import { useJobs, useToggleJob, useTriggerJob } from '../../hooks/useAdmin';
import type { JobCategory, JobStatus } from '../../api/admin';
import { SkeletonTable } from '../ui/Skeleton';

function formatNextRun(iso: string | null): string {
  if (!iso) return '—';
  const d = new Date(iso);
  const now = new Date();
  const diffMs = d.getTime() - now.getTime();
  if (diffMs < 0) return 'imminent';
  const mins = Math.round(diffMs / 60_000);
  if (mins < 60) return `in ${mins}m`;
  const hrs = Math.round(mins / 60);
  if (hrs < 48) return `in ${hrs}h`;
  return `in ${Math.round(hrs / 24)}d`;
}

function formatAgo(iso: string | null | undefined): string {
  if (!iso) return '';
  const mins = Math.floor((Date.now() - new Date(iso).getTime()) / 60_000);
  if (mins < 1) return 'just now';
  if (mins < 60) return `${mins}m ago`;
  const hrs = Math.floor(mins / 60);
  if (hrs < 24) return `${hrs}h ago`;
  return `${Math.floor(hrs / 24)}d ago`;
}

function lastRunColor(status: string | null | undefined): string {
  if (status === 'error') return 'text-red-300';
  if (status === 'rate_limited' || status === 'deferred') return 'text-amber-300';
  return 'text-gray-500';
}

/** The four kinds of job, in the order the API already sorts them. A job whose
 *  category the client does not recognise still renders, under "Other" — better
 *  a stray section than a job that silently vanishes from the admin page. */
const SECTIONS: { key: JobCategory; title: string; hint: string }[] = [
  {
    key: 'pipeline',
    title: 'Pipelines',
    hint: 'own schedule · run their steps in order',
  },
  {
    key: 'pipeline_step',
    title: 'Pipeline steps',
    hint: 'no timer of their own · still triggerable individually',
  },
  {
    key: 'scheduled',
    title: 'Standalone scheduled',
    hint: 'own schedule · independent of any pipeline',
  },
  { key: 'manual', title: 'Manual only', hint: 'never fires on its own' },
];

/** One consistent answer per job: its own timer, its parent's, or "manual only".
 *  A step has no schedule of its own, so reporting one was the original bug. */
function NextRun({ job, labels }: { job: JobStatus; labels: Record<string, string> }) {
  const muted = 'text-[11px] text-gray-500';
  if (job.next_run_source === 'manual_only') {
    return <span className={muted}>manual only</span>;
  }
  if (job.next_run_source === 'via_pipeline') {
    if (!job.via_next_run_at || !job.via_next_run_job) {
      return <span className={muted}>runs via pipeline</span>;
    }
    return (
      <span className={muted}>
        Next via {labels[job.via_next_run_job] ?? job.via_next_run_job}{' '}
        {formatNextRun(job.via_next_run_at)}
      </span>
    );
  }
  if (!job.next_run_at) return null;
  return <span className={muted}>Next run {formatNextRun(job.next_run_at)}</span>;
}

/** Membership, shown rather than nested: a step can belong to several pipelines
 *  (data_collector is in all four), so duplicating rows under each parent would
 *  render Trigger buttons that are not distinct actions. */
function Membership({ job, labels }: { job: JobStatus; labels: Record<string, string> }) {
  const name = (id: string) => labels[id] ?? id;
  if (job.category === 'pipeline' && job.steps?.length) {
    return (
      <div className="mt-1 text-[11px] leading-relaxed text-gray-600">
        {job.steps.map(name).join(' → ')}
      </div>
    );
  }
  if (job.category === 'pipeline_step' && job.pipelines?.length) {
    return (
      <div className="mt-1 text-[11px] leading-relaxed text-gray-600">
        runs in: {job.pipelines.map(name).join(', ')}
      </div>
    );
  }
  return null;
}

interface JobCardProps {
  job: JobStatus;
  labels: Record<string, string>;
  anyJobRunning: boolean;
  runningJobLabel?: string;
  onToggle: (job: JobStatus) => void;
  onTrigger: (job: JobStatus) => void;
  togglePending: boolean;
  triggerPending: boolean;
}

