##########################################################################
#
# pgAdmin 4 - PostgreSQL Tools
#
# Copyright (C) 2013 - 2016, The pgAdmin Development Team
# This software is released under the PostgreSQL Licence
#
##########################################################################

"""Utility functions for dealing with AJAX."""

from flask import Response
from flask.ext.babel import gettext as _
import simplejson as json
import datetime
import decimal


class DataTypeJSONEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, datetime.datetime):
            return obj.isoformat()
        if isinstance(obj, decimal.Decimal):
            return float(obj)

        return json.JSONEncoder.default(self, obj)


def make_json_response(success=1, errormsg='', info='', result=None,
                       data=None, status=200):
    """Create a HTML response document describing the results of a request and
    containing the data."""
    doc = dict()
    doc['success'] = success
    doc['errormsg'] = errormsg
    doc['info'] = info
    doc['result'] = result
    doc['data'] = data

    return Response(
            response=json.dumps(doc, cls=DataTypeJSONEncoder),
            status=status,
            mimetype="text/json"
            )


def make_response(response=None, status=200):
    """Create a JSON response handled by the backbone models."""
    return Response(
            response=json.dumps(response, cls=DataTypeJSONEncoder),
            status=status,
            mimetype="text/json"
            )


def internal_server_error(errormsg=''):
    """Create a response with HTTP status code 500 - Internal Server Error."""
    return make_json_response(
            status=500,
            success=0,
            errormsg=errormsg
            )


def forbidden(errmsg=''):
    """Create a response with HTTP status code 403 - Forbidden."""
    return make_json_response(
            status=403,
            success=0,
            errormsg=errmsg
            )


def unauthorized(errormsg=''):
    """Create a response with HTTP status code 401 - Unauthorized."""
    return make_json_response(
            status=401,
            success=0,
            errormsg=errormsg
            )


def bad_request(errormsg=''):
    """Create a response with HTTP status code 400 - Bad Request."""
    return make_json_response(
            status=400,
            success=0,
            errormsg=errormsg
            )


def precondition_required(errormsg=''):
    """Create a response with HTTP status code 428 - Precondition Required."""
    return make_json_response(
            status=428,
            success=0,
            errormsg=errormsg
            )


def success_return(message=''):
    """Create a response with HTTP status code 200 - OK."""
    return make_json_response(
            status=200,
            success=1,
            info=message
            )


def gone(errormsg=''):
    """Create a response with HTTP status code 410 - GONE."""
    return make_json_response(
            status=410,
            success=0,
            errormsg=errormsg
            )


def not_implemented(errormsg=_('It is not implemented!')):
    """Create a response with HTTP status code 501 - Not Implemented."""
    return make_json_response(
            status=501,
            success=0,
            errormsg=errormsg
            )