#' Create a new preset.
#'
#' A preset is used to specify which methods and inputs should be used for an
#' analysis. Note that the genes to process should normally include the
#' reference genes to be able to assess the results later. The genes will be
#' filtered based on how many species have data for them. Genes which only have
#' orthologs for less than 25% of the input species will be excluded from the
#' preset and the analyis. See the different method functions for the available
#' methods: [clustering()], [correlation()], [neural()], [adjacency()] and
#' [proximity()].
#'
#' @param reference_gene_ids IDs of reference genes to compare to.
#' @param methods List of methods to apply.
#' @param species_ids IDs of species to include.
#' @param gene_ids IDs of genes to screen.
#'
#' @return The preset to use with [analyze()].
#'
#' @export
preset <- function(reference_gene_ids,
                   methods = all_methods(),
                   species_ids = geposan::species$id,
                   gene_ids = geposan::genes$id) {
    # Count included species per gene.
    genes_n_species <- geposan::distances[
        species %chin% species_ids,
        .(n_species = .N),
        by = "gene"
    ]

    # Filter out genes with less than 25% existing orthologs.
    gene_ids_filtered <- genes_n_species[
        gene %chin% gene_ids &
            n_species >= 0.25 * length(species_ids),
        gene
    ]

    # The included data gets sorted to be able to produce predictable hashes
    # for the object later.
    structure(
        list(
            reference_gene_ids = sort(reference_gene_ids),
            methods = methods,
            species_ids = sort(species_ids),
            gene_ids = sort(gene_ids_filtered)
        ),
        class = "geposan_preset"
    )
}

#' S3 method to print a preset object.
#'
#' @param x The preset to print.
#' @param ... Other parameters.
#'
#' @seealso [preset()]
#'
#' @export
print.geposan_preset <- function(x, ...) {
    cat(sprintf(
        paste0(
            "geposan preset:",
            "\n  Reference genes: %i",
            "\n  Included methods: %s",
            "\n  Number of species: %i",
            "\n  Number of genes: %i",
            "\n"
        ),
        length(x$reference_gene_ids),
        paste(sapply(x$methods, function(m) m$id), collapse = ", "),
        length(x$species_ids),
        length(x$gene_ids)
    ))

    invisible(x)
}