/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2005 Hiroyuki Yamamoto
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include "defs.h"

#include <glib.h>
#include <glib/gi18n.h>
#include <gtk/gtkmain.h>
#include <gtk/gtksignal.h>
#include <gtk/gtkwindow.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>

#include "send_message.h"
#include "session.h"
#include "ssl.h"
#include "smtp.h"
#include "news.h"
#include "prefs_common.h"
#include "prefs_account.h"
#include "procheader.h"
#include "account.h"
#include "progressdialog.h"
#include "statusbar.h"
#include "inputdialog.h"
#include "alertpanel.h"
#include "manage_window.h"
#include "socket.h"
#include "utils.h"

#define SMTP_PORT	25
#if USE_SSL
#define SSMTP_PORT	465
#endif

typedef struct _SendProgressDialog	SendProgressDialog;

struct _SendProgressDialog
{
	ProgressDialog *dialog;
	Session *session;
	gboolean cancelled;
};

static gint send_message_local		(const gchar		*command,
					 FILE			*fp);
static gint send_message_smtp		(PrefsAccount		*ac_prefs,
					 GSList			*to_list,
					 FILE			*fp);

static gint send_recv_message		(Session		*session,
					 const gchar		*msg,
					 gpointer		 data);
static gint send_send_data_progressive	(Session		*session,
					 guint			 cur_len,
					 guint			 total_len,
					 gpointer		 data);
static gint send_send_data_finished	(Session		*session,
					 guint			 len,
					 gpointer		 data);

static SendProgressDialog *send_progress_dialog_create(void);
static void send_progress_dialog_destroy(SendProgressDialog *dialog);

static void send_cancel_button_cb	(GtkWidget	*widget,
					 gpointer	 data);

static void send_put_error		(Session	*session);


gint send_message(const gchar *file, PrefsAccount *ac_prefs, GSList *to_list)
{
	FILE *fp;
	gint val;

	g_return_val_if_fail(file != NULL, -1);
	g_return_val_if_fail(ac_prefs != NULL, -1);
	g_return_val_if_fail(to_list != NULL, -1);

	if ((fp = fopen(file, "rb")) == NULL) {
		FILE_OP_ERROR(file, "fopen");
		return -1;
	}

	if (prefs_common.use_extsend && prefs_common.extsend_cmd) {
		val = send_message_local(prefs_common.extsend_cmd, fp);
		fclose(fp);
		return val;
	}

	val = send_message_smtp(ac_prefs, to_list, fp);

	fclose(fp);
	return val;
}

enum
{
	Q_SENDER     = 0,
	Q_SMTPSERVER = 1,
	Q_RECIPIENTS = 2,
	Q_ACCOUNT_ID = 3
};

QueueInfo *send_get_queue_info(const gchar *file)
{
	static HeaderEntry qentry[] = {{"S:",   NULL, FALSE},
				       {"SSV:", NULL, FALSE},
				       {"R:",   NULL, FALSE},
				       {"AID:", NULL, FALSE},
				       {NULL,   NULL, FALSE}};
	FILE *fp;
	gchar buf[BUFFSIZE];
	gint hnum;
	QueueInfo *qinfo;

	g_return_val_if_fail(file != NULL, NULL);

	if ((fp = fopen(file, "rb")) == NULL) {
		FILE_OP_ERROR(file, "fopen");
		return NULL;
	}

	qinfo = g_new0(QueueInfo, 1);

	while ((hnum = procheader_get_one_field(buf, sizeof(buf), fp, qentry))
	       != -1) {
		gchar *p;

		p = buf + strlen(qentry[hnum].name);

		switch (hnum) {
		case Q_SENDER:
			if (!qinfo->from)
				qinfo->from = g_strdup(p);
			break;
		case Q_SMTPSERVER:
			if (!qinfo->server)
				qinfo->server = g_strdup(p);
			break;
		case Q_RECIPIENTS:
			qinfo->to_list =
				address_list_append(qinfo->to_list, p);
			break;
		case Q_ACCOUNT_ID:
			qinfo->ac = account_find_from_id(atoi(p));
			break;
		default:
			break;
		}
	}

	qinfo->fp = fp;

