#!/usr/bin/env bash
# Wrap dist/DataTools/ (PyInstaller folder mode) into a distributable
# AppImage.
#
# Usage:
#   bash build/appimage/build.sh <version>
#
# Requires ``appimagetool`` on PATH (CI installs it; locally grab the
# latest release from https://github.com/AppImage/AppImageKit/releases).
#
# Output: dist/DataTools-<version>-linux-x86_64.AppImage

set -euo pipefail

VERSION="${1:-0.0.0-dev}"
DIST="dist/DataTools"
OUT="dist/DataTools-${VERSION}-linux-x86_64.AppImage"

if [[ ! -d "$DIST" ]]; then
  echo "Error: $DIST not found. Run pyinstaller build/datatools.spec first." >&2
  exit 1
fi

if ! command -v appimagetool >/dev/null 2>&1; then
  echo "Error: appimagetool not on PATH. See build/appimage/build.sh header." >&2
  exit 1
fi

# Lay out the AppDir.
APPDIR="$(mktemp -d)/DataTools.AppDir"
trap 'rm -rf "$(dirname -- "$APPDIR")"' EXIT
mkdir -p "$APPDIR/usr/bin"

cp -R "$DIST" "$APPDIR/usr/bin/"
cp build/appimage/AppRun "$APPDIR/AppRun"
chmod +x "$APPDIR/AppRun"
cp build/appimage/datatools.desktop "$APPDIR/datatools.desktop"

# Icon. AppImage requires a top-level <appname>.png next to the
# .desktop. Use the build/icon.png if present, otherwise generate a
# blank placeholder so the build doesn't fail on a fresh checkout.
if [[ -f build/icon.png ]]; then
  cp build/icon.png "$APPDIR/datatools.png"
else
  # 256x256 single-colour PNG via printf — appimagetool needs *some*
  # icon present. Replace with a real 1024x1024 PNG before launch.
  python3 - <<'PY'
import struct, zlib, os
def chunk(t, d): return struct.pack(">I", len(d)) + t + d + struct.pack(">I", zlib.crc32(t + d) & 0xffffffff)
W = H = 256
ihdr = struct.pack(">IIBBBBB", W, H, 8, 2, 0, 0, 0)  # 8-bit RGB
raw = b"".join(b"\x00" + b"\x16\x19\x22" * W for _ in range(H))  # filter byte + dark pixels
idat = zlib.compress(raw, 9)
png = b"\x89PNG\r\n\x1a\n" + chunk(b"IHDR", ihdr) + chunk(b"IDAT", idat) + chunk(b"IEND", b"")
out = os.environ["APPDIR"] + "/datatools.png"
open(out, "wb").write(png)
PY
fi
export APPDIR

ARCH=x86_64 appimagetool "$APPDIR" "$OUT"
echo "Built $OUT"