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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License
 * as published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the Gnome Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/* find.c: index file searching ops */

#include <string.h>

#include "ibex_internal.h"

/**
 * ibex_find: search an ibex for a word
 * @ib: an ibex
 * @word: the word
 *
 * This routine searches an ibex for a word and returns a GPtrArray
 * containing the names of the files in the ibex that contain the word.
 * If no matches are found, it will return an empty array (not NULL).
 * The caller must free the array, but MUST NOT free or alter its
 * elements.
 *
 * Return value: the array of filenames containing @word
 **/
GPtrArray *
ibex_find (ibex *ib, char *word)
{
    GPtrArray *refs, *ret;
    ibex_file *ibf;
    int i;

    ret = g_ptr_array_new ();
    refs = g_hash_table_lookup (ib->words, word);
    if (refs) {
        for (i = 0; i < refs->len; i++) {
            ibf = g_ptr_array_index (refs, i);
            g_ptr_array_add (ret, ibf->name);
        }
    }
    return ret;
}

/**
 * ibex_find_name: Check if a word occurs in a given file
 * @ib: an ibex
 * @name: a filename
 * @word: a word
 *
 * This checks if the given word occurs in the given file.
 *
 * Return value: TRUE or FALSE
 **/
gboolean
ibex_find_name (ibex *ib, char *name, char *word)
{
    GPtrArray *refs;
    ibex_file *ibf;
    int i;

    refs = g_hash_table_lookup (ib->words, word);
    if (refs) {
        for (i = 0; i < refs->len; i++) {
            ibf = g_ptr_array_index (refs, i);
            if (!strcmp (ibf->name, name))
                return TRUE;
        }
    }
    return FALSE;
}

static gint
build_array (gpointer key, gpointer value, gpointer data)
{
    char *name = key;
    unsigned int count = GPOINTER_TO_UINT (value);
    GPtrArray *ret = data;

    if (count == 1)
        g_ptr_array_add (ret, name);
    return FALSE;
}

/**
 * ibex_find_all: Find files containing multiple words
 * @ib: an ibex
 * @words: a GPtrArray of words
 *
 * This works like ibex_find(), but returns an array of filenames
 * which contain all of the words in @words.
 *
 * Return value: an array of matches
 **/
GPtrArray *
ibex_find_all (ibex *ib, GPtrArray *words)
{
    GTree *work;
    GPtrArray *wrefs, *ret;
    int i, j, count;
    char *word;
    ibex_file *ibf;

    if (words->len == 0)
        return g_ptr_array_new ();
    else if (words->len == 1)
        return ibex_find (ib, g_ptr_array_index (words, 0));

    work = g_tree_new (strcmp);
    for (i = 0; i < words->len; i++) {
        word = g_ptr_array_index (words, i);
        wrefs = g_hash_table_lookup (ib->words, word);
        if (!wrefs) {
            /* One of the words isn't even in the index. */
            g_tree_destroy (work);
            return g_ptr_array_new ();
        }

        if (i == 0) {
            /* Copy the references into a tree, using the
             * filenames as keys and the size of words as
             * the value.
             */
            for (j = 0; j < wrefs->len; j++) {
                ibf = g_ptr_array_index (wrefs, j);
                g_tree_insert (work, ibf->name,
                           GUINT_TO_POINTER (words->len));
            }
        } else {
            /* Increment the counts in the working tree
             * for the references for this word.
             */
            for (j = 0; j < wrefs->len; j++) {
                ibf = g_ptr_array_index (wrefs, j);
                count = GPOINTER_TO_UINT (g_tree_lookup (work, ibf->name));
                if (count) {
                    g_tree_insert (work, ibf->name,
                               GUINT_TO_POINTER (count - 1));
                }
            }
        }
    }

    /* Build an array with the refs that contain all the words. */
    ret = g_ptr_array_new ();
    g_tree_traverse (work, build_array, G_IN_ORDER, ret);
    g_tree_destroy (work);
    return ret;
}