--[[
| This file was obtained through the combined efforts
| of Madbluntz & Plymouth Antiquarian Society.
|
| Credits: lifestorm, Gregory Wayne Rossel JR.,
| 	Maloy, DrPepper10 @ RIP, Atle!
|
| Visit for more: https://plymouth.thetwilightzone.ru/
--]]


--[[---------------------------------------------------------
	Name: scripted_ents
	Desc: Scripted Entity factory
-----------------------------------------------------------]]

module( "scripted_ents", package.seeall )

local Aliases = {}
local SEntList = {}

local BaseClasses = {}
BaseClasses[ "anim" ] = "base_anim"
BaseClasses[ "point" ] = "base_point"
BaseClasses[ "brush" ] = "base_brush"
BaseClasses[ "filter" ] = "base_filter"

--[[---------------------------------------------------------
	Name: TableInherit( t, base )
	Desc: Copies any missing data from base to t
-----------------------------------------------------------]]
local function TableInherit( t, base )

	for k, v in pairs( base ) do

		if ( t[ k ] == nil ) then
			t[ k ] = v
		elseif ( k != "BaseClass" && istable( t[ k ] ) && istable( v ) ) then
			TableInherit( t[ k ], v )
		end

	end

	t[ "BaseClass" ] = base

	return t

end

--[[---------------------------------------------------------
	Name: IsBasedOn( name, base )
	Desc: Checks if name is based on base
-----------------------------------------------------------]]
function IsBasedOn( name, base )
	local t = GetStored( name )
	if not t then return false end
	if t.Base == name then return false end

	if t.Base == base then return true end
	return IsBasedOn( t.Base, base )
end

function Register( t, name )

	if ( hook.Run( "PreRegisterSENT", t, name ) == false ) then return end

	if ( isstring( t.ClassNameOverride ) ) then name = t.ClassNameOverride end

	local Base = t.Base
	if ( !Base ) then Base = BaseClasses[ t.Type ] end

	local old = SEntList[ name ]
	local tab = {}

	tab.type		= t.Type
	tab.t			= t
	tab.isBaseType	= true
	tab.Base		= Base
	tab.t.ClassName	= name

	if ( !Base ) then
		Msg( "WARNING: Scripted entity " .. name .. " has an invalid base entity!\n" )
	end

	SEntList[ name ] = tab

	-- Allow all SENTS to be duplicated, unless specified
	if ( !t.DisableDuplicator ) then
		duplicator.Allow( name )
	end

	--
	-- If we're reloading this entity class
	-- then refresh all the existing entities.
	--
	if ( old != nil ) then

		--
		-- For each entity using this class
		--
		for _, entity in ipairs( ents.FindByClass( name ) ) do

			--
			-- Replace the contents with this entity table
			--
			table.Merge( entity, tab.t )

			--
			-- Call OnReloaded hook (if it has one)
			--
			if ( entity.OnReloaded ) then
				entity:OnReloaded()
			end

		end

		-- Update entity table of entities that are based on this entity
		for _, e in ipairs( ents.GetAll() ) do
			if ( IsBasedOn( e:GetClass(), name ) ) then

				table.Merge( e, Get( e:GetClass() ) )

				if ( e.OnReloaded ) then
					e:OnReloaded()
				end
			end
		end

	end

	if ( !t.Spawnable ) then return end

	list.Set( "SpawnableEntities", name, {
		-- Required information
		PrintName		= t.PrintName,
		ClassName		= name,
		Category		= t.Category,

		-- Optional information
		NormalOffset	= t.NormalOffset,
		DropToFloor		= t.DropToFloor,
		Author			= t.Author,
		AdminOnly		= t.AdminOnly,
		Information		= t.Information,
		ScriptedEntityType = t.ScriptedEntityType,
		IconOverride	= t.IconOverride
	} )

end

--
-- All scripts have been loaded...
--
function OnLoaded()

	--
	-- Once all the scripts are loaded we can set up the baseclass
	-- - we have to wait until they're all setup because load order
	-- could cause some entities to load before their bases!
	--
	for k, v in pairs( SEntList ) do

		baseclass.Set( k, Get( k ) )

	end

end

function Get( name, retval )

	-- Do we have an alias?
	if ( Aliases[ name ] ) then
		name = Aliases[ name ]
	end

	if ( SEntList[ name ] == nil ) then return nil end

	-- Create/copy a new table
	local retval = retval or {}
	for k, v in pairs( SEntList[ name ].t ) do
		if ( istable( v ) ) then
			retval[ k ] = table.Copy( v )
		else
			retval[ k ] = v
		end
	end

	-- Derive from base class
	if ( SEntList[ name ].Base != name ) then

		local base = Get( SEntList[ name ].Base )

		if ( !base ) then
			Msg("ERROR: Trying to derive entity " .. tostring( name ) .. " from non existant entity " .. tostring( SEntList[ name ].Base ) .. "!\n" )
		else
			retval = TableInherit( retval, base )
		end

	end

	return retval

end

function GetType( name )

	for k, v in pairs( BaseClasses ) do
		if ( name == v ) then return k end
	end

	local ent = SEntList[ name ]
	if ( ent == nil ) then return nil end

	if ( ent.type ) then
		return ent.type
	end

	if ( ent.Base ) then
		return GetType( ent.Base )
	end

	return nil

end

--[[---------------------------------------------------------
	Name: GetStored( string )
	Desc: Gets the REAL sent table, not a copy
-----------------------------------------------------------]]
function GetStored( name )
	return SEntList[ name ]
end

--[[---------------------------------------------------------
	Name: GetList( string )
	Desc: Get a list of all the registered SENTs
-----------------------------------------------------------]]
function GetList()
	local result = {}

	for k,v in pairs( SEntList ) do
		result[ k ] = v
	end

	return result
end

function GetSpawnable()

	local result = {}

	for k, v in pairs( SEntList ) do

		local tab = v.t

		if ( tab.Spawnable ) then
			table.insert( result, tab )
		end

	end

	return result

end

function Alias( From, To )

	Aliases[ From ] = To

end

function GetMember( entity_name, membername )

	if ( !entity_name ) then return end

	local ent = SEntList[ entity_name ]

	if ( !ent ) then return end

	local member = ent.t[ membername ]
	if ( member != nil ) then return member end

	-- If our base is the same as us - don't infinite loop!
	if ( entity_name == ent.Base ) then return end

	return GetMember( ent.Base, membername )

end