output_dir = "%{cfg.buildcfg}-%{cfg.system}"

-- the LunarG installer sets this on windows. without it the vulkan backend is
-- left out of the build (DONUT_NO_VULKAN) and the app runs opengl only.
vulkan_sdk = os.getenv("VULKAN_SDK")
if os.target() == "windows" and not vulkan_sdk then
	print("VULKAN_SDK is not set: building without the Vulkan backend (OpenGL only)")
end

include_dir = {
	glm = "ext/glm",
	glfw = "ext/glfw/include",
	glad = "ext/glad/include",
	imgui = "ext/imgui",
	imguizmo = "ext/ImGuizmo",
	imgui_backends = "ext/imgui/backends",
	toml11 = "ext/toml11/include",
	nlohmann = "ext/json/single_include",
	stb = "ext/stb",
}

function setup_target()
	targetdir ("bin/" .. output_dir)
	objdir ("bin-int/" .. output_dir .. "/%{prj.name}")
	staticruntime "On"
end

function setup_c_target()
	setup_target()

	filter { "system:macosx or system:linux" }
		buildoptions {
			"-Wall",
			"-Wextra",
			"-Wpedantic",
			"-Wconversion",
			"-Wsign-conversion",
			"-Wshadow",
			"-Wstrict-prototypes",
			"-Wmissing-prototypes",
		}
	filter {}

	filter "configurations:debug"
		runtime "Debug"
		symbols "On"

	-- premake filters don't nest: this one has to name debug again, or the
	-- sanitizers end up in every config
	filter { "configurations:debug", "system:macosx or system:linux" }
		buildoptions {
			"-g",
			"-fno-omit-frame-pointer",
			"-fsanitize=address,undefined",
		}

		linkoptions {
			"-fsanitize=address,undefined",
		}
	filter {}

	filter "configurations:release or dist"
		runtime "Release"
		optimize "Speed"
	filter {}

	filter "configurations:dist"
		symbols "Off"
	filter {}
end

function setup_cpp_target()
	setup_target()

	filter { "system:macosx or system:linux" }
		buildoptions {
			"-Wall",
			"-Wextra",
			"-Wpedantic",
			"-Wconversion",
			"-Wsign-conversion",
			"-Wshadow",
		}
	filter {}

	filter "configurations:debug"
		runtime "Debug"
		symbols "On"

	-- premake filters don't nest: this one has to name debug again, or the
	-- sanitizers end up in every config
	filter { "configurations:debug", "system:macosx or system:linux" }
		buildoptions {
			"-g",
			"-fno-omit-frame-pointer",
			"-fsanitize=address,undefined",
		}

		linkoptions {
			"-fsanitize=address,undefined",
		}
	filter {}

	filter "configurations:release or dist"
		runtime "Release"
		optimize "Speed"
	filter {}

	filter "configurations:dist"
		symbols "Off"
	filter {}
end

newaction {
	trigger = "clean",
	description = "Remove build output and generated project files",

	execute = function()
		os.rmdir("bin")
		os.rmdir("bin-int")
		os.remove("Makefile")

		for _, file in ipairs(os.matchfiles("*.make")) do
			os.remove(file)
		end

		os.rmdir("logs")
		os.remove("config/settings.toml")
		os.remove("imgui.ini")

		print("Cleaned build output and generated project files")
	end
}

newaction {
	trigger = "check",
	description = "Run static analysis with cppcheck",

	execute = function()
		local result = os.execute("make clean")

		if result ~= true and result ~= 0 then
			error("Failed to clean project")
		end

		result = os.execute(
			"bear -- make config=debug"
		)

		if result ~= true and result ~= 0 then
			error("Failed to generate compile_commands.json")
		end

		result = os.execute(
			"cppcheck " ..
			"--project=compile_commands.json " ..
			"--file-filter=src/** " ..
			"--enable=warning,style,performance,portability " ..
			"--error-exitcode=1"
		)

		if result ~= true and result ~= 0 then
			error("cppcheck found issues")
		end
	end
}

workspace "donut"
	architecture "x64"
	startproject "donut"
	multiprocessorcompile "On"

	configurations {
		"debug",
		"release",
		"dist",
	}

	filter "system:windows"
		defines "DONUT_WINDOWS"
	filter "system:linux"
		defines "DONUT_LINUX"
	filter "system:macosx"
		architecture "ARM64"
		defines "DONUT_MACOS"
	filter {}

