import falcon
import simplejson as json
import mysql.connector
import config
import uuid
import re
from core.useractivity import user_logger, access_control
import requests

BASE_API = 'http://172.16.203.116/'
# BASE_API = 'http://192.168.1.4/'


def login():
    url = BASE_API + "/api/v1.0/login"

    payload = json.dumps({
        "username": "admin",
        "password": "123456",
        "type": "account"
    })
    headers = {
        'Content-Type': 'application/json',
    }

    session = requests.session()
    response = session.post(url, headers=headers, data=payload)
    status = response.status_code

    if status == 200:
        return session
    return None


class TicketTypeCollection:
    @staticmethod
    def __init__():
        """"Initializes ContactCollection"""
        pass

    @staticmethod
    def on_options(req, resp):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_get(req, resp):
        cnx = mysql.connector.connect(**config.loonflow)
        cursor = cnx.cursor()

        query = (" SELECT id, name, description, display_form_str "
                 " FROM workflow_workflow "
                 " ORDER BY id ")
        cursor.execute(query)
        rows = cursor.fetchall()
        cursor.close()
        cnx.close()

        result = list()
        if rows is not None and len(rows) > 0:
            for row in rows:
                meta_result = {"id": row[0],
                               "name": row[1],
                               "description": row[2],
                               "display_form_str": row[3]}
                result.append(meta_result)

        resp.text = json.dumps(result)


class TicketApplicationListCollection:
    @staticmethod
    def __init__():
        """"Initializes ContactCollection"""
        pass

    @staticmethod
    def on_options(req, resp):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_post(req, resp):

        try:
            raw_json = req.stream.read().decode('utf-8')
        except Exception as ex:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR', description=ex)
        """
        {
            "user_name": "admin",
        }"""
        new_values = json.loads(raw_json)

        checked_fields = [
            {
                "name": "user_name",
                "type": str
            },
        ]

        for field in checked_fields:
            _name = field['name']
            _type = field['type']
            if _name not in new_values.keys() or \
                    not isinstance(new_values[_name], _type) or \
                    len(str(new_values[_name])) == 0:
                raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                       description='API.INVALID_FIELD' + _name)

        payload = new_values
        user_name = payload['user_name']

        cnx = mysql.connector.connect(**config.loonflow)
        cursor = cnx.cursor()

        query = (" SELECT id, name   "
                 " FROM workflow_workflow "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_rows = cursor.fetchall()

        workflow_result = {}
        if workflow_rows is not None and len(workflow_rows) > 0:
            for row in workflow_rows:
                workflow_result[row[0]] = row[1]

        query = (" SELECT id, name  "
                 " FROM workflow_state "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_state_rows = cursor.fetchall()

        workflow_state_result = {}
        if workflow_state_rows is not None and len(workflow_state_rows) > 0:
            for row in workflow_state_rows:
                workflow_state_result[row[0]] = row[1]

        query = (" SELECT id, title, workflow_id, sn, state_id, creator, gmt_created, gmt_modified "
                 " FROM ticket_ticketrecord "
                 " WHERE creator = %s "
                 " ORDER BY id DESC")
        cursor.execute(query, (user_name,))
        rows = cursor.fetchall()
        cursor.close()
        cnx.close()

        result = list()
        if rows is not None and len(rows) > 0:
            for row in rows:
                meta_result = {"id": row[0],
                               "title": row[1],
                               "ticket_type": workflow_result.get(row[2]),
                               "sn": row[3],
                               "state": workflow_state_result.get(row[4]),
                               "creator": row[5],
                               "gmt_created": str(row[6]),
                               "gmt_modified": str(row[7])
                               }
                result.append(meta_result)

        resp.text = json.dumps(result)


class TicketApplicationItem:
    @staticmethod
    def __init__():
        """"Initializes ContactCollection"""
        pass

    @staticmethod
    def on_options(req, resp, id_):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_get(req, resp, id_):
        if not id_.isdigit() or int(id_) <= 0:
            raise falcon.HTTPError(falcon.HTTP_400, '400 Bad Request')

        result = {
            "id": None,
            "name": None,
            "transition_id": None,
            "workflow_id": int(id_),
            "fields": []
        }

        cnx = mysql.connector.connect(**config.loonflow)
        cursor = cnx.cursor()

