#!/usr/bin/env bash
# build-appimage.sh — package a php-qml app as a single-file Linux
# AppImage using linuxdeploy + linuxdeploy-plugin-qt.
#
# Usage:
#   build-appimage.sh \
#       --app-name todo \
#       --host-binary build/qml/todo \
#       --symfony-dir symfony \
#       --frankenphp /usr/local/bin/frankenphp \
#       --caddyfile Caddyfile \
#       --desktop packaging/todo.desktop \
#       --icon packaging/todo.png \
#       --output build/Todo-x86_64.AppImage
#
# Layout produced inside the AppImage:
#   AppDir/usr/bin/<app-name>        — Qt host
#   AppDir/usr/bin/frankenphp        — bundled FrankenPHP
#   AppDir/usr/share/<app-name>/symfony/   — Composer-installed app
#   AppDir/usr/share/<app-name>/Caddyfile  — bundled Caddy config
#   AppDir/usr/lib/...               — Qt + system deps (linuxdeploy)
#
# BackendConnection's resolve* methods already look in
# applicationDirPath()/../share/<app>/... so this layout works.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
TOOLS_DIR="$SCRIPT_DIR/tools"

APP_NAME=""
HOST_BIN=""
SYMFONY_DIR=""
FRANKENPHP=""
CADDYFILE=""
DESKTOP=""
ICON=""
OUTPUT=""

usage() {
    cat <<USAGE >&2
Usage: $0 \\
    --app-name <name> \\
    --host-binary <path> \\
    --symfony-dir <path> \\
    --frankenphp <path> \\
    --caddyfile <path> \\
    --desktop <path> \\
    --icon <path> \\
    --output <path.AppImage>
USAGE
    exit 1
}

while [ $# -gt 0 ]; do
    case "$1" in
        --app-name)     APP_NAME="$2"; shift 2 ;;
        --host-binary)  HOST_BIN="$2"; shift 2 ;;
        --symfony-dir)  SYMFONY_DIR="$2"; shift 2 ;;
        --frankenphp)   FRANKENPHP="$2"; shift 2 ;;
        --caddyfile)    CADDYFILE="$2"; shift 2 ;;
        --desktop)      DESKTOP="$2"; shift 2 ;;
        --icon)         ICON="$2"; shift 2 ;;
        --output)       OUTPUT="$2"; shift 2 ;;
        -h|--help)      usage ;;
        *)              echo "unknown arg: $1" >&2; usage ;;
    esac
done

for v in APP_NAME HOST_BIN SYMFONY_DIR FRANKENPHP CADDYFILE DESKTOP ICON OUTPUT; do
    [ -n "${!v}" ] || { echo "missing --${v,,}" >&2; usage; }
done

# Resolve to absolute paths so a `cd` later doesn't break references.
HOST_BIN="$(readlink -f "$HOST_BIN")"
SYMFONY_DIR="$(readlink -f "$SYMFONY_DIR")"
FRANKENPHP="$(readlink -f "$FRANKENPHP")"
CADDYFILE="$(readlink -f "$CADDYFILE")"
DESKTOP="$(readlink -f "$DESKTOP")"
ICON="$(readlink -f "$ICON")"
OUTPUT_DIR="$(dirname "$OUTPUT")"
mkdir -p "$OUTPUT_DIR"
OUTPUT="$(readlink -f "$OUTPUT_DIR")/$(basename "$OUTPUT")"

[ -x "$HOST_BIN" ]    || { echo "host binary not executable: $HOST_BIN" >&2; exit 1; }
[ -d "$SYMFONY_DIR" ] || { echo "symfony dir missing: $SYMFONY_DIR"     >&2; exit 1; }
[ -x "$FRANKENPHP" ]  || { echo "frankenphp not executable: $FRANKENPHP" >&2; exit 1; }
[ -f "$CADDYFILE" ]   || { echo "caddyfile missing: $CADDYFILE"          >&2; exit 1; }
[ -f "$DESKTOP" ]     || { echo "desktop file missing: $DESKTOP"         >&2; exit 1; }
[ -f "$ICON" ]        || { echo "icon missing: $ICON"                    >&2; exit 1; }

mkdir -p "$TOOLS_DIR"

