/* inv.c */

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "movie.h"
#include "menu.h"


/* prototypes */
void add( char *items, MOVIE_TYPE ***movies, int *nmovies );
void edit();
void list();
void delete();



/*----------------------------------------------------------
  main()
  ----------------------------------------------------------*/
int main( int argc,char **argv ) {
  int more = 1;
  char choice;
  readMovieFile( "movies.dat" );
  while ( more ) {
    choice = showMenu( "a movie","all the movies" );
    switch ( choice ) {
    case 'a': add( "movies",&movies,&nmovies ); break;
    case 'e': edit(); break;
    case 'd': delete(); break;
    case 'l': list(); break;
    case 'q': more = 0; break;
    default: printf( "invalid choice. please try again. " );
    } // end switch
  } // end while
  writeMovieFile( "movies.dat" );
} /* end of main() */



/*----------------------------------------------------------
  add()

  this function is used to add a movie to the inventory.
  the function loops, adding more movies to the inventory
  until the user enters "quit".
  ----------------------------------------------------------*/
void add( char *items, MOVIE_TYPE ***movies, int *nmovies ) {
  MOVIE_TYPE *tmp = readMovie();
  if ( tmp != NULL ) {
    *movies = (MOVIE_TYPE **)realloc( *movies,((*nmovies)+1)*sizeof( MOVIE_TYPE * ));
    if ( *movies != NULL ) {
      (*movies)[*nmovies] = tmp;
      (*nmovies)++;
    }
    else {
      printf( "error! can't add movies!\n" );
    }
  }
} /* end of add() */



/*----------------------------------------------------------
  edit()

  this function is used to edit a movie in the inventory
  ----------------------------------------------------------*/
void edit() {
  char tmp[5];
  int n, i;
  if ( nmovies > 0 ) {
    n = -1;
    while ( n < 0 ) {
      printf( "\nenter number of movie to edit: " );
      scanf( "%d",&n );
      fflush( stdin );
      i = findNumber( n );
    }
    strcpy( tmp,"y" );
    while ( tolower( tmp[0] ) == 'y' ) {
      printf( "movie is: [%s]\n",movies[i]->name );
      printf( "change it (y/n)? " );
      scanf( "%s",tmp );
      fflush( stdin );
      if ( tolower( tmp[0] ) == 'y' ) {
	printf( "enter new movie: " );
	movies[i]->name = fgets( movies[i]->name,MAX,stdin );
	{
	  char *p = strchr( movies[i]->name,'\n' );
	  *p = '\0';
	}
      }
    }
  }
} /* end of edit() */



/*----------------------------------------------------------
  list()

  this function is used to list the movies in the inventory
  ----------------------------------------------------------*/
void list() {
  int i;
  if ( nmovies > 0 ) {
    printf( "\nhere are the movies in the inventory:\n" );
    for ( i=0; i<nmovies; i++ ) {
      printMovie( movies[i] );
    } // end for()
  } // end if
  else {
    printf( "\nthere are no movies in the inventory.\n" );
  } // end else
} /* end of list() */



/*----------------------------------------------------------
  delete()

  this function is used to delete a movie from the inventory
  ----------------------------------------------------------*/
void delete() {
  char tmp[100];
  int n, i, j;
  if ( nmovies > 0 ) {
    n = -1;
    while ( n < 0 ) {
      printf( "\nenter number of movie to delete: " );
      scanf( "%d",&n );
      fflush( stdin );
      i = findNumber( n );
    }
    for ( j=i; j<nmovies-1; j++ ) {
      movies[j] = movies[j+1];
    }
    nmovies--;
  }
} /* end of delete() */



/*----------------------------------------------------------
  findNumber()

  this function finds a movie using its number as an index
  in the inventory. the function returns the index of the
  movie in the movies array; or -1 if the movie is not found
  in the array.
  ----------------------------------------------------------*/
int findNumber( int number ) {
  int i = 0;
  while (( i < nmovies) && ( movies[i]->number != number )) {
    i++;
  }
  if ( movies[i]->number == number ) {
    return i;
  }
  else {
    return -1;
  }
} /* end of findNumber() */