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#include <sys/queue.h>

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#include <string.h>

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#include <stdlib.h>

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#include <event2/event_struct.h>

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#include "http.h"

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#include "common.h"

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int http_qarg_parse (struct evhttp_request *request, struct http_qarg *qarg_spec) {

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    // our return code

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    int error = -1;

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    // get the uri from the request

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    const char *uri = evhttp_request_get_uri(request);

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    // the keyval list that we get from evhttp_parse_query

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    struct evkeyval *qarg;

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    struct evkeyvalq qargs;

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    // parse the uri into a list

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    evhttp_parse_query(uri, &qargs);

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    // iterate over the list of given query arugments

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    TAILQ_FOREACH(qarg, &qargs, next) {

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        struct http_qarg *qarg_info;

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        // match them against our http_qarg structs

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        for (qarg_info = qarg_spec; qarg_info->hqa_type != QARG_END; qarg_info++) {

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            if (strcmp(qarg->key, qarg_info->hqa_key) == 0) {

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                // found a match

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                // extract a value from the qarg

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                char *cptr = NULL;

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                signed long int int_val;

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                switch (qarg_info->hqa_type) {

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                    case QARG_UINT :

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                        int_val = strtol(qarg->value, &cptr, 10);

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                        if (*qarg->value == '\0' || *cptr != '\0' || int_val < 0)

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                            ERROR("invalid QARG_UINT: %s: %s -> %ld", qarg->key, qarg->value, int_val);

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                        *((unsigned long int *) qarg_info->hqa_addr) = (unsigned long int) int_val;

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                        break;

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                    case QARG_INVALID :

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                        ERROR("QARG_INVALID: %s: %s", qarg->key, qarg->value);

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                    default :

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                        FATAL("invalid qarg_info->hqa_type: %d", qarg_info->hqa_type);

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                }

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            }

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        }

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    }

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    // success

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    error = 0;

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error:    

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    // clean up the qargs (badly named functions :< )

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    evhttp_clear_headers(&qargs);

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    return error;

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}