/*
 * libEtPan! -- a mail stuff library
 *
 * Copyright (C) 2001, 2002 - DINH Viet Hoa
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the libEtPan! project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * $Id$
 */

#include "pop3driver_message.h"

#include "mailmessage_tools.h"
#include "pop3driver_tools.h"
#include "pop3driver.h"
#include "mailpop3.h"
#include <stdlib.h>
#include <string.h>

static int pop3_prefetch(mailmessage * msg_info);

static void pop3_prefetch_free(struct generic_message_t * msg);

static int pop3_initialize(mailmessage * msg_info);

static int pop3_fetch_header(mailmessage * msg_info,
			     char ** result,
			     size_t * result_len);

static int pop3_fetch_size(mailmessage * msg_info,
			   size_t * result);

static mailmessage_driver local_pop3_message_driver = {
  .msg_name = "pop3",

  .msg_initialize = pop3_initialize,
  .msg_uninitialize = mailmessage_generic_uninitialize,

  .msg_flush = mailmessage_generic_flush,
  .msg_check = NULL,

  .msg_fetch_result_free = mailmessage_generic_fetch_result_free,

  .msg_fetch = mailmessage_generic_fetch,
  .msg_fetch_header = pop3_fetch_header,
  .msg_fetch_body = mailmessage_generic_fetch_body,
  .msg_fetch_size = pop3_fetch_size,
  .msg_get_bodystructure = mailmessage_generic_get_bodystructure,
  .msg_fetch_section = mailmessage_generic_fetch_section,
  .msg_fetch_section_header = mailmessage_generic_fetch_section_header,
  .msg_fetch_section_mime = mailmessage_generic_fetch_section_mime,
  .msg_fetch_section_body = mailmessage_generic_fetch_section_body,
  .msg_fetch_envelope = mailmessage_generic_fetch_envelope,

  .msg_get_flags = NULL,
};

mailmessage_driver * pop3_message_driver = &local_pop3_message_driver;

static inline struct pop3_session_state_data *
get_data(mailsession * session)
{
  return session->sess_data;
}


static mailpop3 * get_pop3_session(mailsession * session)
{
  return get_data(session)->pop3_session;
}


static int pop3_prefetch(mailmessage * msg_info)
{
  char * msg_content;
  size_t msg_length;
  struct generic_message_t * msg;
  int r;

  r = pop3driver_retr(msg_info->msg_session, msg_info->msg_index,
		      &msg_content, &msg_length);
  if (r != MAIL_NO_ERROR)
    return r;

  msg = msg_info->msg_data;

  msg->msg_message = msg_content;
  msg->msg_length = msg_length;

  return MAIL_NO_ERROR;
}

static void pop3_prefetch_free(struct generic_message_t * msg)
{
  if (msg->msg_message != NULL) {
    mmap_string_unref(msg->msg_message);
    msg->msg_message = NULL;
  }
}

static int pop3_initialize(mailmessage * msg_info)
{
  struct generic_message_t * msg;
  int r;
  char * uid;
  struct mailpop3_msg_info * info;
  mailpop3 * pop3;

  pop3 = get_pop3_session(msg_info->msg_session);
  
  r = mailpop3_get_msg_info(pop3, msg_info->msg_index, &info);
  switch (r) {
  case MAILPOP3_NO_ERROR:
    break;
  default:
    return pop3driver_pop3_error_to_mail_error(r);
  }

  uid = strdup(info->msg_uidl);
  if (uid == NULL)
    return MAIL_ERROR_MEMORY;
  
  r = mailmessage_generic_initialize(msg_info);
  if (r != MAIL_NO_ERROR) {
    free(uid);
    return r;
  }

  msg = msg_info->msg_data;
  msg->msg_prefetch = pop3_prefetch;
  msg->msg_prefetch_free = pop3_prefetch_free;
  msg_info->msg_uid = uid;

  return MAIL_NO_ERROR;
}

     
static int pop3_fetch_header(mailmessage * msg_info,
			     char ** result,
			     size_t * result_len)
{
  struct generic_message_t * msg;
  char * headers;
  size_t headers_length;
  int r;
  
  msg = msg_info->msg_data;

  if (msg->msg_message != NULL)
    return mailmessage_generic_fetch_header(msg_info,
        result, result_len);
  
  r = pop3driver_header(msg_info->msg_session, msg_info->msg_index,
			&headers, &headers_length);
  if (r != MAIL_NO_ERROR)
    return r;
  
  * result = headers;
  * result_len = headers_length;

  return MAIL_NO_ERROR;
}

static int pop3_fetch_size(mailmessage * msg_info,
			   size_t * result)
{
  return pop3driver_size(msg_info->msg_session, msg_info->msg_index, result);
}