	if (((!qinfo->ac || (qinfo->ac && qinfo->ac->protocol != A_NNTP)) &&
	     !qinfo->to_list) || !qinfo->from) {
		g_warning(_("Queued message header is broken.\n"));
		send_queue_info_free(qinfo);
		return NULL;
	}

	if (!qinfo->ac) {
		qinfo->ac = account_find_from_smtp_server(qinfo->from,
							  qinfo->server);
		if (!qinfo->ac) {
			g_warning("Account not found. "
				  "Using current account...\n");
			qinfo->ac = cur_account;
		}
	}

	return qinfo;
}

gint send_get_queue_contents(QueueInfo *qinfo, const gchar *dest)
{
	FILE *fp;
	glong pos;
	gchar buf[BUFFSIZE];

	g_return_val_if_fail(qinfo != NULL, -1);
	g_return_val_if_fail(qinfo->fp != NULL, -1);
	g_return_val_if_fail(dest != NULL, -1);

	if ((fp = fopen(dest, "wb")) == NULL) {
		FILE_OP_ERROR(dest, "fopen");
		return -1;
	}

	pos = ftell(qinfo->fp);

	while (fgets(buf, sizeof(buf), qinfo->fp) != NULL)
		fputs(buf, fp);

	if (fclose(fp) < 0) {
		FILE_OP_ERROR(dest, "fclose");
		unlink(dest);
		return -1;
	}

	fseek(qinfo->fp, pos, SEEK_SET);

	return 0;
}

void send_queue_info_free(QueueInfo *qinfo)
{
	if (qinfo == NULL) return;

	slist_free_strings(qinfo->to_list);
	g_slist_free(qinfo->to_list);
	g_free(qinfo->from);
	g_free(qinfo->server);
	if (qinfo->fp)
		fclose(qinfo->fp);
	g_free(qinfo);
}

gint send_message_queue(QueueInfo *qinfo)
{
	gint val = 0;
	glong fpos;
	PrefsAccount *mailac = NULL, *newsac = NULL;

	g_return_val_if_fail(qinfo != NULL, -1);

	fpos = ftell(qinfo->fp);

	if (prefs_common.use_extsend && prefs_common.extsend_cmd) {
		val = send_message_local(prefs_common.extsend_cmd, qinfo->fp);
	} else {
		if (qinfo->ac && qinfo->ac->protocol == A_NNTP) {
			newsac = qinfo->ac;

			/* search mail account */
			mailac = account_find_from_address(qinfo->from);
			if (!mailac) {
				if (cur_account &&
				    cur_account->protocol != A_NNTP)
					mailac = cur_account;
				else {
					mailac = account_get_default();
					if (mailac->protocol == A_NNTP)
						mailac = NULL;
				}
			}
		} else
			mailac = qinfo->ac;

		if (qinfo->to_list) {
			if (mailac)
				val = send_message_smtp(mailac, qinfo->to_list,
							qinfo->fp);
			else {
				PrefsAccount tmp_ac;

				g_warning("Account not found.\n");

				memset(&tmp_ac, 0, sizeof(PrefsAccount));
				tmp_ac.address = qinfo->from;
				tmp_ac.smtp_server = qinfo->server;
				tmp_ac.smtpport = SMTP_PORT;
				val = send_message_smtp(&tmp_ac, qinfo->to_list,
							qinfo->fp);
			}
		}

		if (val == 0 && newsac) {
			fseek(qinfo->fp, fpos, SEEK_SET);
			val = news_post_stream(FOLDER(newsac->folder),
					       qinfo->fp);
			if (val < 0)
				alertpanel_error(_("Error occurred while posting the message to %s ."),
						 newsac->nntp_server);
		}
	}

	fseek(qinfo->fp, fpos, SEEK_SET);

	return val;
}

static gint send_message_local(const gchar *command, FILE *fp)
{
	gchar **argv;
	GPid pid;
	gint child_stdin;
	gchar buf[BUFFSIZE];
	gboolean err = FALSE;
	gint status;

	g_return_val_if_fail(command != NULL, -1);
	g_return_val_if_fail(fp != NULL, -1);

	log_message(_("Sending message using command: %s\n"), command);

	argv = strsplit_with_quote(command, " ", 0);

