from datetime import datetime

from flask import Blueprint
from flask import flash
from flask import redirect
from flask import render_template
from flask import url_for
from flask_babel import format_timedelta
from flask_babel import gettext
from flask_login import current_user
from flask_login import login_required

from newspipe.controllers import UserController
from newspipe.web.forms import InformationMessageForm
from newspipe.web.forms import UserForm
from newspipe.web.views.common import admin_permission

admin_bp = Blueprint("admin", __name__, url_prefix="/admin")


@admin_bp.route("/dashboard", methods=["GET", "POST"])
@login_required
@admin_permission.require(http_exception=403)
def dashboard():
    last_cons, now = {}, datetime.utcnow()
    users = list(UserController().read().order_by("id"))
    form = InformationMessageForm()
    for user in users:
        last_cons[user.id] = format_timedelta(now - user.last_seen)
    return render_template(
        "admin/dashboard.html",
        now=datetime.utcnow(),
        last_cons=last_cons,
        users=users,
        current_user=current_user,
        form=form,
    )


@admin_bp.route("/user/create", methods=["GET"])
@admin_bp.route("/user/edit/<int:user_id>", methods=["GET"])
@login_required
@admin_permission.require(http_exception=403)
def user_form(user_id=None):
    if user_id is not None:
        user = UserController().get(id=user_id)
        form = UserForm(obj=user)
        message = gettext("Edit the user <i>%(nick)s</i>", nick=user.nickname)
        if user.external_auth:
            message += f" (external auth type: {user.external_auth})"
    else:
        form = UserForm()
        message = gettext("Add a new user")
    return render_template("/admin/create_user.html", form=form, message=message, pw_disabled = bool(user.external_auth))


@admin_bp.route("/user/create", methods=["POST"])
@admin_bp.route("/user/edit/<int:user_id>", methods=["POST"])
@login_required
@admin_permission.require(http_exception=403)
def process_user_form(user_id=None):
    """
    Create or edit a user.
    """
    form = UserForm()
    user_contr = UserController()

    if not form.validate():
        return render_template(
            "/admin/create_user.html",
            form=form,
            message=gettext("Some errors were found"),
        )

    if user_id is not None:
        # Edit a user
        user_contr.update(
            {"id": user_id},
            {
                "nickname": form.nickname.data,
                "password": form.password.data,
                "automatic_crawling": form.automatic_crawling.data,
            },
        )
        user = user_contr.get(id=user_id)
        flash(
            gettext("User %(nick)s successfully updated", nick=user.nickname), "success"
        )
    else:
        # Create a new user (by the admin)
        user = user_contr.create(
            nickname=form.nickname.data,
            password=form.password.data,
            automatic_crawling=form.automatic_crawling.data,
            is_admin=False,
            is_active=True,
        )
        flash(
            gettext("User %(nick)s successfully created", nick=user.nickname), "success"
        )
    return redirect(url_for("admin.user_form", user_id=user.id))


@admin_bp.route("/delete_user/<int:user_id>", methods=["GET"])
@login_required
@admin_permission.require(http_exception=403)
def delete_user(user_id=None):
    """
    Delete a user (with all its data).
    """
    try:
        user = UserController().delete(user_id)
        flash(
            gettext("User %(nick)s successfully deleted", nick=user.nickname), "success"
        )
    except Exception as error:
        flash(
            gettext(
                "An error occurred while trying to delete a user: %(error)s",
                error=error,
            ),
            "danger",
        )
    return redirect(url_for("admin.dashboard"))


@admin_bp.route("/toggle_user/<int:user_id>", methods=["GET"])
@login_required
@admin_permission.require()
def toggle_user(user_id=None):
    """
    Enable or disable the account of a user.
    """
    ucontr = UserController()
    user = ucontr.get(id=user_id)
    user_changed = ucontr.update({"id": user_id}, {"is_active": not user.is_active})

    if not user_changed:
        flash(gettext("This user does not exist."), "danger")
        return redirect(url_for("admin.dashboard"))

    else:
        act_txt = "activated" if user.is_active else "desactivated"
        message = gettext(
            "User %(nickname)s successfully %(is_active)s",
            nickname=user.nickname,
            is_active=act_txt,
        )
    flash(message, "success")
    return redirect(url_for("admin.dashboard"))