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import { useStore } from '@nanostores/react';
import { memo, useEffect, useMemo, useRef, useState } from 'react';
import { Panel, PanelGroup, PanelResizeHandle, type ImperativePanelHandle } from 'react-resizable-panels';
import {
  CodeMirrorEditor,
  type EditorDocument,
  type EditorSettings,
  type OnChangeCallback as OnEditorChange,
  type OnSaveCallback as OnEditorSave,
  type OnScrollCallback as OnEditorScroll,
} from '~/components/editor/codemirror/CodeMirrorEditor';
import { IconButton } from '~/components/ui/IconButton';
import { PanelHeader } from '~/components/ui/PanelHeader';
import { PanelHeaderButton } from '~/components/ui/PanelHeaderButton';
import { shortcutEventEmitter } from '~/lib/hooks';
import type { FileMap } from '~/lib/stores/files';
import { themeStore } from '~/lib/stores/theme';
import { workbenchStore } from '~/lib/stores/workbench';
import { classNames } from '~/utils/classNames';
import { renderLogger } from '~/utils/logger';
import { isMobile } from '~/utils/mobile';
import { FileTreePanel } from './FileTreePanel';
import { Terminal, type TerminalRef } from './terminal/Terminal';

interface EditorPanelProps {
  files?: FileMap;
  unsavedFiles?: Set<string>;
  editorDocument?: EditorDocument;
  selectedFile?: string | undefined;
  isStreaming?: boolean;
  onEditorChange?: OnEditorChange;
  onEditorScroll?: OnEditorScroll;
  onFileSelect?: (value?: string) => void;
  onFileSave?: OnEditorSave;
  onFileReset?: () => void;
}

const MAX_TERMINALS = 3;
const DEFAULT_TERMINAL_SIZE = 25;
const DEFAULT_EDITOR_SIZE = 100 - DEFAULT_TERMINAL_SIZE;

const editorSettings: EditorSettings = { tabSize: 2 };

export const EditorPanel = memo(
  ({
    files,
    unsavedFiles,
    editorDocument,
    selectedFile,
    isStreaming,
    onFileSelect,
    onEditorChange,
    onEditorScroll,
    onFileSave,
    onFileReset,
  }: EditorPanelProps) => {
    renderLogger.trace('EditorPanel');

    const theme = useStore(themeStore);
    const showTerminal = useStore(workbenchStore.showTerminal);

    const terminalRefs = useRef<Array<TerminalRef | null>>([]);
    const terminalPanelRef = useRef<ImperativePanelHandle>(null);
    const terminalToggledByShortcut = useRef(false);

    const [activeTerminal, setActiveTerminal] = useState(0);
    const [terminalCount, setTerminalCount] = useState(1);

    const activeFile = useMemo(() => {
      if (!editorDocument) {
        return '';
      }

      return editorDocument.filePath.split('/').at(-1);
    }, [editorDocument]);

    const activeFileUnsaved = useMemo(() => {
      return editorDocument !== undefined && unsavedFiles?.has(editorDocument.filePath);
    }, [editorDocument, unsavedFiles]);

    useEffect(() => {
      const unsubscribeFromEventEmitter = shortcutEventEmitter.on('toggleTerminal', () => {
        terminalToggledByShortcut.current = true;
      });

      const unsubscribeFromThemeStore = themeStore.subscribe(() => {
        for (const ref of Object.values(terminalRefs.current)) {
          ref?.reloadStyles();
        }
      });

      return () => {
        unsubscribeFromEventEmitter();
        unsubscribeFromThemeStore();
      };
    }, []);

    useEffect(() => {
      const { current: terminal } = terminalPanelRef;

      if (!terminal) {
        return;
      }

      const isCollapsed = terminal.isCollapsed();

      if (!showTerminal && !isCollapsed) {
        terminal.collapse();
      } else if (showTerminal && isCollapsed) {
        terminal.resize(DEFAULT_TERMINAL_SIZE);
      }

      terminalToggledByShortcut.current = false;
    }, [showTerminal]);

    const addTerminal = () => {
      if (terminalCount < MAX_TERMINALS) {
        setTerminalCount(terminalCount + 1);
        setActiveTerminal(terminalCount);
      }
    };

