#!/usr/bin/env sh
set -eu

SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
APP_DIR="$SCRIPT_DIR"

PKG_ROOT_NAME=${PKG_ROOT_NAME:-vmess}
OUT_TAR=${OUT_TAR:-"$APP_DIR/vmess.tar.gz"}
TMP_DIR=${TMP_DIR:-"/tmp/vmess_pkg.$$"}

ROUTER_CONF=${ROUTER_CONF:-"$APP_DIR/router_local.conf"}
HTTP_SCRIPT=${HTTP_SCRIPT:-"$APP_DIR/scripts/router_local_http.sh"}
UPDATE_SCRIPT=${UPDATE_SCRIPT:-"$APP_DIR/scripts/router_local_update.sh"}

# Defaults aligned with current repo layout.
BUSYBOX_SRC=${BUSYBOX_SRC:-"$APP_DIR/busybox/busybox-armv7l"}
CFST_SRC_DIR=${CFST_SRC_DIR:-"$APP_DIR/cfst_linux_armv5"}

VERBOSE=${VERBOSE:-1}

log() {
  if [ "${VERBOSE}" = "1" ]; then
    printf '%s\n' "$*"
  fi
}

warn() {
  printf '[warn] %s\n' "$*" >&2
}

err() {
  printf '[error] %s\n' "$*" >&2
  exit 1
}

require_file() {
  p="$1"
  [ -f "$p" ] || err "required file missing: $p"
}

require_dir() {
  p="$1"
  [ -d "$p" ] || err "required directory missing: $p"
}

cleanup() {
  rm -rf "$TMP_DIR"
}
trap cleanup EXIT INT TERM

parse_conf_var() {
  conf="$1"
  key="$2"
  if [ ! -r "$conf" ]; then
    return 1
  fi
  sed -n "s|^${key}=\"\\(.*\\)\"$|\\1|p" "$conf" | head -n 1
}

resolve_from_conf_dir() {
  conf="$1"
  val="$2"
  conf_dir=$(CDPATH= cd -- "$(dirname -- "$conf")" && pwd)
  case "$val" in
    "") printf '%s\n' "" ;;
    /*) printf '%s\n' "$val" ;;
    *) printf '%s/%s\n' "$conf_dir" "$val" ;;
  esac
}

check_busybox_httpd() {
  bb="$1"
  if [ ! -x "$bb" ]; then
    warn "BusyBox is not executable: $bb (run: chmod +x \"$bb\")"
    return 1
  fi
  if "$bb" --list 2>/dev/null | grep '^httpd$' >/dev/null 2>&1; then
    return 0
  fi
  warn "BusyBox has no httpd applet: $bb"
  return 1
}

log "[pkg] app dir: $APP_DIR"
log "[pkg] output: $OUT_TAR"

require_file "$ROUTER_CONF"
require_file "$HTTP_SCRIPT"
require_file "$UPDATE_SCRIPT"
require_dir "$CFST_SRC_DIR"
require_file "$BUSYBOX_SRC"

bb_from_conf_raw=$(parse_conf_var "$ROUTER_CONF" "BUSYBOX_BIN" || true)
if [ -n "${bb_from_conf_raw:-}" ]; then
  bb_from_conf=$(resolve_from_conf_dir "$ROUTER_CONF" "$bb_from_conf_raw")
  if [ "$bb_from_conf" != "$BUSYBOX_SRC" ]; then
    warn "BUSYBOX_BIN in conf points to: $bb_from_conf_raw -> $bb_from_conf"
    warn "packaging source busybox is: $BUSYBOX_SRC"
    warn "if needed, set BUSYBOX_SRC to keep packaging and runtime consistent"
  fi
fi

if ! check_busybox_httpd "$BUSYBOX_SRC"; then
  warn "continuing packaging, but router HTTP may fail later"
fi

mkdir -p "$TMP_DIR/$PKG_ROOT_NAME/scripts" "$TMP_DIR/$PKG_ROOT_NAME/cfst"

cp "$ROUTER_CONF" "$TMP_DIR/$PKG_ROOT_NAME/router_local.conf"
cp "$HTTP_SCRIPT" "$TMP_DIR/$PKG_ROOT_NAME/scripts/router_local_http.sh"
cp "$UPDATE_SCRIPT" "$TMP_DIR/$PKG_ROOT_NAME/scripts/router_local_update.sh"
cp "$BUSYBOX_SRC" "$TMP_DIR/$PKG_ROOT_NAME/busybox_armv7l"
cp -R "$CFST_SRC_DIR"/. "$TMP_DIR/$PKG_ROOT_NAME/cfst/"

chmod +x \
  "$TMP_DIR/$PKG_ROOT_NAME/busybox_armv7l" \
  "$TMP_DIR/$PKG_ROOT_NAME/scripts/router_local_http.sh" \
  "$TMP_DIR/$PKG_ROOT_NAME/scripts/router_local_update.sh" || true

rm -f "$OUT_TAR"
tar -czf "$OUT_TAR" -C "$TMP_DIR" "$PKG_ROOT_NAME"

log "[pkg] tar created: $OUT_TAR"
log "[pkg] tar size: $(ls -lh "$OUT_TAR" | awk '{print $5}')"

log "[pkg] tar content preview:"
tar -tzf "$OUT_TAR" | sed -n '1,120p'

if ! tar -tzf "$OUT_TAR" | grep "^$PKG_ROOT_NAME/busybox_armv7l$" >/dev/null; then
  err "package validation failed: busybox_armv7l missing"
fi
if ! tar -tzf "$OUT_TAR" | grep "^$PKG_ROOT_NAME/scripts/router_local_http.sh$" >/dev/null; then
  err "package validation failed: router_local_http.sh missing"
fi
if ! tar -tzf "$OUT_TAR" | grep "^$PKG_ROOT_NAME/cfst/cfst$" >/dev/null; then
  err "package validation failed: cfst binary missing"
fi

log "[pkg] validation passed"