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

APP="resh"
VERSION="1.0.1-beta"
BASE_URL="${RESH_BASE_URL:-https://get.reshshell.dev}"

fatal() { echo "ERROR: $*" >&2; exit 1; }
need() { command -v "$1" >/dev/null 2>&1 || fatal "Missing dependency: $1"; }

need curl
need mktemp
need tar
need uname

OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
ARCH="$(uname -m)"

[ "$OS" = "linux" ] || fatal "Linux only (detected: $OS)"
[ "$ARCH" = "x86_64" ] || fatal "This installer expects x86_64 (detected: $ARCH)"

ASSET="${APP}-${VERSION}-linux-x86_64.tar.gz"
URL="${BASE_URL}/releases/latest/${ASSET}"

TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT

curl -fL "$URL" -o "$TMP/$ASSET"
tar -xzf "$TMP/$ASSET" -C "$TMP"

# Exact archive layout:
#   resh-0.9.1-linux-x86_64   (single binary file)
BIN="$TMP/${APP}-${VERSION}-linux-x86_64"
[ -f "$BIN" ] || fatal "Expected binary not found at: $BIN"

chmod +x "$BIN"

DEST="/usr/local/bin/$APP"
if [ "$(id -u)" -eq 0 ]; then
  install -m 0755 "$BIN" "$DEST"
else
  need sudo
  sudo install -m 0755 "$BIN" "$DEST"
fi

"$DEST" --version || true
echo "Done."