local _, kbf = ...

KBF = kbf -- make global for debugging

local kbf = LibStub("AceAddon-3.0"):NewAddon(kbf, "KBF", "AceEvent-3.0", "AceConsole-3.0")


function kbf:OnInitialize()
	-- config settings - account wide shared profile by default
	self.db = LibStub("AceDB-3.0"):New("KBFSavedVars", self.defaultConfig, true)
	-- create frames here so that they will be correctly stored in location cache by 
	-- the UI.
	self.anchor, self.secureHeader, self.consolidateHeader, self.consolidateProxy = self:CreateCoreFrames()
    self.debuffFrames = {}
    self:RegisterEvent("UNIT_AURA")
    self:RegisterEvent("UNIT_ENTERING_VEHICLE", "PollForVehicleChange")
    self:RegisterEvent("UNIT_EXITING_VEHICLE", "PollForVehicleChange")
    LibStub("AceConfig-3.0"):RegisterOptionsTable("KBF", self.options);
    self.profilesFrame = LibStub("AceConfigDialog-3.0"):AddToBlizOptions("KBF", "KBF");
    self:RegisterChatCommand("kbf", "ToggleAnchor")
    
    self.oocQueue = {}
end

function kbf:OnEnable()
	-- set up the countdown timer
    -- TODO: Fancy enable/disable based on whether you have any timed buffs.
    -- Not a big deal, how often do you care about that
    -- also TODO: Maybe should bucket OnUpdates somehow
    -- AceTimer repeating events can only happen at 0.1 seconds, which is probably
    -- fast enough for updating, but makes the animation look jerky
    -- need to experiment with using animation groups
    self.update = CreateFrame("FRAME")
    self.update:SetScript("OnUpdate", function() self:OnUpdate() end)
    self.dirty = true -- force an immediate scan on login
    self:HideBlizzardBuffFrames()
end
-- naming convention
-- a "frame" is the top-level button (secure button from the header, or one I make myself)
-- that will contain the UI information about the buff
-- a "bar" is a frame that has the icon, status bar, ect associated with it

-- Secure aura header doesn't self-bind to vehicle,
-- so this only works out of combat. But thats better than nothing...
function kbf:PollForVehicleChange(event, unit)
    if unit ~= "player" then return end
    self.dirty = true
    local function performSwap()
    	if UnitHasVehicleUI("player") then
			-- only swap if we're in a "real" vehicle with its own actions
        	-- There is possibly a timing issue here where
        	-- we have set the poll flag but the unit is not 
        	-- actually "in" the vehicle yet. I'm hoping thats 
        	-- handled by using exited/entered events instead of exiting/entering
            self.secureHeader:SetAttribute("unit", "vehicle")
        else
            self.secureHeader:SetAttribute("unit", "player")
        end
    end
    self:QueueForOOC(performSwap)
end

function kbf:HideBlizzardBuffFrames()
    local function HideBlizFrame(frame)
        if not frame then return end
        frame:UnregisterAllEvents()
        frame:SetScript("OnUpdate", nil)
        frame:Hide()
        frame.Show = function() end
    end
    HideBlizFrame(BuffFrame)
    HideBlizFrame(ConsolidatedBuffs)
    HideBlizFrame(TemporaryEnchantFrame)
    
end

-- enqueues a callable that will be run once in-combat lockdown is past
-- all callables will be executed in a single run, in the order they were enqueued
-- if called when OOC, the function will be called immediately, unless the alwaysQueue parameter is true, 
-- in which case it will be appended normally
function kbf:QueueForOOC(func, alwaysQueue)
	if InCombatLockdown() or alwaysQueue then
		tinsert(self.oocQueue, func)
	else
		func()
	end
end

function kbf:OnUpdate()   
    -- TODO: only start this polling when we leave combat?
    while #self.oocQueue > 0  and not InCombatLockdown() do
		local func = table.remove(self.oocQueue)
		func()
    end
    
