# Copyright (c) 2020 Jonathan Moallem (@J-Mo63) & Aryeh Zinn (@Raelr)
#
# This code is released under an unmodified zlib license.
# For conditions of distribution and use, please see:
#     https://opensource.org/licenses/Zlib

# Define custom functions
rwildcard = $(wildcard $1$2) $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2))
platformpth = $(subst /,$(PATHSEP),$1)

# Set global macros
buildDir := bin
executable := boids-playground
target := $(buildDir)/$(executable)
sources := $(call rwildcard,src/,*.cpp)
# objects := $(patsubst src/%, $(buildDir)/%, $(patsubst %.cpp, %.o, $(sources)))
objects := $(buildDir)/main.o
depends := $(patsubst %.o, %.d, $(objects))
compileFlags := -std=c++17 -I include
linkFlags = -lraylib
emsdk_path = /usr/lib/emscripten
ext =

# PLATFORM_DESKTOP or PLATFORM_WEB
PLATFORM ?= PLATFORM_DESKTOP

# Check for Windows
ifeq ($(OS), Windows_NT)
	# Set Windows macros
	osName := windows
	CXX ?= g++
	linkFlags += -Wl,--allow-multiple-definition -pthread -lopengl32 -lgdi32 -lwinmm -mwindows -static -static-libgcc -static-libstdc++
	THEN := &&
	PATHSEP := \$(BLANK)
	MKDIR := -mkdir -p
	RM := -del /q
	COPY = -robocopy "$(call platformpth,$1)" "$(call platformpth,$2)" $3
else
	# Set Linux macros
	osName := linux
	CXX ?= g++
	linkFlags += -lGL -lm -lpthread -ldl -lrt -lX11

	# Set UNIX macros
	THEN := ;
	PATHSEP := /
	MKDIR := mkdir -p
	RM := rm -rf
	COPY = cp $1$(PATHSEP)$3 $2
endif

RAYLIB_RELEASE_PATH = lib/$(osName)
ifeq ($(PLATFORM), PLATFORM_WEB)
	RAYLIB_RELEASE_PATH = lib/$(osName)-web
	CXX := emcc

    compileFlags += -I$(emscripten_path)/cache/sysroot/include
	emscripten_path ?= $(emsdk_path)/upstream/emscripten
	linkFlags += -s USE_GLFW=3 -s FORCE_FILESYSTEM=1 $(RAYLIB_RELEASE_PATH)/libraylib.a --shell-file src/shell.html
	ext = .html
endif
linkFlags += -L$(RAYLIB_RELEASE_PATH)

# Lists phony targets for Makefile
.PHONY: all setup submodules run clean

# Default target, compiles, runss and cleans
all: $(target) run clean

# Sets up the project for compiling, generates includes and libs
setup: include lib

# Pull and update the the build submodules
submodules:
	git submodule update --init --recursive

# Copy the relevant header files into includes
include: submodules
	$(MKDIR) $(call platformpth, ./include)
	$(call COPY,depends/raylib/src,./include,raylib.h)
	$(call COPY,depends/raylib/src,./include,raymath.h)
	$(call COPY,depends/raylib/src,./include,rlgl.h)
	$(call COPY,depends/raylib-cpp/include,./include,*.hpp)

# Build the raylib static library file and copy it into lib
lib: submodules
	$(MKDIR) $(call platformpth, $(RAYLIB_RELEASE_PATH))
	cd depends/raylib/src $(THEN) "$(MAKE)" PLATFORM=$(PLATFORM) EMSDK_PATH=$(emsdk_path) RAYLIB_RELEASE_PATH=../../../$(RAYLIB_RELEASE_PATH) -B

# Link the program and create the executable
$(target): $(objects)
	$(CXX) $(objects) -o $(target)$(ext) -DPLATFORM=$(PLATFORM) $(linkFlags)

# Add all rules from dependency files
-include $(depends)

# Compile objects to the build directory
$(buildDir)/%.o: src/%.cpp Makefile
	$(MKDIR) $(call platformpth, $(@D))
	$(CXX) -MMD -MP -c $(compileFlags) $< -o $@ $(CXXFLAGS) -D$(PLATFORM)

# Run the executable
run:
ifeq ($(PLATFORM), PLATFORM_WEB)
	serve $(buildDir) $(ARGS)
else
	$(target) $(ARGS)
endif

# Clean up all relevant files
clean:
	$(RM) $(call platformpth, $(buildDir)/*)

# emcc -o bin/game.html bin/main.o bin/raycast.o -std=c99 -Wall -Wno-missing-braces -Wunused-result -D_DEFAULT_SOURCE -Os -I. -I../raylib/src -I../raylib/src/external -I../raylib/src/extras -I/cache/sysroot/include -L. -L../depends/raylib/src -L../depends/raylib/src -s USE_GLFW=3 -s TOTAL_MEMORY=134217728 -s FORCE_FILESYSTEM=1 ~/code/fun/raylib-game-template/raylib/src/libraylib.a -DPLATFORM_WEB -s ASYNCIFY