Dialog = { }

-- defines for the requirement types
REQ_RACE							= 1
REQ_CLASS							= 2
REQ_LEVEL							= 3
REQ_LEVEL_GREATER_OR_EQUAL			= 4
REQ_LEVEL_LESS_OR_EQUAL				= 5
REQ_QUEST_ELIGIBLE					= 6
REQ_QUEST_ON_STEP					= 7
REQ_QUEST_BEFORE_STEP				= 8
REQ_QUEST_PAST_STEP					= 9
REQ_QUEST_HAS_QUEST					= 10
REQ_QUEST_DOESNT_HAVE_QUEST			= 11
REQ_QUEST_NOT_ON_STEP				= 12
REQ_QUEST_HAS_COMPLETED_QUEST		= 13
REQ_QUEST_NOT_HAS_COMPLETED_QUEST	= 14
REQ_TEMP_VAR_NOT_SET				= 15
REQ_TEMP_VAR_SET					= 16
REQ_LUA_HISTORY_SET					= 17
REQ_LUA_HISTORY_NOT_SET				= 18
REQ_LOCATION_ID						= 19
REQ_TSLEVEL							= 20
REQ_TSLEVEL_GREATER_OR_EQUAL		= 21
REQ_TSLEVEL_LESS_OR_EQUAL			= 22



-- Dialog variables
Dialog.NPC = nil
Dialog.Player = nil
Dialog.Dialog = {}

-- private functions go at the top

-- Checks the requirement table and returns false if the player failed a check or true if they pass ALL checks
local function CheckRequirements(reqs)
	local ret = true
	
	-- if no requirements then return true
	if reqs ~= nil then
		-- loop through the requirements and check to see if the player fails them, if so set the return value 
		-- to false and break the loop as we don't need to check any of the other requirements
		for k, v in pairs(reqs) do
			if v.Type == REQ_RACE  and GetRace(Dialog.Player) ~= v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_CLASS and GetClass(Dialog.Player) ~= v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_LEVEL and GetLevel(Dialog.Player) ~= v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_LEVEL_GREATER_OR_EQUAL and GetLevel(Dialog.Player) < v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_LEVEL_LESS_OR_EQUAL and GetLevel(Dialog.Player) > v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_QUEST_ELIGIBLE and not CanReceiveQuest(Dialog.Player, v.Value1) then
				ret = false
				break
			elseif v.Type == REQ_QUEST_ON_STEP and GetQuestStep(Dialog.Player, v.Value1) ~= v.Value2 then
				ret = false
				break
			elseif v.Type == REQ_QUEST_BEFORE_STEP and GetQuestStep(Dialog.Player, v.Value1) >= v.Value2 then
				ret = false
				break
			elseif v.Type == REQ_QUEST_PAST_STEP and GetQuestStep(Dialog.Player, v.Value1) <= v.Value2 then
				ret = false
				break
			elseif v.Type == REQ_QUEST_HAS_QUEST and not HasQuest(Dialog.Player, v.Value1) then
				ret = false
				break
			elseif v.Type == REQ_QUEST_DOESNT_HAVE_QUEST and HasQuest(Dialog.Player, v.Value1) then
				ret = false
				break
			elseif v.Type == REQ_QUEST_NOT_ON_STEP and GetQuestStep(Dialog.Player, v.Value1) == v.Value2 then
				ret = false
				break
			elseif v.Type == REQ_QUEST_HAS_COMPLETED_QUEST and not HasCompletedQuest(Dialog.Player, v.Value1) then
				ret = false
				break
			elseif v.Type == REQ_QUEST_NOT_HAS_COMPLETED_QUEST and HasCompletedQuest(Dialog.Player, v.Value1) then
				ret = false
				break
			elseif v.Type == REQ_TEMP_VAR_NOT_SET and GetTempVariable(Dialog.Player, v.Value1) == v.Value2 then
				ret = false
				break
			elseif v.Type == REQ_TEMP_VAR_SET and GetTempVariable(Dialog.Player, v.Value1) ~= v.Value2 then
				ret = false
				break
			elseif v.Type == REQ_LUA_HISTORY_SET then
				local value1, value2 = GetPlayerHistory(Dialog.Player, v.Value1)
				if v.Value2 ~= value1 then
					ret = false
					break
				elseif v.Value3 ~= nil and v.Value3 ~= value2 then
					ret = false
					break
				end
			elseif v.Type == REQ_LUA_HISTORY_NOT_SET then
				local value1, value2 = GetPlayerHistory(Dialog.Player, v.Value1)
				if v.Value2 == value1 then
					ret = false
					break
				elseif v.Value3 ~= nil and v.Value3 == value2 then
					ret = false
					break
				end
			elseif v.Type == REQ_LOCATION_ID and GetSpawnLocationID(Dialog.NPC) ~= v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_TSLEVEL and GetTradeskillLevel(Dialog.Player) ~= v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_TSLEVEL_GREATER_OR_EQUAL and GetTradeskillLevel(Dialog.Player) < v.Value1 then
				ret = false
				break
			elseif v.Type == REQ_TSLEVEL_LESS_OR_EQUAL and GetTradeskillLevel(Dialog.Player) > v.Value1 then
				ret = false
				break
			end
		end
	end
	
	return ret
end

-- Helper function to check requirements on options and actually use the option
local function PrintOptions(dlg, con)
	-- loop through the options and check their requirements, if they pass add the option
	for k, v in pairs(dlg.Options) do
		if CheckRequirements(v.Requirements) == true then
			AddConversationOption(con, v.option, v.callback)
			ret=true
		end
	end
	return ret
end

