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/*
 * Copyright (C) 2006 Josef Cejka
 * Copyright (C) 2006 Jakub Vana
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */


#include <io/io.h>
#include <io/stream.h>
#include <string.h>
#include <malloc.h>
#include <libc.h>
#include <ipc/ipc.h>
#include <ipc/ns.h>
#include <ipc/fb.h>
#include <ipc/services.h>
#include <console.h>
#include <unistd.h>
#include <async.h>

#define FDS 32

typedef struct stream_t {
    pwritefn_t w;
    preadfn_t r;
    void * param;
    int phone;
} stream_t;

static int console_phone = -1;
static stream_t streams[FDS];

static ssize_t write_stderr(void *param, const void *buf, size_t count)
{
    return count;
}

static ssize_t read_stdin(void *param, void *buf, size_t count)
{
    ipcarg_t r0,r1;
    size_t i = 0;

    while (i < count) {
        if (async_req_2(streams[0].phone, CONSOLE_GETCHAR, 0, 0, &r0, &r1) < 0) {
            return -1;
        }
        ((char *) buf)[i++] = r0;
    }
    return i;
}

static ssize_t write_stdout(void *param, const void *buf, size_t count)
{
    int i;

    for (i = 0; i < count; i++)
        async_msg(streams[1].phone, CONSOLE_PUTCHAR, ((const char *) buf)[i]);
    
    return count;
}


static stream_t open_stdin(void)
{
    stream_t stream;
    
    if (console_phone < 0) {
        while ((console_phone = ipc_connect_me_to(PHONE_NS, SERVICE_CONSOLE, 0)) < 0) {
            usleep(10000);
        }
    }
    
    stream.r = read_stdin;
    stream.w = NULL;
    stream.param = 0;
    stream.phone = console_phone;
    
    return stream;
}

static stream_t open_stdout(void)
{
    stream_t stream;

    if (console_phone < 0) {
        while ((console_phone = ipc_connect_me_to(PHONE_NS, SERVICE_CONSOLE, 0)) < 0) {
            usleep(10000);
        }
    }
    
    stream.r = NULL;
    stream.w = write_stdout;
    stream.phone = console_phone;
    stream.param = 0;
    
    return stream;
}

static ssize_t write_null(void *param, const void *buf, size_t count)
{
    return count;
}


fd_t open(const char *fname, int flags)
{
    int c = 0;

    while (((streams[c].w) || (streams[c].r)) && (c < FDS))
        c++;
    
    if (c == FDS)
        return EMFILE;
    
    if (!strcmp(fname, "stdin")) {
        streams[c] = open_stdin();
        return c;
    }
    
    if (!strcmp(fname, "stdout")) {
        streams[c] = open_stdout();
        return c;
    }
    
    if (!strcmp(fname, "stderr")) {
        streams[c].w = write_stderr;
        return c;
    }
    
    if (!strcmp(fname, "null")) {
        streams[c].w = write_null;
        return c;
    }
    
    return -1;
}


ssize_t write(int fd, const void *buf, size_t count)
{
//  __SYSCALL3(SYS_IO, 1, (sysarg_t)buf, (sysarg_t) count);
//  return count;
    if (fd < FDS)
        return streams[fd].w(streams[fd].param, buf, count);
    
    return 0;
}

ssize_t read(int fd, void *buf, size_t count)
{
    if (fd < FDS)
        return streams[fd].r(streams[fd].param, buf, count);
    
    return 0;
}

int get_fd_phone(int fd)
{
    if (fd >= FDS || fd < 0)
        return -1;
    return streams[fd].phone;
}


/** @}
 */