/* input.c */

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "globals.h"

extern int  prepare_subtitle (char *, Image **, Image **);

/*
 * add Input to the list of Inputs
 */

Input ** add_input (Input **input, struct timeval tv, Image *image) {
    *input = (Input *) malloc (sizeof (Input));
    (*input)->time = TIMEVAL_IN_USEC (tv);
    (*input)->image = image;
    (*input)->x = (win_width  - image->width)/2;
    (*input)->y = (win_height - image->height)/2;
    (*input)->next = (Input *) NULL;
    return &((*input)->next);
}

/*
 * takes a string of three numbers separated by colons, i.e. 00:00:00.00
 * The last number can be floatinf point.  The three numbers are separated
 * and and recombined in the form of the timeval structure.
 * This structure is returned.
 */

struct timeval ascii_to_timeval (char *ascii) {
    char *temp, *ptr, **next;
    struct timeval tv;
    char colon [] = ":";
    long hr, min;
    double fsec, sec, usec;

    ptr = ascii;
    next = &ptr;
    temp = strsep (next, colon);
    hr = atol (temp);
    temp = strsep (next, colon);
    min = atol (temp);
    fsec = (double) atof (*next);
    usec = 1000000 * modf (fsec, &sec);
    tv.tv_sec  = (long) ((hr * 60 * 60) + (min * 60) + sec);
    tv.tv_usec = (long) usec;
    return tv;
}

/*
 * Read in the input file and place Inputs into an unsorted linked list.
 */

void read_inputs (Input **ptr) {
    int length;
    char *string_ptr, string [MAX_STRING_SIZE];
    char **next, *start, *end;
    const char whitespace [] = " \f\r\t\v";
    Image *put, *clear;

    while ( fgets (string, sizeof (string), stdin) ) {
	length = strlen (string);
	string [length-1] = (char) NULL;
	string_ptr = string;
	next = &string_ptr;
	start = strsep (next, whitespace);
	end = strsep (next, whitespace);
	prepare_subtitle (*next, &put, &clear);
	ptr = add_input (ptr, ascii_to_timeval (start), put);
	ptr = add_input (ptr, ascii_to_timeval (end), clear);
    }
}