function JobCard({
  job,
  labels,
  anyJobRunning,
  runningJobLabel,
  onToggle,
  onTrigger,
  togglePending,
  triggerPending,
}: JobCardProps) {
  return (
    <div className="glass p-4 glass-hover">
      <div className="flex flex-wrap items-center justify-between gap-4">
        <div className="flex items-center gap-3">
          {/* Status dot */}
          <span
            className={`inline-block h-2.5 w-2.5 rounded-full shrink-0 ${
              job.running
                ? 'bg-blue-400 shadow-lg shadow-blue-400/40'
                : job.enabled
                ? 'bg-emerald-400 shadow-lg shadow-emerald-400/40'
                : 'bg-gray-500'
            }`}
          />
          <div>
            <span className="text-sm font-medium text-gray-200">{job.label}</span>
            <div className="mt-0.5 flex flex-wrap items-center gap-3">
              {/* Live state only — a persisted error must not read as the
                  current status forever, so this never consults last_run_*. */}
              <span
                className={`text-[11px] font-medium ${
                  job.running
                    ? 'text-blue-300'
                    : job.runtime_status === 'rate_limited' || job.runtime_status === 'deferred'
                      ? 'text-amber-300'
                      : job.runtime_status === 'error'
                        ? 'text-red-300'
                        : job.enabled
                          ? 'text-emerald-400'
                          : 'text-gray-500'
                }`}
              >
                {job.running
                  ? 'Running'
                  : job.runtime_status === 'rate_limited'
                    ? 'Paused (rate-limited)'
                    : job.runtime_status === 'deferred'
                      ? 'Deferred (retrying)'
                    : job.runtime_status === 'error'
                      ? 'Last run error'
                      : job.enabled
                        ? 'Active'
                        : 'Inactive'}
              </span>
              {job.enabled && <NextRun job={job} labels={labels} />}
              {!job.registered && (
                <span className="text-[11px] text-red-400">Not registered</span>
              )}
            </div>
            <Membership job={job} labels={labels} />
            {/* Persisted, so this survives a deploy — unlike runtime_* above. */}
            {!job.running && job.last_run_at && (
              <div className={`mt-1 text-[11px] ${lastRunColor(job.last_run_status)}`}>
                Last run {formatAgo(job.last_run_at)}
                {job.last_run_status ? ` · ${job.last_run_status}` : ''}
                {job.last_run_message ? ` — ${job.last_run_message}` : ''}
              </div>
            )}
            {!job.running && !job.last_run_at && (
              <div className="mt-1 text-[11px] text-gray-600">No run recorded yet</div>
            )}
            {job.running && (
              <div className="mt-2 space-y-1.5">
                <div className="flex items-center justify-between text-[11px] text-gray-400">
                  <span>
                    {job.runtime_processed ?? 0}
                    {typeof job.runtime_total === 'number' ? ` / ${job.runtime_total}` : ''}
                    {' '}processed
                  </span>
                  {typeof job.runtime_progress_pct === 'number' && (
                    <span>{Math.max(0, Math.min(100, job.runtime_progress_pct)).toFixed(0)}%</span>
                  )}
                </div>
                <div className="h-1.5 w-56 overflow-hidden rounded-full bg-slate-700/80">
                  <div
                    className="h-full bg-blue-400 transition-all duration-500"
                    style={{
                      width: `${
                        typeof job.runtime_progress_pct === 'number'
                          ? Math.max(5, Math.min(100, job.runtime_progress_pct))
                          : 30
                      }%`,
                    }}
                  />
                </div>
                {job.runtime_current_ticker && (
                  <div className="text-[11px] text-gray-500">Current: {job.runtime_current_ticker}</div>
                )}
              </div>
            )}
          </div>
        </div>

        <div className="flex items-center gap-2">
          <button
            type="button"
            onClick={() => onToggle(job)}
            disabled={togglePending}
            className={`rounded-lg border px-3 py-1.5 text-xs transition-all duration-200 disabled:opacity-50 ${
              job.enabled
                ? 'border-red-500/20 bg-red-500/10 text-red-400 hover:bg-red-500/20'
                : 'border-emerald-500/20 bg-emerald-500/10 text-emerald-400 hover:bg-emerald-500/20'
            }`}
          >
            {job.enabled ? 'Disable' : 'Enable'}
          </button>
          <button
            type="button"
            onClick={() => onTrigger(job)}
            disabled={triggerPending || !job.enabled || anyJobRunning}
            className="btn-primary px-3 py-1.5 text-xs disabled:cursor-not-allowed disabled:opacity-50"
          >
            <span>
              {job.running
                ? 'Running…'
                : triggerPending
                  ? 'Triggering…'
                  : anyJobRunning
                    ? 'Blocked'
                    : 'Trigger Now'}
            </span>
          </button>
        </div>
      </div>
      {anyJobRunning && !job.running && (
        <div className="mt-2 text-[11px] text-gray-500">
          Manual trigger blocked while {runningJobLabel ?? 'another job'} is running.
        </div>
      )}
    </div>
  );
}

