/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 <qpid/dispatch/ctools.h>
#include "agent_config_link_route.h"
#include "route_control.h"
#include <stdio.h>

#define QDR_CONFIG_LINK_ROUTE_NAME          0
#define QDR_CONFIG_LINK_ROUTE_IDENTITY      1
#define QDR_CONFIG_LINK_ROUTE_TYPE          2
#define QDR_CONFIG_LINK_ROUTE_PREFIX        3
#define QDR_CONFIG_LINK_ROUTE_DISTRIBUTION  4
#define QDR_CONFIG_LINK_ROUTE_CONNECTION    5
#define QDR_CONFIG_LINK_ROUTE_CONTAINER_ID  6
#define QDR_CONFIG_LINK_ROUTE_DIR           7

const char *qdr_config_link_route_columns[] =
    {"name",
     "identity",
     "type",
     "prefix",
     "distribution",
     "connection",
     "containerId",
     "dir",
     0};


static void qdr_config_link_route_insert_column_CT(qdr_link_route_t *lr, int col, qd_composed_field_t *body, bool as_map)
{
    const char *text = 0;
    const char *key;

    if (as_map)
        qd_compose_insert_string(body, qdr_config_link_route_columns[col]);

    switch(col) {
    case QDR_CONFIG_LINK_ROUTE_NAME:
        if (lr->name)
            qd_compose_insert_string(body, lr->name);
        else
            qd_compose_insert_null(body);
        break;

    case QDR_CONFIG_LINK_ROUTE_IDENTITY: {
        char id_str[100];
        snprintf(id_str, 100, "%ld", lr->identity);
        qd_compose_insert_string(body, id_str);
        break;
    }

    case QDR_CONFIG_LINK_ROUTE_TYPE:
        qd_compose_insert_string(body, "org.apache.qpid.dispatch.config.linkRoute");
        break;

    case QDR_CONFIG_LINK_ROUTE_PREFIX:
        key = (const char*) qd_hash_key_by_handle(lr->addr->hash_handle);
        if (key && (key[0] == 'C' || key[0] == 'D'))
            qd_compose_insert_string(body, &key[1]);
        else
            qd_compose_insert_null(body);
        break;

    case QDR_CONFIG_LINK_ROUTE_DISTRIBUTION:
        switch (lr->treatment) {
        case QD_TREATMENT_LINK_BALANCED: text = "linkBalanced"; break;
        default:
            text = 0;
        }

        if (text)
            qd_compose_insert_string(body, text);
        else
            qd_compose_insert_null(body);

        break;

    case QDR_CONFIG_LINK_ROUTE_CONNECTION:
    case QDR_CONFIG_LINK_ROUTE_CONTAINER_ID:
        if (lr->conn_id) {
            key = (const char*) qd_hash_key_by_handle(lr->conn_id->hash_handle);
            if (key && key[0] == 'L' && col == QDR_CONFIG_LINK_ROUTE_CONNECTION) {
                qd_compose_insert_string(body, &key[1]);
                break;
            }
            if (key && key[0] == 'C' && col == QDR_CONFIG_LINK_ROUTE_CONTAINER_ID) {
                qd_compose_insert_string(body, &key[1]);
                break;
            }
        }
        qd_compose_insert_null(body);
        break;

    case QDR_CONFIG_LINK_ROUTE_DIR:
        text = lr->dir == QD_INCOMING ? "in" : "out";
        qd_compose_insert_string(body, text);
        break;
    }
}


static void qdr_agent_write_config_link_route_CT(qdr_query_t *query,  qdr_link_route_t *lr)
{
    qd_composed_field_t *body = query->body;

    qd_compose_start_list(body);
    int i = 0;
    while (query->columns[i] >= 0) {
        qdr_config_link_route_insert_column_CT(lr, query->columns[i], body, false);
        i++;
    }
    qd_compose_end_list(body);
}


static void qdr_manage_advance_config_link_route_CT(qdr_query_t *query, qdr_link_route_t *lr)
{
    query->next_offset++;
    lr = DEQ_NEXT(lr);
    query->more = !!lr;
}


void qdra_config_link_route_get_first_CT(qdr_core_t *core, qdr_query_t *query, int offset)
{
    //
    // Queries that get this far will always succeed.
    //
    query->status = QD_AMQP_OK;