    local unit = self.secureHeader:GetAttribute("unit")
    local buffCount = 0
    for idx=1,99 do
        local frame = self.secureHeader:GetAttribute("child"..idx)
        if not (frame and frame:IsShown()) then break end
        local hasbuff = UnitAura(unit, frame:GetAttribute("index"))
        buffCount = buffCount + 1
        if self.dirty then 
            if self:BindBarToBuff(frame, unit) then break end
        end
        self:UpdateBarExpirationTime(frame)
        -- Don't forget to refresh shown tooltips
        if (GameTooltip:IsOwned(frame)) then
            self:OnEnter(frame)
        end
    end
    -- consolidated buffs
    if self.consolidateProxy:IsShown() then
		for idx=1,99 do
			local frame = self.consolidateHeader:GetAttribute("child"..idx)
			if not (frame and frame:IsShown()) then break end
			if self.dirty then 
				if self:BindBarToBuff(frame, unit) then break end
			end
			self:UpdateBarExpirationTime(frame)
			-- Don't forget to refresh shown tooltips
			if ( GameTooltip:IsOwned(frame) ) then
				self:OnEnter(frame)
			end
		end
		buffCount = buffCount+1
	end
	-- SAH correctly binds the weapon enchant templates now, but when temp enchants
	-- are present and used, it seems that it doesn't correctly hide un-bound 
	-- buff frames, which breaks all the layout and so forth.
	for weapon=3,1,-1 do
		local tempEnchant = self.secureHeader:GetAttribute("tempEnchant"..weapon)
		if tempEnchant and tempEnchant:IsShown() then
			self:BindBarToWeaponEnchant(tempEnchant)
			self:UpdateBarExpirationTime(tempEnchant)
			buffCount = buffCount + 1
		end
	end
	
	-- debuffs
	-- Since debuffs aren't cancellable, don't need to use the secure header
	-- for them. This could be rewritten to support useful features like
	-- sorting & scaling and stuff. Honestly, should at least be alphabetical.
    for idx=1,99 do
        local frame = self.debuffFrames[idx]
        if self.dirty then
            local name, rank, icon, stacks, debuffType, duration, expirationTime = UnitAura(unit, idx, "HARMFUL")
            if not name then 
                -- out of debuffs, hide all the rest of them
                for jdx = idx, 99 do
                    local bar = self.debuffFrames[jdx]
                    if bar then bar:Hide() else break end
                end
                break 
            end
            if not frame then
                frame = self:ConstructBar(nil, 1, 0, 0)
                self.debuffFrames[idx] = frame
            end
            self:SetBarAppearance(frame, name, icon, stacks, duration, expirationTime)
            frame:ClearAllPoints()
            -- position it under all the buffs, with a half-bar spacing
            frame:SetPoint("TOP", self.secureHeader, "TOP", 0, (buffCount * -16) - 8)
            frame:Show()
            frame.filter = "HARMFUL"
            frame.unit = unit
            frame.index = idx
            frame:SetScript("OnEnter", function() kbf:OnEnter(frame) end)
            frame:SetScript("OnLeave", function() GameTooltip:Hide() end)
            frame:EnableMouse(true)
            buffCount = buffCount + 1
        else
            -- not dirty, so no frame means we're done
            if not frame then break end
        end
        self:UpdateBarExpirationTime(frame)
        if ( GameTooltip:IsOwned(frame) ) then
            self:OnEnter(frame)
        end
    end
    self.dirty = nil
end

function kbf:UNIT_AURA(event, unit)
    if unit ~= self.secureHeader:GetAttribute("unit") then return end
    self.dirty = true
end

function kbf:UpdateBarExpirationTime(frame)
    if frame.expirationTime then
        local remaining = frame.expirationTime - GetTime()
        remaining = math.max(0, remaining)
        local perc = remaining / frame.duration
        frame.timertext:SetText(self:FormatTimeText(remaining))
        frame.statusbar:SetValue(remaining)
    end
end