    return (
      <PanelGroup direction="vertical">
        <Panel defaultSize={showTerminal ? DEFAULT_EDITOR_SIZE : 100} minSize={20}>
          <PanelGroup direction="horizontal">
            <Panel defaultSize={25} minSize={10} collapsible>
              <div className="flex flex-col border-r h-full">
                <PanelHeader>
                  <div className="i-ph:tree-structure-duotone shrink-0" />
                  Files
                </PanelHeader>
                <FileTreePanel
                  files={files}
                  unsavedFiles={unsavedFiles}
                  selectedFile={selectedFile}
                  onFileSelect={onFileSelect}
                />
              </div>
            </Panel>
            <PanelResizeHandle />
            <Panel className="flex flex-col" defaultSize={75} minSize={20}>
              <PanelHeader>
                {activeFile && (
                  <div className="flex items-center flex-1 text-sm">
                    {activeFile} {isStreaming && <span className="text-xs ml-1 font-semibold">(read-only)</span>}
                    {activeFileUnsaved && (
                      <div className="flex gap-1 ml-auto -mr-1.5">
                        <PanelHeaderButton onClick={onFileSave}>
                          <div className="i-ph:floppy-disk-duotone" />
                          Save
                        </PanelHeaderButton>
                        <PanelHeaderButton onClick={onFileReset}>
                          <div className="i-ph:clock-counter-clockwise-duotone" />
                          Reset
                        </PanelHeaderButton>
                      </div>
                    )}
                  </div>
                )}
              </PanelHeader>
              <div className="h-full flex-1 overflow-hidden">
                <CodeMirrorEditor
                  theme={theme}
                  editable={!isStreaming && editorDocument !== undefined}
                  settings={editorSettings}
                  doc={editorDocument}
                  autoFocusOnDocumentChange={!isMobile()}
                  onScroll={onEditorScroll}
                  onChange={onEditorChange}
                  onSave={onFileSave}
                />
              </div>
            </Panel>
          </PanelGroup>
        </Panel>
        <PanelResizeHandle />
        <Panel
          ref={terminalPanelRef}
          defaultSize={showTerminal ? DEFAULT_TERMINAL_SIZE : 0}
          minSize={10}
          collapsible
          onExpand={() => {
            if (!terminalToggledByShortcut.current) {
              workbenchStore.toggleTerminal(true);
            }
          }}
          onCollapse={() => {
            if (!terminalToggledByShortcut.current) {
              workbenchStore.toggleTerminal(false);
            }
          }}
        >
          <div className="border-t h-full flex flex-col">
            <div className="flex items-center bg-gray-50 min-h-[34px]">
              {Array.from({ length: terminalCount }, (_, index) => {
                const isActive = activeTerminal === index;

                return (
                  <button
                    key={index}
                    className={classNames(
                      'flex items-center text-sm bg-transparent cursor-pointer gap-1.5 px-3.5 h-full whitespace-nowrap',
                      {
                        'bg-white': isActive,
                        'hover:bg-gray-100': !isActive,
                      },
                    )}
                    onClick={() => setActiveTerminal(index)}
                  >
                    <div className="i-ph:terminal-window-duotone text-md" />
                    Terminal {terminalCount > 1 && index + 1}
                  </button>
                );
              })}
              {terminalCount < MAX_TERMINALS && (
                <IconButton className="ml-2" icon="i-ph:plus" size="md" onClick={addTerminal} />
              )}
            </div>
            {Array.from({ length: terminalCount }, (_, index) => {
              const isActive = activeTerminal === index;

              return (
                <Terminal
                  key={index}
                  className={classNames('h-full overflow-hidden', {
                    hidden: !isActive,
                  })}
                  ref={(ref) => {
                    terminalRefs.current.push(ref);
                  }}
                  onTerminalReady={(terminal) => workbenchStore.attachTerminal(terminal)}
                  onTerminalResize={(cols, rows) => workbenchStore.onTerminalResize(cols, rows)}
                  theme={theme}
                />
              );
            })}
          </div>
        </Panel>
      </PanelGroup>
    );
  },
);