    //
    // If the offset goes beyond the set of objects, end the query now.
    //
    if (offset >= DEQ_SIZE(core->link_routes)) {
        query->more = false;
        qdr_agent_enqueue_response_CT(core, query);
        return;
    }

    //
    // Run to the object at the offset.
    //
    qdr_link_route_t *lr = DEQ_HEAD(core->link_routes);
    for (int i = 0; i < offset && lr; i++)
        lr = DEQ_NEXT(lr);
    assert(lr);

    //
    // Write the columns of the object into the response body.
    //
    qdr_agent_write_config_link_route_CT(query, lr);

    //
    // Advance to the next link_route
    //
    query->next_offset = offset;
    qdr_manage_advance_config_link_route_CT(query, lr);

    //
    // Enqueue the response.
    //
    qdr_agent_enqueue_response_CT(core, query);
}


void qdra_config_link_route_get_next_CT(qdr_core_t *core, qdr_query_t *query)
{
    qdr_link_route_t *lr = 0;

    if (query->next_offset < DEQ_SIZE(core->link_routes)) {
        lr = DEQ_HEAD(core->link_routes);
        for (int i = 0; i < query->next_offset && lr; i++)
            lr = DEQ_NEXT(lr);
    }

    if (lr) {
        //
        // Write the columns of the addr entity into the response body.
        //
        qdr_agent_write_config_link_route_CT(query, lr);

        //
        // Advance to the next object
        //
        qdr_manage_advance_config_link_route_CT(query, lr);
    } else
        query->more = false;

    //
    // Enqueue the response.
    //
    qdr_agent_enqueue_response_CT(core, query);
}


static const char *qdra_link_route_treatment_CT(qd_parsed_field_t *field, qd_address_treatment_t *trt)
{
    if (field) {
        qd_field_iterator_t *iter = qd_parse_raw(field);
        if (qd_field_iterator_equal(iter, (unsigned char*) "linkBalanced")) {
            *trt = QD_TREATMENT_LINK_BALANCED;
            return 0;
        }
        return "Invalid value for 'distribution'";
    }

    *trt = QD_TREATMENT_LINK_BALANCED;
    return 0;
}


static const char *qdra_link_route_direction_CT(qd_parsed_field_t *field, qd_direction_t *dir)
{
    if (field) {
        qd_field_iterator_t *iter = qd_parse_raw(field);
        if (qd_field_iterator_equal(iter, (unsigned char*) "in")) {
            *dir = QD_INCOMING;
            return 0;
        } else if (qd_field_iterator_equal(iter, (unsigned char*) "out")) {
            *dir = QD_OUTGOING;
            return 0;
        }
        return "Invalid value for 'dir'";
    }
    return "Missing value for 'dir'";
}


static qdr_link_route_t *qdr_link_route_config_find_by_identity_CT(qdr_core_t *core, qd_field_iterator_t *identity)
{
    if (!identity)
        return 0;

    qdr_link_route_t *rc = DEQ_HEAD(core->link_routes);
    while (rc) {
        // Convert the passed in identity to a char*
        char id[100];
        snprintf(id, 100, "%ld", rc->identity);
        if (qd_field_iterator_equal(identity, (const unsigned char*) id))
            break;
        rc = DEQ_NEXT(rc);
    }

    return rc;

}


static qdr_link_route_t *qdr_link_route_config_find_by_name_CT(qdr_core_t *core, qd_field_iterator_t *name)
{
    if (!name)
        return 0;

    qdr_link_route_t *rc = DEQ_HEAD(core->link_routes);
    while (rc) { // Sometimes the name can be null
        if (rc->name && qd_field_iterator_equal(name, (const unsigned char*) rc->name))
            break;
        rc = DEQ_NEXT(rc);
    }

    return rc;
}


void qdra_config_link_route_delete_CT(qdr_core_t          *core,
                                      qdr_query_t         *query,
                                      qd_field_iterator_t *name,
                                      qd_field_iterator_t *identity)
{
    qdr_link_route_t *lr = 0;

    if (!name && !identity)
        query->status = QD_AMQP_BAD_REQUEST;
    else {
        if (identity)
            lr = qdr_link_route_config_find_by_identity_CT(core, identity);
        else if (name)
            lr = qdr_link_route_config_find_by_name_CT(core, name);

        if (lr) {
            qdr_route_del_link_route_CT(core, lr);
            query->status = QD_AMQP_NO_CONTENT;
        } else
            query->status = QD_AMQP_NOT_FOUND;
    }