	if (g_spawn_async_with_pipes(NULL, argv, NULL,
				     G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL,
				     &pid, &child_stdin, NULL, NULL,
				     NULL) == FALSE) {
		g_snprintf(buf, sizeof(buf),
			   _("Can't execute command: %s"), command);
		log_warning("%s\n", buf);
		alertpanel_error("%s", buf);
		g_strfreev(argv);
		return -1;
	}
	g_strfreev(argv);

	while (fgets(buf, sizeof(buf), fp) != NULL) {
		strretchomp(buf);
		if (buf[0] == '.' && buf[1] == '\0') {
			if (fd_write_all(child_stdin, ".", 1) < 0) {
				err = TRUE;
				break;
			}
		}
		if (fd_write_all(child_stdin, buf, strlen(buf)) < 0 ||
		    fd_write_all(child_stdin, "\n", 1) < 0) {
			err = TRUE;
			break;
		}
	}

	fd_close(child_stdin);

	waitpid(pid, &status, 0);
	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
		err = TRUE;

	g_spawn_close_pid(pid);

	if (err) {
		g_snprintf(buf, sizeof(buf),
			   _("Error occurred while executing command: %s"),
			   command);
		log_warning("%s\n", buf);
		alertpanel_error("%s", buf);
		return -1;
	}

	return 0;
}

static gint send_message_smtp(PrefsAccount *ac_prefs, GSList *to_list, FILE *fp)
{
	Session *session;
	SMTPSession *smtp_session;
	gushort port;
	SendProgressDialog *dialog;
	gchar buf[BUFFSIZE];
	gint ret = 0;

	g_return_val_if_fail(ac_prefs != NULL, -1);
	g_return_val_if_fail(ac_prefs->address != NULL, -1);
	g_return_val_if_fail(ac_prefs->smtp_server != NULL, -1);
	g_return_val_if_fail(to_list != NULL, -1);
	g_return_val_if_fail(fp != NULL, -1);

	session = smtp_session_new();
	smtp_session = SMTP_SESSION(session);

	smtp_session->hostname =
		ac_prefs->set_domain ? g_strdup(ac_prefs->domain) : NULL;

	if (ac_prefs->use_smtp_auth) {
		smtp_session->forced_auth_type = ac_prefs->smtp_auth_type;

		if (ac_prefs->smtp_userid) {
			smtp_session->user = g_strdup(ac_prefs->smtp_userid);
			if (ac_prefs->smtp_passwd)
				smtp_session->pass =
					g_strdup(ac_prefs->smtp_passwd);
			else if (ac_prefs->tmp_smtp_pass)
				smtp_session->pass =
					g_strdup(ac_prefs->tmp_smtp_pass);
			else {
				smtp_session->pass =
					input_dialog_query_password
						(ac_prefs->smtp_server,
						 smtp_session->user);
				if (!smtp_session->pass)
					smtp_session->pass = g_strdup("");
				ac_prefs->tmp_smtp_pass =
					g_strdup(smtp_session->pass);
			}
		} else {
			smtp_session->user = g_strdup(ac_prefs->userid);
			if (ac_prefs->passwd)
				smtp_session->pass = g_strdup(ac_prefs->passwd);
			else if (ac_prefs->tmp_pass)
				smtp_session->pass =
					g_strdup(ac_prefs->tmp_pass);
			else {
				smtp_session->pass =
					input_dialog_query_password
						(ac_prefs->smtp_server,
						 smtp_session->user);
				if (!smtp_session->pass)
					smtp_session->pass = g_strdup("");
				ac_prefs->tmp_pass =
					g_strdup(smtp_session->pass);
			}
		}
	} else {
		smtp_session->user = NULL;
		smtp_session->pass = NULL;
	}

	smtp_session->from = g_strdup(ac_prefs->address);
	smtp_session->to_list = to_list;
	smtp_session->cur_to = to_list;
	smtp_session->send_data = get_outgoing_rfc2822_str(fp);
	smtp_session->send_data_len = strlen(smtp_session->send_data);

