import type { PrintConfig } from "./types";

export const PRINT_DEFAULTS: PrintConfig = {
  columns: 2,
  margin: 10,
  gap: 5,
  font: 9,
  title: "",
  pageNumbers: true,
  cutMarks: true,
};

function toNumber(value: unknown, fallback: number): number {
  const n = typeof value === "number" ? value : Number(value);
  return Number.isFinite(n) ? n : fallback;
}

function toBoolean(value: unknown, fallback: boolean): boolean {
  if (typeof value === "boolean") return value;
  if (typeof value === "string") {
    const s = value.trim().toLowerCase();
    if (["true", "1", "yes", "on"].includes(s)) return true;
    if (["false", "0", "no", "off"].includes(s)) return false;
  }
  return fallback;
}

function clamp(value: number, min: number, max: number): number {
  return Math.min(max, Math.max(min, value));
}

/**
 * Normalize directive attributes / YAML `data-config` into a usable config.
 * Values may arrive as strings (directive attributes) or numbers/booleans
 * (YAML `data-config`), so everything is coerced and clamped.
 */
export function normalizePrintConfig(
  input: Partial<Record<keyof PrintConfig, unknown>> = {},
): PrintConfig {
  return {
    columns: Math.round(
      clamp(toNumber(input.columns, PRINT_DEFAULTS.columns), 1, 4),
    ),
    margin: clamp(toNumber(input.margin, PRINT_DEFAULTS.margin), 5, 40),
    gap: clamp(toNumber(input.gap, PRINT_DEFAULTS.gap), 0, 20),
    font: clamp(toNumber(input.font, PRINT_DEFAULTS.font), 6, 16),
    title:
      typeof input.title === "string" ? input.title : PRINT_DEFAULTS.title,
    pageNumbers: toBoolean(input.pageNumbers, PRINT_DEFAULTS.pageNumbers),
    cutMarks: toBoolean(input.cutMarks, PRINT_DEFAULTS.cutMarks),
  };
}