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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2011 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */

#include <stdio.h>
#include <errno.h>

#include "service.h"
#include "io.h"
#include "pblock.h"
#include "protocol.h"

#include <sys/sendfile.h>

// TODO: system sendfile Abstraktionen in neue Datei auslagern
/*
ssize_t sys_sendfile(int out_fd, int in_fd, off_t *off, size_t len) {
    
}
*/
#define sys_sendfile sendfile


/*
 * prepares for servicing a file
 *
 * adds content-length header and starts the response
 *
 * return the file descriptor or an error code
 */
int prepare_service_file(Session *sn, Request *rq) {
    char *ppath = pblock_findkeyval(pb_key_ppath, rq->vars);

    /* open the file */
    int fd = open(ppath, O_RDONLY);
    if(fd < 0) {
        perror("prepare_service_file: open");

        int status = 500;
        switch(errno) {
            case EACCES: {
                status = 403;
                break;
            }
            case ENOENT: {
                status = 404;
                break;
            }
        }
        protocol_status(sn, rq, status, NULL);
        return -1;
    }

    /* get stat */
    struct stat stat;
    if (fstat(fd, &stat) != 0) {
        perror("prepare_service_file: stat");

        protocol_status(sn, rq, 500, NULL);
        return -1;
    }

    /* add content-length header*/
    char contentLength[32];
    int len = snprintf(contentLength, 32, "%d", stat.st_size);

    pblock_kvinsert(pb_key_content_length, contentLength, len, rq->srvhdrs);

    /* start response */
    protocol_status(sn, rq, 200, NULL);
    http_start_response(sn, rq);

    return fd;
}

int test_service(pblock *pb, Session *sn, Request *rq) {
    printf("test_service\n");

    int fd = prepare_service_file(sn, rq);
    if(fd < 0) {
        /* TODO: service error */
        http_start_response(sn, rq);
        return REQ_PROCEED;
    }

    /* send file*/
    SystemIOStream *io = (SystemIOStream*) sn->csd;

    off_t fileoffset = 0;
    int len = atoi(pblock_findkeyval(pb_key_content_length, rq->srvhdrs));
    printf("content-length: %d\n", len);
    sendfile(io->fd, fd, &fileoffset, len);

    close(fd);

    return REQ_PROCEED;
}