/** @file
 * @brief Read and write user metadata
 */
/* Copyright (C) 2007-2022 Olly Betts
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <https://www.gnu.org/licenses/>.
 */

#include <config.h>

#include <xapian.h>

#include <iostream>
#include <string>

#include <cstdlib> // For exit().
#include <cstring>

using namespace std;

#define PROG_NAME "xapian-metadata"
#define PROG_DESC "Read and write user metadata"

static void show_usage() {
    cout << "Usage: " PROG_NAME " get PATH_TO_DATABASE KEY\n"
            "       " PROG_NAME " list PATH_TO_DATABASE [PREFIX]\n"
            "       " PROG_NAME " set PATH_TO_DATABASE KEY VALUE\n";
}

int
main(int argc, char **argv)
try {
    const char * command = argv[1];
    if (!command) {
syntax_error:
        show_usage();
        exit(1);
    }

    if (command[0] == '-') {
        if (strcmp(command, "--help") == 0) {
            cout << PROG_NAME " - " PROG_DESC "\n\n";
            show_usage();
            exit(0);
        }
        if (strcmp(command, "--version") == 0) {
            cout << PROG_NAME " - " PACKAGE_STRING "\n";
            exit(0);
        }
    }

    if (strcmp(command, "get") == 0) {
        if (argc != 4) goto syntax_error;
        Xapian::Database db(argv[2]);
        cout << db.get_metadata(argv[3]) << '\n';
    } else if (strcmp(command, "list") == 0) {
        if (argc != 3 && argc != 4) goto syntax_error;
        Xapian::Database db(argv[2]);
        string prefix;
        if (argc == 4) prefix = argv[3];
        for (Xapian::TermIterator t = db.metadata_keys_begin(prefix);
             t != db.metadata_keys_end(prefix);
             ++t) {
            cout << *t << '\n';
        }
    } else if (strcmp(command, "set") == 0) {
        if (argc != 5) goto syntax_error;
        Xapian::WritableDatabase db(argv[2], Xapian::DB_CREATE_OR_OPEN);
        db.set_metadata(argv[3], argv[4]);
        db.commit();
    } else {
        goto syntax_error;
    }
} catch (const Xapian::Error &e) {
    cout << e.get_description() << '\n';
    exit(1);
}
