--[[
	Gatherer Addon for World of Warcraft(tm).
	HUD Plugin Module
	Version: 3.1.13 (<%codename%>)
	Revision: $Id: GatherHUD.lua 854 2009-04-16 06:13:47Z Esamynn $

	License:
	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program(see GPL.txt); if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

	Note:
		This AddOn\'s source code is specifically designed to work with
		World of Warcraft\'s interpreted AddOn system.
		You have an implicit licence to use this AddOn with these facilities
		since that is it\'s designated purpose as per:
		http://www.fsf.org/licensing/licenses/gpl-faq.html#InterpreterIncompat
]]

local Astrolabe = DongleStub(Gatherer.AstrolabeVersion)

local lib = {}
Gatherer_HUD = lib

local private = {
	curNode = 0,
	maxNode = 0,
	nodes = {},
	heat = {},
	gridres = 250,    -- grid units
	elapsed = 0,
}
lib.Private = private

local get = Gatherer.Config.GetSetting

local frame

function lib.Load( self )
	frame = self
	lib.Frame = frame
	frame.me = Gatherer_Hud_Center
	frame.base = Gatherer_Hud_Base
	frame.heat = Gatherer_Hud_Heat

	this:RegisterEvent("PLAYER_ENTER_COMBAT")
	this:RegisterEvent("PLAYER_LEAVE_COMBAT")
end

function lib.ProcessGameEvent( event )
	if event == "PLAYER_ENTER_COMBAT" then
		private.inCombat = 1;
	elseif event == "PLAYER_LEAVE_COMBAT" then
		private.inCombat = nil;
	end
end

function lib.UpdateStruture()
	local tpy = get("plugin.gatherer_hud.radius")/get("plugin.gatherer_hud.yards")

	if not (get("plugin.gatherer_hud.enable") and get("minimap.enable")) or private.hidden then
		frame:Hide()
	else
		frame:Show()
	end

	frame:SetPoint("CENTER", UIParent, "CENTER", get("plugin.gatherer_hud.offset.horizontal"), get("plugin.gatherer_hud.offset.vertical"))
	frame:SetWidth(get("plugin.gatherer_hud.radius")*2)
	frame:SetHeight(get("plugin.gatherer_hud.radius")*2)
	frame:SetAlpha(get("plugin.gatherer_hud.alpha")/100)
	local strata = get("plugin.gatherer_hud.strata")
	if (strata == 1) then
	frame:SetFrameStrata("BACKGROUND")
	elseif (strata == 2) then
	frame:SetFrameStrata("LOW")
	elseif (strata == 3) then
	frame:SetFrameStrata("MEDIUM")
	else
	frame:SetFrameStrata("HIGH")
	end

	frame.me:SetWidth(tpy*132)
	frame.me:SetHeight(tpy*132*(get("plugin.gatherer_hud.aspect")/100))
	if (get("plugin.gatherer_hud.center.enable")) then
		local color = get("plugin.gatherer_hud.center.color")
		local r, g, b, a = strsplit(",", tostring(color) or "0,0,0,1")
		r = tonumber(r) or 0
		g = tonumber(g) or 0
		b = tonumber(b) or 0
		a = tonumber(a) or 0
		frame.me:SetVertexColor(r,g,b,a)
		frame.me:Show()
	else
		frame.me:Hide()
	end

	frame.base:SetWidth(get("plugin.gatherer_hud.radius")*2.2)
	frame.base:SetHeight(get("plugin.gatherer_hud.radius")*2.2*(get("plugin.gatherer_hud.aspect")/100))
	if (get("plugin.gatherer_hud.base.enable")) then
		local color = get("plugin.gatherer_hud.base.color")
		local r, g, b, a = strsplit(",", tostring(color) or "0,0,0,1")
		r = tonumber(r) or 0
		g = tonumber(g) or 0
		b = tonumber(b) or 0
		a = tonumber(a) or 0
		frame.base:SetVertexColor(r,g,b,a)
		frame.base:Show()
	else
		frame.base:Hide()
	end

	if not get("plugin.gatherer_hud.heat.enable") then frame.heat:Hide()
	else frame.heat:Show() end

	local color = get("plugin.gatherer_hud.heat.color")
	local r, g, b, a = strsplit(",", tostring(color) or "0,0,0,1")
	a = tonumber(a) or 0.7 
	frame.heat:SetAlpha(a)

	if (private.started) then
		lib.Render()
	end
end

function lib.BeginUpdate()
	private.curNode = 0
end

function lib.PlaceIcon(n, c, z, x, y)
	local tex, trim = Gatherer.Util.GetNodeTexture(n)

