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/*
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 * QEMU curses/ncurses display driver
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 * 
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 * Copyright (c) 2005 Andrzej Zaborowski  <balrog@zabor.org>
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 * 
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 */
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#include <curses.h>
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#ifndef _WIN32
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#endif
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#ifdef __OpenBSD__
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#define resize_term resizeterm
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#endif
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#include "qemu-common.h"
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#include "console.h"
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#include "sysemu.h"
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#define FONT_HEIGHT 16
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#define FONT_WIDTH 8
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static console_ch_t screen[160 * 100];
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static WINDOW *screenpad = NULL;
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static int width, height, gwidth, gheight, invalidate;
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static int px, py, sminx, sminy, smaxx, smaxy;
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static void curses_update(DisplayState *ds, int x, int y, int w, int h)
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{
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    chtype *line;
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    line = ((chtype *) screen) + y * width;
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    for (h += y; y < h; y ++, line += width)
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        mvwaddchnstr(screenpad, y, 0, line, width);
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    pnoutrefresh(screenpad, py, px, sminy, sminx, smaxy - 1, smaxx - 1);
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    refresh();
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}
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static void curses_calc_pad(void)
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{
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    if (is_fixedsize_console()) {
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        width = gwidth;
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        height = gheight;
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    } else {
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        width = COLS;
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        height = LINES;
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    }
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    if (screenpad)
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        delwin(screenpad);
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    clear();
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    refresh();
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    screenpad = newpad(height, width);
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    if (width > COLS) {
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        px = (width - COLS) / 2;
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        sminx = 0;
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        smaxx = COLS;
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    } else {
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        px = 0;
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        sminx = (COLS - width) / 2;
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        smaxx = sminx + width;
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    }
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    if (height > LINES) {
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        py = (height - LINES) / 2;
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        sminy = 0;
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        smaxy = LINES;
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    } else {
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        py = 0;
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        sminy = (LINES - height) / 2;
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        smaxy = sminy + height;
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    }
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}
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static void curses_resize(DisplayState *ds)
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{
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    if (ds_get_width(ds) == gwidth && ds_get_height(ds) == gheight)
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        return;
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    gwidth = ds_get_width(ds);
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    gheight = ds_get_height(ds);
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    curses_calc_pad();
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    ds->surface->width = width * FONT_WIDTH;
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    ds->surface->height = height * FONT_HEIGHT;
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}
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#ifndef _WIN32
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#if defined(SIGWINCH) && defined(KEY_RESIZE)
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static void curses_winch_handler(int signum)
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{
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    struct winsize {
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        unsigned short ws_row;
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        unsigned short ws_col;
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        unsigned short ws_xpixel;   /* unused */
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        unsigned short ws_ypixel;   /* unused */
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    } ws;
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    /* terminal size changed */
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    if (ioctl(1, TIOCGWINSZ, &ws) == -1)
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        return;
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    resize_term(ws.ws_row, ws.ws_col);
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    curses_calc_pad();
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    invalidate = 1;
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    /* some systems require this */
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    signal(SIGWINCH, curses_winch_handler);
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}
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#endif
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#endif
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static void curses_cursor_position(DisplayState *ds, int x, int y)
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{
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    if (x >= 0) {
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        x = sminx + x - px;
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        y = sminy + y - py;
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        if (x >= 0 && y >= 0 && x < COLS && y < LINES) {
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            move(y, x);
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            curs_set(1);
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            /* it seems that curs_set(1) must always be called before
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             * curs_set(2) for the latter to have effect */
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            if (!is_graphic_console())
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                curs_set(2);
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            return;
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        }
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    }
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    curs_set(0);
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}
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/* generic keyboard conversion */
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#include "curses_keys.h"
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static kbd_layout_t *kbd_layout = NULL;
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static void curses_refresh(DisplayState *ds)
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{
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    int chr, nextchr, keysym, keycode, keycode_alt;
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    if (invalidate) {
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        clear();
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        refresh();
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        curses_calc_pad();
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        ds->surface->width = FONT_WIDTH * width;
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        ds->surface->height = FONT_HEIGHT * height;
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        vga_hw_invalidate();
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        invalidate = 0;
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    }
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    vga_hw_text_update(screen);
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    nextchr = ERR;
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    while (1) {
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        /* while there are any pending key strokes to process */
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        if (nextchr == ERR)
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            chr = getch();
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        else {
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            chr = nextchr;
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            nextchr = ERR;
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        }
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        if (chr == ERR)
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            break;
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#ifdef KEY_RESIZE
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        /* this shouldn't occur when we use a custom SIGWINCH handler */
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        if (chr == KEY_RESIZE) {
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            clear();
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            refresh();
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            curses_calc_pad();
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            curses_update(ds, 0, 0, width, height);
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            ds->surface->width = FONT_WIDTH * width;
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            ds->surface->height = FONT_HEIGHT * height;
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            continue;
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        }
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#endif
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        keycode = curses2keycode[chr];
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        keycode_alt = 0;
