package com.social.media.interfaces.web.dto.shared;

import com.fasterxml.jackson.annotation.JsonInclude;
import java.util.List;

/**
 * Generic paginated response wrapper
 */
@JsonInclude(JsonInclude.Include.NON_NULL)
public record PageResponse<T>(
    List<T> content,
    int number,
    int size,
    long totalElements,
    int totalPages,
    boolean first,
    boolean last
) {
    
    public static <T> PageResponse<T> of(List<T> content, int page, int size, long totalElements) {
        int totalPages = (int) Math.ceil((double) totalElements / size);
        return new PageResponse<>(
            content,
            page,
            size,
            totalElements,
            totalPages,
            page == 0,
            page >= totalPages - 1
        );
    }
    
    public static <T> PageResponse<T> empty(int page, int size) {
        return new PageResponse<>(
            List.of(),
            page,
            size,
            0,
            0,
            true,
            true
        );
    }
}