export function JobControls() {
  const { data: jobs, isLoading } = useJobs();
  const toggleJob = useToggleJob();
  const triggerJob = useTriggerJob();
  const all = jobs ?? [];
  // Job id -> display label, so a step can name its parent pipeline.
  const labels = Object.fromEntries(all.map((job) => [job.name, job.label]));
  const anyJobRunning = all.some((job) => job.running);
  const runningJob = all.find((job) => job.running);
  const pausedJob = all.find((job) => !job.running && job.runtime_status === 'rate_limited');

  if (isLoading) return <SkeletonTable rows={4} cols={3} />;

  const known = new Set<string>(SECTIONS.map((s) => s.key));
  const groups: { key: string; title: string; hint: string; jobs: JobStatus[] }[] = [
    ...SECTIONS.map((section) => ({
      ...section,
      jobs: all.filter((job) => job.category === section.key),
    })),
    {
      key: 'other',
      title: 'Other',
      hint: 'uncategorised',
      jobs: all.filter((job) => !job.category || !known.has(job.category)),
    },
  ];

  const cardProps = {
    labels,
    anyJobRunning,
    runningJobLabel: runningJob?.label,
    onToggle: (job: JobStatus) =>
      toggleJob.mutate({ jobName: job.name, enabled: !job.enabled }),
    onTrigger: (job: JobStatus) => triggerJob.mutate(job.name),
    togglePending: toggleJob.isPending,
    triggerPending: triggerJob.isPending,
  };

  return (
    <div className="space-y-6">
      {runningJob && (
        <div className="rounded-xl border border-blue-400/30 bg-blue-500/10 px-4 py-3">
          <div className="flex flex-wrap items-center justify-between gap-3">
            <div>
              <div className="text-xs font-semibold text-blue-300">
                Active job: {runningJob.label}
              </div>
              <div className="mt-0.5 text-[11px] text-blue-100/80">
                Manual triggers are blocked until this run finishes.
              </div>
            </div>
            <div className="text-[11px] text-blue-200">
              {runningJob.runtime_processed ?? 0}
              {typeof runningJob.runtime_total === 'number'
                ? ` / ${runningJob.runtime_total}`
                : ''}
            </div>
          </div>
          <div className="mt-2 h-1.5 w-full overflow-hidden rounded-full bg-slate-700/80">
            <div
              className="h-full bg-blue-400 transition-all duration-500"
              style={{
                width: `${
                  typeof runningJob.runtime_progress_pct === 'number'
                    ? Math.max(5, Math.min(100, runningJob.runtime_progress_pct))
                    : 30
                }%`,
              }}
            />
          </div>
          {runningJob.runtime_current_ticker && (
            <div className="mt-1 text-[11px] text-blue-100/80">
              Current: {runningJob.runtime_current_ticker}
            </div>
          )}
          {runningJob.runtime_message && (
            <div className="mt-1 text-[11px] text-blue-100/80">{runningJob.runtime_message}</div>
          )}
        </div>
      )}

      {!runningJob && pausedJob && (
        <div className="rounded-xl border border-amber-400/30 bg-amber-500/10 px-4 py-3">
          <div className="flex flex-wrap items-center justify-between gap-3">
            <div>
              <div className="text-xs font-semibold text-amber-300">
                Last run paused: {pausedJob.label}
              </div>
              <div className="mt-0.5 text-[11px] text-amber-100/90">
                {pausedJob.runtime_message || 'Rate limit hit. The collector stopped early and will resume from last progress on the next run.'}
              </div>
            </div>
            <div className="text-[11px] text-amber-200">
              {pausedJob.runtime_processed ?? 0}
              {typeof pausedJob.runtime_total === 'number'
                ? ` / ${pausedJob.runtime_total}`
                : ''}
            </div>
          </div>
        </div>
      )}

      {groups.map(
        (group) =>
          group.jobs.length > 0 && (
            <section key={group.key} className="space-y-3">
              <h3 className="text-xs font-medium uppercase tracking-widest text-gray-500">
                {group.title}
                <span className="ml-2 num text-gray-600">{group.jobs.length}</span>
                <span className="ml-2 normal-case tracking-normal text-gray-600">
                  {group.hint}
                </span>
              </h3>
              {group.jobs.map((job) => (
                <JobCard key={job.name} job={job} {...cardProps} />
              ))}
            </section>
          ),
      )}
    </div>
  );
}
