/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 by Björn Stenberg
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "lcd.h"
#include "button.h"
#include "kernel.h"
#include "version.h"
#include "debug_menu.h"
#include "sprintf.h"
#include <string.h>
#include "font.h"
#include "screens.h"

#define KEYBOARD_LINES 4
#define KEYBOARD_PAGES 3

static void kbd_setupkeys(char* line[KEYBOARD_LINES], int page)
{
    switch (page) {
    case 0:
        line[0] = "ABCDEFG !?\" @#$%+'";
        line[1] = "HIJKLMN 789 &_()-`";
        line[2] = "OPQRSTU 456 §|{}/<";
        line[3] = "VWXYZ.,0123 ~=[]*>";
        break;

    case 1:
        line[0] = "abcdefg ¢£¤¥¦§©®¬";
        line[1] = "hijklmn «»°ºª¹²³¶";
        line[2] = "opqrstu ¯±×÷¡¿µ·¨";
        line[3] = "vwxyz., ¼½¾      ";
        break;

    case 2:
        line[0] = "ÀÁÂÃÄÅÆ ÌÍÎÏ ÈÉÊË";
        line[1] = "àáâãäåæ ìíîï èéêë";
        line[2] = "ÓÒÔÕÖØ ÇÐÞÝß ÙÚÛÜ";
        line[3] = "òóôõöø çðþýÿ ùúûü";
        break;
    }
}

static void kbd_draw_statusbar_button(int num, char* caption, int y, int fw)
{
    int x, x2, tw, cx;
    x = num*(LCD_WIDTH/3);
    x2 = (num+1)*(LCD_WIDTH/3);
    tw = fw * strlen(caption);
    cx = x2 - x;
    /* center the text */
    lcd_putsxy((x + (cx/2)) - (tw/2), y, caption);
    lcd_invertrect(x, y - 1, (x2-x)-1, LCD_HEIGHT-y+1);
}

int kbd_input(char* text, int buflen)
{
    bool done = false;
    int page = 0;

    int font_w = 0, font_h = 0, i;
    int x = 0, y = 0;
    int main_x, main_y, max_chars, margin;
    int status_y1, status_y2, curpos;
    int len;
    int editpos;
    char* line[KEYBOARD_LINES];

    char outline[256];
    char c = 0;
    struct font* font = font_get(FONT_SYSFIXED);

    lcd_setfont(FONT_SYSFIXED);
    font_w = font->maxwidth;
    font_h = font->height;

    margin = 3;
    main_y = (KEYBOARD_LINES + 1) * font_h + margin;
    main_x = 0;
    status_y1 = LCD_HEIGHT - font_h;
    status_y2 = LCD_HEIGHT;

    editpos = strlen(text);

    max_chars = LCD_WIDTH / font_w;
    kbd_setupkeys(line, page);

    while(!done)
    {
        lcd_clear_display();

        /* draw page */
        for (i=0; i < KEYBOARD_LINES; i++)
            lcd_putsxy(0, i * font_h, line[i]);

        len = strlen(text);

        /* separator */
        lcd_drawline(0, main_y - margin, LCD_WIDTH, main_y - margin);

        /* write out the text */
        if (editpos < max_chars - 3 )
        {
            strncpy(outline, text, max_chars - 2);
            if (len > max_chars - 2)
                lcd_putsxy(LCD_WIDTH - font_w, main_y, ">");
            curpos = (1 + editpos) * font_w;
        }
        else
        {
            /* not room for all text, cut left, right or both */
            if (editpos == len )
            {
                if ( max_chars - 3 == len)
                {
                    strncpy(outline, text, max_chars - 2);
                    curpos  = (1 + editpos) * font_w;
                }
                else
                {
                    strncpy(outline, text + editpos - max_chars + 2,
                            max_chars - 2);
                    if (len > max_chars - 2)
                        lcd_putsxy(0, main_y, "<");
                    curpos = ( max_chars - 1) * font_w;
                }
            }
            else
            {
                if (len - 1 == editpos)
                {
                    strncpy(outline, text + editpos - max_chars + 3,
                            max_chars - 2);
                    curpos = ( max_chars - 2) * font_w;
                }
                else
                {
                    strncpy(outline, text + editpos - max_chars + 4,
                            max_chars - 2);
                    curpos = ( max_chars - 3) * font_w;
                }
                lcd_putsxy(LCD_WIDTH - font_w, main_y, ">");
                lcd_putsxy(0, main_y, "<");
            }
        }

