#' @export
summary.cutpointr <- function(object, ...) {
    x_summary <- vector("list", nrow(object))
    names(x_summary) <- suppressWarnings(object$subgroup)
    for (r in 1:nrow(object)) {
        temprow <- object[r, ]
        if (has_column(object, "subgroup")) {
            x_summary[[r]]$subgroup <- temprow$subgroup
        }
        x_summary[[r]]$cutpointr <- temprow
        x_summary[[r]]$desc <- temprow$data[[1]] %>%
            dplyr::select_(as.name(temprow$predictor)) %>%
            unlist %>%
            summary_sd
        x_summary[[r]]$desc_byclass <-
            split(temprow$data[[1]], temprow$data[[1]][, temprow$outcome]) %>%
            purrr::map(function(x) {
                dat <- x[, temprow$predictor]
                dat <- unlist(dat)
                summary_sd(dat)
            })
        x_summary[[r]]$desc_byclass <- data.frame(do.call(rbind, x_summary[[r]]$desc_byclass))
        colnames(x_summary[[r]]$desc_byclass) <- c("Min.", "5%", "1st Qu.", "Median",
                                                   "Mean", "3rd Qu.", "95%", "Max", "SD")
        x_summary[[r]]$n_obs <- nrow(temprow$data[[1]])
        x_summary[[r]]$n_pos <- temprow$data[[1]] %>%
            dplyr::select_(as.name(temprow$outcome)) %>%
            unlist %>% (function(x) sum(x == temprow$pos_class))
        x_summary[[r]]$n_neg <- x_summary[[r]]$n_obs - x_summary[[r]]$n_pos
        # Confusion Matrix
        oi <- get_opt_ind(temprow$roc_curve[[1]],
                          oc = unlist(temprow$optimal_cutpoint),
                          direction = temprow$direction)
        x_summary[[r]]$confusion_matrix <- data.frame(
            cutpoint = unlist(temprow$optimal_cutpoint),
            temprow$roc_curve[[1]][oi, c("tp", "fn", "fp", "tn")]
        )
        if (has_boot_results(temprow)) {
            x_summary[[r]][["boot"]] <- purrr::map(temprow[["boot"]][[1]][, 1:13], function(x) {
                round(summary_sd(x), 4)
            })
            x_summary[[r]][["boot"]] <- do.call(rbind, x_summary[[r]][["boot"]])
            x_summary[[r]][["boot"]] <- as.data.frame(x_summary[[r]][["boot"]])
            x_summary[[r]][["boot"]] <- tibble::rownames_to_column(x_summary[[r]][["boot"]],
                                                              var = "Variable")
            x_summary[[r]]$boot_runs <- nrow(temprow[["boot"]][[1]])
        }
    }
    x_summary <- purrr::map_df(x_summary, tidy_summary)
    class(x_summary) <- c("summary_cutpointr", class(x_summary))
    return(x_summary)
}

# Convert the list output of summary.cutpointr to a data.frame
# x is a single element of the resulting list from summary.cutpointr.
tidy_summary <- function(x) {
    desc <- as.data.frame(matrix(x$desc, nrow = 1,
                                dimnames = list(NULL, names(x$desc))),
                         row.names = "")
    res <- tibble::tibble(
        cutpointr = list(x$cutpointr),
        desc = list(desc),
        desc_by_class = list(x$desc_byclass),
        n_obs = x$n_obs, n_pos = x$n_pos, n_neg = x$n_neg,
        confusion_matrix = list(x$confusion_matrix)
    )
    if (has_boot_results(x)) {
        res <- dplyr::bind_cols(res,
                                tidyr::nest_(x[["boot"]], key_col = "boot"),
                                boot_runs = x$boot_runs)
    }
    if (has_column(x, "subgroup")) {
        res <- dplyr::bind_cols(subgroup = x$subgroup, res)
    }
    return(res)
}