local gratt = LibStub:GetLibrary("LibGratuity-3.0")

function kbf:BindBarToWeaponEnchant(parentFrame, slotOverride)
    -- allow passing of explicit slot in order to work around aura header bug
    local slot = slotOverride or parentFrame:GetAttribute("target-slot")
    local itemIndex = slot - 15 -- 1MH, 2OF
    local RETURNS_PER_ITEM = 3
    local hasEnchant, remaining, enchantCharges = select(RETURNS_PER_ITEM * (itemIndex - 1) + 1, GetWeaponEnchantInfo())
    -- remaining time is in milliseconds
    if not hasEnchant then return end -- this should never happen
    local remaining = remaining / 1000
    
    local icon = GetInventoryItemTexture("player", slot)
    local maxDuration
    if select(2, UnitClass("player")) == "ROGUE" then
    	-- Rogues are probably using poisons, which are an hour
    	maxDuration = 60 * 60
    else
    	-- everyone else is probably using something thats a half hour
    	maxDuration = 30 * 60
    end
    local duration = max(maxDuration, remaining)
    local expirationTime = GetTime() + remaining
    local name = GetItemInfo(GetInventoryItemID("player", slot))
    -- try to figure out what the weapon enchant is
    -- tooltip string -> {spellid, duration}
    local knownEnchants = {
    	["Flametongue"] = {8024, 30*60},
    	["Frostbrand"] = {8033, 30*60},
    	["Earthliving"] = {51730, 30*60},
		["Windfury"] = {8232, 30*60},
    	["Instant Poison"] = {8680, 60*60},
    	["Wound Poison"] = {13218, 60*60},
    	["Deadly Poison"] = {2823, 60*60},
    
    }
    local spellId = nil
	if gratt then
		gratt:SetInventoryItem("player", slot)
		for tag, info in pairs(knownEnchants) do
			if gratt:Find(tag) then 
				spellId, duration = unpack(info)
				name, _, _ = GetSpellInfo(spellId)
				local slots = {[16] = "Main Hand", [17] = "Off Hand", [18] = "Thrown"}
				name = tag .. " (" .. slots[slot] .. ")"
				break
			end
		end
	end
    parentFrame.spellId = spellId
    if not parentFrame.icon then
        self:ConstructBar(parentFrame, 1, 0, 1)
    end
    self:SetBarAppearance(parentFrame, name, icon, enchantCharges, duration, expirationTime)
end

function kbf:BindBarToBuff(parentFrame, unit)
    local index = parentFrame:GetAttribute("index")
    local filter = parentFrame:GetAttribute("filter")
    local name, rank, icon, stacks, debuffType, duration, expirationTime, 
        unitCaster, isStealable, shouldConsolidate, spellId = UnitAura(unit, index, filter)
    if not name then return end
    if not parentFrame.icon then
        self:ConstructBar(parentFrame)
    end
    self:SetBarAppearance(parentFrame, name, icon, stacks, duration, expirationTime)
end

function kbf:SetBarAppearance(parentFrame, name, icon, stacks, duration, expirationTime)
    parentFrame.icon:SetNormalTexture(icon)
    if stacks and stacks > 0 then
        parentFrame.text:SetText(string.format("%s(%d)", name, stacks))
    else
        parentFrame.text:SetText(name)
    end
    parentFrame.timertext:SetText(self:FormatTimeText(duration))
    -- store duration information
    if duration and duration > 0 then
        parentFrame.expirationTime = expirationTime
        parentFrame.duration = duration
        parentFrame.statusbar:SetMinMaxValues(0, duration)
    else
        parentFrame.expirationTime = nil
        parentFrame.duration = 0
        parentFrame.statusbar:SetMinMaxValues(0,1)
        parentFrame.statusbar:SetValue(1)
    end
end

