<?php

declare(strict_types=1);

namespace GraphQL\Tests\Utils;

use GraphQL\Language\Parser;
use GraphQL\Type\Definition\EnumType;
use GraphQL\Type\Definition\InputObjectType;
use GraphQL\Type\Definition\Type;
use GraphQL\Utils\AST;
use GraphQL\Utils\Utils;
use PHPUnit\Framework\TestCase;

class ValueFromAstTest extends TestCase
{
    /** @var InputObjectType */
    private $inputObj;

    /**
     * @see it('rejects empty input')
     */
    public function testRejectsEmptyInput() : void
    {
        $this->assertEquals(Utils::undefined(), AST::valueFromAST(null, Type::boolean()));
    }

    /**
     * @see it('converts according to input coercion rules')
     */
    public function testConvertsAccordingToInputCoercionRules() : void
    {
        $this->runTestCase(Type::boolean(), 'true', true);
        $this->runTestCase(Type::boolean(), 'false', false);
        $this->runTestCase(Type::int(), '123', 123);
        $this->runTestCase(Type::float(), '123', 123);
        $this->runTestCase(Type::float(), '123.456', 123.456);
        $this->runTestCase(Type::string(), '"abc123"', 'abc123');
        $this->runTestCase(Type::id(), '123456', '123456');
        $this->runTestCase(Type::id(), '"123456"', '123456');
    }

    private function runTestCase($type, $valueText, $expected)
    {
        $this->assertEquals($expected, AST::valueFromAST(Parser::parseValue($valueText), $type));
    }

    /**
     * @see it('does not convert when input coercion rules reject a value')
     */
    public function testDoesNotConvertWhenInputCoercionRulesRejectAValue() : void
    {
        $undefined = Utils::undefined();

        $this->runTestCase(Type::boolean(), '123', $undefined);
        $this->runTestCase(Type::int(), '123.456', $undefined);
        $this->runTestCase(Type::int(), 'true', $undefined);
        $this->runTestCase(Type::int(), '"123"', $undefined);
        $this->runTestCase(Type::float(), '"123"', $undefined);
        $this->runTestCase(Type::string(), '123', $undefined);
        $this->runTestCase(Type::string(), 'true', $undefined);
        $this->runTestCase(Type::id(), '123.456', $undefined);
    }

    /**
     * @see it('converts enum values according to input coercion rules')
     */
    public function testConvertsEnumValuesAccordingToInputCoercionRules() : void
    {
        $testEnum = new EnumType([
            'name'   => 'TestColor',
            'values' => [
                'RED'   => ['value' => 1],
                'GREEN' => ['value' => 2],
                'BLUE'  => ['value' => 3],
                'NULL'  => ['value' => null],
            ],
        ]);

        $this->runTestCase($testEnum, 'RED', 1);
        $this->runTestCase($testEnum, 'BLUE', 3);
        $this->runTestCase($testEnum, '3', Utils::undefined());
        $this->runTestCase($testEnum, '"BLUE"', Utils::undefined());
        $this->runTestCase($testEnum, 'null', null);
        $this->runTestCase($testEnum, 'NULL', null);
    }

    /**
     * @see it('coerces to null unless non-null')
     */
    public function testCoercesToNullUnlessNonNull() : void
    {
        $this->runTestCase(Type::boolean(), 'null', null);
        $this->runTestCase(Type::nonNull(Type::boolean()), 'null', Utils::undefined());
    }

    /**
     * @see it('coerces lists of values')
     */
    public function testCoercesListsOfValues() : void
    {
        $listOfBool = Type::listOf(Type::boolean());
        $undefined  = Utils::undefined();

        $this->runTestCase($listOfBool, 'true', [true]);
        $this->runTestCase($listOfBool, '123', $undefined);
        $this->runTestCase($listOfBool, 'null', null);
        $this->runTestCase($listOfBool, '[true, false]', [true, false]);
        $this->runTestCase($listOfBool, '[true, 123]', $undefined);
        $this->runTestCase($listOfBool, '[true, null]', [true, null]);
        $this->runTestCase($listOfBool, '{ true: true }', $undefined);
    }

    /**
     * @see it('coerces non-null lists of values')
     */
    public function testCoercesNonNullListsOfValues() : void
    {
        $nonNullListOfBool = Type::nonNull(Type::listOf(Type::boolean()));
        $undefined         = Utils::undefined();

        $this->runTestCase($nonNullListOfBool, 'true', [true]);
        $this->runTestCase($nonNullListOfBool, '123', $undefined);
        $this->runTestCase($nonNullListOfBool, 'null', $undefined);
        $this->runTestCase($nonNullListOfBool, '[true, false]', [true, false]);
        $this->runTestCase($nonNullListOfBool, '[true, 123]', $undefined);
        $this->runTestCase($nonNullListOfBool, '[true, null]', [true, null]);
    }

    /**
     * @see it('coerces lists of non-null values')
     */
    public function testCoercesListsOfNonNullValues() : void
    {
        $listOfNonNullBool = Type::listOf(Type::nonNull(Type::boolean()));
        $undefined         = Utils::undefined();

