##############################################################################
# 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
##############################################################################

import json
import logging.config
import os
import sys

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

from storperf.storperf_master import StorPerfMaster


class ReverseProxied(object):
    '''Wrap the application in this middleware and configure the
    front-end server to add these headers, to let you quietly bind
    this to a URL other than / and to an HTTP scheme that is
    different than what is used locally.

    In nginx:
    location /storperf/ {
        proxy_pass http://localhost:8085/;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Scheme $scheme;
        proxy_set_header X-Script-Name /storperf;
    }

    :param app: the WSGI application
    '''
    def __init__(self, app):
        self.app = app

    def __call__(self, environ, start_response):
        script_name = environ.get('HTTP_X_SCRIPT_NAME', '')
        if script_name:
            environ['SCRIPT_NAME'] = script_name
            path_info = environ['PATH_INFO']
            if path_info.startswith(script_name):
                environ['PATH_INFO'] = path_info[len(script_name):]

        scheme = environ.get('HTTP_X_SCHEME', '')
        if scheme:
            environ['wsgi.url_scheme'] = scheme
        return self.app(environ, start_response)


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

storperf = StorPerfMaster()


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

    @swagger.operation(
        notes="Fetch logs",
        parameters=[
            {
                "name": "lines",
                "description": "The number of lines to fetch",
                "required": "False",
                "type": "string",
                "allowedMultiple": "False",
                "paramType": "query"
            }
        ]
    )
    def get(self):
        lines = request.args.get('lines')
        if lines:
            try:
                lines = int(lines)
            except Exception:
                pass
        else:
            lines = 35
        return jsonify({'logs': storperf.get_logs(lines)})


@swagger.model
class ConfigurationRequestModel:
    resource_fields = {
        'agent_count': fields.Integer,
        'agent_flavor': fields.String,
        'agent_image': fields.String,
        'public_network': fields.String,
        'volume_size': fields.Integer,
        'availability_zone': fields.String,
        'username': fields.String,
        'password': fields.String
    }


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


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,
                        'agent_flavor': storperf.agent_flavor,
                        'agent_image': storperf.agent_image,
                        'public_network': storperf.public_network,
                        'volume_size': storperf.volume_size,
                        'stack_created': storperf.is_stack_created,
                        'availability_zone': storperf.availability_zone,
                        'stack_id': storperf.stack_id})

    @swagger.operation(
        notes='''Set the current agent configuration and create a stack in
        the controller.  Returns once the stack create is completed.''',
        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 ('agent_flavor' in request.json):
                storperf.agent_flavor = request.json['agent_flavor']
            if ('agent_image' in request.json):
                storperf.agent_image = request.json['agent_image']
            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']
            if ('availability_zone' in request.json):
                storperf.availability_zone = request.json['availability_zone']
            if ('username' in request.json):
                storperf.username = request.json['username']
            if ('password' in request.json):
                storperf.password = request.json['password']

            storperf.create_stack()
            if storperf.stack_id is None:
                abort(400, storperf.status_reason)

            return jsonify({'agent_count': storperf.agent_count,
                            'agent_flavor': storperf.agent_flavor,
                            'agent_image': storperf.agent_image,
                            'availability_zone': storperf.availability_zone,
                            '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,
        'deadline': fields.Integer,
        "steady_state_samples": fields.Integer,
        'workload': fields.String,
        'queue_depths': fields.String,
        'block_sizes': 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 metrics of the specified workload',
        parameters=[
            {
                "name": "id",
                "description": "The UUID of the workload in the format "
                "NNNNNNNN-NNNN-NNNN-NNNN-NNNNNNNNNNNN",
                "required": False,
                "type": "string",
                "allowMultiple": False,
                "paramType": "query"
            },
            {
                "name": "type",
                "description": "The type of metrics to report. May be "
                "metrics (default), metadata, or status",
                "required": False,
                "type": "string",
                "allowMultiple": False,
                "paramType": "query"
            }
        ],
        responseMessages=[
            {
                "code": 200,
                "message": "Workload ID found, response in JSON format"
            },
            {
                "code": 404,
                "message": "Workload ID not found"
            }
        ]
    )
    def get(self):

        workload_id = request.args.get('id')

        if workload_id:
            metrics_type = "metrics"
            if request.args.get('type'):
                metrics_type = request.args.get('type')

            if metrics_type == "metrics":
                return jsonify(storperf.fetch_results(workload_id))

            if metrics_type == "metadata":
                return jsonify(storperf.fetch_metadata(workload_id))

            if metrics_type == "status":
                return jsonify(storperf.fetch_job_status(workload_id))

        else:
            metrics_type = None
            if request.args.get('type'):
                metrics_type = request.args.get('type')

            if metrics_type == "status":
                return jsonify(storperf.fetch_job_status(workload_id))

            else:
                return jsonify(storperf.fetch_all_jobs(metrics_type))

    @swagger.operation(
        parameters=[
            {
                "name": "body",
                "description": """Start execution of a workload with the
following parameters:

"target": The target device to profile",

"deadline": if specified, the maximum duration in minutes
for any single test iteration.

"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 ('deadline' in request.json):
                storperf.deadline = request.json['deadline']
            if ('steady_state_samples' in request.json):
                storperf.steady_state_samples = request.json[
                    'steady_state_samples']
            if ('queue_depths' in request.json):
                storperf.queue_depths = request.json['queue_depths']
            if ('block_sizes' in request.json):
                storperf.block_sizes = request.json['block_sizes']
            if ('workload' in request.json):
                storperf.workloads = request.json['workload']
            else:
                storperf.workloads = None
            if ('metadata' in request.json):
                metadata = request.json['metadata']
            else:
                metadata = {}

            job_id = storperf.execute_workloads(metadata)

            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):
        self.logger.info("Threads: %s" % sys._current_frames())
        print sys._current_frames()
        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='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/configurations")
api.add_resource(Quota, "/api/v1.0/quotas")
api.add_resource(Job, "/api/v1.0/jobs")
api.add_resource(Logs, "/api/v1.0/logs")

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

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