--------------------------------
--                            --
--    Spectre build config    --
--                            --
--------------------------------
Import(".bam/functions.lua")
CheckVersion("0.5")

--------------------------------
--                            --
--      Environment Setup     --
--                            --
--------------------------------

-- OS Detection
TARGET_OS = system()
if TARGET_OS == nil then
	print ("System not supported" )
	print ("Supported systems are: " .. supported_systems() )
	return 1
end

-- paths used when building.
paths = {
	build		= "build",
	object 		= "obj",
	examples 	= "examples"
}

--------------------------------
--                            --
--    Global Build Settings   --
--                            --
--------------------------------

global_settings = NewSettings();

-- Build type
--------------------------------
global_settings.debug = 1
global_settings.optimize = 0

if ScriptArgs.type ~= nil and ScriptArgs.type:match("^release") then
	global_settings.debug = 0
	if ScriptArgs.type == "release-fast" then
		global_settings.optimize = 1
	end
end


-- Output configuration
--------------------------------
global_settings.lib.prefix = Path(paths.build) .. "/"

global_settings.link.Output = function(settings, input)
	return Path(PathJoin(paths.build, input))
end

global_settings.cc.Output = function(settings, input)
	return Path(PathJoin(PathJoin(paths.build, paths.object), PathBase(input)))
end

-- Compiler configuration
--------------------------------

-- MSVC complains about exception handler without this flag.
if global_settings.cc.exe_cxx == "cl" then
	global_settings.cc.flags:Add('/EHsc')
end

--------------------------------
--                            --
--    Engine configuration    --
--                            --
--------------------------------

local settings = global_settings

settings.cc.includes:Add("include/")
settings.cc.includes:Add("source/")

-- FreeType2
if TARGET_OS == "Win32" then
	settings.cc.includes:Add("vendor/FreeType2/include")
else
	settings.cc.includes:Add("/usr/include/freetype2")
end

-- STB
settings.cc.includes:Add("vendor/stb/include")

-- Source files
--------------------------------

local system_module = Module("source/System", {
	"File.cpp",
	"MessageHandler.cpp",
	"MessageQueue.cpp",
	"SystemEvent.cpp",
	"Log.cpp"
})

local platform_common_module = Module("source/Platform", {
	"PlatformDisplay.cpp"
})


-- if TARGET_OS == "Win32" then -- Needed later for unix.
platform_spec_module = Module("source/Platform/Win32", {
	"Win32Application.cpp",
	"Win32Display.cpp",
	"Win32GLContext.cpp",
	"Win32Input.cpp",
	"Win32Internal.cpp",
	"Win32Keyboard.cpp",
	"Win32Misc.cpp",
	"Win32Mouse.cpp",
	"Win32MsgBuffer.cpp",
	"Win32System.cpp",
	"glad_wgl.c"
})
--end

local input_module = Module("source/Input", {
	"InputDevice.cpp",
	"InputEvent.cpp",
	"InputListener.cpp",
	"InputModule.cpp",
	"Keyboard.cpp",
	"Mouse.cpp"
})

local display_module = Module("source/Display", {
	"Display.cpp",
	"DisplayDescription.cpp",
	"DisplayMode.cpp",
	"GLContext.cpp"
})

local graphics_module = Module("source/Graphics", {
	-- Primitives
	"Vertex2D.cpp",
	"Transformable.cpp",
	"Sprite.cpp",

	-- Rendering
	"BatchRenderer2D.cpp",
	"DefaultRenderer2D.cpp",
	"Renderable2D.cpp",
	"Renderer2D.cpp",
	"RenderState.cpp",
	"Shader.cpp",
	"ShaderProgram.cpp",
	"Texture.cpp",

	-- Text
	"Font/FontDriver.cpp",
	"Font/FreeTypeDriver.cpp",
	"Font/FreeTypeError.cpp",
	"Font.cpp",
	"Text.cpp",

	-- Image
	"Image.cpp",
	"ImageLoader.cpp",

	"OpenGL.cpp",
	"GL/glad.c",
	"GL/CheckError.cpp",
})

local core_module = Module("source/Core", {
	"String.cpp"
})

local math_module = Module("source/Math", {
	"Color.cpp",
	"Logarithm.cpp",
	"Math.cpp",
	"Transform.cpp"
})

local game_module = Module("source", {
	"Game/FPSCounter.cpp",
	"Game/GameTime.cpp",
	"Game.cpp",
})

local scene_module = Module("source/Scene", {
	"Camera2D.cpp"
})

-- Build target
--------------------------------

local obj = Compile(settings, {
	system_module,
	platform_common_module,
	platform_spec_module,
	input_module,
	display_module,
	graphics_module,
	core_module,
	math_module,
	game_module,
	scene_module
})

local libspectre = StaticLibrary(settings,
	"spectre",
	obj
)

--------------------------------
--                            --
--         Examples           --
--                            --
--------------------------------

local example_settings = global_settings

-- Include spectre headers.
example_settings.cc.includes:Add("include/")

-- Link with spectre.
example_settings.link.extrafiles:Add(libspectre)

if TARGET_OS == "Win32" then

	-- Windows needs to link against these.
	example_settings.link.libs:Add("opengl32", "gdi32", "user32")

	-- Staticly link freetype on windows.
	example_settings.link.libpath:Add("vendor/FreeType2/lib/x86")
	if example_settings.debug > 0 then
		example_settings.link.libs:Add("freetype-d-s")
	else
		example_settings.link.libs:Add("freetype-s")
	end
end

-- For now, to get examples working
-- we copy the whole assets directory.
assets = CopyDir(PathJoin(paths.build, paths.examples), "assets")

BuildExamples(example_settings, {
	"text"
}, assets)