group "dependencies"

project "glad"
	kind "StaticLib"
	language "C"
	warnings "Off"

	setup_c_target()

	files {
		"ext/glad/include/glad/glad.h",
		"ext/glad/include/KHR/khrplatform.h",
		"ext/glad/src/glad.c",
	}

	includedirs "%{include_dir.glad}"

	filter "system:windows"
		systemversion "latest"
	filter {}

project "glfw"
	kind "StaticLib"
	language "C"
	warnings "Off"

	setup_c_target()

	files {
		"ext/glfw/src/context.c",
		"ext/glfw/src/init.c",
		"ext/glfw/src/input.c",
		"ext/glfw/src/monitor.c",
		"ext/glfw/src/platform.c",
		"ext/glfw/src/vulkan.c",
		"ext/glfw/src/window.c",

		"ext/glfw/src/internal.h",
		"ext/glfw/src/platform.h",
		"ext/glfw/src/mappings.h",

		"ext/glfw/src/null_init.c",
		"ext/glfw/src/null_joystick.c",
		"ext/glfw/src/null_joystick.h",
		"ext/glfw/src/null_monitor.c",
		"ext/glfw/src/null_platform.h",
		"ext/glfw/src/null_window.c",
	}

	filter "system:linux"
		pic "On"

		files {
			"ext/glfw/src/x11_init.c",
			"ext/glfw/src/x11_monitor.c",
			"ext/glfw/src/x11_platform.h",
			"ext/glfw/src/x11_window.c",
			"ext/glfw/src/xkb_unicode.c",
			"ext/glfw/src/xkb_unicode.h",

			"ext/glfw/src/wl_init.c",
			"ext/glfw/src/wl_monitor.c",
			"ext/glfw/src/wl_platform.h",
			"ext/glfw/src/wl_window.c",

			"ext/glfw/src/posix_module.c",
			"ext/glfw/src/posix_time.c",
			"ext/glfw/src/posix_time.h",
			"ext/glfw/src/posix_thread.c",
			"ext/glfw/src/posix_thread.h",

			"ext/glfw/src/glx_context.c",
			"ext/glfw/src/egl_context.c",
			"ext/glfw/src/osmesa_context.c",

			"ext/glfw/src/linux_joystick.c",
			"ext/glfw/src/linux_joystick.h",
		}

		defines "_GLFW_X11"

	filter "system:macosx"
		pic "On"

		files {
			"ext/glfw/src/cocoa_init.m",
			"ext/glfw/src/cocoa_joystick.h",
			"ext/glfw/src/cocoa_joystick.m",
			"ext/glfw/src/cocoa_monitor.m",
			"ext/glfw/src/cocoa_platform.h",
			"ext/glfw/src/cocoa_time.c",
			"ext/glfw/src/cocoa_time.h",
			"ext/glfw/src/cocoa_window.m",

			"ext/glfw/src/nsgl_context.m",
			"ext/glfw/src/egl_context.c",
			"ext/glfw/src/osmesa_context.c",

			"ext/glfw/src/posix_module.c",
			"ext/glfw/src/posix_thread.c",
			"ext/glfw/src/posix_thread.h",
		}

		defines "_GLFW_COCOA"

	filter "system:windows"
		systemversion "latest"

		files {
			"ext/glfw/src/win32_init.c",
			"ext/glfw/src/win32_joystick.c",
			"ext/glfw/src/win32_joystick.h",
			"ext/glfw/src/win32_module.c",
			"ext/glfw/src/win32_monitor.c",
			"ext/glfw/src/win32_platform.h",
			"ext/glfw/src/win32_thread.c",
			"ext/glfw/src/win32_thread.h",
			"ext/glfw/src/win32_time.c",
			"ext/glfw/src/win32_time.h",
			"ext/glfw/src/win32_window.c",
			"ext/glfw/src/wgl_context.c",
			"ext/glfw/src/egl_context.c",
			"ext/glfw/src/osmesa_context.c",
		}

		defines {
			"_GLFW_WIN32",
			"_CRT_SECURE_NO_WARNINGS",
		}
	filter {}

project "imgui"
	kind "StaticLib"
	language "C++"
	cppdialect "C++17"

	setup_cpp_target()

	files {
		"ext/imgui/imgui.cpp",
		"ext/imgui/imgui_draw.cpp",
		"ext/imgui/imgui_tables.cpp",
		"ext/imgui/imgui_widgets.cpp",
		"ext/imgui/imgui_demo.cpp",

