#!/bin/bash

# Backup NexusOS to the router. All modes rsync into the canonical nexus-core
# folder over the normal SSH daemon (host: router, port 9001) — the SAME folder
# restore.sh pulls from, so backup and restore stay in sync.
#
#   backup.sh                 Fast incremental backup.
#   backup.sh full            Same, but first snapshots the live desktop wiring
#                             and retains runtime/ (minus logs) for a fuller copy.
#   backup.sh -c | --claude   Dry-run: show what a backup WOULD push (content-
#                             level), change nothing. For deciding whether an
#                             actual backup is needed.

NEXUS_ROOT="$HOME/nexus-core"
DEST="router:/tmp/mnt/Wingdrive2/nexus-core/"
mode="$1"

# Standard (incremental) excludes — shared by the default backup AND the
# -c/--claude check, so the dry-run accurately previews a real backup.
EXCLUDES=(
    --exclude='.git/'
    --exclude='Promethean/'
    --exclude='models/blobs/'
    --exclude='ollama/'
    --exclude='interface/web/node_modules/'
    --exclude='interface/web/dist/'
    --exclude='runtime/'
    --exclude='__pycache__/'
    --exclude='*.pyc'
)

# Check mode (-c|--claude|check): content-level dry-run, no transfer. Lists what
# a standard backup would push to the router (and delete there). --checksum
# compares by content (not size/mtime), so only genuine differences show.
if [ "$mode" = "-c" ] || [ "$mode" = "--claude" ] || [ "$mode" = "check" ]; then
    echo "Checking backup diff vs router (dry-run, content-level, no changes)..."
    rsync -rlni --checksum --delete "${EXCLUDES[@]}" -e ssh "$NEXUS_ROOT/" "$DEST"
    echo ""
    echo "(dry-run only — nothing pushed. Apply with: backup  or  backup full)"
    exit 0
fi

if [ "$mode" = "full" ] || [ "$mode" = "-f" ]; then
    # Snapshot the live NexusOS desktop wiring into the repo before backing up,
    # so the backup captures the ACTUAL current state (not just the canonical
    # defaults baked into assets/themes/install-theme.sh). This is a reference
    # copy for recovery/diffing; install-theme.sh remains the applier on restore.
    snap="$NEXUS_ROOT/assets/themes/restore-snapshot"
    mkdir -p "$snap"
    {
        echo "# NexusOS live desktop wiring — snapshot $(date -Is)"
        echo "# Reference only. Restore is done by assets/themes/install-theme.sh"
        for p in /Net/ThemeName /Net/IconThemeName /Gtk/CursorThemeName \
                 /Gtk/CursorThemeSize /Gtk/FontName; do
            echo "xsettings $p = $(xfconf-query -c xsettings -p "$p" 2>/dev/null)"
        done
        echo "xfwm4 /general/theme = $(xfconf-query -c xfwm4 -p /general/theme 2>/dev/null)"
    } > "$snap/xfconf.txt" 2>/dev/null || true
    cp -f "$HOME/.config/gtk-3.0/settings.ini" "$snap/gtk-3.0-settings.ini" 2>/dev/null || true
    cp -f "$HOME/.config/gtk-4.0/settings.ini" "$snap/gtk-4.0-settings.ini" 2>/dev/null || true
    cp -f "$HOME/.config/xfce4/panel/genmon-13.rc" \
          "$NEXUS_ROOT/management/panel/genmon-13.rc" 2>/dev/null || true

    # Symlink the Claude memory notes (machine knowledge that lives outside the
    # repo under ~/.claude) into assets/notes/ so the backup below captures them.
    # rsync runs with -L (copy-links), so the links resolve to real content on
    # the backup target. Relative links + a loop so new notes are picked up too.
    # Some of these notes aren't Nexus-specific (Fusion 360, distro/Wine).
    notes_src="$HOME/.claude/projects/-home-jon-nexus-core/memory"
    notes_dst="$NEXUS_ROOT/assets/notes"
    mkdir -p "$notes_dst"
    for f in "$notes_src"/*.md; do
        [ -e "$f" ] || continue
        ln -sfr "$f" "$notes_dst/$(basename "$f")"
    done

    rsync -avzL --no-owner --no-group --delete \
        --exclude='.git/' \
        --exclude='Promethean/' \
        --exclude='models/blobs/' \
        --exclude='ollama/' \
        --exclude='interface/web/node_modules/' \
        --exclude='interface/web/dist/' \
        --exclude='runtime/logs/' \
        --exclude='runtime/backend.log' \
        --exclude='runtime/frontend.log' \
        --exclude='__pycache__/' \
        --exclude='*.pyc' \
        -e ssh \
        "$NEXUS_ROOT/" "$DEST"
else
    rsync -avz --no-owner --no-group --delete "${EXCLUDES[@]}" -e ssh "$NEXUS_ROOT/" "$DEST"
fi