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

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
APPIMAGE_ROOT="${ROOT_DIR}/appimage"
BUILD_DIR="${APPIMAGE_ROOT}/build"
APPDIR="${BUILD_DIR}/AppDir"
DIST_DIR="${APPIMAGE_ROOT}/dist"

APPIMAGE_BUILDER_BIN="${APPIMAGE_BUILDER_BIN:-appimage-builder}"

for cmd in uv "${APPIMAGE_BUILDER_BIN}"; do
    if ! command -v "${cmd}" >/dev/null 2>&1; then
        echo "Missing required command: ${cmd}" >&2
        echo "See docs/appimage.md for setup instructions." >&2
        exit 1
    fi
done

mkdir -p "${BUILD_DIR}" "${DIST_DIR}"
rm -rf "${APPDIR}"
mkdir -p "${APPDIR}"

cd "${ROOT_DIR}"
uv export \
  --frozen \
  --no-dev \
  --no-emit-project \
  --format requirements-txt \
  --output-file "${BUILD_DIR}/requirements.txt"
# Remove stale wheels from previous versions so a version-specific lookup
# below cannot accidentally pick up an outdated build artifact.
rm -f "${BUILD_DIR}"/scanslicer-*.whl
uv build --wheel --out-dir "${BUILD_DIR}"

# Select the wheel matching the project version from pyproject.toml. Listing
# with `ls` and taking the first result breaks once an older wheel for a
# previous version is left in the build dir, because `ls` sorts
# alphabetically and would pick the stale artifact.
PROJECT_VERSION="$(sed -n 's/^version *= *"\([^"]*\)".*/\1/p' "${ROOT_DIR}/pyproject.toml" | head -n 1)"
if [[ -z "${PROJECT_VERSION}" ]]; then
    echo "Could not determine project version from pyproject.toml" >&2
    exit 1
fi
WHEEL_PATH="${BUILD_DIR}/scanslicer-${PROJECT_VERSION}-py3-none-any.whl"
if [[ ! -f "${WHEEL_PATH}" ]]; then
    echo "Could not find built wheel for version ${PROJECT_VERSION} in ${BUILD_DIR}" >&2
    echo "Found wheels:" >&2
    ls -1 "${BUILD_DIR}"/scanslicer-*.whl >&2 || true
    exit 1
fi

export SCANSLICER_ROOT="${ROOT_DIR}"
export SCANSLICER_APPDIR="${APPDIR}"
export SCANSLICER_REQUIREMENTS="${BUILD_DIR}/requirements.txt"
export SCANSLICER_WHEEL="${WHEEL_PATH}"

cd "${BUILD_DIR}"
"${APPIMAGE_BUILDER_BIN}" --recipe "${ROOT_DIR}/packaging/appimage/AppImageBuilder.yml"

mkdir -p "${DIST_DIR}"
find "${BUILD_DIR}" -maxdepth 1 -type f \( -name "*.AppImage" -o -name "*.zsync" \) -exec mv -f {} "${DIST_DIR}/" \;

echo "AppImage build complete. Output in ${DIST_DIR}"