/*******************************************************************************
 * Copyright 2013-2020 Aerospike, Inc.
 *
 * 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.
 ******************************************************************************/

#include <Python.h>
#include <stdbool.h>

#include <aerospike/aerospike_key.h>
#include <aerospike/as_key.h>
#include <aerospike/as_error.h>
#include <aerospike/as_record.h>

#include "client.h"
#include "conversions.h"
#include "exceptions.h"
#include "policy.h"

/**
 *******************************************************************************************************
 * This function read a record with a given key, and return the record.
 *
 * @param self                  AerospikeClient object
 * @param py_key                The key under which to store the record.
 * @param py_policy             The dictionary of policies to be given while
 *                              reading a record.
 *
 * Returns the record on success.
 * In case of error,appropriate exceptions will be raised.
 *******************************************************************************************************
 */
PyObject *AerospikeClient_Get_Invoke(AerospikeClient *self, PyObject *py_key,
                                     PyObject *py_policy)
{
    // Python Return Value
    PyObject *py_rec = NULL;

    // Aerospike Client Arguments
    as_error err;
    as_policy_read read_policy;
    as_policy_read *read_policy_p = NULL;
    as_key key;
    as_record *rec = NULL;

    // For converting expressions.
    as_exp exp_list;
    as_exp *exp_list_p = NULL;

    // Initialised flags
    bool key_initialised = false;
    bool record_initialised = false;

    // Initialize error
    as_error_init(&err);

    if (!self || !self->as) {
        as_error_update(&err, AEROSPIKE_ERR_PARAM, "Invalid aerospike object");
        goto CLEANUP;
    }

    if (!self->is_conn_16) {
        as_error_update(&err, AEROSPIKE_ERR_CLUSTER,
                        "No connection to aerospike cluster");
        goto CLEANUP;
    }

    // Convert python key object to as_key
    pyobject_to_key(&err, py_key, &key);
    if (err.code != AEROSPIKE_OK) {
        goto CLEANUP;
    }
    // Key is successfully initialised.
    key_initialised = true;

    // Convert python policy object to as_policy_exists
    pyobject_to_policy_read(self, &err, py_policy, &read_policy, &read_policy_p,
                            &self->as->config.policies.read, &exp_list,
                            &exp_list_p);
    if (err.code != AEROSPIKE_OK) {
        goto CLEANUP;
    }

    // Invoke operation
    Py_BEGIN_ALLOW_THREADS
    aerospike_key_get(self->as, &err, read_policy_p, &key, &rec);
    Py_END_ALLOW_THREADS
    if (err.code == AEROSPIKE_OK) {
        record_initialised = true;

        if (record_to_pyobject(self, &err, rec, &key, &py_rec) !=
            AEROSPIKE_OK) {
            goto CLEANUP;
        }
        if (!read_policy_p ||
            (read_policy_p && read_policy_p->key == AS_POLICY_KEY_DIGEST)) {
            // This is a special case.
            // C-client returns NULL key, so to the user
            // response will be (<ns>, <set>, None, <digest>)
            // Using the same input key, just making primary key part to be None
            // Only in case of POLICY_KEY_DIGEST or no policy specified
            PyObject *p_key = PyTuple_GetItem(py_rec, 0);
            Py_INCREF(Py_None);
            PyTuple_SetItem(p_key, 2, Py_None);
        }
    }

CLEANUP:

    if (exp_list_p) {
        as_exp_destroy(exp_list_p);
        ;
    }

    if (key_initialised == true) {
        // Destroy key only if it is initialised.
        as_key_destroy(&key);
    }

    if (rec && record_initialised) {
        // Destroy record only if it is initialised.
        as_record_destroy(rec);
    }

    if (err.code != AEROSPIKE_OK) {
        raise_exception_base(&err, py_key, Py_None, Py_None, Py_None, Py_None);
        return NULL;
    }

    return py_rec;
}

/**
 *******************************************************************************************************
 * Gets a record from the Aerospike DB.
 *
 * @param self                  AerospikeClient object
 * @param args                  The args is a tuple object containing an argument
 *                              list passed from Python to a C function
 * @param kwds                  Dictionary of keywords
 *
 * Returns a tuple of record having key, meata and bins sequentially.
 * In case of error,appropriate exceptions will be raised.
 *******************************************************************************************************
 */
PyObject *AerospikeClient_Get(AerospikeClient *self, PyObject *args,
                              PyObject *kwds)
{
    // Python Function Arguments
    PyObject *py_key = NULL;
    PyObject *py_policy = NULL;

    // Python Function Keyword Arguments
    static char *kwlist[] = {"key", "policy", NULL};

    // Python Function Argument Parsing
    if (PyArg_ParseTupleAndKeywords(args, kwds, "O|O:get", kwlist, &py_key,
                                    &py_policy) == false) {
        return NULL;
    }

    // Invoke Operation
    return AerospikeClient_Get_Invoke(self, py_key, py_policy);
}
