const { accounts, contract } = require('@openzeppelin/test-environment');

const { BN, expectRevert } = require('@openzeppelin/test-helpers');

const { expect } = require('chai');

const ERC1155BurnableMock = contract.fromArtifact('ERC1155BurnableMock');

describe('ERC1155Burnable', function () {
  const [ holder, operator, other ] = accounts;

  const uri = 'https://token.com';

  const tokenIds = [new BN('42'), new BN('1137')];
  const amounts = [new BN('3000'), new BN('9902')];

  beforeEach(async function () {
    this.token = await ERC1155BurnableMock.new(uri);

    await this.token.mint(holder, tokenIds[0], amounts[0], '0x');
    await this.token.mint(holder, tokenIds[1], amounts[1], '0x');
  });

  describe('burn', function () {
    it('holder can burn their tokens', async function () {
      await this.token.burn(holder, tokenIds[0], amounts[0].subn(1), { from: holder });

      expect(await this.token.balanceOf(holder, tokenIds[0])).to.be.bignumber.equal('1');
    });

    it('approved operators can burn the holder\'s tokens', async function () {
      await this.token.setApprovalForAll(operator, true, { from: holder });
      await this.token.burn(holder, tokenIds[0], amounts[0].subn(1), { from: operator });

      expect(await this.token.balanceOf(holder, tokenIds[0])).to.be.bignumber.equal('1');
    });

    it('unapproved accounts cannot burn the holder\'s tokens', async function () {
      await expectRevert(
        this.token.burn(holder, tokenIds[0], amounts[0].subn(1), { from: other }),
        'ERC1155: caller is not owner nor approved'
      );
    });
  });

  describe('burnBatch', function () {
    it('holder can burn their tokens', async function () {
      await this.token.burnBatch(holder, tokenIds, [ amounts[0].subn(1), amounts[1].subn(2) ], { from: holder });

      expect(await this.token.balanceOf(holder, tokenIds[0])).to.be.bignumber.equal('1');
      expect(await this.token.balanceOf(holder, tokenIds[1])).to.be.bignumber.equal('2');
    });

    it('approved operators can burn the holder\'s tokens', async function () {
      await this.token.setApprovalForAll(operator, true, { from: holder });
      await this.token.burnBatch(holder, tokenIds, [ amounts[0].subn(1), amounts[1].subn(2) ], { from: operator });

      expect(await this.token.balanceOf(holder, tokenIds[0])).to.be.bignumber.equal('1');
      expect(await this.token.balanceOf(holder, tokenIds[1])).to.be.bignumber.equal('2');
    });

    it('unapproved accounts cannot burn the holder\'s tokens', async function () {
      await expectRevert(
        this.token.burnBatch(holder, tokenIds, [ amounts[0].subn(1), amounts[1].subn(2) ], { from: other }),
        'ERC1155: caller is not owner nor approved'
      );
    });
  });
});
