// SPDX-License-Identifier: GPL-2.0+
/*
 *  inputbox.c -- implements the input box
 *
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
 */

#include "dialog.h"

char dialog_input_result[MAX_LEN + 1];

/*
 *  Print the termination buttons
 */
static void print_buttons(WINDOW * dialog, int height, int width, int selected)
{
        int x = width / 2 - 11;
        int y = height - 2;

        print_button(dialog, "  Ok  ", y, x, selected == 0);
        print_button(dialog, " Help ", y, x + 14, selected == 1);

        wmove(dialog, y, x + 1 + 14 * selected);
        wrefresh(dialog);
}

/*
 * Display a dialog box for inputing a string
 */
int dialog_inputbox(const char *title, const char *prompt, int height, int width,
                    const char *init)
{
        int i, x, y, box_y, box_x, box_width;
        int input_x = 0, key = 0, button = -1;
        int show_x, len, pos;
        char *instr = dialog_input_result;
        WINDOW *dialog;

        if (!init)
                instr[0] = '\0';
        else {
                strncpy(instr, init, sizeof(dialog_input_result) - 1);
                instr[sizeof(dialog_input_result) - 1] = '\0';
        }

do_resize:
        if (getmaxy(stdscr) <= (height - INPUTBOX_HEIGHT_MIN))
                return -ERRDISPLAYTOOSMALL;
        if (getmaxx(stdscr) <= (width - INPUTBOX_WIDTH_MIN))
                return -ERRDISPLAYTOOSMALL;

        /* center dialog box on screen */
        x = (getmaxx(stdscr) - width) / 2;
        y = (getmaxy(stdscr) - height) / 2;

        draw_shadow(stdscr, y, x, height, width);

        dialog = newwin(height, width, y, x);
        keypad(dialog, TRUE);

        draw_box(dialog, 0, 0, height, width,
                 dlg.dialog.atr, dlg.border.atr);
        wattrset(dialog, dlg.border.atr);
        mvwaddch(dialog, height - 3, 0, ACS_LTEE);
        for (i = 0; i < width - 2; i++)
                waddch(dialog, ACS_HLINE);
        wattrset(dialog, dlg.dialog.atr);
        waddch(dialog, ACS_RTEE);

        print_title(dialog, title, width);

        wattrset(dialog, dlg.dialog.atr);
        print_autowrap(dialog, prompt, width - 2, 1, 3);

        /* Draw the input field box */
        box_width = width - 6;
        getyx(dialog, y, x);
        box_y = y + 2;
        box_x = (width - box_width) / 2;
        draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2,
                 dlg.dialog.atr, dlg.border.atr);

        print_buttons(dialog, height, width, 0);

        /* Set up the initial value */
        wmove(dialog, box_y, box_x);
        wattrset(dialog, dlg.inputbox.atr);

        len = strlen(instr);
        pos = len;

        if (len >= box_width) {
                show_x = len - box_width + 1;
                input_x = box_width - 1;
                for (i = 0; i < box_width - 1; i++)
                        waddch(dialog, instr[show_x + i]);
        } else {
                show_x = 0;
                input_x = len;
                waddstr(dialog, instr);
        }

        wmove(dialog, box_y, box_x + input_x);

        wrefresh(dialog);

        while (key != KEY_ESC) {
                key = wgetch(dialog);

                if (button == -1) {     /* Input box selected */
                        switch (key) {
                        case TAB:
                        case KEY_UP:
                        case KEY_DOWN:
                                break;
                        case KEY_BACKSPACE:
                        case 8:   /* ^H */
                        case 127: /* ^? */
                                if (pos) {
                                        wattrset(dialog, dlg.inputbox.atr);
                                        if (input_x == 0) {
                                                show_x--;
                                        } else
                                                input_x--;

                                        if (pos < len) {
                                                for (i = pos - 1; i < len; i++) {
                                                        instr[i] = instr[i+1];
                                                }
                                        }