#if USE_SSL
	port = ac_prefs->set_smtpport ? ac_prefs->smtpport :
		ac_prefs->ssl_smtp == SSL_TUNNEL ? SSMTP_PORT : SMTP_PORT;
	session->ssl_type = ac_prefs->ssl_smtp;
	if (ac_prefs->ssl_smtp != SSL_NONE)
		session->nonblocking = ac_prefs->use_nonblocking_ssl;
#else
	port = ac_prefs->set_smtpport ? ac_prefs->smtpport : SMTP_PORT;
#endif

	dialog = send_progress_dialog_create();
	dialog->session = session;

	progress_dialog_append(dialog->dialog, NULL, ac_prefs->smtp_server,
			       _("Connecting"), NULL);

	g_snprintf(buf, sizeof(buf), _("Connecting to SMTP server: %s ..."),
		   ac_prefs->smtp_server);
	progress_dialog_set_label(dialog->dialog, buf);
	log_message("%s\n", buf);

	session_set_recv_message_notify(session, send_recv_message, dialog);
	session_set_send_data_progressive_notify
		(session, send_send_data_progressive, dialog);
	session_set_send_data_notify(session, send_send_data_finished, dialog);

	if (session_connect(session, ac_prefs->smtp_server, port) < 0) {
		session_destroy(session);
		send_progress_dialog_destroy(dialog);
		return -1;
	}

	debug_print("send_message_smtp(): begin event loop\n");

	while (session_is_connected(session) && dialog->cancelled == FALSE)
		gtk_main_iteration();

	if (SMTP_SESSION(session)->error_val == SM_AUTHFAIL) {
		if (ac_prefs->smtp_userid && ac_prefs->tmp_smtp_pass) {
			g_free(ac_prefs->tmp_smtp_pass);
			ac_prefs->tmp_smtp_pass = NULL;
		}
		ret = -1;
	} else if (session->state == SESSION_EOF &&
		   SMTP_SESSION(session)->state == SMTP_QUIT) {
		/* consider EOF right after QUIT successful */
		log_warning("%s\n", _("Connection closed by the remote host."));
		ret = 0;
	} else if (session->state == SESSION_ERROR ||
		   session->state == SESSION_EOF ||
		   session->state == SESSION_TIMEOUT ||
		   SMTP_SESSION(session)->state == SMTP_ERROR ||
		   SMTP_SESSION(session)->error_val != SM_OK)
		ret = -1;
	else if (dialog->cancelled == TRUE)
		ret = -1;

	if (ret == -1) {
		manage_window_focus_in(dialog->dialog->window, NULL, NULL);
		send_put_error(session);
		manage_window_focus_out(dialog->dialog->window, NULL, NULL);
	}

	session_destroy(session);
	send_progress_dialog_destroy(dialog);

	return ret;
}

static gint send_recv_message(Session *session, const gchar *msg, gpointer data)
{
	gchar buf[BUFFSIZE];
	SMTPSession *smtp_session = SMTP_SESSION(session);
	SendProgressDialog *dialog = (SendProgressDialog *)data;
	gchar *state_str = NULL;

	g_return_val_if_fail(dialog != NULL, -1);

	switch (smtp_session->state) {
	case SMTP_READY:
	case SMTP_CONNECTED:
		return 0;
	case SMTP_HELO:
		g_snprintf(buf, sizeof(buf), _("Sending HELO..."));
		state_str = _("Authenticating");
		statusbar_print_all(_("Sending message..."));
		break;
	case SMTP_EHLO:
		g_snprintf(buf, sizeof(buf), _("Sending EHLO..."));
		state_str = _("Authenticating");
		statusbar_print_all(_("Sending message..."));
		break;
	case SMTP_AUTH:
		g_snprintf(buf, sizeof(buf), _("Authenticating..."));
		state_str = _("Authenticating");
		break;
	case SMTP_FROM:
		g_snprintf(buf, sizeof(buf), _("Sending MAIL FROM..."));
		state_str = _("Sending");
		break;
	case SMTP_RCPT:
		g_snprintf(buf, sizeof(buf), _("Sending RCPT TO..."));
		state_str = _("Sending");
		break;
	case SMTP_DATA:
	case SMTP_EOM:
		g_snprintf(buf, sizeof(buf), _("Sending DATA..."));
		state_str = _("Sending");
		break;
	case SMTP_QUIT:
		g_snprintf(buf, sizeof(buf), _("Quitting..."));
		state_str = _("Quitting");
		break;
	case SMTP_ERROR:
		g_warning("send: error: %s\n", msg);
		return 0;
	default:
		return 0;
	}

