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/*
 * Copyright (C) 2018 "IoT.bzh"
 * Author "Romain Forlot" <romain.forlot@iot.bzh>
 *
 * 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.
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>

#include "influxdb.h"

void influxdb_write_curl_cb(void* closure, int status, CURL* curl, const char* result, size_t size)
{
    AFB_ReqT request = (AFB_ReqT)closure;
    long rep_code = curl_wrap_response_code_get(curl);
    switch (rep_code) {
    case 204:
        AFB_ReqDebug(request, "Request correctly written");
        AFB_ReqSuccess(request, NULL, "Request has been successfully written");
        break;
    case 400:
        AFB_ReqFail(request, "Bad request", result);
        break;
    case 401:
        AFB_ReqFail(request, "Unauthorized access", result);
        break;
    case 404:
        AFB_ReqFail(request, "Not found", result);
        AFB_ReqNotice(request, "Attempt to create the DB '" DEFAULT_DB "'");
        create_database(request);
        break;
    case 500:
        AFB_ReqFailF(request, "Timeout", "Overloaded server: %s", result);
        break;
    default:
        AFB_ReqFail(request, "Failure", "Unexpected behavior.");
        break;
    }
}

static size_t format_write_args(char* query, struct series_t* serie)
{
    char* ts;
    struct list* tags = serie->serie_columns.tags;
    struct list* fields = serie->serie_columns.fields;

    concatenate(query, serie->name, NULL);
    if (tags) {
        while (tags != NULL) {
            concatenate(query, tags->key, ",");
            if (json_object_is_type(tags->value, json_type_string))
                concatenate(query, json_object_get_string(tags->value), "=");
            else
                concatenate(query, json_object_to_json_string(tags->value), "=");
            tags = tags->next;
        }
    }

    if (fields) {
        int i = 0;
        for (struct list* it = fields; it != NULL; it = it->next) {
            if (!i)
                concatenate(query, it->key, " ");
            else
                concatenate(query, it->key, ",");
            if (json_object_is_type(it->value, json_type_string))
                concatenate_str(query, json_object_get_string(it->value), "=");
            else
                concatenate_str(query, json_object_to_json_string(it->value), "=");
            i++;
        }
    }

    asprintf(&ts, "%lu", serie->timestamp);
    concatenate(query, ts, " ");

    return strlen(query);
}

CURL* make_curl_write_post(AFB_ApiT apiHandle, const char* url, json_object* metricsJ)
{
    CURL* curl = NULL;
    size_t lpd = 0, len_write = 0, i = 0;
    char** post_data;
    char write[URL_MAXIMUM_LENGTH] = "";
    struct series_t* serie = NULL;
    json_object* metricsArrayJ = NULL;

    if (json_object_is_type(metricsJ, json_type_array)) {
        lpd = json_object_array_length(metricsJ);
        metricsArrayJ = metricsJ;
    } else {
        metricsArrayJ = json_object_new_array();
        json_object_array_add(metricsArrayJ, metricsJ);
        lpd = 1;
    }

    serie = malloc(sizeof(struct series_t));
    post_data = calloc(lpd + 1, sizeof(void*));

    for (i = 0; i < lpd; i++) {
        memset(serie, 0, sizeof(struct series_t));

        if (unpack_metric_from_api(json_object_array_get_idx(metricsArrayJ, i), serie)) {
            AFB_ApiError(apiHandle, "ERROR unpacking metric. %s", json_object_to_json_string(metricsArrayJ));
            break;
        } else {
            if (!serie->name) {
                post_data[i] = NULL;
            } else {
                // TODO: pass strlen(write) == URL_MAXIMUM_LENGTH to format_write_args and add write size overflow
                len_write = format_write_args(write, serie);
                if (len_write) {
                    post_data[i] = malloc(len_write + 1);
                    strcpy(post_data[i], write);
                    memset(write, 0, len_write);
                }
            }
        }
    }

    AFB_ApiDebug(apiHandle, "influx curl: url=%s data=%s", url, (const char*)*post_data);

    /* Check that we just do not broke the for loop before trying preparing CURL
	   request object */
    curl = i == lpd ? curl_wrap_prepare_post_unescaped(url, NULL, "\n", (const char* const*)post_data) : NULL;
    free(serie);
    for (i = 0; i < lpd; i++)
        free(post_data[i]);
    free(post_data);

    return curl;
}

CURL* influxdb_write(AFB_ApiT apiHandle, const char* host, const char* port, json_object* metricJ)
{
    char url[URL_MAXIMUM_LENGTH]; /* Safe limit for most popular web browser */
    make_url(url, sizeof(url), host, port, "write");
    return make_curl_write_post(apiHandle, url, metricJ);
}

CTLP_CAPI(write_to_influxdb, source, argsJ, eventJ)
{
    AFB_ReqT request = source->request;
    const char* port = NULL;
    const char* host = NULL;
    CURL* curl_request;

    json_object *req_args = AFB_ReqJson(request),
                *portJ = NULL,
                *metric = NULL;

    if (wrap_json_unpack(req_args, "{s?s,s?o,so!}",
            "host", &host,
            "port", &portJ,
            "metric", &metric) || !metric)
        AFB_ReqFail(request, "Failed", "Error processing arguments. Miss metric\
JSON object or malformed");
    else
        port = json_object_is_type(portJ, json_type_null) ? NULL : json_object_to_json_string(portJ);

    curl_request = influxdb_write(source->api, host, port, metric);
    curl_wrap_do(curl_request, influxdb_write_curl_cb, request);

    return 0;
}