/** @file
 * @brief Extract text from Abiword documents.
 */
/* Copyright (C) 2020,2025 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 "abiwordparser.h"

#include <ctime>

#include "strptime.h"
#include "timegm.h"

using namespace std;

// Dummy std::string to point target at, but we actually parse the value into
// the time_t created member variable.
static string created_dummy_string;

bool
AbiwordParser::opening_tag(const string& tag)
{
    if (target != nullptr) return true;

    if (tag == "m") {
        string value;
        if (!get_attribute("key", value)) return true;

        if (value == "dc.subject") {
            // Abiword uses abiword.keywords for keywords - dc.subject
            // comes from a text field labelled "Subject".  Let's just treat
            // it as more keywords.
            target = &keywords;
        } else if (value == "dc.title") {
            target = &title;
        } else if (value == "dc.description") {
            target = &sample;
        } else if (value == "dc.creator" || value == "dc.contributor") {
            target = &author;
        } else if (value == "dc.date") {
            // Seems to be used as created date (with abiword.date_last_changed
            // used for the last modified date).  A quick peek at the Abiword
            // code suggests it preserves "dc.date" on "Save" but updates it on
            // "Save As".
            target = &created_dummy_string;
        } else if (value == "abiword.keywords") {
            target = &keywords;
        }
    } else if (tag == "section") {
        target = &dump;
    }
    return true;
}

bool
AbiwordParser::closing_tag(const string& tag)
{
    if (tag == "m" || tag == "section")
        target = nullptr;
    return true;
}

void
AbiwordParser::process_content(const string& content)
{
    if (!target) return;

    if (target == &created_dummy_string) {
        if (created != time_t(-1)) return;

        // E.g. Sun Jul 26 20:07:54 2020
        struct tm tm = {};
        if (strptime(content.c_str(), "%a %b %d %T %Y", &tm)) {
            // Testing shows abiword writes the timestamp in the creator's
            // timezone, but which timezone that is does not seem to be
            // recorded in the saved file so we convert assuming UTC as that's
            // at least fairly central in the range of possibilities.
            created = timegm(&tm);
        }
        return;
    }

    if (!target->empty()) *target += ' ';
    *target += content;
}
