#!/usr/bin/env python
"""
 Copyright 2017-present Open Networking Laboratory
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
"""

from flask import Flask, jsonify, request

app = Flask(__name__)
controller_list = {}

"""
Onos Distributed Manager
this app handles controller information in system

Message Samples :
--Adding node
curl  -H "Content-Type: application/json" -X POST
     --data '{"Id":"1.2.3.4","IpAddress":"1.2.3.4","Port":3456,"IsEnable":true}' http://localhost:5000
--Updating node
curl  -H "Content-Type: application/json" -X PUT --data '{"Id":"1.2.3.4","IsEnable":false}' http://localhost:5000
--Deleting node
curl  -H "Content-Type: application/json" -X DELETE --data '{"Id":"1.2.3.4","IsEnable":false}' http://localhost:5000
--Getting node data
curl  -X GET  http://10.15.176.228:5000/cluster.json

"""

httpStatusOK = 200
httpStatusNotFound = 404
httpStatusBadRequest = 400

@app.route('/', methods=['GET'])
def data_get_handler():

    pagereturn = "<h2> Onos Distributed Controller Manager2 </h2>"
    pagereturn += "<br><h3> Status of Added controllers  </h3><br>"
    pagereturn += " Id,&emsp; Ip,&emsp; Port,&emsp; Is Active <br> "

    for key in controller_list.keys():
        pagereturn += controller_list[key]["Id"] + ",&emsp; " + \
                      controller_list[key]["IpAddress"] + ",&emsp; " + \
                      str(controller_list[key]["Port"]) + ",&emsp; " + \
                      str(controller_list[key]["IsEnable"])
        pagereturn += " <br>"

    return pagereturn, httpStatusOK


@app.route('/', methods=['POST'])
def data_post_handler():

    if request.is_json:
        content = dict(request.json)

        if content["Id"] in controller_list:
            return "Content Id is already in the list", httpStatusBadRequest

        else:
            controller_list[content["Id"]] = content

    else:
        return "json required", httpStatusBadRequest

    return "POST called with content", httpStatusOK


@app.route('/', methods=['PUT'])
def data_put_handler():

    if request.is_json:
        content = dict(request.json)

        if content["Id"] in controller_list:
            controller_list[content["Id"]] = content
            return "Update succeeded", httpStatusOK

        else:
            return "Id %s is not found " %(content["Id"]), httpStatusNotFound
    else:
        return "json data is missing", httpStatusBadRequest


@app.route('/', methods=['DELETE'])
def data_delete_handler():

    if request.is_json:
        content = dict(request.json)

    else:
        return "No json is found", httpStatusBadRequest

    if content["Id"] in controller_list:
        del controller_list[content["Id"]]
        return "Deletion succeed.", httpStatusOK

    else:
        return "Id is not found", httpStatusNotFound

"""
This function returns onos cluster information
based on data in memory
"""


@app.route('/cluster.json', methods=['GET'])
def cluster_responder():

    cluster_info = dict()
    nodes = list()
    partition = dict()
    # Todo: For first release , only 1 partition implemented
    cluster_members = list()

    # "nodes" array
    for controller_id in controller_list:
        controller_node = controller_list[controller_id]
        if controller_node["IsEnable"]:
            node_data = dict()
            node_data["ip"] = controller_node["IpAddress"]
            node_data["id"] = controller_node["Id"]
            node_data["port"] = controller_node["Port"]
            nodes.append(node_data)
            cluster_members.append(controller_node["Id"])

    partition["id"] = 1  # Todo: this will be updated .
    partition["members"] = cluster_members

    cluster_info["nodes"] = nodes
    cluster_info["name"] = -1394421542720337000
    cluster_info["partitions"] = partition
    return jsonify(cluster_info), httpStatusOK

if __name__ == '__main__':
    app.run(host="0.0.0.0", debug=True)