# Simple Makefile for glamac - SDL3 version
# Supports: Arch Linux native, Windows cross-compilation
CC=gcc
MINGW_CC=x86_64-w64-mingw32-gcc

# Directories
SRCDIR=src
BINDIR=bin
BINDIR_WIN=bin/win
INCDIR=include

# SDL3 paths for cross-compilation
CROSS_WIN_SDL3_PREFIX ?= /usr/x86_64-w64-mingw32
CROSS_WIN_SDL3_INCLUDE ?= $(CROSS_WIN_SDL3_PREFIX)/include
CROSS_WIN_SDL3_LIB ?= $(CROSS_WIN_SDL3_PREFIX)/lib

# DLL cache directory
DLL_CACHE_DIR = $(HOME)/.cache/glamac-dlls

# Common flags
CFLAGS_BASE=-I$(INCDIR) -O2 -flto
CFLAGS_NATIVE=$(CFLAGS_BASE) -march=native
CFLAGS_CROSS=$(CFLAGS_BASE) -I$(CROSS_WIN_SDL3_INCLUDE)

# OS Detection
ifeq ($(OS),Windows_NT)
    # Windows host
    EXE_EXT=.exe
    MKDIR=mkdir
    RM=del /Q
    RMDIR=rmdir /s /q
    SDL3_LDFLAGS=-lSDL3 -lSDL3_ttf -mwindows
    NATIVE_CC=$(CC)
    NATIVE_CFLAGS=$(CFLAGS_BASE)
    NATIVE_LDFLAGS=$(SDL3_LDFLAGS)
    NATIVE_EXT=.exe
else
    # Linux host (Arch)
    EXE_EXT=
    MKDIR=mkdir -p
    RM=rm -f
    RMDIR=rm -rf
    SDL3_LDFLAGS=$(shell pkg-config --cflags --libs sdl3 SDL3_ttf 2>/dev/null || echo -lSDL3 -lSDL3_ttf) -lm
    NATIVE_CC=$(CC)
    NATIVE_CFLAGS=$(CFLAGS_NATIVE)
    NATIVE_LDFLAGS=$(SDL3_LDFLAGS)
    NATIVE_EXT=
    # Cross-compilation flags
    CROSS_LDFLAGS=-L$(CROSS_WIN_SDL3_LIB) -lmingw32 -lSDL3 -lSDL3_ttf -mwindows -static-libgcc
endif

# Source files
GLAMAC_SRC_LIST=$(SRCDIR)/glamac/glamac.c \
                $(SRCDIR)/glamac/glamac_view.c \
                $(SRCDIR)/glamac/glamac_render.c \
                $(SRCDIR)/glamac/glamac_events.c \
                $(SRCDIR)/glamac/glass_data.c

GLAMAC_SRC=$(wildcard $(GLAMAC_SRC_LIST))
EXPECTED_GLAMAC_FILES=5
FOUND_GLAMAC_FILES=$(words $(GLAMAC_SRC))

GLA_SRCS=$(wildcard $(SRCDIR)/glautils/*.c)
GLA_EXES_NATIVE=$(patsubst $(SRCDIR)/glautils/%.c, $(BINDIR)/%$(NATIVE_EXT), $(GLA_SRCS))
GLA_EXES_WIN=$(patsubst $(SRCDIR)/glautils/%.c, $(BINDIR_WIN)/%.exe, $(GLA_SRCS))

# Setup targets
setup:
	$(MKDIR) $(BINDIR)

setup-cross:
	$(MKDIR) $(BINDIR) $(BINDIR_WIN)

# Check source files
check-files:
	@echo "Checking for glamac source files..."
	@echo "Expected $(EXPECTED_GLAMAC_FILES) files, found $(FOUND_GLAMAC_FILES)"
	@if [ $(FOUND_GLAMAC_FILES) -ne $(EXPECTED_GLAMAC_FILES) ]; then \
		echo "ERROR: Missing glamac source files!"; \
		exit 1; \
	fi
	@echo "All glamac source files found."

# Default: build for current platform
all: check-files setup glamac glautils

# Native compilation
glamac: check-files $(BINDIR)/glamac$(NATIVE_EXT)
glautils: $(GLA_EXES_NATIVE)

$(BINDIR)/glamac$(NATIVE_EXT): $(GLAMAC_SRC)
	@echo "Compiling glamac..."
	$(NATIVE_CC) $^ $(NATIVE_CFLAGS) $(NATIVE_LDFLAGS) -o $@

$(BINDIR)/%$(NATIVE_EXT): $(SRCDIR)/glautils/%.c
	$(NATIVE_CC) $< $(NATIVE_CFLAGS) -o $@

# Windows cross-compilation (Linux only)
ifeq ($(OS),Windows_NT)
# Windows host - no cross-compilation needed
glamac-win all-win:
	@echo "Cross-compilation not needed on Windows. Use 'make all' instead."

