org.incendo.cloud.minecraft.extras.Pagination Maven / Gradle / Ivy

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//
// MIT License
//
// Copyright (c) 2024 Incendo
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
package org.incendo.cloud.minecraft.extras;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.BiFunction;
import net.kyori.adventure.text.Component;
import org.checkerframework.checker.nullness.qual.NonNull;

final class Pagination {

    private final BiFunction> headerRenderer;
    private final BiFunction rowRenderer;
    private final BiFunction footerRenderer;
    private final BiFunction outOfRangeRenderer;

    Pagination(
            final @NonNull BiFunction> headerRenderer,
            final @NonNull BiFunction rowRenderer,
            final @NonNull BiFunction footerRenderer,
            final @NonNull BiFunction outOfRangeRenderer
    ) {
        this.headerRenderer = headerRenderer;
        this.rowRenderer = rowRenderer;
        this.footerRenderer = footerRenderer;
        this.outOfRangeRenderer = outOfRangeRenderer;
    }

    @NonNull List render(
            final @NonNull List content,
            final int page,
            final int itemsPerPage
    ) {
        final int pages = (int) Math.ceil(content.size() / (itemsPerPage * 1.00));
        if (page < 1 || page > pages) {
            return Collections.singletonList(this.outOfRangeRenderer.apply(page, pages));
        }

        final List renderedContent = new ArrayList<>(this.headerRenderer.apply(page, pages));

        final int start = itemsPerPage * (page - 1);
        final int maxIndex = (start + itemsPerPage);
        for (int index = start; index < maxIndex; index++) {
            if (index > content.size() - 1) {
                break;
            }
            renderedContent.add(this.rowRenderer.apply(content.get(index), index == maxIndex - 1));
        }

        renderedContent.add(this.footerRenderer.apply(page, pages));

        return Collections.unmodifiableList(renderedContent);
    }
}