"""远程训练入口脚本 — 在算力节点上执行。"""
import asyncio
import json
import os
import sys
import signal
from pathlib import Path

# 禁用 FlashAttention
os.environ["PYTORCH_NO_FLASH"] = "1"
os.environ["FLASH_ATTENTION_ENABLED"] = "0"


async def run_training(job_id: str, model_id: str, model_type: str, dataset_id: str, config: dict):
    """执行单个训练任务（远程调用入口）。"""
    from app.config import get_settings
    from app.core.logging import logger

    settings = get_settings()

    # 查找数据集
    from app.core.db import async_session, DatasetRecord
    from sqlalchemy import select

    dataset_path = None
    async with async_session() as session:
        result = await session.execute(select(DatasetRecord).where(
            (DatasetRecord.id == dataset_id) | (DatasetRecord.name == dataset_id)
        ))
        record = result.scalar_one_or_none()
        if record:
            dataset_path = record.file_path

    if not dataset_path:
        # 尝试 uploads 目录
        upload_path = settings.uploads_dir / dataset_id
        if upload_path.exists():
            dataset_path = str(upload_path)

    if not dataset_path:
        raise FileNotFoundError(f"Dataset not found: {dataset_id}")

    # 预处理
    processed_path = str(settings.processed_dir / f"{job_id}_processed.jsonl")
    task_type = config.get("task_type", "sft")
    template = config.get("dataset_template", "alpaca")

    # 选择引擎
    if model_type == "vision":
        from app.engines.vision_engine import vision_engine
        engine = vision_engine
    elif model_type == "multimodal":
        from app.engines.multimodal_engine import multimodal_engine
        engine = multimodal_engine
    else:
        from app.engines.text_engine import text_engine
        engine = text_engine

    peft_method = config.get("peft_method", "lora")

    # 预处理数据集
    await engine.preprocess_dataset(dataset_path, processed_path, task_type=task_type, template=template)

    # 加载模型
    await engine.load_model(model_id, quantization="4bit" if peft_method == "qlora" else None)

    # 构建 PEFT 配置
    peft_config = engine.get_peft_config(peft_method, config)

    # 训练
    adapter_path = await engine.train(
        job_id=job_id,
        dataset_path=processed_path,
        peft_config=peft_config,
        training_args=config,
    )

    logger.info(f"Remote training completed: {job_id} -> {adapter_path}")
    return adapter_path


def main():
    """命令行入口：python -m app.engines.remote_train <job_id> <model_id> <model_type> <dataset_id> <config_json>"""
    if len(sys.argv) < 6:
        print("Usage: python -m app.engines.remote_train <job_id> <model_id> <model_type> <dataset_id> <config_json>")
        sys.exit(1)

    job_id = sys.argv[1]
    model_id = sys.argv[2]
    model_type = sys.argv[3]
    dataset_id = sys.argv[4]
    config = json.loads(sys.argv[5])

    asyncio.run(run_training(job_id, model_id, model_type, dataset_id, config))


if __name__ == "__main__":
    main()