_HARD_CAP)
    if GetQueueSize(self) >= maxSize then
        BLU:PrintDebug("[Utils] Queue full; dropping oldest queued sound")
        DequeueSound(self)
    end

    EnqueueSound(self, {
        file = soundFile,
        volume = volume,
        callback = callback
    })
    BLU:PrintDebug("[Utils] Queued sound. Queue size is now " .. tostring(GetQueueSize(self)))

    -- Process queue if not already playing
    if not self.isPlaying then
        BLU:PrintDebug("[Utils] Queue idle; starting processing")
        self:ProcessSoundQueue()
    end
end

-- Process sound queue
function Utils:ProcessSoundQueue()
    BLU:PrintDebug("[Utils] ProcessSoundQueue called")
    local sound = DequeueSound(self)
    if not sound then
        self.isPlaying = false
        BLU:PrintDebug("[Utils] Sound queue empty")
        return
    end

    self.isPlaying = true
    BLU:PrintDebug("[Utils] Playing next queued sound '" .. tostring(sound.file) .. "'")

    self:PlaySoundFile(sound.file, sound.volume, function()
        if sound.callback then
            sound.callback()
        end
        
        -- Play next sound after a short delay
        C_Timer.After(0.1, function()
            BLU:PrintDebug("[Utils] Advancing queued sound playback")
            self:ProcessSoundQueue()
        end)
    end)
end

-- Play a sound file
function Utils:PlaySoundFile(soundFile, volume, callback)
    BLU:PrintDebug("[Utils] PlaySoundFile called for '" .. tostring(soundFile) .. "' at volume " .. tostring(volume))
    local channel = BLU.db.profile.soundChannel or "Master"
    local willPlay, handle = PlaySoundFile(soundFile, channel)
    
    if willPlay then
        BLU:PrintDebug("[Utils] PlaySoundFile succeeded on channel '" .. tostring(channel) .. "'")
        -- Stop music if configured
        if BLU.db.profile.interruptMusic then
            BLU:PrintDebug("[Utils] interruptMusic enabled; stopping music")
            StopMusic()
        end
        
        -- Set volume if supported
        if handle and volume then
            -- Note: WoW doesn't support per-sound volume, this is for future use
        end
        
        if callback then
            -- Estimate duration and call callback
            BLU:PrintDebug("[Utils] Scheduling playback callback")
            C_Timer.After(2, callback)
        end
    else
        BLU:PrintDebug("[Utils] Failed to play sound: " .. tostring(soundFile))
        if callback then
            callback()
        end
    end
end

-- Format time duration
function Utils:FormatDuration(seconds)
    if seconds < 60 then
        return string.format("%ds", seconds)
    elseif seconds < 3600 then
        return string.format("%dm %ds", seconds / 60, seconds % 60)
    else
        return string.format("%dh %dm", seconds / 3600, (seconds % 3600) / 60)
    end
end

-- Throttle function calls
Utils.throttleTimers = {}
function Utils:Throttle(key, seconds, func)
    local now = GetTime()
    
    if not self.throttleTimers[key] or (now - self.throttleTimers[key]) >= seconds then
        self.throttleTimers[key] = now
        BLU:PrintDebug("[Utils] Throttle executing key '" .. tostring(key) .. "'")
        return func()
    end
    BLU:PrintDebug("[Utils] Throttle skipped key '" .. tostring(key) .. "'")
end

-- Debounce function calls
Utils.debounceTimers = {}
function Utils:Debounce(key, seconds, func)
    if self.debounceTimers[key] then
        BLU:PrintDebug("[Utils] Debounce cancelling existing timer for key '" .. tostring(key) .. "'")
        self.debounceTimers[key]:Cancel()
    end
    
    BLU:PrintDebug("[Utils] Debounce scheduling key '" .. tostring(key) .. "' for " .. tostring(seconds) .. " seconds")
    self.debounceTimers[key] = C_Timer.NewTimer(seconds, func)
end

-- Get addon memory usage
function Utils:GetMemoryUsage()
    UpdateAddOnMemoryUsage()
    local usage = GetAddOnMemoryUsage("BLU")
    return usage
end

-- Format memory size
function Utils:FormatMemory(kb)
    if kb < 1024 then
        return string.format("%.1f KB", kb)
    else
        return string.format("%.2f MB", kb / 1024)
    end
end

-- Check if in combat
function Utils:IsInCombat()
    return InCombatLockdown()
end

-- Safe function call (delays if in combat)
function Utils:SafeCall(func)
    if self:IsInCombat() then
        BLU:PrintDebug("[Utils] SafeCall queued until combat ends")
        local eventId = "utils_safe_call_" .. tostring(GetTime and GetTime() or 0) .. "_" .. tostring(math.random(100000, 999999))
        BLU:RegisterEvent("PLAYER_REGEN_ENABLED", function()
            BLU:UnregisterEvent("PLAYER_REGEN_ENABLED", eventId)
            BLU:PrintDebug("[Utils] SafeCall executing deferred function")
            func()
        end, eventId)
    else
        BLU:PrintDebug("[Utils] SafeCall executing immediately")
        func()
    end
end

-- Color text with hex color
function Utils:ColorText(text, color)
    return string.format("|cff%s%s|r", color, text)
end

-- Common colors
Utils.colors = {
    blu = "05dffa",
    green = "00ff00",
    red = "ff0000",
    yellow = "ffff00",
    orange = "ff8000",
    purple = "9d4dc5",
    white = "ffffff",
    gray = "808080"
}

-- Export module
return Utils
