'use client';

import { useState } from 'react';
import { useProcesses } from '@/lib/hooks/useSupervisor';
import { ProcessCard } from '@/components/process/ProcessCard';
import { GroupView } from '@/components/groups/GroupView';
import { GroupSelector } from '@/components/groups/GroupSelector';
import { RefreshCw, AlertCircle } from 'lucide-react';
import { Button } from '@/components/ui/button';

export default function ProcessesPage() {
  const [viewMode, setViewMode] = useState<'flat' | 'grouped'>('flat');
  const { data: processes, isLoading, isError, refetch } = useProcesses();

  if (isLoading) {
    return (
      <div className="space-y-6">
        <h1 className="text-3xl font-bold">Processes</h1>
        <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
          {[1, 2, 3, 4, 5, 6].map((i) => (
            <div key={i} className="h-64 bg-muted rounded-lg animate-pulse" />
          ))}
        </div>
      </div>
    );
  }

  if (isError) {
    return (
      <div className="space-y-6">
        <h1 className="text-3xl font-bold">Processes</h1>
        <div className="flex flex-col items-center justify-center p-12 text-center">
          <AlertCircle className="h-12 w-12 text-destructive mb-4" />
          <h2 className="text-xl font-semibold mb-2">Failed to load processes</h2>
          <p className="text-muted-foreground mb-4">
            Could not connect to Supervisor. Please check your configuration.
          </p>
          <Button onClick={() => refetch()}>
            <RefreshCw className="h-4 w-4 mr-2" />
            Retry
          </Button>
        </div>
      </div>
    );
  }

  return (
    <div className="space-y-6 animate-fade-in">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-3xl font-bold">Processes</h1>
          <p className="text-muted-foreground mt-1">
            {processes?.length ?? 0} processes configured
          </p>
        </div>
        <div className="flex items-center gap-4">
          <GroupSelector viewMode={viewMode} onViewModeChange={setViewMode} />
          <Button variant="outline" onClick={() => refetch()}>
            <RefreshCw className="h-4 w-4 mr-2" />
            Refresh
          </Button>
        </div>
      </div>

      {processes && processes.length === 0 ? (
        <div className="flex flex-col items-center justify-center p-12 text-center border-2 border-dashed rounded-lg">
          <p className="text-muted-foreground">No processes configured</p>
        </div>
      ) : viewMode === 'grouped' ? (
        <GroupView processes={processes || []} />
      ) : (
        <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
          {processes?.map((process) => (
            <ProcessCard key={`${process.group}:${process.name}`} process={process} />
          ))}
        </div>
      )}
    </div>
  );
}