#!/usr/bin/env sh
# <%= @app %> installer — generated by tinfoil <%= @tinfoil_version %>
#
# Usage:
#   curl -fsSL <%= @raw_url %> | sh
#   curl -fsSL <%= @raw_url %> | sh -s -- --version v1.2.3
#   curl -fsSL <%= @raw_url %> | sh -s -- --install-dir /usr/local/bin
set -eu

APP="<%= @app %>"
REPO="<%= @repo %>"
DEFAULT_INSTALL_DIR="<%= @install_dir %>"
VERSION=""
INSTALL_DIR="$DEFAULT_INSTALL_DIR"

while [ $# -gt 0 ]; do
  case "$1" in
    --version)
      VERSION="$2"; shift 2 ;;
    --version=*)
      VERSION="${1#*=}"; shift ;;
    --install-dir)
      INSTALL_DIR="$2"; shift 2 ;;
    --install-dir=*)
      INSTALL_DIR="${1#*=}"; shift ;;
    -h|--help)
      sed -n '2,9p' "$0" 2>/dev/null || true
      exit 0 ;;
    *)
      echo "unknown option: $1" >&2
      exit 1 ;;
  esac
done

die() { echo "error: $*" >&2; exit 1; }
need() { command -v "$1" >/dev/null 2>&1 || die "required command not found: $1"; }

need uname
need tar
need mkdir

if command -v curl >/dev/null 2>&1; then
  fetch() { curl -fsSL -o "$2" "$1"; }
  fetch_stdout() { curl -fsSL "$1"; }
elif command -v wget >/dev/null 2>&1; then
  fetch() { wget -qO "$2" "$1"; }
  fetch_stdout() { wget -qO- "$1"; }
else
  die "curl or wget is required"
fi

OS_RAW="$(uname -s)"
ARCH_RAW="$(uname -m)"

case "$OS_RAW" in
  Darwin) OS="apple-darwin" ;;
  Linux)  OS="unknown-linux-musl" ;;
  *) die "unsupported OS: $OS_RAW" ;;
esac

case "$ARCH_RAW" in
  x86_64|amd64) ARCH="x86_64" ;;
  arm64|aarch64) ARCH="aarch64" ;;
  *) die "unsupported architecture: $ARCH_RAW" ;;
esac

TRIPLE="${ARCH}-${OS}"

# Resolve version
if [ -z "$VERSION" ]; then
  echo "Resolving latest release..."
  API_URL="https://api.github.com/repos/${REPO}/releases/latest"
  VERSION="$(fetch_stdout "$API_URL" \
    | tr -d '\r' \
    | awk -F'"' '/"tag_name":/ {print $4; exit}')"
  [ -n "$VERSION" ] || die "failed to determine latest release tag"
fi

# Normalize (strip leading v for the filename)
VERSION_NO_V="${VERSION#v}"
TAG="$VERSION"
case "$TAG" in v*) ;; *) TAG="v$TAG" ;; esac

ARCHIVE="${APP}-${VERSION_NO_V}-${TRIPLE}.tar.gz"
BASE="https://github.com/${REPO}/releases/download/${TAG}"
URL="${BASE}/${ARCHIVE}"
SUMS_URL="${BASE}/checksums-sha256.txt"

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

echo "Downloading ${ARCHIVE}..."
fetch "$URL" "$TMP/$ARCHIVE" || die "download failed: $URL"

# Verify against the combined checksums-sha256.txt that tinfoil
# uploads alongside the archives. Per-archive .sha256 sidecars are
# not published as release assets to keep the release page tidy.
echo "Verifying checksum..."
if fetch "$SUMS_URL" "$TMP/checksums-sha256.txt" 2>/dev/null; then
  EXPECTED="$(awk -v a="$ARCHIVE" '$2 == a || $2 == "*" a {print $1; exit}' "$TMP/checksums-sha256.txt")"

  if [ -z "$EXPECTED" ]; then
    die "no checksum entry for ${ARCHIVE} in checksums-sha256.txt"
  fi

  if command -v shasum >/dev/null 2>&1; then
    ACTUAL="$(shasum -a 256 "$TMP/$ARCHIVE" | awk '{print $1}')"
  elif command -v sha256sum >/dev/null 2>&1; then
    ACTUAL="$(sha256sum "$TMP/$ARCHIVE" | awk '{print $1}')"
  else
    die "neither shasum nor sha256sum found"
  fi
  [ "$EXPECTED" = "$ACTUAL" ] || die "checksum mismatch (expected $EXPECTED, got $ACTUAL)"
  echo "Checksum OK."
else
  echo "warning: checksums-sha256.txt not found; skipping verification" >&2
fi

echo "Extracting..."
tar -xzf "$TMP/$ARCHIVE" -C "$TMP"

# Expand ~ in install dir
case "$INSTALL_DIR" in
  "~"|"~/"*) INSTALL_DIR="${HOME}${INSTALL_DIR#~}" ;;
esac

mkdir -p "$INSTALL_DIR"
mv "$TMP/$APP" "$INSTALL_DIR/$APP"
chmod +x "$INSTALL_DIR/$APP"

echo ""
echo "Installed ${APP} ${VERSION} to ${INSTALL_DIR}/${APP}"

case ":$PATH:" in
  *":${INSTALL_DIR}:"*) ;;
  *)
    echo ""
    echo "note: ${INSTALL_DIR} is not on your PATH."
    echo "      add this to your shell profile:"
    echo "      export PATH=\"${INSTALL_DIR}:\$PATH\""
    ;;
esac