<?php

namespace Laravel\Prompts\Themes\Default;

use Laravel\Prompts\SearchPrompt;
use Laravel\Prompts\Themes\Contracts\Scrolling;

class SearchPromptRenderer extends Renderer implements Scrolling
{
    use Concerns\DrawsBoxes;
    use Concerns\DrawsScrollbars;

    /**
     * Render the suggest prompt.
     */
    public function __invoke(SearchPrompt $prompt): string
    {
        $maxWidth = $prompt->terminal()->cols() - 6;

        return match ($prompt->state) {
            'submit' => $this
                ->box(
                    $this->dim($this->truncate($prompt->label, $prompt->terminal()->cols() - 6)),
                    $this->truncate($prompt->label(), $maxWidth),
                ),

            'cancel' => $this
                ->box(
                    $this->dim($this->truncate($prompt->label, $prompt->terminal()->cols() - 6)),
                    $this->strikethrough($this->dim($this->truncate($prompt->searchValue() ?: $prompt->placeholder, $maxWidth))),
                    color: 'red',
                )
                ->error($prompt->cancelMessage),

            'error' => $this
                ->box(
                    $this->truncate($prompt->label, $prompt->terminal()->cols() - 6),
                    $prompt->valueWithCursor($maxWidth),
                    $this->renderOptions($prompt),
                    color: 'yellow',
                )
                ->warning($this->truncate($prompt->error, $prompt->terminal()->cols() - 5)),

            'searching' => $this
                ->box(
                    $this->cyan($this->truncate($prompt->label, $prompt->terminal()->cols() - 6)),
                    $this->valueWithCursorAndSearchIcon($prompt, $maxWidth),
                    $this->renderOptions($prompt),
                )
                ->hint($prompt->hint),

            default => $this
                ->box(
                    $this->cyan($this->truncate($prompt->label, $prompt->terminal()->cols() - 6)),
                    $prompt->valueWithCursor($maxWidth),
                    $this->renderOptions($prompt),
                )
                ->when(
                    $prompt->hint,
                    fn () => $this->hint($prompt->hint),
                    fn () => $this->newLine() // Space for errors
                )
                ->spaceForDropdown($prompt)
        };
    }

    /**
     * Render the value with the cursor and a search icon.
     */
    protected function valueWithCursorAndSearchIcon(SearchPrompt $prompt, int $maxWidth): string
    {
        return preg_replace(
            '/\s$/',
            $this->cyan('…'),
            $this->pad($prompt->valueWithCursor($maxWidth - 1).'  ', min($this->longest($prompt->matches(), padding: 2), $maxWidth))
        );
    }

    /**
     * Render a spacer to prevent jumping when the suggestions are displayed.
     */
    protected function spaceForDropdown(SearchPrompt $prompt): self
    {
        if ($prompt->searchValue() !== '') {
            return $this;
        }

        $this->newLine(max(
            0,
            min($prompt->scroll, $prompt->terminal()->lines() - 7) - count($prompt->matches()),
        ));

        if ($prompt->matches() === []) {
            $this->newLine();
        }

        return $this;
    }

    /**
     * Render the options.
     */
    protected function renderOptions(SearchPrompt $prompt): string
    {
        if ($prompt->searchValue() !== '' && empty($prompt->matches())) {
            return $this->gray('  '.($prompt->state === 'searching' ? 'Searching...' : 'No results.'));
        }

        return $this->scrollbar(
            collect($prompt->visible())
                ->map(fn ($label) => $this->truncate($label, $prompt->terminal()->cols() - 10))
                ->map(function ($label, $key) use ($prompt) {
                    $index = array_search($key, array_keys($prompt->matches()));

                    return $prompt->highlighted === $index
                        ? "{$this->cyan('›')} {$label}  "
                        : "  {$this->dim($label)}  ";
                })
                ->values(),
            $prompt->firstVisible,
            $prompt->scroll,
            count($prompt->matches()),
            min($this->longest($prompt->matches(), padding: 4), $prompt->terminal()->cols() - 6)
        )->implode(PHP_EOL);
    }

    /**
     * The number of lines to reserve outside of the scrollable area.
     */
    public function reservedLines(): int
    {
        return 7;
    }
}

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