/**
 *  Copyright (c) 2021 GraphQL Contributors.
 *
 *  This source code is licensed under the MIT license found in the
 *  LICENSE file in the root directory of this source tree.
 */

import React from 'react';
import isEqual from 'lodash/isEqual';
import { getEnvironmentVariables } from 'utils/collections';
import { defineCodeMirrorBrunoVariablesMode } from 'utils/common/codemirror';
import StyledWrapper from './StyledWrapper';
import jsonlint from 'jsonlint';
import { JSHINT } from 'jshint';

let CodeMirror;
const SERVER_RENDERED = typeof navigator === 'undefined' || global['PREVENT_CODEMIRROR_RENDER'] === true;

if (!SERVER_RENDERED) {
  CodeMirror = require('codemirror');
  window.jsonlint = jsonlint;
  window.JSHINT = JSHINT;
  //This should be done dynamically if possible
  const hintWords = [
    'res',
    'res.status',
    'res.statusText',
    'res.headers',
    'res.body',
    'res.getStatus()',
    'res.getHeader(name)',
    'res.getHeaders()',
    'res.getBody()',
    'req',
    'req.url',
    'req.method',
    'req.headers',
    'req.body',
    'req.timeout',
    'req.getUrl()',
    'req.setUrl(url)',
    'req.getMethod()',
    'req.setMethod(method)',
    'req.getHeader(name)',
    'req.getHeaders()',
    'req.setHeader(name, value)',
    'req.setHeaders(data)',
    'req.getBody()',
    'req.setBody(data)',
    'req.setMaxRedirects(maxRedirects)',
    'req.getTimeout()',
    'req.setTimeout(timeout)',
    'bru',
    'bru.cwd()',
    'bru.getEnvName(key)',
    'bru.getProcessEnv(key)',
    'bru.getEnvVar(key)',
    'bru.setEnvVar(key,value)',
    'bru.getVar(key)',
    'bru.setVar(key,value)'
  ];
  CodeMirror.registerHelper('hint', 'brunoJS', (editor, options) => {
    const cursor = editor.getCursor();
    const currentLine = editor.getLine(cursor.line);
    let startBru = cursor.ch;
    let endBru = startBru;
    while (endBru < currentLine.length && /[\w.]/.test(currentLine.charAt(endBru))) ++endBru;
    while (startBru && /[\w.]/.test(currentLine.charAt(startBru - 1))) --startBru;
    let curWordBru = startBru != endBru && currentLine.slice(startBru, endBru);

    let start = cursor.ch;
    let end = start;
    while (end < currentLine.length && /[\w]/.test(currentLine.charAt(end))) ++end;
    while (start && /[\w]/.test(currentLine.charAt(start - 1))) --start;
    const jsHinter = CodeMirror.hint.javascript;
    let result = jsHinter(editor) || { list: [] };
    result.to = CodeMirror.Pos(cursor.line, end);
    result.from = CodeMirror.Pos(cursor.line, start);
    hintWords.forEach((h) => {
      if (h.includes('.') == curWordBru.includes('.') && h.startsWith(curWordBru)) {
        result.list.push(curWordBru.includes('.') ? h.split('.')[1] : h);
      }
    });
    result.list = result.list?.sort();
    return result;
  });
  CodeMirror.commands.autocomplete = (cm, hint, options) => {
    cm.showHint({ hint, ...options });
  };
}

export default class CodeEditor extends React.Component {
  constructor(props) {
    super(props);

    // Keep a cached version of the value, this cache will be updated when the
    // editor is updated, which can later be used to protect the editor from
    // unnecessary updates during the update lifecycle.
    this.cachedValue = props.value || '';
    this.variables = {};
  }

