#!/usr/bin/env bash
# PeerFold installer — macOS and Linux. Fetches the latest GitHub release.
set -euo pipefail

REPO="vincenzoml/PeerFold"
BASE_URL="https://github.com/${REPO}/releases/latest/download"

_PEERFOLD_TMP=""
_PEERFOLD_MOUNT=""

if ! command -v curl >/dev/null 2>&1; then
  echo "PeerFold install requires curl." >&2
  exit 1
fi

_peerfold_latest_tag() {
  local api="https://api.github.com/repos/${REPO}/releases/latest"
  local tag=""
  if command -v python3 >/dev/null 2>&1; then
    tag="$(curl -fsSL "${api}" | python3 -c 'import json,sys; print(json.load(sys.stdin).get("tag_name",""))' 2>/dev/null || true)"
  else
    tag="$(curl -fsSL "${api}" | sed -n 's/.*"tag_name"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' | head -1 || true)"
  fi
  printf '%s' "${tag}"
}

_peerfold_cleanup() {
  if [[ -n "${_PEERFOLD_MOUNT}" && -d "${_PEERFOLD_MOUNT}/PeerFold.app" ]]; then
    hdiutil detach "${_PEERFOLD_MOUNT}" -quiet 2>/dev/null || true
  fi
  if [[ -n "${_PEERFOLD_TMP}" && -d "${_PEERFOLD_TMP}" ]]; then
    rm -rf "${_PEERFOLD_TMP}"
  fi
  _PEERFOLD_MOUNT=""
  _PEERFOLD_TMP=""
}

download_file() {
  local dest="$1"
  local url="$2"
  local label="${3:-$(basename "${url}")}"
  echo "Fetching ${label}…"
  if [[ -t 2 ]]; then
    curl -fL --progress-bar -o "${dest}" "${url}"
    echo ""
  else
    curl -fsSL -o "${dest}" "${url}"
  fi
}

OS="$(uname -s)"

install_macos() {
  if ! command -v hdiutil >/dev/null 2>&1; then
    echo "PeerFold macOS install requires hdiutil." >&2
    exit 1
  fi

  local dest apps_dir
  _PEERFOLD_TMP="$(mktemp -d)"
  _PEERFOLD_MOUNT="${_PEERFOLD_TMP}/mount"
  mkdir -p "${_PEERFOLD_MOUNT}"
  trap _peerfold_cleanup EXIT

  local artifact="peerfold-macos.dmg"
  local tag="$(_peerfold_latest_tag)"
  local label="${artifact}"
  if [[ -n "${tag}" ]]; then
    label="${artifact} (${tag})"
  fi
  echo "Downloading PeerFold for macOS…"
  download_file "${_PEERFOLD_TMP}/peerfold.dmg" "${BASE_URL}/${artifact}" "${label}"

  echo "Mounting disk image…"
  hdiutil attach -nobrowse -quiet -mountpoint "${_PEERFOLD_MOUNT}" "${_PEERFOLD_TMP}/peerfold.dmg"

  if [[ ! -d "${_PEERFOLD_MOUNT}/PeerFold.app" ]]; then
    echo "PeerFold.app not found in disk image." >&2
    exit 1
  fi

  if [[ -w /Applications ]]; then
    apps_dir="/Applications"
  else
    apps_dir="${HOME}/Applications"
    mkdir -p "${apps_dir}"
  fi
  dest="${apps_dir}/PeerFold.app"
  echo "Installing to ${dest}…"
  rm -rf "${dest}"
  ditto "${_PEERFOLD_MOUNT}/PeerFold.app" "${dest}"
  touch "${dest}"
  xattr -dr com.apple.quarantine "${dest}" 2>/dev/null || true

  echo "Unmounting disk image…"
  _peerfold_cleanup
  trap - EXIT

  echo "Registering PeerFold for PDF files…"
  /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister \
    -f -trusted "${dest}"
  touch "${dest}/Contents/Resources/PeerFold.icns" 2>/dev/null || true

  echo "Installed PeerFold to ${dest}"
  open -R "${dest}"
  echo "PeerFold is selected in Finder — use Open With on a PDF, or double-click the app."
}

install_linux() {
  local bin_dir dest
  bin_dir="${PEERFOLD_BIN_DIR:-${HOME}/.local/bin}"
  mkdir -p "${bin_dir}"
  dest="${bin_dir}/peerfold"

  local artifact="peerfold-linux"
  local tag="$(_peerfold_latest_tag)"
  local label="${artifact}"
  if [[ -n "${tag}" ]]; then
    label="${artifact} (${tag})"
  fi
  echo "Downloading PeerFold for Linux…"
  download_file "${dest}" "${BASE_URL}/${artifact}" "${label}"
  chmod +x "${dest}"

  echo "Installed peerfold to ${dest}"
  case ":${PATH}:" in
    *":${bin_dir}:"*) ;;
    *)
      echo "Add to your shell profile: export PATH=\"${bin_dir}:\$PATH\""
      ;;
  esac
  desktop_dir="${XDG_DATA_HOME:-${HOME}/.local/share}/applications"
  mkdir -p "${desktop_dir}"
  cat >"${desktop_dir}/peerfold.desktop" <<EOF
[Desktop Entry]
Type=Application
Name=PeerFold
GenericName=PDF Review
Comment=Review PDFs with standard highlight annotations
Exec=${dest} %f
Terminal=false
MimeType=application/pdf;
Categories=Office;Viewer;
EOF
  chmod 644 "${desktop_dir}/peerfold.desktop"
  if command -v update-desktop-database >/dev/null 2>&1; then
    update-desktop-database "${desktop_dir}" >/dev/null 2>&1 || true
  fi
  echo "Run: peerfold manuscript.pdf --reviewer RB"
  echo "PeerFold should appear in Open With for PDF files."
}

case "${OS}" in
  Darwin) install_macos ;;
  Linux) install_linux ;;
  *)
    echo "Unsupported OS: ${OS}" >&2
    echo "Try pipx: pipx install peerfold-review" >&2
    exit 1
    ;;
esac