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

repo="${MEGA_WALLET_CLI_REPO:-megaeth-labs/wallet-cli}"
asset_prefix="${MEGA_WALLET_CLI_ASSET_PREFIX:-mega-wallet-cli}"
version="${MEGA_WALLET_CLI_VERSION:-}"

usage() {
  cat <<'USAGE'
Usage: install [options]

Bootstrap the MegaETH MOSS CLI installer from GitHub Releases.

Options are forwarded to the release-owned installer. Common options:
  --version VERSION       Release tag to install (default: latest release)
  --repo OWNER/REPO       GitHub repo to fetch from (default: megaeth-labs/wallet-cli)
  --prefix DIR            Prefix used when --bin-dir is omitted (default: ~/.local)
  --bin-dir DIR           Directory for the mega wrapper (default: <prefix>/bin)
  --install-root DIR      Versioned install root (default: ~/.mega/wallet-cli)
  --no-skill              Skip installing the bundled agent skill
  --skill-agent AGENT     Skill target: codex, claude, hermes, openclaw, or all
  --dry-run               Print actions without writing install files
  -h, --help              Show installer help

Examples:
  curl -fsSL https://account.megaeth.com/install | sh
  curl -fsSL https://account.megaeth.com/install | sh -- --version v0.1.4
USAGE
}

pending=""
for arg in "$@"; do
  if [ -n "$pending" ]; then
    case "$pending" in
      repo) repo="$arg" ;;
      version) version="$arg" ;;
    esac
    pending=""
    continue
  fi

  case "$arg" in
    --repo)
      pending="repo"
      ;;
    --repo=*)
      repo="${arg#--repo=}"
      ;;
    --version)
      pending="version"
      ;;
    --version=*)
      version="${arg#--version=}"
      ;;
    -h|--help)
      usage
      exit 0
      ;;
  esac
done

if [ -n "$pending" ]; then
  printf 'error: missing value for --%s\n' "$pending" >&2
  exit 2
fi

case "$repo" in
  */*) ;;
  *)
    printf 'error: --repo must be OWNER/REPO\n' >&2
    exit 2
    ;;
esac

error() {
  printf 'error: %s\n' "$1" >&2
  exit 1
}

need() {
  command -v "$1" >/dev/null 2>&1 || error "missing required command: $1"
}

github_api_get() {
  url="$1"
  if [ -n "${GITHUB_TOKEN:-}" ]; then
    curl -fsSL -H "Authorization: Bearer $GITHUB_TOKEN" "$url"
  else
    curl -fsSL "$url"
  fi
}

download() {
  url="$1"
  output="$2"
  if [ -n "${GITHUB_TOKEN:-}" ]; then
    curl -fL -H "Authorization: Bearer $GITHUB_TOKEN" "$url" -o "$output"
  else
    curl -fL "$url" -o "$output"
  fi
}

sha256_file() {
  if command -v sha256sum >/dev/null 2>&1; then
    sha256sum "$1" | awk '{print $1}'
  else
    shasum -a 256 "$1" | awk '{print $1}'
  fi
}

latest_version() {
  github_api_get "https://api.github.com/repos/$repo/releases/latest" |
    sed -n 's/.*"tag_name"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' |
    head -n 1
}

need curl
if ! command -v sha256sum >/dev/null 2>&1 && ! command -v shasum >/dev/null 2>&1; then
  error "missing required command: sha256sum or shasum"
fi

if [ -z "$version" ]; then
  printf 'info: Resolving latest MegaETH MOSS CLI release for %s\n' "$repo" >&2
  version="$(latest_version)"
fi

[ -n "$version" ] || error "could not resolve release version"
case "$version" in
  */*|"")
    error "invalid release version: $version"
    ;;
esac

installer_asset="$asset_prefix-$version-install.sh"
base_url="https://github.com/$repo/releases/download/$version"
installer_url="$base_url/$installer_asset"
checksum_url="$installer_url.sha256"

tmp_dir="$(mktemp -d 2>/dev/null || mktemp -d -t mega-wallet-cli-install)"
trap 'rm -rf "$tmp_dir"' EXIT

installer_path="$tmp_dir/$installer_asset"
checksum_path="$tmp_dir/$installer_asset.sha256"

printf 'info: Downloading MegaETH MOSS CLI installer %s\n' "$version" >&2
download "$installer_url" "$installer_path" ||
  error "failed to download $installer_url. This release may not include the release-owned installer asset yet."
download "$checksum_url" "$checksum_path" ||
  error "failed to download $checksum_url"

expected_checksum="$(awk '{print $1}' "$checksum_path" | head -n 1)"
actual_checksum="$(sha256_file "$installer_path")"
[ "$expected_checksum" = "$actual_checksum" ] ||
  error "checksum mismatch for $installer_asset"

sh "$installer_path" "$@"