#!/bin/bash

# Backup NexusOS via git → Gitea (enderofwings/NexusOS). Replaces the old
# rsync-to-router backup. Commits the tracked tree (source, config, playbooks,
# branding, docs) plus a SQL dump of the memory DB, then pushes to the remote —
# so a fresh clone + restore.sh fully rebuilds the machine.
#
#   backup.sh                 Commit changed files + push.
#   backup.sh full | -f       Also snapshot live desktop wiring + Claude notes first.
#   backup.sh -c | --claude   Dry-run: show what a backup WOULD commit/push. No changes.
#
# The regenerable heavies (Promethean venv, ollama binary, models/, node_modules,
# dist, runtime logs) are intentionally NOT backed up — restore.sh rebuilds them
# from requirements-*.txt / package-lock.json / `ollama pull`.

NEXUS_ROOT="$HOME/nexus-core"
cd "$NEXUS_ROOT" || { echo "No $NEXUS_ROOT"; exit 1; }
mode="${1:-}"

DB="synapse/memory/memory.db"
DB_SQL="synapse/memory/memory.db.sql"

# Dump the (gitignored, binary, WAL) memory DB to a diff-friendly SQL file so git
# backs up the assistant's memory + conversation history. sqlite3 reads through
# the WAL, so the dump includes the latest committed data without a checkpoint.
dump_db() {
    [ -f "$DB" ] || return 0
    if sqlite3 "$DB" ".dump" > "$DB_SQL" 2>/dev/null; then
        echo "Dumped memory DB → $DB_SQL"
    else
        echo "Warning: could not dump $DB (sqlite3 missing?) — DB not captured"
    fi
}

# full mode: snapshot the LIVE desktop wiring into the repo (reference copy for
# recovery/diffing; install-theme.sh remains the applier on restore), and copy
# the Claude memory notes in so git commits their content.
snapshot_desktop() {
    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

    # Copy the Claude memory notes (machine knowledge under ~/.claude) into the
    # repo so they're versioned too. Some aren't Nexus-specific (Fusion 360, etc.).
    notes_src="$HOME/.claude/projects/-home-jon-nexus-core/memory"
    notes_dst="$NEXUS_ROOT/assets/notes"
    mkdir -p "$notes_dst"
    cp -f "$notes_src"/*.md "$notes_dst/" 2>/dev/null || true
}

# Check mode: dry-run. Show what a real backup would commit and push.
if [ "$mode" = "-c" ] || [ "$mode" = "--claude" ] || [ "$mode" = "check" ]; then
    dump_db
    echo ""
    echo "Files a backup would commit:"
    git status --short
    echo ""
    echo "Local commits not yet pushed:"
    git log --oneline @{u}.. 2>/dev/null || echo "(none / no upstream)"
    echo ""
    echo "(dry-run only — nothing committed or pushed. Apply with: backup)"
    exit 0
fi

if [ "$mode" = "full" ] || [ "$mode" = "-f" ]; then
    snapshot_desktop
fi

dump_db
git add -A
if git diff --cached --quiet; then
    echo "No changes to commit."
else
    git commit -q -m "backup: $(date -Is)"
    echo "Committed backup snapshot."
fi

echo "Pushing to Gitea..."
if git push origin main; then
    echo "Backup complete."
else
    echo "Push failed. Set up credentials once with:"
    echo "  git config credential.helper store   # then push once and enter your Gitea token"
    exit 1
fi