<?php

namespace EasyCorp\Bundle\EasyAdminBundle\Form\Type;

use ArrayObject;
use EasyCorp\Bundle\EasyAdminBundle\Dto\EntityDto;
use EasyCorp\Bundle\EasyAdminBundle\Dto\FieldDto;
use EasyCorp\Bundle\EasyAdminBundle\Field\FormField;
use EasyCorp\Bundle\EasyAdminBundle\Form\EventListener\FormLayoutSubscriber;
use EasyCorp\Bundle\EasyAdminBundle\Form\Type\Layout\EaFormColumnCloseType;
use EasyCorp\Bundle\EasyAdminBundle\Form\Type\Layout\EaFormColumnOpenType;
use EasyCorp\Bundle\EasyAdminBundle\Form\Type\Layout\EaFormFieldsetCloseType;
use EasyCorp\Bundle\EasyAdminBundle\Form\Type\Layout\EaFormFieldsetOpenType;
use EasyCorp\Bundle\EasyAdminBundle\Form\Type\Layout\EaFormTabPaneCloseType;
use EasyCorp\Bundle\EasyAdminBundle\Form\Type\Layout\EaFormTabPaneOpenType;
use Symfony\Bridge\Doctrine\Form\DoctrineOrmTypeGuesser;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\OptionsResolver\Options;
use Symfony\Component\OptionsResolver\OptionsResolver;

/**
 * Custom form type that deals with some of the logic used to render the
 * forms used to create and edit EasyAdmin entities.
 *
 * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
 */
class CrudFormType extends AbstractType
{
    private DoctrineOrmTypeGuesser $doctrineOrmTypeGuesser;

    public function __construct(DoctrineOrmTypeGuesser $doctrineOrmTypeGuesser)
    {
        $this->doctrineOrmTypeGuesser = $doctrineOrmTypeGuesser;
    }

    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        /** @var EntityDto $entityDto */
        $entityDto = $options['entityDto'];
        $formTabs = [];
        $currentFormTab = null;
        $formFieldsets = [];
        $currentFormFieldset = 0;

        /** @var FieldDto $fieldDto */
        foreach ($entityDto->getFields() as $fieldDto) {
            $formFieldOptions = $fieldDto->getFormTypeOptions();

            // the names of embedded Doctrine entities contain dots, which are not allowed
            // in HTML element names. In those cases, fix the name but also update the
            // 'property_path' option to keep the original field name
            if (str_contains($fieldDto->getProperty(), '.')) {
                $formFieldOptions['property_path'] = $fieldDto->getProperty();
                $name = str_replace(['.', '[', ']', '?'], '_', $fieldDto->getProperty());
            } else {
                $name = $fieldDto->getProperty();
            }

            if (null === $formFieldType = $fieldDto->getFormType()) {
                $guessType = $this->doctrineOrmTypeGuesser->guessType($entityDto->getFqcn(), $fieldDto->getProperty());
                $formFieldType = $guessType->getType();
                $formFieldOptions = array_merge($guessType->getOptions(), $formFieldOptions);
            }

            if (EaFormPanelType::class === $formFieldType || EaFormFieldsetType::class === $formFieldType) {
                ++$currentFormFieldset;
                $formFieldsets[$currentFormFieldset] = [
                    'form_tab' => $currentFormTab ?? null,
                    'label' => $fieldDto->getLabel(),
                    'icon' => $fieldDto->getCustomOptions()->get(FormField::OPTION_ICON),
                    'collapsible' => $fieldDto->getCustomOptions()->get(FormField::OPTION_COLLAPSIBLE),
                    'collapsed' => $fieldDto->getCustomOptions()->get(FormField::OPTION_COLLAPSED),
                    'help' => $fieldDto->getHelp(),
                    'css_class' => $fieldDto->getCssClass(),
                ];

                continue;
            }

            // if the form field is a special 'tab' design element, don't add it
            // to the form. Instead, consider it the current form group (this is
            // applied to the form fields defined after it) and store its details
            // in a field to get them in form template
            if (\in_array($formFieldType, ['ea_tab', EasyAdminTabType::class], true)) {
                ++$currentFormFieldset;
                $metadata = [];
                // The first tab should be marked as active by default
                $metadata['active'] = 0 === \count($formTabs);
                $metadata['errors'] = 0;
                $metadata['id'] = $fieldDto->getProperty();
                $metadata['label'] = $fieldDto->getLabel();
                $metadata['help'] = $fieldDto->getHelp();
                $metadata[FormField::OPTION_ICON] = $fieldDto->getCustomOption(FormField::OPTION_ICON);
                $currentFormTab = (string) $fieldDto->getLabel();

                // plain arrays are not enough for tabs because they are modified in the
                // lifecycle of a form (e.g. add info about form errors). Use an ArrayObject instead.
                $formTabs[$currentFormTab] = new \ArrayObject($metadata);

                continue;
            }

            // Pass the current panel and tab down to nested CRUD forms, the nested
            // CRUD form fields are forced to use their parents panel and tab
            if (self::class === $formFieldType) {
                $formFieldOptions['ea_form_fieldset'] = $currentFormFieldset;
                $formFieldOptions['ea_form_tab'] = $currentFormTab;
            }

            $name = $this->isTypeFormField($formFieldType) ? $fieldDto->getPropertyNameWithSuffix() : $name;

            $formField = $builder->getFormFactory()->createNamedBuilder($name, $formFieldType, null, $formFieldOptions);
            $formField->setAttribute('ea_entity', $entityDto);
            $formField->setAttribute('ea_form_fieldset', $options['ea_form_fieldset'] ?? $currentFormFieldset);
            $formField->setAttribute('ea_form_tab', $options['ea_form_tab'] ?? $currentFormTab);
            $formField->setAttribute('ea_field', $fieldDto);

            $builder->add($formField);
        }

        $builder->setAttribute('ea_form_tabs', $formTabs);
        $builder->setAttribute('ea_form_fieldsets', $formFieldsets);

        $builder->addEventSubscriber(new FormLayoutSubscriber());
    }

    public function finishView(FormView $view, FormInterface $form, array $options): void
    {
        $view->vars['ea_crud_form'] = [
            'assets' => '** This variable no longer stores field assets. Instead, use "ea.crud.fieldAssets()" in your Twig template.',
            'entity' => $options['entityDto'],
            'form_tabs' => $form->getConfig()->getAttribute('ea_form_tabs'),
            'form_fieldsets' => $form->getConfig()->getAttribute('ea_form_fieldsets'),
        ];
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver
            ->setDefaults([
                'allow_extra_fields' => true,
                'data_class' => static fn (Options $options, $dataClass) => $dataClass ?? $options['entityDto']->getFqcn(),
            ])
            ->setDefined(['entityDto', 'ea_form_fieldset', 'ea_form_tab', 'ea_form_columns'])
            ->setRequired(['entityDto']);
    }

    public function getBlockPrefix(): string
    {
        return 'ea_crud';
    }

    private function isTypeFormField(?string $type): bool
    {
        if (null === $type) {
            return false;
        }

        return \in_array($type, [
            EaFormFieldsetOpenType::class,
            EaFormFieldsetCloseType::class,

            EaFormRowType::class,

            EaFormTabPaneOpenType::class,
            EaFormTabPaneCloseType::class,

            EaFormColumnOpenType::class,
            EaFormColumnCloseType::class,
        ], true);
    }
}