  componentDidMount() {
    const editor = (this.editor = CodeMirror(this._node, {
      value: this.props.value || '',
      lineNumbers: true,
      lineWrapping: true,
      tabSize: 2,
      mode: this.props.mode || 'application/ld+json',
      keyMap: 'sublime',
      autoCloseBrackets: true,
      matchBrackets: true,
      showCursorWhenSelecting: true,
      foldGutter: true,
      gutters: ['CodeMirror-linenumbers', 'CodeMirror-foldgutter', 'CodeMirror-lint-markers'],
      lint: {
        esversion: 11
      },
      readOnly: this.props.readOnly,
      scrollbarStyle: 'overlay',
      theme: this.props.theme === 'dark' ? 'monokai' : 'default',
      extraKeys: {
        'Cmd-Enter': () => {
          if (this.props.onRun) {
            this.props.onRun();
          }
        },
        'Ctrl-Enter': () => {
          if (this.props.onRun) {
            this.props.onRun();
          }
        },
        'Cmd-S': () => {
          if (this.props.onSave) {
            this.props.onSave();
          }
        },
        'Ctrl-S': () => {
          if (this.props.onSave) {
            this.props.onSave();
          }
        },
        'Cmd-F': 'findPersistent',
        'Ctrl-F': 'findPersistent',
        'Cmd-H': 'replace',
        'Ctrl-H': 'replace',
        Tab: 'indentMore',
        'Shift-Tab': 'indentLess',
        'Ctrl-Y': 'foldAll',
        'Cmd-Y': 'foldAll',
        'Ctrl-I': 'unfoldAll',
        'Cmd-I': 'unfoldAll'
      },
      foldOptions: {
        widget: (from, to) => {
          var count = undefined;
          var internal = this.editor.getRange(from, to);
          if (this.props.mode == 'application/ld+json') {
            if (this.editor.getLine(from.line).endsWith('[')) {
              var toParse = '[' + internal + ']';
            } else var toParse = '{' + internal + '}';
            try {
              count = Object.keys(JSON.parse(toParse)).length;
            } catch (e) {}
          } else if (this.props.mode == 'application/xml') {
            var doc = new DOMParser();
            try {
              //add header element and remove prefix namespaces for DOMParser
              var dcm = doc.parseFromString(
                '<a> ' + internal.replace(/(?<=\<|<\/)\w+:/g, '') + '</a>',
                'application/xml'
              );
              count = dcm.documentElement.children.length;
            } catch (e) {}
          }
          return count ? `\u21A4${count}\u21A6` : '\u2194';
        }
      }
    }));
    if (editor) {
      editor.on('change', this._onEdit);
      this.addOverlay();
    }
    if (this.props.mode == 'javascript') {
      editor.on('keyup', function (cm, event) {
        const cursor = editor.getCursor();
        const currentLine = editor.getLine(cursor.line);
        let start = cursor.ch;
        let end = start;
        while (end < currentLine.length && /[\w\."'\/`]/.test(currentLine.charAt(end))) ++end;
        while (start && /[\w\."'\/`]/.test(currentLine.charAt(start - 1))) --start;
        let curWord = start != end && currentLine.slice(start, end);
        //Qualify if autocomplete will be shown
        if (
          /^(?!Shift|Tab|Enter|ArrowUp|ArrowDown|ArrowLeft|ArrowRight|\s)\w*/.test(event.key) &&
          curWord.length > 1 &&
          /^(?!"'\d`)[a-zA-Z\.]/.test(curWord)
        ) {
          CodeMirror.commands.autocomplete(cm, CodeMirror.hint.brunoJS, { completeSingle: false });
        }
      });
    }
  }

  componentDidUpdate(prevProps) {
    // Ensure the changes caused by this update are not interpreted as
    // user-input changes which could otherwise result in an infinite
    // event loop.
    this.ignoreChangeEvent = true;
    if (this.props.schema !== prevProps.schema && this.editor) {
      this.editor.options.lint.schema = this.props.schema;
      this.editor.options.hintOptions.schema = this.props.schema;
      this.editor.options.info.schema = this.props.schema;
      this.editor.options.jump.schema = this.props.schema;
      CodeMirror.signal(this.editor, 'change', this.editor);
    }
    if (this.props.value !== prevProps.value && this.props.value !== this.cachedValue && this.editor) {
      this.cachedValue = this.props.value;
      this.editor.setValue(this.props.value);
    }

    if (this.editor) {
      let variables = getEnvironmentVariables(this.props.collection);
      if (!isEqual(variables, this.variables)) {
        this.addOverlay();
      }
    }

    if (this.props.theme !== prevProps.theme && this.editor) {
      this.editor.setOption('theme', this.props.theme === 'dark' ? 'monokai' : 'default');
    }
    this.ignoreChangeEvent = false;
  }

  componentWillUnmount() {
    if (this.editor) {
      this.editor.off('change', this._onEdit);
      this.editor = null;
    }
  }

  render() {
    if (this.editor) {
      this.editor.refresh();
    }
    return (
      <StyledWrapper
        className="h-full w-full"
        aria-label="Code Editor"
        font={this.props.font}
        ref={(node) => {
          this._node = node;
        }}
      />
    );
  }

  addOverlay = () => {
    const mode = this.props.mode || 'application/ld+json';
    let variables = getEnvironmentVariables(this.props.collection);
    this.variables = variables;

    defineCodeMirrorBrunoVariablesMode(variables, mode);
    this.editor.setOption('mode', 'brunovariables');
  };

  _onEdit = () => {
    if (!this.ignoreChangeEvent && this.editor) {
      this.cachedValue = this.editor.getValue();
      if (this.props.onEdit) {
        this.props.onEdit(this.cachedValue);
      }
    }
  };
}