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

# Build a Debian package (.deb) for Agent Joule from a bundle-linux tarball.
#
#   script/build-deb <zed-linux-ARCH.tar.gz> <version> [deb-arch]
#
# Lays the tarball's zed.app under /usr/lib/agent-joule, symlinks the launcher to
# /usr/bin/agent-joule, and installs the desktop entry + icons for system menus.
# Works on Linux (dpkg-deb) and macOS (falls back to ar + tar).

tarball="${1:?usage: build-deb <tarball> <version> [arch]}"
version="${2:?usage: build-deb <tarball> <version> [arch]}"
deb_arch="${3:-amd64}"

workdir="$(mktemp -d)"
trap 'rm -rf "$workdir"' EXIT
pkgroot="$workdir/pkg"

# Extract the bundle and locate the zed*.app directory inside it.
mkdir -p "$workdir/extract"
tar -xzf "$tarball" -C "$workdir/extract"
app_src="$(find "$workdir/extract" -maxdepth 1 -type d -name '*.app' | head -1)"
[ -n "$app_src" ] || { echo "no .app dir found in $tarball" >&2; exit 1; }

# /usr/lib/agent-joule holds the self-contained app (bin/, libexec/, lib/, share/).
install_dir="$pkgroot/usr/lib/agent-joule"
mkdir -p "$install_dir" "$pkgroot/usr/bin" \
         "$pkgroot/usr/share/applications" \
         "$pkgroot/usr/share/icons/hicolor/512x512/apps" \
         "$pkgroot/usr/share/icons/hicolor/1024x1024/apps"
cp -a "$app_src/." "$install_dir/"

# Launcher on PATH. bin/zed (the cli) resolves libexec/zed-editor by its real
# path, so a symlink into /usr/bin keeps the app self-locating.
ln -sf /usr/lib/agent-joule/bin/zed "$pkgroot/usr/bin/agent-joule"

# Desktop entry + icons for the application menu (rename zed -> agent-joule, and
# point Exec/Icon at the installed paths).
desktop_src="$(find "$install_dir/share/applications" -name '*.desktop' | head -1 || true)"
if [ -n "${desktop_src:-}" ]; then
  sed -e 's%^Exec=.*%Exec=/usr/bin/agent-joule %' \
      -e 's%^Icon=.*%Icon=agent-joule%' \
      -e 's%^Name=.*%Name=Agent Joule%' \
      "$desktop_src" > "$pkgroot/usr/share/applications/agent-joule.desktop"
fi
for size in 512x512 1024x1024; do
  icon="$install_dir/share/icons/hicolor/$size/apps/zed.png"
  [ -f "$icon" ] && cp "$icon" "$pkgroot/usr/share/icons/hicolor/$size/apps/agent-joule.png"
done

installed_kb="$(du -sk "$pkgroot" | cut -f1)"

# Debian control metadata.
mkdir -p "$pkgroot/DEBIAN"
cat > "$pkgroot/DEBIAN/control" <<CONTROL
Package: agent-joule
Version: ${version}
Section: devel
Priority: optional
Architecture: ${deb_arch}
Maintainer: Transaction Science <hello@transaction.science>
Installed-Size: ${installed_kb}
Depends: libc6, libstdc++6, zlib1g, libfontconfig1, libxkbcommon0, libxkbcommon-x11-0, libwayland-client0, libvulkan1, libgl1, libasound2
Homepage: https://az.transaction.science
Description: Deterministic-first, energy-metered AI coding editor (a fork of Zed)
 Agent Joule resolves code deterministic-first (lookup, search, templates) and
 reaches for a model only as a last resort, with energy tracking and code
 traceability built in.
CONTROL

cat > "$pkgroot/DEBIAN/postinst" <<'POSTINST'
#!/bin/sh
set -e
if command -v gtk-update-icon-cache >/dev/null 2>&1; then
  gtk-update-icon-cache -q /usr/share/icons/hicolor || true
fi
if command -v update-desktop-database >/dev/null 2>&1; then
  update-desktop-database -q /usr/share/applications || true
fi
exit 0
POSTINST
chmod 0755 "$pkgroot/DEBIAN/postinst"

out="agent-joule_${version}_${deb_arch}.deb"
if command -v dpkg-deb >/dev/null 2>&1; then
  dpkg-deb --root-owner-group --build "$pkgroot" "$out"
else
  # Portable fallback (macOS): assemble the ar archive by hand.
  echo "dpkg-deb not found; building .deb with ar + tar"
  ( cd "$pkgroot" && tar --numeric-owner --owner=0 --group=0 -czf "$workdir/data.tar.gz" \
       --exclude=./DEBIAN -C "$pkgroot" . )
  ( cd "$pkgroot/DEBIAN" && tar --numeric-owner --owner=0 --group=0 -czf "$workdir/control.tar.gz" . )
  echo "2.0" > "$workdir/debian-binary"
  ( cd "$workdir" && ar rc "$OLDPWD/$out" debian-binary control.tar.gz data.tar.gz )
fi

echo "Built ${out}"