-- expects time seconds
function kbf:FormatTimeText(time)
    if not time or time == 0 then return "" end
    local timetext
    local h = floor(time/3600)
    local m = time - (h*3600)
    m = floor(m/60)
    local s = time - ((h*3600) + (m*60))
    if h > 0 then
        timetext = ("%d:%02d"):format(h, m)
    elseif m > 0 then
        timetext = string.format("%d:%02d", m, floor(s))
    elseif s < 10 then
        timetext = string.format("%1.1f", s)
    else
        timetext = string.format("%.0f", floor(s))
    end
    return timetext
end

function KBF:OnEnter(button, motion)
    -- this is for the secure buttons, so use the attributes
    local unit = SecureButton_GetModifiedUnit(button) or button.unit -- will perform vehicle toggle
    local filter = button:GetAttribute("filter") or button.filter 
    local index = button:GetAttribute("index") or button.index
    if unit and filter and index then
        -- I'd like a better place to position this but it's funky for right now, handle it later
        GameTooltip:SetOwner(button, "ANCHOR_BOTTOMLEFT");
        GameTooltip:SetFrameLevel(button:GetFrameLevel() + 2);
        GameTooltip:SetUnitAura(unit, index, filter);
        return
    end
    local slot = button:GetAttribute("target-slot") -- temp enchant
    if slot then
		GameTooltip:SetOwner(button, "ANCHOR_BOTTOMLEFT");
		GameTooltip:SetFrameLevel(button:GetFrameLevel() + 2);
    	if button.spellId then
    		-- TODO: This might be too big of a tooltip to care about that much.
    		-- Maybe I should just have a single line with the weapon name
    		--GameTooltip:SetInventoryItem(unit, slot)
    		local name = GetItemInfo(GetInventoryItemID("player", slot))
    		local r, g, b = GetItemQualityColor(GetInventoryItemQuality("player", slot))
    		GameTooltip:SetText(name, r, g, b)
			local slots = {[16] = "Main Hand", [17] = "Off Hand", [18] = "Thrown"}
			GameTooltip:AddLine(slots[slot])
    		GameTooltip:AddLine(" ")
    		GameTooltip:AddSpellByID(button.spellId)
    	else
    		GameTooltip:SetInventoryItem(unit, slot)
    	end
	end
end

-- creates a icon + statusbar bar
function kbf:ConstructBar(frame, r, g, b)
    local texture = "Interface\\TargetingFrame\\UI-StatusBar"
    -- Because of secureframe suckiness, these height & width numbers
    -- have to be consistent with the stuff in KBF.xml
    local height = self.staticConfig.BAR_HEIGHT
    local width = self.staticConfig.BAR_WIDTH -- this is the width *without* the icon
    local font, _, style = GameFontHighlight:GetFont()
    local r = r or 0
    local g = g or 1
    local b = b or 0
    local bgcolor = {r, g, b, 0.5}
    local color = {r, g, b, 1}
    local fontsize = 11
    local timertextwidth = fontsize * 3.6
    local textcolor = {1, 1, 1, 1}
    local timertextcolor = {1, 1, 1, 1}
    if not frame then
        frame = CreateFrame("Button", nil, UIParent) -- the "top level" frame that represents the bar as a whole
        frame:SetHeight(height)
        frame:SetWidth(width + height)
    end
    local bar = frame
    bar.icon = CreateFrame("Button", nil, bar) -- the icon
    bar.statusbarbg = CreateFrame("StatusBar", nil, bar) -- the bars background
    bar.statusbar = CreateFrame("StatusBar", nil, bar) -- and the bars foreground
    bar.text = bar.statusbar:CreateFontString(nil, "OVERLAY") -- the label text
    bar.timertext = bar.statusbar:CreateFontString(nil, "OVERLAY") -- and the timer text

