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

function escapeMarkdown(value: unknown) {
  return String(value ?? "")
    .replace(/\\/g, "\\\\")
    .replace(/[|*_\x60[\]<>]/g, "\\$&")
    .replace(/\r?\n/g, " ");
}

function jsonFence(value: unknown) {
  const json = JSON.stringify(value, null, 2);
  const backticks = Math.max(3, Math.max(...(json.match(/\x60+/g) ?? [""]).map((match) => match.length)) + 1);
  const fence = "\x60".repeat(backticks);
  return [fence + "json", json, fence];
}

export function inspectionToMarkdown(result: InspectionResult): string {
  const lines = [
    "# CertScope report — " + escapeMarkdown(result.host),
    "",
    "- Inspected: " + escapeMarkdown(result.inspectedAt),
    "- Addresses: " + escapeMarkdown(result.addresses.join(", ") || "none"),
    "- Overall health: " + result.score.overall + "/100",
    "- DNS: " + result.score.categories.dns + "/100",
    "- TLS: " + result.score.categories.tls + "/100",
    "- HTTP: " + result.score.categories.http + "/100",
    "- Score formula: equal-weighted average of the DNS, TLS and HTTP category scores",
    "- Completeness: " + result.completeness.status + " (" + result.completeness.complete + "/" + result.completeness.total + " collectors complete)",
    "",
    "## Collector status",
    "",
  ];

  for (const [category, status] of Object.entries(result.completeness.collectors)) {
    lines.push("- " + category.toUpperCase() + ": " + escapeMarkdown(status));
  }
  if (result.completeness.issues.length) lines.push("- Collector issues: " + escapeMarkdown(result.completeness.issues.join("; ")));
  lines.push("", "## Findings", "");

  if (!result.findings.length) lines.push("No findings.", "");
  for (const finding of result.findings) {
    lines.push("### " + escapeMarkdown(finding.title));
    lines.push("- Severity: " + escapeMarkdown(finding.severity));
    lines.push("- Category: " + escapeMarkdown(finding.category));
    lines.push("- Score impact: " + finding.scoreImpact);
    lines.push("- Summary: " + escapeMarkdown(finding.summary));
    lines.push("- Evidence: " + escapeMarkdown(finding.evidence.join(", ") || "none"));
    if (finding.remediation) lines.push("- Remediation: " + escapeMarkdown(finding.remediation));
    lines.push("");
  }

  for (const [title, evidence] of [["DNS", result.dns], ["TLS", result.tls], ["HTTP", result.http]] as const) {
    lines.push("## " + title + " evidence", "", ...jsonFence(evidence), "");
  }
  return lines.join("\n");
}