from fastapi import APIRouter, Depends, Request
from fastapi.responses import HTMLResponse, RedirectResponse
from sqlalchemy import or_
from sqlalchemy.orm import Session

from web.auth.password import hash_password, verify_password
from web.auth.session import get_current_user
from web.config import settings
from web.database import get_db
from web.models.user import User
from web.templates_env import templates

router = APIRouter()


def _render(request: Request, template: str, ctx: dict) -> HTMLResponse:
    ctx["request"] = request
    ctx.setdefault("jivosite_widget_id", settings.JIVOSITE_WIDGET_ID)
    return templates.TemplateResponse(ctx.pop("request"), template, ctx)


@router.get("/profile")
async def profile_view(request: Request, db: Session = Depends(get_db)):
    try:
        user = get_current_user(request, db)
    except Exception:
        return RedirectResponse("/login", 303)
    return _render(request, "profile_view.html", {"user": user})


@router.get("/profile/edit")
async def profile_edit_get(request: Request, db: Session = Depends(get_db)):
    try:
        user = get_current_user(request, db)
    except Exception:
        return RedirectResponse("/login", 303)
    return _render(request, "profile_edit.html", {"user": user})


@router.post("/profile/edit")
async def profile_edit_post(request: Request, db: Session = Depends(get_db)):
    try:
        user = get_current_user(request, db)
    except Exception:
        return RedirectResponse("/login", 303)

    form = await request.form()
    data = {k: str(v).strip() for k, v in form.items()}
    errors = []

    if not data.get("first_name"):
        errors.append("Имя обязательно")
    if not data.get("last_name"):
        errors.append("Фамилия обязательна")
    if not data.get("phone"):
        errors.append("Телефон обязателен")

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

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

    user.first_name = data["first_name"]
    user.last_name = data["last_name"]
    user.phone = data["phone"]
    db.commit()
    return _render(request, "profile_edit.html", {
        "user": user, "success": "Профиль обновлён",
    })


@router.get("/profile/change-password")
async def change_pw_get(request: Request, db: Session = Depends(get_db)):
    try:
        user = get_current_user(request, db)
    except Exception:
        return RedirectResponse("/login", 303)
    return _render(request, "profile_change_password.html", {"user": user})


@router.post("/profile/change-password")
async def change_pw_post(request: Request, db: Session = Depends(get_db)):
    try:
        user = get_current_user(request, db)
    except Exception:
        return RedirectResponse("/login", 303)

    form = await request.form()
    current = str(form.get("current_password", ""))
    new_pw = str(form.get("password", ""))
    confirm = str(form.get("password_confirm", ""))
    errors = []

    if not user.password_hash or not verify_password(current, user.password_hash):
        errors.append("Неверный текущий пароль")
    if len(new_pw) < 8:
        errors.append("Новый пароль должен содержать минимум 8 символов")
    if new_pw != confirm:
        errors.append("Пароли не совпадают")

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

    user.password_hash = hash_password(new_pw)
    db.commit()
    return _render(request, "profile_change_password.html", {
        "user": user, "success": "Пароль изменён",
    })


@router.get("/profile/delete")
async def delete_get(request: Request, db: Session = Depends(get_db)):
    try:
        user = get_current_user(request, db)
    except Exception:
        return RedirectResponse("/login", 303)
    return _render(request, "profile_delete.html", {"user": user})


@router.post("/profile/delete")
async def delete_post(request: Request, db: Session = Depends(get_db)):
    try:
        user = get_current_user(request, db)
    except Exception:
        return RedirectResponse("/login", 303)

    form = await request.form()
    password = str(form.get("password", ""))

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

    db.delete(user)
    db.commit()
    request.session.clear()
    return RedirectResponse("/login", 303)