        # Get workflow transition id: only the first line
        query = (" SELECT id, name, transition_type_id, source_state_id, destination_state_id "
                 " FROM workflow_transition"
                 " WHERE workflow_id = %s "
                 " ORDER BY id ")
        cursor.execute(query, (id_,))
        rows = cursor.fetchall()

        if rows is not None and len(rows) > 0:
            row = rows[0]
            result['transition_id'] = row[0]

        # Get workflow custom field
        query = (" SELECT id, field_type_id, field_key, field_name, order_id, default_value,  description, "
                 " field_template, boolean_field_display "
                 " FROM workflow_customfield"
                 " WHERE workflow_id = %s "
                 " ORDER BY id ")
        cursor.execute(query, (id_,))
        rows = cursor.fetchall()

        field_result = {}
        field_types = {
            5: 'input',
            55: 'text_area',
        }
        if rows is not None and len(rows) > 0:
            for row in rows:
                field_key = row[2]
                field_result[field_key] = {
                    'id': row[0],
                    'field_type_id': row[1],
                    'field_key': row[2],
                    'field_name': row[3],
                    'order_id': row[4],
                    'default_value': row[5],
                    'description': row[6],
                    'field_template': row[7],
                    'boolean_field_display': row[8],
                    'field_type': field_types.get(row[1]),
                }

        # Get workflow start state
        query = (" SELECT id, name, state_field_str  "
                 " FROM workflow_state "
                 " WHERE workflow_id = %s and type_id = 1"
                 " ORDER BY id ")
        cursor.execute(query, (id_,))
        row = cursor.fetchone()

        workflow_state_id = None
        workflow_state_name = None
        state_field_str = None
        fields = []

        if row is not None and len(row) > 0:
            workflow_state_id = row[0]
            workflow_state_name = row[1]
            state_field_str = json.loads(row[2])
            for key in state_field_str.keys():
                if key == "title":
                    fields.append(
                        {
                            "id": 0,
                            "field_type_id": 5,
                            "field_key": "title",
                            "field_name": "标题",
                            "order_id": 20,
                            "default_value": None,
                            "description": "",
                            "field_template": "",
                            'field_type': field_types.get(5),
                        }
                    )
                if key in field_result.keys():
                    fields.append(field_result[key])
                else:
                    continue

            result['id'] = workflow_state_id
            result['name'] = workflow_state_name
            result['fields'] = fields

        resp.text = json.dumps(result)

    @staticmethod
    def on_post(req, resp, id_):
        """Handles POST requests"""
        try:
            raw_json = req.stream.read().decode('utf-8')
        except Exception as ex:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR', description=ex)
        """
        {
        "title": "测试维修",
        "long_field": "测试维修",
        "transition_id": 29,
        "workflow_id": 4
        }"""
        print("id_", id_)
        new_values = json.loads(raw_json)

        checked_fields = [
            {
                "name": "transition_id",
                "type": int
            },
            {
                "name": "workflow_id",
                "type": int
            },

        ]

        for field in checked_fields:
            _name = field['name']
            _type = field['type']
            if _name not in new_values.keys() or \
                    not isinstance(new_values[_name], _type) or \
                    len(str(new_values[_name])) == 0:
                raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                       description='API.INVALID_FIELD' + _name)

        payload = new_values

        session = login()
        url = BASE_API + "/api/v1.0/tickets"
        headers = {
            'Content-Type': 'application/json',
        }
        resp = session.post(url, headers=headers, data=json.dumps(payload))
        content = json.loads(resp.text)
        print("content", content)
        new_ticket_id = content.get('ticket_id')
        print(resp.status_code)
        if resp.status_code != 200:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_COOKIE',
                                   description='API.INVALID_STATUS_CODE:' + str(resp.status_code))
        resp.status = falcon.HTTP_201
        resp.location = '/tickets/' + str(new_ticket_id)


class TicketAgentListCollection:
    @staticmethod
    def __init__():
        """"Initializes ContactCollection"""
        pass

