<?php

declare(strict_types=1);

namespace App\Http\Requests\Api;

use App\Http\Api\Parser\FieldParser;
use App\Http\Api\Parser\FilterParser;
use App\Http\Api\Parser\IncludeParser;
use App\Http\Api\Parser\SearchParser;
use App\Http\Api\Parser\SortParser;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Validation\Validator;

/**
 * Class SearchRequest.
 */
class SearchRequest extends ReadRequest
{
    /**
     * Get the field validation rules.
     *
     * @return array
     *
     * @noinspection PhpMissingParentCallCommonInspection
     */
    protected function getFieldRules(): array
    {
        $schema = $this->schema();
        $types = Arr::wrap($schema->type());
        $rules = $this->restrictAllowedFieldValues($schema);

        foreach ($schema->allowedIncludes() as $allowedInclude) {
            $resourceSchema = $allowedInclude->schema();
            $types[] = $resourceSchema->type();
            $rules = $rules + $this->restrictAllowedFieldValues($resourceSchema);

            foreach ($resourceSchema->allowedIncludes() as $resourceAllowedIncludePath) {
                $resourceRelationSchema = $resourceAllowedIncludePath->schema();
                $types[] = $resourceRelationSchema->type();
                $rules = $rules + $this->restrictAllowedFieldValues($resourceRelationSchema);
            }
        }

        return $rules + $this->restrictAllowedTypes(FieldParser::param(), $types);
    }

    /**
     * Get the filter validation rules.
     *
     * @return array
     */
    protected function getFilterRules(): array
    {
        $schema = $this->schema();
        $rules = [];
        $types = [];

        foreach ($schema->allowedIncludes() as $allowedInclude) {
            $resourceSchema = $allowedInclude->schema();
            $types[] = $resourceSchema->type();

            $resourceSchemaFormattedFilters = $this->getSchemaFormattedFilters($resourceSchema);
            $types = array_merge($types, $resourceSchemaFormattedFilters);

            $param = Str::of(FilterParser::param())->append('.')->append($resourceSchema->type())->__toString();
            $rules = $rules + $this->restrictAllowedTypes($param, $resourceSchemaFormattedFilters);

            foreach ($resourceSchema->allowedIncludes() as $resourceAllowedIncludePath) {
                $resourceRelationSchema = $resourceAllowedIncludePath->schema();
                $types[] = $resourceRelationSchema->type();

                $relationSchemaFormattedFilters = $this->getSchemaFormattedFilters($resourceRelationSchema);
                $types = array_merge($types, $relationSchemaFormattedFilters);

                $param = Str::of(FilterParser::param())->append('.')->append($resourceRelationSchema->type())->__toString();
                $rules = $rules + $this->restrictAllowedTypes($param, $relationSchemaFormattedFilters);
            }
        }

        return $rules + $this->restrictAllowedTypes(FilterParser::param(), array_unique($types));
    }

    /**
     * Get include validation rules.
     *
     * @return array
     *
     * @noinspection PhpMissingParentCallCommonInspection
     */
    protected function getIncludeRules(): array
    {
        $schema = $this->schema();

        $rules = [];
        $types = [];

        foreach ($schema->allowedIncludes() as $allowedInclude) {
            $resourceSchema = $allowedInclude->schema();

            $resourceIncludes = $resourceSchema->allowedIncludes();

            if (! empty($resourceIncludes)) {
                $types[] = $resourceSchema->type();

                $param = Str::of(IncludeParser::param())->append('.')->append($resourceSchema->type())->__toString();

                $rules = $rules + $this->restrictAllowedIncludeValues($param, $resourceSchema);
            }
        }

        return $rules + $this->restrictAllowedTypes(IncludeParser::param(), $types);
    }

    /**
     * Get the paging validation rules.
     *
     * @return array
     */
    protected function getPagingRules(): array
    {
        return $this->limit();
    }

    /**
     * Get the search validation rules.
     *
     * @return array
     */
    protected function getSearchRules(): array
    {
        return $this->require(SearchParser::param(), ['string']);
    }

    /**
     * Get the sort validation rules.
     *
     * @return array
     */
    protected function getSortRules(): array
    {
        $schema = $this->schema();

        $rules = [];
        $types = [];

        foreach ($schema->allowedIncludes() as $allowedInclude) {
            $resourceSchema = $allowedInclude->schema();

            $types[] = $resourceSchema->type();

            $param = Str::of(SortParser::param())->append('.')->append($resourceSchema->type())->__toString();

            $rules = $rules + $this->restrictAllowedSortValues($param, $resourceSchema);

            foreach ($resourceSchema->allowedIncludes() as $resourceAllowedIncludePath) {
                $resourceRelationSchema = $resourceAllowedIncludePath->schema();

                $types[] = $resourceRelationSchema->type();

                $param = Str::of(SortParser::param())->append('.')->append($resourceRelationSchema->type())->__toString();

                $rules = $rules + $this->restrictAllowedSortValues($param, $resourceRelationSchema);
            }
        }

        return $rules + $this->restrictAllowedTypes(SortParser::param(), $types);
    }

    /**
     * Filters shall be validated based on values.
     * If the value contains a separator, this is a multi-value filter that builds a where in clause.
     * Otherwise, this is a single-value filter that builds a where clause.
     * Logical operators apply to specific clauses, so we must check formatted filter parameters against filter values.
     *
     * @param  Validator  $validator
     * @return void
     *
     * @noinspection PhpMissingParentCallCommonInspection
     */
    protected function conditionallyRestrictAllowedFilterValues(Validator $validator): void
    {
        $schema = $this->schema();

        foreach ($schema->allowedIncludes() as $allowedInclude) {
            $resourceSchema = $allowedInclude->schema();

            foreach ($resourceSchema->filters() as $resourceFilter) {
                $this->conditionallyRestrictFilter($validator, $resourceSchema, $resourceFilter);
            }

            foreach ($resourceSchema->allowedIncludes() as $resourceAllowedIncludePath) {
                $resourceRelationSchema = $resourceAllowedIncludePath->schema();

                foreach ($resourceRelationSchema->filters() as $resourceRelationFilter) {
                    $this->conditionallyRestrictFilter($validator, $resourceRelationSchema, $resourceRelationFilter);
                }
            }
        }
    }
}