#!/bin/bash
# 检查环境变量
if [[ -z "$HF_TOKEN" ]] || [[ -z "$DATASET_ID" ]]; then
    echo "Starting without backup functionality - missing HF_TOKEN or DATASET_ID"
    exec /start.sh
    exit 0
fi

# 等待Cloudflare Tunnel就绪
check_tunnel() {
    while ! curl -s http://localhost:7860 >/dev/null; do
        echo "Waiting for Cloudflare Tunnel to be ready..."
        sleep 5
    done
}

# 激活虚拟环境
source /opt/venv/bin/activate

# 上传备份（含自动清理旧备份）
upload_backup() {
    file_path="$1"
    file_name="$2"
    token="$HF_TOKEN"
    repo_id="$DATASET_ID"
    python3 -c "
from huggingface_hub import HfApi
import sys
import os

def manage_backups(api, repo_id, max_files=50):
    files = api.list_repo_files(repo_id=repo_id, repo_type='dataset')
    backup_files = [f for f in files if f.startswith('vaultwarden_backup_') and f.endswith('.tar.gz')]
    backup_files.sort()
    if len(backup_files) >= max_files:
        delete_count = len(backup_files) - max_files + 1
        files_to_delete = backup_files[:delete_count]
        for file_to_delete in files_to_delete:
            try:
                api.delete_file(
                    path_in_repo=file_to_delete,
                    repo_id=repo_id,
                    repo_type='dataset'
                )
                print(f'Deleted old backup: {file_to_delete}')
            except Exception as e:
                print(f'Error deleting {file_to_delete}: {str(e)}')

api = HfApi(token='$token')
try:
    # 上传新备份
    api.upload_file(
        path_or_fileobj='$file_path',
        path_in_repo='$file_name',
        repo_id='$repo_id',
        repo_type='dataset'
    )
    print(f'Successfully uploaded $file_name')
    
    # 清理旧备份
    manage_backups(api, '$repo_id')
except Exception as e:
    print(f'Error uploading file: {str(e)}')
"
}

# 下载最新备份（完整实现）
download_latest_backup() {
    token="$HF_TOKEN"
    repo_id="$DATASET_ID"
    python3 -c "
from huggingface_hub import HfApi
import sys
import os
import tarfile
import tempfile
import shutil

api = HfApi(token='$token')
try:
    files = api.list_repo_files(repo_id='$repo_id', repo_type='dataset')
    backup_files = [f for f in files if f.startswith('vaultwarden_backup_') and f.endswith('.tar.gz')]
    if not backup_files:
        print('No backup files found')
        sys.exit()
    latest_backup = sorted(backup_files)[-1]
    with tempfile.TemporaryDirectory() as temp_dir:
        filepath = api.hf_hub_download(
            repo_id='$repo_id',
            filename=latest_backup,
            repo_type='dataset',
            local_dir=temp_dir
        )
        if filepath and os.path.exists(filepath):
            # 确保数据目录存在
            os.makedirs('/data', exist_ok=True)
            # 清空旧数据（防止残留文件干扰）
            if os.listdir('/data'):
                for f in os.listdir('/data'):
                    item_path = os.path.join('/data', f)
                    if os.path.isfile(item_path):
                        os.remove(item_path)
                    elif os.path.isdir(item_path):
                        shutil.rmtree(item_path)
            # 解压备份文件
            with tarfile.open(filepath, 'r:gz') as tar:
                tar.extractall('/data')
            print(f'Successfully restored backup from {latest_backup}')
except Exception as e:
    print(f'Error downloading backup: {str(e)}')
    sys.exit(1)
"
}

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

# 同步函数
sync_data() {
    while true; do
        echo "Starting sync process at $(date)"
        if [ -d /data ]; then
            timestamp=$(date +%Y%m%d_%H%M%S)
            backup_file="vaultwarden_backup_${timestamp}.tar.gz"
            # 压缩数据目录（排除临时文件）
            tar -czf "/tmp/${backup_file}" -C /data .
            echo "Uploading backup to HuggingFace..."
            upload_backup "/tmp/${backup_file}" "${backup_file}"
            rm -f "/tmp/${backup_file}"
        else
            echo "Data directory does not exist yet, waiting for next sync..."
        fi
        SYNC_INTERVAL=${SYNC_INTERVAL:-7200}
        echo "Next sync in ${SYNC_INTERVAL} seconds..."
        sleep $SYNC_INTERVAL
    done
}

# 启动Cloudflare Tunnel检查
check_tunnel &

# 启动备份同步进程
sync_data &

# 启动Vaultwarden主程序
exec /start.sh