# ------------------------ Config -----------------------

# PLATFORM can be 'web' or 'desktop'
PLATFORM ?= desktop

SHELL := /bin/zsh
TOP_BUILD_DIR := build
EXECUTABLE := boids-playground
SUBMODULES_PATH := depends

# WEB_HEAP_SIZE default: 16777216 (16MiB)
WEB_HEAP_SIZE := 335544320
# WEB_STACK_SIZE default: 65536 (64KiB)
WEB_STACK_SIZE := 196608
WEB_SHELL := src/shell.html

COMPILER_FLAGS := -std=c++17 -Wno-enum-compare -O3 -g
LINKER_FLAGS   := -lraylib

# SOURCES := $(wildcard src/*.cpp)
SOURCES := src/main.cpp

COMPILER_FLAGS += -I$(SUBMODULES_PATH)/raygui/src/

# ----------------- Prepare variables for targets ------------------

EXT :=
EMSDK_PATH := $(SUBMODULES_PATH)/emsdk
RAYLIB_PLATFORM := PLATFORM_DESKTOP

COMPILER_FLAGS += -I$(SUBMODULES_PATH)/raylib/src
COMPILER_FLAGS += -I$(SUBMODULES_PATH)/raylib-cpp/include

ifeq ($(OS), Windows_NT)
	CXX ?= g++
	THEN := &&
	MKDIR := -mkdir -p
	RM := -del /q
	COPY = -robocopy "$1" "$2" $3
	EXT = .exe
	MOVE := move

	OS_NAME := windows
	LINKER_FLAGS += -Wl,--allow-multiple-definition -pthread -lopengl32
	LINKER_FLAGS += -lgdi32 -lwinmm -mwindows -static -static-libgcc -static-libstdc++
else
	CXX ?= g++
	THEN := ;
	MKDIR := mkdir -p
	RM := rm -rf
	COPY = cp $1/$3 $2
	MOVE := mv

	OS_NAME := linux
	LINKER_FLAGS += -lGL -lm -lpthread -ldl -lrt -lX11
endif

BUILD_NAME := $(OS_NAME)-$(PLATFORM)
BUILD_DIR := $(TOP_BUILD_DIR)/$(BUILD_NAME)
RAYLIB_RELEASE_PATH := $(TOP_BUILD_DIR)/raylib-$(BUILD_NAME)

OBJECTS := $(patsubst src/%, $(BUILD_DIR)/%, $(patsubst %.cpp, %.o, $(SOURCES)))
OBJECT_DEPENDS := $(patsubst %.o, %.d, $(OBJECTS))

LIB_DEPENDENCIES :=
ifeq ($(PLATFORM), web)
	export EMSDK_QUIET=1
	RAYLIB_PLATFORM := PLATFORM_WEB
	CXX := source $(SUBMODULES_PATH)/emsdk/emsdk_env.sh $(THEN) emcc
	EXT = .html

	EMSCRIPTEN_PATH ?= $(EMSDK_PATH)/upstream/emscripten
	COMPILER_FLAGS += -I$(EMSCRIPTEN_PATH)/cache/sysroot/include
	COMPILER_FLAGS += -D_DEFAULT_SOURCE
	LINKER_FLAGS += -s USE_GLFW=3
	LINKER_FLAGS += -s FORCE_FILESYSTEM=1
	LINKER_FLAGS += $(RAYLIB_RELEASE_PATH)/libraylib.a
	LINKER_FLAGS += --shell-file $(WEB_SHELL)
	LINKER_FLAGS += -s TOTAL_MEMORY=$(WEB_HEAP_SIZE)
	LINKER_FLAGS += -s STACK_SIZE=$(WEB_STACK_SIZE)
	LIB_DEPENDENCIES += emsdk
else
	COMPILER_FLAGS += -march=native
endif

LINKER_FLAGS += -L$(RAYLIB_RELEASE_PATH)
MAIN_TARGET := $(BUILD_DIR)/$(EXECUTABLE)$(EXT)

# ------------------------ Targets -----------------------

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

.DEFAULT_GOAL := all

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

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

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

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

# Build the raylib static library file and copy it into lib
lib: submodules $(LIB_DEPENDENCIES)
	$(MKDIR) $(RAYLIB_RELEASE_PATH)
	cd $(SUBMODULES_PATH)/raylib/src $(THEN) \
		"$(MAKE)" \
		PLATFORM=$(RAYLIB_PLATFORM) \
		EMSDK_PATH=$(EMSDK_PATH) \
		RAYLIB_RELEASE_PATH=../../../$(RAYLIB_RELEASE_PATH) -B

# Install and activate emscripten
emsdk: submodules
	cd $(SUBMODULES_PATH)/emsdk $(THEN) ./emsdk install  latest
	cd $(SUBMODULES_PATH)/emsdk $(THEN) ./emsdk activate latest

# Link the program and create the executable
$(MAIN_TARGET): $(OBJECTS)
	$(CXX) $(OBJECTS) -o $(MAIN_TARGET) $(LINKER_FLAGS) -D$(RAYLIB_PLATFORM)
ifeq ($(PLATFORM), web)
	$(MOVE) $(MAIN_TARGET) $(BUILD_DIR)/index.html
endif

# Compile objects to the build directory
$(BUILD_DIR)/%.o: src/%.cpp Makefile
	$(MKDIR) $(BUILD_DIR)
	$(CXX) -MMD -MP -c $(COMPILER_FLAGS) $< -o $@ $(CXXFLAGS) -D$(RAYLIB_PLATFORM)

# Run the executable
run:
ifeq ($(PLATFORM), web)
	python -m http.server 8080 -d $(BUILD_DIR)
else
	$(MAIN_TARGET) $(ARGS)
endif

# Clean up all relevant files
clean:
	$(RM) $(BUILD_DIR)