install-sdl3-cross download-dlls install-dlls copy-dlls-win:
	@echo "Cross-compilation operations not available on Windows host."

else
# Linux host - cross-compilation available

# Check cross-compilation dependencies
check-cross-deps:
	@echo "Checking cross-compilation dependencies..."
	@which $(MINGW_CC) >/dev/null 2>&1 || (echo "ERROR: $(MINGW_CC) not found. Install with: sudo pacman -S mingw-w64-gcc" && exit 1)
	@test -f $(CROSS_WIN_SDL3_INCLUDE)/SDL3/SDL.h || (echo "ERROR: SDL3 headers not found. Run 'make install-sdl3-cross'" && exit 1)
	@test -f $(CROSS_WIN_SDL3_LIB)/libSDL3.dll.a || (echo "ERROR: SDL3 libraries not found. Run 'make install-sdl3-cross'" && exit 1)
	@echo "Cross-compilation dependencies OK"

# Windows targets
glamac-win: check-files check-cross-deps setup-cross $(BINDIR_WIN)/glamac.exe copy-dlls-win
all-win: glamac-win $(GLA_EXES_WIN)

$(BINDIR_WIN)/glamac.exe: $(GLAMAC_SRC)
	@echo "Cross-compiling glamac for Windows..."
	$(MINGW_CC) $^ $(CFLAGS_CROSS) $(CROSS_LDFLAGS) -o $@

$(BINDIR_WIN)/%.exe: $(SRCDIR)/glautils/%.c
	$(MINGW_CC) $< $(CFLAGS_CROSS) -static-libgcc -o $@

# DLL Management

# Download DLLs to cache (only once)
download-dlls:
	@echo "Downloading SDL3 DLLs to cache..."
	@$(MKDIR) $(DLL_CACHE_DIR)
	
	@if [ ! -f "$(DLL_CACHE_DIR)/SDL3.dll" ]; then \
		echo "Downloading SDL3.dll..."; \
		cd $(DLL_CACHE_DIR) && \
		wget -q https://github.com/libsdl-org/SDL/releases/download/release-3.2.10/SDL3-3.2.10-win32-x64.zip && \
		unzip -j SDL3-3.2.10-win32-x64.zip SDL3.dll && \
		rm SDL3-3.2.10-win32-x64.zip; \
	else \
		echo "SDL3.dll already cached"; \
	fi
	
	@if [ ! -f "$(DLL_CACHE_DIR)/SDL3_ttf.dll" ]; then \
		echo "Downloading SDL3_ttf.dll..."; \
		cd $(DLL_CACHE_DIR) && \
		wget -q https://github.com/libsdl-org/SDL_ttf/releases/download/release-3.2.2/SDL3_ttf-3.2.2-win32-x64.zip && \
		unzip -j SDL3_ttf-3.2.2-win32-x64.zip SDL3_ttf.dll && \
		rm SDL3_ttf-3.2.2-win32-x64.zip; \
	else \
		echo "SDL3_ttf.dll already cached"; \
	fi
	
	@echo "DLLs cached in $(DLL_CACHE_DIR)/"

# Install DLLs to system location (optional, for system-wide access)
install-dlls: download-dlls
	@echo "Installing DLLs to system location..."
	sudo cp $(DLL_CACHE_DIR)/SDL3.dll $(CROSS_WIN_SDL3_PREFIX)/bin/ 2>/dev/null || \
	(sudo mkdir -p $(CROSS_WIN_SDL3_PREFIX)/bin && sudo cp $(DLL_CACHE_DIR)/SDL3.dll $(CROSS_WIN_SDL3_PREFIX)/bin/)
	sudo cp $(DLL_CACHE_DIR)/SDL3_ttf.dll $(CROSS_WIN_SDL3_PREFIX)/bin/
	@echo "DLLs installed to $(CROSS_WIN_SDL3_PREFIX)/bin/"

# Copy DLLs to Windows build directory
copy-dlls-win: download-dlls
	@echo "Copying DLLs for Windows distribution..."
	@$(MKDIR) $(BINDIR_WIN)
	cp $(DLL_CACHE_DIR)/SDL3.dll $(BINDIR_WIN)/
	cp $(DLL_CACHE_DIR)/SDL3_ttf.dll $(BINDIR_WIN)/
	@echo ""
	@echo "Windows distribution ready in $(BINDIR_WIN)/"
	@ls -la $(BINDIR_WIN)/
	@echo ""
	@echo "Copy the entire $(BINDIR_WIN)/ directory to your Windows machine."

