import React, { PureComponent } from 'react';
import Box from '@mui/material/Box';
import Typography from '@mui/material/Typography';
import IconButton from '@mui/material/IconButton';
import FolderOpenRoundedIcon from '@mui/icons-material/FolderOpenRounded';
import CloseRoundedIcon from '@mui/icons-material/CloseRounded';

import vfsAutomat from '../../automats/vfsAutomat';
import VfsFileExplorer from './VfsFileExplorer';
import VfsTextEditor from './VfsTextEditor';
import VfsFilePreview from './VfsFilePreview';
import VfsNewFileDialog from './VfsNewFileDialog';

export default class VfsEditorPanel extends PureComponent {
  constructor(props) {
    super(props);
    const s = vfsAutomat.state;
    this.state = {
      files: s.files,
      loadingFiles: s.loadingFiles,
      loadError: s.loadError,
      selectedFileName: s.selectedFileName,
      selectedFile: s.selectedFile,
      fileContent: s.fileContent,
      originalContent: s.originalContent,
      isDirty: s.isDirty,
      loadingContent: s.loadingContent,
      isSaving: s.isSaving,
      saveError: s.saveError,
      isUploading: s.isUploading,
      searchQuery: s.searchQuery,
      newFileDialogOpen: s.newFileDialogOpen,
      newFileDefaultFolder: s.newFileDefaultFolder,
    };
  }

  componentDidMount() {
    this.unsub = vfsAutomat.subscribe(this, (state) => ({
      files: state.files,
      loadingFiles: state.loadingFiles,
      loadError: state.loadError,
      selectedFileName: state.selectedFileName,
      selectedFile: state.selectedFile,
      fileContent: state.fileContent,
      originalContent: state.originalContent,
      isDirty: state.isDirty,
      loadingContent: state.loadingContent,
      isSaving: state.isSaving,
      saveError: state.saveError,
      isUploading: state.isUploading,
      searchQuery: state.searchQuery,
      newFileDialogOpen: state.newFileDialogOpen,
      newFileDefaultFolder: state.newFileDefaultFolder,
    }));

    if (this.state.files.length === 0 && !this.state.loadingFiles) {
      void vfsAutomat.actions.loadFiles();
    }
  }

  componentWillUnmount() {
    this.unsub?.();
  }

  handleMentionInChat = (file, lineInfo = null) => {
    if (!file) return;
    if (this.props.onMentionReference) {
      this.props.onMentionReference({
        fileName: file.name,
        path: file.name,
        startLine: lineInfo?.startLine || null,
        endLine: lineInfo?.endLine || null,
        selectedText: lineInfo?.selectedText || '',
        isImage: file.isImage || false,
      });
      return;
    }
    if (this.props.onInsertToChat) {
      const isImg = file.isImage;
      const tag = lineInfo?.startLine
        ? `[${file.name}#${lineInfo.startLine === lineInfo.endLine ? `L${lineInfo.startLine}` : `L${lineInfo.startLine}-L${lineInfo.endLine}`}](${file.name}#${lineInfo.startLine === lineInfo.endLine ? `L${lineInfo.startLine}` : `L${lineInfo.startLine}-L${lineInfo.endLine}`})`
        : isImg
          ? `![${file.name}](${file.name})`
          : `[${file.name}](${file.name})`;
      this.props.onInsertToChat(tag);
    }
  };

  render() {
    const {
      files,
      loadingFiles,
      selectedFileName,
      selectedFile,
      fileContent,
      originalContent,
      isDirty,
      loadingContent,
      isSaving,
      saveError,
      searchQuery,
      newFileDialogOpen,
    } = this.state;

    return (
      <Box
        sx={{
          display: 'flex',
          flexDirection: 'column',
          height: '100%',
          width: '100%',
          overflow: 'hidden',
          bgcolor: 'background.paper',
          borderRight: 1,
          borderColor: 'divider',
        }}
      >
        {selectedFileName && selectedFile?.isText ? (
          /* Single Column Mode: Text Editor */
          <VfsTextEditor
            fileName={selectedFileName}
            file={selectedFile}
            content={fileContent}
            originalContent={originalContent}
            isDirty={isDirty}
            isSaving={isSaving}
            saveError={saveError}
            loadingContent={loadingContent}
            onChange={(c) => vfsAutomat.actions.updateContent(c)}
            onSave={() => vfsAutomat.actions.saveCurrentFile()}
            onClose={() => vfsAutomat.actions.selectFile(null)}
            onDownload={() => vfsAutomat.actions.downloadFile(selectedFileName)}
            onMentionInChat={(lineInfo) => this.handleMentionInChat(selectedFile, lineInfo)}
          />
        ) : selectedFileName && !selectedFile?.isText ? (
          /* Single Column Mode: Preview (Image, PDF, Binary) */
          <VfsFilePreview
            fileName={selectedFileName}
            file={selectedFile}
            onClose={() => vfsAutomat.actions.selectFile(null)}
            onDownload={() => vfsAutomat.actions.downloadFile(selectedFileName)}
            onMentionInChat={() => this.handleMentionInChat(selectedFile)}
          />
        ) : (
          /* Single Column Mode: File Explorer */
          <>
            <Box
              sx={{
                p: 1.5,
                px: 2,
                borderBottom: 1,
                borderColor: 'divider',
                display: 'flex',
                alignItems: 'center',
                justifyContent: 'space-between',
                bgcolor: 'background.paper',
                minHeight: 52,
                flexShrink: 0,
              }}
            >
              <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                <FolderOpenRoundedIcon color="primary" sx={{ fontSize: 22 }} />
                <Typography variant="subtitle1" fontWeight={700}>
                  Dateien
                </Typography>
              </Box>

              <IconButton
                size="small"
                onClick={() => vfsAutomat.actions.closeVfs()}
                aria-label="VFS schließen"
              >
                <CloseRoundedIcon fontSize="small" />
              </IconButton>
            </Box>

            <Box sx={{ flexGrow: 1, minHeight: 0, overflow: 'hidden' }}>
              <VfsFileExplorer
                files={files}
                loading={loadingFiles}
                selectedFileName={selectedFileName}
                searchQuery={searchQuery}
                onSelectFile={(name) => vfsAutomat.actions.selectFile(name)}
                onRefresh={() => vfsAutomat.actions.loadFiles()}
                onOpenNewDialog={(parentDir) => vfsAutomat.actions.setNewFileDialogOpen(true, parentDir)}
                onSearchChange={(q) => vfsAutomat.actions.setSearchQuery(q)}
                onDownload={(name) => vfsAutomat.actions.downloadFile(name)}
                onDelete={(name) => vfsAutomat.actions.deletePath(name)}
                onRename={(oldPath, newPath) => vfsAutomat.actions.renameFile(oldPath, newPath)}
                onMkdir={(dirPath) => vfsAutomat.actions.mkdir(dirPath)}
                onUpload={(filesToUpload) => vfsAutomat.actions.uploadFiles(filesToUpload)}
                onMentionInChat={this.handleMentionInChat}
              />
            </Box>
          </>
        )}

        {/* New File Dialog */}
        <VfsNewFileDialog
          open={newFileDialogOpen}
          defaultFolder={this.state.newFileDefaultFolder}
          onClose={() => vfsAutomat.actions.setNewFileDialogOpen(false)}
          onCreate={(name) => vfsAutomat.actions.createFile(name)}
          isCreating={isSaving}
        />
      </Box>
    );
  }
}