/*
 *    Copyright 2025 Jared Davis
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */


use crate::lab::Lab;

pub struct Palette(Vec<Lab>);

impl From<Vec<Lab>> for Palette {
    fn from(v: Vec<Lab>) -> Self {
        Palette(v)
    }
}

impl Palette {
    pub fn filter<F>(self, target: Lab, norm: F, epsilon: f32) -> Vec<Lab>
    where F: Fn(Lab, Lab) -> f32
    {
        self.0
            .into_iter()
            .filter_map(|source| {
                if norm(source, target) < epsilon {
                    Some(source)
                } else {
                    None
                }
            })
            .collect()
    }
}


