import '@angular/compiler';
import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';

const sourcePath = resolve(
  __dirname,
  '../../frontend/src/app/features/admin/blog/blog-form-modal.component.ts',
);
const source = readFileSync(sourcePath, 'utf8');

describe('BlogFormModalComponent — Escape-to-close contract', () => {
  it('imports HostListener from @angular/core', () => {
    const importBlock = source.match(
      /import\s*\{[\s\S]*?\}\s*from\s*'@angular\/core';/,
    );
    expect(importBlock).not.toBeNull();
    expect(importBlock![0]).toMatch(/\bHostListener\b/);
  });

  it('registers a @HostListener for document:keydown.escape', () => {
    expect(source).toMatch(
      /@HostListener\(\s*['"]document:keydown\.escape['"]\s*\)/,
    );
  });

  it('guards the Escape handler with open() so a closed modal is a no-op', () => {
    const handler = extractEscapeHandler(source);
    expect(handler).not.toBeNull();
    expect(handler).toMatch(/this\.open\(\)/);
  });

  it('guards the Escape handler against in-flight saves (no cancel while saving)', () => {
    const handler = extractEscapeHandler(source);
    expect(handler).not.toBeNull();
    expect(handler).toMatch(/!this\.saving\(\)/);
  });

  it('routes Escape to the existing onCancel() so the parent closes the modal without saving', () => {
    const handler = extractEscapeHandler(source);
    expect(handler).not.toBeNull();
    expect(handler).toMatch(/this\.onCancel\(\)/);
  });

  it('keeps the existing onCancel() emit intact as a regression guard', () => {
    const onCancel = extractMethod(source, 'onCancel');
    expect(onCancel).not.toBeNull();
    expect(onCancel).toMatch(/this\.cancel\.emit\(\s*\)/);
  });
});

function extractEscapeHandler(src: string): string | null {
  // Capture the onEscape handler body — must contain the guard + onCancel call.
  const m = src.match(
    /@HostListener\(\s*['"]document:keydown\.escape['"]\s*\)\s*onEscape\s*\(\s*\)\s*:\s*void\s*\{([^}]*)\}/,
  );
  return m ? m[1] : null;
}

function extractMethod(src: string, name: string): string | null {
  const escaped = name.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
  // Match the method header (with optional TypeScript return-type annotation) and capture the body.
  const re = new RegExp(
    `(?:public\\s+|private\\s+|protected\\s+)?${escaped}\\s*\\([^)]*\\)\\s*(?::\\s*[A-Za-z_<>|[\\]\\s,]+)?\\s*\\{([\\s\\S]*?)\\n\\s*\\}`,
  );
  const m = src.match(re);
  return m ? m[1] : null;
}