import { useEffect, useState } from 'react';
import { api } from '../api/client';
import type { MetadataHeroSettingsResponse } from '../api/types';
import { Banner, Button, Card, Loading, PageHead, Segments, Toggle } from '../components/ui';
import { useAction, useQuery } from '../lib/hooks';
import { useToast } from '../lib/toast';

const DEFAULT_ORDER = ['title', 'ratings', 'facts', 'summary'];

export function MetadataHeroPage() {
  const query = useQuery<MetadataHeroSettingsResponse>('/admin/api/metadata-hero');
  const { busy, run } = useAction();
  const { wrap } = useToast();
  const [order, setOrder] = useState<string[] | null>(null);
  const [timeRemainingColour, setTimeRemainingColour] = useState<'green' | 'white' | null>(null);

  useEffect(() => {
    if (order === null && query.data) setOrder(query.data.settings.contentOrder);
    if (timeRemainingColour === null && query.data) {
      setTimeRemainingColour(query.data.settings.timeRemainingColour ?? 'green');
    }
  }, [order, query.data, timeRemainingColour]);

  const selected = order ?? DEFAULT_ORDER;
  const selectedTimeRemainingColour = timeRemainingColour ?? 'green';
  const options = query.data?.options ?? [];
  const displayOptions = [
    ...selected,
    ...options.map((option) => option.value).filter((value) => !selected.includes(value)),
  ];
  const move = (value: string, offset: number) => {
    const from = selected.indexOf(value);
    const to = from + offset;
    if (from < 0 || to < 0 || to >= selected.length) return;
    const next = [...selected];
    const moved = next[from];
    next[from] = next[to]!;
    next[to] = moved!;
    setOrder(next);
  };
  const save = () => run('save', async () => {
    const response = await wrap(
      () => api.post<MetadataHeroSettingsResponse>('/admin/api/metadata-hero', {
        contentOrder: selected,
        timeRemainingColour: selectedTimeRemainingColour,
      }),
      'Metadata hero saved for every television.',
    );
    if (response) {
      query.set(response);
      setOrder(response.settings.contentOrder);
      setTimeRemainingColour(response.settings.timeRemainingColour);
    }
  });

  return (
    <>
      <PageHead
        title="Metadata hero"
        intro="Choose which content appears beside focused browse cards, and the order every television uses."
      />
      <Banner message={query.error} />
      {query.loading ? <Loading rows={2} /> : (
        <div className="metadata-hero-layout">
          <Card
            title="Content order"
            intro="Enabled blocks are drawn from top to bottom. Changes apply to the whole household."
            icon="sliders"
            footer={
              <>
                <Button variant="primary" busy={busy === 'save'} onClick={() => void save()}>
                  Save metadata hero
                </Button>
                <Button onClick={() => {
                  setOrder(DEFAULT_ORDER);
                  setTimeRemainingColour('green');
                }}>Restore defaults</Button>
              </>
            }
          >
            <div className="metadata-hero-order">
              {displayOptions.map((value) => {
                const option = options.find((entry) => entry.value === value);
                if (!option) return null;
                const index = selected.indexOf(value);
                const enabled = index >= 0;
                return (
                  <div className="metadata-hero-order-row" data-enabled={enabled || undefined} key={value}>
                    <span className="metadata-hero-order-number">{enabled ? index + 1 : '—'}</span>
                    <Toggle
                      label={option.label}
                      hint={option.description}
                      checked={enabled}
                      disabled={enabled && selected.length === 1}
                      onChange={(on) => setOrder(on
                        ? [...selected, value]
                        : selected.filter((entry) => entry !== value))}
                    />
                    <div className="metadata-hero-order-actions">
                      <Button size="sm" variant="quiet" disabled={!enabled || index === 0}
                        title={`Move ${option.label} up`} onClick={() => move(value, -1)}>↑</Button>
                      <Button size="sm" variant="quiet" disabled={!enabled || index === selected.length - 1}
                        title={`Move ${option.label} down`} onClick={() => move(value, 1)}>↓</Button>
                    </div>
                  </div>
                );
              })}
            </div>
            <div className="metadata-hero-colour">
              <b>Time-remaining text colour</b>
              <p>Choose the caption colour used beside the resume progress bar.</p>
              <Segments
                value={selectedTimeRemainingColour}
                options={[
                  { value: 'green', label: 'Emby green' },
                  { value: 'white', label: 'White' },
                ]}
                onChange={setTimeRemainingColour}
              />
            </div>
          </Card>

          <Card
            title="Television preview"
            intro="A representative focused film at launcher scale and in the current order."
            icon="tv"
          >
            <div className="metadata-hero-preview" aria-label="Metadata hero preview">
              <div className="metadata-hero-preview-copy">
                {selected.map((section) => {
                  if (section === 'title') return <div className="metadata-preview-title" key={section}>THE SOUTHERN LIGHT</div>;
                  if (section === 'ratings') return <div className="metadata-preview-ratings" key={section}><b>IMDb 8.2</b><b>TMDb 81%</b></div>;
                  if (section === 'facts') return <div className="metadata-preview-facts" key={section}>
                    <span>2026&nbsp;&nbsp; • &nbsp;&nbsp;1h 54m&nbsp;&nbsp; • &nbsp;&nbsp;M&nbsp;&nbsp; • &nbsp;&nbsp;Drama, Mystery</span>
                    <b>4K</b><b>5.1</b>
                  </div>;
                  if (section === 'recommendation_reason') return <div className="metadata-preview-reason" key={section}>Because you watched Harbour Lights</div>;
                  if (section === 'time_remaining') return <div className="metadata-preview-progress" data-colour={selectedTimeRemainingColour} key={section}>
                    <span><i /></span><b>47 minutes remaining</b>
                  </div>;
                  if (section === 'summary') return <p className="metadata-preview-summary" key={section}>A quiet coastal town follows an unexpected signal across the winter sky.</p>;
                  return null;
                })}
              </div>
              <div className="metadata-hero-preview-art" aria-hidden="true" />
            </div>
          </Card>
        </div>
      )}
    </>
  );
}