import {
  assert,
  assertEquals,
} from "https://deno.land/std@0.224.0/testing/asserts.ts";
import { extract } from "https://deno.land/std@0.224.0/front_matter/yaml.ts";

/**
 * Proof of Concept: Declarative Frontmatter (YAML UUIDs)
 *
 * Demonstrates extracting UUIDv7 (mocked) from Markdown frontmatter
 * to uniquely identify and trace artifacts within the repository.
 */

const mockMarkdownFile = `---
id: 018f6c3a-1234-7890-abcd-ef0123456789
type: requirements-doc
title: Authentication Specs
legacy_slug: 2024-0512.1.auth.specs
---
# Authentication Specs
This document outlines the authentication specs.
`;

const mockMissingIdMarkdown = `---
type: draft
title: Work in Progress
---
# WIP
Just starting this document.
`;

function parseArtifact(content: string) {
  try {
    const { attrs, body } = extract(content);
    return { frontmatter: attrs as Record<string, unknown>, body };
  } catch (_e) {
    throw new Error("Failed to parse YAML frontmatter");
  }
}

function validateArtifactId(frontmatter: Record<string, unknown>): boolean {
  // Simplistic UUIDv7 regex validation mock
  const uuidRegex =
    /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
  const id = frontmatter.id;

  if (!id || typeof id !== "string") return false;
  return uuidRegex.test(id);
}

if (import.meta.main) {
  console.log("Running Declarative Frontmatter PoC tests...");

  try {
    // 1. Valid Document
    const validDoc = parseArtifact(mockMarkdownFile);
    assertEquals(validDoc.frontmatter.title, "Authentication Specs");
    const isValid = validateArtifactId(validDoc.frontmatter);
    assert(isValid, "Expected valid UUID in frontmatter");
    console.log(`✅ Validated Artifact ID: ${validDoc.frontmatter.id}`);

    // 2. Invalid/Missing ID Document
    const invalidDoc = parseArtifact(mockMissingIdMarkdown);
    const isInvalid = validateArtifactId(invalidDoc.frontmatter);
    assert(!isInvalid, "Expected validation to fail for missing ID");
    console.log(
      `✅ Correctly rejected document missing strict UUIDv7 identifier.`,
    );

    console.log("✅ Declarative Frontmatter PoC successful.");
  } catch (err) {
    console.error("❌ Declarative Frontmatter PoC failed:", err);
    Deno.exit(1);
  }
}