<?php

declare(strict_types=1);

namespace App\Framework\View\Components;

use App\Framework\View\ValueObjects\HtmlAttributes;
use App\Framework\View\ValueObjects\HtmlElement;
use App\Framework\View\ValueObjects\HtmlTag;
use App\Framework\View\ValueObjects\StandardHtmlElement;
use App\Framework\View\ValueObjects\TagName;

final readonly class FormSelect implements HtmlElement
{
    public HtmlTag $tag;

    public HtmlAttributes $attributes;

    public string $content;

    /**
     * @param array<string, string> $options Key-value pairs for options
     */
    public function __construct(
        public string $name,
        public array $options,
        public ?string $selected = null,
        public ?string $label = null,
        public ?string $id = null,
        public ?string $placeholder = null,
        public bool $required = false,
        public bool $disabled = false,
        public bool $multiple = false,
        public ?string $errorMessage = null,
        public HtmlAttributes $additionalAttributes = new HtmlAttributes()
    ) {
        $this->tag = new HtmlTag(TagName::DIV);
        $this->attributes = HtmlAttributes::empty()->withClass('form-group');
        $this->content = $this->buildContent();
    }

    public static function create(
        string $name,
        array $options,
        ?string $label = null
    ): self {
        return new self(name: $name, options: $options, label: $label);
    }

    public function withSelected(string $selected): self
    {
        return new self(
            name: $this->name,
            options: $this->options,
            selected: $selected,
            label: $this->label,
            id: $this->id,
            placeholder: $this->placeholder,
            required: $this->required,
            disabled: $this->disabled,
            multiple: $this->multiple,
            errorMessage: $this->errorMessage,
            additionalAttributes: $this->additionalAttributes
        );
    }

    public function withRequired(bool $required = true): self
    {
        return new self(
            name: $this->name,
            options: $this->options,
            selected: $this->selected,
            label: $this->label,
            id: $this->id,
            placeholder: $this->placeholder,
            required: $required,
            disabled: $this->disabled,
            multiple: $this->multiple,
            errorMessage: $this->errorMessage,
            additionalAttributes: $this->additionalAttributes
        );
    }

    public function withMultiple(bool $multiple = true): self
    {
        return new self(
            name: $this->name,
            options: $this->options,
            selected: $this->selected,
            label: $this->label,
            id: $this->id,
            placeholder: $this->placeholder,
            required: $this->required,
            disabled: $this->disabled,
            multiple: $multiple,
            errorMessage: $this->errorMessage,
            additionalAttributes: $this->additionalAttributes
        );
    }

    public function withError(string $errorMessage): self
    {
        return new self(
            name: $this->name,
            options: $this->options,
            selected: $this->selected,
            label: $this->label,
            id: $this->id,
            placeholder: $this->placeholder,
            required: $this->required,
            disabled: $this->disabled,
            multiple: $this->multiple,
            errorMessage: $errorMessage,
            additionalAttributes: $this->additionalAttributes
        );
    }

    private function buildContent(): string
    {
        $selectId = $this->id ?? "select-{$this->name}";

        $attributes = HtmlAttributes::empty()
            ->withName($this->name)
            ->withId($selectId)
            ->withClass('form-select');

        if ($this->required) {
            $attributes = $attributes->withRequired();
        }

        if ($this->disabled) {
            $attributes = $attributes->withDisabled();
        }

        if ($this->multiple) {
            $attributes = $attributes->with('multiple', 'multiple');
        }

        if ($this->errorMessage !== null) {
            $attributes = $attributes
                ->withClass('form-select--error')
                ->with('aria-invalid', 'true')
                ->with('aria-describedby', "{$selectId}-error");
        }

        // Merge additional attributes
        foreach ($this->additionalAttributes->attributes as $name => $value) {
            $attributes = $attributes->with($name, $value);
        }

        // Build options
        $optionElements = [];

        if ($this->placeholder !== null) {
            $optionElements[] = StandardHtmlElement::create(
                TagName::OPTION,
                HtmlAttributes::empty()
                    ->withValue('')
                    ->withDisabled()
                    ->withSelected(),
                $this->placeholder
            );
        }

        foreach ($this->options as $value => $text) {
            $optionAttrs = HtmlAttributes::empty()->withValue($value);

            if ($this->selected !== null && $value === $this->selected) {
                $optionAttrs = $optionAttrs->withSelected();
            }

            $optionElements[] = StandardHtmlElement::create(
                TagName::OPTION,
                $optionAttrs,
                $text
            );
        }

        $selectContent = implode('', array_map('strval', $optionElements));

        $elements = [];

        // Label
        if ($this->label !== null) {
            $labelAttrs = HtmlAttributes::empty()
                ->withClass('form-label')
                ->with('for', $selectId);

            if ($this->required) {
                $labelAttrs = $labelAttrs->withClass('form-label--required');
            }

            $elements[] = StandardHtmlElement::create(
                TagName::LABEL,
                $labelAttrs,
                $this->label
            );
        }

        // Select
        $elements[] = StandardHtmlElement::create(
            TagName::SELECT,
            $attributes,
            $selectContent
        );

        // Error message
        if ($this->errorMessage !== null) {
            $elements[] = StandardHtmlElement::create(
                TagName::SPAN,
                HtmlAttributes::empty()
                    ->withClass('form-error')
                    ->withId("{$selectId}-error")
                    ->with('role', 'alert'),
                $this->errorMessage
            );
        }

        return implode('', array_map('strval', $elements));
    }

    public function __toString(): string
    {
        return (string) StandardHtmlElement::create(
            $this->tag->name,
            $this->attributes,
            $this->content
        );
    }
}