		"ext/imgui/backends/imgui_impl_glfw.cpp",
		"ext/imgui/backends/imgui_impl_opengl3.cpp",
	}

	includedirs {
		"%{include_dir.imgui}",
		"%{include_dir.glfw}",
	}

	filter "system:linux"
		pic "On"
	filter "system:macosx"
		files "ext/imgui/backends/imgui_impl_vulkan.cpp"
		externalincludedirs "/opt/homebrew/include"
	filter "system:windows"
		systemversion "latest"
		if vulkan_sdk then
			files "ext/imgui/backends/imgui_impl_vulkan.cpp"
			externalincludedirs (vulkan_sdk .. "/Include")
		end
	filter {}

project "imguizmo"
	kind "StaticLib"
	language "C++"
	cppdialect "C++17"

	setup_cpp_target()

	files {
		"ext/ImGuizmo/ImGuizmo.cpp",
		"ext/ImGuizmo/ImGuizmo.h",
	}

	includedirs {
		"%{include_dir.imgui}",
		"%{include_dir.imguizmo}",
	}

	filter "system:linux"
		pic "On"
	filter "system:windows"
		systemversion "latest"
	filter {}

group ""

project "donut"
	kind "ConsoleApp"
	language "C++"
	cppdialect "C++20"

	setup_cpp_target()

	defines {
		"_CRT_SECURE_NO_WARNINGS",
		"GLFW_INCLUDE_NONE",
	}

	files {
		"ext/glm/glm/**.hpp",
		"ext/glm/glm/**.inl",

		"src/**.h",
		"src/**.cpp",

		"assets/fonts/inter/static/Inter_18pt-Regular.ttf",
		"assets/fonts/inter/static/Inter_18pt-Bold.ttf",
		"assets/fonts/inter/static/Inter_18pt-Light.ttf",
	}

	includedirs "src"
	debugdir "%{wks.location}"   -- every asset path is relative to the repo root

	externalincludedirs {
		"%{include_dir.glm}",
		"%{include_dir.glfw}",
		"%{include_dir.glad}",
		"%{include_dir.imgui}",
		"%{include_dir.imgui_backends}",
		"%{include_dir.imguizmo}",
		"%{include_dir.toml11}",
		"%{include_dir.nlohmann}",
		"%{include_dir.stb}",
	}

	links {
		"glfw",
		"glad",
		"imgui",
		"imguizmo",
	}

	filter { "system:macosx or system:linux", "files:src/platform/vulkan/**" }
		buildoptions "-Wno-missing-field-initializers"
	filter {}

	filter "system:windows"
		systemversion "latest"
		defines "NOMINMAX"             -- glad drags in windows.h, whose min/max macros eat std::min/std::max
		usestandardpreprocessor "On"   -- msvc only knows __VA_OPT__ (log.h) with its conforming preprocessor
		conformancemode "On"
		buildoptions "/utf-8"
		links "opengl32"
		if vulkan_sdk then
			externalincludedirs (vulkan_sdk .. "/Include")
			libdirs (vulkan_sdk .. "/Lib")
			-- delay-loaded, so a box without a Vulkan driver still starts (on OpenGL)
			-- instead of the loader refusing to run the exe at all
			links { "vulkan-1", "delayimp" }
			linkoptions "/DELAYLOAD:vulkan-1.dll"
		else
			defines "DONUT_NO_VULKAN"
			removefiles "src/platform/vulkan/**"
		end

	filter "system:macosx"
		files "src/**.mm"

		prebuildcommands 'bash "%{wks.location}/tools/compile-shaders.sh"'

		externalincludedirs "/opt/homebrew/include"
		libdirs "/opt/homebrew/lib"

		links {
			"Cocoa.framework",
			"IOKit.framework",
			"CoreFoundation.framework",
			"QuartzCore.framework",
			"Metal.framework",
			"Foundation.framework",
			"vulkan",
		}

	filter "configurations:debug"
		defines "DONUT_DEBUG"
	filter "configurations:release"
		defines "DONUT_RELEASE"
	filter "configurations:dist"
		defines "DONUT_DIST"
	filter {}