import type { JSX } from 'solid-js';
import { createEffect, createMemo, createSignal, Match, Switch } from 'solid-js';

import { FilterPanel } from '@/components/FilterPanel';
import { OpportunityTable } from '@/components/OpportunityTable';
import { buttonPrimary } from '@/components/styles';
import { ThemeToggle } from '@/components/ThemeToggle';
import { ToastList } from '@/components/ToastList';
import type { OpportunityFilters } from '@/lib/filterOpportunities';
import { emptyFilters, filterOpportunities, statusOptions } from '@/lib/filterOpportunities';
import { formatCount } from '@/lib/format';
import { createLiveUpdates } from '@/primitives/createLiveUpdates';
import { createClassifications, createOpportunities } from '@/primitives/createOpportunities';
import { createOpportunityAnnotations } from '@/primitives/createOpportunityAnnotations';
import { createTheme } from '@/primitives/createTheme';
import { createToasts } from '@/primitives/createToasts';

const statePanel = 'rounded-[10px] border border-line bg-surface px-6 py-12 text-center';

/** The page: the filters, the table of opportunities, and toasts for errors. */
export function App(): JSX.Element {
  const toasts = createToasts();
  const opportunities = createOpportunities();
  const classifications = createClassifications();
  const annotations = createOpportunityAnnotations(opportunities.items, toasts.show);
  createLiveUpdates({ opportunities, classifications, annotations });
  const theme = createTheme();
  const [filters, setFilters] = createSignal<OpportunityFilters>(emptyFilters());

  const statuses = createMemo(() => statusOptions(opportunities.items()));
  // annotations.get reads from a store, so hiding an opportunity re-runs this.
  const rows = createMemo(() =>
    filterOpportunities(opportunities.items(), filters(), annotations.get),
  );
  const clear = (): void => {
    setFilters(emptyFilters());
  };

  // Only the rows shown are hidden: those a filter leaves out keep their
  // marks, and come back as they were when it's cleared.
  const hideable = createMemo(() =>
    rows()
      .map((opportunity) => opportunity.uuid)
      .filter((uuid) => !annotations.get(uuid).hidden),
  );
  const hideAllVisible = (): void => {
    const uuids = hideable();
    const count =
      uuids.length === 1 ? 'this opportunity' : `these ${formatCount(uuids.length)} opportunities`;
    if (window.confirm(`Hide ${count}?`)) annotations.hideAll(uuids);
  };

  // A failed load is shown where the list would be, with a retry, and as a
  // toast, so it's seen wherever the user is looking.
  createEffect(() => {
    const err = opportunities.error();
    if (err) toasts.show(`Opportunities didn't load: ${err.message}`);
  });
  createEffect(() => {
    const err = classifications.error();
    if (err) toasts.show(`Classifications didn't load: ${err.message}`);
  });

  return (
    <div class="mx-auto max-w-[1440px] px-3 pt-4 pb-12 sm:px-6 sm:pt-7 sm:pb-16">
      <header class="mb-5 flex items-center justify-between gap-4">
        <h1 class="text-[1.75rem] font-bold tracking-tight">Opportunities</h1>
        <ThemeToggle theme={theme.theme()} onChange={theme.setTheme} />
      </header>

      <FilterPanel
        filters={filters()}
        onChange={setFilters}
        onClear={clear}
        statuses={statuses()}
        classifications={classifications.items()}
        isLoadingClassifications={classifications.isLoading()}
        classificationsError={classifications.error()}
        onRetryClassifications={classifications.reload}
        shown={rows().length}
        total={opportunities.items().length}
        hideable={hideable().length}
        onHideAll={hideAllVisible}
      />

      <main>
        <Switch
          fallback={
            <OpportunityTable
              opportunities={rows()}
              annotations={annotations}
              onError={toasts.show}
            />
          }
        >
          <Match when={opportunities.isLoading() && opportunities.items().length === 0}>
            <p class={`${statePanel} text-muted`}>Loading opportunities…</p>
          </Match>
          <Match when={opportunities.error()}>
            {(err) => (
              <div class={`${statePanel} text-danger`} role="alert">
                <p class="mb-3">Opportunities didn't load: {err().message}</p>
                <button type="button" class={buttonPrimary} onClick={opportunities.reload}>
                  Try again
                </button>
              </div>
            )}
          </Match>
          <Match when={opportunities.items().length === 0}>
            <p class={`${statePanel} text-muted`}>There are no opportunities yet.</p>
          </Match>
          <Match when={rows().length === 0}>
            <div class={`${statePanel} text-muted`}>
              <p class="mb-3">No opportunities match these filters.</p>
              <button type="button" class={buttonPrimary} onClick={clear}>
                Clear filters
              </button>
            </div>
          </Match>
        </Switch>
      </main>

      <ToastList toasts={toasts.items()} onDismiss={toasts.dismiss} />
    </div>
  );
}