"""Import/export routes — CSV import, dry-run preview, CSV/XLSX export."""

from __future__ import annotations

import uuid
from typing import Any

from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, Form, Query, Response, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.auth import check_permission
from app.core.db import get_db
from app.deps import get_current_user
from app.services import import_export_service
from app.services import company_service

router = APIRouter(prefix="/api/v1", tags=["import_export"])


@router.post("/import")
async def import_csv(
    file: UploadFile = File(...),
    entity_type: str = Form("companies"),
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(get_current_user),
):
    """Import companies or contacts from CSV file.
    entity_type: 'companies' or 'contacts'.
    """
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])
    role = current_user.get("role", "viewer")

    if not check_permission(role, "companies", "create"):
        raise HTTPException(403, detail={"detail": "Insufficient permissions", "code": "forbidden"})

    content = await file.read()
    csv_content = content.decode("utf-8")

    result = await import_export_service.import_csv(
        db, tenant_id, user_id, csv_content, entity_type=entity_type, dry_run=False,
    )
    return result


@router.post("/import/preview")
async def import_csv_preview(
    file: UploadFile = File(...),
    entity_type: str = Form("companies"),
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(get_current_user),
):
    """Preview CSV import (dry-run — no DB changes)."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])
    role = current_user.get("role", "viewer")

    if not check_permission(role, "companies", "read"):
        raise HTTPException(403, detail={"detail": "Insufficient permissions", "code": "forbidden"})

    content = await file.read()
    csv_content = content.decode("utf-8")

    result = await import_export_service.import_csv(
        db, tenant_id, user_id, csv_content, entity_type=entity_type, dry_run=True,
    )
    return result