import { useState, useEffect } from 'react';
import { jobs } from '../utils/api';
import JobDetails from './JobDetails';

export default function JobList() {
  const [jobList, setJobList] = useState([]);
  const [loading, setLoading] = useState(true);
  const [selectedJob, setSelectedJob] = useState(null);

  useEffect(() => {
    loadJobs();
    const interval = setInterval(loadJobs, 5000);
    return () => clearInterval(interval);
  }, []);

  const loadJobs = async () => {
    try {
      const data = await jobs.list();
      setJobList(data);
    } catch (error) {
      console.error('Failed to load jobs:', error);
    } finally {
      setLoading(false);
    }
  };

  const handleCancel = async (jobId) => {
    if (!confirm('Are you sure you want to cancel this job?')) return;
    try {
      await jobs.cancel(jobId);
      loadJobs();
    } catch (error) {
      alert('Failed to cancel job: ' + error.message);
    }
  };

  const handleDelete = async (jobId) => {
    if (!confirm('Are you sure you want to permanently delete this job? This action cannot be undone.')) return;
    try {
      await jobs.delete(jobId);
      loadJobs();
      if (selectedJob && selectedJob.id === jobId) {
        setSelectedJob(null);
      }
    } catch (error) {
      alert('Failed to delete job: ' + error.message);
    }
  };

  const getStatusColor = (status) => {
    const colors = {
      pending: 'bg-yellow-400/20 text-yellow-400',
      running: 'bg-orange-400/20 text-orange-400',
      completed: 'bg-green-400/20 text-green-400',
      failed: 'bg-red-400/20 text-red-400',
      cancelled: 'bg-gray-500/20 text-gray-400',
    };
    return colors[status] || colors.pending;
  };

  if (loading) {
    return (
      <div className="flex justify-center items-center h-64">
        <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-orange-500"></div>
      </div>
    );
  }

  if (jobList.length === 0) {
    return (
      <div className="text-center py-12">
        <p className="text-gray-400 text-lg">No jobs yet. Submit a job to get started!</p>
      </div>
    );
  }

  return (
    <>
      <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
        {jobList.map((job) => (
          <div
            key={job.id}
            className="bg-gray-800 rounded-lg shadow-md hover:shadow-lg transition-shadow p-6 border-l-4 border-orange-500 border border-gray-700"
          >
            <div className="flex justify-between items-start mb-4">
              <h3 className="text-xl font-semibold text-gray-100">{job.name}</h3>
              <span className={`px-3 py-1 rounded-full text-xs font-medium ${getStatusColor(job.status)}`}>
                {job.status}
              </span>
            </div>

            <div className="space-y-2 text-sm text-gray-400 mb-4">
              <p>Frames: {job.frame_start} - {job.frame_end}</p>
              <p>Format: {job.output_format}</p>
              <p>Created: {new Date(job.created_at).toLocaleString()}</p>
            </div>

            <div className="mb-4">
              <div className="flex justify-between text-xs text-gray-400 mb-1">
                <span>Progress</span>
                <span>{job.progress.toFixed(1)}%</span>
              </div>
              <div className="w-full bg-gray-700 rounded-full h-2">
                <div
                  className="bg-orange-500 h-2 rounded-full transition-all duration-300"
                  style={{ width: `${job.progress}%` }}
                ></div>
              </div>
            </div>

            <div className="flex gap-2">
              <button
                onClick={() => setSelectedJob(job)}
                className="flex-1 px-4 py-2 bg-orange-600 text-white rounded-lg hover:bg-orange-500 transition-colors font-medium"
              >
                View Details
              </button>
              {(job.status === 'pending' || job.status === 'running') && (
                <button
                  onClick={() => handleCancel(job.id)}
                  className="px-4 py-2 bg-gray-700 text-gray-200 rounded-lg hover:bg-gray-600 transition-colors font-medium"
                >
                  Cancel
                </button>
              )}
              {(job.status === 'completed' || job.status === 'failed' || job.status === 'cancelled') && (
                <button
                  onClick={() => handleDelete(job.id)}
                  className="px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-500 transition-colors font-medium"
                  title="Delete job"
                >
                  Delete
                </button>
              )}
            </div>
          </div>
        ))}
      </div>

      {selectedJob && (
        <JobDetails
          job={selectedJob}
          onClose={() => setSelectedJob(null)}
          onUpdate={loadJobs}
        />
      )}
    </>
  );
}