    @staticmethod
    def on_options(req, resp):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_post(req, resp):

        try:
            raw_json = req.stream.read().decode('utf-8')
        except Exception as ex:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR', description=ex)
        """
        {
            "user_name": "admin",
        }"""
        new_values = json.loads(raw_json)

        checked_fields = [
            {
                "name": "user_name",
                "type": str
            },
        ]

        for field in checked_fields:
            _name = field['name']
            _type = field['type']
            if _name not in new_values.keys() or \
                    not isinstance(new_values[_name], _type) or \
                    len(str(new_values[_name])) == 0:
                raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                       description='API.INVALID_FIELD' + _name)

        payload = new_values
        user_name = payload['user_name']

        cnx = mysql.connector.connect(**config.loonflow)
        cursor = cnx.cursor()

        # Get Ticket ids
        query = (" SELECT id, ticket_id   "
                 " FROM ticket_ticketuser "
                 " WHERE in_process = 1 and worked = 0 "
                 " ORDER BY id DESC ")
        cursor.execute(query)
        rows = cursor.fetchall()

        ticket_ids = []
        if rows is not None and len(rows) > 0:
            for row in rows:
                ticket_id = row[1]
                ticket_ids.append(ticket_id)

        query = (" SELECT id, name   "
                 " FROM workflow_workflow "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_rows = cursor.fetchall()

        workflow_result = {}
        if workflow_rows is not None and len(workflow_rows) > 0:
            for row in workflow_rows:
                workflow_result[row[0]] = row[1]

        query = (" SELECT id, name  "
                 " FROM workflow_state "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_state_rows = cursor.fetchall()

        workflow_state_result = {}
        if workflow_state_rows is not None and len(workflow_state_rows) > 0:
            for row in workflow_state_rows:
                workflow_state_result[row[0]] = row[1]

        query = (" SELECT id, title, workflow_id, sn, state_id, creator, gmt_created, gmt_modified "
                 " FROM ticket_ticketrecord "
                 " WHERE participant = %s  "
                 " ORDER BY id DESC ")
        cursor.execute(query, (user_name,))
        rows = cursor.fetchall()
        cursor.close()
        cnx.close()

        result = list()
        if rows is not None and len(rows) > 0:
            for row in rows:
                _id = row[0]
                if _id not in ticket_ids:
                    continue
                meta_result = {"id": row[0],
                               "title": row[1],
                               "ticket_type": workflow_result.get(row[2]),
                               "sn": row[3],
                               "state": workflow_state_result.get(row[4]),
                               "creator": row[5],
                               "gmt_created": str(row[6]),
                               "gmt_modified": str(row[7])
                               }
                result.append(meta_result)

        resp.text = json.dumps(result)


class TicketCompletedListCollection:
    @staticmethod
    def __init__():
        """"Initializes ContactCollection"""
        pass

    @staticmethod
    def on_options(req, resp):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_post(req, resp):

        try:
            raw_json = req.stream.read().decode('utf-8')
        except Exception as ex:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR', description=ex)
        """
        {
            "user_name": "admin",
        }"""
        new_values = json.loads(raw_json)

        checked_fields = [
            {
                "name": "user_name",
                "type": str
            },
        ]

        for field in checked_fields:
            _name = field['name']
            _type = field['type']
            if _name not in new_values.keys() or \
                    not isinstance(new_values[_name], _type) or \
                    len(str(new_values[_name])) == 0:
                raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                       description='API.INVALID_FIELD' + _name)

        payload = new_values
        user_name = payload['user_name']

        cnx = mysql.connector.connect(**config.loonflow)
        cursor = cnx.cursor()

        # Get Ticket ids: Completed
        query = (" SELECT id, ticket_id   "
                 " FROM ticket_ticketuser "
                 " WHERE username = %s"
                 " ORDER BY id DESC ")
        cursor.execute(query, (user_name,))
        rows = cursor.fetchall()

        ticket_ids = []
        if rows is not None and len(rows) > 0:
            for row in rows:
                ticket_id = row[1]
                if ticket_id not in ticket_ids:
                    ticket_ids.append(ticket_id)

        query = (" SELECT id, name   "
                 " FROM workflow_workflow "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_rows = cursor.fetchall()

        workflow_result = {}
        if workflow_rows is not None and len(workflow_rows) > 0:
            for row in workflow_rows:
                workflow_result[row[0]] = row[1]

        query = (" SELECT id, name  "
                 " FROM workflow_state "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_state_rows = cursor.fetchall()

