#include <assert.h>

/*
** Generate text describing all changes.  Prepend zPrefix to each line
** of output.
**
** We assume that vfile_check_signature has been run.
**
** If missingIsFatal is true, then any files that are missing or which
** are not true files results in a fatal error.
*/
static void status_report(
  Blob *report,          /* Append the status report here */
  const char *zPrefix,   /* Prefix on each line of the report */
  int missingIsFatal     /* MISSING and NOT_A_FILE are fatal errors */
){
  Stmt q;
  int nPrefix = strlen(zPrefix);
  int nErr = 0;
  db_prepare(&q, 
    "SELECT pathname, deleted, chnged, rid, coalesce(origname!=pathname,0)"
    "  FROM vfile "
    " WHERE file_is_selected(id)"
    "   AND (chnged OR deleted OR rid=0 OR pathname!=origname) ORDER BY 1"
  );
  while( db_step(&q)==SQLITE_ROW ){
    const char *zPathname = db_column_text(&q,0);
    int isDeleted = db_column_int(&q, 1);
    int isChnged = db_column_int(&q,2);
    int isNew = db_column_int(&q,3)==0;
    int isRenamed = db_column_int(&q,4);
    char *zFullName = mprintf("%s/%s", g.zLocalRoot, zPathname);
    blob_append(report, zPrefix, nPrefix);
    if( isDeleted ){
      blob_appendf(report, "DELETED    %s\n", zPathname);
    }else if( !file_isfile(zFullName) ){
      if( access(zFullName, 0)==0 ){
        blob_appendf(report, "NOT_A_FILE %s\n", zPathname);
        if( missingIsFatal ){
          fossil_warning("not a file: %s", zPathname);
          nErr++;
        }
      }else{
        blob_appendf(report, "MISSING    %s\n", zPathname);
        if( missingIsFatal ){
          fossil_warning("missing file: %s", zPathname);
          nErr++;
        }
      }
    }else if( isNew ){
      blob_appendf(report, "ADDED      %s\n", zPathname);
    }else if( isDeleted ){
      blob_appendf(report, "DELETED    %s\n", zPathname);
    }else if( isChnged==2 ){
      blob_appendf(report, "UPDATED_BY_MERGE %s\n", zPathname);
    }else if( isChnged==3 ){
      blob_appendf(report, "ADDED_BY_MERGE %s\n", zPathname);
    }else if( isChnged==1 ){
      blob_appendf(report, "EDITED     %s\n", zPathname);
    }else if( isRenamed ){
      blob_appendf(report, "RENAMED    %s\n", zPathname);
    }
    free(zFullName);
  }
  db_finalize(&q);
  db_prepare(&q, "SELECT uuid FROM vmerge JOIN blob ON merge=rid"
                 " WHERE id=0");
  while( db_step(&q)==SQLITE_ROW ){
    blob_append(report, zPrefix, nPrefix);
    blob_appendf(report, "MERGED_WITH %s\n", db_column_text(&q, 0));
  }
  db_finalize(&q);
  if( nErr ){
    fossil_fatal("aborting due to prior errors");
  }
}

/*
** COMMAND: changes
**
** Usage: %fossil changes
**
** Report on the edit status of all files in the current checkout.
** See also the "status" and "extra" commands.
*/
void changes_cmd(void){
  Blob report;
  int vid;
  db_must_be_within_tree();
  blob_zero(&report);
  vid = db_lget_int("checkout", 0);
  vfile_check_signature(vid, 0);
  status_report(&report, "", 0);
  blob_write_to_file(&report, "-");
}

/*
** COMMAND: status
**
** Usage: %fossil status

  int vid;
  Stmt q;
  int isBrief;

  isBrief = find_option("l","l", 0)==0;
  db_must_be_within_tree();
  vid = db_lget_int("checkout", 0);
  vfile_check_signature(vid, 0);
  db_prepare(&q,
     "SELECT pathname, deleted, rid, chnged, coalesce(origname!=pathname,0)"
     "  FROM vfile"
     " ORDER BY 1"
  );
  while( db_step(&q)==SQLITE_ROW ){
    const char *zPathname = db_column_text(&q,0);
    int isDeleted = db_column_int(&q, 1);
    int isNew = db_column_int(&q,2)==0;
    int chnged = db_column_int(&q,3);
    int renamed = db_column_int(&q,4);
    char *zFullName = mprintf("%s/%s", g.zLocalRoot, zPathname);
    if( isBrief ){
      printf("%s\n", zPathname);
    }else if( isNew ){
      printf("ADDED      %s\n", zPathname);
    }else if( !file_isfile(zFullName) ){
      if( access(zFullName, 0)==0 ){
        printf("NOT_A_FILE %s\n", zPathname);
      }else{
        printf("MISSING    %s\n", zPathname);
      }
    }else if( isDeleted ){
      printf("DELETED    %s\n", zPathname);
    }else if( chnged ){
      printf("EDITED     %s\n", zPathname);
    }else if( renamed ){
      printf("RENAMED    %s\n", zPathname);
    }else{
      printf("UNCHANGED  %s\n", zPathname);
    }
    free(zFullName);
  }
  db_finalize(&q);
}

