/**
 * Breadcrumb navigation for the active file in the editor.
 *
 * Each segment is clickable — expands and scrolls the folder in the file tree.
 */

import { useMemo } from 'react';

import { useStore } from '@renderer/store';
import { ChevronRight } from 'lucide-react';

import { getFileIcon } from './fileIcons';

// =============================================================================
// Component
// =============================================================================

export const EditorBreadcrumb = (): React.ReactElement | null => {
  const activeTabId = useStore((s) => s.editorActiveTabId);
  const projectPath = useStore((s) => s.editorProjectPath);
  const expandDirectory = useStore((s) => s.expandDirectory);

  const segments = useMemo(() => {
    if (!activeTabId || !projectPath) return [];

    const relativePath = activeTabId.startsWith(projectPath)
      ? activeTabId.slice(projectPath.length + 1)
      : activeTabId;

    return relativePath.split('/');
  }, [activeTabId, projectPath]);

  if (segments.length === 0) return null;

  const fileName = segments[segments.length - 1];
  const iconInfo = getFileIcon(fileName);
  const Icon = iconInfo.icon;

  const handleSegmentClick = (segmentIndex: number): void => {
    if (!projectPath) return;
    // Build absolute path up to this segment (it's a directory)
    const dirSegments = segments.slice(0, segmentIndex + 1);
    const dirPath = `${projectPath}/${dirSegments.join('/')}`;
    void expandDirectory(dirPath);
  };

  return (
    <div className="flex items-center gap-0.5 overflow-x-auto px-3 py-1 text-xs text-text-muted">
      {segments.map((segment, idx) => {
        const isLast = idx === segments.length - 1;
        return (
          <span key={idx} className="flex shrink-0 items-center gap-0.5">
            {idx > 0 && <ChevronRight className="text-text-muted/50 size-3" />}
            {isLast ? (
              <span className="flex items-center gap-1 text-text-secondary">
                <Icon className="size-3" style={{ color: iconInfo.color }} />
                {segment}
              </span>
            ) : (
              <button
                onClick={() => handleSegmentClick(idx)}
                className="rounded px-0.5 transition-colors hover:bg-surface-raised hover:text-text-secondary"
              >
                {segment}
              </button>
            )}
          </span>
        );
      })}
    </div>
  );
};
