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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2025 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <stdio.h>
#include <string.h>
#include "log.h"
#include "learn.h"
#include "message.h"
#include "async_handle.h"
#include "async_wait.h"
#include "async_alarm.h"
#include "timing_types.h"
#include "cmd.h"
#include "cmd_queue.h"
#include "brl.h"
#include "brl_cmds.h"
#include "core.h"
typedef enum {
LMS_CONTINUE,
LMS_TIMEOUT,
LMS_EXIT,
LMS_ERROR
} LearnModeState;
typedef struct {
const char *mode;
LearnModeState state;
struct {
const char *text;
AsyncHandle alarm;
struct {
int initial;
int left;
} seconds;
} prompt;
} LearnModeData;
static int
showText (const char *text, MessageOptions options, LearnModeData *lmd) {
return message(lmd->mode, text, (options | MSG_SYNC));
}
ASYNC_ALARM_CALLBACK(updateLearnModePrompt) {
LearnModeData *lmd = parameters->data;
int *secondsLeft = &lmd->prompt.seconds.left;
{
char prompt[0X100];
snprintf(prompt, sizeof(prompt), "%s - %d", lmd->prompt.text, *secondsLeft);
showText(prompt, (MSG_NODELAY | MSG_SILENT), lmd);
}
*secondsLeft -= 1;
}
static void
endPrompt (LearnModeData *lmd) {
AsyncHandle *alarm = &lmd->prompt.alarm;
if (*alarm) {
asyncCancelRequest(*alarm);
*alarm = NULL;
}
}
static int
beginPrompt (LearnModeData *lmd) {
endPrompt(lmd);
AsyncHandle *alarm = &lmd->prompt.alarm;
lmd->prompt.seconds.left = lmd->prompt.seconds.initial;
if (asyncNewRelativeAlarm(alarm, 0, updateLearnModePrompt, lmd)) {
if (asyncResetAlarmInterval(*alarm, MSECS_PER_SEC)) {
sayMessage(lmd->prompt.text);
return 1;
}
asyncCancelRequest(*alarm);
*alarm = NULL;
}
return 0;
}
static int
handleLearnModeCommands (int command, void *data) {
LearnModeData *lmd = data;
endPrompt(lmd);
logMessage(LOG_DEBUG, "learn: command=%06X", command);
lmd->state = LMS_CONTINUE;
switch (command & BRL_MSK_CMD) {
case BRL_CMD_LEARN:
lmd->state = LMS_EXIT;
return 1;
case BRL_CMD_NOOP:
return 1;
default: {
switch (command & BRL_MSK_BLK) {
case BRL_CMD_BLK(TOUCH_AT):
return 1;
default:
break;
}
break;
}
}
{
char description[0X100];
describeCommand(
description, sizeof(description), command,
(CDO_IncludeName | CDO_IncludeOperand)
);
logMessage(LOG_DEBUG, "learn: %s", description);
if (!showText(description, 0, lmd)) lmd->state = LMS_ERROR;
}
if (!beginPrompt(lmd)) lmd->state = LMS_ERROR;
return 1;
}
ASYNC_CONDITION_TESTER(testEndLearnWait) {
LearnModeData *lmd = data;
return lmd->state != LMS_TIMEOUT;
}
int
learnMode (int timeout) {
LearnModeData lmd = {
.mode = "lrn",
.prompt = {
.text = gettext("Learn Mode"),
.alarm = NULL,
.seconds.initial = timeout / MSECS_PER_SEC,
},
};
pushCommandEnvironment("learnMode", NULL, NULL);
pushCommandHandler("learnMode", KTB_CTX_DEFAULT,
handleLearnModeCommands, NULL, &lmd);
if (setStatusText(&brl, lmd.mode)) {
if (beginPrompt(&lmd)) {
do {
lmd.state = LMS_TIMEOUT;
if (!asyncAwaitCondition(timeout, testEndLearnWait, &lmd)) break;
} while (lmd.state == LMS_CONTINUE);
endPrompt(&lmd);
if (lmd.state == LMS_TIMEOUT) {
if (!showText(gettext("done"), 0, &lmd)) {
lmd.state = LMS_ERROR;
}
}
}
}
popCommandEnvironment();
return lmd.state != LMS_ERROR;
}
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