#!/usr/bin/env bash
# Build a "thin" PixelPass AppImage: the gui-enabled release binary plus only
# its non-excludelisted shared libraries. The graphics stack (libGL, wayland,
# xkbcommon, X11) is intentionally left to the host — those libs are on the
# AppImage excludelist because they must match the host driver — and the
# runtime tools PixelPass shells out to (gst-launch-1.0, pactl, mpv/vlc) are
# expected on the host PATH, the same contract the Arch package documents.
#
# Usage: packaging/appimage/build-appimage.sh
# Output: packaging/appimage/pixelpass-x86_64.AppImage
set -euo pipefail

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
repo="$(cd "$here/../.." && pwd)"
tools="$here/.tools"
appdir="$here/AppDir"
mkdir -p "$tools"

# linuxdeploy is itself an AppImage; run it without FUSE so this works on hosts
# (and CI) that lack libfuse2.
export APPIMAGE_EXTRACT_AND_RUN=1
# Embed the version from Cargo.toml into the AppImage filename metadata.
VERSION="$(grep -m1 '^version' "$repo/Cargo.toml" | sed -E 's/.*"(.*)".*/\1/')"
export VERSION

echo ">> building release binary (--features gui)"
( cd "$repo" && cargo build --release --features gui )
# Honour CARGO_TARGET_DIR so an isolated build (e.g. inside an old-glibc
# distrobox) doesn't have to clobber the host's target/.
bin="${CARGO_TARGET_DIR:-$repo/target}/release/pixelpass"

echo ">> fetching linuxdeploy"
ld="$tools/linuxdeploy-x86_64.AppImage"
if [ ! -x "$ld" ]; then
  curl -fL --retry 3 -o "$ld" \
    "https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage"
  chmod +x "$ld"
fi

echo ">> assembling AppDir"
rm -rf "$appdir"
mkdir -p "$appdir/usr/bin"
install -m755 "$bin" "$appdir/usr/bin/pixelpass"

echo ">> running linuxdeploy (bundles libs, builds the AppImage)"
# -e: analyse this binary for libraries to bundle (only libpipewire et al. that
#     aren't excludelisted will be copied; glibc + graphics libs are skipped).
# -d/-i: desktop entry + icon for desktop integration.
# --custom-apprun: our launcher that opens --gui from a file manager.
( cd "$here" && OUTPUT="pixelpass-${VERSION}-x86_64.AppImage" "$ld" \
    --appdir "$appdir" \
    -e "$bin" \
    -d "$repo/assets/pixelpass.desktop" \
    -i "$repo/assets/pixelpass-256.png" \
    --icon-filename pixelpass \
    --custom-apprun "$here/AppRun" \
    --output appimage )

echo ">> done: $here/pixelpass-${VERSION}-x86_64.AppImage"