local U = require "scriptbank\\utillib"

-- Simple script to work with BOD's buttons
-- Look at button and click LMB to press it, global variable
-- will have name of button pressed.
g_buttonPressed = ''

local buttons = {}
local rad = math.rad
local sin = math.sin
local cos = math.cos

g_FingerSprite = g_FingerSprite or nil

function button_init_name(e, name)
	Include("utillib.lua")
	buttons[e] = {name = name}
	
	if g_FingerSprite == nil then
		g_FingerSprite = CreateSprite(LoadImage ( "scriptbank\\images\\finger.png"))
		SetSpriteOffset(g_FingerSprite, -1 , 5)
		SetSpriteSize  (g_FingerSprite, -1 , 10)
		SetSpriteDepth (g_FingerSprite, 0)
		SetSpritePosition (g_FingerSprite,  200, 200)
	end
end

local downFrame = 18  -- button 'down' frame
local upFrame   = 1   -- button 'up' frame
local butDelay  = 30  -- milliseconds between frames
local chckDelay = 100 -- milliseconds between checks for player looking at button

local fingerShowing = nil 

function button_main(e)

	thisButton = buttons[e]

	if thisButton == nil then return end
	
	if thisButton.frame == nil then
		-- first time initialisation
		-- set button 'up', i.e. first frame
		thisButton.frame = 1
		SetAnimationFrame(e, thisButton.frame)
		
		-- set button state to 'up'
		thisButton.state = 'up'
		
		-- get object id of button
		thisButton.obj = g_Entity[e].obj
		
		-- set delay timer 
		thisButton.timer = g_Time + chckDelay
		
		-- mouse flag
		thisButton.mousePressed = false

	elseif g_Time > thisButton.timer then
		
		if U.PlayerLookingNear( e, 100, 10 ) then
		
			if fingerShowing ~= e then
				fingerShowing = e
				SetSpritePosition (g_FingerSprite, 50, 45)
			end
			if g_MouseClick == 1 then
				if not thisButton.mousePressed then 
					thisButton.mousePressed = true
					thisButton.state = 'down'
					thisButton.timer = g_Time + butDelay
				end
			elseif thisButton.mousePressed then
				thisButton.mousePressed = false
				thisButton.state = 'up'
				thisButton.timer = g_Time + butDelay
			else
				thisButton.timer = g_Time + chckDelay
			end
			
		elseif fingerShowing == e then
		
			SetSpritePosition (g_FingerSprite,  200, 200)
			fingerShowing = nil
		end
		
		if fingerShowing ~= e then
			if thisButton.mousePressed then
				thisButton.mousePressed = false
				thisButton.state = 'up'
				thisButton.timer = g_Time + butDelay
			else
				thisButton.timer = g_Time + chckDelay
			end
		end
		
		-- animate button
		if thisButton.state == 'down' then 
			if thisButton.frame < downFrame then
				thisButton.frame = thisButton.frame + 1
				SetAnimationFrame(e, thisButton.frame)
				thisButton.timer = g_Time + butDelay
				return
			elseif g_buttonPressed ~= thisButton.name then
				g_buttonPressed = thisButton.name
			end
		else
			if thisButton.frame > upFrame then
				thisButton.frame = thisButton.frame - 1
				SetAnimationFrame(e, thisButton.frame)
				thisButton.timer = g_Time + butDelay
				return
			elseif g_buttonPressed == thisButton.name then
				g_buttonPressed = ''
			end
		end		
		thisButton.timer = g_Time + chckDelay
	end
end