    -- the icon
    bar.icon:ClearAllPoints()
    bar.icon:SetPoint("LEFT", bar, "LEFT", 0, 0)
    -- icons are square
    bar.icon:SetWidth(height)
    bar.icon:SetHeight(height)
    --bar.icon:EnableMouse(false)
    -- the status bar background & foreground
    local function setupStatusBar(sb, color)
        sb:ClearAllPoints()
        sb:SetHeight(height)
        sb:SetWidth(width)
        -- offset the height of the frame on the x-axis for the icon.
        sb:SetPoint("TOPLEFT", bar, "TOPLEFT", height, 0)
        sb:SetStatusBarTexture(texture)
        sb:GetStatusBarTexture():SetVertTile(false)
        sb:GetStatusBarTexture():SetHorizTile(false)
        sb:SetStatusBarColor(unpack(color))
        sb:SetMinMaxValues(0,1)
        sb:SetValue(1)
    end
    setupStatusBar(bar.statusbarbg, bgcolor)
    setupStatusBar(bar.statusbar, color)
    bar.statusbarbg:SetFrameLevel(bar.statusbarbg:GetFrameLevel()-1) -- make sure the bg frame stays in the back
    -- timer text
    bar.timertext:SetFontObject(GameFontHighlight)
    bar.timertext:SetFont(GameFontHighlight:GetFont())
    bar.timertext:SetHeight(height)
    bar.timertext:SetWidth(timertextwidth)
    bar.timertext:SetPoint("LEFT", bar.statusbar, "LEFT", 2, 0)
    bar.timertext:SetJustifyH("LEFT")
    bar.timertext:SetText("time")
    bar.timertext:SetTextColor(timertextcolor[1], timertextcolor[2], timertextcolor[3], timertextcolor[4])

    -- and the label text
    bar.text:SetFontObject(GameFontHighlight)
    bar.text:SetFont(GameFontHighlight:GetFont())
    bar.text:SetHeight(height)
    bar.text:SetPoint("LEFT", bar.timertext, "RIGHT", 0, 0)
    bar.text:SetPoint("RIGHT", bar.statusbar, "RIGHT", 0, 0)
    bar.text:SetJustifyH("LEFT")
    bar.text:SetText("text")
    bar.text:SetTextColor(textcolor[1], textcolor[2], textcolor[3], textcolor[4])
    return bar
end

function kbf:CreateCoreFrames()
	-- this is the visible anchor frame that the user interacts with 
	-- to move the buffs around
	local height = self.staticConfig.BAR_HEIGHT
    local width = self.staticConfig.BAR_WIDTH -- this is the width *without* the icon
    local anchor = CreateFrame("FRAME", "KBFAnchorFrame", UIParent)
    anchor:SetClampedToScreen(true)
    anchor:SetBackdrop({bgFile = "Interface/Tooltips/UI-Tooltip-Background", 
                         edgeFile = "Interface/Tooltips/UI-Tooltip-Border", 
                         tile = true, tileSize = height, edgeSize = 12,
                         insets = { left = 4, right = 4, top = 4, bottom = 4 },
                         })
    local text = anchor:CreateFontString(nil, "OVERLAY") -- the label text
    text:SetFontObject(GameFontHighlight)
    text:SetFont(GameFontHighlight:GetFont())
    text:SetPoint("TOPLEFT", anchor, "TOPLEFT", 0, 0)
    text:SetPoint("BOTTOMRIGHT", anchor, "BOTTOMRIGHT", 0, 0)
    text:SetText("KBF ANCHOR")
    anchor:SetWidth(height + width)
    anchor:SetHeight(height)
    -- movability
    anchor:EnableMouse(true)
    anchor:SetMovable(true)
    anchor:RegisterForDrag("LeftButton")
    anchor:SetScript("OnDragStart", anchor.StartMoving)
    anchor:SetScript("OnDragStop",  anchor.StopMovingOrSizing)
    anchor:ClearAllPoints()
    anchor:SetPoint("TOPRIGHT", UIParent, "TOPRIGHT", 0, 0)
    anchor:Hide()
    -- this is the parent & host for the secure aura buttons. 
    
