import buffers from './testing/test-buffers';
import BufferList from './testing/buffer-list';
import { parse } from '.';
import assert from 'assert';
import { PassThrough } from 'stream';
import { BackendMessage } from './messages';

var authOkBuffer = buffers.authenticationOk();
var paramStatusBuffer = buffers.parameterStatus('client_encoding', 'UTF8');
var readyForQueryBuffer = buffers.readyForQuery();
var backendKeyDataBuffer = buffers.backendKeyData(1, 2);
var commandCompleteBuffer = buffers.commandComplete('SELECT 3');
var parseCompleteBuffer = buffers.parseComplete();
var bindCompleteBuffer = buffers.bindComplete();
var portalSuspendedBuffer = buffers.portalSuspended();

var addRow = function (bufferList: BufferList, name: string, offset: number) {
  return bufferList
    .addCString(name) // field name
    .addInt32(offset++) // table id
    .addInt16(offset++) // attribute of column number
    .addInt32(offset++) // objectId of field's data type
    .addInt16(offset++) // datatype size
    .addInt32(offset++) // type modifier
    .addInt16(0); // format code, 0 => text
};

var row1 = {
  name: 'id',
  tableID: 1,
  attributeNumber: 2,
  dataTypeID: 3,
  dataTypeSize: 4,
  typeModifier: 5,
  formatCode: 0,
};
var oneRowDescBuff = buffers.rowDescription([row1]);
row1.name = 'bang';

var twoRowBuf = buffers.rowDescription([
  row1,
  {
    name: 'whoah',
    tableID: 10,
    attributeNumber: 11,
    dataTypeID: 12,
    dataTypeSize: 13,
    typeModifier: 14,
    formatCode: 0,
  },
]);

var emptyRowFieldBuf = new BufferList().addInt16(0).join(true, 'D');

var emptyRowFieldBuf = buffers.dataRow([]);

var oneFieldBuf = new BufferList()
  .addInt16(1) // number of fields
  .addInt32(5) // length of bytes of fields
  .addCString('test')
  .join(true, 'D');

var oneFieldBuf = buffers.dataRow(['test']);

var expectedAuthenticationOkayMessage = {
  name: 'authenticationOk',
  length: 8,
};

var expectedParameterStatusMessage = {
  name: 'parameterStatus',
  parameterName: 'client_encoding',
  parameterValue: 'UTF8',
  length: 25,
};

var expectedBackendKeyDataMessage = {
  name: 'backendKeyData',
  processID: 1,
  secretKey: 2,
};

var expectedReadyForQueryMessage = {
  name: 'readyForQuery',
  length: 5,
  status: 'I',
};

var expectedCommandCompleteMessage = {
  name: 'commandComplete',
  length: 13,
  text: 'SELECT 3',
};
var emptyRowDescriptionBuffer = new BufferList()
  .addInt16(0) // number of fields
  .join(true, 'T');

var expectedEmptyRowDescriptionMessage = {
  name: 'rowDescription',
  length: 6,
  fieldCount: 0,
  fields: [],
};
var expectedOneRowMessage = {
  name: 'rowDescription',
  length: 27,
  fieldCount: 1,
  fields: [
    {
      name: 'id',
      tableID: 1,
      columnID: 2,
      dataTypeID: 3,
      dataTypeSize: 4,
      dataTypeModifier: 5,
      format: 'text',
    },
  ],
};

var expectedTwoRowMessage = {
  name: 'rowDescription',
  length: 53,
  fieldCount: 2,
  fields: [
    {
      name: 'bang',
      tableID: 1,
      columnID: 2,
      dataTypeID: 3,
      dataTypeSize: 4,
      dataTypeModifier: 5,
      format: 'text',
    },
    {
      name: 'whoah',
      tableID: 10,
      columnID: 11,
      dataTypeID: 12,
      dataTypeSize: 13,
      dataTypeModifier: 14,
      format: 'text',
    },
  ],
};

var testForMessage = function (buffer: Buffer, expectedMessage: any) {
  it('recieves and parses ' + expectedMessage.name, async () => {
    const messages = await parseBuffers([buffer]);
    const [lastMessage] = messages;

    for (const key in expectedMessage) {
      assert.deepEqual((lastMessage as any)[key], expectedMessage[key]);
    }
  });
};

var plainPasswordBuffer = buffers.authenticationCleartextPassword();
var md5PasswordBuffer = buffers.authenticationMD5Password();
var SASLBuffer = buffers.authenticationSASL();
var SASLContinueBuffer = buffers.authenticationSASLContinue();
var SASLFinalBuffer = buffers.authenticationSASLFinal();

var expectedPlainPasswordMessage = {
  name: 'authenticationCleartextPassword',
};

var expectedMD5PasswordMessage = {
  name: 'authenticationMD5Password',
  salt: Buffer.from([1, 2, 3, 4]),
};

var expectedSASLMessage = {
  name: 'authenticationSASL',
  mechanisms: ['SCRAM-SHA-256'],
};

