#!/bin/sh

# 检查环境变量
if [ -z "$HF_TOKEN" ] || [ -z "$DATASET_ID" ]; then
    echo "未检测到 HF_TOKEN 或 DATASET_ID，备份功能不可用"
    exit 1
fi

# 激活虚拟环境
. ${APP_HOME}/venv/bin/activate

# 生成同步脚本
cat > /tmp/hf_sync.py << 'EOL'
# HuggingFace 同步脚本
from huggingface_hub import HfApi
import sys
import os
import tarfile
import tempfile

def manage_backups(api, repo_id, prefix, 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(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'已删除旧备份: {file_to_delete}')
            except Exception as e:
                print(f'删除 {file_to_delete} 时出错: {str(e)}')

def upload_backup(file_path, file_name, token, repo_id, prefix):
    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"成功上传 {file_name}")
        manage_backups(api, repo_id, prefix)
    except Exception as e:
        print(f"上传文件出错: {str(e)}")

def download_latest_backup(token, repo_id, prefix, extract_path):
    try:
        api = HfApi(token=token)
        files = api.list_repo_files(repo_id=repo_id, repo_type="dataset")
        backup_files = [f for f in files if f.startswith(prefix) and f.endswith('.tar.gz')]
        if not backup_files:
            print(f"未找到任何备份文件（前缀: {prefix}）")
            return
        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):
                try:
                    with tarfile.open(filepath, 'r:gz') as tar:
                        tar.extractall(extract_path)
                    print(f"已成功恢复备份: {latest_backup} 到 {extract_path}")
                except Exception as e:
                    print(f"解压备份时出错: {str(e)}")
    except Exception as e:
        print(f"下载备份出错: {str(e)}")

def super_squash_history(token, repo_id):
    try:
        api = HfApi(token=token)
        api.super_squash_history(repo_id=repo_id, repo_type="dataset")
        print("历史合并完成。")
    except Exception as e:
        print(f"合并历史出错: {str(e)}")

if __name__ == "__main__":
    action = sys.argv[1]
    token = sys.argv[2]
    repo_id = sys.argv[3]
    if action == "upload":
        file_path = sys.argv[4]
        file_name = sys.argv[5]
        prefix = sys.argv[6]
        upload_backup(file_path, file_name, token, repo_id, prefix)
    elif action == "download":
        prefix = sys.argv[4]
        extract_path = sys.argv[5]
        download_latest_backup(token, repo_id, prefix, extract_path)
    elif action == "super_squash":
        super_squash_history(token, repo_id)
EOL

# 首次启动时分别还原 config 和 tools
echo "正在从 HuggingFace 下载 config 备份..."
python /tmp/hf_sync.py download "${HF_TOKEN}" "${DATASET_ID}" "config_backup_" "/mcp-proxy-server/config"
echo "正在从 HuggingFace 下载 tools 备份..."
python /tmp/hf_sync.py download "${HF_TOKEN}" "${DATASET_ID}" "tools_backup_" "/tools"

# 同步函数
sync_data() {
    while true; do
        echo "同步进程启动于 $(date)"

        STORAGE_PATH1="/mcp-proxy-server/config"
        STORAGE_PATH2="/tools"
        timestamp=$(date +%Y%m%d_%H%M%S)
        backup_file1="config_backup_${timestamp}.tar.gz"
        backup_file2="tools_backup_${timestamp}.tar.gz"

        if [ -d "${STORAGE_PATH1}" ]; then
            tar -czf "/tmp/${backup_file1}" -C "/mcp-proxy-server" "config"
            echo "正在上传 config 备份到 HuggingFace..."
            python /tmp/hf_sync.py upload "${HF_TOKEN}" "${DATASET_ID}" "/tmp/${backup_file1}" "${backup_file1}" "config_backup_"
            rm -f "/tmp/${backup_file1}"
        fi

        if [ -d "${STORAGE_PATH2}" ]; then
            tar -czf "/tmp/${backup_file2}" -C "/" "tools"
            echo "正在上传 tools 备份到 HuggingFace..."
            python /tmp/hf_sync.py upload "${HF_TOKEN}" "${DATASET_ID}" "/tmp/${backup_file2}" "${backup_file2}" "tools_backup_"
            rm -f "/tmp/${backup_file2}"
        fi

        # 合并历史提交
        SQUASH_FLAG_FILE="/tmp/last_squash_time"
        NOW=$(date +%s)
        SEVEN_DAYS=$((7*24*60*60))
        if [ ! -f "$SQUASH_FLAG_FILE" ]; then
            echo $NOW > "$SQUASH_FLAG_FILE"
            echo "首次合并历史提交..."
            python /tmp/hf_sync.py super_squash "${HF_TOKEN}" "${DATASET_ID}"
        else
            LAST=$(cat "$SQUASH_FLAG_FILE")
            DIFF=$((NOW - LAST))
            if [ $DIFF -ge $SEVEN_DAYS ]; then
                echo $NOW > "$SQUASH_FLAG_FILE"
                echo "距离上次合并已超过7天，正在合并历史提交..."
                python /tmp/hf_sync.py super_squash "${HF_TOKEN}" "${DATASET_ID}"
            else
                echo "距离上次合并未满7天，本次跳过合并历史提交。"
            fi
        fi

        SYNC_INTERVAL=${SYNC_INTERVAL:-7200}
        echo "下次同步将在 ${SYNC_INTERVAL} 秒后进行..."
        sleep $SYNC_INTERVAL
    done
}

# 启动同步进程
sync_data &

echo "同步进程已在后台启动 (PID: $!)"
echo "现在启动 MCP Proxy 主程序..."

# 启动原始的 MCP Proxy 程序
echo "准备启动 MCP Proxy，端口: ${PORT:-7860}，主机: ${HOST:-0.0.0.0}"

if [ -f build/sse.js ]; then
    echo "启动: node build/sse.js"
    exec node build/sse.js
elif [ -f /app/build/sse.js ]; then
    echo "启动: node /app/build/sse.js"
    exec node /app/build/sse.js
elif [ -f /mcp-proxy-server/build/sse.js ]; then
    echo "启动: node /mcp-proxy-server/build/sse.js"  
    exec node /mcp-proxy-server/build/sse.js
else
    echo "错误: 找不到 build/sse.js 文件"
    echo "当前目录: $(pwd)"
    echo "查找可能的 Node.js 文件:"
    find / -name "sse.js" -type f 2>/dev/null | head -5
    
    # 如果找不到，保持容器运行以便调试
    echo "保持容器运行以便调试..."
    tail -f /dev/null
fi