# DWN - Desktop Window Manager
# Simple Makefile - just run 'make' to build!

# Compiler settings
CC = gcc
CFLAGS = -Wall -Wextra -O2 -I./include
LDFLAGS = -lX11 -lXext -lXinerama -lXrandr -lXft -lfontconfig -ldbus-1 -lcurl -lm -lpthread

# Directories
SRC_DIR = src
INC_DIR = include
BUILD_DIR = build
BIN_DIR = bin

# Find all source files automatically
SRCS = $(wildcard $(SRC_DIR)/*.c)
OBJS = $(SRCS:$(SRC_DIR)/%.c=$(BUILD_DIR)/%.o)
DEPS = $(OBJS:.o=.d)

# Output binary
TARGET = $(BIN_DIR)/dwn

# Installation paths
PREFIX ?= /usr/local
BINDIR = $(PREFIX)/bin
DATADIR = $(PREFIX)/share
SYSCONFDIR = /etc

# Get pkg-config flags (with error handling)
PKG_CFLAGS := $(shell pkg-config --cflags x11 xext xinerama xrandr xft fontconfig dbus-1 2>/dev/null)
PKG_LIBS := $(shell pkg-config --libs x11 xext xinerama xrandr xft fontconfig dbus-1 2>/dev/null)

# Use pkg-config if available
ifneq ($(PKG_LIBS),)
    LDFLAGS = $(PKG_LIBS) -lcurl -lm -lpthread
endif
ifneq ($(PKG_CFLAGS),)
    CFLAGS += $(PKG_CFLAGS)
endif

# =============================================================================
# MAIN TARGETS
# =============================================================================

.PHONY: all help clean install uninstall debug run test deps check-deps

# Default target - show help if first time, otherwise build
all: check-deps $(TARGET)
	@echo ""
	@echo "Build successful! Binary created at: $(TARGET)"
	@echo ""
	@echo "Next steps:"
	@echo "  make run      - Test DWN in a window (safe, doesn't affect your desktop)"
	@echo "  make install  - Install DWN system-wide"
	@echo ""

# Show help
help:
	@echo "=============================================="
	@echo "  DWN - Desktop Window Manager"
	@echo "=============================================="
	@echo ""
	@echo "QUICK START:"
	@echo "  make deps     - Install required dependencies (Ubuntu/Debian)"
	@echo "  make          - Build DWN"
	@echo "  make run      - Test DWN in a safe window"
	@echo "  make install  - Install to your system"
	@echo ""
	@echo "ALL COMMANDS:"
	@echo "  make          - Build DWN (release version)"
	@echo "  make debug    - Build with debug symbols"
	@echo "  make run      - Test in Xephyr window (safe!)"
	@echo "  make install  - Install to $(BINDIR)"
	@echo "  make uninstall- Remove from system"
	@echo "  make clean    - Remove build files"
	@echo "  make deps     - Install dependencies (needs sudo)"
	@echo "  make help     - Show this help"
	@echo ""
	@echo "AFTER INSTALL:"
	@echo "  1. Log out of your current session"
	@echo "  2. At login screen, select 'DWN' as your session"
	@echo "  3. Log in and enjoy!"
	@echo ""

# =============================================================================
# BUILD TARGETS
# =============================================================================

# Build with debug symbols
debug: CFLAGS += -g -DDEBUG
debug: clean $(TARGET)
	@echo "Debug build complete!"

# Link all object files into final binary
$(TARGET): $(OBJS) | $(BIN_DIR)
	@echo "Linking..."
	@$(CC) $(OBJS) -o $@ $(LDFLAGS)

# Compile each source file
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c | $(BUILD_DIR)
	@echo "Compiling $<..."
	@$(CC) $(CFLAGS) -MMD -MP -c $< -o $@

# Create build directory
$(BUILD_DIR):
	@mkdir -p $(BUILD_DIR)

# Create bin directory
$(BIN_DIR):
	@mkdir -p $(BIN_DIR)

# Include dependency files
-include $(DEPS)

# =============================================================================
# INSTALL / UNINSTALL
# =============================================================================

install: $(TARGET)
	@echo "Installing DWN..."
	@install -Dm755 $(TARGET) $(DESTDIR)$(BINDIR)/dwn
	@install -Dm644 scripts/dwn.desktop $(DESTDIR)$(DATADIR)/xsessions/dwn.desktop
	@mkdir -p $(DESTDIR)$(SYSCONFDIR)/dwn
	@install -Dm644 config/config.example $(DESTDIR)$(SYSCONFDIR)/dwn/config.example
	@echo ""
	@echo "=============================================="
	@echo "  Installation complete!"
	@echo "=============================================="
	@echo ""
	@echo "To configure DWN, run:"
	@echo "  mkdir -p ~/.config/dwn"
	@echo "  cp $(SYSCONFDIR)/dwn/config.example ~/.config/dwn/config"
	@echo ""
	@echo "Then log out and select 'DWN' at the login screen!"
	@echo ""

