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

# Backs up everything SignalScope needs to restore its configuration,
# feedback rules, baselines, and incident history: the whole state/
# directory. SQLite databases are backed up live via `sqlite3 .backup`
# (a consistent snapshot even while the monitor is writing to them)
# instead of a plain file copy, which can capture a torn/inconsistent
# write. JSON files (config, feedback, incidents, caches) are already
# written atomically by SignalScope (temp file + rename), so a plain
# copy of those is safe.

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
STATE_DIR="${FGAI_STATE_DIR:-$ROOT_DIR/state}"
BACKUP_ROOT="${1:-$ROOT_DIR/backups}"
STAMP="$(date -u +%Y%m%dT%H%M%SZ)"
DEST_DIR="$BACKUP_ROOT/signalscope-state-$STAMP"

if [ ! -d "$STATE_DIR" ]; then
    printf 'State directory not found: %s\n' "$STATE_DIR" >&2
    exit 1
fi

mkdir -p "$DEST_DIR"

shopt -s nullglob
for db in "$STATE_DIR"/*.sqlite3; do
    name="$(basename "$db")"
    if command -v sqlite3 >/dev/null 2>&1; then
        sqlite3 "$db" ".backup '$DEST_DIR/$name'"
    else
        printf 'Warning: sqlite3 CLI not found, falling back to plain copy for %s (may be inconsistent if the monitor is running)\n' "$name" >&2
        cp "$db" "$DEST_DIR/$name"
    fi
done

for json_file in "$STATE_DIR"/*.json; do
    cp "$json_file" "$DEST_DIR/$(basename "$json_file")"
done
shopt -u nullglob

ARCHIVE="$BACKUP_ROOT/signalscope-state-$STAMP.tar.gz"
tar -czf "$ARCHIVE" -C "$BACKUP_ROOT" "signalscope-state-$STAMP"
rm -rf "$DEST_DIR"

printf 'Backed up %s to %s\n' "$STATE_DIR" "$ARCHIVE"