// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2015 Google, Inc
 * (C) Copyright 2001-2015
 * DENX Software Engineering -- wd@denx.de
 * Compulab Ltd - http://compulab.co.il/
 * Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com
 */

#define LOG_CATEGORY UCLASS_VIDEO_CONSOLE

#include <common.h>
#include <command.h>
#include <console.h>
#include <log.h>
#include <dm.h>
#include <video.h>
#include <video_console.h>
#include <video_font.h>         /* Bitmap font for code page 437 */
#include <linux/ctype.h>

/* By default we scroll by a single line */
#ifndef CONFIG_CONSOLE_SCROLL_LINES
#define CONFIG_CONSOLE_SCROLL_LINES 1
#endif

int vidconsole_putc_xy(struct udevice *dev, uint x, uint y, char ch)
{
        struct vidconsole_ops *ops = vidconsole_get_ops(dev);

        if (!ops->putc_xy)
                return -ENOSYS;
        return ops->putc_xy(dev, x, y, ch);
}

int vidconsole_move_rows(struct udevice *dev, uint rowdst, uint rowsrc,
                         uint count)
{
        struct vidconsole_ops *ops = vidconsole_get_ops(dev);

        if (!ops->move_rows)
                return -ENOSYS;
        return ops->move_rows(dev, rowdst, rowsrc, count);
}

int vidconsole_set_row(struct udevice *dev, uint row, int clr)
{
        struct vidconsole_ops *ops = vidconsole_get_ops(dev);

        if (!ops->set_row)
                return -ENOSYS;
        return ops->set_row(dev, row, clr);
}

static int vidconsole_entry_start(struct udevice *dev)
{
        struct vidconsole_ops *ops = vidconsole_get_ops(dev);

        if (!ops->entry_start)
                return -ENOSYS;
        return ops->entry_start(dev);
}

/* Move backwards one space */
static int vidconsole_back(struct udevice *dev)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
        struct vidconsole_ops *ops = vidconsole_get_ops(dev);
        int ret;

        if (ops->backspace) {
                ret = ops->backspace(dev);
                if (ret != -ENOSYS)
                        return ret;
        }

        priv->xcur_frac -= VID_TO_POS(priv->x_charsize);
        if (priv->xcur_frac < priv->xstart_frac) {
                priv->xcur_frac = (priv->cols - 1) *
                        VID_TO_POS(priv->x_charsize);
                priv->ycur -= priv->y_charsize;
                if (priv->ycur < 0)
                        priv->ycur = 0;
        }
        return video_sync(dev->parent, false);
}

/* Move to a newline, scrolling the display if necessary */
static void vidconsole_newline(struct udevice *dev)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
        struct udevice *vid_dev = dev->parent;
        struct video_priv *vid_priv = dev_get_uclass_priv(vid_dev);
        const int rows = CONFIG_CONSOLE_SCROLL_LINES;
        int i, ret;

        priv->xcur_frac = priv->xstart_frac;
        priv->ycur += priv->y_charsize;

        /* Check if we need to scroll the terminal */
        if ((priv->ycur + priv->y_charsize) / priv->y_charsize > priv->rows) {
                vidconsole_move_rows(dev, 0, rows, priv->rows - rows);
                for (i = 0; i < rows; i++)
                        vidconsole_set_row(dev, priv->rows - i - 1,
                                           vid_priv->colour_bg);
                priv->ycur -= rows * priv->y_charsize;
        }
        priv->last_ch = 0;

        ret = video_sync(dev->parent, false);
        if (ret) {
#ifdef DEBUG
                console_puts_select_stderr(true, "[vc err: video_sync]");
#endif
        }
}

static char *parsenum(char *s, int *num)
{
        char *end;
        *num = simple_strtol(s, &end, 10);
        return end;
}

void vidconsole_set_cursor_pos(struct udevice *dev, int x, int y)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);

        priv->xcur_frac = VID_TO_POS(x);
        priv->xstart_frac = priv->xcur_frac;
        priv->ycur = y;
}

/**
 * set_cursor_position() - set cursor position
 *
 * @priv:       private data of the video console
 * @row:        new row
 * @col:        new column
 */
static void set_cursor_position(struct vidconsole_priv *priv, int row, int col)
{
        /*
         * Ensure we stay in the bounds of the screen.
         */
        if (row >= priv->rows)
                row = priv->rows - 1;
        if (col >= priv->cols)
                col = priv->cols - 1;

        priv->ycur = row * priv->y_charsize;
        priv->xcur_frac = priv->xstart_frac +
                          VID_TO_POS(col * priv->x_charsize);
}