uninstall:
	@echo "Removing DWN..."
	@rm -f $(DESTDIR)$(BINDIR)/dwn
	@rm -f $(DESTDIR)$(DATADIR)/xsessions/dwn.desktop
	@rm -rf $(DESTDIR)$(SYSCONFDIR)/dwn
	@echo "DWN has been uninstalled."

# =============================================================================
# DEVELOPMENT / TESTING
# =============================================================================

# Test DWN in a nested X server (safe - doesn't touch your desktop)
run: $(TARGET)
	@echo "Starting DWN in test mode..."
	@echo "(Press Alt+Shift+Q inside the window to quit)"
	Xephyr :1 -screen 1280x720 &
	sleep 1
	DISPLAY=:1 $(TARGET)

# Clean build files
clean:
	@echo "Cleaning build files..."
	@rm -rf $(BUILD_DIR) $(BIN_DIR)
	@echo "Clean complete."

# =============================================================================
# DEPENDENCY MANAGEMENT
# =============================================================================

# Check if dependencies are installed
check-deps:
	@command -v pkg-config >/dev/null 2>&1 || { \
		echo "ERROR: pkg-config is not installed!"; \
		echo "Run: make deps"; \
		exit 1; \
	}
	@pkg-config --exists x11 2>/dev/null || { \
		echo "ERROR: X11 development libraries not found!"; \
		echo "Run: make deps"; \
		exit 1; \
	}
	@pkg-config --exists dbus-1 2>/dev/null || { \
		echo "ERROR: D-Bus development libraries not found!"; \
		echo "Run: make deps"; \
		exit 1; \
	}

# Install dependencies (Ubuntu/Debian)
deps:
	@echo "Installing dependencies..."
	@echo "This requires sudo (administrator) access."
	@echo ""
	@if command -v apt >/dev/null 2>&1; then \
		sudo apt update && sudo apt install -y \
			build-essential \
			pkg-config \
			libx11-dev \
			libxext-dev \
			libxinerama-dev \
			libxrandr-dev \
			libxft-dev \
			libfontconfig1-dev \
			libdbus-1-dev \
			libcurl4-openssl-dev \
			xserver-xephyr \
			dmenu; \
		echo ""; \
		echo "Dependencies installed successfully!"; \
		echo "Now run: make"; \
	elif command -v dnf >/dev/null 2>&1; then \
		sudo dnf install -y \
			gcc make \
			pkg-config \
			libX11-devel \
			libXext-devel \
			libXinerama-devel \
			libXrandr-devel \
			dbus-devel \
			libcurl-devel \
			xorg-x11-server-Xephyr \
			dmenu; \
		echo ""; \
		echo "Dependencies installed successfully!"; \
		echo "Now run: make"; \
	elif command -v pacman >/dev/null 2>&1; then \
		sudo pacman -S --needed \
			base-devel \
			pkg-config \
			libx11 \
			libxext \
			libxinerama \
			libxrandr \
			dbus \
			curl \
			xorg-server-xephyr \
			dmenu; \
		echo ""; \
		echo "Dependencies installed successfully!"; \
		echo "Now run: make"; \
	else \
		echo "ERROR: Could not detect package manager!"; \
		echo "Please install these packages manually:"; \
		echo "  - GCC and Make"; \
		echo "  - pkg-config"; \
		echo "  - X11, Xext, Xinerama, Xrandr development libraries"; \
		echo "  - D-Bus development library"; \
		echo "  - libcurl development library"; \
		echo "  - Xephyr (for testing)"; \
		echo "  - dmenu (for app launcher)"; \
		exit 1; \
	fi

# =============================================================================
# CODE QUALITY (for developers)
# =============================================================================

.PHONY: format check

format:
	@echo "Formatting code..."
	@clang-format -i $(SRC_DIR)/*.c $(INC_DIR)/*.h 2>/dev/null || \
		echo "Note: clang-format not installed (optional)"

check:
	@echo "Running static analysis..."
	@cppcheck --enable=all --inconclusive -I$(INC_DIR) $(SRC_DIR) 2>/dev/null || \
		echo "Note: cppcheck not installed (optional)"