    //
    // Enqueue the response.
    //
    qdr_agent_enqueue_response_CT(core, query);
}

void qdra_config_link_route_create_CT(qdr_core_t          *core,
                                      qd_field_iterator_t *name,
                                      qdr_query_t         *query,
                                      qd_parsed_field_t   *in_body)
{
    while (true) {
        //
        // Ensure there isn't a duplicate name and that the body is a map
        //
        qdr_link_route_t *lr = DEQ_HEAD(core->link_routes);
        while (lr) {
            if (name && lr->name && qd_field_iterator_equal(name, (const unsigned char*) lr->name))
                break;
            lr = DEQ_NEXT(lr);
        }

        if (!!lr) {
            query->status = QD_AMQP_BAD_REQUEST;
            query->status.description = "Name conflicts with an existing entity";
            break;
        }

        if (!qd_parse_is_map(in_body)) {
            query->status = QD_AMQP_BAD_REQUEST;
            break;
        }

        //
        // Extract the fields from the request
        //
        qd_parsed_field_t *prefix_field     = qd_parse_value_by_key(in_body, qdr_config_link_route_columns[QDR_CONFIG_LINK_ROUTE_PREFIX]);
        qd_parsed_field_t *distrib_field    = qd_parse_value_by_key(in_body, qdr_config_link_route_columns[QDR_CONFIG_LINK_ROUTE_DISTRIBUTION]);
        qd_parsed_field_t *connection_field = qd_parse_value_by_key(in_body, qdr_config_link_route_columns[QDR_CONFIG_LINK_ROUTE_CONNECTION]);
        qd_parsed_field_t *container_field  = qd_parse_value_by_key(in_body, qdr_config_link_route_columns[QDR_CONFIG_LINK_ROUTE_CONTAINER_ID]);
        qd_parsed_field_t *dir_field        = qd_parse_value_by_key(in_body, qdr_config_link_route_columns[QDR_CONFIG_LINK_ROUTE_DIR]);

        //
        // Prefix and dir fields are mandatory.  Fail if they're not both here.
        //
        if (!prefix_field || !dir_field) {
            query->status = QD_AMQP_BAD_REQUEST;
            break;
        }

        qd_direction_t dir;
        const char *error = qdra_link_route_direction_CT(dir_field, &dir);
        if (error) {
            query->status = QD_AMQP_BAD_REQUEST;
            query->status.description = error;
            break;
        }

        qd_address_treatment_t trt;
        error = qdra_link_route_treatment_CT(distrib_field, &trt);
        if (error) {
            query->status = QD_AMQP_BAD_REQUEST;
            query->status.description = error;
            break;
        }

        //
        // The request is good.  Create the entity.
        //
        bool               is_container = !!container_field;
        qd_parsed_field_t *in_use_conn  = is_container ? container_field : connection_field;

        lr = qdr_route_add_link_route_CT(core, name, prefix_field, in_use_conn, is_container, trt, dir);

        //
        // Compose the result map for the response.
        //
        if (query->body) {
            qd_compose_start_map(query->body);
            for (int col = 0; col < QDR_CONFIG_LINK_ROUTE_COLUMN_COUNT; col++)
                qdr_config_link_route_insert_column_CT(lr, col, query->body, true);
            qd_compose_end_map(query->body);
        }

        query->status = QD_AMQP_CREATED;
        break;
    }

    //
    // Enqueue the response if there is a body. If there is no body, this is a management
    // operation created internally by the configuration file parser.
    //
    if (query->body) {
        //
        // If there was an error in processing the create, insert a NULL value into the body.
        //
        if (query->status.status / 100 > 2)
            qd_compose_insert_null(query->body);
        qdr_agent_enqueue_response_CT(core, query);
    } else {
        if (query->status.status / 100 > 2)
            qd_log(core->log, QD_LOG_ERROR, "Error configuring linkRoute: %s", query->status.description);
        qdr_query_free(query);
    }
}