#!/bin/bash

# 检查 Hugging Face Token 和 Dataset ID 环境变量
if [[ -z "$HF_TOKEN" ]] || [[ -z "$DATASET_ID" ]]; then
    echo "Starting Cloudreve without backup functionality - missing HF_TOKEN or DATASET_ID"
    exec /opt/cloudreve/cloudreve -c /opt/cloudreve/config.ini
    exit 0
fi

# 定义 Cloudreve 数据目录和配置文件路径
DATA_DIR="/opt/cloudreve/data"
CONFIG_FILE="/opt/cloudreve/config.ini"
BACKUP_PREFIX="cloudreve_backup"

# 激活 Python 虚拟环境
if [ -f "/opt/venv/bin/activate" ]; then
    source /opt/venv/bin/activate
fi

# Python 函数：上传备份
upload_backup() {
    local file_path="$1"
    local file_name="$2"
    local token="$HF_TOKEN"
    local repo_id="$DATASET_ID"

    python3 -c "
from huggingface_hub import HfApi
import sys
import os
import glob

def manage_backups(api, repo_id, max_files=5):
    files = api.list_repo_files(repo_id=repo_id, repo_type='dataset')
    backup_files = [f for f in files if f.startswith('$BACKUP_PREFIX') and f.endswith('.tar.gz')]
    backup_files.sort()

    if len(backup_files) >= max_files:
        files_to_delete = backup_files[:(len(backup_files) - max_files + 1)]
        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='$token')
try:
    api.upload_file(
        path_or_fileobj='$file_path',
        path_in_repo='$file_name',
        repo_id='$repo_id',
        repo_type='dataset'
    )
    print(f'Successfully uploaded $file_name')

    manage_backups(api, '$repo_id')
except Exception as e:
    print(f'Error uploading file: {str(e)}')
"
}

# Python 函数：下载最新备份
download_latest_backup() {
    local token="$HF_TOKEN"
    local repo_id="$DATASET_ID"

    python3 -c "
from huggingface_hub import HfApi
import sys
import os
import tarfile
import tempfile
import glob

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('$BACKUP_PREFIX') 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):
            # 删除现有的数据目录和配置文件
            if [ -d \"$DATA_DIR\" ]; then
                echo \"Deleting existing data directory: $DATA_DIR\"
                rm -rf \"$DATA_DIR\"
            fi
            if [ -f \"$CONFIG_FILE\" ]; then
                echo \"Deleting existing config file: $CONFIG_FILE\"
                rm -rf \"$CONFIG_FILE\"
            fi
            mkdir -p \"$DATA_DIR\"
            with tarfile.open(filepath, 'r:gz') as tar:
                tar.extractall(\"/opt/cloudreve\") # 将备份恢复到 /opt/cloudreve 目录
            echo f'Successfully restored backup from {latest_backup}'
except Exception as e:
    print(f'Error downloading backup: {str(e)}')
"
}

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

# 后台启动同步进程
sync_data() {
    while true; do
        echo "Starting sync process at $(date)"

        if [ -d "$DATA_DIR" ]; then
            timestamp=$(date +%Y%m%d_%H%M%S)
            backup_file="${BACKUP_PREFIX}_${timestamp}.tar.gz"
            backup_path="/tmp/${backup_file}"

            echo "Compressing data directory and config file..."
            tar -czf "$backup_path" -C /opt/cloudreve cloudreve config.ini

            echo "Uploading backup to HuggingFace..."
            upload_backup "$backup_path" "${backup_file}"

            rm -f "$backup_path"
        else
            echo "Data directory does not exist yet, waiting for next sync..."
        fi

        SYNC_INTERVAL=${SYNC_INTERVAL:-3600} # 默认同步间隔为 1 小时
        echo "Next sync in ${SYNC_INTERVAL} seconds..."
        sleep $SYNC_INTERVAL
    done
}

sync_data &

# 启动 Cloudreve
echo "Starting Cloudreve..."
exec /opt/cloudreve/cloudreve -c /opt/cloudreve/config.ini