<?php

namespace Laravel\Prompts;

use Closure;
use Illuminate\Support\Collection;
use InvalidArgumentException;

class SelectPrompt extends Prompt
{
    use Concerns\Scrolling;

    /**
     * The options for the select prompt.
     *
     * @var array<int|string, string>
     */
    public array $options;

    /**
     * Create a new SelectPrompt instance.
     *
     * @param  array<int|string, string>|Collection<int|string, string>  $options
     */
    public function __construct(
        public string $label,
        array|Collection $options,
        public int|string|null $default = null,
        public int $scroll = 5,
        public mixed $validate = null,
        public string $hint = '',
        public bool|string $required = true,
        public ?Closure $transform = null,
    ) {
        if ($this->required === false) {
            throw new InvalidArgumentException('Argument [required] must be true or a string.');
        }

        $this->options = $options instanceof Collection ? $options->all() : $options;

        if ($this->default) {
            if (array_is_list($this->options)) {
                $this->initializeScrolling(array_search($this->default, $this->options) ?: 0);
            } else {
                $this->initializeScrolling(array_search($this->default, array_keys($this->options)) ?: 0);
            }

            $this->scrollToHighlighted(count($this->options));
        } else {
            $this->initializeScrolling(0);
        }

        $this->on('key', fn ($key) => match ($key) {
            Key::UP, Key::UP_ARROW, Key::LEFT, Key::LEFT_ARROW, Key::SHIFT_TAB, Key::CTRL_P, Key::CTRL_B, 'k', 'h' => $this->highlightPrevious(count($this->options)),
            Key::DOWN, Key::DOWN_ARROW, Key::RIGHT, Key::RIGHT_ARROW, Key::TAB, Key::CTRL_N, Key::CTRL_F, 'j', 'l' => $this->highlightNext(count($this->options)),
            Key::oneOf([Key::HOME, Key::CTRL_A], $key) => $this->highlight(0),
            Key::oneOf([Key::END, Key::CTRL_E], $key) => $this->highlight(count($this->options) - 1),
            Key::ENTER => $this->submit(),
            default => null,
        });
    }

    /**
     * Get the selected value.
     */
    public function value(): int|string|null
    {
        if (static::$interactive === false) {
            return $this->default;
        }

        if (array_is_list($this->options)) {
            return $this->options[$this->highlighted] ?? null;
        } else {
            return array_keys($this->options)[$this->highlighted];
        }
    }

    /**
     * Get the selected label.
     */
    public function label(): ?string
    {
        if (array_is_list($this->options)) {
            return $this->options[$this->highlighted] ?? null;
        } else {
            return $this->options[array_keys($this->options)[$this->highlighted]] ?? null;
        }
    }

    /**
     * The currently visible options.
     *
     * @return array<int|string, string>
     */
    public function visible(): array
    {
        return array_slice($this->options, $this->firstVisible, $this->scroll, preserve_keys: true);
    }

    /**
     * Determine whether the given value is invalid when the prompt is required.
     */
    protected function isInvalidWhenRequired(mixed $value): bool
    {
        return $value === null;
    }
}

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