export const opening = '<message xmlns="jabber:client"><body>';
export const closing = '</body></message>';
export const message = text => opening + text + closing;
export const valid = message('finite fixture');
export const deep = n => '<message xmlns="jabber:client">' + '<x>'.repeat(n - 1) +
  '</x>'.repeat(n - 1) + '</message>';
export const elements = n => '<message xmlns="jabber:client">' + '<x/>'.repeat(n - 1) + '</message>';
export const attributes = n => '<message xmlns="jabber:client"' +
  Array.from({length: n - 1}, (_, i) => ` a${i}="x"`).join('') + '/>';
export function boundary() {
  // 16 attributes / 1024 name+value UTF-16 units including xmlns.
  let attrs = ' xmlns="jabber:client"';
  let chars = 'xmlns'.length + 'jabber:client'.length;
  for (let i = 0; i < 15; i++) {
    const name = `a${i}`;
    const value = 'v'.repeat(i === 14 ? 1024 - chars - name.length : 60);
    attrs += ` ${name}="${value}"`;
    chars += name.length + value.length;
  }
  // Root + body + chain of 7 + 23 siblings = 32 elements; depth 8.
  const before = `<message${attrs}><body>`;
  const after = '</body>' + '<x>'.repeat(7) + '</x>'.repeat(7) + '<x/>'.repeat(23) + '</message>';
  return {xml: before + 'z'.repeat(4096 - before.length - after.length) + after,
    body: 'z'.repeat(4096 - before.length - after.length)};
}
export const invalid = [
  ['large stock body', message('b'.repeat(1048576)), 'bytes'],
  ['deep stock XML', deep(257), 'depth'],
  ['unfinished opening', opening, 'invalid-xml'],
  ['unfinished attribute', '<message xmlns="jabber:client" a="unfinished', 'invalid-xml'],
  ['unfinished tag', '<message xmlns="jabber:client"', 'invalid-xml'],
  ['unfinished entity', message('&amp'), 'invalid-xml'],
  ['empty', '', 'framing'],
  ['leading whitespace', ' ' + valid, 'framing'],
  ['text only', 'not xml', 'framing'],
  ['two roots', valid + valid, 'invalid-xml'],
  ['valid root then unfinished root', valid + '<message', 'invalid-xml'],
  ['valid root then junk', valid + 'junk', 'invalid-xml'],
  ['mismatched tags', '<message xmlns="jabber:client"><body></message>', 'invalid-xml'],
  ['depth over', deep(9), 'depth'],
  ['elements over', elements(33), 'elements'],
  ['attributes over', attributes(17), 'attributes'],
  ['attribute value over', `<message xmlns="jabber:client" a="${'x'.repeat(257)}"/>`, 'attribute-value'],
  ['attribute chars over', '<message xmlns="jabber:client" ' +
    Array.from({length: 4}, (_, i) => `a${i}="${'x'.repeat(256)}"`).join(' ') + '/>', 'attribute-chars'],
  ['oversized name', `<message xmlns="jabber:client"><${'x'.repeat(129)}/></message>`, 'name'],
  ['oversized attribute name', `<message xmlns="jabber:client" ${'x'.repeat(129)}="x"/>`, 'name'],
  ['oversized unfinished token', '<' + 'x'.repeat(4096), 'bytes'],
  ['UTF-8 bytes over with bounded units', message('🦉'.repeat(1100)), 'bytes'],
  ['binary buffer', new Uint8Array([60, 120, 47, 62]), 'text-required'],
  ['binary ArrayBuffer', new ArrayBuffer(4), 'text-required'],
  ['binary Blob', new Blob([valid]), 'text-required'],
  ['boxed string', new String(valid), 'text-required'],
  ['comment', '<!--x-->' + valid, 'restricted-xml'],
  ['DTD internal entity', '<!DOCTYPE message [<!ENTITY x "payload">]>' + message('&x;'), 'restricted-xml'],
  ['external DTD', '<!DOCTYPE message SYSTEM "https://example.invalid/dtd">' + valid, 'restricted-xml'],
  ['processing instruction', '<?test x?>' + valid, 'restricted-xml'],
  ['XML declaration', '<?xml version="1.0"?>' + valid, 'restricted-xml'],
  ['duplicate attribute', '<message xmlns="jabber:client" id="a" id="b"/>', 'invalid-xml'],
  ['duplicate expanded attribute', '<message xmlns="jabber:client" xmlns:a="urn:x" xmlns:b="urn:x" a:id="a" b:id="b"/>', 'invalid-xml'],
  ['unbound namespace', '<p:message/>', 'invalid-xml'],
  ['illegal namespace binding', '<message xmlns="jabber:client" xmlns:xml="urn:wrong"/>', 'invalid-xml'],
  ['unknown entity', message('&unknown;'), 'invalid-xml'],
  ['illegal control', message('\u0000'), 'invalid-xml'],
  ['unpaired surrogate', message('\ud800'), 'invalid-xml'],
  ['invalid char reference', message('&#0;'), 'invalid-xml'],
  ['unknown root', '<unknown xmlns="urn:fixture"/>', 'unknown-root']
];