from __future__ import annotations

from src.utils.logger import get_logger as _get_logger
import logging
import os
import shutil
import tempfile
from pathlib import Path
from typing import Any

from fastapi import APIRouter, HTTPException, UploadFile, File
from pydantic import BaseModel

from src.file_agent.config import file_config
from src.file_agent.tasks import file_process_task

logger = _get_logger(__name__)
router = APIRouter(tags=["file"])

_SUPPORTED_EXTENSIONS = {
    ".pdf", ".docx", ".doc", ".xml", ".txt", ".md",
    ".csv", ".xlsx", ".xls", ".html", ".htm",
}


class FolderRequest(BaseModel):
    folder_path: str
    team_id: str = ""


@router.post("/api/ingest/file")
async def ingest_file(
    file: UploadFile = File(...),
    team_id: str = "",
) -> dict[str, Any]:
    """Upload a file and dispatch it to the ingestion pipeline."""
    suffix = Path(file.filename or "upload").suffix.lower()
    if suffix not in _SUPPORTED_EXTENSIONS:
        raise HTTPException(status_code=400, detail=f"Unsupported file type: {suffix}")

    tmp = tempfile.NamedTemporaryFile(delete=False, suffix=suffix)
    try:
        shutil.copyfileobj(file.file, tmp)
        tmp.close()
        size_kb = round(tmp.seek(0, 2) / 1024, 1) if not tmp.closed else 0
        task = file_process_task.delay(tmp.name, team_id or file_config.team_id)
        logger.info(
            "file_ingest_queued",
            extra={"task_id": task.id, "filename": file.filename, "suffix": suffix, "size_kb": size_kb},
        )
        return {"status": "accepted", "task_id": task.id, "filename": file.filename}
    except Exception as exc:
        os.unlink(tmp.name)
        raise HTTPException(status_code=500, detail=str(exc))


@router.post("/api/ingest/folder")
async def ingest_folder(body: FolderRequest) -> dict[str, Any]:
    """Queue ingestion for all supported files in a folder."""
    folder = Path(body.folder_path)
    if not folder.is_dir():
        raise HTTPException(status_code=400, detail=f"Folder not found: {body.folder_path}")

    team_id = body.team_id or file_config.team_id
    task_ids = []
    for file_path in folder.rglob("*"):
        if file_path.is_file() and file_path.suffix.lower() in _SUPPORTED_EXTENSIONS:
            task = file_process_task.delay(str(file_path), team_id)
            task_ids.append({"task_id": task.id, "file": file_path.name})

    logger.info("file_router: queued %d files from folder %s", len(task_ids), body.folder_path)
    return {"status": "accepted", "tasks": task_ids, "count": len(task_ids)}