/* eslint-disable import/no-unresolved */
import React, { useContext, useEffect, useMemo, useRef } from 'react';
import CodeMirror from '@uiw/react-codemirror';
import { javascript, javascriptLanguage } from '@codemirror/lang-javascript';
import { defaultKeymap, indentWithTab } from '@codemirror/commands';
import { keymap } from '@codemirror/view';
import { completionKeymap, acceptCompletion, autocompletion, completionStatus } from '@codemirror/autocomplete';
import { python } from '@codemirror/lang-python';
import { sql } from '@codemirror/lang-sql';
import _ from 'lodash';
import { sass, sassCompletionSource } from '@codemirror/lang-sass';
import { okaidia } from '@uiw/codemirror-theme-okaidia';
import { githubLight } from '@uiw/codemirror-theme-github';
import { getSuggestionsForMultiLine } from './autocompleteExtensionConfig';
import ErrorBoundary from '@/_ui/ErrorBoundary';
import CodeHinter from './CodeHinter';
import { CodeHinterContext } from '../CodeBuilder/CodeHinterContext';
import { createReferencesLookup } from '@/_stores/utils';
import { PreviewBox } from './PreviewBox';
import useStore from '@/AppBuilder/_stores/store';
import { shallow } from 'zustand/shallow';
import { search, searchKeymap, searchPanelOpen } from '@codemirror/search';
import { handleSearchPanel } from './SearchBox';
import { useQueryPanelKeyHooks } from './useQueryPanelKeyHooks';
import { isInsideParent } from './utils';
import { CodeHinterBtns } from './CodehinterOverlayTriggers';
import useWorkflowStore from '@/_stores/workflowStore';

const langSupport = Object.freeze({
  javascript: javascript(),
  python: python(),
  sql: sql(),
  jsx: javascript({ jsx: true }),
  css: sass(),
});

const MultiLineCodeEditor = (props) => {
  const {
    darkMode,
    height,
    initialValue,
    lang,
    className,
    onChange,
    componentName,
    lineNumbers,
    placeholder,
    hideSuggestion,
    portalProps,
    showPreview,
    paramLabel = '',
    delayOnChange = true, // Added this prop to immediately update the onBlurUpdate callback
    readOnly = false,
    editable = true,
    renderCopilot,
    setCodeEditorView,
    onInputChange, // Added this prop to immediately handle value changes
  } = props;
  const editorRef = useRef(null);

  const replaceIdsWithName = useStore((state) => state.replaceIdsWithName, shallow);
  const wrapperRef = useRef(null);
  const getSuggestions = useStore((state) => state.getSuggestions, shallow);
  const getServerSideGlobalResolveSuggestions = useStore(
      (state) => state.getServerSideGlobalResolveSuggestions,
      shallow
  );

  const isInsideQueryPane = !!document.querySelector('.code-hinter-wrapper')?.closest('.query-details');
  const isInsideQueryManager = useMemo(
      () => isInsideParent(wrapperRef?.current, 'query-manager'),
      [wrapperRef.current]
  );

  const context = useContext(CodeHinterContext);

  const { workflowSuggestions } = useWorkflowStore((state) => ({ workflowSuggestions: state.suggestions }), shallow);

  const { suggestionList: paramList } = createReferencesLookup(context, true);

  const currentValueRef = useRef(initialValue);

  const [editorView, setEditorView] = React.useState(null);

  const [isSearchPanelOpen, setIsSearchPanelOpen] = React.useState(false);
  const { queryPanelKeybindings } = useQueryPanelKeyHooks(onChange, currentValueRef, 'multiline');

  // Add state for tracking autocomplete visibility
  const [showSuggestions, setShowSuggestions] = React.useState(true);
  const currentLineObserverRef = useRef(null);
  const isObserverTriggeredRef = useRef(false);

