import { useRouter } from 'next/router';
import { useCallback, useEffect, useState } from 'react';
import Layout from '../../components/Layout';
import JobMap from '../../components/map/JobMap';
import { pointSummary, type LiveStatus, type MapPoint } from '../../components/map/types';
import { api } from '../../lib/api';
import { useRequireAuth } from '../../lib/auth-context';
import { useJobStream } from '../../lib/use-job-stream';

interface JobDetail {
  id: string;
  ticketNumber: string;
  title: string;
  description: string | null;
  address: string | null;
  status: string;
  source: string;
  dueAt: string | null;
  createdAt: string;
  assignedTo: { id: string; name: string; email: string } | null;
  _count: { points: number };
}

const STATUSES = ['OPEN', 'IN_PROGRESS', 'COMPLETED', 'CANCELLED'];

export default function JobDetailPage() {
  const { user, activeOrg, loading } = useRequireAuth();
  const router = useRouter();
  const jobId = typeof router.query.jobId === 'string' ? router.query.jobId : null;
  const orgId = activeOrg?.org.id ?? null;

  const [job, setJob] = useState<JobDetail | null>(null);
  const [points, setPoints] = useState<MapPoint[]>([]);
  const [live, setLive] = useState(0);
  const [liveStatus, setLiveStatus] = useState<LiveStatus | null>(null);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (!orgId || !jobId) {
      return;
    }
    api
      .get<JobDetail>(`/api/orgs/${orgId}/jobs/${jobId}`)
      .then(setJob)
      .catch((err) => setError(err.message));
    api
      .get<{ points: MapPoint[] }>(`/api/orgs/${orgId}/jobs/${jobId}/points`)
      .then((res) => setPoints(res.points))
      .catch((err) => setError(err.message));
  }, [orgId, jobId]);

  const onLivePoints = useCallback((incoming: MapPoint[]) => {
    setPoints((prev) => {
      const seen = new Set(prev.map((p) => p.id));
      const fresh = incoming.filter((p) => !seen.has(p.id));
      return fresh.length > 0 ? [...prev, ...fresh] : prev;
    });
    setLive((n) => n + incoming.length);
  }, []);

  const onStatus = useCallback((status: LiveStatus) => setLiveStatus(status), []);

  useJobStream(jobId, onLivePoints, onStatus);

  const updateStatus = async (status: string) => {
    if (!orgId || !jobId) {
      return;
    }
    try {
      setJob(await api.patch<JobDetail>(`/api/orgs/${orgId}/jobs/${jobId}`, { status }));
    } catch (err: any) {
      setError(err.message);
    }
  };

  if (loading || !user) {
    return null;
  }

  return (
    <Layout title={job ? job.ticketNumber : 'Job'}>
      {error && <p style={{ color: '#c62828' }}>{error}</p>}
      {job && (
        <>
          <div style={{ display: 'flex', alignItems: 'baseline', gap: '1rem', flexWrap: 'wrap' }}>
            <h1 style={{ margin: 0 }}>{job.ticketNumber}</h1>
            <span style={{ fontSize: '1.1rem' }}>{job.title}</span>
            <select value={job.status} onChange={(e) => updateStatus(e.target.value)} style={{ marginLeft: 'auto' }}>
              {STATUSES.map((s) => (
                <option key={s} value={s}>
                  {s}
                </option>
              ))}
            </select>
          </div>
          <p style={{ color: '#666' }}>
            {job.address && <>{job.address} · </>}
            source {job.source} · created {new Date(job.createdAt).toLocaleString()}
            {job.assignedTo && <> · assigned to {job.assignedTo.name}</>}
            {job.dueAt && <> · locate by {new Date(job.dueAt).toLocaleString()}</>}
          </p>
          {job.description && <p>{job.description}</p>}

          <div style={{ margin: '1rem 0', display: 'flex', gap: '1rem', color: '#555', flexWrap: 'wrap' }}>
            <span>
              <strong>{points.length}</strong> points
            </span>
            <span style={{ color: live > 0 ? '#388e3c' : '#999' }}>
              ● live{live > 0 ? ` (+${live} this session)` : ''}
            </span>
            {points.length > 0 && (
              <span style={{ color: '#777' }}>latest: {pointSummary(points[points.length - 1])}</span>
            )}
            {liveStatus && (
              <span style={{ color: '#1a73e8' }}>
                ● transmitter {liveStatus.serial} live ({new Date(liveStatus.recordedAt).toLocaleTimeString()})
              </span>
            )}
          </div>

          <JobMap points={points} liveStatus={liveStatus} heightPx={520} />
        </>
      )}
    </Layout>
  );
}
