// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/kernel.h>
#include <linux/string.h>

#include "../helpline.h"
#include "../ui.h"
#include "../libslang.h"

char ui_helpline__last_msg[1024];
bool tui_helpline__set;

static void tui_helpline__pop(void)
{
}

static void tui_helpline__push(const char *msg)
{
        const size_t sz = sizeof(ui_helpline__current);

        SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
        SLsmg_set_color(0);
        SLsmg_write_nstring(msg, SLtt_Screen_Cols);
        SLsmg_refresh();
        strlcpy(ui_helpline__current, msg, sz);
}

static int tui_helpline__show(const char *format, va_list ap)
{
        int ret;
        static int backlog;

        mutex_lock(&ui__lock);
        ret = vscnprintf(ui_helpline__last_msg + backlog,
                        sizeof(ui_helpline__last_msg) - backlog, format, ap);
        backlog += ret;

        tui_helpline__set = true;

        if (ui_helpline__last_msg[backlog - 1] == '\n') {
                ui_helpline__puts(ui_helpline__last_msg);
                SLsmg_refresh();
                backlog = 0;
        }
        mutex_unlock(&ui__lock);

        return ret;
}

struct ui_helpline tui_helpline_fns = {
        .pop    = tui_helpline__pop,
        .push   = tui_helpline__push,
        .show   = tui_helpline__show,
};

void ui_helpline__init(void)
{
        helpline_fns = &tui_helpline_fns;
        ui_helpline__puts(" ");
}