import { test, testDeep, testThrows, summary } from './helpers.js';

console.log('String Tests\n');

let str = 'hello world';
test('indexOf found', str.indexOf('world'), 6);
test('indexOf first occurrence', str.indexOf('o'), 4);
test('indexOf not found', str.indexOf('xyz'), -1);
test('indexOf empty string', str.indexOf(''), 0);
test('indexOf UTF-16 offset', 'a𝄞bé𝄞'.indexOf('𝄞'), 1);
test('indexOf UTF-16 start', 'a𝄞bé𝄞'.indexOf('𝄞', 2), 5);
test('indexOf non-ASCII prefix', 'éa'.indexOf('a'), 1);
test('indexOf embedded NUL', 'a\0b\0c'.indexOf('\0b'), 1);
test('indexOf coerces numeric search', 'a12b'.indexOf(12), 1);
test('indexOf missing search is undefined', 'xundefinedy'.indexOf(), 1);
test('indexOf coerces string position', 'abcabc'.indexOf('b', '2'), 4);
test('indexOf truncates fractional position', 'abcabc'.indexOf('b', 1.9), 1);
test('indexOf NaN position is zero', 'abc'.indexOf('a', NaN), 0);
test('indexOf positive infinity clamps high', 'abc'.indexOf('', Infinity), 3);
test('indexOf negative infinity clamps low', 'abc'.indexOf('a', -Infinity), 0);
test('indexOf leading surrogate', '𝄞'.indexOf('\uD834'), 0);
test('indexOf trailing surrogate', '𝄞'.indexOf('\uDD1E'), 1);
test('indexOf long Unicode first-unit mismatch', 'é'.repeat(100000).indexOf('x'.repeat(10000)), -1);
test('indexOf Unicode match after rejected candidates', 'é'.repeat(1000).concat('xyz').indexOf('xyz'), 1000);
test('indexOf trailing surrogate and suffix', 'é𝄞x'.indexOf('\uDD1Ex'), 2);

let js = 'JavaScript';
test('substring start end', js.substring(0, 4), 'Java');
test('substring start only', js.substring(4), 'Script');
test('substring swaps if end < start', js.substring(10, 4), 'Script');
test('substring astral leading surrogate', '𝄞'.substring(0, 1), '\uD834');
test('substring astral trailing surrogate', '𝄞'.substring(1, 2), '\uDD1E');
test('substring coerces string indexes', 'abcdef'.substring('2', '4'), 'cd');
test('substring truncates fractional indexes', 'abcdef'.substring(1.9, 4.9), 'bcd');
test('substring NaN start is zero', 'abcdef'.substring(NaN, 2), 'ab');
test('substring undefined end uses length', 'abcdef'.substring(2, undefined), 'cdef');
test('substring infinities clamp', 'abcdef'.substring(Infinity, -Infinity), 'abcdef');

let intrinsicOrder = [];
let intrinsicReceiver = {
  indexOf: String.prototype.indexOf,
  substring: String.prototype.substring,
  toString() {
    intrinsicOrder.push('receiver');
    return 'abcabc';
  }
};
let intrinsicSearch = {
  toString() {
    intrinsicOrder.push('search');
    return 'b';
  }
};
let intrinsicPosition = {
  valueOf() {
    intrinsicOrder.push('position');
    return 2;
  }
};
test('indexOf intrinsic coerces receiver/search/position', intrinsicReceiver.indexOf(intrinsicSearch, intrinsicPosition), 4);
testDeep('indexOf intrinsic coercion order', intrinsicOrder, ['receiver', 'search', 'position']);

let substringOrder = [];
let substringReceiver = {
  substring: String.prototype.substring,
  toString() {
    substringOrder.push('receiver');
    return 'abcdef';
  }
};
let substringStart = {
  valueOf() {
    substringOrder.push('start');
    return 1;
  }
};
let substringEnd = {
  valueOf() {
    substringOrder.push('end');
    return 3;
  }
};
test('substring intrinsic coerces indexes', substringReceiver.substring(substringStart, substringEnd), 'bc');
testDeep('substring intrinsic coercion order', substringOrder, ['receiver', 'start', 'end']);

