<?php

declare(strict_types=1);

namespace App\Http\Requests\Api\V1;

use App\Enums\RegistrationFieldType;
use App\Models\PersonTag;
use App\Models\RegistrationFormField;
use Illuminate\Foundation\Http\FormRequest;

final class UpsertPersonFieldValuesRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    /** @return array<string, mixed> */
    public function rules(): array
    {
        return [
            'values' => ['required', 'array'],
        ];
    }

    public function withValidator($validator): void
    {
        $validator->after(function ($validator) {
            $values = $this->input('values', []);
            $event = $this->route('event');

            if (!$event || !is_array($values)) {
                return;
            }

            $fields = RegistrationFormField::where('event_id', $event->id)
                ->get()
                ->keyBy('slug');

            $orgId = $event->organisation_id;

            foreach ($values as $slug => $value) {
                $field = $fields->get($slug);

                if ($field === null) {
                    $validator->errors()->add("values.{$slug}", "Unknown field: {$slug}");
                    continue;
                }

                if ($field->is_required && ($value === null || $value === '' || $value === [])) {
                    $validator->errors()->add("values.{$slug}", "The {$slug} field is required.");
                    continue;
                }

                if ($value === null || $value === '') {
                    continue;
                }

                match ($field->field_type) {
                    RegistrationFieldType::TEXT, RegistrationFieldType::TEXTAREA => $this->validateString($validator, $slug, $value),
                    RegistrationFieldType::NUMBER => $this->validateNumber($validator, $slug, $value),
                    RegistrationFieldType::BOOLEAN => $this->validateBoolean($validator, $slug, $value),
                    RegistrationFieldType::SELECT, RegistrationFieldType::RADIO => $this->validateSingleOption($validator, $slug, $value, $field),
                    RegistrationFieldType::MULTISELECT, RegistrationFieldType::CHECKBOX => $this->validateMultiOption($validator, $slug, $value, $field),
                    RegistrationFieldType::TAG_PICKER => $this->validateTagPicker($validator, $slug, $value, $orgId),
                };
            }
        });
    }

    private function validateString($validator, string $slug, mixed $value): void
    {
        if (!is_string($value) || mb_strlen($value) > 5000) {
            $validator->errors()->add("values.{$slug}", "Must be a string (max 5000 characters).");
        }
    }

    private function validateNumber($validator, string $slug, mixed $value): void
    {
        if (!is_numeric($value)) {
            $validator->errors()->add("values.{$slug}", "Must be a number.");
        }
    }

    private function validateBoolean($validator, string $slug, mixed $value): void
    {
        if (!in_array($value, [true, false, 0, 1, '0', '1'], true)) {
            $validator->errors()->add("values.{$slug}", "Must be a boolean.");
        }
    }

    private function validateSingleOption($validator, string $slug, mixed $value, RegistrationFormField $field): void
    {
        if (!is_string($value) || !in_array($value, $field->options ?? [], true)) {
            $validator->errors()->add("values.{$slug}", "Must be one of the defined options.");
        }
    }

    private function validateMultiOption($validator, string $slug, mixed $value, RegistrationFormField $field): void
    {
        if (!is_array($value)) {
            $validator->errors()->add("values.{$slug}", "Must be an array.");
            return;
        }

        $options = $field->options ?? [];
        foreach ($value as $item) {
            if (!in_array($item, $options, true)) {
                $validator->errors()->add("values.{$slug}", "Invalid option: {$item}");
            }
        }
    }

    private function validateTagPicker($validator, string $slug, mixed $value, string $orgId): void
    {
        if (!is_array($value)) {
            $validator->errors()->add("values.{$slug}", "Must be an array of tag IDs.");
            return;
        }

        $validTagIds = PersonTag::where('organisation_id', $orgId)
            ->where('is_active', true)
            ->pluck('id')
            ->all();

        foreach ($value as $tagId) {
            if (!in_array($tagId, $validTagIds, true)) {
                $validator->errors()->add("values.{$slug}", "Invalid tag ID: {$tagId}");
            }
        }
    }
}