-- Actual member functions are below, these are what you call in the other scripts

-- Set up the spawn pointers to use
function Dialog.New(NPC, Player)
	Dialog.NPC = NPC
	Dialog.Player = Player
end

-- Test function, left it in for now as it may be useful but it is just a Say()
function Dialog.Test(Msg)
	if Dialog.NPC ~= nil then
		Say(Dialog.NPC, Msg)
	end
end

-- Add a dialog
function Dialog.AddDialog(text)
	local dlg = {}
	dlg.Text = text
	dlg.Options = {}
	dlg.Requirements = nil
	dlg.VOFile = nil
	dlg.VOKey1 = nil
	dlg.VOKey2 = nil
	dlg.Emote = nil
	table.insert(Dialog.Dialog, dlg)
end

-- Adds requirements to the last added dialog
function Dialog.AddRequirement(req_type, value1, value2, value3)
	local dlg = Dialog.Dialog[#Dialog.Dialog]
	if dlg.Requirements == nil then
		dlg.Requirements = {}
	end
	local req = {}
	req.Type = req_type
	req.Value1 = value1
	req.Value2 = value2
	req.Value3 = value3
	table.insert(dlg.Requirements, req)
end

-- Adds a voiceover to the last added dialog
function Dialog.AddVoiceover(file, key1, key2)
	local dlg = Dialog.Dialog[#Dialog.Dialog]
	dlg.VOFile = file
	dlg.VOKey1 = key1
	dlg.VOKey2 = key2
end

-- Adds an emote to the last added dialog
function Dialog.AddEmote(emote)
	local dlg = Dialog.Dialog[#Dialog.Dialog]
	dlg.Emote = emote
end

-- Adds options to the last added dialog
function Dialog.AddOption(opt, cb)
	local dlg = Dialog.Dialog[#Dialog.Dialog]
	local option = {}
	option.option = opt
	option.callback = cb
	option.Requirements = nil
	table.insert(dlg.Options, option)
end

-- Adds requirements to the last added option
function Dialog.AddOptionRequirement(req_type, value1, value2, value3)
	local dlg = Dialog.Dialog[#Dialog.Dialog]
	local option = dlg.Options[#dlg.Options]
	if option.Requirements == nil then
		option.Requirements = {}
	end
	local req = {}
	req.Type = req_type
	req.Value1 = value1
	req.Value2 = value2
	req.Value3 = value3
	table.insert(option.Requirements, req)
end

-- Actually sends the dialog to the player
function Dialog.Start()
	-- if NPC or Player are nil then return out so we don't cause a null pointer error on the server
	if Dialog.NPC == nil or Dialog.Player == nil then
		-- would be great to print a lua error here
		return
	end
	
	-- create the conversation
	local con = CreateConversation()
	
	-- bool to see if we found a dialog to send
	local found = false
	
	-- loop through all the dialogs
	for key, dlg in pairs(Dialog.Dialog) do
		-- Check the dialog requirements if there are any and set the found bool
		if dlg.Requirements ~= nil then
			found = CheckRequirements(dlg.Requirements)
		else
			-- no requirements for this dialog so lets use it
			found = true
		end
		
		-- if we found a dialog to use lets set up the options for it and send it
		if found == true then
		    HadOptions =  PrintOptions(dlg, con)
			Say(Dialog.NPC,"found true")
			if dlg.Emote ~= nil then
				Say(Dialog.NPC,"Emote true")
				if HadOptions == true then
					StartConversation(con, Dialog.NPC, Dialog.Player, dlg.Text)
				else
					Say(Dialog.NPC,dlg.Text)
				end
				if dlg.VOFile ~= nil then
					Say(Dialog.NPC,"emote true VO true ")
				    PlayFlavor(Dialog.NPC, dlg.VOFile, "", dlg.Emote, dlg.VOKey1, dlg.VOKey2, Dialog.Player)
				else
					Say(Dialog.NPC,"emote true VO false ")
				    PlayFlavor(Dialog.NPC, "", "", dlg.Emote, 0, 0, Dialog.Player)
				end
				if HadOptions == true then
					StartConversation(con, Dialog.NPC, Dialog.Player, dlg.Text)
				else
					Say(Dialog.NPC,dlg.Text)
				end
			else
			     
				 if dlg.VOFile ~= nil then
				    if HadOptions == true then
						StartConversation(con, Dialog.NPC, Dialog.Player, dlg.Text, dlg.VOFile, dlg.VOKey1, dlg.VOKey2)
					else
						PlayFlavor(Dialog.NPC, dlg.VOFile, dlg.Text, "", dlg.VOKey1, dlg.VOKey2, Dialog.Player)
					end
				else
				    if HadOptions == true then
						StartConversation(con, Dialog.NPC, Dialog.Player, dlg.Text)
					else 
						Say(Dialog.NPC,dlg.Text)
					end
				end
						
			end
			
			-- we sent a dialog so get out of the loop
			break;
		end
	end
	
	-- clear the list to avoid duplicates
	Dialog.Dialog = {}
end

return Dialog