#!/bin/bash
# Installs CoScribe 2.1.0 on Linux (x86_64) for this user, no sudo needed:
#   curl -fsSL https://coscribe.anthony-tong.com/install-linux.sh | bash
#   curl -fsSL https://coscribe.anthony-tong.com/install-linux.sh | bash -s -- --uninstall
# Puts the AppImage in ~/Applications (it updates itself there), a `coscribe` command in ~/.local/bin,
# and a menu entry; MuseScore files (.mscz, .mscx) list it under "Open with" (MuseScore stays their default).
set -euo pipefail

UNINSTALL=0
for arg in "$@"; do
  case "$arg" in
    --uninstall) UNINSTALL=1 ;;
    *) echo "Unknown option: $arg (did you mean --uninstall?)" >&2; exit 1 ;;
  esac
done

APPDIR="$HOME/Applications"
APP="$APPDIR/CoScribe.AppImage"
BIN="$HOME/.local/bin/coscribe"
DATA="${XDG_DATA_HOME:-$HOME/.local/share}"
DESKTOP="$DATA/applications/coscribe.desktop"
MIMEXML="$DATA/mime/packages/coscribe.xml"
ICON="$DATA/icons/hicolor/256x256/apps/coscribe.png"

refresh() {
  command -v update-mime-database >/dev/null && update-mime-database "$DATA/mime" >/dev/null 2>&1 || true
  command -v update-desktop-database >/dev/null && update-desktop-database "$DATA/applications" >/dev/null 2>&1 || true
}

if [ "$UNINSTALL" = 1 ]; then
  rm -f "$APP" "$BIN" "$DESKTOP" "$MIMEXML" "$ICON"
  refresh
  echo "Removed CoScribe. Your scores, and settings in ~/.config/CoScribe, are left where they are."
  exit 0
fi

if [ "$(uname -m)" != x86_64 ]; then
  echo "CoScribe for Linux is built for x86_64 only (this is $(uname -m))." >&2; exit 1
fi
if pgrep -f "$APP" >/dev/null 2>&1; then
  echo "CoScribe is running. Quit it and run this again." >&2; exit 1
fi

BASE="https://dl.anthony-tong.com/coscribe"
FILE="CoScribe-2.1.0-linux-x86_64.AppImage"
SHA="e77fa985f5d7bd7fbb3048d6961d47ce7fecf83be17442b8902567eaa1da4ee6"
TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT

echo "Downloading CoScribe 2.1.0 for Linux..."
curl -fL --progress-bar -o "$TMP/$FILE" "$BASE/$FILE"
echo "$SHA  $TMP/$FILE" | sha256sum -c - >/dev/null || { echo "Download is corrupt (checksum mismatch). Try again." >&2; exit 1; }
chmod +x "$TMP/$FILE"
mkdir -p "$APPDIR" "$(dirname "$BIN")" "$(dirname "$DESKTOP")" "$(dirname "$MIMEXML")" "$(dirname "$ICON")"
mv -f "$TMP/$FILE" "$APP"
# the same app from before it was called CoScribe
rm -f "$APPDIR/Engrave.AppImage" "$HOME/.local/bin/engrave" "$DATA/applications/engrave.desktop" "$DATA/mime/packages/engrave.xml"

