setup

#!/usr/bin/env bash
set -euo pipefail

prepare_installer() {
  echo "Initializing installer..."
  SSI_VERSION="0.1.9"

  # Set up tmp dir where all work is done
  tmpdir="$(mktemp -d)"
  trap 'rm -rf "$tmpdir"' EXIT
  cd "$tmpdir"
  export PATH="$tmpdir:$PATH"

  # Download ssi if needed
  if ! command -v ssi >/dev/null 2>&1 || [ "$(ssi --version 2>/dev/null)" != "$SSI_VERSION" ]; then
    if command -v curl >/dev/null 2>&1; then
      curl -fSsL https://github.com/DannyBen/ssi/releases/download/v$SSI_VERSION/ssi -o ssi
    elif command -v wget >/dev/null 2>&1; then
      wget -nv -O ssi https://github.com/DannyBen/ssi/releases/download/v$SSI_VERSION/ssi
    else
      echo "Error: please install wget or curl, then try again" >&2
      exit 1
    fi
    chmod +x ssi
  fi
}

github_latest_tag() {
  local body

  if command -v curl >/dev/null 2>&1; then
    body="$(curl -fSsL https://api.github.com/repos/DannyBen/eget/releases/latest)"
  else
    body="$(wget -qO- https://api.github.com/repos/DannyBen/eget/releases/latest)"
  fi

  printf "%s\n" "$body" | sed -n 's/.*"tag_name":[[:space:]]*"v\([^"]*\)".*/\1/p' | head -n 1
}

detect_platform() {
  local os machine

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

  case "$os" in
    linux)
      case "$machine" in
        arm64*|aarch64*) printf "linux_arm64\n" ;;
        *64) printf "linux_amd64\n" ;;
      esac
      ;;
    darwin)
      case "$machine" in
        arm64*|aarch64*) printf "darwin_arm64\n" ;;
        *64) printf "darwin_amd64\n" ;;
      esac
      ;;
  esac
}

prepare_installer

platform="${GETEGET_PLATFORM:-$(detect_platform)}"
if [[ -z "${platform:-}" ]]; then
  cat <<'EOF'
Could not detect a supported platform automatically.
Set GETEGET_PLATFORM and rerun this script.

Supported values:
- linux_amd64
- linux_arm64
- darwin_amd64
- darwin_arm64
EOF
  exit 1
fi

tag="$(github_latest_tag)"
if [[ -z "$tag" ]]; then
  echo "Error: unable to determine the latest eget release tag" >&2
  exit 1
fi

extension="tar.gz"
binary_name="eget"

archive_name="eget-${tag}-${platform}.${extension}"
download_url="https://github.com/DannyBen/eget/releases/download/v${tag}/${archive_name}"

ssi log info "Installing eget ${tag} for ${platform}"
ssi log debug "Downloading ${download_url}"

if command -v curl >/dev/null 2>&1; then
  curl -fSsL "$download_url" -o "$archive_name"
else
  wget -nv -O "$archive_name" "$download_url"
fi

tar -xzf "$archive_name"

ssi install bin "${binary_name}" --name "$binary_name"

if [[ -f "eget.1" ]]; then
  ssi install man "eget.1"
else
  ssi log warn "eget.1 not found in release archive; skipping man page install"
fi

if command -v eget >/dev/null 2>&1; then
  ssi log info "eget --version : $(eget --version)"
else
  ssi log warn "eget not found on PATH after install"
fi

ssi log debug "Installation complete"