CXX := g++
CXXFLAGS := -std=c++20 -Wall -Wextra -Wpedantic -O2
CPPFLAGS :=
LDFLAGS :=
SRC_DIR := src
INC_DIR := include
BUILD_DIR := build
TARGET := app
CLANG_FORMAT ?= clang-format
CLANG_TIDY ?= clang-tidy

SRCS := $(shell find $(SRC_DIR) -name '*.cpp' 2>/dev/null)
OBJS := $(patsubst $(SRC_DIR)/%.cpp,$(BUILD_DIR)/%.o,$(SRCS))
SRC_HDRS := $(shell find $(SRC_DIR) \( -name '*.hpp' -o -name '*.h' \) 2>/dev/null)
INCLUDE_HDRS := $(shell [ -d $(INC_DIR) ] && find $(INC_DIR) \( -name '*.hpp' -o -name '*.h' \) 2>/dev/null)
FORMAT_SRCS := $(SRCS) $(SRC_HDRS) $(INCLUDE_HDRS)

CPPFLAGS += -I$(INC_DIR)

$(TARGET): $(OBJS)
	$(CXX) $(OBJS) $(LDFLAGS) -o $@

$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp
	@mkdir -p $(dir $@)
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@

$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

.PHONY: clean run format tidy tools install

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

clean:
	rm -rf $(BUILD_DIR) $(TARGET)

format:
	@command -v $(CLANG_FORMAT) >/dev/null 2>&1 || { \
		echo "error: $(CLANG_FORMAT) not found in PATH" >&2; \
		exit 1; \
	}
	@if [ -n "$(strip $(FORMAT_SRCS))" ]; then \
		$(CLANG_FORMAT) -i $(FORMAT_SRCS); \
		echo "formatted: $(FORMAT_SRCS)"; \
	else \
		echo "warning: no source files found to format"; \
	fi

tidy:
	@command -v $(CLANG_TIDY) >/dev/null 2>&1 || { \
		echo "error: $(CLANG_TIDY) not found in PATH" >&2; \
		exit 1; \
	}
	@if [ -n "$(strip $(SRCS))" ]; then \
		for src in $(SRCS); do \
			echo "running clang-tidy on $$src"; \
			$(CLANG_TIDY) $$src -- $(CPPFLAGS) $(CXXFLAGS); \
		done; \
	else \
		echo "warning: no source files found for clang-tidy"; \
	fi

tools:
	@command -v $(CLANG_FORMAT) >/dev/null 2>&1 && echo "found $(CLANG_FORMAT)" || echo "missing $(CLANG_FORMAT)"
	@command -v $(CLANG_TIDY) >/dev/null 2>&1 && echo "found $(CLANG_TIDY)" || echo "missing $(CLANG_TIDY)"

install:
	@missing=""; \
	if ! command -v $(CLANG_FORMAT) >/dev/null 2>&1; then \
		missing="$$missing clang-format"; \
	fi; \
	if ! command -v $(CLANG_TIDY) >/dev/null 2>&1; then \
		missing="$$missing clang-tidy"; \
	fi; \
	if [ -z "$$missing" ]; then \
		echo "clang-format and clang-tidy already installed"; \
	else \
		echo "missing tools:$$missing"; \
		if command -v apt-get >/dev/null 2>&1; then \
			if command -v sudo >/dev/null 2>&1; then SUDO=sudo; else SUDO=; fi; \
			$$SUDO apt-get update; \
			$$SUDO apt-get install -y $$missing; \
		else \
			echo "error: apt-get not available; install manually:$$missing" >&2; \
			exit 1; \
		fi; \
	fi