import shutil
import uuid
from datetime import datetime
from pathlib import Path
from threading import Thread

from fastapi import APIRouter, Body, HTTPException

from app import state
from app.config import CACHE_DIR, SQL_SCRIPT
from app.processor import DataProcessor, ProcessLogger


router = APIRouter(tags=["script"])


@router.get("/api/script/content")
async def get_script_content():
    try:
        if not SQL_SCRIPT.exists():
            return {
                "success": True,
                "content": "# SQL 脚本文件不存在，请在此编写脚本\n",
                "modified": None,
                "path": str(SQL_SCRIPT),
            }

        modified = datetime.fromtimestamp(SQL_SCRIPT.stat().st_mtime).strftime("%Y-%m-%d %H:%M:%S")
        return {
            "success": True,
            "content": SQL_SCRIPT.read_text(encoding="utf-8"),
            "modified": modified,
            "path": str(SQL_SCRIPT),
        }
    except Exception as exc:
        return {"success": False, "error": str(exc)}


@router.post("/api/script/execute")
async def execute_script():
    if state.global_task_lock["locked"]:
        raise HTTPException(status_code=409, detail="已有任务在运行，请等待完成")

    task_id = f"script_{uuid.uuid4().hex[:8]}"
    state.global_task_lock.update(
        {
            "locked": True,
            "task_id": task_id,
            "stage": "processing",
            "started_at": datetime.now().isoformat(),
        }
    )

    logs: list[str] = []

    def log_callback(message: str) -> None:
        logs.append(message)
        state.processing_tasks[task_id] = {"logs": logs.copy(), "status": "processing"}

    logger = ProcessLogger(log_file=None, callback=log_callback)
    state.processing_tasks[task_id] = {"logs": [], "status": "processing"}

    thread = Thread(target=_run_script, args=(task_id, logger, logs), daemon=True)
    thread.start()
    return {"success": True, "message": "脚本执行任务已启动", "task_id": task_id}


@router.post("/api/script/save")
async def save_script_content(content: str = Body(..., embed=True)):
    try:
        if SQL_SCRIPT.exists():
            shutil.copy(SQL_SCRIPT, SQL_SCRIPT.with_suffix(".sql.bak"))

        SQL_SCRIPT.write_text(content, encoding="utf-8")
        modified = datetime.fromtimestamp(SQL_SCRIPT.stat().st_mtime).strftime("%Y-%m-%d %H:%M:%S")
        return {"success": True, "message": "脚本保存成功", "modified": modified}
    except Exception as exc:
        return {"success": False, "error": str(exc)}


def _run_script(task_id: str, logger: ProcessLogger, logs: list[str]) -> None:
    temp_work_dir: Path | None = None
    try:
        logger.info("开始执行 SQL 脚本...")
        temp_work_dir = CACHE_DIR / task_id
        temp_work_dir.mkdir(parents=True, exist_ok=True)

        processor = DataProcessor(state.config, temp_work_dir, logger)
        processor._execute_sql_script()
        logger.success("SQL 脚本执行完成")
        state.processing_tasks[task_id] = {"logs": logs.copy(), "status": "completed"}
    except Exception as exc:
        logger.error(f"SQL 脚本执行失败: {exc}")
        state.processing_tasks[task_id] = {"logs": logs.copy(), "status": "failed"}
    finally:
        if temp_work_dir and temp_work_dir.exists():
            shutil.rmtree(temp_work_dir, ignore_errors=True)
        state.reset_task_lock()