#!/usr/bin/env bash
# Gizmo installer — served by the activation server at https://gizmo.e404.eu/
#
#   curl -sSL https://gizmo.e404.eu | bash
#
# Installs the Gizmo CLI as an isolated pipx app, then prints next steps. The
# wheel is pure-Python, so the same artifact serves every OS/arch; we still
# detect the platform for clear messaging and to pick the install location.
set -euo pipefail

BASE_URL="https://gizmo.e404.eu"
PACKAGE="gizmo"
WHEEL_URL="${BASE_URL}/releases/latest"

say()  { printf '\033[1;36m%s\033[0m\n' "$*"; }
warn() { printf '\033[1;33m%s\033[0m\n' "$*" >&2; }
die()  { printf '\033[1;31m%s\033[0m\n' "$*" >&2; exit 1; }

# --- detect platform (informational) --------------------------------------
OS="$(uname -s)"
ARCH="$(uname -m)"
case "$OS" in
  Linux)  PLATFORM="Linux" ;;
  Darwin) PLATFORM="macOS" ;;
  *) die "Unsupported OS: $OS (need Linux or macOS)" ;;
esac
case "$ARCH" in
  x86_64|amd64)  ARCHLABEL="x86_64" ;;
  arm64|aarch64) ARCHLABEL="ARM64" ;;
  *) warn "Unrecognized arch '$ARCH' — continuing (wheel is arch-independent)."; ARCHLABEL="$ARCH" ;;
esac
say "Installing Gizmo for ${PLATFORM} ${ARCHLABEL}…"

# --- ensure python3 -------------------------------------------------------
PYTHON="$(command -v python3 || true)"
[ -n "$PYTHON" ] || die "python3 not found. Install Python 3.10+ and re-run."

# --- ensure pipx ----------------------------------------------------------
PIPX=""
if command -v pipx >/dev/null 2>&1; then
  PIPX="pipx"
elif "$PYTHON" -m pipx --version >/dev/null 2>&1; then
  PIPX="$PYTHON -m pipx"
fi

if [ -z "$PIPX" ]; then
  say "pipx not found — trying to bootstrap it…"

  # Some distros (Debian/Ubuntu, incl. WSL) ship python3 without pip; try to
  # bootstrap pip via ensurepip first. (On Debian this is often disabled, in
  # which case pipx must come from the system package manager — handled below.)
  if ! "$PYTHON" -m pip --version >/dev/null 2>&1; then
    "$PYTHON" -m ensurepip --upgrade >/dev/null 2>&1 || true
  fi

  if "$PYTHON" -m pip --version >/dev/null 2>&1; then
    # pip available — install pipx into the user site (--break-system-packages
    # covers PEP 668 "externally-managed-environment" distros).
    "$PYTHON" -m pip install --user --quiet pipx 2>/dev/null \
      || "$PYTHON" -m pip install --user --quiet --break-system-packages pipx 2>/dev/null \
      || true
    "$PYTHON" -m pipx ensurepath >/dev/null 2>&1 || true
    export PATH="$("$PYTHON" -m site --user-base)/bin:$PATH"
    if command -v pipx >/dev/null 2>&1; then
      PIPX="pipx"
    elif "$PYTHON" -m pipx --version >/dev/null 2>&1; then
      PIPX="$PYTHON -m pipx"
    fi
  fi
fi

if [ -z "$PIPX" ]; then
  # Couldn't bootstrap without sudo — point the user at the one-liner for their
  # package manager (the apt/dnf pipx package also pulls in python3-venv, which
  # pipx needs to build the Gizmo venv).
  warn ""
  warn "Couldn't install pipx automatically. Install it with your package manager, then re-run:"
  if command -v apt-get >/dev/null 2>&1; then
    warn "    sudo apt update && sudo apt install -y pipx"
  elif command -v dnf >/dev/null 2>&1; then
    warn "    sudo dnf install -y pipx"
  elif command -v pacman >/dev/null 2>&1; then
    warn "    sudo pacman -S --noconfirm python-pipx"
  elif command -v zypper >/dev/null 2>&1; then
    warn "    sudo zypper install -y python3-pipx"
  elif command -v brew >/dev/null 2>&1; then
    warn "    brew install pipx"
  else
    warn "    (install the 'pipx' package via your OS package manager)"
  fi
  warn "    curl -sSL ${BASE_URL} | bash"
  die "pipx is required."
fi

# --- download then install the wheel -------------------------------------
# We download to a temp file rather than `pipx install "<pkg> @ <url>"`: pip
# names a direct-URL download from the URL basename, so a `/releases/latest`
# URL is saved as "latest" and rejected as "not a Python project". Fetching the
# file ourselves lets pip see a real `*.whl` name and recognize the wheel.
say "Fetching the Gizmo wheel from ${WHEEL_URL}…"
DL_DIR="$(mktemp -d)"
trap 'rm -rf "$DL_DIR"' EXIT
# /releases/latest 302-redirects to /releases/<name>.whl. Resolve that real URL
# first so curl -O names the saved file from a basename ending in .whl (curl -O
# otherwise uses the command-line URL basename, "latest", which pip rejects).
REAL_URL="$(curl -fsS -o /dev/null -w '%{redirect_url}' "$WHEEL_URL")"
[ -n "$REAL_URL" ] || REAL_URL="$WHEEL_URL"
( cd "$DL_DIR" && curl -fSL -O "$REAL_URL" ) || die "Failed to download the wheel."
WHEEL_FILE="$(ls "$DL_DIR"/*.whl 2>/dev/null | head -1)"
[ -n "$WHEEL_FILE" ] || die "Downloaded file is not a .whl — check ${WHEEL_URL}."

say "Installing ${WHEEL_FILE##*/}…"
$PIPX install --force "$WHEEL_FILE"

# Make sure pipx's bin dir is on PATH (idempotent; no-op if already added).
$PIPX ensurepath >/dev/null 2>&1 || true

echo
say "Gizmo installed."
echo "Next steps:"
echo "  1. Ensure the 'gizmo' command is on your PATH — run this once, then open a new terminal:"
echo
echo "       pipx ensurepath"
echo
echo "  2. Run:  gizmo"
echo "     On first run you'll be guided through a one-time browser activation."