/* Windows TermIO
 *
 * copyright (C) 2003 Sascha Sommer
 *
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

// See  http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/UserInput/VirtualKeyCodes.asp
// for additional virtual keycodes


#include "config.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <windows.h>
#include <io.h>
#include "input/keycodes.h"
#include "input/input.h"
#include "terminal.h"
#include "osdep/w32_keyboard.h"

int screen_width = 79;
int screen_height = 24;
char *terminal_erase_to_end_of_line = "";
char *terminal_cursor_up = "";

#define hSTDOUT GetStdHandle(STD_OUTPUT_HANDLE)
#define hSTDERR GetStdHandle(STD_ERROR_HANDLE)
static short stdoutAttrs = 0;
static const unsigned char ansi2win32[8] = {
    0,
    FOREGROUND_RED,
    FOREGROUND_GREEN,
    FOREGROUND_GREEN | FOREGROUND_RED,
    FOREGROUND_BLUE,
    FOREGROUND_BLUE  | FOREGROUND_RED,
    FOREGROUND_BLUE  | FOREGROUND_GREEN,
    FOREGROUND_BLUE  | FOREGROUND_GREEN | FOREGROUND_RED,
};

void get_screen_size(void)
{
    CONSOLE_SCREEN_BUFFER_INFO cinfo;
    if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &cinfo)) {
        screen_width = cinfo.dwMaximumWindowSize.X;
        screen_height = cinfo.dwMaximumWindowSize.Y;
    }
}

static HANDLE in;
static int getch2_status = 0;

static int getch2_internal(void)
{
    INPUT_RECORD eventbuffer[128];
    DWORD retval;
    int i = 0;
    if (!getch2_status) {
        // supports e.g. MinGW xterm, unfortunately keys are only received after
        // enter was pressed.
        uint8_t c;
        if (!PeekNamedPipe(in, NULL, 1, &retval, NULL, NULL) || !retval)
            return -1;
        ReadFile(in, &c, 1, &retval, NULL);
        return retval == 1 ? c : -1;
    }
    /*check if there are input events*/
    if (!GetNumberOfConsoleInputEvents(in, &retval)) {
        printf("getch2: can't get number of input events: %i\n",
               (int)GetLastError());
        return -1;
    }
    if (retval <= 0)
        return -1;

    /*read all events*/
    if (!ReadConsoleInput(in, eventbuffer, 128, &retval)) {
        printf("getch: can't read input events\n");
        return -1;
    }

    /*filter out keyevents*/
    for (i = 0; i < retval; i++) {
        switch (eventbuffer[i].EventType) {
        case KEY_EVENT: {
            KEY_EVENT_RECORD *record = &eventbuffer[i].Event.KeyEvent;

            /*only a pressed key is interresting for us*/
            if (record->bKeyDown) {
                UINT vkey = record->wVirtualKeyCode;
                bool ext = record->dwControlKeyState & ENHANCED_KEY;

                int mpkey = mp_w32_vkey_to_mpkey(vkey, ext);
                if (mpkey)
                    return mpkey;

                /*only characters should be remaining*/
                //printf("getch2: YOU PRESSED \"%c\" \n",eventbuffer[i].Event.KeyEvent.uChar.AsciiChar);
                return eventbuffer[i].Event.KeyEvent.uChar.UnicodeChar;
            }
            break;
        }
        case MOUSE_EVENT:
        case WINDOW_BUFFER_SIZE_EVENT:
        case FOCUS_EVENT:
        case MENU_EVENT:
        default:
            //printf("getch2: unsupported event type");
            break;
        }
    }
    return -1;
}

static bool getch2(struct input_ctx *ctx)
{
    int r = getch2_internal();
    if (r >= 0)
        mp_input_put_key(ctx, r);
    return true;
}

static int read_keys(void *ctx, int fd)
{
    if (getch2(ctx))
        return MP_INPUT_NOTHING;
    return MP_INPUT_DEAD;
}

void terminal_setup_getch(struct input_ctx *ictx)
{
    mp_input_add_fd(ictx, 0, 1, NULL, read_keys, NULL, ictx);
    getch2_enable();
}

void getch2_poll(void)
{
}

void getch2_enable(void)
{
    DWORD retval;
    in = GetStdHandle(STD_INPUT_HANDLE);
    if (!GetNumberOfConsoleInputEvents(in, &retval)) {
        printf("getch2: %i can't get number of input events  "
               "[disabling console input]\n", (int)GetLastError());
        getch2_status = 0;
    } else
        getch2_status = 1;
}

void getch2_disable(void)
{
    if (!getch2_status)
        return;                // already disabled / never enabled
    getch2_status = 0;
}

bool terminal_in_background(void)
{
    return false;
}

void terminal_set_foreground_color(FILE *stream, int c)
{
    HANDLE *wstream = stream == stderr ? hSTDERR : hSTDOUT;
    if (c < 0 || c >= 8) { // reset or invalid
        SetConsoleTextAttribute(wstream, stdoutAttrs);
    } else {
        SetConsoleTextAttribute(wstream, ansi2win32[c] | FOREGROUND_INTENSITY);
    }
}

int terminal_init(void)
{
    if (AttachConsole(ATTACH_PARENT_PROCESS)) {
        // We have been started by something with a console window.
        // Redirect output streams to that console's low-level handles,
        // so we can actually use WriteConsole later on.

        int hConHandle;

        hConHandle = _open_osfhandle((intptr_t)hSTDOUT, _O_TEXT);
        *stdout = *_fdopen(hConHandle, "w");
        setvbuf(stdout, NULL, _IONBF, 0);

        hConHandle = _open_osfhandle((intptr_t)hSTDERR, _O_TEXT);
        *stderr = *_fdopen(hConHandle, "w");
        setvbuf(stderr, NULL, _IONBF, 0);
    }

    CONSOLE_SCREEN_BUFFER_INFO cinfo;
    DWORD cmode = 0;
    GetConsoleMode(hSTDOUT, &cmode);
    cmode |= (ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);
    SetConsoleMode(hSTDOUT, cmode);
    SetConsoleMode(hSTDERR, cmode);
    GetConsoleScreenBufferInfo(hSTDOUT, &cinfo);
    stdoutAttrs = cinfo.wAttributes;
    return 0;
}