text: import typing as t
  from flask import flash
  from flask import redirect
  from flask import render_template
  from flask import url_for
  from flask_login.utils import login_user
  from flask_login.utils import logout_user
  from sqlalchemy.orm.attributes import InstrumentedAttribute
  
  from ...blueprints import Blueprint
  from ...extensions import db
  from ...globals import current_app
  from ...globals import g
  from ...globals import request
  from ...helpers import get_model_form
  from .decorators import admin_required
  from .forms import LoginForm
  
  admin_bp = Blueprint("admin", __name__)
  
  
  @admin_bp.route("/")
  @admin_required
  def index():
      blueprints = current_app.blueprint_objects
      return render_template(
          "djask-admin/dashboard.html",
          User=g.User,
          models=current_app.models,
          blueprints=blueprints,
      )
  
  
  @admin_bp.route("/login", methods=["GET", "POST"])
  def login():
      form = LoginForm()
      if form.validate_on_submit():
          user = g.User.query.filter_by(username=form.username.data).first()
          # identify the user
          if not user:
              flash("User not found.", "danger")
          elif not user.is_admin:
              flash("User not administrative.", "danger")
          elif not user.check_password(form.password.data):
              flash("Wrong password.", "danger")
          else:
              login_user(user, form.remember_me.data)
              next: t.Optional[str] = request.args.get("next")
              return redirect(next or url_for("admin.index"))
      return render_template("djask-admin/login.html", form=form)
  
  
  @admin_bp.route("/logout")
  def logout():
      logout_user()
      return redirect(url_for("admin.login"))
  
  
  @admin_bp.route("/<model_name>")
  @admin_required
  def specific_model(model_name: str):
      model = current_app.get_model_by_name(model_name)
      schema = {}
      for name, value in model.__dict__.items():
          if isinstance(value, InstrumentedAttribute):
              try:
                  type = value.type.__repr__()
              except Exception:  # pragma: no cover
                  type = f"Relationship({value.prop.argument})"
              schema[name] = type
      instances = model.query.all()
      return render_template(
          "djask-admin/model.html",
          model=model,
          model_name=model.__name__,
          schema=schema,
          instances=instances,
      )
  
  
  @admin_bp.route(
      "/<model_name>/add",
      methods=(
          "GET",
          "POST",
      ),
  )
  @admin_required
  def add_model(model_name: str):
      model, form = get_model_form(model_name)
      if form.validate_on_submit():
          m = model()
          for name in form._fields.keys():
              value = getattr(form, name).data
              if not value:
                  continue
              if model == g.User and name == "password":
                  m.set_password(value)  # type: ignore
              else:
                  setattr(m, name, value)
          db.session.add(m)
          db.session.commit()
          flash(f"A new instance of {model_name} has been created!", "success")
          return redirect(url_for("admin.specific_model", model_name=model.__name__))
      return render_template(
          "djask-admin/model_add.html", form=form, model_name=model.__name__
      )
  
  
  @admin_bp.route(
      "/<model_name>/<int:model_id>",
      methods=(
          "GET",
          "POST",
      ),
  )
  @admin_bp.route(
      "/<model_name>/<int:model_id>/edit",
      methods=(
          "GET",
          "POST",
      ),
  )
  @admin_required
  def edit_model(model_name: str, model_id: int):
      model, form = get_model_form(model_name)
      m = model.query.get(model_id)  # type: ignore
      if m is None:
          return (
              render_template(
                  "djask-admin/model_404.html", model_id=model_id, model_name=model_name
              ),
              404,
          )
  
      if form.validate_on_submit():
          for name in form._fields.keys():
              value = getattr(form, name).data
              if not value:
                  continue
              if model == g.User and name == "password":
                  m.set_password(value)
              else:
                  setattr(m, name, value)
          db.session.commit()
          flash(f"{model_name} id {m.id} has been modified!", "success")
          return redirect(url_for("admin.specific_model", model_name=model.__name__))
      for name in form._fields.keys():
          if (
              not (model == g.User and name == "password")
              and name != "submit"
              and name != "csrf_token"
          ):
              getattr(form, name).data = getattr(m, name)
      return render_template(
          "djask-admin/model_edit.html",
          form=form,
          model_name=model.__name__,
          model_id=model_id,
      )
  