import CircleQuestionMark from 'lucide-solid/icons/circle-question-mark';
import type { JSX } from 'solid-js';
import { createSignal, createUniqueId, For, Match, Show, Switch } from 'solid-js';

import { promptText, unknownPromptsText } from '@/lib/search';
import type { OpportunitySearchResults } from '@/primitives/createOpportunitySearch';
import { input, linkButton } from './styles';

interface Props {
  /** The box's text. */
  value: string;
  onInput: (value: string) => void;
  search: OpportunitySearchResults;
}

const helpButton =
  'flex rounded-md border border-line bg-surface p-1 text-ink hover:border-muted aria-expanded:border-ink';
const helpTerm = 'font-mono text-[13px] whitespace-nowrap';

/**
 * The general search box, with its help (from the backend, behind the "?"
 * button), a note on prompts the search ignored, and the search's errors.
 */
export function SearchField(props: Props): JSX.Element {
  const inputId = createUniqueId();
  const helpId = createUniqueId();
  const noteId = createUniqueId();
  const [isHelpOpen, setIsHelpOpen] = createSignal(false);

  const unknownPrompts = (): string => {
    const unknown = props.search.unknownPrompts();
    return unknown.length === 0
      ? ''
      : unknownPromptsText(unknown, props.search.help()?.prompts ?? []);
  };

  return (
    <div>
      <div class="mb-1.5 flex items-center gap-1.5">
        <label class="text-sm font-semibold" for={inputId}>
          Search
        </label>
        <button
          type="button"
          class={helpButton}
          aria-label="Search help"
          title="Search help"
          aria-expanded={isHelpOpen()}
          aria-controls={helpId}
          onClick={() => setIsHelpOpen(!isHelpOpen())}
        >
          <CircleQuestionMark size={14} strokeWidth={2} />
        </button>
      </div>
      <input
        id={inputId}
        type="search"
        class={`${input} px-3 py-2.5 text-base`}
        placeholder="Words, “phrases” and prompts such as title:"
        value={props.value}
        onInput={(e) => props.onInput(e.currentTarget.value)}
        aria-describedby={noteId}
        aria-busy={props.search.isSearching() || undefined}
      />

      <Show when={props.search.error()}>
        {(err) => (
          <p class="mt-1.5 text-sm text-danger" role="alert">
            The search didn't run: {err().message}{' '}
            <button type="button" class={linkButton} onClick={() => props.search.refresh()}>
              Try again
            </button>
          </p>
        )}
      </Show>
      <p id={noteId} class="mt-1.5 text-sm text-muted empty:hidden">
        {unknownPrompts()}
      </p>

      <div
        id={helpId}
        class="mt-2 rounded-md border border-line-soft bg-paper p-3 text-sm"
        hidden={!isHelpOpen()}
      >
        <Switch fallback={<p class="text-muted">Loading the search help…</p>}>
          <Match when={props.search.help()}>
            {(help) => (
              <>
                <dl class="grid grid-cols-[auto_1fr] gap-x-3 gap-y-1.5">
                  <For each={help().syntax}>
                    {(syntax) => (
                      <>
                        <dt class={helpTerm}>{syntax.example}</dt>
                        <dd>{syntax.help}</dd>
                      </>
                    )}
                  </For>
                </dl>
                <h3 class="mt-3 mb-1.5 font-semibold">Prompts</h3>
                <dl class="grid grid-cols-[auto_1fr] gap-x-3 gap-y-1.5">
                  <For each={help().prompts}>
                    {(prompt) => (
                      <>
                        <dt class={helpTerm}>{promptText(prompt.name)}</dt>
                        <dd>{prompt.help}</dd>
                      </>
                    )}
                  </For>
                </dl>
              </>
            )}
          </Match>
          <Match when={props.search.helpError()}>
            {(err) => (
              <p class="text-danger" role="alert">
                The search help didn't load: {err().message}{' '}
                <button type="button" class={linkButton} onClick={() => props.search.reloadHelp()}>
                  Try again
                </button>
              </p>
            )}
          </Match>
        </Switch>
      </div>
    </div>
  );
}