/**
 * CronManagerPanel — displays and manages scheduled cron jobs.
 * Uses real JSON API endpoint /api/cron/:sessionId
 */
import { useState, useEffect, useCallback } from "react";
import { Timer, RefreshCw, Clock } from "lucide-react";

interface CronJob {
  id: string;
  schedule: string;
  command: string;
  description: string;
  status: "active" | "paused" | "deleted";
  createdAt: number;
  lastRun?: number;
  runCount: number;
  output: string;
}

interface CronManagerPanelProps {
  sessionId: number;
  onSlashCommand: (command: string, args?: string) => Promise<string>;
}

export function CronManagerPanel({ sessionId }: CronManagerPanelProps) {
  const [jobs, setJobs] = useState<CronJob[]>([]);
  const [loading, setLoading] = useState(false);
  const [expandedJob, setExpandedJob] = useState<string | null>(null);

  const refreshJobs = useCallback(async () => {
    setLoading(true);
    try {
      const res = await fetch(`/api/cron/${sessionId}`);
      if (res.ok) {
        const data = await res.json();
        if (Array.isArray(data)) setJobs(data);
      }
    } catch {
      // ignore fetch errors
    } finally {
      setLoading(false);
    }
  }, [sessionId]);

  useEffect(() => {
    refreshJobs();
    // Auto-refresh every 5 seconds
    const interval = setInterval(refreshJobs, 5000);
    return () => clearInterval(interval);
  }, [refreshJobs]);

  const statusBadge = (status: string) => {
    const colors: Record<string, string> = {
      active: "bg-green-500/10 text-green-400 border-green-500/20",
      paused: "bg-yellow-500/10 text-yellow-400 border-yellow-500/20",
      deleted: "bg-red-500/10 text-red-400 border-red-500/20",
    };
    return (
      <span className={`px-2 py-0.5 rounded-full text-xs border ${colors[status] || "bg-muted text-muted-foreground"}`}>
        {status}
      </span>
    );
  };

  return (
    <div className="flex flex-col h-full">
      <div className="flex items-center justify-between px-4 py-3 border-b border-border">
        <h3 className="text-sm font-semibold flex items-center gap-2">
          <Timer className="w-4 h-4" />
          Cron Jobs ({jobs.length})
        </h3>
        <button
          onClick={refreshJobs}
          disabled={loading}
          className="p-1.5 rounded hover:bg-accent transition-colors"
        >
          <RefreshCw className={`w-4 h-4 ${loading ? "animate-spin" : ""}`} />
        </button>
      </div>

      <div className="flex-1 overflow-y-auto">
        {jobs.length === 0 ? (
          <div className="flex flex-col items-center justify-center h-full text-muted-foreground text-sm gap-2 p-4">
            <Clock className="w-8 h-8 opacity-40" />
            <p>No scheduled cron jobs</p>
            <p className="text-xs opacity-60">Jobs created via CronCreate tool will appear here</p>
          </div>
        ) : (
          <div className="divide-y divide-border">
            {jobs.map((job) => (
              <div key={job.id} className="p-3">
                <button
                  onClick={() => setExpandedJob(expandedJob === job.id ? null : job.id)}
                  className="w-full flex items-start justify-between gap-2 text-left"
                >
                  <div className="flex-1 min-w-0">
                    <div className="flex items-center gap-2">
                      <p className="text-sm font-medium truncate">{job.description || job.command}</p>
                      {statusBadge(job.status)}
                    </div>
                    <p className="text-xs text-muted-foreground mt-1 font-mono">
                      {job.schedule}
                    </p>
                    <p className="text-xs text-muted-foreground">
                      Runs: {job.runCount} · {job.lastRun ? `Last: ${new Date(job.lastRun).toLocaleTimeString()}` : "Not yet run"}
                    </p>
                  </div>
                </button>
                {expandedJob === job.id && (
                  <pre className="mt-2 p-2 rounded bg-muted text-xs font-mono whitespace-pre-wrap max-h-40 overflow-y-auto">
                    {job.output || "(no output yet)"}
                  </pre>
                )}
              </div>
            ))}
          </div>
        )}
      </div>
    </div>
  );
}