import type { Category, Finding, InspectionScore } from "./types";

const CATEGORY_ORDER: Category[] = ["dns", "tls", "http"];

function clamp(value: number) {
  return Math.max(0, Math.min(100, Math.round(value)));
}

/**
 * Scores are calculated per category first, then averaged equally. This keeps
 * one category's findings from being charged again against the global score.
 */
export function score(findings: Finding[]): InspectionScore {
  const categories: Record<Category, number> = { dns: 100, tls: 100, http: 100 };
  for (const finding of findings) {
    const impact = Number.isFinite(finding.scoreImpact) ? Math.min(0, finding.scoreImpact) : 0;
    categories[finding.category] = clamp(categories[finding.category] + impact);
  }

  const overall = clamp(CATEGORY_ORDER.reduce((sum, category) => sum + categories[category], 0) / CATEGORY_ORDER.length);
  return { overall, deductions: 100 - overall, categories };
}