function hotStringCalls(value) {
  return value.indexOf('/') + value.substring(0, 1).charCodeAt(0);
}
let hotStringResult = 0;
for (let i = 0; i < 300; i++) hotStringResult = hotStringCalls('/path');
test('hot string intrinsic result', hotStringResult, 47);

function jitIndexOf(receiver, search, position) {
  return receiver.indexOf(search, position);
}
for (let i = 0; i < 300; i++) jitIndexOf('abcabc', 'b', 0);
function growIntrinsicStack(depth) {
  if (depth === 0) return 0;
  return 1 + growIntrinsicStack(depth - 1);
}
const relocatingSearch = {
  toString() {
    growIntrinsicStack(300);
    const ballast = [];
    for (let i = 0; i < 2_000; i++) ballast.push({ value: i });
    if (ballast.length !== 2_000) throw new Error('allocation failed');
    return 'b';
  }
};
test('JIT string intrinsic snapshots args across stack growth', jitIndexOf('abcabc', relocatingSearch, 2), 4);

const savedIndexOf = String.prototype.indexOf;
String.prototype.indexOf = function () { return 77; };
test('indexOf intrinsic observes overridden builtin', 'abc'.indexOf('b'), 77);
String.prototype.indexOf = savedIndexOf;

let customLookupCount = 0;
let customReceiver = {
  get indexOf() {
    customLookupCount++;
    return function (value) { return this.prefix + value; };
  },
  prefix: 'seen:'
};
test('indexOf intrinsic falls back to custom method', customReceiver.indexOf('x'), 'seen:x');
test('indexOf intrinsic observes custom getter once', customLookupCount, 1);
test('indexOf spelling on arrays falls back normally', [1, 2, 3].indexOf(2), 1);
test('optional string call short-circuits', null?.indexOf('x'), undefined);
testThrows('indexOf rejects null receiver', () => String.prototype.indexOf.call(null, 'x'));
testThrows('substring rejects undefined receiver', () => String.prototype.substring.call(undefined, 0));
testThrows('indexOf rejects Symbol search', () => 'abc'.indexOf(Symbol('x')));
testThrows('indexOf rejects BigInt position', () => 'abc'.indexOf('a', 0n));
testThrows('substring rejects Symbol start', () => 'abc'.substring(Symbol('x')));

let fox = 'The quick brown fox';
test('slice start end', fox.slice(0, 3), 'The');
test('slice start only', fox.slice(10), 'brown fox');
test('slice negative start', fox.slice(-3), 'fox');
test('slice negative end', fox.slice(0, -4), 'The quick brown');
test('slice astral leading surrogate', '𝄞'.slice(0, 1), '\uD834');
test('slice astral trailing surrogate', '𝄞'.slice(1, 2), '\uDD1E');
test('slice astral split boundaries', '𝄞x💙'.slice(1, 4), '\uDD1Ex\uD83D');
test('substr astral leading surrogate', '𝄞'.substr(0, 1), '\uD834');
test('substr astral trailing surrogate', '𝄞'.substr(1, 1), '\uDD1E');
test('substr coerces string start', 'abcdef'.substr('2', 3), 'cde');
test('substr coerces string length', 'abcdef'.substr(2, '3'), 'cde');
test('substr truncates negative fractional start', 'abcdef'.substr(-1.5), 'f');

let csv = 'apple,banana,cherry';
let parts = csv.split(',');
test('split length', parts.length, 3);
test('split first', parts[0], 'apple');
test('split last', parts[2], 'cherry');

let chars = 'hello'.split('');
test('split empty', chars.length, 5);
test('split empty first', chars[0], 'h');

