#include "json.h"
#include "common.h"
#include "cmd.h"
#include "http.h"

#include <string.h>
#include <hiredis/hiredis.h>
#include <hiredis/async.h>

static json_t *
json_wrap_redis_reply(const struct cmd *cmd, const redisReply *r);

void
json_reply(redisAsyncContext *c, void *r, void *privdata) {

	redisReply *reply = r;
	struct cmd *cmd = privdata;
	json_t *j;
	char *jstr;
	(void)c;

	if(cmd == NULL) {
		/* broken connection */
		return;
	}

	if (reply == NULL) {
		http_send_reply(cmd->client, 404, "Not Found", NULL, 0);
		return;
	}

	/* encode redis reply as JSON */
	j = json_wrap_redis_reply(cmd, r);

	/* get JSON as string, possibly with JSONP wrapper */
	jstr = json_string_output(j, cmd);

	/* send reply */
	format_send_reply(cmd, jstr, strlen(jstr), "application/json");

	/* cleanup */
	json_decref(j);
	free(jstr);
}

static json_t *
json_wrap_redis_reply(const struct cmd *cmd, const redisReply *r) {

	unsigned int i;
	json_t *jlist, *jroot = json_object(); /* that's what we return */


	/* copy verb, as jansson only takes a char* but not its length. */
	char *verb;
	if(cmd->count) {
		verb = calloc(cmd->argv_len[0]+1, 1);
		memcpy(verb, cmd->argv[0], cmd->argv_len[0]);
	} else {
		verb = strdup("");
	}

	switch(r->type) {
		case REDIS_REPLY_STATUS:
		case REDIS_REPLY_ERROR:
			jlist = json_array();
			json_array_append_new(jlist,
				r->type == REDIS_REPLY_ERROR ? json_false() : json_true());
			json_array_append_new(jlist, json_string(r->str));
			json_object_set_new(jroot, verb, jlist);
			break;

		case REDIS_REPLY_STRING:
			json_object_set_new(jroot, verb, json_string(r->str));
			break;

		case REDIS_REPLY_INTEGER:
			json_object_set_new(jroot, verb, json_integer(r->integer));
			break;

		case REDIS_REPLY_ARRAY:
			jlist = json_array();
			for(i = 0; i < r->elements; ++i) {
				redisReply *e = r->element[i];
				switch(e->type) {
					case REDIS_REPLY_STRING:
						json_array_append_new(jlist, json_string(e->str));
						break;
					case REDIS_REPLY_INTEGER:
						json_array_append_new(jlist, json_integer(e->integer));
						break;
					default:
						json_array_append_new(jlist, json_null());
						break;
				}
			}
			json_object_set_new(jroot, verb, jlist);
			break;

		default:
			json_object_set_new(jroot, verb, json_null());
			break;
	}

	free(verb);
	return jroot;
}


char *
json_string_output(json_t *j, struct cmd *cmd) {
	struct evkeyval *kv;

	char *json_reply = json_dumps(j, JSON_COMPACT);

	/* FIXME: check for JSONP */
#if 0
	TAILQ_FOREACH(kv, &cmd->uri_params, next) {
		if(strcmp(kv->key, "jsonp") == 0) {
			size_t json_len = strlen(json_reply);
			size_t val_len = strlen(kv->value);
			size_t ret_len = val_len + 1 + json_len + 3;
			char *ret = calloc(1 + ret_len, 1);

			memcpy(ret, kv->value, val_len);
			ret[val_len]='(';
			memcpy(ret + val_len + 1, json_reply, json_len);
			memcpy(ret + val_len + 1 + json_len, ");\n", 3);
			free(json_reply);

			return ret;
		}
	}
#endif

	return json_reply;
}