        workflow_state_result = {}
        if workflow_state_rows is not None and len(workflow_state_rows) > 0:
            for row in workflow_state_rows:
                workflow_state_result[row[0]] = row[1]

        query = (" SELECT id, title, workflow_id, sn, state_id, creator, gmt_created, gmt_modified "
                 " FROM ticket_ticketrecord "
                 " ORDER BY id DESC ")
        cursor.execute(query, )
        rows = cursor.fetchall()
        cursor.close()
        cnx.close()

        result = list()
        if rows is not None and len(rows) > 0:
            for row in rows:
                _id = row[0]
                if _id not in ticket_ids:
                    continue
                meta_result = {"id": row[0],
                               "title": row[1],
                               "ticket_type": workflow_result.get(row[2]),
                               "sn": row[3],
                               "state": workflow_state_result.get(row[4]),
                               "creator": row[5],
                               "gmt_created": str(row[6]),
                               "gmt_modified": str(row[7])
                               }
                result.append(meta_result)

        resp.text = json.dumps(result)


class TicketInterventionListCollection:
    @staticmethod
    def __init__():
        """"Initializes ContactCollection"""
        pass

    @staticmethod
    def on_options(req, resp):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_post(req, resp):

        try:
            raw_json = req.stream.read().decode('utf-8')
        except Exception as ex:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR', description=ex)
        """
        {
            "user_name": "admin",
        }"""
        new_values = json.loads(raw_json)

        checked_fields = [
            {
                "name": "user_name",
                "type": str
            },
        ]

        for field in checked_fields:
            _name = field['name']
            _type = field['type']
            if _name not in new_values.keys() or \
                    not isinstance(new_values[_name], _type) or \
                    len(str(new_values[_name])) == 0:
                raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                       description='API.INVALID_FIELD' + _name)

        payload = new_values
        user_name = payload['user_name']

        if user_name != 'admin':
            raise falcon.HTTPError(falcon.HTTP_401, title='API.UNAUTHENTICATED',
                                   description='API.INVALID_FIELD' + user_name)

        cnx = mysql.connector.connect(**config.loonflow)
        cursor = cnx.cursor()

        # Get Ticket ids: Completed
        query = (" SELECT id, ticket_id   "
                 " FROM ticket_ticketuser "
                 " WHERE username = %s "
                 " ORDER BY id DESC ")
        cursor.execute(query, (user_name,))
        rows = cursor.fetchall()

        ticket_ids = []
        if rows is not None and len(rows) > 0:
            for row in rows:
                ticket_id = row[1]
                if ticket_id not in ticket_ids:
                    ticket_ids.append(ticket_id)

        query = (" SELECT id, name   "
                 " FROM workflow_workflow "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_rows = cursor.fetchall()

        workflow_result = {}
        if workflow_rows is not None and len(workflow_rows) > 0:
            for row in workflow_rows:
                workflow_result[row[0]] = row[1]

        query = (" SELECT id, name  "
                 " FROM workflow_state "
                 " ORDER BY id ")
        cursor.execute(query)
        workflow_state_rows = cursor.fetchall()

        workflow_state_result = {}
        if workflow_state_rows is not None and len(workflow_state_rows) > 0:
            for row in workflow_state_rows:
                workflow_state_result[row[0]] = row[1]

        query = (" SELECT id, title, workflow_id, sn, state_id, creator, gmt_created, gmt_modified "
                 " FROM ticket_ticketrecord "
                 " ORDER BY id DESC ")
        cursor.execute(query, )
        rows = cursor.fetchall()
        cursor.close()
        cnx.close()

        result = list()
        if rows is not None and len(rows) > 0:
            for row in rows:
                _id = row[0]
                if _id not in ticket_ids:
                    continue
                meta_result = {"id": row[0],
                               "title": row[1],
                               "ticket_type": workflow_result.get(row[2]),
                               "sn": row[3],
                               "state": workflow_state_result.get(row[4]),
                               "creator": row[5],
                               "gmt_created": str(row[6]),
                               "gmt_modified": str(row[7])
                               }
                result.append(meta_result)

        resp.text = json.dumps(result)


class TicketStatusItem:
    @staticmethod
    def __init__():
        """"Initializes ContactCollection"""
        pass