	local secureHeader = CreateFrame("FRAME", "KBFBuffFrame", UIParent, "SecureAuraHeaderTemplate")
	self:SetCommonSecureHeaderAttributes(secureHeader)
	if self.db.profile.consolidateBuffs then
	    secureHeader:SetAttribute("consolidateTo", 99)
	end
    secureHeader:SetPoint("TOP", anchor, "TOP", 0, 0)
    
    -- this is the "button" in the aura flow that represents the consolidated buffs.
    -- pre-creating it here in order to perform customization
    local consolidateProxy = CreateFrame("BUTTON", nil, UIParent, "SecureHandlerClickTemplate")
    consolidateProxy:SetNormalTexture("Interface\\TargetingFrame\\UI-StatusBar")
    consolidateProxy:SetWidth(200 +16)
	consolidateProxy:SetHeight(16)
    secureHeader:SetAttribute("consolidateProxy", consolidateProxy)
    --secureHeader:SetFrameRef("proxy", consolidateProxy)

    
    -- this is the equivilent of the secureHeader for the consolidated buffs
    -- pre-creating again, so we can customize/size/position it
    local consolidateHeader = CreateFrame("FRAME", "KBFConsolidatedAnchorFrame", consolidateProxy)
    self:SetCommonSecureHeaderAttributes(consolidateHeader)
    secureHeader:SetAttribute("consolidateHeader", consolidateHeader)
	consolidateProxy:SetAttribute("header", consolidateHeader);
	consolidateProxy:SetFrameRef("header", consolidateHeader)
	
	consolidateProxy:SetAttribute("_onclick", [[
    	local frame = self:GetFrameRef("header")
    	if frame:IsShown() then frame:Hide() else frame:Show() end
    ]])
    consolidateProxy:EnableMouse(true)
    consolidateProxy:RegisterForClicks("AnyUp")
	
	-- position it relative to the proxy, so it can appear where we want it
    consolidateHeader:SetPoint("TOPRIGHT", anchor, "TOPLEFT", 0, 0)
	consolidateHeader:SetWidth(height + width)
	consolidateHeader:SetHeight(height)
	consolidateHeader:Show()
	
    return anchor, secureHeader, consolidateHeader, consolidateProxy
end

--- sets the attributes needed by all the headers
function kbf:SetCommonSecureHeaderAttributes(frame)
    frame:SetAttribute("filter", "HELPFUL")
    frame:SetAttribute("toggleForVehicle", true) -- this doesn't actually work right now, but maybe it eventually will
    frame:SetAttribute("template", "KBFSecureUnitAuraTemplate")
    frame:SetAttribute("point", "TOP")
    frame:SetAttribute("wrapAfter", 100) -- required due to bugs in secure header
    frame:SetAttribute("xOffset", 0)
    frame:SetAttribute("yOffset", -16)
    frame:SetAttribute("minWidth",  216)
    frame:SetAttribute("minHeight", 16)
    frame:SetAttribute("unit", "player")
    frame:SetAttribute("sortMethod", "NAME")
    frame:SetAttribute("sortOrder", "-")
    
    frame:SetAttribute("weaponTemplate", "KBFSecureUnitAuraTemplate")
    -- TODO: Enabling temp enchant support breaks layout for regular buffs
    frame:SetAttribute("includeWeapons", nil)
    frame:Show() -- has to be shown, otherwise the child frames don't show
    return frame
end

function kbf:ShowAnchor()
    self.secureHeader:ClearAllPoints()
    self.secureHeader:SetPoint("TOP", self.anchor, "BOTTOM", 0, 0)
    self.anchor:Show()
end

function kbf:HideAnchor()
    self.secureHeader:ClearAllPoints()
    self.secureHeader:SetPoint("TOP", self.anchor, "TOP", 0, 0)
    self.anchor:Hide()
end

function kbf:ToggleAnchor()
    if self.anchor:IsShown() then
        self:HideAnchor()
    else
        self:ShowAnchor()
    end
end