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        /* alt key */
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        if (keycode == 1) {
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            nextchr = getch();
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            if (nextchr != ERR) {
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                chr = nextchr;
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                keycode_alt = ALT;
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                keycode = curses2keycode[nextchr];
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                nextchr = ERR;
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                if (keycode != -1) {
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                    keycode |= ALT;
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                    /* process keys reserved for qemu */
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                    if (keycode >= QEMU_KEY_CONSOLE0 &&
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                            keycode < QEMU_KEY_CONSOLE0 + 9) {
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                        erase();
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                        wnoutrefresh(stdscr);
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                        console_select(keycode - QEMU_KEY_CONSOLE0);
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                        invalidate = 1;
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                        continue;
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                    }
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                }
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            }
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        }
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        if (kbd_layout) {
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            keysym = -1;
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            if (chr < CURSES_KEYS)
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                keysym = curses2keysym[chr];
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            if (keysym == -1) {
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                if (chr < ' ') {
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                    keysym = chr + '@';
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                    if (keysym >= 'A' && keysym <= 'Z')
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                        keysym += 'a' - 'A';
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                    keysym |= KEYSYM_CNTRL;
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                } else
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                    keysym = chr;
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            }
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            keycode = keysym2scancode(kbd_layout, keysym & KEYSYM_MASK);
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            if (keycode == 0)
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                continue;
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            keycode |= (keysym & ~KEYSYM_MASK) >> 16;
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            keycode |= keycode_alt;
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        }
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        if (keycode == -1)
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            continue;
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        if (is_graphic_console()) {
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            /* since terminals don't know about key press and release
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             * events, we need to emit both for each key received */
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            if (keycode & SHIFT)
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                kbd_put_keycode(SHIFT_CODE);
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            if (keycode & CNTRL)
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                kbd_put_keycode(CNTRL_CODE);
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            if (keycode & ALT)
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                kbd_put_keycode(ALT_CODE);
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            if (keycode & ALTGR) {
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                kbd_put_keycode(SCANCODE_EMUL0);
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                kbd_put_keycode(ALT_CODE);
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            }
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            if (keycode & GREY)
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                kbd_put_keycode(GREY_CODE);
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            kbd_put_keycode(keycode & KEY_MASK);
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            if (keycode & GREY)
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                kbd_put_keycode(GREY_CODE);
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            kbd_put_keycode((keycode & KEY_MASK) | KEY_RELEASE);
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            if (keycode & ALTGR) {
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                kbd_put_keycode(SCANCODE_EMUL0);
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                kbd_put_keycode(ALT_CODE | KEY_RELEASE);
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            }
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            if (keycode & ALT)
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                kbd_put_keycode(ALT_CODE | KEY_RELEASE);
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            if (keycode & CNTRL)
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                kbd_put_keycode(CNTRL_CODE | KEY_RELEASE);
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            if (keycode & SHIFT)
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                kbd_put_keycode(SHIFT_CODE | KEY_RELEASE);
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        } else {
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            keysym = curses2qemu[chr];
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            if (keysym == -1)
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                keysym = chr;
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            kbd_put_keysym(keysym);
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        }
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    }
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}
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static void curses_atexit(void)
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{
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    endwin();
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}
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static void curses_setup(void)
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{
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    int i, colour_default[8] = {
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        COLOR_BLACK, COLOR_BLUE, COLOR_GREEN, COLOR_CYAN,
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        COLOR_RED, COLOR_MAGENTA, COLOR_YELLOW, COLOR_WHITE,
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    };
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    /* input as raw as possible, let everything be interpreted
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     * by the guest system */
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    initscr(); noecho(); intrflush(stdscr, FALSE);
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    nodelay(stdscr, TRUE); nonl(); keypad(stdscr, TRUE);
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    start_color(); raw(); scrollok(stdscr, FALSE);
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    for (i = 0; i < 64; i ++)
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        init_pair(i, colour_default[i & 7], colour_default[i >> 3]);
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}
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static void curses_keyboard_setup(void)
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{
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#if defined(__APPLE__)
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    /* always use generic keymaps */
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    if (!keyboard_layout)
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        keyboard_layout = "en-us";
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#endif
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    if(keyboard_layout) {
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        kbd_layout = init_keyboard_layout(name2keysym, keyboard_layout);
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        if (!kbd_layout)
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            exit(1);
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    }
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}
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void curses_display_init(DisplayState *ds, int full_screen)
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{
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    DisplayChangeListener *dcl;
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#ifndef _WIN32
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    if (!isatty(1)) {
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        fprintf(stderr, "We need a terminal output\n");
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        exit(1);
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    }
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#endif
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    curses_setup();
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    curses_keyboard_setup();
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    atexit(curses_atexit);
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#ifndef _WIN32
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#if defined(SIGWINCH) && defined(KEY_RESIZE)
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    /* some curses implementations provide a handler, but we
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     * want to be sure this is handled regardless of the library */
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    signal(SIGWINCH, curses_winch_handler);
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#endif
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#endif
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    dcl = (DisplayChangeListener *) qemu_mallocz(sizeof(DisplayChangeListener));
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    dcl->dpy_update = curses_update;
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    dcl->dpy_resize = curses_resize;
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    dcl->dpy_refresh = curses_refresh;
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    dcl->dpy_text_cursor = curses_cursor_position;
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    register_displaychangelistener(ds, dcl);
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    qemu_free_displaysurface(ds);
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    ds->surface = qemu_create_displaysurface_from(640, 400, 0, 0, (uint8_t*) screen);
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    invalidate = 1;
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}