# How to start it here:
# - Chromium's sandbox needs user namespaces in an AppImage (the .deb package has a setuid helper instead).
#   Ubuntu 23.10+ restricts them, and some systems turn them off; then the app only starts with --no-sandbox.
# - AppImages mount themselves with FUSE; without libfuse2 they can unpack and run instead (slower start).
FLAGS=""
ENVS=""
if [ "$(cat /proc/sys/kernel/apparmor_restrict_unprivileged_userns 2>/dev/null || echo 0)" = 1 ] || ! unshare -Ur true >/dev/null 2>&1; then
  FLAGS="--no-sandbox"
  NOTE_SANDBOX=1
fi
if ! { ldconfig -p 2>/dev/null || /sbin/ldconfig -p 2>/dev/null || true; } | grep -q 'libfuse\.so\.2' && ! ls /lib*/libfuse.so.2 /usr/lib*/libfuse.so.2 /lib/*-linux-gnu/libfuse.so.2 /usr/lib/*-linux-gnu/libfuse.so.2 >/dev/null 2>&1; then
  ENVS="APPIMAGE_EXTRACT_AND_RUN=1 "
  NOTE_FUSE=1
fi
cat > "$BIN" <<EOF
#!/bin/sh
# Starts CoScribe (installed by install-linux.sh). The AppImage at $APP updates itself.
exec env ${ENVS}"$APP" ${FLAGS} "\$@"
EOF
chmod +x "$BIN"

# Icon: the one inside the AppImage, if it can be read.
( cd "$TMP" && "$APP" --appimage-extract '*.png' >/dev/null 2>&1 && cp "$(ls -S squashfs-root/*.png 2>/dev/null | head -1)" "$ICON" ) 2>/dev/null || true
ICON_NAME=coscribe
[ -f "$ICON" ] || ICON_NAME=audio-x-generic

# MuseScore's file types, in case MuseScore (an AppImage, say) didn't set them up

cat > "$MIMEXML" <<'EOF'
<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
  <mime-type type="application/x-musescore">
    <comment>MuseScore score</comment>
    <glob pattern="*.mscz"/>
  </mime-type>
  <mime-type type="application/x-musescore+xml">
    <comment>MuseScore score (uncompressed)</comment>
    <sub-class-of type="application/xml"/>
    <glob pattern="*.mscx"/>
  </mime-type>
  <mime-type type="application/x-coscribe">
    <comment>CoScribe project</comment>
    <sub-class-of type="application/json"/>
    <glob pattern="*.coscribe"/>
  </mime-type>
</mime-info>
EOF
cat > "$DESKTOP" <<EOF
[Desktop Entry]
Type=Application
Name=CoScribe
Comment=Shared MuseScore projects and automatic part formatting
Exec="$BIN" %U
Icon=$ICON_NAME
Terminal=false
Categories=AudioVideo;Audio;
Keywords=music;score;musescore;engraving;parts;
StartupWMClass=CoScribe
MimeType=application/x-musescore;application/x-musescore+xml;application/x-coscribe;x-scheme-handler/coscribe;
EOF
refresh
command -v xdg-mime >/dev/null && { xdg-mime default coscribe.desktop x-scheme-handler/coscribe; xdg-mime default coscribe.desktop application/x-coscribe; } >/dev/null 2>&1 || true

echo "Installed CoScribe 2.1.0 to $APP"
case ":$PATH:" in *":$HOME/.local/bin:"*) ;; *) echo "Add ~/.local/bin to your PATH to start it with the coscribe command (it is in your app menu either way)." ;; esac
[ -n "${NOTE_SANDBOX:-}" ] && echo "Note: this system restricts the sandbox AppImages use, so CoScribe runs without it. The .deb package from the download page keeps it."
[ -n "${NOTE_FUSE:-}" ] && echo "Note: libfuse2 isn't installed, so CoScribe unpacks itself on each start (a few seconds). Install libfuse2 (Ubuntu: sudo apt install libfuse2t64) for a quicker start."
command -v mscore4portable mscore musescore mscore4 >/dev/null 2>&1 || ls "$HOME"/Applications/MuseScore*.AppImage "$HOME"/Downloads/MuseScore*.AppImage >/dev/null 2>&1 || flatpak info org.musescore.MuseScore >/dev/null 2>&1 || [ -x /snap/bin/musescore ] \
  || echo "CoScribe uses MuseScore Studio 4 (free, https://musescore.org/download) to measure and export; install it, or point to it in Settings → MuseScore."
if [ -n "${DISPLAY:-}${WAYLAND_DISPLAY:-}" ]; then
  nohup "$BIN" >/dev/null 2>&1 &
fi