#include <stdlib.h>
#include <assert.h>

#include "request.h"
#include "memcache.h"
#include "../common.h"

struct memcache_req *memcache_req_alloc (struct memcache *mc, enum memcache_command cmd_type, const struct memcache_key *key, void *cb_arg) {
    struct memcache_req *req = NULL;
    
    // allocate it
    if ((req = calloc(1, sizeof(*req))) == NULL)
        ERROR("calloc");
    
    // state
    req->state = MEMCACHE_STATE_INVALID;

    // copy the key
    if ((req->key.buf = malloc(key->len)) == NULL)
        ERROR("malloc key buf");
    
    // copy over the key
    memcpy(req->key.buf, key->buf, key->len);
    req->key.len = key->len;

    // store the other data
    req->mc = mc;
    req->cmd_type = cmd_type;
    req->cb_arg = cb_arg;

    // success
    return req;

error:
    if (req) {
        free(req->key.buf);
        free(req);
    }

    return NULL;
}

static void _memcache_req_notify (struct memcache_req *req) {
    req->mc->cb_fn(req, req->cb_arg);
}

void memcache_req_error (struct memcache_req *req) {
    // forget our connection
    req->conn = NULL;

    req->state = MEMCACHE_STATE_ERROR;

    _memcache_req_notify(req);
}

void memcache_req_queued (struct memcache_req *req) {
    req->state = MEMCACHE_STATE_QUEUED;

//    _memcache_req_notify(req);
}

void memcache_req_send (struct memcache_req *req) {
    req->state = MEMCACHE_STATE_SEND;
    
//    _memcache_req_notify(req);
}

void memcache_req_reply (struct memcache_req *req, enum memcache_reply reply_type) {
    req->state = MEMCACHE_STATE_REPLY;
    req->reply_type = reply_type;

    _memcache_req_notify(req);
}

void memcache_req_done (struct memcache_req *req) {
    // make sure we are in the STATE_SEND state
    assert(req->state == MEMCACHE_STATE_SEND);

    // forget the connection
    req->conn = NULL;

    // our state is currently indeterminate until req_reply is called
    req->state = MEMCACHE_STATE_INVALID;
}

void memcache_req_free (struct memcache_req *req) {
    // must be unused
    assert(req->conn == NULL);
    assert(req->state == MEMCACHE_STATE_INVALID || req->state == MEMCACHE_STATE_ERROR);

    free(req->key.buf);
    free(req);
}