    @staticmethod
    def on_options(req, resp, id_):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_get(req, resp, id_):
        if not id_.isdigit() or int(id_) <= 0:
            raise falcon.HTTPError(falcon.HTTP_400, '400 Bad Request')

        ticket_id = int(id_)
        session = login()
        url = BASE_API + "/api/v1.0/tickets/"+id_+"/flowsteps"
        headers = {
            'Content-Type': 'application/json',
        }
        get_resp = session.get(url, headers=headers)
        content = json.loads(get_resp.text)
        print("content", content)
        resp.text = json.dumps(content)

    @staticmethod
    def on_post(req, resp, id_):
        """Handles POST requests"""
        try:
            raw_json = req.stream.read().decode('utf-8')
        except Exception as ex:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR', description=ex)
        """
        {
        "title": "测试维修",
        "long_field": "测试维修",
        "transition_id": 29,
        "workflow_id": 4
        }"""
        print("id_", id_)
        new_values = json.loads(raw_json)

        checked_fields = [
            {
                "name": "transition_id",
                "type": int
            },
            {
                "name": "workflow_id",
                "type": int
            },

        ]

        for field in checked_fields:
            _name = field['name']
            _type = field['type']
            if _name not in new_values.keys() or \
                    not isinstance(new_values[_name], _type) or \
                    len(str(new_values[_name])) == 0:
                raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                       description='API.INVALID_FIELD' + _name)

        payload = new_values

        session = login()
        url = BASE_API + "/api/v1.0/tickets"
        headers = {
            'Content-Type': 'application/json',
        }
        resp = session.post(url, headers=headers, data=json.dumps(payload))
        content = json.loads(resp.text)
        print("content", content)
        new_ticket_id = content.get('ticket_id')
        print(resp.status_code)
        if resp.status_code != 200:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_COOKIE',
                                   description='API.INVALID_STATUS_CODE:' + str(resp.status_code))
        resp.status = falcon.HTTP_201
        resp.location = '/tickets/' + str(new_ticket_id)


class ContactItem:
    @staticmethod
    def __init__():
        """"Initializes ContactItem"""
        pass

    @staticmethod
    def on_options(req, resp, id_):
        resp.status = falcon.HTTP_200

    @staticmethod
    def on_get(req, resp, id_):
        if not id_.isdigit() or int(id_) <= 0:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.INVALID_CONTACT_ID')

        cnx = mysql.connector.connect(**config.myems_system_db)
        cursor = cnx.cursor()

        query = (" SELECT id, name, uuid, email, phone, description "
                 " FROM tbl_contacts "
                 " WHERE id = %s ")
        cursor.execute(query, (id_,))
        row = cursor.fetchone()
        cursor.close()
        cnx.close()

        if row is None:
            raise falcon.HTTPError(falcon.HTTP_404, title='API.NOT_FOUND',
                                   description='API.CONTACT_NOT_FOUND')

        result = {"id": row[0],
                  "name": row[1],
                  "uuid": row[2],
                  "email": row[3],
                  "phone": row[4],
                  "description": row[5]}
        resp.text = json.dumps(result)

    @staticmethod
    @user_logger
    def on_delete(req, resp, id_):
        access_control(req)
        if not id_.isdigit() or int(id_) <= 0:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.INVALID_CONTACT_ID')

        cnx = mysql.connector.connect(**config.myems_system_db)
        cursor = cnx.cursor()

        cursor.execute(" SELECT name "
                       " FROM tbl_contacts "
                       " WHERE id = %s ", (id_,))
        if cursor.fetchone() is None:
            cursor.close()
            cnx.close()
            raise falcon.HTTPError(falcon.HTTP_404, title='API.NOT_FOUND',
                                   description='API.CONTACT_NOT_FOUND')

        # check relation with shopfloors
        cursor.execute(" SELECT id "
                       " FROM tbl_shopfloors "
                       " WHERE contact_id = %s ", (id_,))
        rows_shopfloors = cursor.fetchall()
        if rows_shopfloors is not None and len(rows_shopfloors) > 0:
            cursor.close()
            cnx.close()
            raise falcon.HTTPError(falcon.HTTP_400,
                                   title='API.BAD_REQUEST',
                                   description='API.THERE_IS_RELATION_WITH_SHOPFLOORS')