        /* Zero terminate the string */
        outline[max_chars - 2] = '\0';
        
        lcd_putsxy(font_w,main_y,outline);

        /* cursor */
        lcd_drawline(curpos, main_y, curpos, main_y + font_h);

        /* draw the status bar */
        kbd_draw_statusbar_button(0, "Shift", status_y1, font_w);
        kbd_draw_statusbar_button(1, "OK", status_y1, font_w);
        kbd_draw_statusbar_button(2, "Del", status_y1, font_w);

        /* highlight the key that has focus */
        lcd_invertrect(font_w * x, font_h * y, font_w, font_h);
        lcd_update();

        switch ( button_get(true) ) {

            case BUTTON_OFF:
                /* abort */
                lcd_setfont(FONT_UI);
                return -1;
                break;

            case BUTTON_F1:
                /* Page */
                if (++page == KEYBOARD_PAGES)
                    page = 0;
                kbd_setupkeys(line, page);
                break;

            case BUTTON_RIGHT:
            case BUTTON_RIGHT | BUTTON_REPEAT:
                if (x < (int)strlen(line[y]) - 1)
                    x++;
                else
                    x = 0;
                break;

            case BUTTON_LEFT:
            case BUTTON_LEFT | BUTTON_REPEAT:
                if (x)
                    x--;
                else
                    x = strlen(line[y]) - 1;
                break;

            case BUTTON_DOWN:
            case BUTTON_DOWN | BUTTON_REPEAT:
                if (y < KEYBOARD_LINES - 1)
                    y++;
                else
                    y=0;
                break;

            case BUTTON_UP:
            case BUTTON_UP | BUTTON_REPEAT:
                if (y)
                    y--;
                else
                    y = KEYBOARD_LINES - 1;
                break;

            case BUTTON_F3:
            case BUTTON_F3 | BUTTON_REPEAT:
                /* backspace */
                if (editpos > 0)
                {
                    for (i = editpos; i <= (len - 1);i++)
                    {
                        text[i-1] = text[i];
                    }
                    text[i-1]='\0';
                    editpos--;
                    if (editpos < 0)
                        editpos=0;
                }
                break;

            case BUTTON_F2:
                /* F2 accepts what was entered and continues */
                done = true;
                break;

            case BUTTON_PLAY:
                /* PLAY inserts the selected char */
                if (len<buflen)
                {
                    c = line[y][x];
                    if ( editpos == len )
                    {
                        text[len] = c;
                        text[len+1] = 0;
                    }
                    else
                    {
                        for (i = len ; i + 1 > editpos; i--)
                            text[i+1] = text[i];
                        text[editpos] = c;
                    }
                    editpos++;
                }
                break;

            case BUTTON_ON | BUTTON_RIGHT:
            case BUTTON_ON | BUTTON_RIGHT | BUTTON_REPEAT:
                /* moved cursor right */
                editpos++;
                if (editpos > len)
                    editpos = len;
                break;

            case BUTTON_ON | BUTTON_LEFT:
            case BUTTON_ON | BUTTON_LEFT | BUTTON_REPEAT:
                /* moved cursor left */
                editpos--;
                if (editpos < 0)
                    editpos = 0;
                break;

            case SYS_USB_CONNECTED:
                usb_screen();
                lcd_setfont(FONT_SYSFIXED);
                break;
        }
    }
    lcd_setfont(FONT_UI);
    return 0;
}