// Copyright 2022 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import { DefaultTestFileLoader } from '../third_party/webgpu-cts/src/common/internal/file_loader.js';
import { prettyPrintLog } from '../third_party/webgpu-cts/src/common/internal/logging/log_message.js';
import { Logger } from '../third_party/webgpu-cts/src/common/internal/logging/logger.js';
import { parseQuery } from '../third_party/webgpu-cts/src/common/internal/query/parseQuery.js';

import { TestWorker } from '../third_party/webgpu-cts/src/common/runtime/helper/test_worker.js';

// The Python-side websockets library has a max payload size of 72638. Set the
// max allowable logs size in a single payload to a bit less than that.
const LOGS_MAX_BYTES = 72000;

var socket;

function byteSize(s) {
  return new Blob([s]).size;
}

async function setupWebsocket(port) {
  socket = new WebSocket('ws://127.0.0.1:' + port)
  socket.addEventListener('message', runCtsTestViaSocket);
}

async function runCtsTestViaSocket(event) {
  let input = JSON.parse(event.data);
  runCtsTest(input['q'], input['w']);
}

async function runCtsTest(query, use_worker) {
  const workerEnabled = use_worker;
  const worker = workerEnabled ? new TestWorker(false) : undefined;

  const loader = new DefaultTestFileLoader();
  const filterQuery = parseQuery(query);
  const testcases = await loader.loadCases(filterQuery);

  const expectations = [];

  const log = new Logger();

  for (const testcase of testcases) {
    const name = testcase.query.toString();

    const wpt_fn = async () => {
      sendMessageTestStarted();
      const [rec, res] = log.record(name);
      if (worker) {
        await worker.run(rec, name, expectations);
      } else {
        await testcase.run(rec, expectations);
      }

      sendMessageTestStatus(res.status, res.timems);

      let fullLogs = (res.logs ?? []).map(prettyPrintLog);
      fullLogs = fullLogs.join('\n\n\n');
      let logPieces = splitLogsForPayload(fullLogs);
      sendMessageTestLog(logPieces);
      sendMessageTestFinished();
    };
    await wpt_fn();
  }
}

function splitLogsForPayload(fullLogs) {
  let logPieces = [fullLogs]
  // Split the log pieces until they all are guaranteed to fit into a
  // websocket payload.
  while (true) {
    let tempLogPieces = []
    for (const piece of logPieces) {
      if (byteSize(piece) > LOGS_MAX_BYTES) {
        let midpoint = Math.floor(piece.length / 2);
        tempLogPieces.push(piece.substring(0, midpoint));
        tempLogPieces.push(piece.substring(midpoint));
      } else {
        tempLogPieces.push(piece)
      }
    }
    // Didn't make any changes - all pieces are under the size limit.
    if (logPieces.every((value, index) => value == tempLogPieces[index])) {
      break;
    }
    logPieces = tempLogPieces;
  }
  return logPieces
}

function sendMessageTestStarted() {
  socket.send(JSON.stringify({'type': 'TEST_STARTED'}));
}

function sendMessageTestStatus(status, jsDurationMs) {
  socket.send(JSON.stringify({'type': 'TEST_STATUS',
                              'status': status,
                              'js_duration_ms': jsDurationMs}));
}

function sendMessageTestLog(logPieces) {
  logPieces.forEach((piece) => {
    socket.send(JSON.stringify({'type': 'TEST_LOG',
                                'log': piece}));
  });
}

function sendMessageTestFinished() {
  socket.send(JSON.stringify({'type': 'TEST_FINISHED'}));
}

window.runCtsTest = runCtsTest;
window.setupWebsocket = setupWebsocket