test('includes true', 'quick brown fox'.includes('quick'), true);
test('includes false', 'quick brown fox'.includes('cat'), false);
test('includes empty', 'hello'.includes(''), true);

test('startsWith true', 'Hello, World!'.startsWith('Hello'), true);
test('startsWith false', 'Hello, World!'.startsWith('World'), false);
test('startsWith position true', 'Hello, World!'.startsWith('World', 7), true);
test('startsWith position false', 'Hello, World!'.startsWith('Hello', 1), false);
test('startsWith position clamps negative', 'Hello'.startsWith('Hello', -1), true);
test('startsWith position clamps past end for empty search', 'Hello'.startsWith('', 99), true);
test('startsWith position past end rejects non-empty search', 'Hello'.startsWith('H', 99), false);
test('startsWith Hono query fast path shape', 'http://localhost:18080/?q=hello'.startsWith('q', 24), true);
test('startsWith astral leading surrogate', '𝄞'.startsWith('\uD834'), true);
test('startsWith astral trailing surrogate', '𝄞'.startsWith('\uDD1E', 1), true);

test('endsWith true', 'index.html'.endsWith('.html'), true);
test('endsWith false', 'index.html'.endsWith('.js'), false);
test('endsWith end position true', 'index.html'.endsWith('index', 5), true);
test('endsWith end position false', 'index.html'.endsWith('.html', 5), false);
test('endsWith end position clamps negative for empty search', 'index.html'.endsWith('', -1), true);
test('endsWith end position clamps negative for non-empty search', 'index.html'.endsWith('i', -1), false);
test('endsWith astral leading surrogate', '𝄞'.endsWith('\uD834', 1), true);
test('endsWith astral trailing surrogate', '𝄞'.endsWith('\uDD1E'), true);

test('toUpperCase', 'hello'.toUpperCase(), 'HELLO');
test('toLowerCase', 'HELLO'.toLowerCase(), 'hello');

test('trim', '  hello  '.trim(), 'hello');
test('trimStart', '  hello'.trimStart(), 'hello');
test('trimEnd', 'hello  '.trimEnd(), 'hello');

test('padStart', '5'.padStart(3, '0'), '005');
test('padEnd', '5'.padEnd(3, '0'), '500');

test('repeat', 'ab'.repeat(3), 'ababab');

test('charAt', 'hello'.charAt(1), 'e');
test('charAt default index', 'hello'.charAt(), 'h');
test('charAt coercion', 'hello'.charAt('1'), 'e');
test('charCodeAt', 'ABC'.charCodeAt(0), 65);
test('charCodeAt default index', 'ABC'.charCodeAt(), 65);
test('charCodeAt coercion', 'ABC'.charCodeAt('1'), 66);
test('codePointAt ascii', 'ABC'.codePointAt(0), 65);
test('codePointAt default index', 'ABC'.codePointAt(), 65);
test('codePointAt coercion', 'ABC'.codePointAt('1'), 66);
test('codePointAt out of bounds', 'ABC'.codePointAt(10), undefined);
test('codePointAt utf8 2-byte', 'é'.codePointAt(0), 233);
test('codePointAt utf8 3-byte', '中'.codePointAt(0), 20013);
test('codePointAt utf8 4-byte', '😀'.codePointAt(0), 128512);
test('charAt astral leading surrogate', '💙'.charAt(0).charCodeAt(0), 0xD83D);
test('charAt astral trailing surrogate', '💙'.charAt(1).charCodeAt(0), 0xDC99);

test('replace', 'hello world'.replace('world', 'there'), 'hello there');
test('replaceAll', 'a-b-c'.replaceAll('-', '_'), 'a_b_c');

test(
  'template missing placeholders stay empty',
  'Hello, {{name}}. Missing: {{missing}}.'.template({ name: 'Ant' }),
  'Hello, Ant. Missing: .'
);
test(
  'template placeholder values use normal string coercion',
  '{{nil}}/{{undef}}/{{obj}}/{{arr}}/{{ok}}'.template({
    nil: null,
    undef: undefined,
    obj: { toString() { return 'custom'; } },
    arr: [1, 2],
    ok: false
  }),
  'null/undefined/custom/1,2/false'
);
test(
  'template unterminated placeholders remain literal',
  'before {{name after'.template({ name: 'ignored' }),
  'before {{name after'
);

