import {
  Assert
} from '../walt/tests';
import { assert: Assert, memory: Memory<{ initial: 1 }> } from 'env';
import {
  getStringIterator,
  next,
  reset,
  stringLength,
  indexOf
} from '../walt/string';

import {
  // Type
  StringIterator
} from '../walt/string';

function countCharacter(ptr: i32, character: i32) : i32 {
  const iterator: StringIterator = getStringIterator(ptr);
  let result: i32 = 0;

  next(iterator);
  while(iterator.done == false) {
    if (iterator.value == character) {
      result += 1;
    }
    next(iterator);
  }

  return result;
}

export function run() {
  assert("string iterator, count ASCII", countCharacter("aabbccddaa   aaa", 'a'), 7);
  assert("string iterator, count emojis", countCharacter("aabb😂😂😂 aaa😂", '😂'), 4);
  assert("string iterator, indexOf ascii", indexOf("quick brown fox", "brown"), 6);
  assert(
    "string iterator, indexOf utf8",
    indexOf('Liberté, égalité, fraternité for all utf encodings!', 'égalité'),
    9
  );
  const text: i32 = "large string encoding --> We need to test that strings of length of 128+ bytes work. On a plane, so could not post lorem ipsum, this should be of correct length though. Unicode for coverage √";
  assert(text, stringLength(text), 191);
}