# ---- config ----
TARGET := bin/main
BUILD  ?= debug

CXX := g++
CC  := gcc

CXXFLAGS := -std=c++20 -Wall -Wextra -Wshadow -Wconversion -Wno-unused-parameter
CFLAGS   := -std=c17   -Wall -Wextra -Wno-unused-parameter
CPPFLAGS := -Iexternal/glad/include -Iexternal/glm -Isrc
PKG_CFLAGS := $(shell pkg-config --cflags glfw3 cglm)
PKG_LIBS   := $(shell pkg-config --libs   glfw3 cglm)

# auto-deps: generate .d files next to .o
DEPFLAGS := -MMD -MP

ifeq ($(BUILD),debug)
  CXXFLAGS += -O0 -g
  CFLAGS   += -O0 -g
else
  CXXFLAGS += -O2 -DNDEBUG
  CFLAGS   += -O2 -DNDEBUG
endif

LDFLAGS := $(PKG_LIBS) -ldl

# ---- sources ----
SRCS_CPP := $(shell find src -name '*.cpp')
SRCS_C   := external/glad/src/glad.c
OBJS     := $(SRCS_CPP:%.cpp=obj/%.o) $(SRCS_C:%.c=obj/%.o)
DEPS     := $(OBJS:.o=.d)

# ---- rules ----
.PHONY: all run clean tidy rebuild

all: $(TARGET)

$(TARGET): $(OBJS)
	@mkdir -p $(dir $@)
	$(CXX) $^ -o $@ $(LDFLAGS)

# C++
obj/%.o: %.cpp
	@mkdir -p $(dir $@)
	$(CXX) $(CPPFLAGS) $(PKG_CFLAGS) $(CXXFLAGS) $(DEPFLAGS) -c $< -o $@

# C (glad)
obj/%.o: %.c
	@mkdir -p $(dir $@)
	$(CC)  $(CPPFLAGS) $(PKG_CFLAGS) $(CFLAGS)   $(DEPFLAGS) -c $< -o $@

# include auto-generated header dependencies (safe if missing on first run)
-include $(DEPS)

run: $(TARGET)
	prime-run ./$(TARGET)

clean:
	rm -rf obj

tidy:
	rm -rf obj $(TARGET)

rebuild: clean all