--
-- This file adds function to complete the mobs_redo api
--

-- Translator
local S = mobs.translator

local modname = minetest.get_current_modname()
local modpath = minetest.get_modpath(modname)
local vlog = mobs.vlog or "action" --"info"
local vlog = "action" --"info"
local cooldown_mult = 9

if not mobs.npcs then mobs.npcs = {} end
if not mobs.npcs.messages then mobs.npcs.messages = {} end
if not mobs.npcs.messages.random then mobs.npcs.messages.random = {} end

---------------------------------------------------------------------------------------------
-- turn towards the player and stand
-- (based on function from mobf_trader)
---------------------------------------------------------------------------------------------

function get_face_direction(v1, v2)
	if v1 and v2 then
		if v1.x and v2.x and v1.z and v2.z then
			local dx = v1.x - v2.x
			local dz = v2.z - v1.z
			return math.atan2(dx, dz)
		end
	end
end

mobs.npcs.turn_to_player = function( self, player )
	-- Stand sill and pretend to listen
	self.timer = 0
	self.object:setvelocity({x = 0, y = 0, z = 0})
	self.state = "stand"
	mobs:set_animation(self, "stand")

	-- Turn to player
	if( self.object and self.object.setyaw ) then
		self.object:setyaw( get_face_direction( self.object:getpos(), player:getpos() ));
	end
end


string.lines_to_table = function(s)
	if not s then s = '' end
    local t = {}
    local n = 1
    for line in s:gmatch("[^\r\n]+") do
        t[n] = line
        n = n + 1
	end
    return t
end


mobs.npcs.get_textures_array = function(prefix,modfrom)

    local n = 0
    local tn, tf, fp
    local tx = {}

    while true do
        tn = prefix .. n .. ".png"
        tf = minetest.get_modpath(modname) .. "/textures/".. tn
        fp = io.open(tf)
        if not fp then break end
        fp:close()
        tx[#tx+1]={tn}
        n = n + 1
    end

    if #tx > 0 then return tx end
end

mobs.npcs.get_mobname = function(self,generic)
    local mobname = generic or 'npc'
    if self and self._mobname and self._mobname ~= '' then 
       return self._mobname
    end
    return mobname
end

mobs.npcs.send_chat_message = function(playername,msg,mobname)
    if not mobname then mobname = 'npc' end 
    if not msg then msg = "" end
    return minetest.chat_send_player(playername,'<'..mobname..'> '..msg)
end

mobs.npcs.random_message_on_rightclick = function(self,player,data)

	-- Get mob name
	local mobname = mobs.npcs.get_mobname(self)
	-- Get player name
	local playername = player:get_player_name()

	-- Say smething
	local msg = mobs.npcs.messages.get_random()
	mobs.npcs.send_chat_message(playername,msg,mobname)
end


mobs.npcs.message_on_rightclick = function(self,player,data,varname)
	-- Get things to say
	local str = ""
	if not data then data = {} end
	if not varname then varname = 'message' end
	if data.action then
		-- print(dump(data))
		-- print(dump(varname))
		-- print(data.action[varname])
		str = data.action[varname] or "bof"
	end
	-- Get mobname
	local mobname = mobs.npcs.get_mobname(self)
	-- Get player name
	local playername = player:get_player_name()
	-- Say something
	local msg = mobs.npcs.messages.get_random_from_string(str)
	mobs.npcs.send_chat_message(playername,msg,mobname)
end

local function heal_loop(player,hp_max,c)

	local hp = player:get_hp()	
	local hp = hp + 1
	if hp > hp_max then hp = hp_max end	
	-- Set new hp
	player:set_hp(hp)

	-- Start couning in case to avoid endless loop in case the player is hurting while healing...
	if not c then
		c = 1 
	else
		c = c+1
	end
	
	-- Start again if health is not maxed
	-- And loop as not reached its limit (30)
	if ( c <= 30 ) and ( hp < hp_max ) then
		minetest.after(1,heal_loop,player,hp_max,c)
	end
	-- Return diff between hp and hp_max
	return hp_max - hp
end

mobs.npcs.heal_on_rightclick = function(self,player,data)
	if self._cooldown and self._cooldown > 0 then
		mobs.npcs.message_on_rightclick(self,player,data,'message_cooldown')
		return
	end
	-- Get current HP and HP_MAX
	-- local hp = player:get_hp()	
	local hp_max = player:get_properties().hp_max

