--trainhud.lua: holds all the code for train controlling

advtrains.hud = {}
advtrains.hhud = {}

minetest.register_on_leaveplayer(function(player)
advtrains.hud[player:get_player_name()] = nil
advtrains.hhud[player:get_player_name()] = nil
end)

local mletter={[1]="F", [-1]="R", [0]="N"}
local doorstr={[-1]="|<>| >|<", [0]=">|< >|<", [1]=">|< |<>|"}

function advtrains.on_control_change(pc, train, flip)
   	local maxspeed = train.max_speed or 10
	if pc.sneak then
		if pc.up then
			train.tarvelocity = maxspeed
		end
		if pc.down then
			train.tarvelocity = 0
		end
		if pc.left then
			train.tarvelocity = 4
		end
		if pc.right then
			train.tarvelocity = 8
		end
		--[[if pc.jump then
			train.brake = true
			--0: released, 1: brake and pressed, 2: released and brake, 3: pressed and brake
			if not train.brake_hold_state or train.brake_hold_state==0 then
				train.brake_hold_state = 1
			elseif train.brake_hold_state==2 then
				train.brake_hold_state = 3
			end
		elseif train.brake_hold_state==1 then
			train.brake_hold_state = 2
		elseif train.brake_hold_state==3 then
			train.brake = false
			train.brake_hold_state = 0
		end]]
		--shift+use:see wagons.lua
	else
		local act=false
		if pc.jump then
			train.ctrl.user = 1
			act=true
		end
		-- If atc command set, only "Jump" key can clear command. To prevent accidental control.
		if train.tarvelocity or train.atc_command then
			return
		end
		if pc.up then
		   train.ctrl.user=4
		   act=true
		end
		if pc.down then
			if train.velocity>0 then
				if pc.jump then
					train.ctrl.user = 0
				else
					train.ctrl.user = 2
				end
				act=true
			else
				advtrains.invert_train(train.id)
				advtrains.atc.train_reset_command(train)
			end
		end
		if pc.left then
			if train.door_open ~= 0 then
				train.door_open = 0
			else
				train.door_open = -1
			end
		end
		if pc.right then
			if train.door_open ~= 0 then
				train.door_open = 0
			else
				train.door_open = 1
			end
		end
		if not act then
			train.ctrl.user = nil
		end
	end
end
function advtrains.update_driver_hud(pname, train, flip)
	local inside=train.text_inside or ""
	advtrains.set_trainhud(pname, inside.."\n"..advtrains.hud_train_format(train, flip))
end
function advtrains.clear_driver_hud(pname)
	advtrains.set_trainhud(pname, "")
end

function advtrains.set_trainhud(name, text)
	local hud = advtrains.hud[name]
	local player=minetest.get_player_by_name(name)
	if not player then
	   return
	end
	if not hud then
		hud = {}
		advtrains.hud[name] = hud
		hud.id = player:hud_add({
			hud_elem_type = "text",
			name = "ADVTRAINS",
			number = 0xFFFFFF,
			position = {x=0.5, y=0.7},
			offset = {x=0, y=0},
			text = text,
			scale = {x=200, y=60},
			alignment = {x=0, y=0},
		})
		hud.oldText=text
		return
	elseif hud.oldText ~= text then
		player:hud_change(hud.id, "text", text)
		hud.oldText=text
	end
end
function advtrains.set_help_hud(name, text)
	local hud = advtrains.hhud[name]
	local player=minetest.get_player_by_name(name)
	if not player then
	   return
	end
	if not hud then
		hud = {}
		advtrains.hhud[name] = hud
		hud.id = player:hud_add({
			hud_elem_type = "text",
			name = "ADVTRAINS_HELP",
			number = 0xFFFFFF,
			position = {x=1, y=0.3},
			offset = {x=0, y=0},
			text = text,
			scale = {x=200, y=60},
			alignment = {x=1, y=0},
		})
		hud.oldText=text
		return
	elseif hud.oldText ~= text then
		player:hud_change(hud.id, "text", text)
		hud.oldText=text
	end
end

--train.lever:
--Speed control lever in train, for new train control system.
--[[
Value	Disp	Control	Meaning
0		BB		S+Space	Emergency Brake
1		B		Space	Normal Brake
2		-		S		Roll
3		o		<none>	Stay at speed
4		+		W		Accelerate
]]

function advtrains.hud_train_format(train, flip)
	local fct=flip and -1 or 1
	if not train then return "" end
	
	local max = train.max_speed or 10
	local res = train.speed_restriction or max
	local vel = advtrains.abs_ceil(train.velocity)
	local vel_kmh=advtrains.abs_ceil(advtrains.ms_to_kmh(train.velocity))
	
	local levers = "BLua License
-----------

Lua is licensed under the terms of the MIT license reproduced below.
This means that Lua is free software and can be used for both academic
and commercial purposes at absolutely no cost.

For details and rationale, see http://www.lua.org/license.html .

===============================================================================

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Permission is hereby granted, free of charge, to any person obtaining a copy
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in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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====================================