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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2019 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

use filters::filter::Filter;
use regex::Regex;
use regex::Error as RError;

use libimagstore::store::Entry;

pub trait IntoRegex {

    fn into_regex(self) -> Result<Regex, RError>;

}

impl<'a> IntoRegex for &'a str {

    fn into_regex(self) -> Result<Regex, RError> {
        Regex::new(self)
    }
}

impl<'a> IntoRegex for Regex {

    fn into_regex(self) -> Result<Regex, RError> {
        Ok(self)
    }
}

pub struct ContentGrep {
    regex: Regex,
}

impl ContentGrep {

    pub fn new<IR>(regex: IR) -> Result<ContentGrep, RError>
        where IR: IntoRegex
    {
        regex.into_regex()
            .map(|reg| {
                ContentGrep {
                    regex: reg,
                }
            })
    }

}

impl Filter<Entry> for ContentGrep {

    fn filter(&self, e: &Entry) -> bool {
        self.regex.captures(&e.get_content()[..]).is_some()
    }

}