# Compiler and tools
CC = emcc
XXD = xxd

# Directories
SRC_DIR = src
SHADER_DIR = $(SRC_DIR)/shaders
GENERATED_DIR = $(SRC_DIR)/generated
SOKOL_DIR = ../sokol
NUKLEAR_DIR = ../nuklear

# Output
TARGET = app.html

# Source files
C_SOURCES = $(SRC_DIR)/main.c

# Dynamic shader processing
SHADER_FILES = $(wildcard $(SHADER_DIR)/*)
SHADER_HEADERS = $(patsubst $(SHADER_DIR)/%,$(GENERATED_DIR)/%.h,$(SHADER_FILES))

# Compiler flags
EMCC_FLAGS = -sUSE_WEBGPU \
             -sASSERTIONS \
             -sWASM_BIGINT \
             -sALLOW_MEMORY_GROWTH \
             -msimd128 \
             -sFILESYSTEM=0

# Include directories
INCLUDES = -I$(SOKOL_DIR) -I$(NUKLEAR_DIR)

# Shell template
SHELL_FILE = shell.html

# Default target
all: $(TARGET)

# Main build target
$(TARGET): $(SHADER_HEADERS) $(C_SOURCES) $(SHELL_FILE)
	$(CC) $(C_SOURCES) \
		-o $(TARGET) \
		$(EMCC_FLAGS) \
		-O3 \
		$(INCLUDES) \
		--shell-file=$(SHELL_FILE)

# Pattern rule for generating shader headers
$(GENERATED_DIR)/%.h: $(SHADER_DIR)/% | $(GENERATED_DIR)
	@echo "Generating header for $<"
	$(XXD) -i $< $@

# Create generated directory if it doesn't exist
$(GENERATED_DIR):
	mkdir -p $(GENERATED_DIR)

debug: $(SHADER_HEADERS) $(C_SOURCES) $(SHELL_FILE)
	$(CC) $(C_SOURCES) \
		-o $(TARGET) \
		$(EMCC_FLAGS) \
		-g -gsource-map=inline \
		$(INCLUDES) \
		--shell-file=$(SHELL_FILE)

# Clean build artifacts
clean:
	rm -f $(TARGET) app.js app.wasm
	rm -rf $(GENERATED_DIR)

# Rebuild everything
rebuild: clean all

# List all shader files (for debugging)
list-shaders:
	@echo "Shader files found:"
	@echo "$(SHADER_FILES)"
	@echo ""
	@echo "Generated headers:"
	@echo "$(SHADER_HEADERS)"

# Phony targets
.PHONY: all clean rebuild list-shaders