// Copyright 2024 The Pigweed 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
//
//     https://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 { WebSocketRPCReplKernel, WebSocketRPCClient } from './repl-kernel';
import { createLogViewer } from './createLogViewer';
import { LogSource } from './log-source';
import { Severity } from './shared/interfaces';
import { Repl } from './components/repl/repl';

const logLevelToSeverity = {
  10: Severity.DEBUG,
  20: Severity.INFO,
  21: Severity.INFO,
  30: Severity.WARNING,
  40: Severity.ERROR,
  50: Severity.CRITICAL,
  70: Severity.CRITICAL,
};

const nonAdditionalDataFields = [
  '_hosttime',
  'levelname',
  'levelno',
  'args',
  'fields',
  'message',
  'time',
];

// Format a date in the standard pw_cli style YYYY-mm-dd HH:MM:SS
function formatDate(dt: Date) {
  function pad2(n: number) {
    return (n < 10 ? '0' : '') + n;
  }

  return (
    dt.getFullYear() +
    pad2(dt.getMonth() + 1) +
    pad2(dt.getDate()) +
    ' ' +
    pad2(dt.getHours()) +
    ':' +
    pad2(dt.getMinutes()) +
    ':' +
    pad2(dt.getSeconds())
  );
}

// New LogSource to consume pw-console log json messages
class PwConsoleLogSource extends LogSource {
  // @ts-ignore
  appendLog(data) {
    const fields = [
      // @ts-ignore
      { key: 'severity', value: logLevelToSeverity[data.levelno] },
      { key: 'time', value: data.time },
    ];
    Object.keys(data.fields || {}).forEach((columnName) => {
      if (nonAdditionalDataFields.indexOf(columnName) === -1) {
        fields.push({ key: columnName, value: data.fields[columnName] });
      }
    });
    fields.push({ key: 'message', value: data.message });
    fields.push({ key: 'py_file', value: data.py_file });
    fields.push({ key: 'py_logger', value: data.py_logger });
    this.publishLogEntry({
      // @ts-ignore
      severity: logLevelToSeverity[data.levelno],
      timestamp: new Date(),
      fields: fields,
    });
  }
}

export async function renderPWConsole(containerEl: HTMLElement, wsUrl = '/ws') {
  const replContainerEl = document.createElement('div');
  replContainerEl.id = 'repl-container';
  const logsContainerEl = document.createElement('div');
  logsContainerEl.id = 'logs-container';
  createSplitPanel(replContainerEl, logsContainerEl, containerEl, 40);

  const ws = new WebSocket(wsUrl);
  const kernel = new WebSocketRPCClient(ws);
  const allLogSourceNames: string[] = await kernel.call('log_source_list', {
    filter: '',
  });
  const logSources = allLogSourceNames.map(
    (name) => new PwConsoleLogSource(name),
  );
  logSources.forEach((source, index) => {
    kernel.openStream(
      'log_source_subscribe',
      { name: allLogSourceNames[index] },
      (data) => {
        if (data.log_line)
          source.appendLog({ ...data.log_line, time: formatDate(new Date()) });
      },
    );
  });

  const unsubscribe = createLogViewer(logSources, logsContainerEl);

  const rpc = new WebSocketRPCReplKernel(kernel);
  const repl = new Repl(rpc, 'Python Shell');
  replContainerEl.appendChild(repl);
  (window as any).rpc = rpc;
  const resizeObserver = new ResizeObserver((entries) => {
    for (const entry of entries) {
      const splitPanel = document.querySelector('sl-split-panel');
      if (splitPanel) {
        // Stack vertically for smaller viewport sizes
        splitPanel.vertical = entry.contentRect.width < 800;
      }
    }
  });
  resizeObserver.observe(document.body);
  return () => {
    unsubscribe();
  };
}

export function createSplitPanel(
  startEl: HTMLElement,
  endEl: HTMLElement,
  containerEl: HTMLElement,
  initialPosition = 50,
) {
  const splitPanel = document.createElement('sl-split-panel');

  startEl.setAttribute('slot', 'start');
  endEl.setAttribute('slot', 'end');
  splitPanel.setAttribute('position', `${initialPosition}`);

  splitPanel.appendChild(startEl);
  splitPanel.appendChild(endEl);
  containerEl.appendChild(splitPanel);
}