step() { echo "==> $*"; }

# ── Tooling ───────────────────────────────────────────────────────────
LD="$TOOLS_DIR/linuxdeploy-x86_64.AppImage"
LD_QT="$TOOLS_DIR/linuxdeploy-plugin-qt-x86_64.AppImage"
APPIMAGETOOL="$TOOLS_DIR/appimagetool-x86_64.AppImage"

if [ ! -x "$LD" ]; then
    step "Download linuxdeploy"
    curl -fsSL -o "$LD" \
        https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
    chmod +x "$LD"
fi
if [ ! -x "$LD_QT" ]; then
    step "Download linuxdeploy-plugin-qt"
    curl -fsSL -o "$LD_QT" \
        https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage
    chmod +x "$LD_QT"
fi
if [ ! -x "$APPIMAGETOOL" ]; then
    step "Download appimagetool"
    curl -fsSL -o "$APPIMAGETOOL" \
        https://github.com/AppImage/appimagetool/releases/download/continuous/appimagetool-x86_64.AppImage
    chmod +x "$APPIMAGETOOL"
fi
# Pre-cache the runtime file appimagetool needs; downloading it on every
# build was wedging some networks during squashfs.
RUNTIME_FILE="$TOOLS_DIR/runtime-x86_64"
if [ ! -f "$RUNTIME_FILE" ]; then
    step "Download AppImage runtime"
    curl -fsSL -o "$RUNTIME_FILE" \
        https://github.com/AppImage/type2-runtime/releases/download/continuous/runtime-x86_64
fi

# Some sandboxed CI images can't run AppImage's FUSE mount. Allow the
# user to pre-extract them and skip the FUSE machinery via env hint.
export APPIMAGE_EXTRACT_AND_RUN="${APPIMAGE_EXTRACT_AND_RUN:-1}"

# ── Stage AppDir ──────────────────────────────────────────────────────
APPDIR="$(mktemp -d)/AppDir"
trap 'rm -rf "$(dirname "$APPDIR")"' EXIT INT TERM

step "Stage AppDir at $APPDIR"
mkdir -p "$APPDIR/usr/bin" "$APPDIR/usr/share/$APP_NAME"
install -m 0755 "$HOST_BIN"   "$APPDIR/usr/bin/$APP_NAME"
install -m 0755 "$FRANKENPHP" "$APPDIR/usr/bin/frankenphp"
install -m 0644 "$CADDYFILE"  "$APPDIR/usr/share/$APP_NAME/Caddyfile"

# Symfony tree: rsync without dev artefacts. Ensure composer ran with
# --no-dev before building; this script doesn't re-run composer install.
rsync -a --delete \
    --exclude='var/cache' \
    --exclude='var/log' \
    --exclude='var/data.sqlite*' \
    --exclude='vendor/symfony/maker-bundle' \
    "$SYMFONY_DIR/" "$APPDIR/usr/share/$APP_NAME/symfony/"

# ── Run linuxdeploy + Qt plugin ───────────────────────────────────────
# linuxdeploy refuses to run as root; not an issue under normal users.
step "linuxdeploy --plugin qt --output appimage"
cd "$(dirname "$APPDIR")"

# linuxdeploy reads QML_SOURCES_PATHS to find QML modules to bundle.
# Point it at the example's QML so its plugin gets picked up.
QML_SOURCES_PATHS=""
for d in "$SYMFONY_DIR/../qml" "$SYMFONY_DIR/../../qml"; do
    [ -d "$d" ] && QML_SOURCES_PATHS="$d"
done

# Stage the AppDir + Qt deps first; then call appimagetool ourselves
# so the slow squashfs step is observable (linuxdeploy's bundled
# appimagetool download path was opaque on first run).
QML_SOURCES_PATHS="$QML_SOURCES_PATHS" \
EXTRA_PLATFORM_PLUGINS=libqoffscreen.so \
LD_LIBRARY_PATH="" \
"$LD" \
    --appdir "$APPDIR" \
    --executable "$APPDIR/usr/bin/$APP_NAME" \
    --desktop-file "$DESKTOP" \
    --icon-file    "$ICON" \
    --plugin qt

step "appimagetool — squash AppDir into single-file AppImage"
"$APPIMAGETOOL" --runtime-file "$RUNTIME_FILE" "$APPDIR" "$OUTPUT"

echo
echo "✓ AppImage at $OUTPUT"
ls -la "$OUTPUT"