##############################################################################
# Copyright (c) 2015 EMC and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################

from storperf.storperf_master import StorPerfMaster
import json
import logging
import logging.config
import os

from flask import abort, Flask, request, jsonify, send_from_directory
from flask_restful import Resource, Api, fields
from flask_restful_swagger import swagger

app = Flask(__name__, static_url_path="")
api = swagger.docs(Api(app), apiVersion='1.0')

storperf = StorPerfMaster()


@app.route('/swagger/<path:path>')
def send_swagger(path):
    return send_from_directory('storperf/resources/html/swagger', path)


@swagger.model
class ConfigurationRequestModel:
    resource_fields = {
        'agent_count': fields.Integer,
        'public_network': fields.String,
        'volume_size': fields.Integer
    }


@swagger.model
class ConfigurationResponseModel:
    resource_fields = {
        'agent_count': fields.Integer,
        'public_network': fields.String,
        'stack_created': fields.Boolean,
        'stack_id': fields.String,
        'volume_size': fields.Integer
    }


class Configure(Resource):

    """Configuration API"""

    def __init__(self):
        self.logger = logging.getLogger(__name__)

    @swagger.operation(
        notes='Fetch the current agent configuration',
        type=ConfigurationResponseModel.__name__
    )
    def get(self):
        return jsonify({'agent_count': storperf.agent_count,
                        'public_network': storperf.public_network,
                        'volume_size': storperf.volume_size,
                        'stack_created': storperf.is_stack_created,
                        'stack_id': storperf.stack_id})

    @swagger.operation(
        notes='''Set the current agent configuration and create a stack in
        the controller.  Returns once the stack request is submitted.''',
        parameters=[
            {
                "name": "configuration",
                "description": '''Configuration to be set. All parameters are
                optional, and will retain their previous value if not
                specified.  Volume size is in GB.
                ''',
                "required": True,
                "type": "ConfigurationRequestModel",
                "paramType": "body"
            }
        ],
        type=ConfigurationResponseModel.__name__
    )
    def post(self):
        if not request.json:
            abort(400, "ERROR: No data specified")

        try:
            if ('agent_count' in request.json):
                storperf.agent_count = request.json['agent_count']
            if ('public_network' in request.json):
                storperf.public_network = request.json['public_network']
            if ('volume_size' in request.json):
                storperf.volume_size = request.json['volume_size']

            storperf.validate_stack()
            storperf.create_stack()

            return jsonify({'agent_count': storperf.agent_count,
                            'public_network': storperf.public_network,
                            'volume_size': storperf.volume_size,
                            'stack_id': storperf.stack_id})

        except Exception as e:
            abort(400, str(e))

    @swagger.operation(
        notes='Deletes the agent configuration and the stack'
    )
    def delete(self):
        try:
            storperf.delete_stack()
        except Exception as e:
            abort(400, str(e))


@swagger.model
class WorkloadModel:
    resource_fields = {
        'target': fields.String,
        'nossd': fields.String,
        'nowarm': fields.String,
        'workload': fields.String,
    }


@swagger.model
class WorkloadResponseModel:
    resource_fields = {
        'job_id': fields.String
    }


class Job(Resource):

    """Job API"""

    def __init__(self):
        self.logger = logging.getLogger(__name__)

    @swagger.operation(
        notes='Fetch the average latency of the specified workload',
        parameters=[
            {
                "name": "id",
                "description": "The UUID of the workload in the format "
                "NNNNNNNN-NNNN-NNNN-NNNN-NNNNNNNNNNNN",
                "required": True,
                "type": "string",
                "allowMultiple": False,
                "paramType": "query"
            }
        ],
        responseMessages=[
            {
                "code": 200,
                "message": "Wordload ID found, response in JSON format"
            },
            {
                "code": 404,
                "message": "Workload ID not found"
            }
        ]
    )
    def get(self):
        workload_id = request.args.get('id')
        print workload_id
        return jsonify(storperf.fetch_results(workload_id))

    @swagger.operation(
        parameters=[
            {
                "name": "body",
                "description": 'Start execution of a workload with the '
                'following parameters: "target": The target device to '
                'profile", "nossd": Do not fill the target with random '
                'data prior to running the test, "nowarm": Do not '
                'refill the target with data '
                'prior to running any further tests, "workload":if specified, '
                'the workload to run. Defaults to all.',
                "required": True,
                "type": "WorkloadModel",
                "paramType": "body"
            }
        ],
        type=WorkloadResponseModel.__name__,
        responseMessages=[
            {
                "code": 200,
                "message": "Job submitted"
            },
            {
                "code": 400,
                "message": "Missing configuration data"
            }
        ]
    )
    def post(self):
        if not request.json:
            abort(400, "ERROR: Missing configuration data")

        self.logger.info(request.json)

        try:
            if ('target' in request.json):
                storperf.filename = request.json['target']
            if ('nossd' in request.json):
                storperf.precondition = False
            if ('nowarm' in request.json):
                storperf.warm_up = False
            if ('workload' in request.json):
                storperf.workloads = request.json['workload']
            else:
                storperf.workloads = None
            # Add block size, queue depth, number of passes here.
            if ('workload' in request.json):
                storperf.workloads = request.json['workload']

            job_id = storperf.execute_workloads()

            return jsonify({'job_id': job_id})

        except Exception as e:
            abort(400, str(e))

    @swagger.operation(
        notes='Cancels the currently running workload',
        responseMessages=[
            {
                "code": 200,
                "message": "Wordload ID found, response in JSON format"
            },
        ]
    )
    def delete(self):
        try:
            return jsonify({'Slaves': storperf.terminate_workloads()})
        except Exception as e:
            abort(400, str(e))


@swagger.model
class QuotaModel:

    resource_fields = {
        'quota': fields.Integer
    }


class Quota(Resource):
    """Quota API"""

    @swagger.operation(
        notes='''Fetch the current Cinder volume quota.  This value limits
        the number of volumes that can be created, and by extension, defines
        the maximum number of agents that can be created for any given test
        scenario''',
        type=QuotaModel.__name__
    )
    def get(self):
        quota = storperf.volume_quota
        return jsonify({'quota': quota})


def setup_logging(default_path='storperf/logging.json',
                  default_level=logging.INFO, env_key='LOG_CFG'):
    """Setup logging configuration
    """

    path = default_path
    value = os.getenv(env_key, None)
    if value:
        path = value
    if os.path.exists(path):
        with open(path, 'rt') as f:
            config = json.load(f)
        logging.config.dictConfig(config)
    else:
        logging.basicConfig(level=default_level)

    socketHandler = logging.handlers.DatagramHandler(
        'localhost', logging.handlers.DEFAULT_UDP_LOGGING_PORT)
    rootLogger = logging.getLogger('')
    rootLogger.addHandler(socketHandler)


api.add_resource(Configure, "/api/v1.0/configure")
api.add_resource(Quota, "/api/v1.0/quota")
api.add_resource(Job, "/api/v1.0/job")

if __name__ == "__main__":
    setup_logging()
    logging.getLogger("storperf").setLevel(logging.DEBUG)

    app.run(host='0.0.0.0', debug=True)