# Install SDL3 for cross-compilation
install-sdl3-cross:
	@echo "Installing SDL3 development libraries for MinGW cross-compilation..."
	@echo "Latest versions: SDL3 3.2.10, SDL3_ttf 3.2.2"
	@read -p "Continue? [y/N] " confirm && [ "$$confirm" = "y" ] || exit 1
	
	@which wget >/dev/null 2>&1 || (echo "ERROR: wget not found. Install with: sudo pacman -S wget" && exit 1)
	@which $(MINGW_CC) >/dev/null 2>&1 || (echo "ERROR: MinGW not found. Install with: sudo pacman -S mingw-w64-gcc" && exit 1)
	
	sudo mkdir -p $(CROSS_WIN_SDL3_PREFIX)/include $(CROSS_WIN_SDL3_PREFIX)/lib
	
	@echo "Downloading SDL3 development libraries..."
	cd /tmp && \
	wget -q https://github.com/libsdl-org/SDL/releases/download/release-3.2.10/SDL3-devel-3.2.10-mingw.tar.gz && \
	wget -q https://github.com/libsdl-org/SDL_ttf/releases/download/release-3.2.2/SDL3_ttf-devel-3.2.2-mingw.tar.gz && \
	tar -xzf SDL3-devel-3.2.10-mingw.tar.gz && \
	tar -xzf SDL3_ttf-devel-3.2.2-mingw.tar.gz && \
	sudo cp -r SDL3-3.2.10/x86_64-w64-mingw32/include/* $(CROSS_WIN_SDL3_PREFIX)/include/ && \
	sudo cp -r SDL3-3.2.10/x86_64-w64-mingw32/lib/* $(CROSS_WIN_SDL3_PREFIX)/lib/ && \
	sudo cp -r SDL3_ttf-3.2.2/x86_64-w64-mingw32/include/* $(CROSS_WIN_SDL3_PREFIX)/include/ && \
	sudo cp -r SDL3_ttf-3.2.2/x86_64-w64-mingw32/lib/* $(CROSS_WIN_SDL3_PREFIX)/lib/ && \
	rm -rf SDL3-3.2.10* SDL3_ttf-3.2.2*
	
	@echo "SDL3 cross-compilation libraries installed successfully!"

endif

# Arch Linux SDL3 installation
install-sdl3-arch:
	@echo "Installing SDL3 on Arch Linux..."
	sudo pacman -S sdl3
	@echo "Installing SDL3_ttf from AUR (using yay)..."
	yay -S sdl3_ttf
	@echo "SDL3 installation complete!"

# Clean targets
clean:
ifeq ($(OS),Windows_NT)
	@if exist $(BINDIR) $(RMDIR) $(BINDIR)
else
	$(RMDIR) $(BINDIR) 2>/dev/null || true
endif

clean-dlls:
ifneq ($(OS),Windows_NT)
	$(RMDIR) $(DLL_CACHE_DIR) 2>/dev/null || true
	@echo "DLL cache cleared"
else
	@echo "DLL cache operations not available on Windows"
endif

rebuild: clean all

# Help
help:
	@echo "GlaMaC Build System - SDL3"
	@echo ""
	@echo "Native targets (any platform):"
	@echo "  all              - Build for current platform"
	@echo "  glamac           - Build glamac only"
	@echo "  glautils         - Build utilities only"
	@echo "  clean            - Clean build artifacts"
	@echo "  rebuild          - Clean and rebuild"
	@echo ""
ifeq ($(OS),Windows_NT)
	@echo "Windows host - use native targets above"
else
	@echo "Cross-compilation targets (Arch Linux → Windows):"
	@echo "  glamac-win       - Build glamac for Windows (includes DLLs)"
	@echo "  all-win          - Build everything for Windows"
	@echo ""
	@echo "Setup and maintenance:"
	@echo "  install-sdl3-arch    - Install SDL3 on Arch Linux"
	@echo "  install-sdl3-cross   - Install SDL3 for cross-compilation"
	@echo "  download-dlls        - Download Windows DLLs to cache"
	@echo "  install-dlls         - Install DLLs to system location"
	@echo "  copy-dlls-win        - Copy DLLs to Windows build directory"
	@echo "  clean-dlls           - Clear DLL cache"
	@echo "  check-cross-deps     - Check cross-compilation setup"
endif
	@echo ""
	@echo "Quick start:"
ifeq ($(OS),Windows_NT)
	@echo "  1. Install SDL3: (install SDL3 development libraries)"
	@echo "  2. make all"
else
	@echo "  1. sudo pacman -S mingw-w64-gcc  # Install cross-compiler"
	@echo "  2. make install-sdl3-cross       # Install SDL3 for Windows"
	@echo "  3. make glamac-win               # Build for Windows (auto-downloads DLLs)"
endif

.PHONY: all setup setup-cross glamac glautils glamac-win all-win check-files check-cross-deps download-dlls install-dlls copy-dlls-win install-sdl3-cross install-sdl3-arch clean clean-dlls rebuild help