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/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>

 * All rights reserved.

 * Copyright (c) 2008, Jiri Svoboda - All Rights Reserved

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * Redistributions of source code must retain the above copyright notice, this

 * list of conditions and the following disclaimer.

 *

 * 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.

 *

 * Neither the name of the original program's authors 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <io/stream.h>

#include <console.h>

#include <kbd/kbd.h>

#include <kbd/keycode.h>

#include <errno.h>

#include <bool.h>

#include "config.h"

#include "util.h"

#include "scli.h"

#include "input.h"

#include "errors.h"

#include "exec.h"

static void read_line(char *, int);

/* Tokenizes input from console, sees if the first word is a built-in, if so

 * invokes the built-in entry point (a[0]) passing all arguments in a[] to

 * the handler */

int tok_input(cliuser_t *usr)

{

    char *cmd[WORD_MAX];

    int n = 0, i = 0;

    int rc = 0;

    char *tmp;

    if (NULL == usr->line)

        return CL_EFAIL;

    tmp = str_dup(usr->line);

    cmd[n] = strtok(tmp, " ");

    while (cmd[n] && n < WORD_MAX) {

        cmd[++n] = strtok(NULL, " ");

    }

    /* We have rubbish */

    if (NULL == cmd[0]) {

        rc = CL_ENOENT;

        goto finit;

    }

    /* Its a builtin command ? */

    if ((i = (is_builtin(cmd[0]))) > -1) {

        rc = run_builtin(i, cmd, usr);

        goto finit;

    /* Its a module ? */

    } else if ((i = (is_module(cmd[0]))) > -1) {

        rc = run_module(i, cmd);

        goto finit;

    }

    /* See what try_exec thinks of it */

    rc = try_exec(cmd[0], cmd);

finit:

    if (NULL != usr->line) {

        free(usr->line);

        usr->line = (char *) NULL;

    }

    if (NULL != tmp)

        free(tmp);

    return rc;

}

static void read_line(char *buffer, int n)

{

    kbd_event_t ev;

    size_t offs, otmp;

    wchar_t dec;

    offs = 0;

    while (true) {

        fflush(stdout);

        if (kbd_get_event(&ev) < 0)

            return;

        if (ev.type == KE_RELEASE)

            continue;

        if (ev.key == KC_ENTER || ev.key == KC_NENTER)

            break;

        if (ev.key == KC_BACKSPACE) {

            if (offs > 0) {

                /*

                 * Back up until we reach valid start of

                 * character.

                 */

                while (offs > 0) {

                    --offs; otmp = offs;

                    dec = str_decode(buffer, &otmp, n);

                    if (dec != U_SPECIAL)

                        break;

                }

                putchar('\b');

            }

            continue;

        }

        if (ev.c >= ' ') {

            //putchar(ev.c);

            if (chr_encode(ev.c, buffer, &offs, n - 1) == EOK)

                console_putchar(ev.c);

        }

    }

    putchar('\n');

    buffer[offs] = '\0';

}

/* TODO:

 * Implement something like editline() / readline(), if even

 * just for command history and making arrows work. */

void get_input(cliuser_t *usr)

{

    char line[INPUT_MAX];

    console_set_style(STYLE_EMPHASIS);

    printf("%s", usr->prompt);

    console_set_style(STYLE_NORMAL);

    read_line(line, INPUT_MAX);

    /* Make sure we don't have rubbish or a C/R happy user */

    if (str_cmp(line, "") == 0 || str_cmp(line, "\n") == 0)

        return;

    usr->line = str_dup(line);

    return;

}