/**
 * get_cursor_position() - get cursor position
 *
 * @priv:       private data of the video console
 * @row:        row
 * @col:        column
 */
static void get_cursor_position(struct vidconsole_priv *priv,
                                int *row, int *col)
{
        *row = priv->ycur / priv->y_charsize;
        *col = VID_TO_PIXEL(priv->xcur_frac - priv->xstart_frac) /
               priv->x_charsize;
}

/*
 * Process a character while accumulating an escape string.  Chars are
 * accumulated into escape_buf until the end of escape sequence is
 * found, at which point the sequence is parsed and processed.
 */
static void vidconsole_escape_char(struct udevice *dev, char ch)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);

        if (!IS_ENABLED(CONFIG_VIDEO_ANSI))
                goto error;

        /* Sanity checking for bogus ESC sequences: */
        if (priv->escape_len >= sizeof(priv->escape_buf))
                goto error;
        if (priv->escape_len == 0) {
                switch (ch) {
                case '7':
                        /* Save cursor position */
                        get_cursor_position(priv, &priv->row_saved,
                                            &priv->col_saved);
                        priv->escape = 0;

                        return;
                case '8': {
                        /* Restore cursor position */
                        int row = priv->row_saved;
                        int col = priv->col_saved;

                        set_cursor_position(priv, row, col);
                        priv->escape = 0;
                        return;
                }
                case '[':
                        break;
                default:
                        goto error;
                }
        }

        priv->escape_buf[priv->escape_len++] = ch;

        /*
         * Escape sequences are terminated by a letter, so keep
         * accumulating until we get one:
         */
        if (!isalpha(ch))
                return;

        /*
         * clear escape mode first, otherwise things will get highly
         * surprising if you hit any debug prints that come back to
         * this console.
         */
        priv->escape = 0;

        switch (ch) {
        case 'A':
        case 'B':
        case 'C':
        case 'D':
        case 'E':
        case 'F': {
                int row, col, num;
                char *s = priv->escape_buf;

                /*
                 * Cursor up/down: [%dA, [%dB, [%dE, [%dF
                 * Cursor left/right: [%dD, [%dC
                 */
                s++;    /* [ */
                s = parsenum(s, &num);
                if (num == 0)                   /* No digit in sequence ... */
                        num = 1;                /* ... means "move by 1". */

                get_cursor_position(priv, &row, &col);
                if (ch == 'A' || ch == 'F')
                        row -= num;
                if (ch == 'C')
                        col += num;
                if (ch == 'D')
                        col -= num;
                if (ch == 'B' || ch == 'E')
                        row += num;
                if (ch == 'E' || ch == 'F')
                        col = 0;
                if (col < 0)
                        col = 0;
                if (row < 0)
                        row = 0;
                /* Right and bottom overflows are handled in the callee. */
                set_cursor_position(priv, row, col);
                break;
        }
        case 'H':
        case 'f': {
                int row, col;
                char *s = priv->escape_buf;

                /*
                 * Set cursor position: [%d;%df or [%d;%dH
                 */
                s++;    /* [ */
                s = parsenum(s, &row);
                s++;    /* ; */
                s = parsenum(s, &col);

                /*
                 * Video origin is [0, 0], terminal origin is [1, 1].
                 */
                if (row)
                        --row;
                if (col)
                        --col;

                set_cursor_position(priv, row, col);

                break;
        }
        case 'J': {
                int mode;

                /*
                 * Clear part/all screen:
                 *   [J or [0J - clear screen from cursor down
                 *   [1J       - clear screen from cursor up
                 *   [2J       - clear entire screen
                 *
                 * TODO we really only handle entire-screen case, others
                 * probably require some additions to video-uclass (and
                 * are not really needed yet by efi_console)
                 */
                parsenum(priv->escape_buf + 1, &mode);

                if (mode == 2) {
                        int ret;

                        video_clear(dev->parent);
                        ret = video_sync(dev->parent, false);
                        if (ret) {
#ifdef DEBUG
                                console_puts_select_stderr(true, "[vc err: video_sync]");
#endif
                        }
                        priv->ycur = 0;
                        priv->xcur_frac = priv->xstart_frac;
                } else {
                        debug("unsupported clear mode: %d\n", mode);
                }
                break;
        }
        case 'K': {
                struct video_priv *vid_priv = dev_get_uclass_priv(dev->parent);
                int mode;

