import uuid
from datetime import datetime, timedelta, timezone

from fastapi import APIRouter, Request, Depends
from fastapi.responses import RedirectResponse
from web.templates_env import templates
from sqlalchemy.orm import Session

from web.auth import hash_password
from web.config import settings
from web.database import get_db
from web.models import User
from web.schemas import validate_reset_password

router = APIRouter()


@router.get("/forgot-password")
def forgot_form(request: Request):
    return templates.TemplateResponse("forgot_password.html", {"request": request, "user": None})


@router.post("/forgot-password")
async def forgot_submit(request: Request, db: Session = Depends(get_db)):
    form = await request.form()
    email = form.get("email", "").strip()

    if email:
        user = db.query(User).filter(User.email == email).first()
        if user:
            token = uuid.uuid4().hex
            user.password_reset_token = token
            user.password_reset_expires = datetime.now(timezone.utc) + timedelta(
                minutes=settings.PASSWORD_RESET_EXPIRE_MINUTES
            )
            db.commit()

            reset_url = f"{settings.BASE_URL}/reset-password?token={token}"
            print("=" * 40)
            print("СБРОС ПАРОЛЯ")
            print(f"Пользователь: {user.email}")
            print(f"Ссылка: {reset_url}")
            print(f"Действительна: {settings.PASSWORD_RESET_EXPIRE_MINUTES} мин.")
            print("=" * 40)

    return templates.TemplateResponse("message.html", {
        "request": request, "user": None,
        "title": "Сброс пароля",
        "message": "Если аккаунт с таким email существует, мы отправили письмо со ссылкой для сброса пароля.",
    })


@router.get("/reset-password")
def reset_form(request: Request, token: str, db: Session = Depends(get_db)):
    user = db.query(User).filter(User.password_reset_token == token).first()
    if not user or not user.password_reset_expires:
        return templates.TemplateResponse("message.html", {
            "request": request, "user": None,
            "title": "Ошибка", "message": "Неверная или устаревшая ссылка.",
        })

    if datetime.now(timezone.utc) > user.password_reset_expires.replace(tzinfo=timezone.utc):
        return templates.TemplateResponse("message.html", {
            "request": request, "user": None,
            "title": "Ошибка", "message": "Срок действия ссылки истек.",
        })

    return templates.TemplateResponse("reset_password.html", {
        "request": request, "user": None, "token": token,
    })


@router.post("/reset-password")
async def reset_submit(request: Request, token: str, db: Session = Depends(get_db)):
    user = db.query(User).filter(User.password_reset_token == token).first()
    if not user or not user.password_reset_expires:
        return templates.TemplateResponse("message.html", {
            "request": request, "user": None,
            "title": "Ошибка", "message": "Неверная или устаревшая ссылка.",
        })

    if datetime.now(timezone.utc) > user.password_reset_expires.replace(tzinfo=timezone.utc):
        return templates.TemplateResponse("message.html", {
            "request": request, "user": None,
            "title": "Ошибка", "message": "Срок действия ссылки истек.",
        })

    form = await request.form()
    data = dict(form)
    errors = validate_reset_password(data)

    if errors:
        return templates.TemplateResponse("reset_password.html", {
            "request": request, "user": None, "token": token, "errors": errors,
        })

    user.password_hash = hash_password(data["password"])
    user.password_reset_token = None
    user.password_reset_expires = None
    db.commit()

    return templates.TemplateResponse("message.html", {
        "request": request, "user": None,
        "title": "Пароль изменен",
        "message": "Ваш пароль успешно изменен. Теперь вы можете войти.",
        "link": "/login", "link_text": "Войти",
    })