	-- Send message and start healing
	mobs.npcs.message_on_rightclick(self,player,data,'message_heal')
	dmg = heal_loop(player,hp_max)
	
	-- TODO: Add some effects 
	
	self._cooldown = cooldown_mult * dmg
	-- Then rest for some time, depending on how much damage were healed
	minetest.log(vlog, '['..modname..'] '..'Player '.. player:get_player_name() .. ' was healed by NPC mob at '.. minetest.pos_to_string(player:get_pos()).. '. Cooldown was set to '..self._cooldown..'.'  )
end


-- Register messages
-- Input must be either a string or a table of indexed values
-- Non-indexed values in tables will be ignored
mobs.npcs.messages.register_random = function(var)
	local t
	if type(var) == "table" then
		t = var
	elseif type(var) == "string" then
		t = string.lines_to_table(var)
	else
		return false
	end
	local glob = mobs.npcs.messages.random
	for _,v in ipairs(t) do
		glob[#glob+1]= v
	end
	mobs.npcs.messages.random = glob
	return true
end




-- Define langage (code from intllib mod)
local LANG = minetest.settings:get("language")
if not (LANG and (LANG ~= "")) then LANG = os.getenv("LANG") end
if not (LANG and (LANG ~= "")) then LANG = "en" end
LANG = LANG:sub(1, 2)

-- Reused from mod random_messages
mobs.npcs.messages.get_list_from_file = function(basename)
	if not basename then return end
    local line_number = 1
	local messages = {}
	
	-- Look into the world folder first
	local input = io.open(minetest.get_worldpath()..'/'..basename..'.txt',"r")
	
    -- If it fails, try looking elswhere
	if not input then
		
        -- Localized default file in the mod folder
		local default_input = io.open(minetest.get_modpath(modname)..'/'..basename..'.'..LANG..'.txt',"r")
		local output = io.open(minetest.get_worldpath()..'/'..basename..'.txt',"w")
		if not default_input then
			-- localised file not found, look for a generic default file in the mod folder
			default_input = io.open(minetest.get_modpath(modname)..'/'..basename..'.txt',"r")
		end
        
		if not default_input then
			-- Now we're out of options, blame the admin
			-- output:write("Blame the server admin! He/She has probably not edited the random messages yet.\n")
			-- output:write("Tell your dumb admin that this line is in (worldpath)/random_messages \n")
			-- As fun a the above would be, using default files or leaving this the output empty is now more convenient
			minetest.log(vlog, '['..modname..'] '..'No input message file found for "'..basename.. '"... ignoring. Place a file named '.. basename .. '.txt' .. ' in world directory to add messages to the random messages list.'  )
			
		else
			-- or write default_input content in worldpath message file
			minetest.log(vlog, '['..modname..'] '..'No input message file found for "'..basename.. '"... updating world folder data' )
			local content = default_input:read("*all")
			output:write(content)
		end
		io.close(output)

		if default_input then io.close(default_input) end
		input = io.open(minetest.get_worldpath()..'/'..basename..'.txt',"r")

	end

	-- we should have input by now, so lets read it
	for line in input:lines() do
		messages[line_number] = line
		line_number = line_number + 1
	end
	-- close it
	io.close(input)
	return messages
end

-- Fill messages array when server start.
--
local default_messages_file_name = "mobs_npc_messages"

local messages_default = mobs.npcs.messages.get_list_from_file("mobs_npc_messages")
local messages_extra = mobs.npcs.messages.get_list_from_file("mobs_npc_messages_extra")

mobs.npcs.messages.register_random(messages_default)
mobs.npcs.messages.register_random(messages_extra)



function table.count( t )
	local i = 0
	for k in pairs( t ) do i = i + 1 end
	return i
end

function table.random( t )
	local rk = math.random( 1, table.count( t ) )
	local i = 1
	for k, v in pairs( t ) do
		if ( i == rk ) then return v, k end
		i = i + 1
	end
end

mobs.npcs.messages.get_random = function()
	return table.random(mobs.npcs.messages.random)
end

mobs.npcs.messages.get_random_from_string = function(str)
	local arr = string.lines_to_table(str)
	return table.random(arr)
end