  // Intersection observer to detect when current line goes out of view
  useEffect(() => {
    const observer = new IntersectionObserver(
        ([entry]) => {
          if (entry.intersectionRatio < 1) {
            setShowSuggestions(false);
            isObserverTriggeredRef.current = true;
            // Close autocomplete dropdown by dispatching a selection change
            if (editorView) {
              editorView.dispatch({
                selection: editorView.state.selection,
              });
            }
          } else {
            setShowSuggestions(true);
            isObserverTriggeredRef.current = false;
          }
        },
        { root: null, threshold: [1] }
    );

    currentLineObserverRef.current = observer;

    return () => {
      if (currentLineObserverRef.current) {
        currentLineObserverRef.current.disconnect();
      }
    };
  }, [editorView]);

  const handleChange = (val) => {
    currentValueRef.current = val;
    onInputChange && onInputChange(val);
  };

  const handleOnBlur = () => {
    if (!delayOnChange) return onChange(currentValueRef.current);
    setTimeout(() => {
      onChange(currentValueRef.current);
    }, 100);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  };

  const heightInPx = typeof height === 'string' && height?.includes('px') ? height : `${height}px`;

  const theme = darkMode ? okaidia : githubLight;
  const langExtention = langSupport[lang] ?? null;

  const setupConfig = {
    lineNumbers: lineNumbers ?? true,
    syntaxHighlighting: true,
    bracketMatching: true,
    foldGutter: true,
    highlightActiveLine: false,
    autocompletion: hideSuggestion ?? true,
    highlightActiveLineGutter: false,
    defaultKeymap: false,
    completionKeymap: true,
    searchKeymap: false,
  };

  function autoCompleteExtensionConfig(context) {
    const hasWorkflowSuggestions =
        workflowSuggestions?.appHints?.length > 0 || workflowSuggestions?.jsHints?.length > 0;
    const hints = hasWorkflowSuggestions ? workflowSuggestions : getSuggestions();
    const serverHints = getServerSideGlobalResolveSuggestions(isInsideQueryManager);

    const allHints = {
      ...hints,
      appHints: [...hints.appHints, ...serverHints],
    };

    return getSuggestionsForMultiLine(context, allHints, hints, lang, paramList);
  }

  const customKeyMaps = [
    ...defaultKeymap.filter((keyBinding) => keyBinding.key !== 'Mod-Enter'), // Remove default keybinding for Mod-Enter
    ...completionKeymap,
    ...searchKeymap,
  ];

  const customTabKeymap = keymap.of([
    {
      key: 'Tab',
      run: (view) => {
        if (completionStatus(view.state)) {
          return acceptCompletion(view);
        }

        const { state } = view;
        const { selection } = state;
        const { anchor } = selection.main;
        const tabSize = 2;

        view.dispatch({
          changes: { from: anchor, insert: ' '.repeat(tabSize) },
          selection: { anchor: anchor + tabSize },
        });
        return true;
      },
    },
    ...queryPanelKeybindings,
  ]);

  // eslint-disable-next-line react-hooks/exhaustive-deps
  const overRideFunction = React.useCallback((context) => autoCompleteExtensionConfig(context), [paramList]);
  const { handleTogglePopupExapand, isOpen, setIsOpen, forceUpdate } = portalProps;
  let cyLabel = paramLabel ? paramLabel.toLowerCase().trim().replace(/\s+/g, '-') : props.cyLabel;

  const initialValueWithReplacedIds = useMemo(() => {
    if (
        typeof initialValue === 'string' &&
        (initialValue?.includes('components') || initialValue?.includes('queries'))
    ) {
      return replaceIdsWithName(initialValue);
    }
    return initialValue;
  }, [initialValue, replaceIdsWithName]);

  function updateCurrentLineObserver(editorView) {
    if (!editorView || !editorView?.view?.dom) return;
    const cursorPos = editorView.state.selection.main.head;
    const line = editorView.state.doc.lineAt(cursorPos);
    const lineNumber = line.number;
    const cmLines = editorView.view.dom.querySelectorAll('.cm-line');
    const currentLineDiv = cmLines[lineNumber - 1] || null;