testDeep('match', 'test123'.match(/\d+/), ['123']);

test('at positive', 'hello'.at(1), 'e');
test('at negative', 'hello'.at(-1), 'o');

test('length', 'hello'.length, 5);
test('bracket access', 'hello'[0], 'h');
test('bracket access astral leading surrogate', '💙'[0].charCodeAt(0), 0xD83D);
test('bracket access astral trailing surrogate', '💙'[1].charCodeAt(0), 0xDC99);

test('concat', 'hello'.concat(' ', 'world'), 'hello world');

test('lastIndexOf', 'hello world world'.lastIndexOf('world'), 12);
test('lastIndexOf utf16 result', 'abc🎈def🎈xyz'.lastIndexOf('🎈'), 8);
test('lastIndexOf utf16 position', 'abc🎈def🎈xyz'.lastIndexOf('🎈', 7), 3);
test('lastIndexOf utf16 position on match', 'abc🎈def🎈xyz'.lastIndexOf('🎈', 8), 8);
test('lastIndexOf astral search miss', 'abc🎈def'.lastIndexOf('💙'), -1);
test('lastIndexOf empty search utf16 clamp', 'ab🎈cd'.lastIndexOf(''), 6);
test('lastIndexOf empty search with position', 'ab🎈cd'.lastIndexOf('', 3), 3);
test('lastIndexOf mid-surrogate position floors', '𝔀b'.lastIndexOf('b', 1), -1);
test('lastIndexOf mid-surrogate keeps earlier match', '𝔀b'.lastIndexOf('𝔀', 1), 0);
test('lastIndexOf exact boundary after astral', '𝔀b'.lastIndexOf('b', 2), 2);
test('lastIndexOf empty search mid-surrogate not floored', '𝔀b'.lastIndexOf('', 1), 1);
test('lastIndexOf multibyte BMP boundary', 'éb'.lastIndexOf('b', 1), 1);

test('String.fromCharCode', String.fromCharCode(65, 66, 67), 'ABC');
test('String.raw tagged template', String.raw`line1\nline2`, 'line1\\nline2');
test('String.raw substitutions', String.raw({ raw: ['a', 'b', 'c'] }, 1, 2), 'a1b2c');

test('empty string length', ''.length, 0);
test('empty indexOf', ''.indexOf('x'), -1);
test('empty includes empty', ''.includes(''), true);
test('empty startsWith empty', ''.startsWith(''), true);

let nfc = '\u0041\u006d\u0065\u0301\u006c\u0069\u0065';
test('normalize default (NFC)', nfc.normalize(), 'Am\u00E9lie');
test('normalize NFC explicit', nfc.normalize('NFC'), 'Am\u00E9lie');

let composed = 'Am\u00E9lie';
test('normalize NFD', composed.normalize('NFD'), 'Ame\u0301lie');

test('normalize NFKC fi ligature', '\uFB01'.normalize('NFKC'), 'fi');
test('normalize NFKC fullwidth', '\uFF21'.normalize('NFKC'), 'A');

test('normalize NFKD fi ligature', '\uFB01'.normalize('NFKD'), 'fi');
test('normalize NFKD fullwidth', '\uFF21'.normalize('NFKD'), 'A');

test('normalize empty string', ''.normalize(), '');
test('normalize ascii passthrough', 'hello'.normalize(), 'hello');
test('normalize no arg same as NFC', '\u00E9'.normalize(), '\u00E9');

let template = `Value: ${1 + 2}`;
test('template literal', template, 'Value: 3');

let multi = `line1
line2`;
test('multiline template', multi.includes('\n'), true);

summary();