frontend/src/components/CaseSelector.tsx

import { useEffect, useState } from "react";
import { apiClient } from "../api/client";

interface CaseSelectorProps {
  selectedCase: string | null;
  onSelectCase: (caseId: string) => void;
}

export function CaseSelector({
  selectedCase,
  onSelectCase,
}: CaseSelectorProps) {
  const [cases, setCases] = useState<string[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    const abortController = new AbortController();

    const fetchCases = async () => {
      try {
        const data = await apiClient.getCases(abortController.signal);
        setCases(data.cases);
      } catch (err) {
        // Ignore abort errors - component unmounted
        if (err instanceof Error && err.name === "AbortError") return;

        const message = err instanceof Error ? err.message : "Unknown error";
        setError(`Failed to load cases: ${message}`);
      } finally {
        if (!abortController.signal.aborted) {
          setIsLoading(false);
        }
      }
    };

    fetchCases();

    return () => abortController.abort();
  }, []);

  if (isLoading) {
    return (
      <div className="bg-gray-800 rounded-lg p-4">
        <p className="text-gray-400">Loading cases...</p>
      </div>
    );
  }

  if (error) {
    return (
      <div className="bg-red-900/50 rounded-lg p-4">
        <p className="text-red-300">{error}</p>
      </div>
    );
  }

  return (
    <div className="bg-gray-800 rounded-lg p-4">
      <label className="block text-sm font-medium mb-2">Select Case</label>
      <select
        value={selectedCase || ""}
        onChange={(e) => onSelectCase(e.target.value)}
        className="w-full bg-gray-700 border border-gray-600 rounded-lg px-3 py-2
                   text-white focus:ring-2 focus:ring-blue-500 focus:border-transparent"
      >
        <option value="">Choose a case...</option>
        {cases.map((caseId) => (
          <option key={caseId} value={caseId}>
            {caseId}
          </option>
        ))}
      </select>
    </div>
  );
}