<?php

namespace App\Http\Requests\Back;

use App\Enums\Contact\ContactFormType;
use App\Enums\ElementPositionEnum;
use App\Enums\DynamicFieldTypes;
use App\Enums\StaticRoutesEnum;
use App\Models\PageConfig;
use App\Rules\Video;
use App\Traits\Requests\HasInertiaPicture;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;
use Illuminate\Validation\Rules\Enum;
use Uwil\LaravelCommon\Helpers\ToolboxHelper;
use Uwil\LaravelCommon\Rules\WysiwygLength;

abstract class UpdateDynamicFieldRequest extends FormRequest
{
    use HasInertiaPicture;

    /** @var \App\Models\PageConfig|null $configModel */
    private $configModel = null;

    /** @var string $fieldName */
    private $fieldName = "content";

    /**
     * Determine if the user is authorized to make this request.
     *
     * @return boolean
     */
    public function authorize(): bool
    {
        return auth('backend')->check();
    }

    /**
     * Prepare the data for validation.
     *
     * @return void
     */
    protected function prepareForValidation(): void
    {
        $this->configModel = PageConfig::query()->whereKey($this->input('config_id'))->firstOrFail();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules(): array
    {
        // phpcs:enable
        $rules = [];
        foreach ($this->configModel->config as $input) {
            $rules = array_merge($rules, $this->recursiveRules($input, $this->fieldName));
        } //end foreach
        return $rules;
    }

    /**
     * Get rules from a specific input type.
     *
     * @param array  $input
     * @param string $prefix
     * @return array
     * @throws \UnexpectedValueException Unrecognized dynamic type.
     * @phpcs:disable Generic.Metrics.CyclomaticComplexity
     */
    private function recursiveRules(array &$input, string $prefix): array
    {
        // phpcs:enable
        $rules   = [];
        $ruleKey = "$prefix.$input[key]";
        switch ($input['type']) {
            case DynamicFieldTypes::string->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::string->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::textarea->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::textarea->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::wysiwyg->value:
                $defaultRules = explode('|', DynamicFieldTypes::wysiwyg->getValidation());
                $wysiwygRules = $this->compileValidate(DynamicFieldTypes::wysiwyg->getValidation(), $input);

                // Get the minimum and maximum values of the ‘between’ rule and
                // remove them from the rules so that our custom rule WysiwygLength can apply it.
                $defaults                      = $this->extractMinMax($defaultRules);
                ['min' => $min, 'max' => $max] = $this->extractMinMax($wysiwygRules, $defaults);
                $newWysiwygRules               = array_values(array_filter($wysiwygRules, fn($rule) => !(
                    is_string($rule) && preg_match('/^(min|max|between):/', $rule)
                )));

