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/*
 * Copyright (c) 2009 Jakub Jermar
 * 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 genarch
 * @{
 */
/**
 * @file
 * @brief Serial line processing.
 */

#include <genarch/srln/srln.h>
#include <console/chardev.h>
#include <console/console.h>
#include <proc/thread.h>
#include <arch.h>
#include <string.h>

static indev_operations_t srln_raw_ops = {
    .poll = NULL
};

static void ksrln(void *arg)
{
    srln_instance_t *instance = (srln_instance_t *) arg;
    bool cr = false;
    uint32_t escape = 0;
    
    while (true) {
        wchar_t ch = indev_pop_character(&instance->raw);
        
        /* ANSI escape sequence processing */
        if (escape != 0) {
            escape <<= 8;
            escape |= ch & 0xff;
            
            if ((escape == 0x1b4f) || (escape == 0x1b5b) || (escape == 0x1b5b33))
                continue;
            
            switch (escape) {
            case 0x1b4f46:
            case 0x1b5b46:
                ch = U_END_ARROW;
                escape = 0;
                break;
            case 0x1b4f48:
            case 0x1b5b48:
                ch = U_HOME_ARROW;
                escape = 0;
                break;
            case 0x1b5b41:
                ch = U_UP_ARROW;
                escape = 0;
                break;
            case 0x1b5b42:
                ch = U_DOWN_ARROW;
                escape = 0;
                break;
            case 0x1b5b43:
                ch = U_RIGHT_ARROW;
                escape = 0;
                break;
            case 0x1b5b44:
                ch = U_LEFT_ARROW;
                escape = 0;
                break;
            case 0x1b5b337e:
                ch = U_DELETE;
                escape = 0;
                break;
            default:
                escape = 0;
            }
        }
        
        if (ch == 0x1b) {
            escape = ch & 0xff;
            continue;
        }
        
        /* Replace carriage return with line feed
           and suppress any following line feed */
        if ((ch == '\n') && (cr)) {
            cr = false;
            continue;
        }
        
        if (ch == '\r') {
            ch = '\n';
            cr = true;
        } else
            cr = false;
        
        /* Backspace */
        if (ch == 0x7f)
            ch = '\b';
        
        indev_push_character(instance->sink, ch);
    }
}

srln_instance_t *srln_init(void)
{
    srln_instance_t *instance
        = malloc(sizeof(srln_instance_t), FRAME_ATOMIC);
    if (instance) {
        instance->thread
            = thread_create(ksrln, (void *) instance, TASK, 0, "ksrln", false);
        
        if (!instance->thread) {
            free(instance);
            return NULL;
        }
        
        instance->sink = NULL;
        indev_initialize("srln", &instance->raw, &srln_raw_ops);
    }
    
    return instance;
}

indev_t *srln_wire(srln_instance_t *instance, indev_t *sink)
{
    ASSERT(instance);
    ASSERT(sink);
    
    instance->sink = sink;
    thread_ready(instance->thread);
    
    return &instance->raw;
}

/** @}
 */