                                        pos--;
                                        len--;
                                        instr[len] = '\0';
                                        wmove(dialog, box_y, box_x);
                                        for (i = 0; i < box_width; i++) {
                                                if (!instr[show_x + i]) {
                                                        waddch(dialog, ' ');
                                                        break;
                                                }
                                                waddch(dialog, instr[show_x + i]);
                                        }
                                        wmove(dialog, box_y, input_x + box_x);
                                        wrefresh(dialog);
                                }
                                continue;
                        case KEY_LEFT:
                                if (pos > 0) {
                                        if (input_x > 0) {
                                                wmove(dialog, box_y, --input_x + box_x);
                                        } else if (input_x == 0) {
                                                show_x--;
                                                wmove(dialog, box_y, box_x);
                                                for (i = 0; i < box_width; i++) {
                                                        if (!instr[show_x + i]) {
                                                                waddch(dialog, ' ');
                                                                break;
                                                        }
                                                        waddch(dialog, instr[show_x + i]);
                                                }
                                                wmove(dialog, box_y, box_x);
                                        }
                                        pos--;
                                }
                                continue;
                        case KEY_RIGHT:
                                if (pos < len) {
                                        if (input_x < box_width - 1) {
                                                wmove(dialog, box_y, ++input_x + box_x);
                                        } else if (input_x == box_width - 1) {
                                                show_x++;
                                                wmove(dialog, box_y, box_x);
                                                for (i = 0; i < box_width; i++) {
                                                        if (!instr[show_x + i]) {
                                                                waddch(dialog, ' ');
                                                                break;
                                                        }
                                                        waddch(dialog, instr[show_x + i]);
                                                }
                                                wmove(dialog, box_y, input_x + box_x);
                                        }
                                        pos++;
                                }
                                continue;
                        default:
                                if (key < 0x100 && isprint(key)) {
                                        if (len < MAX_LEN) {
                                                wattrset(dialog, dlg.inputbox.atr);
                                                if (pos < len) {
                                                        for (i = len; i > pos; i--)
                                                                instr[i] = instr[i-1];
                                                        instr[pos] = key;
                                                } else {
                                                        instr[len] = key;
                                                }
                                                pos++;
                                                len++;
                                                instr[len] = '\0';

                                                if (input_x == box_width - 1) {
                                                        show_x++;
                                                } else {
                                                        input_x++;
                                                }

                                                wmove(dialog, box_y, box_x);
                                                for (i = 0; i < box_width; i++) {
                                                        if (!instr[show_x + i]) {
                                                                waddch(dialog, ' ');
                                                                break;
                                                        }
                                                        waddch(dialog, instr[show_x + i]);
                                                }
                                                wmove(dialog, box_y, input_x + box_x);
                                                wrefresh(dialog);
                                        } else
                                                flash();        /* Alarm user about overflow */
                                        continue;
                                }
                        }
                }
                switch (key) {
                case 'O':
                case 'o':
                        delwin(dialog);
                        return 0;
                case 'H':
                case 'h':
                        delwin(dialog);
                        return 1;
                case KEY_UP:
                case KEY_LEFT:
                        switch (button) {
                        case -1:
                                button = 1;     /* Indicates "Help" button is selected */
                                print_buttons(dialog, height, width, 1);
                                break;
                        case 0:
                                button = -1;    /* Indicates input box is selected */
                                print_buttons(dialog, height, width, 0);
                                wmove(dialog, box_y, box_x + input_x);
                                wrefresh(dialog);
                                break;
                        case 1:
                                button = 0;     /* Indicates "OK" button is selected */
                                print_buttons(dialog, height, width, 0);
                                break;
                        }
                        break;
                case TAB:
                case KEY_DOWN:
                case KEY_RIGHT:
                        switch (button) {
                        case -1:
                                button = 0;     /* Indicates "OK" button is selected */
                                print_buttons(dialog, height, width, 0);
                                break;
                        case 0:
                                button = 1;     /* Indicates "Help" button is selected */
                                print_buttons(dialog, height, width, 1);
                                break;
                        case 1:
                                button = -1;    /* Indicates input box is selected */
                                print_buttons(dialog, height, width, 0);
                                wmove(dialog, box_y, box_x + input_x);
                                wrefresh(dialog);
                                break;
                        }
                        break;
                case ' ':
                case '\n':
                        delwin(dialog);
                        return (button == -1 ? 0 : button);
                case 'X':
                case 'x':
                        key = KEY_ESC;
                        break;
                case KEY_ESC:
                        key = on_key_esc(dialog);
                        break;
                case KEY_RESIZE:
                        delwin(dialog);
                        on_key_resize();
                        goto do_resize;
                }
        }

        delwin(dialog);
        return KEY_ESC;         /* ESC pressed */
}