#!/usr/bin/env bash
set -e

# Find the odin binary
export PATH="$HOME/.odin:$PATH"

SRC_DIR="src"
OUT_DIR="out"
OUT_NAME="pong"

BUILD_ONLY=0
OPTIMIZED=0
WEB=0
CLEAN=0
DEBUGGER=0
VALGRIND=0

usage() {
	echo "Usage: $0 [-b] [-o] [-w] [-d] [-v] [-c] [-h]"
	echo "  -b   build only, don't run"
	echo "  -o   optimized release build (-o:speed, no debug info)"
	echo "  -w   web/WASM build (js_wasm32 target)"
	echo "  -d   build then launch in debugger instead of running"
	echo "  -v   build then run under Valgrind"
	echo "  -c   clean build artifacts"
	echo "  -h   show this help"
	exit 1
}

while getopts "bowdvch" opt; do
	case $opt in
		b) BUILD_ONLY=1 ;;
		o) OPTIMIZED=1 ;;
		w) WEB=1 ;;
		d) DEBUGGER=1 ;;
		v) VALGRIND=1 ;;
		c) CLEAN=1 ;;
		h) usage ;;
		*) usage ;;
	esac
done

mkdir -p "$OUT_DIR"

if [ "$CLEAN" -eq 1 ]; then
	echo "Cleaning..."
	rm -rf "${OUT_DIR:?}"/*
	exit 0
fi

if [ "$WEB" -eq 1 ]; then
	echo "Building web (WASM)..."
	odin build "$SRC_DIR" \
		-target:js_wasm32 \
		-out:"$OUT_DIR/$OUT_NAME.wasm" \
		$( [ "$OPTIMIZED" -eq 1 ] && echo "-o:speed" || echo "-debug" )

	# Copy the HTML shell if one exists
	if [ -f "web/index_template.html" ]; then
		cp web/index_template.html "$OUT_DIR/index.html"
	fi

	echo "Web build complete -> $OUT_DIR/$OUT_NAME.wasm"
	exit 0
fi

if [ "$OPTIMIZED" -eq 1 ]; then
	echo "Building optimized ($SRC_DIR -> $OUT_DIR/$OUT_NAME)..."
	odin build "$SRC_DIR" \
		-out:"$OUT_DIR/$OUT_NAME" \
		-o:speed \
		-no-bounds-check
else
	echo "Building debug ($SRC_DIR -> $OUT_DIR/$OUT_NAME)..."
	odin build "$SRC_DIR" \
		-out:"$OUT_DIR/$OUT_NAME" \
		-define:DEBUG_MODE=true
fi

echo "Build complete."

if [ "$BUILD_ONLY" -eq 0 ]; then
	echo "----------------------------------------"

	if [ "$DEBUGGER" -eq 1 ]; then
		lldb "$OUT_DIR/$OUT_NAME"

	elif [ "$VALGRIND" -eq 1 ]; then
        # --show-leak-kinds=definite,possible reduces tons of noise
        # still shows the leaks you actually need to fix.
		# to audit whole process, temporarily switch back to --show-leak-kinds=all
    	valgrind \
        --leak-check=full \
        --show-leak-kinds=definite,possible \
        --track-origins=yes \
        --errors-for-leak-kinds=definite,possible \
        --error-exitcode=1 \
		--log-file="$OUT_DIR/valgrind.log" \
		"./$OUT_DIR/$OUT_NAME"

		echo
		echo "Valgrind report written to $OUT_DIR/valgrind.log"
	else
		"./$OUT_DIR/$OUT_NAME"
	fi
fi