var expectedSASLContinueMessage = {
  name: 'authenticationSASLContinue',
  data: 'data',
};

var expectedSASLFinalMessage = {
  name: 'authenticationSASLFinal',
  data: 'data',
};

var notificationResponseBuffer = buffers.notification(4, 'hi', 'boom');
var expectedNotificationResponseMessage = {
  name: 'notification',
  processId: 4,
  channel: 'hi',
  payload: 'boom',
};

const parseBuffers = async (buffers: Buffer[]): Promise<BackendMessage[]> => {
  const stream = new PassThrough();
  for (const buffer of buffers) {
    stream.write(buffer);
  }
  stream.end();
  const msgs: BackendMessage[] = [];
  await parse(stream, (msg) => msgs.push(msg));
  return msgs;
};

describe('PgPacketStream', function () {
  testForMessage(authOkBuffer, expectedAuthenticationOkayMessage);
  testForMessage(plainPasswordBuffer, expectedPlainPasswordMessage);
  testForMessage(md5PasswordBuffer, expectedMD5PasswordMessage);
  testForMessage(SASLBuffer, expectedSASLMessage);
  testForMessage(SASLContinueBuffer, expectedSASLContinueMessage);
  testForMessage(SASLFinalBuffer, expectedSASLFinalMessage);

  testForMessage(paramStatusBuffer, expectedParameterStatusMessage);
  testForMessage(backendKeyDataBuffer, expectedBackendKeyDataMessage);
  testForMessage(readyForQueryBuffer, expectedReadyForQueryMessage);
  testForMessage(commandCompleteBuffer, expectedCommandCompleteMessage);
  testForMessage(notificationResponseBuffer, expectedNotificationResponseMessage);
  testForMessage(buffers.emptyQuery(), {
    name: 'emptyQuery',
    length: 4,
  });

  testForMessage(Buffer.from([0x6e, 0, 0, 0, 4]), {
    name: 'noData',
  });

  describe('rowDescription messages', function () {
    testForMessage(emptyRowDescriptionBuffer, expectedEmptyRowDescriptionMessage);
    testForMessage(oneRowDescBuff, expectedOneRowMessage);
    testForMessage(twoRowBuf, expectedTwoRowMessage);
  });

  describe('parsing rows', function () {
    describe('parsing empty row', function () {
      testForMessage(emptyRowFieldBuf, {
        name: 'dataRow',
        fieldCount: 0,
      });
    });

    describe('parsing data row with fields', function () {
      testForMessage(oneFieldBuf, {
        name: 'dataRow',
        fieldCount: 1,
        fields: ['test'],
      });
    });
  });

  describe('notice message', function () {
    // this uses the same logic as error message
    var buff = buffers.notice([{ type: 'C', value: 'code' }]);
    testForMessage(buff, {
      name: 'notice',
      code: 'code',
    });
  });

  testForMessage(buffers.error([]), {
    name: 'error',
  });

  describe('with all the fields', function () {
    var buffer = buffers.error([
      {
        type: 'S',
        value: 'ERROR',
      },
      {
        type: 'C',
        value: 'code',
      },
      {
        type: 'M',
        value: 'message',
      },
      {
        type: 'D',
        value: 'details',
      },
      {
        type: 'H',
        value: 'hint',
      },
      {
        type: 'P',
        value: '100',
      },
      {
        type: 'p',
        value: '101',
      },
      {
        type: 'q',
        value: 'query',
      },
      {
        type: 'W',
        value: 'where',
      },
      {
        type: 'F',
        value: 'file',
      },
      {
        type: 'L',
        value: 'line',
      },
      {
        type: 'R',
        value: 'routine',
      },
      {
        type: 'Z', // ignored
        value: 'alsdkf',
      },
    ]);

    testForMessage(buffer, {
      name: 'error',
      severity: 'ERROR',
      code: 'code',
      message: 'message',
      detail: 'details',
      hint: 'hint',
      position: '100',
      internalPosition: '101',
      internalQuery: 'query',
      where: 'where',
      file: 'file',
      line: 'line',
      routine: 'routine',
    });
  });

  testForMessage(parseCompleteBuffer, {
    name: 'parseComplete',
  });

  testForMessage(bindCompleteBuffer, {
    name: 'bindComplete',
  });

  testForMessage(bindCompleteBuffer, {
    name: 'bindComplete',
  });

  testForMessage(buffers.closeComplete(), {
    name: 'closeComplete',
  });

  describe('parses portal suspended message', function () {
    testForMessage(portalSuspendedBuffer, {
      name: 'portalSuspended',
    });
  });

  describe('parses replication start message', function () {
    testForMessage(Buffer.from([0x57, 0x00, 0x00, 0x00, 0x04]), {
      name: 'replicationStart',
      length: 4,
    });
  });

  describe('copy', () => {
    testForMessage(buffers.copyIn(0), {
      name: 'copyInResponse',
      length: 7,
      binary: false,
      columnTypes: [],
    });

