from fastapi import APIRouter, Request, Depends
from fastapi.responses import RedirectResponse
from fastapi.templating import Jinja2Templates
from sqlalchemy.orm import Session

from web.auth import get_current_user, verify_password, hash_password
from web.database import get_db
from web.models import User
from web.schemas import validate_profile, validate_reset_password

router = APIRouter()
templates = Jinja2Templates(directory="web/templates")


# VIEW PROFILE
@router.get("/profile")
def profile_view(request: Request, user: User | None = Depends(get_current_user)):
    if not user:
        return RedirectResponse("/login", 303)
    return templates.TemplateResponse("profile_view.html", {"request": request, "user": user})


# EDIT PROFILE
@router.get("/profile/edit")
def profile_edit_form(request: Request, user: User | None = Depends(get_current_user)):
    if not user:
        return RedirectResponse("/login", 303)
    return templates.TemplateResponse("profile_edit.html", {"request": request, "user": user})


@router.post("/profile/edit")
async def profile_edit_submit(
    request: Request,
    db: Session = Depends(get_db),
    user: User | None = Depends(get_current_user),
):
    if not user:
        return RedirectResponse("/login", 303)

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

    errors = validate_profile(data)

    if not errors:
        existing = db.query(User).filter(
            User.phone == data["phone"].strip(), User.id != user.id
        ).first()
        if existing:
            errors.append("Пользователь с таким телефоном уже существует")

    if errors:
        return templates.TemplateResponse("profile_edit.html", {
            "request": request, "user": user, "errors": errors, "form": data,
        })

    user.first_name = data["first_name"].strip()
    user.last_name = data["last_name"].strip()
    user.phone = data["phone"].strip()
    db.commit()

    return templates.TemplateResponse("profile_edit.html", {
        "request": request, "user": user, "success": "Профиль обновлен",
    })


# CHANGE PASSWORD
@router.get("/profile/change-password")
def change_password_form(request: Request, user: User | None = Depends(get_current_user)):
    if not user:
        return RedirectResponse("/login", 303)
    return templates.TemplateResponse("profile_change_password.html", {"request": request, "user": user})


@router.post("/profile/change-password")
async def change_password_submit(
    request: Request,
    db: Session = Depends(get_db),
    user: User | None = Depends(get_current_user),
):
    if not user:
        return RedirectResponse("/login", 303)

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

    errors = []
    current_password = data.get("current_password", "")
    if not current_password:
        errors.append("Введите текущий пароль")
    elif not verify_password(current_password, user.password_hash):
        errors.append("Неверный текущий пароль")

    password_errors = validate_reset_password(data)
    errors.extend(password_errors)

    if errors:
        return templates.TemplateResponse("profile_change_password.html", {
            "request": request, "user": user, "errors": errors,
        })

    user.password_hash = hash_password(data["password"])
    db.commit()

    return templates.TemplateResponse("profile_change_password.html", {
        "request": request, "user": user, "success": "Пароль изменен",
    })


# DELETE ACCOUNT
@router.get("/profile/delete")
def delete_account_form(request: Request, user: User | None = Depends(get_current_user)):
    if not user:
        return RedirectResponse("/login", 303)
    return templates.TemplateResponse("profile_delete.html", {"request": request, "user": user})


@router.post("/profile/delete")
async def delete_account_submit(
    request: Request,
    db: Session = Depends(get_db),
    user: User | None = Depends(get_current_user),
):
    if not user:
        return RedirectResponse("/login", 303)

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

    password = data.get("password", "")
    if not password:
        return templates.TemplateResponse("profile_delete.html", {
            "request": request, "user": user, "errors": ["Введите пароль для подтверждения"],
        })

    if not verify_password(password, user.password_hash):
        return templates.TemplateResponse("profile_delete.html", {
            "request": request, "user": user, "errors": ["Неверный пароль"],
        })

    db.delete(user)
    db.commit()
    request.session.clear()

    return RedirectResponse("/", 303)