#!/usr/bin/env bash
# Build qroissant wheels via Docker. Both Linux and Windows builds run inside
# the qroissant-build:latest image (defined in scripts/Dockerfile.build) so the
# host needs only Docker + Python.
#
# Usage:
#   scripts/build.sh image            Build the qroissant-build Docker image.
#   scripts/build.sh linux            Build a manylinux x86_64 wheel -> dist-linux/
#   scripts/build.sh windows          Build a win_amd64 wheel        -> dist-windows/
#   scripts/build.sh all              image + linux + windows.
#   scripts/build.sh check            Install the latest linux wheel into .venv
#                                     and import qroissant as a smoke test.
#   scripts/build.sh clean            Remove dist-*/ output dirs (volumes kept).
#   scripts/build.sh clean-cache      Also drop the Docker volumes (cargo
#                                     registry, target dir, xwin SDK cache).

set -euo pipefail

SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
ROOT_DIR=$(cd -- "$SCRIPT_DIR/.." &>/dev/null && pwd)
cd "$ROOT_DIR"

IMAGE=qroissant-build:latest
VOL_CARGO=qroissant-cargo-registry
VOL_TARGET=qroissant-target
VOL_XWIN=qroissant-xwin

need_docker() {
  command -v docker >/dev/null 2>&1 || {
    echo "error: docker is required but not on PATH" >&2
    exit 1
  }
}

ensure_volumes() {
  local uid gid
  uid=$(id -u); gid=$(id -g)
  for v in "$VOL_CARGO" "$VOL_TARGET" "$VOL_XWIN"; do
    if ! docker volume inspect "$v" >/dev/null 2>&1; then
      docker volume create "$v" >/dev/null
    fi
    # Re-chown the volume to the invoking user every run; cheap and idempotent.
    docker run --rm -v "$v":/v --entrypoint=sh "$IMAGE" -c "chown -R $uid:$gid /v" >/dev/null
  done
}

ensure_image() {
  if ! docker image inspect "$IMAGE" >/dev/null 2>&1; then
    echo ">>> building $IMAGE"
    docker build -t "$IMAGE" -f "$SCRIPT_DIR/Dockerfile.build" "$SCRIPT_DIR"
  fi
}

run_in_image() {
  # Run as the invoking user so produced wheels are owned by them, not root.
  # CARGO_HOME / XDG_CACHE_HOME are redirected into the persistent volumes,
  # which must therefore be owned by the same uid (handled by ensure_volumes).
  docker run --rm \
    --user "$(id -u):$(id -g)" \
    -e CARGO_HOME=/cargo \
    -e XDG_CACHE_HOME=/xdg-cache \
    -e HOME=/tmp \
    -e XWIN_ACCEPT_LICENSE=1 \
    -v "$ROOT_DIR":/io -w /io \
    -v "$VOL_CARGO":/cargo \
    -v "$VOL_TARGET":/io/target \
    -v "$VOL_XWIN":/xdg-cache/cargo-xwin \
    --entrypoint=sh \
    "$IMAGE" -c "$1"
}

cmd_image() {
  need_docker
  echo ">>> (re)building $IMAGE"
  docker build -t "$IMAGE" -f "$SCRIPT_DIR/Dockerfile.build" "$SCRIPT_DIR"
}

cmd_linux() {
  need_docker
  ensure_image
  ensure_volumes
  echo ">>> building Linux wheel -> dist-linux/"
  run_in_image 'maturin build --release --out /io/dist-linux'
  ls -1 dist-linux/*.whl
}

cmd_windows() {
  need_docker
  ensure_image
  ensure_volumes
  echo ">>> building Windows wheel -> dist-windows/"
  run_in_image '
    maturin build --release --target x86_64-pc-windows-msvc --out /io/dist-windows
    # Copy the PDB next to the wheel when one was produced (release profile
    # has debug = "line-tables-only"). Place it next to _native.pyd at
    # runtime on Windows to get resolved panic backtraces.
    pdb=$(find /io/target/x86_64-pc-windows-msvc/release -maxdepth 2 -name "_native.pdb" 2>/dev/null | head -1)
    if [ -n "$pdb" ]; then
      cp "$pdb" /io/dist-windows/
      echo "+ copied $(basename "$pdb") -> dist-windows/"
    fi
  '
  ls -1 dist-windows/
}

cmd_check() {
  local venv="$ROOT_DIR/.venv"
  if [[ ! -x "$venv/bin/python" ]]; then
    echo ">>> creating venv at $venv"
    python3 -m venv "$venv"
    "$venv/bin/pip" install --quiet --upgrade pip
  fi
  local wheel
  wheel=$(ls -t dist-linux/qroissant-*-linux*.whl dist-linux/qroissant-*-manylinux*.whl 2>/dev/null | head -1 || true)
  if [[ -z "$wheel" ]]; then
    echo "error: no Linux wheel in dist-linux/; run '$0 linux' first" >&2
    exit 1
  fi
  echo ">>> installing $wheel"
  "$venv/bin/pip" install --quiet --force-reinstall "$wheel"
  "$venv/bin/python" -c 'import qroissant; print("ok: qroissant", qroissant.__version__ if hasattr(qroissant, "__version__") else "(no __version__)")'
  if [[ -f dist-windows/qroissant-*-win_amd64.whl ]] 2>/dev/null || ls dist-windows/qroissant-*-win_amd64.whl >/dev/null 2>&1; then
    echo ">>> inspecting Windows wheel"
    for w in dist-windows/qroissant-*-win_amd64.whl; do
      python3 -m zipfile -l "$w" | grep -E '_native\.pyd|WHEEL' || true
    done
  fi
}

cmd_clean() {
  rm -rf dist-linux dist-windows
  echo ">>> removed dist-linux/ dist-windows/"
}

cmd_clean_cache() {
  cmd_clean
  for v in "$VOL_CARGO" "$VOL_TARGET" "$VOL_XWIN"; do
    docker volume rm "$v" >/dev/null 2>&1 && echo ">>> removed volume $v" || true
  done
}

case "${1:-}" in
  image)        cmd_image ;;
  linux)        cmd_linux ;;
  windows)      cmd_windows ;;
  all)          cmd_image; cmd_linux; cmd_windows ;;
  check)        cmd_check ;;
  clean)        cmd_clean ;;
  clean-cache)  cmd_clean_cache ;;
  ""|-h|--help)
    sed -n '2,/^set -euo/p' "${BASH_SOURCE[0]}" | sed 's/^# \{0,1\}//' | sed '/^set -euo/d'
    ;;
  *)
    echo "error: unknown command: $1" >&2
    echo "run '$0 --help' for usage" >&2
    exit 2
    ;;
esac