/*
 * 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
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <linux/ctype.h>
#include <dm.h>
#include <video.h>
#include <video_console.h>
#include <video_font.h>         /* Get font data, width and height */

/* 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;
        }
        video_sync(dev->parent);

        return 0;
}

/* 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;

        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;

        video_sync(dev->parent);
}

static const struct {
        unsigned r;
        unsigned g;
        unsigned b;
} colors[] = {
        { 0x00, 0x00, 0x00 },  /* black */
        { 0xff, 0x00, 0x00 },  /* red */
        { 0x00, 0xff, 0x00 },  /* green */
        { 0xff, 0xff, 0x00 },  /* yellow */
        { 0x00, 0x00, 0xff },  /* blue */
        { 0xff, 0x00, 0xff },  /* magenta */
        { 0x00, 0xff, 0xff },  /* cyan */
        { 0xff, 0xff, 0xff },  /* white */
};

static void set_color(struct video_priv *priv, unsigned idx, unsigned *c)
{
        switch (priv->bpix) {
        case VIDEO_BPP16:
                *c = ((colors[idx].r >> 3) << 0) |
                     ((colors[idx].g >> 2) << 5) |
                     ((colors[idx].b >> 3) << 11);
                break;
        case VIDEO_BPP32:
                *c = 0xff000000 |
                     (colors[idx].r << 0) |
                     (colors[idx].g << 8) |
                     (colors[idx].b << 16);
                break;
        default:
                /* unsupported, leave current color in place */
                break;
        }
}

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

/*
 * 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 && ch != '[')
                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 '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);

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

                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) {
                        video_clear(dev->parent);
                        video_sync(dev->parent);
                        priv->ycur = 0;
                        priv->xcur_frac = priv->xstart_frac;
                } else {
                        debug("unsupported clear mode: %d\n", mode);
                }
                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 30 ... 37:
                                /* fg color */
                                set_color(vid_priv, val - 30,
                                          (unsigned *)&vid_priv->colour_fg);
                                break;
                        case 40 ... 47:
                                /* bg color */
                                set_color(vid_priv, val - 40,
                                          (unsigned *)&vid_priv->colour_bg);
                                break;
                        default:
                                /* unknown/unsupported */
                                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;
}

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:
                /*
                 * 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);
                break;
        }

        return 0;
}

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

        vidconsole_put_char(dev, ch);
        video_sync(dev->parent);
}

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

        while (*s)
                vidconsole_put_char(dev, *s++);
        video_sync(dev->parent);
}

/* 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) {
                snprintf(sdev->name, sizeof(sdev->name), "vidconsole%d",
                         dev->seq);
        } 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_alloc_size     = sizeof(struct vidconsole_priv),
};

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);

        priv->xcur_frac = VID_TO_POS(min_t(short, col, vid_priv->xsize - 1));
        priv->ycur = min_t(short, row, vid_priv->ysize - 1);
}

static int do_video_setcursor(cmd_tbl_t *cmdtp, int flag, int argc,
                              char *const argv[])
{
        unsigned int col, row;
        struct udevice *dev;

        if (argc != 3)
                return CMD_RET_USAGE;

        if (uclass_first_device_err(UCLASS_VIDEO_CONSOLE, &dev))
                return CMD_RET_FAILURE;
        col = simple_strtoul(argv[1], NULL, 10);
        row = simple_strtoul(argv[2], NULL, 10);
        vidconsole_position_cursor(dev, col, row);

        return 0;
}

static int do_video_puts(cmd_tbl_t *cmdtp, int flag, int argc,
                         char *const argv[])
{
        struct udevice *dev;
        const char *s;

        if (argc != 2)
                return CMD_RET_USAGE;

        if (uclass_first_device_err(UCLASS_VIDEO_CONSOLE, &dev))
                return CMD_RET_FAILURE;
        for (s = argv[1]; *s; s++)
                vidconsole_put_char(dev, *s);

        video_sync(dev->parent);

        return 0;
}

U_BOOT_CMD(
        setcurs, 3,     1,      do_video_setcursor,
        "set cursor position within screen",
        "    <col> <row> in character"
);

U_BOOT_CMD(
        lcdputs, 2,     1,      do_video_puts,
        "print string on video framebuffer",
        "    <string>"
);