    // Update intersection observer to watch the current line
    if (currentLineObserverRef.current && currentLineDiv && !isObserverTriggeredRef.current) {
      currentLineObserverRef.current.disconnect();
      currentLineObserverRef.current.observe(currentLineDiv);
    }
  }

  const onAiSuggestionAccept = (newValue) => {
    currentValueRef.current = newValue;
    onChange(newValue);
  };

  return (
      <div
          className={`code-hinter-wrapper position-relative ${isInsideQueryPane ? 'code-editor-query-panel' : ''}`}
          style={{ width: '100%' }}
          ref={wrapperRef}
      >
        <div className={`${className} ${darkMode && 'cm-codehinter-dark-themed'}`}>
          <CodeHinterBtns
              view={editorView}
              isPanelOpen={isSearchPanelOpen}
              renderCopilot={() =>
                  renderCopilot?.({
                    darkMode,
                    language: lang,
                    editorRef,
                    onAiSuggestionAccept,
                  })
              }
          />

          <CodeHinter.PopupIcon
              callback={handleTogglePopupExapand}
              icon="portal-open"
              tip="Pop out code editor into a new window"
              isMultiEditor={true}
              isQueryManager={isInsideQueryPane}
              position={{height: height}}
          />

          <CodeHinter.Portal
              isCopilotEnabled={false}
              isOpen={isOpen}
              callback={setIsOpen}
              componentName={componentName}
              key={componentName}
              forceUpdate={forceUpdate}
              optionalProps={{ styles: { height: 300 }, cls: '' }}
              darkMode={darkMode}
              selectors={{ className: 'preview-block-portal' }}
              dragResizePortal={true}
              callgpt={null}
          >
            <ErrorBoundary>
              <div className="codehinter-container w-100 " data-cy={`${cyLabel}-input-field`} style={{ height: '100%' }}>
                <CodeMirror
                    ref={editorRef}
                    value={initialValueWithReplacedIds}
                    placeholder={placeholder}
                    height={heightInPx}
                    minHeight={heightInPx}
                    {...(isInsideQueryPane ? { maxHeight: '100%' } : {})}
                    width="100%"
                    theme={theme}
                    extensions={[
                      langExtention,
                      search({
                        createPanel: handleSearchPanel,
                      }),
                      javascriptLanguage.data.of({
                        autocomplete: overRideFunction,
                      }),
                      python().language.data.of({
                        autocomplete: overRideFunction,
                      }),
                      sql().language.data.of({
                        autocomplete: overRideFunction,
                      }),
                      sass().language.data.of({
                        autocomplete: sassCompletionSource,
                      }),
                      autocompletion({
                        override: [overRideFunction],
                        activateOnTyping: true,
                        compareCompletions: (a, b) => {
                          return a.section.rank - b.section.rank && a.label.localeCompare(b.label);
                        },
                      }),
                      customTabKeymap,
                      keymap.of([...customKeyMaps]),
                    ]}
                    onChange={handleChange}
                    onBlur={handleOnBlur}
                    basicSetup={setupConfig}
                    style={{
                      overflowY: 'auto',
                    }}
                    className={`codehinter-multi-line-input ${isInsideQueryPane ? 'code-editor-query-panel' : ''}`}
                    indentWithTab={false}
                    readOnly={readOnly}
                    editable={editable} //for transformations in query manager
                    onCreateEditor={(view) => {
                      setEditorView(view);
                      if (setCodeEditorView) {
                        setCodeEditorView(view);
                      }
                    }}
                    onUpdate={(view) => {
                      setIsSearchPanelOpen(searchPanelOpen(view.state));
                      updateCurrentLineObserver(view);
                    }}
                />
              </div>
              {showPreview && (
                  <div className="multiline-previewbox-wrapper">
                    <PreviewBox
                        currentValue={currentValueRef.current}
                        validationSchema={null}
                        setErrorStateActive={() => null}
                        componentId={null}
                        setErrorMessage={() => null}
                    />
                  </div>
              )}
            </ErrorBoundary>
          </CodeHinter.Portal>
        </div>
      </div>
  );
};

export default MultiLineCodeEditor;