/*

  if( g.markPrivate ){
    blob_append(&text,
      "# PRIVATE BRANCH: This check-in will be private and will not sync to\n"
      "# repositories.\n"
      "#\n", -1
    );
  }
  status_report(&text, "# ", 1);
  zEditor = db_get("editor", 0);
  if( zEditor==0 ){
    zEditor = getenv("VISUAL");
  }
  if( zEditor==0 ){
    zEditor = getenv("EDITOR");
  }

**     2:   There is no existing checkout
*/
int unsaved_changes(void){
  int vid;
  db_must_be_within_tree();
  vid = db_lget_int("checkout",0);
  if( vid==0 ) return 2;
  vfile_check_signature(vid, 1);
  return db_exists("SELECT 1 FROM vfile WHERE chnged"
                   " OR coalesce(origname!=pathname,0)");
}

/*
** Undo the current check-out.  Unlink all files from the disk.
** Clear the VFILE table.

*/
static void diff_all_against_disk(const char *zFrom, const char *zDiffCmd){
  int vid;
  Blob sql;
  Stmt q;

  vid = db_lget_int("checkout", 0);
  vfile_check_signature(vid, 1);
  blob_zero(&sql);
  db_begin_transaction();
  if( zFrom ){
    int rid = name_to_rid(zFrom);
    if( !is_a_version(rid) ){
      fossil_fatal("no such check-in: %s", zFrom);
    }

  if( pid<=0 ){
    fossil_panic("cannot find a common ancestor between the current"
                 "checkout and %s", g.argv[2]);
  }
  if( pid>1 && !db_exists("SELECT 1 FROM plink WHERE cid=%d", pid) ){
    fossil_panic("not a version: record #%d", mid);
  }
  vfile_check_signature(vid, 1);
  db_begin_transaction();
  undo_begin();
  load_vfile_from_rid(mid);
  load_vfile_from_rid(pid);

  /*
  ** The vfile.pathname field is used to match files against each other.  The

    }
    tid = db_int(0, "SELECT rid FROM leaves, event"
                    " WHERE event.objid=leaves.rid"
                    " ORDER BY event.mtime DESC"); 
  }

  db_begin_transaction();
  vfile_check_signature(vid, 1);
  undo_begin();
  load_vfile_from_rid(tid);

  /*
  ** The record.fn field is used to match files against each other.  The
  ** FV table contains one row for each each unique filename in
  ** in the current checkout, the pivot, and the version being merged.

** Set the VFILE.CHNGED field on every file that has changed.  Also 
** set VFILE.CHNGED on every folder that contains a file or folder 
** that has changed.
**
** If VFILE.DELETED is null or if VFILE.RID is zero, then we can assume
** the file has changed without having the check the on-disk image.
*/
void vfile_check_signature(int vid, int notFileIsFatal){
  int nErr = 0;
  Stmt q;
  Blob fileCksum, origCksum;
  int checkMtime = db_get_boolean("mtime-changes", 0);

  db_begin_transaction();
  db_prepare(&q, "SELECT id, %Q || pathname,"

    id = db_column_int(&q, 0);
    zName = db_column_text(&q, 1);
    rid = db_column_int(&q, 2);
    isDeleted = db_column_int(&q, 3);
    oldChnged = db_column_int(&q, 4);
    oldMtime = db_column_int64(&q, 6);
    if( !file_isfile(zName) && file_size(zName)>=0 ){
      if( notFileIsFatal ){
        fossil_warning("not a ordinary file: %s", zName);
        nErr++;

      }
      chnged = 1;
    }else if( oldChnged>=2 ){
      chnged = oldChnged;
    }else if( isDeleted || rid==0 ){
      chnged = 1;
    }
    if( chnged!=1 ){
      currentMtime = file_mtime(zName);
    }