#!/bin/bash
#
# OpenClaw 配置备份监控脚本
# 功能：监控 openclaw.json 变化，自动备份，最多保留10个版本
#

OPENCLAW_CONFIG="/root/.openclaw/openclaw.json"
BACKUP_DIR="/root/.openclaw/backups"
MAX_BACKUPS=10
CHECK_INTERVAL=60  # 每60秒检查一次

# 确保备份目录存在
mkdir -p "$BACKUP_DIR"

# 获取当前文件的md5
get_md5() {
    md5sum "$OPENCLAW_CONFIG" 2>/dev/null | cut -d' ' -f1
}

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

# 备份函数
backup_config() {
    local current_md5=$(get_md5)
    local timestamp=$(date '+%Y-%m-%d_%H-%M-%S')
    local backup_file="$BACKUP_DIR/openclaw.json.$timestamp.bak"

    # 复制配置文件
    cp "$OPENCLAW_CONFIG" "$backup_file"
    log "已备份: $backup_file (md5: $current_md5)"

    # 清理旧备份，保留最多10个
    backup_count=$(ls -1 "$BACKUP_DIR"/openclaw.json.*.bak 2>/dev/null | wc -l)
    if [ "$backup_count" -gt "$MAX_BACKUPS" ]; then
        # 按修改时间删除最旧的备份
        old_backups=$(ls -1t "$BACKUP_DIR"/openclaw.json.*.bak | tail -n +$((MAX_BACKUPS + 1)))
        for old_backup in $old_backups; do
            rm -f "$old_backup"
            log "已删除旧备份: $old_backup"
        done
    fi

    # 保存当前md5供下次对比
    echo "$current_md5" > "$BACKUP_DIR/.last_md5"
}

# 主循环
main() {
    log "配置备份监控启动..."

    # 首次运行：备份当前配置
    if [ -f "$OPENCLAW_CONFIG" ]; then
        # 检查是否有上次记录的md5
        if [ -f "$BACKUP_DIR/.last_md5" ]; then
            last_md5=$(cat "$BACKUP_DIR/.last_md5")
            current_md5=$(get_md5)

            if [ "$last_md5" != "$current_md5" ]; then
                log "检测到配置变化，首次备份..."
                backup_config
            else
                log "配置无变化，跳过备份"
                # 更新md5记录（确保文件存在）
                get_md5 > "$BACKUP_DIR/.last_md5"
            fi
        else
            log "首次运行，备份当前配置..."
            backup_config
        fi
    else
        log "错误: 配置文件不存在: $OPENCLAW_CONFIG"
        exit 1
    fi

    # 持续监控循环
    while true; do
        sleep "$CHECK_INTERVAL"

        if [ ! -f "$OPENCLAW_CONFIG" ]; then
            log "错误: 配置文件丢失: $OPENCLAW_CONFIG"
            sleep 60
            continue
        fi

        current_md5=$(get_md5)
        last_md5=$(cat "$BACKUP_DIR/.last_md5" 2>/dev/null)

        if [ "$last_md5" != "$current_md5" ]; then
            log "检测到配置变化，开始备份..."
            backup_config
        fi
    done
}

main