        # check relation with spaces
        cursor.execute(" SELECT id "
                       " FROM tbl_spaces "
                       " WHERE contact_id = %s ", (id_,))
        rows_spaces = cursor.fetchall()
        if rows_spaces is not None and len(rows_spaces) > 0:
            cursor.close()
            cnx.close()
            raise falcon.HTTPError(falcon.HTTP_400,
                                   title='API.BAD_REQUEST',
                                   description='API.THERE_IS_RELATION_WITH_SPACES')

        # check relation with stores
        cursor.execute(" SELECT id "
                       " FROM tbl_stores "
                       " WHERE contact_id = %s ", (id_,))
        rows_stores = cursor.fetchall()
        if rows_stores is not None and len(rows_stores) > 0:
            cursor.close()
            cnx.close()
            raise falcon.HTTPError(falcon.HTTP_400,
                                   title='API.BAD_REQUEST',
                                   description='API.THERE_IS_RELATION_WITH_STORES')

        # check relation with tenants
        cursor.execute(" SELECT id "
                       " FROM tbl_tenants "
                       " WHERE contact_id = %s ", (id_,))
        rows_tenants = cursor.fetchall()
        if rows_tenants is not None and len(rows_tenants) > 0:
            cursor.close()
            cnx.close()
            raise falcon.HTTPError(falcon.HTTP_400,
                                   title='API.BAD_REQUEST',
                                   description='API.THERE_IS_RELATION_WITH_TENANTS')

        cursor.execute(" DELETE FROM tbl_contacts WHERE id = %s ", (id_,))
        cnx.commit()

        cursor.close()
        cnx.close()

        resp.status = falcon.HTTP_204

    @staticmethod
    @user_logger
    def on_put(req, resp, id_):
        """Handles PUT requests"""
        access_control(req)
        try:
            raw_json = req.stream.read().decode('utf-8')
        except Exception as ex:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.EXCEPTION', description=ex)

        if not id_.isdigit() or int(id_) <= 0:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.INVALID_CONTACT_ID')

        new_values = json.loads(raw_json)

        if 'name' not in new_values['data'].keys() or \
                not isinstance(new_values['data']['name'], str) or \
                len(str.strip(new_values['data']['name'])) == 0:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.INVALID_CONTACT_NAME')
        name = str.strip(new_values['data']['name'])

        if 'email' not in new_values['data'].keys() or \
                not isinstance(new_values['data']['email'], str) or \
                len(str.strip(new_values['data']['email'])) == 0:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.INVALID_EMAIL')
        email = str.lower(str.strip(new_values['data']['email']))

        match = re.match(r'^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$', email)
        if match is None:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.INVALID_EMAIL')

        if 'phone' not in new_values['data'].keys() or \
                not isinstance(new_values['data']['phone'], str) or \
                len(str.strip(new_values['data']['phone'])) == 0:
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.INVALID_USER_PHONE')
        phone = str.strip(new_values['data']['phone'])

        if 'description' in new_values['data'].keys() and \
                new_values['data']['description'] is not None and \
                len(str(new_values['data']['description'])) > 0:
            description = str.strip(new_values['data']['description'])
        else:
            description = None

        cnx = mysql.connector.connect(**config.myems_system_db)
        cursor = cnx.cursor()

        cursor.execute(" SELECT name "
                       " FROM tbl_contacts "
                       " WHERE id = %s ", (id_,))
        if cursor.fetchone() is None:
            cursor.close()
            cnx.close()
            raise falcon.HTTPError(falcon.HTTP_404, title='API.NOT_FOUND',
                                   description='API.CONTACT_NOT_FOUND')

        cursor.execute(" SELECT name "
                       " FROM tbl_contacts "
                       " WHERE name = %s AND id != %s ", (name, id_))
        if cursor.fetchone() is not None:
            cursor.close()
            cnx.close()
            raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
                                   description='API.CONTACT_NAME_IS_ALREADY_IN_USE')

        update_row = (" UPDATE tbl_contacts "
                      " SET name = %s, email = %s, "
                      "     phone = %s, description = %s "
                      " WHERE id = %s ")
        cursor.execute(update_row, (name,
                                    email,
                                    phone,
                                    description,
                                    id_,))
        cnx.commit()

        cursor.close()
        cnx.close()

        resp.status = falcon.HTTP_200