#!/usr/bin/env python3
#
#  IRIS Source Code
#  contact@dfir-iris.org
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public
#  License as published by the Free Software Foundation; either
#  version 3 of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#  Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
import marshmallow
from typing import Union

from flask import Blueprint, Response, url_for, render_template, request
from werkzeug.utils import redirect

from app import db
from app.datamgmt.manage.manage_case_classifications_db import get_case_classifications_list, \
    get_case_classification_by_id, search_classification_by_name
from app.forms import CaseClassificationForm
from app.iris_engine.utils.tracker import track_activity
from app.models.authorization import Permissions
from app.schema.marshables import CaseClassificationSchema
from app.util import ac_api_requires, response_error, ac_requires
from app.util import response_success

manage_case_classification_blueprint = Blueprint('manage_case_classifications',
                                                 __name__,
                                                 template_folder='templates')


# CONTENT ------------------------------------------------
@manage_case_classification_blueprint.route('/manage/case-classifications/list', methods=['GET'])
@ac_api_requires(no_cid_required=True)
def list_case_classifications(caseid: int) -> Response:
    """Get the list of case classifications

    Args:
        caseid (int): case id

    Returns:
        Flask Response object

    """
    l_cl = get_case_classifications_list()

    return response_success("", data=l_cl)


@manage_case_classification_blueprint.route('/manage/case-classifications/<int:classification_id>', methods=['GET'])
@ac_api_requires(no_cid_required=True)
def get_case_classification(classification_id: int, caseid: int) -> Response:
    """Get a case classification

    Args:
        classification_id (int): case classification id
        caseid (int): case id

    Returns:
        Flask Response object
    """

    schema = CaseClassificationSchema()
    case_classification = get_case_classification_by_id(classification_id)
    if not case_classification:
        return response_error(f"Invalid case classification ID {classification_id}")

    return response_success("", data=schema.dump(case_classification))


@manage_case_classification_blueprint.route('/manage/case-classifications/update/<int:classification_id>/modal',
                                            methods=['GET'])
@ac_requires(Permissions.server_administrator, no_cid_required=True)
def update_case_classification_modal(classification_id: int, caseid: int, url_redir: bool) -> Union[str, Response]:
    """Update a case classification

    Args:
        classification_id (int): case classification id
        caseid (int): case id
        url_redir (bool): redirect to url

    Returns:
        Flask Response object or str
    """
    if url_redir:
        return redirect(url_for('manage_case_classification_blueprint.update_case_classification_modal',
                                classification_id=classification_id, caseid=caseid))

    classification_form = CaseClassificationForm()
    case_classification = get_case_classification_by_id(classification_id)
    if not case_classification:
        return response_error(f"Invalid case classification ID {classification_id}")

    classification_form.name.render_kw = {'value': case_classification.name}
    classification_form.name_expanded.render_kw = {'value': case_classification.name_expanded}
    classification_form.description.render_kw = {'value': case_classification.description}

    return render_template("modal_case_classification.html", form=classification_form,
                           case_classification=case_classification)


@manage_case_classification_blueprint.route('/manage/case-classifications/update/<int:classification_id>',
                                            methods=['POST'])
@ac_api_requires(Permissions.server_administrator, no_cid_required=True)
def update_case_classification(classification_id: int, caseid: int) -> Response:
    """Update a case classification

    Args:
        classification_id (int): case classification id
        caseid (int): case id

    Returns:
        Flask Response object
    """
    if not request.is_json:
        return response_error("Invalid request")

    case_classification = get_case_classification_by_id(classification_id)
    if not case_classification:
        return response_error(f"Invalid case classification ID {classification_id}")

    ccl = CaseClassificationSchema()

    try:

        ccls = ccl.load(request.get_json(), instance=case_classification)

        if ccls:
            track_activity(f"updated case classification {ccls.id}", caseid=caseid)
            return response_success("Case classification updated", ccl.dump(ccls))

    except marshmallow.exceptions.ValidationError as e:
        return response_error(msg="Data error", data=e.messages, status=400)

    return response_error("Unexpected error server-side. Nothing updated", data=case_classification)


@manage_case_classification_blueprint.route('/manage/case-classifications/add/modal', methods=['GET'])
@ac_requires(Permissions.server_administrator, no_cid_required=True)
def add_case_classification_modal(caseid: int, url_redir: bool) -> Union[str, Response]:
    """Add a case classification

    Args:
        caseid (int): case id
        url_redir (bool): redirect to url

    Returns:
        Flask Response object or str
    """
    if url_redir:
        return redirect(url_for('manage_case_classification_blueprint.add_case_classification_modal',
                                caseid=caseid))

    classification_form = CaseClassificationForm()

    return render_template("modal_case_classification.html", form=classification_form, case_classification=None)


@manage_case_classification_blueprint.route('/manage/case-classifications/add', methods=['POST'])
@ac_api_requires(Permissions.server_administrator, no_cid_required=True)
def add_case_classification(caseid: int) -> Response:
    """Add a case classification

    Args:
        caseid (int): case id

    Returns:
        Flask Response object
    """
    if not request.is_json:
        return response_error("Invalid request")

    ccl = CaseClassificationSchema()

    try:

        ccls = ccl.load(request.get_json())

        if ccls:
            db.session.add(ccls)
            db.session.commit()

            track_activity(f"added case classification {ccls.name}", caseid=caseid)
            return response_success("Case classification added", ccl.dump(ccls))

    except marshmallow.exceptions.ValidationError as e:
        return response_error(msg="Data error", data=e.messages, status=400)

    return response_error("Unexpected error server-side. Nothing added", data=None)


@manage_case_classification_blueprint.route('/manage/case-classifications/delete/<int:classification_id>',
                                            methods=['POST'])
@ac_api_requires(Permissions.server_administrator, no_cid_required=True)
def delete_case_classification(classification_id: int, caseid: int) -> Response:
    """Delete a case classification

    Args:
        classification_id (int): case classification id
        caseid (int): case id

    Returns:
        Flask Response object
    """
    case_classification = get_case_classification_by_id(classification_id)
    if not case_classification:
        return response_error(f"Invalid case classification ID {classification_id}")

    db.session.delete(case_classification)
    db.session.commit()

    track_activity(f"deleted case classification {case_classification.name}", caseid=caseid)
    return response_success("Case classification deleted")


@manage_case_classification_blueprint.route('/manage/case-classifications/search', methods=['POST'])
@ac_api_requires(no_cid_required=True)
def search_alert_status(caseid):
    if not request.is_json:
        return response_error("Invalid request")

    classification_name = request.json.get('classification_name')
    if classification_name is None:
        return response_error("Invalid classification name. Got None")

    exact_match = request.json.get('exact_match', False)

    # Search for classifications with a name that contains the specified search term
    classification = search_classification_by_name(classification_name, exact_match=exact_match)
    if not classification:
        return response_error("No classification found")

    # Serialize the case classification and return them in a JSON response
    schema = CaseClassificationSchema(many=True)
    return response_success("", data=schema.dump(classification))