import Decimal from 'decimal.js';
import { Buffer } from "buffer";

export function d(value?: Decimal.Value): Decimal.Instance {
  if (Decimal.isDecimal(value)) {
    return value as Decimal;
  }
  return new Decimal(value === undefined ? 0 : value);
}

export function decimalsMultiplier(decimals?: Decimal.Value): Decimal.Instance {
  return d(10).pow(d(decimals).abs());
}

const HEX_REGEXP = /^[-+]?[0-9A-Fa-f]+\.?[0-9A-Fa-f]*?$/;

export function checkAddress(
  address: any,
  options: { leadingZero: boolean } = { leadingZero: true },
): boolean {
  if (typeof address !== 'string') {
    return false;
  }
  let str = address;

  if (options.leadingZero) {
    if (!address.startsWith('0x')) {
      return false;
    } else {
      str = str.substring(2);
    }
  }

  return HEX_REGEXP.test(str);
}

export function checkAptosType(
  type: any,
  options: { leadingZero: boolean } = { leadingZero: true },
): boolean {
  if (typeof type !== 'string') {
    return false;
  }

  let _type = type.replace(/\s/g, '');

  const openBracketsCount = _type.match(/</g)?.length ?? 0;
  const closeBracketsCount = _type.match(/>/g)?.length ?? 0;

  if (openBracketsCount !== closeBracketsCount) {
    return false;
  }

  const genericsString = _type.match(/(<.+>)$/);
  const generics = genericsString?.[1]?.match(
    /(\w+::\w+::\w+)(?:<.*?>(?!>))?/g,
  );

  if (generics) {
    _type = _type.slice(0, _type.indexOf('<'));
    const validGenerics = generics.every((g) => {
      const gOpenCount = g.match(/</g)?.length ?? 0;
      const gCloseCount = g.match(/>/g)?.length ?? 0;
      let t = g;
      if (gOpenCount !== gCloseCount) {
        t = t.slice(0, -(gCloseCount - gOpenCount));
      }

      return checkAptosType(t, options);
    });

    if (!validGenerics) {
      return false;
    }
  }

  const parts = _type.split('::');
  if (parts.length !== 3) {
    return false;
  }

  return (
    checkAddress(parts[0], options) &&
    parts[1].length >= 1 &&
    parts[2].length >= 1
  );
}

const EQUAL = 0;
const LESS_THAN = 1;
const GREATER_THAN = 2;

function cmp(a: number, b: number) {
  if (a === b) {
    return EQUAL;
  } else if (a < b) {
    return LESS_THAN;
  } else {
    return GREATER_THAN;
  }
}

function compare(symbolX: string, symbolY: string) {
  const lenCmp = cmp(symbolX.length, symbolY.length);
  if (lenCmp != EQUAL) {
    return lenCmp;
  }
  let i = 0;
  while (i < symbolX.length && i < symbolY.length) {
    const elem_cmp = cmp(symbolX.charCodeAt(i), symbolY.charCodeAt(i));
    if (elem_cmp != EQUAL) return elem_cmp;
    i++;
  }
  return EQUAL;
}

function cmp_addresses(a: string, b: string) {
  if (a.startsWith('0x')) {
    a = a.substring(2);
  }

  if (a.length != 64) {
    while (a.length < 64) {
      a = '0' + a;
    }
  }

  if (b.startsWith('0x')) {
    b = b.substring(2);
  }

  if (b.length != 64) {
    while (b.length < 64) {
      b = '0' + b;
    }
  }

  const a_buf = Buffer.from(a, 'hex');
  const b_buf = Buffer.from(b, 'hex');

  for (let i = 0; i < 32; i++) {
    if (a_buf[i] < b_buf[i]) {
      return LESS_THAN;
    } else if (a_buf[i] > b_buf[i]) {
      return GREATER_THAN;
    }
  }

  return EQUAL;
}

function compare_types(coin_x: string, coin_y: string) {
  const coin_x_parts = coin_x.split('::').reverse();
  const coin_y_parts = coin_y.split('::').reverse();

  const coin_x_address = coin_x_parts.pop() as string;
  const coin_y_address = coin_y_parts.pop() as string;

  for (let i = 0; i < 2; i++) {
    const c = compare(coin_x_parts[i], coin_y_parts[i]);
    if (c != EQUAL) {
      return c;
    }
  }

  return cmp_addresses(coin_x_address, coin_y_address);
}
/**
 * Compare sorting between two coin types
 *
 * @param coin_x string with full address of coin
 * @param coin_y string with full address of coin
 * @returns boolean
 */
export function is_sorted(coin_x: string, coin_y: string) {
  return compare_types(coin_x, coin_y) == LESS_THAN;
}

export const splitValue = (value: string) => {
  const spiltValue_ = String(value).split('.');
  const decimalLength = spiltValue_[1] && spiltValue_[1].length;
  return {
    spiltValue_,
    lastIndex: Number(decimalLength) - 1,
  };
};

export function camelCaseKeysToUnderscore(obj: any) {
  if (typeof obj !== 'object') {
    return obj;
  }

  for (const oldName in obj) {
    // Camel to underscore
    const newName = oldName.replace(/([A-Z])/g, function ($1) {
      return '_' + $1.toLowerCase();
    });

    // Only process if names are different
    if (newName != oldName) {
      // Check for the old property name to avoid a ReferenceError in strict mode.
      // eslint-disable-next-line
      if (obj.hasOwnProperty(oldName)) {
        obj[newName] = obj[oldName];
        delete obj[oldName];
      }
    }

    // Recursion
    if (typeof obj[newName] == 'object') {
      obj[newName] = camelCaseKeysToUnderscore(obj[newName]);
    }
  }
  return obj;
}

export function getFormattedValidationCode(error: Error) {
  return JSON.parse(error.message)
    .message.split('Validation Code:')
    .pop()
    .split('_')
    .join(' ')
    .toLowerCase();
}

// eslint-disable-next-line @typescript-eslint/no-empty-function
export function nope() {}