                $rules = array_merge($rules, [
                    $ruleKey => array_merge($newWysiwygRules, [
                        new WysiwygLength($min, $max),
                    ])
                ]);
                break;
            case DynamicFieldTypes::number->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::number->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::boolean->value:
                $all      = $this->all();
                $modified = $this->castBooleanFields($all);
                $this->merge($modified);
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::boolean->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::url->value:
                $rules = array_merge($rules, [
                    $ruleKey => array_merge(explode("|", DynamicFieldTypes::url->getValidation()), [
                        // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundInExtendedClassBeforeLastUsed
                        function ($attribute, $value, $fail) {
                            try {
                                ToolboxHelper::assertNoInternalUrls($attribute, $value);
                                ToolboxHelper::assertNoInternalBoUrls($attribute, $value);
                            } catch (ValidationException $e) {
                                $fail(collect($e->errors())->first()[0]);
                            }
                        }
                    ]),
                ]);
                break;
            case DynamicFieldTypes::email->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::email->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::image->value:
                $imgRules = $this->compileValidate(DynamicFieldTypes::image->getValidation(), $input);
                $rules    = array_merge($rules, [
                    $ruleKey => $this->pictureRules(implode("|", $imgRules)),
                ]);
                break;
            case DynamicFieldTypes::list->value:
                $rules = array_merge($rules, [
                    "$ruleKey.*.order" => "required|numeric|min:1",
                    $ruleKey           => $this->compileValidate(DynamicFieldTypes::list->getValidation(), $input),
                ]);
                foreach ($input['children'] as $key => $children) {
                    $rules = array_merge($rules, $this->recursiveRules($children, $ruleKey . ".*"));
                }
                break;
            case DynamicFieldTypes::file->value:
                $imgRules = $this->compileValidate(DynamicFieldTypes::file->getValidation(), $input);
                $rules    = array_merge($rules, [
                    $ruleKey => $this->pictureRules(implode("|", $imgRules)),
                ]);
                break;
            case DynamicFieldTypes::vimeoid->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::vimeoid->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::youtubeid->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::youtubeid->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::date->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::date->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::color->value:
                $rules = array_merge($rules, [
                    $ruleKey => $this->compileValidate(DynamicFieldTypes::color->getValidation(), $input)
                ]);
                break;
            case DynamicFieldTypes::model->value:
                // Set a new rule key for the model name.
                $ruleKeyReserved = preg_replace('/([^.\s]+)$/', 'reserved_$1', $ruleKey);
                $rules           = array_merge($rules, [
                    $ruleKey         => $this->compileValidate(DynamicFieldTypes::model->getValidation(), $input),
                    $ruleKeyReserved => 'required|string|between:3,255',
                ]);
                break;
            case DynamicFieldTypes::staticroute->value:
                $rules = array_merge($rules, [
                    $ruleKey => array_merge(
                        $this->compileValidate(DynamicFieldTypes::staticroute->getValidation(), $input),
                        [new Enum(StaticRoutesEnum::class)],
                    ),
                ]);
                break;
            // Specific inputs.
            case DynamicFieldTypes::position->value:
                $rules = array_merge($rules, [
                    $ruleKey => array_merge(
                        $this->compileValidate(DynamicFieldTypes::position->getValidation(), $input),
                        [new Enum(ElementPositionEnum::class)],
                    ),
                ]);
                break;
            case DynamicFieldTypes::contactform->value:
                $rules = array_merge($rules, [
                    $ruleKey => array_merge(
                        $this->compileValidate(DynamicFieldTypes::position->getValidation(), $input),
                        [new Enum(ContactFormType::class)],
                    ),
                ]);
                break;
            case DynamicFieldTypes::video->value:
                $rules = array_merge($rules, [
                    $ruleKey => new Video(),
                ]);
                break;
            default:
                throw new \UnexpectedValueException("Unrecognized dynamic type: " . ($input['type'] ?? 'null'));
        } //end switch
        return $rules;
    }

    /**
     * Get custom attributes for validator errors.
     *
     * @return array
     */
    public function attributes(): array
    {
        $attributes = [];
        foreach ($this->configModel->config as $input) {
            $attributes = array_merge($attributes, $this->recursiveAttributes($input, $this->fieldName));
        }
        return $attributes;
    }

    /**
     * Get attributes from a specific input type.
     *
     * @param array  $input
     * @param string $prefix
     * @return array
     */
    private function recursiveAttributes(array &$input, string $prefix): array
    {
        $attributes   = [];
        $attributeKey = sprintf("%s.%s", $prefix, $input['key']);
        $attributes   = array_merge($attributes, [$attributeKey => Str::lower($input['label'])]);
        if (isset($input['children'])) {
            foreach ($input['children'] as $key => $children) {
                $attributes = array_merge($attributes, $this->recursiveAttributes($children, $attributeKey . ".*"));
            }
        }
        return $attributes;
    }

    /**
     * Merge native validations and custom validations.
     *
     * @param string|array $defaultValidations
     * @param array        $input
     * @return array
     */
    private function compileValidate(string|array $defaultValidations, array $input): array
    {
        $newValidations = $this->mergeValidations($defaultValidations, $input);

        // Get unique rule and priorise important rules first.
        $rules = \collect($newValidations)->unique()->sort(function ($valueA, $valueB) {
            $valueA = $this->ruleHasToComeFirst($valueA);
            $valueB = $this->ruleHasToComeFirst($valueB);
            return $valueA - $valueB;
        });