                /*
                 * Clear (parts of) current line
                 *   [0K       - clear line to end
                 *   [2K       - clear entire line
                 */
                parsenum(priv->escape_buf + 1, &mode);

                if (mode == 2) {
                        int row, col;

                        get_cursor_position(priv, &row, &col);
                        vidconsole_set_row(dev, row, vid_priv->colour_bg);
                }
                break;
        }
        case 'm': {
                struct video_priv *vid_priv = dev_get_uclass_priv(dev->parent);
                char *s = priv->escape_buf;
                char *end = &priv->escape_buf[priv->escape_len];

                /*
                 * Set graphics mode: [%d;...;%dm
                 *
                 * Currently only supports the color attributes:
                 *
                 * Foreground Colors:
                 *
                 *   30 Black
                 *   31 Red
                 *   32 Green
                 *   33 Yellow
                 *   34 Blue
                 *   35 Magenta
                 *   36 Cyan
                 *   37 White
                 *
                 * Background Colors:
                 *
                 *   40 Black
                 *   41 Red
                 *   42 Green
                 *   43 Yellow
                 *   44 Blue
                 *   45 Magenta
                 *   46 Cyan
                 *   47 White
                 */

                s++;    /* [ */
                while (s < end) {
                        int val;

                        s = parsenum(s, &val);
                        s++;

                        switch (val) {
                        case 0:
                                /* all attributes off */
                                video_set_default_colors(dev->parent, false);
                                break;
                        case 1:
                                /* bold */
                                vid_priv->fg_col_idx |= 8;
                                vid_priv->colour_fg = video_index_to_colour(
                                                vid_priv, vid_priv->fg_col_idx);
                                break;
                        case 7:
                                /* reverse video */
                                vid_priv->colour_fg = video_index_to_colour(
                                                vid_priv, vid_priv->bg_col_idx);
                                vid_priv->colour_bg = video_index_to_colour(
                                                vid_priv, vid_priv->fg_col_idx);
                                break;
                        case 30 ... 37:
                                /* foreground color */
                                vid_priv->fg_col_idx &= ~7;
                                vid_priv->fg_col_idx |= val - 30;
                                vid_priv->colour_fg = video_index_to_colour(
                                                vid_priv, vid_priv->fg_col_idx);
                                break;
                        case 40 ... 47:
                                /* background color, also mask the bold bit */
                                vid_priv->bg_col_idx &= ~0xf;
                                vid_priv->bg_col_idx |= val - 40;
                                vid_priv->colour_bg = video_index_to_colour(
                                                vid_priv, vid_priv->bg_col_idx);
                                break;
                        default:
                                /* ignore unsupported SGR parameter */
                                break;
                        }
                }

                break;
        }
        default:
                debug("unrecognized escape sequence: %*s\n",
                      priv->escape_len, priv->escape_buf);
        }

        return;

error:
        /* something went wrong, just revert to normal mode: */
        priv->escape = 0;
}

/* Put that actual character on the screen (using the CP437 code page). */
static int vidconsole_output_glyph(struct udevice *dev, char ch)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
        int ret;

        /*
         * Failure of this function normally indicates an unsupported
         * colour depth. Check this and return an error to help with
         * diagnosis.
         */
        ret = vidconsole_putc_xy(dev, priv->xcur_frac, priv->ycur, ch);
        if (ret == -EAGAIN) {
                vidconsole_newline(dev);
                ret = vidconsole_putc_xy(dev, priv->xcur_frac, priv->ycur, ch);
        }
        if (ret < 0)
                return ret;
        priv->xcur_frac += ret;
        priv->last_ch = ch;
        if (priv->xcur_frac >= priv->xsize_frac)
                vidconsole_newline(dev);

        return 0;
}

int vidconsole_put_char(struct udevice *dev, char ch)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
        int ret;

        if (priv->escape) {
                vidconsole_escape_char(dev, ch);
                return 0;
        }

