#!/bin/bash

# NAS Backup Script — runs daily via cron
# Crontab: 0 3 * * * /volume1/docker/nas-tools/backup.sh >> /volume1/backups/nas-tools/backup.log 2>&1

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
BACKUP_DIR="/volume1/backups/nas-tools"
DATE=$(date +%Y%m%d_%H%M%S)
RETENTION_DAYS=7
ERRORS=0

[ -f "$SCRIPT_DIR/.env" ] && source "$SCRIPT_DIR/.env"

mkdir -p "$BACKUP_DIR"

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1"; }

notify() {
    if [ -n "$TELEGRAM_BOT_TOKEN" ] && [ -n "$TELEGRAM_CHAT_ID" ]; then
        curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
            -d chat_id="$TELEGRAM_CHAT_ID" -d text="$1" -d parse_mode="Markdown" > /dev/null
    fi
}

run_backup() {
    local desc="$1"; shift
    log "Backing up $desc..."
    if "$@"; then
        log "$desc OK"
    else
        log "FAILED: $desc"
        ERRORS=$((ERRORS + 1))
    fi
}

log "=== Backup started ==="

# Database dumps
run_backup "Gitea DB" docker exec gitea-db pg_dump -U gitea -f /tmp/gitea_dump.sql gitea
docker cp gitea-db:/tmp/gitea_dump.sql "$BACKUP_DIR/gitea_db_$DATE.sql" 2>/dev/null

run_backup "Immich DB" docker exec immich-db pg_dump -U postgres -f /tmp/immich_dump.sql immich
docker cp immich-db:/tmp/immich_dump.sql "$BACKUP_DIR/immich_db_$DATE.sql" 2>/dev/null

# Config backups
CONFIGS=()
for p in \
    /volume1/docker/nas-dashboard/.env \
    /volume1/docker/nas-dashboard/auth.json \
    /volume1/docker/gitea/conf \
    /volume1/docker/immich/.env \
    /volume1/docker/navidrome/data/navidrome.db \
    /volume1/docker/openclaw/data; do
    [ -e "$p" ] && CONFIGS+=("$p")
done

if [ ${#CONFIGS[@]} -gt 0 ]; then
    run_backup "Configs" tar -czf "$BACKUP_DIR/configs_$DATE.tar.gz" "${CONFIGS[@]}"
fi

# Cleanup old backups
log "Cleaning backups older than $RETENTION_DAYS days..."
find "$BACKUP_DIR" -type f \( -name "*.sql" -o -name "*.tar.gz" \) -mtime +$RETENTION_DAYS -delete

# Summary
log "=== Backup finished ($ERRORS errors) ==="

if [ $ERRORS -gt 0 ]; then
    notify "🔴 *NAS Backup FAILED* ($DATE)
$ERRORS error(s) — check logs"
else
    notify "🟢 *NAS Backup OK* ($DATE)"
fi