        // Conditions the rules.
        $hasRequire     = $rules->first(fn($rule) => $rule === 'required') ? true : false;
        $hasRequireCond = $rules->first(fn($rule) => \strpos($rule, 'required_') !== false) ? true : false;
        $hasNullable    = $rules->first(fn($rule) => \strpos($rule, 'nullable') !== false) ? true : false;
        $hasSometime    = $rules->first(fn($rule) => \strpos($rule, 'sometimes') !== false) ? true : false;
        $hasPresent     = $rules->first(fn($rule) => \strpos($rule, 'present') !== false) ? true : false;

        if ($hasRequire and ($hasRequireCond or $hasNullable or $hasSometime or $hasPresent)) {
            $rules = $rules->reject(fn($rule) => $rule === 'required');
        }

        return $rules->all();
    }

    /**
     * Merge new validations into default validations.
     *
     * @param string|array $defaultValidations
     * @param array        $input
     * @return array
     */
    private function mergeValidations(string|array $defaultValidations, array $input): array
    {
        if (\is_string($defaultValidations)) {
            $defaultValidations = explode('|', $defaultValidations);
        }
        /** @var array|string $inputValidations */
        $inputValidations = \collect($input)->get('validation', $input);
        $inputValidations = \is_string($inputValidations) ? explode('|', $inputValidations) : $inputValidations;

        foreach ($inputValidations as $validate) {
            // Split a string by a special character.
            $parts = explode(':', $validate, 2);

            // Check if there is a special character.
            if (count($parts) > 1) {
                [$ruleName, $ruleValue] = $parts;

                // Deletes any old rule that starts with “ruleName:”.
                $defaultValidations = collect($defaultValidations)
                    ->reject(function ($existingRule) use ($ruleName) {
                        return is_string($existingRule) && str_starts_with($existingRule, sprintf('%s:', $ruleName));
                    })
                    ->values()
                    ->all();

                // Add the new rule.
                $defaultValidations[] = $validate;
            } else {
                // Check if rule without special character already exist.
                if (!in_array($validate, $defaultValidations)) {
                    // Add the input rule.
                    $defaultValidations[] = $validate;
                }
            }
        } //end foreach
        return $defaultValidations;
    }

    /**
     * Does the rule need to come first ?
     *
     * @param string $rule
     * @return integer
     */
    private function ruleHasToComeFirst(string $rule): int
    {
        $rule    = \collect(\explode(':', $rule, 2))->filter()->first(null, '');
        $rules   = \collect([
            'required_if',
            'required_unless',
            'required_with',
            'required_with_all',
            'required_without',
            'required_without_all',
            'required_with_all',
            'missing',
            'missing_if',
            'missing_unless',
            'missing_with',
            'missing_with_all',
            'nullable',
            'sometimes',
            'present',
            'required'
        ]);
        $itemKey = $rules->search(fn(string $firstRule) =>  \strpos($rule, $firstRule) === 0);
        if (\is_bool($itemKey)) {
            return $rules->count() + 1;
        }
        return $itemKey;
    }

    /**
     * Recursively traverses an array and converts it to Boolean
     * all values whose key begins with “boolean_”.
     *
     * @param array $data
     * @return array
     */
    private function castBooleanFields(array $data): array
    {
        foreach ($data as $key => $value) {
            // If the value is an array, recursive method.
            if (is_array($value)) {
                $data[$key] = $this->castBooleanFields($value);
                continue;
            }
            // Check if the key start with the pattern enum_.
            if (str_starts_with($key, sprintf("%s_", DynamicFieldTypes::boolean->name))) {
                // Accepts boolean-like values (true/false, one/zero, on/off) as strings or numbers.
                $data[$key] = filter_var($value, FILTER_VALIDATE_BOOLEAN);
            }
        }
        return $data;
    }

    /**
     * Extract min and max values from laravel validation.
     *
     * @param array      $rules
     * @param array|null $fallback
     * @return array
     */
    private function extractMinMax(array $rules, ?array $fallback = null): array
    {
        $min = $fallback['min'] ?? null;
        $max = $fallback['max'] ?? null;

        foreach ($rules as $rule) {
            if (str_starts_with($rule, 'between:')) {
                [$min, $max] = array_map(
                    'intval',
                    explode(',', substr($rule, 8))
                );
                return compact('min', 'max');
            }

            if (str_starts_with($rule, 'min:')) {
                $min = (int) substr($rule, 4);
            }

            if (str_starts_with($rule, 'max:')) {
                $max = (int) substr($rule, 4);
            }
        }

        return compact('min', 'max');
    }
}