        switch (ch) {
        case '\x1b':
                priv->escape_len = 0;
                priv->escape = 1;
                break;
        case '\a':
                /* beep */
                break;
        case '\r':
                priv->xcur_frac = priv->xstart_frac;
                break;
        case '\n':
                vidconsole_newline(dev);
                vidconsole_entry_start(dev);
                break;
        case '\t':      /* Tab (8 chars alignment) */
                priv->xcur_frac = ((priv->xcur_frac / priv->tab_width_frac)
                                + 1) * priv->tab_width_frac;

                if (priv->xcur_frac >= priv->xsize_frac)
                        vidconsole_newline(dev);
                break;
        case '\b':
                vidconsole_back(dev);
                priv->last_ch = 0;
                break;
        default:
                ret = vidconsole_output_glyph(dev, ch);
                if (ret < 0)
                        return ret;
                break;
        }

        return 0;
}

int vidconsole_put_string(struct udevice *dev, const char *str)
{
        const char *s;
        int ret;

        for (s = str; *s; s++) {
                ret = vidconsole_put_char(dev, *s);
                if (ret)
                        return ret;
        }

        return 0;
}

static void vidconsole_putc(struct stdio_dev *sdev, const char ch)
{
        struct udevice *dev = sdev->priv;
        int ret;

        ret = vidconsole_put_char(dev, ch);
        if (ret) {
#ifdef DEBUG
                console_puts_select_stderr(true, "[vc err: putc]");
#endif
        }
        ret = video_sync(dev->parent, false);
        if (ret) {
#ifdef DEBUG
                console_puts_select_stderr(true, "[vc err: video_sync]");
#endif
        }
}

static void vidconsole_puts(struct stdio_dev *sdev, const char *s)
{
        struct udevice *dev = sdev->priv;
        int ret;

        ret = vidconsole_put_string(dev, s);
        if (ret) {
#ifdef DEBUG
                char str[30];

                snprintf(str, sizeof(str), "[vc err: puts %d]", ret);
                console_puts_select_stderr(true, str);
#endif
        }
        ret = video_sync(dev->parent, false);
        if (ret) {
#ifdef DEBUG
                console_puts_select_stderr(true, "[vc err: video_sync]");
#endif
        }
}

/* Set up the number of rows and colours (rotated drivers override this) */
static int vidconsole_pre_probe(struct udevice *dev)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
        struct udevice *vid = dev->parent;
        struct video_priv *vid_priv = dev_get_uclass_priv(vid);

        priv->xsize_frac = VID_TO_POS(vid_priv->xsize);

        return 0;
}

/* Register the device with stdio */
static int vidconsole_post_probe(struct udevice *dev)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
        struct stdio_dev *sdev = &priv->sdev;

        if (!priv->tab_width_frac)
                priv->tab_width_frac = VID_TO_POS(priv->x_charsize) * 8;

        if (dev_seq(dev)) {
                snprintf(sdev->name, sizeof(sdev->name), "vidconsole%d",
                         dev_seq(dev));
        } else {
                strcpy(sdev->name, "vidconsole");
        }

        sdev->flags = DEV_FLAGS_OUTPUT;
        sdev->putc = vidconsole_putc;
        sdev->puts = vidconsole_puts;
        sdev->priv = dev;

        return stdio_register(sdev);
}

UCLASS_DRIVER(vidconsole) = {
        .id             = UCLASS_VIDEO_CONSOLE,
        .name           = "vidconsole0",
        .pre_probe      = vidconsole_pre_probe,
        .post_probe     = vidconsole_post_probe,
        .per_device_auto        = sizeof(struct vidconsole_priv),
};

#ifdef CONFIG_VIDEO_COPY
int vidconsole_sync_copy(struct udevice *dev, void *from, void *to)
{
        struct udevice *vid = dev_get_parent(dev);

        return video_sync_copy(vid, from, to);
}

int vidconsole_memmove(struct udevice *dev, void *dst, const void *src,
                       int size)
{
        memmove(dst, src, size);
        return vidconsole_sync_copy(dev, dst, dst + size);
}
#endif

void vidconsole_position_cursor(struct udevice *dev, unsigned col, unsigned row)
{
        struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
        struct udevice *vid_dev = dev->parent;
        struct video_priv *vid_priv = dev_get_uclass_priv(vid_dev);
        short x, y;

        x = min_t(short, col * priv->x_charsize, vid_priv->xsize - 1);
        y = min_t(short, row * priv->y_charsize, vid_priv->ysize - 1);
        vidconsole_set_cursor_pos(dev, x, y);
}