#!/bin/bash

# 检查环境变量
if [[ -z "$WEBDAV_URL" ]] || [[ -z "$WEBDAV_USERNAME" ]] || [[ -z "$WEBDAV_PASSWORD" ]]; then
    echo "Starting without backup functionality - missing WEBDAV_URL, WEBDAV_USERNAME, or WEBDAV_PASSWORD"
    exit 0
fi

# 设置备份路径
WEBDAV_BACKUP_PATH=${WEBDAV_BACKUP_PATH:-""}
FULL_WEBDAV_URL="${WEBDAV_URL}"
if [ -n "$WEBDAV_BACKUP_PATH" ]; then
    FULL_WEBDAV_URL="${WEBDAV_URL}/${WEBDAV_BACKUP_PATH}"
fi

# 激活虚拟环境
source $HOME/venv/bin/activate

# 下载最新备份并恢复
restore_backup() {
    echo "开始从 WebDAV 下载最新备份..."
    python3 -c "
import sys
import os
import tarfile
import requests
import shutil
from webdav3.client import Client
options = {
    'webdav_hostname': '$FULL_WEBDAV_URL',
    'webdav_login': '$WEBDAV_USERNAME',
    'webdav_password': '$WEBDAV_PASSWORD'
}
client = Client(options)
backups = [file for file in client.list() if file.endswith('.tar.gz') and file.startswith('alist_backup_')]
if not backups:
    print('没有找到备份文件')
    sys.exit()
latest_backup = sorted(backups)[-1]
print(f'最新备份文件：{latest_backup}')
with requests.get(f'$FULL_WEBDAV_URL/{latest_backup}', auth=('$WEBDAV_USERNAME', '$WEBDAV_PASSWORD'), stream=True) as r:
    if r.status_code == 200:
        with open(f'/tmp/{latest_backup}', 'wb') as f:
            for chunk in r.iter_content(chunk_size=8192):
                f.write(chunk)
        print(f'成功下载备份文件到 /tmp/{latest_backup}')
        if os.path.exists(f'/tmp/{latest_backup}'):
            # 如果目录已存在，先删除它
            if os.path.exists('$HOME/data'):
                shutil.rmtree('$HOME/data')
            os.makedirs('$HOME/data', exist_ok=True)
            
            # 解压备份文件
            with tarfile.open(f'/tmp/{latest_backup}', 'r:gz') as tar:
                tar.extractall('$HOME/data')
            
            print(f'成功从 {latest_backup} 恢复备份')
        else:
            print('下载的备份文件不存在')
    else:
        print(f'下载备份失败：{r.status_code}')
"
}

# 首次启动时下载最新备份
echo "Downloading latest backup from WebDAV..."
restore_backup

# 等待30秒后启动程序
sleep 30

# 启动程序
./__a____li___st server &

# 同步函数
sync_data() {
    while true; do
        echo "Starting sync process at $(date)"

        if [ ! -d $HOME/data ]; then
            mkdir -p $HOME/data
            echo "Data directory created."
        fi

        timestamp=$(date +%Y%m%d_%H%M%S)
        backup_file="alist_backup_${timestamp}.tar.gz"

        # 压缩数据目录
        tar -czf "/tmp/${backup_file}" -C $HOME/data .

        # 上传新备份到WebDAV
        curl -u "$WEBDAV_USERNAME:$WEBDAV_PASSWORD" -T "/tmp/${backup_file}" "$FULL_WEBDAV_URL/${backup_file}"
        if [ $? -eq 0 ]; then
            echo "Successfully uploaded ${backup_file} to WebDAV"
        else
            echo "Failed to upload ${backup_file} to WebDAV"
        fi

        # 清理旧备份文件
        python3 -c "
import sys
from webdav3.client import Client
options = {
    'webdav_hostname': '$FULL_WEBDAV_URL',
    'webdav_login': '$WEBDAV_USERNAME',
    'webdav_password': '$WEBDAV_PASSWORD'
}
client = Client(options)
backups = [file for file in client.list() if file.endswith('.tar.gz') and file.startswith('alist_backup_')]
backups.sort()
if len(backups) > 5:
    to_delete = len(backups) - 5
    for file in backups[:to_delete]:
        client.clean(file)
        print(f'Successfully deleted {file}.')
else:
    print('Only {} backups found, no need to clean.'.format(len(backups)))
" 2>&1

        rm -f "/tmp/${backup_file}"
        
        SYNC_INTERVAL=${SYNC_INTERVAL:-600}
        echo "Next sync in ${SYNC_INTERVAL} seconds..."
        sleep $SYNC_INTERVAL
    done
}

# 启动同步进程
sync_data &