<?php

declare(strict_types=1);

namespace App\Framework\GraphQL;

/**
 * Represents a GraphQL schema with queries and mutations
 */
final class GraphQLSchema
{
    /** @var array<string, GraphQLField> */
    public private(set) array $queries = [];

    /** @var array<string, GraphQLField> */
    public private(set) array $mutations = [];

    /** @var array<string, GraphQLType> */
    public private(set) array $types = [];

    public string $schemaDefinition {
        get {
            $schema = [];

            // Add type definitions
            foreach ($this->types as $name => $type) {
                $schema[] = $type->toDefinition();
            }

            // Add Query type
            if (! empty($this->queries)) {
                $queryFields = [];
                foreach ($this->queries as $name => $field) {
                    $queryFields[] = "  " . $field->toDefinition($name);
                }
                $schema[] = "type Query {\n" . implode("\n", $queryFields) . "\n}";
            }

            // Add Mutation type
            if (! empty($this->mutations)) {
                $mutationFields = [];
                foreach ($this->mutations as $name => $field) {
                    $mutationFields[] = "  " . $field->toDefinition($name);
                }
                $schema[] = "type Mutation {\n" . implode("\n", $mutationFields) . "\n}";
            }

            return implode("\n\n", $schema);
        }
    }

    public int $queryCount {
        get => count($this->queries);
    }

    public int $mutationCount {
        get => count($this->mutations);
    }

    public int $typeCount {
        get => count($this->types);
    }

    public bool $hasQueries {
        get => ! empty($this->queries);
    }

    public bool $hasMutations {
        get => ! empty($this->mutations);
    }

    public function addQuery(string $name, GraphQLField $field): self
    {
        $this->queries[$name] = $field;

        return $this;
    }

    public function addMutation(string $name, GraphQLField $field): self
    {
        $this->mutations[$name] = $field;

        return $this;
    }

    public function addType(string $name, GraphQLType $type): self
    {
        $this->types[$name] = $type;

        return $this;
    }

    public function getQuery(string $name): ?GraphQLField
    {
        return $this->queries[$name] ?? null;
    }

    public function getMutation(string $name): ?GraphQLField
    {
        return $this->mutations[$name] ?? null;
    }

    public function getType(string $name): ?GraphQLType
    {
        return $this->types[$name] ?? null;
    }
}