    testForMessage(buffers.copyIn(2), {
      name: 'copyInResponse',
      length: 11,
      binary: false,
      columnTypes: [0, 1],
    });

    testForMessage(buffers.copyOut(0), {
      name: 'copyOutResponse',
      length: 7,
      binary: false,
      columnTypes: [],
    });

    testForMessage(buffers.copyOut(3), {
      name: 'copyOutResponse',
      length: 13,
      binary: false,
      columnTypes: [0, 1, 2],
    });

    testForMessage(buffers.copyDone(), {
      name: 'copyDone',
      length: 4,
    });

    testForMessage(buffers.copyData(Buffer.from([5, 6, 7])), {
      name: 'copyData',
      length: 7,
      chunk: Buffer.from([5, 6, 7]),
    });
  });

  // since the data message on a stream can randomly divide the incomming
  // tcp packets anywhere, we need to make sure we can parse every single
  // split on a tcp message
  describe('split buffer, single message parsing', function () {
    var fullBuffer = buffers.dataRow([null, 'bang', 'zug zug', null, '!']);

    it('parses when full buffer comes in', async function () {
      const messages = await parseBuffers([fullBuffer]);
      const message = messages[0] as any;
      assert.equal(message.fields.length, 5);
      assert.equal(message.fields[0], null);
      assert.equal(message.fields[1], 'bang');
      assert.equal(message.fields[2], 'zug zug');
      assert.equal(message.fields[3], null);
      assert.equal(message.fields[4], '!');
    });

    var testMessageRecievedAfterSpiltAt = async function (split: number) {
      var firstBuffer = Buffer.alloc(fullBuffer.length - split);
      var secondBuffer = Buffer.alloc(fullBuffer.length - firstBuffer.length);
      fullBuffer.copy(firstBuffer, 0, 0);
      fullBuffer.copy(secondBuffer, 0, firstBuffer.length);
      const messages = await parseBuffers([fullBuffer]);
      const message = messages[0] as any;
      assert.equal(message.fields.length, 5);
      assert.equal(message.fields[0], null);
      assert.equal(message.fields[1], 'bang');
      assert.equal(message.fields[2], 'zug zug');
      assert.equal(message.fields[3], null);
      assert.equal(message.fields[4], '!');
    };

    it('parses when split in the middle', function () {
      testMessageRecievedAfterSpiltAt(6);
    });

    it('parses when split at end', function () {
      testMessageRecievedAfterSpiltAt(2);
    });

    it('parses when split at beginning', function () {
      testMessageRecievedAfterSpiltAt(fullBuffer.length - 2);
      testMessageRecievedAfterSpiltAt(fullBuffer.length - 1);
      testMessageRecievedAfterSpiltAt(fullBuffer.length - 5);
    });
  });

  describe('split buffer, multiple message parsing', function () {
    var dataRowBuffer = buffers.dataRow(['!']);
    var readyForQueryBuffer = buffers.readyForQuery();
    var fullBuffer = Buffer.alloc(dataRowBuffer.length + readyForQueryBuffer.length);
    dataRowBuffer.copy(fullBuffer, 0, 0);
    readyForQueryBuffer.copy(fullBuffer, dataRowBuffer.length, 0);

    var verifyMessages = function (messages: any[]) {
      assert.strictEqual(messages.length, 2);
      assert.deepEqual(messages[0], {
        name: 'dataRow',
        fieldCount: 1,
        length: 11,
        fields: ['!'],
      });
      assert.equal(messages[0].fields[0], '!');
      assert.deepEqual(messages[1], {
        name: 'readyForQuery',
        length: 5,
        status: 'I',
      });
    };
    // sanity check
    it('recieves both messages when packet is not split', async function () {
      const messages = await parseBuffers([fullBuffer]);
      verifyMessages(messages);
    });

    var splitAndVerifyTwoMessages = async function (split: number) {
      var firstBuffer = Buffer.alloc(fullBuffer.length - split);
      var secondBuffer = Buffer.alloc(fullBuffer.length - firstBuffer.length);
      fullBuffer.copy(firstBuffer, 0, 0);
      fullBuffer.copy(secondBuffer, 0, firstBuffer.length);
      const messages = await parseBuffers([firstBuffer, secondBuffer]);
      verifyMessages(messages);
    };

    describe('recieves both messages when packet is split', function () {
      it('in the middle', function () {
        return splitAndVerifyTwoMessages(11);
      });
      it('at the front', function () {
        return Promise.all([
          splitAndVerifyTwoMessages(fullBuffer.length - 1),
          splitAndVerifyTwoMessages(fullBuffer.length - 4),
          splitAndVerifyTwoMessages(fullBuffer.length - 6),
        ]);
      });

      it('at the end', function () {
        return Promise.all([splitAndVerifyTwoMessages(8), splitAndVerifyTwoMessages(1)]);
      });
    });
  });
});