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/* $Id: edfile.c,v 1.2 2007-03-04 22:29:55-08 - - $ */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>

#include "auxlib.h"
#include "list.h"


struct options {
   bool eflag;   /* was the -e flag given? */
   bool wflag; /* was the -s flag given? */
   char *fileargs;    /* points at argv[optind]; */
   int fileargc;      /* dimension of fileargs */
   int optend;
   char* filecmd;
};

void f_a(char* stdinline, list_ref list);
void f_i(char* stdinline, list_ref list);
void f_dollar(list_ref list);
void f_zero (list_ref list);
void f_LT(list_ref list);
void f_GT(list_ref list);
void f_dot(list_ref list);
void f_star(list_ref list);
void f_d(list_ref list);


void scanoptions (struct options *options, int argc, char **argv) {
   extern int opterr, optind, optopt;
   extern char *optarg;
   for (;;) {
    int option = getopt (argc, argv, "we:");
      if (option == EOF) break;
      switch (option) {
         case 'e': options->eflag        = TRUE;
                  //options->filecmd = optarg;
                  break;	
         case 'w': options->wflag = TRUE; options->eflag = FALSE;  break;
         default : eprintf (" -%c: invalid option\n",
                            optopt);
                   //exit_status = EXIT_FAILURE;
      };
   options->optend = optind;
   };

   


STUBPRINTF ("scanoptions: not implemented\n");
}

void badline (int stdincount, char *stdinline) {
   eprintf ("Bad input line %d: %s\n", stdincount, stdinline);
}

void editfile (struct options *options, list_ref list) {
   char stdinline[1024];
   int stdincount = 0;
   for(;; ++stdincount) {
      char *linepos = fgets (stdinline, sizeof stdinline, stdin);
      if (linepos == NULL) break;
      linepos = strchr (stdinline, '\n');
      if (linepos == NULL || stdinline[0] == '\0') {
         badline (stdincount, stdinline);
      }else {
         *linepos = '\0';
         switch (stdinline[0]) {
            case '$': f_dollar(list);
                      STUBPRINTF ("stdin[%d]: $\n", stdincount); break;
            case '*': f_star(list);
                      STUBPRINTF ("stdin[%d]: *\n", stdincount); break;
            case '.': f_dot(list);
                      STUBPRINTF ("stdin[%d]: .\n", stdincount); break;
            case '0': f_zero(list);
                      STUBPRINTF ("stdin[%d]: 0\n", stdincount); break;
            case '<': f_LT(list);
                      STUBPRINTF ("stdin[%d]: <\n", stdincount); break;
            case '>': f_GT(list);
                      STUBPRINTF ("stdin[%d]: >\n", stdincount); break;
            case '@': debugdump_list (list); break;
            case 'a': f_a(stdinline, list);
                      STUBPRINTF ("stdin[%d]: a\n", stdincount); break;
            case 'd': f_d(list);
                      STUBPRINTF ("stdin[%d]: d\n", stdincount); break;
            case 'i': f_i(stdinline,list);
                      STUBPRINTF ("stdin[%d]: i\n", stdincount); 
                      break;
            case 'r': STUBPRINTF ("stdin[%d]: r\n", stdincount); break;
            case 'w': STUBPRINTF ("stdin[%d]: w\n", stdincount); break;
            default : badline (stdincount, stdinline);
         };
      };
   };
}



/* function a appends after the cursor */

void f_a(char* stdinline, list_ref list){
   char* newstring = strdup(stdinline)+1;
   char* viewitem;
   assert(newstring);
   insert_list(list, newstring);
   //setmove_list(list, MOVE_NEXT);
   viewitem = viewcurr_list(list);
   printf("%s\n",viewitem);
}   
   
/* function i appends before the cursor */

void f_i(char* stdinline, list_ref list){
   char* newstring = strdup(stdinline)+1;
   char* viewitem;
   assert(newstring);
   setmove_list(list,MOVE_PREV);
   insert_list(list, newstring);
   viewitem = viewcurr_list(list);
   printf("%s\n",viewitem);
}

/*function a delete the node that cursor points at */

void f_d(list_ref list){
   if(!empty_list(list)){
      delete_list(list);
   }
}
   
/* function dollar allows the user
    to view the last item. 
*/

void f_dollar(list_ref list){
   char *viewitem;
   setmove_list(list, MOVE_LAST);
   viewitem = viewcurr_list(list);
   printf("%s\n",viewitem);
}

/* function zero allows the user to view the head item */

void f_zero (list_ref list){
   char *viewitem;
   setmove_list(list, MOVE_HEAD); 
   viewitem = viewcurr_list(list);
   printf("%s\n",viewitem);
}

/* function < moves the cursor to the prev */

void f_LT(list_ref list){
   char *viewitem;
   setmove_list(list, MOVE_PREV); 
   viewitem = viewcurr_list(list);
   printf("%s\n",viewitem);
}

/* function > moves the cursor to the next */

void f_GT(list_ref list){
   char *viewitem;
   setmove_list(list, MOVE_NEXT); 
   viewitem = viewcurr_list(list);
   printf("%s\n",viewitem);
}

/* function dot allows the user to view the current item */

void f_dot(list_ref list){
   char *viewitem; 
   viewitem = viewcurr_list(list);
   printf("%s\n",viewitem);
}

/* function star prints out everything in the list, 
   leaves the cursor at the end                   */

void f_star(list_ref list){
   char *viewitem;
   bool thisisahack = FALSE;
   for(setmove_list(list, MOVE_HEAD); hasNext(list);
       setmove_list(list, MOVE_NEXT)){
       viewitem = viewcurr_list(list);
       printf("%s\n",viewitem);
       thisisahack = TRUE;
    }
    if(thisisahack == TRUE){
       viewitem = viewcurr_list(list);
       printf("%s\n",viewitem);
    }
}

void putinqueue (list_ref list, FILE *input, char *filename) {
   char buffer[1024];
   int linenr;
   for (linenr = 1; ; ++linenr) {
      char *linepos = fgets (buffer, sizeof buffer, input);
      if (linepos == NULL) break;
      linepos = strchr (buffer, '\n');
      if (linepos == NULL) {
         eprintf ("%: %s[%d]: unterminated line\n", filename, linenr);
      }else {
         *linepos = '\0';
      };
      linepos = strdup (buffer);
      assert (linepos != NULL);
      f_a ( linepos, list);
   };
}

void putfileinqueue (list_ref list, char *filename) {
   FILE *input = fopen (filename, "r");
   if (input == NULL) {
      syseprintf (filename);
   }else {
      putinqueue (list, input, filename);
      if (fclose (input)) syseprintf (filename);
   };
}



/* main program */

int main (int argc, char **argv) {
   struct options options;
   list_ref list = NULL;
   int argi = 0; 
   bzero (&options, sizeof options);
   set_progname (argv[0]);
   scanoptions (&options, argc, argv);
   argi = 1;
   list = new_list();
   
   for (argi=options.optend; argi < argc; ++argi) {
      printf("dfkjdslkf\n");
      putfileinqueue(list, argv[argi]);
   }
   
   editfile (&options, list);
   free_list (list); list = NULL;
   return get_exitcode();
}