<?php

declare(strict_types=1);

namespace GraphQL\Tests\Language;

use GraphQL\Language\AST\Location;
use GraphQL\Language\AST\Node;
use GraphQL\Language\AST\NodeList;
use GraphQL\Language\Parser;
use GraphQL\Utils\AST;
use PHPUnit\Framework\TestCase;
use function array_keys;
use function count;
use function file_get_contents;
use function get_class;
use function get_object_vars;
use function implode;
use function json_decode;

class SerializationTest extends TestCase
{
    public function testSerializesAst() : void
    {
        $kitchenSink = file_get_contents(__DIR__ . '/kitchen-sink.graphql');
        $ast         = Parser::parse($kitchenSink);
        $expectedAst = json_decode(file_get_contents(__DIR__ . '/kitchen-sink.ast'), true);
        self::assertEquals($expectedAst, $ast->toArray(true));
    }

    public function testUnserializesAst() : void
    {
        $kitchenSink   = file_get_contents(__DIR__ . '/kitchen-sink.graphql');
        $serializedAst = json_decode(file_get_contents(__DIR__ . '/kitchen-sink.ast'), true);
        $actualAst     = AST::fromArray($serializedAst);
        $parsedAst     = Parser::parse($kitchenSink);
        self::assertNodesAreEqual($parsedAst, $actualAst);
    }

    /**
     * Compares two nodes by actually iterating over all NodeLists, properly comparing locations (ignoring tokens), etc
     *
     * @param string[] $path
     */
    private static function assertNodesAreEqual(Node $expected, Node $actual, array $path = []) : void
    {
        $err = 'Mismatch at AST path: ' . implode(', ', $path);

        self::assertInstanceOf(Node::class, $actual, $err);
        self::assertEquals(get_class($expected), get_class($actual), $err);

        $expectedVars = get_object_vars($expected);
        $actualVars   = get_object_vars($actual);
        self::assertCount(count($expectedVars), $actualVars, $err);
        self::assertEquals(array_keys($expectedVars), array_keys($actualVars), $err);

        foreach ($expectedVars as $name => $expectedValue) {
            $actualValue = $actualVars[$name];
            $tmpPath     = $path;
            $tmpPath[]   = $name;
            $err         = 'Mismatch at AST path: ' . implode(', ', $tmpPath);

            if ($expectedValue instanceof Node) {
                self::assertNodesAreEqual($expectedValue, $actualValue, $tmpPath);
            } elseif ($expectedValue instanceof NodeList) {
                self::assertEquals(count($expectedValue), count($actualValue), $err);
                self::assertInstanceOf(NodeList::class, $actualValue, $err);

                foreach ($expectedValue as $index => $listNode) {
                    $tmpPath2   = $tmpPath;
                    $tmpPath2[] = $index;
                    self::assertNodesAreEqual($listNode, $actualValue[$index], $tmpPath2);
                }
            } elseif ($expectedValue instanceof Location) {
                self::assertInstanceOf(Location::class, $actualValue, $err);
                self::assertSame($expectedValue->start, $actualValue->start, $err);
                self::assertSame($expectedValue->end, $actualValue->end, $err);
            } else {
                self::assertEquals($expectedValue, $actualValue, $err);
            }
        }
    }

    public function testSerializeSupportsNoLocationOption() : void
    {
        $kitchenSink = file_get_contents(__DIR__ . '/kitchen-sink.graphql');
        $ast         = Parser::parse($kitchenSink, ['noLocation' => true]);
        $expectedAst = json_decode(file_get_contents(__DIR__ . '/kitchen-sink-noloc.ast'), true);
        self::assertEquals($expectedAst, $ast->toArray(true));
    }

    public function testUnserializeSupportsNoLocationOption() : void
    {
        $kitchenSink   = file_get_contents(__DIR__ . '/kitchen-sink.graphql');
        $serializedAst = json_decode(file_get_contents(__DIR__ . '/kitchen-sink-noloc.ast'), true);
        $actualAst     = AST::fromArray($serializedAst);
        $parsedAst     = Parser::parse($kitchenSink, ['noLocation' => true]);
        self::assertNodesAreEqual($parsedAst, $actualAst);
    }
}