	local nodeId = private.curNode+1
	private.curNode = nodeId

	local node = private.nodes[nodeId]
	if (not node) then
		node = {}
		node.tex = frame:CreateTexture("GatherHudNode"..nodeId)
		node.tex:SetWidth(get("plugin.gatherer_hud.iconsize"))
		node.tex:SetHeight(get("plugin.gatherer_hud.iconsize"))
		node.tex:Show();
		private.nodes[nodeId] = node
		if nodeId > private.maxNode then
			private.maxNode = nodeId
		end
	end

	node.tex:SetTexture(tex)
	node.c = c
	node.z = z
	node.x = x
	node.y = y
end

-- /run LibSwagData.heat = Gatherer_HUD.Private.zoneGrid
-- /run Gatherer_HUD.Private.zoneGrid = LibSwagData.heat
private.zoneGrid = {}
function lib.Render()
	local hide = false
	if not (get("plugin.gatherer_hud.enable") and get("minimap.enable")) then hide=true
	elseif get("plugin.gatherer_hud.hide.flying") and IsFlying() then hide=true
	elseif get("plugin.gatherer_hud.hide.inside") and IsIndoors() then hide=true
	elseif get("plugin.gatherer_hud.hide.mounted") and IsMounted() then hide=true
	elseif get("plugin.gatherer_hud.hide.walking") and not IsMounted() then hide=true
	elseif get("plugin.gatherer_hud.hide.resting") and IsResting() then hide=true
	elseif get("plugin.gatherer_hud.hide.stealth") and IsStealthed() then hide=true
	elseif get("plugin.gatherer_hud.hide.swimming") and IsSwimming() then hide=true
	elseif get("plugin.gatherer_hud.hide.combat") and ( private.inCombat or
	                                    UnitAffectingCombat("target") or
	                                    UnitAffectingCombat("player") or
	                                    UnitAffectingCombat("pet")
	                                  ) then hide=true
	elseif get("plugin.gatherer_hud.hide.target") and ( (UnitCanAttack("target", "player") or
	                                    UnitIsEnemy("target", "player")) and
										not UnitIsDead("target")
	                                  ) then hide=true
	end

	if hide then
		private.hidden = true
		frame:Hide()
		return
	end
	private.hidden = nil
	frame:Show()

	local d, dx, dy, node, pct, angle, facing, newangle, newsize, newalpha
	local pc, pz, px, py = unpack(Astrolabe.LastPlayerPosition);

	local gridres = private.gridres
	local gridressquare = gridres * gridres
	local maxunits = gridressquare + gridres + 1

	if (not private.zoneGrid[pc..pz]) then
		private.zoneGrid[pc..pz] = {}
		local grid = private.zoneGrid[pc..pz]
		for i = 1, maxunits + 1 do
			grid[i] = 0
		end
	end
	-- Add "heat" to current map
	local now = time()
	local grid = private.zoneGrid[pc..pz]
	if not (UnitIsDeadOrGhost("player") or UnitOnTaxi("player")) then
		local zpos = (math.floor(px*gridres) + math.floor(py*gridres)*gridres) + 1
		grid[zpos] = now
	end

	if (private.curNode == 0) then
		frame:Hide()
		return
	elseif (not frame:IsVisible()) then
		frame:Show()
	end

	-- Get the ratio of texcels to yards
	local radius = get("plugin.gatherer_hud.radius")
	local maxYards = get("plugin.gatherer_hud.yards")
	local aspect = get("plugin.gatherer_hud.aspect") / 100
	local reduce = get("plugin.gatherer_hud.reduce") / 100
	local size = get("plugin.gatherer_hud.iconsize")
	local fadeAt = get("plugin.gatherer_hud.fade") / 100
	local ratio = radius / maxYards -- texcels/yard
	
	facing = GetPlayerFacing();
	
	for i = 1, private.curNode do
		node = private.nodes[i]
		-- d/dx/dy = distance in yards in the radius/x/y dimensions
		d, dx, dy = Astrolabe:ComputeDistance(pc, pz, px, py, node.c, node.z, node.x, node.y);

		if d and dx and dy then
			angle = math.atan2(dx, -dy)
			newangle = angle + facing

			dx = d * math.sin(newangle);
			dy = d * math.cos(newangle);

			if (d < maxYards) then
				pct = d/maxYards
				if (pct > fadeAt) then
					-- Fade out to 0 after 95%
					pct = (1-pct)/(1-fadeAt)
				else
					pct = 1
				end
				
				-- Work out the sizes
				local fb = dy/maxYards/2 + 0.5
				newsize = size - size*fb*reduce
				newalpha = pct - pct*(1-fb)*reduce