        $this->runTestCase($listOfNonNullBool, 'true', [true]);
        $this->runTestCase($listOfNonNullBool, '123', $undefined);
        $this->runTestCase($listOfNonNullBool, 'null', null);
        $this->runTestCase($listOfNonNullBool, '[true, false]', [true, false]);
        $this->runTestCase($listOfNonNullBool, '[true, 123]', $undefined);
        $this->runTestCase($listOfNonNullBool, '[true, null]', $undefined);
    }

    /**
     * @see it('coerces non-null lists of non-null values')
     */
    public function testCoercesNonNullListsOfNonNullValues() : void
    {
        $nonNullListOfNonNullBool = Type::nonNull(Type::listOf(Type::nonNull(Type::boolean())));
        $undefined                = Utils::undefined();

        $this->runTestCase($nonNullListOfNonNullBool, 'true', [true]);
        $this->runTestCase($nonNullListOfNonNullBool, '123', $undefined);
        $this->runTestCase($nonNullListOfNonNullBool, 'null', $undefined);
        $this->runTestCase($nonNullListOfNonNullBool, '[true, false]', [true, false]);
        $this->runTestCase($nonNullListOfNonNullBool, '[true, 123]', $undefined);
        $this->runTestCase($nonNullListOfNonNullBool, '[true, null]', $undefined);
    }

    /**
     * @see it('coerces input objects according to input coercion rules')
     */
    public function testCoercesInputObjectsAccordingToInputCoercionRules() : void
    {
        $testInputObj = $this->inputObj();
        $undefined    = Utils::undefined();

        $this->runTestCase($testInputObj, 'null', null);
        $this->runTestCase($testInputObj, '123', $undefined);
        $this->runTestCase($testInputObj, '[]', $undefined);
        $this->runTestCase($testInputObj, '{ int: 123, requiredBool: false }', ['int' => 123, 'requiredBool' => false]);
        $this->runTestCase(
            $testInputObj,
            '{ bool: true, requiredBool: false }',
            ['int' => 42, 'bool' => true, 'requiredBool' => false]
        );
        $this->runTestCase($testInputObj, '{ int: true, requiredBool: true }', $undefined);
        $this->runTestCase($testInputObj, '{ requiredBool: null }', $undefined);
        $this->runTestCase($testInputObj, '{ bool: true }', $undefined);
    }

    private function inputObj()
    {
        return $this->inputObj ?: $this->inputObj = new InputObjectType([
            'name'   => 'TestInput',
            'fields' => [
                'int'          => ['type' => Type::int(), 'defaultValue' => 42],
                'bool'         => ['type' => Type::boolean()],
                'requiredBool' => ['type' => Type::nonNull(Type::boolean())],
            ],
        ]);
    }

    /**
     * @see it('accepts variable values assuming already coerced')
     */
    public function testAcceptsVariableValuesAssumingAlreadyCoerced() : void
    {
        $this->runTestCaseWithVars([], Type::boolean(), '$var', Utils::undefined());
        $this->runTestCaseWithVars(['var' => true], Type::boolean(), '$var', true);
        $this->runTestCaseWithVars(['var' => null], Type::boolean(), '$var', null);
    }

    private function runTestCaseWithVars($variables, $type, $valueText, $expected)
    {
        $this->assertEquals($expected, AST::valueFromAST(Parser::parseValue($valueText), $type, $variables));
    }

    /**
     * @see it('asserts variables are provided as items in lists')
     */
    public function testAssertsVariablesAreProvidedAsItemsInLists() : void
    {
        $listOfBool        = Type::listOf(Type::boolean());
        $listOfNonNullBool = Type::listOf(Type::nonNull(Type::boolean()));

        $this->runTestCaseWithVars([], $listOfBool, '[ $foo ]', [null]);
        $this->runTestCaseWithVars([], $listOfNonNullBool, '[ $foo ]', Utils::undefined());
        $this->runTestCaseWithVars(['foo' => true], $listOfNonNullBool, '[ $foo ]', [true]);
        // Note: variables are expected to have already been coerced, so we
        // do not expect the singleton wrapping behavior for variables.
        $this->runTestCaseWithVars(['foo' => true], $listOfNonNullBool, '$foo', true);
        $this->runTestCaseWithVars(['foo' => [true]], $listOfNonNullBool, '$foo', [true]);
    }

    /**
     * @see it('omits input object fields for unprovided variables')
     */
    public function testOmitsInputObjectFieldsForUnprovidedVariables() : void
    {
        $testInputObj = $this->inputObj();

        $this->runTestCaseWithVars(
            [],
            $testInputObj,
            '{ int: $foo, bool: $foo, requiredBool: true }',
            ['int' => 42, 'requiredBool' => true]
        );
        $this->runTestCaseWithVars(
            [],
            $testInputObj,
            '{ requiredBool: $foo }',
            Utils::undefined()
        );
        $this->runTestCaseWithVars(
            ['foo' => true],
            $testInputObj,
            '{ requiredBool: $foo }',
            ['int' => 42, 'requiredBool' => true]
        );
    }
}