import { bs } from "../../../lib/as-bs";
import { JSON } from "../..";
import { BRACE_LEFT, BRACE_RIGHT, COLON, COMMA } from "../../custom/chars";

export function serializeMap<T extends Map<any, any>>(src: T): void {
  const srcSize = src.size;
  const srcEnd = srcSize - 1;

  if (srcSize == 0) {
    bs.proposeSize(4);
    store<u32>(bs.offset, 8192123);
    bs.offset += 4;
    return;
  }

  let keys = src.keys();
  let values = src.values();
  const keyIsString = isString<indexof<T>>();

  bs.proposeSize(4 + <u32>(srcSize - 1) * 2 + <u32>srcSize * 2);

  store<u16>(bs.offset, BRACE_LEFT);
  bs.offset += 2;

  for (let i = 0; i < srcEnd; i++) {
    if (keyIsString) {
      JSON.__serialize(unchecked(keys[i]));
    } else {
      JSON.__serialize<string>(
        JSON.internal.stringify<indexof<T>>(unchecked(keys[i])),
      );
    }
    store<u16>(bs.offset, COLON);
    bs.offset += 2;
    JSON.__serialize(unchecked(values[i]));
    store<u16>(bs.offset, COMMA);
    bs.offset += 2;
  }

  if (keyIsString) {
    JSON.__serialize(unchecked(keys[srcEnd]));
  } else {
    JSON.__serialize<string>(
      JSON.internal.stringify<indexof<T>>(unchecked(keys[srcEnd])),
    );
  }
  store<u16>(bs.offset, COLON);
  bs.offset += 2;

  JSON.__serialize(unchecked(values[srcEnd]));
  store<u16>(bs.offset, BRACE_RIGHT);
  bs.offset += 2;
}