				-- So now, we need to work out the icon position
				dx = dx * ratio
				dy = dy * ratio * aspect
				
				node.tex:SetAlpha(newalpha)
				node.tex:ClearAllPoints()
				node.tex:SetPoint("CENTER", frame, "CENTER", dx, dy)
				node.tex:SetWidth(newsize)
				node.tex:SetHeight(newsize)
				if not node.tex:IsVisible() then
					node.tex:Show()
				end
			elseif node.tex:IsVisible() then
				node.tex:Hide()
			end
		end
	end
	for i = private.curNode+1, private.maxNode do
		node = private.nodes[i]
		if node.tex:IsVisible() then
			node.tex:Hide()
		end
	end

	local pos = 1
	if (get("plugin.gatherer_hud.heat.enable")) then
		local color = get("plugin.gatherer_hud.heat.color")
		local r, g, b, a = strsplit(",", tostring(color) or "0,0,0,1")
		r = tonumber(r) or 0
		g = tonumber(g) or 0
		b = tonumber(b) or 0

		local _, xScale, yScale = Astrolabe:ComputeDistance(pc, pz, 0,0, pc, pz, 1,1)
		
		local maxExtentX = maxYards/xScale
		local maxExtentY = maxYards/yScale

		local delta, gridTime, percent, gx, gy
		local heatTime = get("plugin.gatherer_hud.heat.cooldown")
		if (get("plugin.gatherer_hud.heat.nevercooldown")) then
			heatTime = 1000000000
		end
		local heatTrailSize = get("plugin.gatherer_hud.heat.size") + 20
		local size = heatTrailSize * ratio
		for i=1, maxunits do
			gridTime = grid[i]
			delta = now - gridTime

			if (delta < heatTime) then
				gx = (i%gridres) / gridres
				gy = (i-gx)/gridressquare
				-- Eliminate as many "not possible" matches as early as we can by working out
				-- the "boxed" area
				if (
					gx > px - maxExtentX and gx < px + maxExtentX and
					gy > py - maxExtentY and gy < py + maxExtentY
				) then
					-- Since we are doing so many computations in this loop, we cannot 
					-- afford to call astrolabe to calculate the distances.
					--d, dx, dy = Astrolabe:ComputeDistance(pc, pz, px, py, pc, pz, gx, gy)
					-- We must do it ourself.
					dx = (gx - px) * xScale
					dy = (gy - py) * yScale
					d = math.sqrt(dx*dx + dy*dy)

					if (d < maxYards) then
						angle = math.atan2(dx, -dy)
						newangle = angle + facing

						dx = d * math.sin(newangle);
						dy = d * math.cos(newangle);

						node = private.heat[pos]
						if not node then
							node = frame.heat:CreateTexture("GatherHudHeat"..pos)
							node:SetTexture("Interface\\AddOns\\Gatherer_HUD\\HudShape")
							private.heat[pos] = node
						end
						node:SetVertexColor(r, g, b)
						pos = pos + 1

						pct = d/maxYards
						if (pct > fadeAt) then
							-- Fade out to 0 after 95%
							pct = (1-pct)/(1-fadeAt)
						else
							pct = 1
						end

						pct = pct * (1 - (delta / heatTime))

						-- Work out the sizes
						local fb = dy/maxYards/2 + 0.5
						newsize = size - size*fb*reduce
						newalpha = pct - pct*(1-fb)*reduce

						-- So now, we need to work out the icon position
						dx = dx * ratio
						dy = dy * ratio * aspect
						
						node:SetAlpha(newalpha)
						node:ClearAllPoints()
						node:SetPoint("CENTER", frame, "CENTER", dx, dy)
						node:SetWidth(newsize)
						node:SetHeight(newsize * aspect)
						if not node:IsVisible() then
							node:Show()
						end
					end
				end
			end
		end
	end

	while private.heat[pos] do
		if private.heat[pos]:IsVisible() then
			private.heat[pos]:Hide()
		end
		pos = pos + 1
	end
			
end


function Gatherer_HUD.RunUpdate(delay)
	private.elapsed = private.elapsed + delay
	local rate = GetFramerate()
	
	if not private.started then
		if private.elapsed < 30 and rate < 5 then return end
		private.started = true
	end
	
	-- Get our update interval dynamically based off frame rate
	if not private.interval then
		private.interval = 1
	end

	local min_fullframerate = get("plugin.gatherer_hud.min_fullframerate")

	local interval = 0
	if rate > min_fullframerate or min_fullframerate == 0 then 
		private.interval = 0
	else
		if     (rate > (min_fullframerate/4)) then interval = rate/2
		elseif (rate > (min_fullframerate/8)) then interval = rate/4
		elseif (rate > (min_fullframerate/12)) then interval = 1
		elseif (rate > (min_fullframerate/16)) then interval = 0.5
		else interval = 0.01 end
		
		private.interval = ((private.interval * 100) + interval) / 101
	end
	
	-- Render if interval is great enough
	if private.interval == 0 or private.elapsed > 1/private.interval then
		private.elapsed = 0
		lib.Render()
	end
end