	progress_dialog_set_label(dialog->dialog, buf);
	progress_dialog_set_row_status(dialog->dialog, 0, state_str);

	return 0;
}

static gint send_send_data_progressive(Session *session, guint cur_len,
				       guint total_len, gpointer data)
{
	gchar buf[BUFFSIZE];
	SendProgressDialog *dialog = (SendProgressDialog *)data;

	g_return_val_if_fail(dialog != NULL, -1);

	if (SMTP_SESSION(session)->state != SMTP_SEND_DATA &&
	    SMTP_SESSION(session)->state != SMTP_EOM)
		return 0;

	g_snprintf(buf, sizeof(buf), _("Sending message (%d / %d bytes)"),
		   cur_len, total_len);
	progress_dialog_set_label(dialog->dialog, buf);
	progress_dialog_set_percentage
		(dialog->dialog, (gfloat)cur_len / (gfloat)total_len);

	return 0;
}

static gint send_send_data_finished(Session *session, guint len, gpointer data)
{
	SendProgressDialog *dialog = (SendProgressDialog *)data;

	g_return_val_if_fail(dialog != NULL, -1);

	send_send_data_progressive(session, len, len, dialog);
	return 0;
}

static SendProgressDialog *send_progress_dialog_create(void)
{
	SendProgressDialog *dialog;
	ProgressDialog *progress;

	dialog = g_new0(SendProgressDialog, 1);

	progress = progress_dialog_create();
	gtk_window_set_title(GTK_WINDOW(progress->window),
			     _("Sending message"));
	g_signal_connect(G_OBJECT(progress->cancel_btn), "clicked",
			 G_CALLBACK(send_cancel_button_cb), dialog);
	g_signal_connect(G_OBJECT(progress->window), "delete_event",
			 G_CALLBACK(gtk_true), NULL);
	gtk_window_set_modal(GTK_WINDOW(progress->window), TRUE);
	manage_window_set_transient(GTK_WINDOW(progress->window));

	progress_dialog_set_value(progress, 0.0);

	gtk_widget_show_now(progress->window);

	dialog->dialog = progress;

	return dialog;
}

static void send_progress_dialog_destroy(SendProgressDialog *dialog)
{
	g_return_if_fail(dialog != NULL);

	manage_window_destroy(dialog->dialog->window, NULL);
	progress_dialog_destroy(dialog->dialog);
	g_free(dialog);
}

static void send_cancel_button_cb(GtkWidget *widget, gpointer data)
{
	SendProgressDialog *dialog = (SendProgressDialog *)data;

	dialog->cancelled = TRUE;
}

static void send_put_error(Session *session)
{
	gchar *msg;
	gchar *log_msg = NULL;
	gchar *err_msg = NULL;

	msg = SMTP_SESSION(session)->error_msg;

	switch (SMTP_SESSION(session)->error_val) {
	case SM_ERROR:
	case SM_UNRECOVERABLE:
		log_msg = _("Error occurred while sending the message.");
		if (msg)
			err_msg = g_strdup_printf
				(_("Error occurred while sending the message:\n%s"),
				 msg);
		else
			err_msg = g_strdup(log_msg);
		break;
	case SM_AUTHFAIL:
		log_msg = _("Authentication failed.");
		if (msg)
			err_msg = g_strdup_printf
				(_("Authentication failed:\n%s"), msg);
		else
			err_msg = g_strdup(log_msg);
		break;
	default:
		switch (session->state) {
		case SESSION_ERROR:
			log_msg =
				_("Error occurred while sending the message.");
			err_msg = g_strdup(log_msg);
			break;
		case SESSION_EOF:
			log_msg = _("Connection closed by the remote host.");
			err_msg = g_strdup(log_msg);
			break;
		case SESSION_TIMEOUT:
			log_msg = _("Session timed out.");
			err_msg = g_strdup(log_msg);
			break;
		default:
			break;
		}
		break;
	}

	if (log_msg)
		log_warning("%s\n", log_msg);
	if (err_msg) {
		alertpanel_error("%s", err_msg);
		g_free(err_msg);
	}
}