<?php

namespace GraphQL\Tests\Executor;

use GraphQL\Deferred;
use GraphQL\Error\UserError;
use GraphQL\Executor\Executor;
use GraphQL\Error\FormattedError;
use GraphQL\Language\Parser;
use GraphQL\Language\SourceLocation;
use GraphQL\Type\Schema;
use GraphQL\Type\Definition\ObjectType;
use GraphQL\Type\Definition\Type;
use PHPUnit\Framework\TestCase;

class NonNullTest extends TestCase
{
    /** @var \Exception */
    public $syncError;

    /** @var \Exception */
    public $syncNonNullError;

    /** @var  \Exception */
    public $promiseError;

    /** @var  \Exception */
    public $promiseNonNullError;

    public $throwingData;
    public $nullingData;
    public $schema;

    public function setUp()
    {
        $this->syncError = new UserError('sync');
        $this->syncNonNullError = new UserError('syncNonNull');
        $this->promiseError = new UserError('promise');
        $this->promiseNonNullError = new UserError('promiseNonNull');

        $this->throwingData = [
            'sync' => function () {
                throw $this->syncError;
            },
            'syncNonNull' => function () {
                throw $this->syncNonNullError;
            },
            'promise' => function () {
                return new Deferred(function () {
                    throw $this->promiseError;
                });
            },
            'promiseNonNull' => function () {
                return new Deferred(function () {
                    throw $this->promiseNonNullError;
                });
            },
            'syncNest' => function () {
                return $this->throwingData;
            },
            'syncNonNullNest' => function () {
                return $this->throwingData;
            },
            'promiseNest' => function () {
                return new Deferred(function () {
                    return $this->throwingData;
                });
            },
            'promiseNonNullNest' => function () {
                return new Deferred(function () {
                    return $this->throwingData;
                });
            },
        ];

        $this->nullingData = [
            'sync' => function () {
                return null;
            },
            'syncNonNull' => function () {
                return null;
            },
            'promise' => function () {
                return new Deferred(function () {
                    return null;
                });
            },
            'promiseNonNull' => function () {
                return new Deferred(function () {
                    return null;
                });
            },
            'syncNest' => function () {
                return $this->nullingData;
            },
            'syncNonNullNest' => function () {
                return $this->nullingData;
            },
            'promiseNest' => function () {
                return new Deferred(function () {
                    return $this->nullingData;
                });
            },
            'promiseNonNullNest' => function () {
                return new Deferred(function () {
                    return $this->nullingData;
                });
            },
        ];

        $dataType = new ObjectType([
            'name' => 'DataType',
            'fields' => function() use (&$dataType) {
                return [
                    'sync' => ['type' => Type::string()],
                    'syncNonNull' => ['type' => Type::nonNull(Type::string())],
                    'promise' => Type::string(),
                    'promiseNonNull' => Type::nonNull(Type::string()),
                    'syncNest' => $dataType,
                    'syncNonNullNest' => Type::nonNull($dataType),
                    'promiseNest' => $dataType,
                    'promiseNonNullNest' => Type::nonNull($dataType),
                ];
            }
        ]);

        $this->schema = new Schema(['query' => $dataType]);
    }

    // Execute: handles non-nullable types

    /**
     * @see it('nulls a nullable field that throws synchronously')
     */
    public function testNullsANullableFieldThatThrowsSynchronously()
    {
        $doc = '
      query Q {
        sync
      }
        ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'sync' => null,
            ],
            'errors' => [
                FormattedError::create(
                    $this->syncError->getMessage(),
                    [new SourceLocation(3, 9)]
                )
            ]
        ];
        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsANullableFieldThatThrowsInAPromise()
    {
        $doc = '
      query Q {
        promise
      }
        ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'promise' => null,
            ],
            'errors' => [
                FormattedError::create(
                    $this->promiseError->getMessage(),
                    [new SourceLocation(3, 9)]
                )
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsASynchronouslyReturnedObjectThatContainsANonNullableFieldThatThrowsSynchronously()
    {
        // nulls a synchronously returned object that contains a non-nullable field that throws synchronously
        $doc = '
      query Q {
        syncNest {
          syncNonNull,
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => null
            ],
            'errors' => [
                FormattedError::create($this->syncNonNullError->getMessage(), [new SourceLocation(4, 11)])
            ]
        ];
        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsAsynchronouslyReturnedObjectThatContainsANonNullableFieldThatThrowsInAPromise()
    {
        $doc = '
      query Q {
        syncNest {
          promiseNonNull,
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => null
            ],
            'errors' => [
                FormattedError::create($this->promiseNonNullError->getMessage(), [new SourceLocation(4, 11)])
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsAnObjectReturnedInAPromiseThatContainsANonNullableFieldThatThrowsSynchronously()
    {
        $doc = '
      query Q {
        promiseNest {
          syncNonNull,
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'promiseNest' => null
            ],
            'errors' => [
                FormattedError::create($this->syncNonNullError->getMessage(), [new SourceLocation(4, 11)])
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsAnObjectReturnedInAPromiseThatContainsANonNullableFieldThatThrowsInAPromise()
    {
        $doc = '
      query Q {
        promiseNest {
          promiseNonNull,
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'promiseNest' => null
            ],
            'errors' => [
                FormattedError::create($this->promiseNonNullError->getMessage(), [new SourceLocation(4, 11)])
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    /**
     * @see it('nulls a complex tree of nullable fields that throw')
     */
    public function testNullsAComplexTreeOfNullableFieldsThatThrow()
    {
        $doc = '
      query Q {
        syncNest {
          sync
          promise
          syncNest {
            sync
            promise
          }
          promiseNest {
            sync
            promise
          }
        }
        promiseNest {
          sync
          promise
          syncNest {
            sync
            promise
          }
          promiseNest {
            sync
            promise
          }
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => [
                    'sync' => null,
                    'promise' => null,
                    'syncNest' => [
                        'sync' => null,
                        'promise' => null,
                    ],
                    'promiseNest' => [
                        'sync' => null,
                        'promise' => null,
                    ],
                ],
                'promiseNest' => [
                    'sync' => null,
                    'promise' => null,
                    'syncNest' => [
                        'sync' => null,
                        'promise' => null,
                    ],
                    'promiseNest' => [
                        'sync' => null,
                        'promise' => null,
                    ],
                ],
            ],
            'errors' => [
                FormattedError::create($this->syncError->getMessage(), [new SourceLocation(4, 11)]),
                FormattedError::create($this->syncError->getMessage(), [new SourceLocation(7, 13)]),
                FormattedError::create($this->syncError->getMessage(), [new SourceLocation(11, 13)]),
                FormattedError::create($this->syncError->getMessage(), [new SourceLocation(16, 11)]),
                FormattedError::create($this->syncError->getMessage(), [new SourceLocation(19, 13)]),
                FormattedError::create($this->promiseError->getMessage(), [new SourceLocation(5, 11)]),
                FormattedError::create($this->promiseError->getMessage(), [new SourceLocation(8, 13)]),
                FormattedError::create($this->syncError->getMessage(), [new SourceLocation(23, 13)]),
                FormattedError::create($this->promiseError->getMessage(), [new SourceLocation(12, 13)]),
                FormattedError::create($this->promiseError->getMessage(), [new SourceLocation(17, 11)]),
                FormattedError::create($this->promiseError->getMessage(), [new SourceLocation(20, 13)]),
                FormattedError::create($this->promiseError->getMessage(), [new SourceLocation(24, 13)]),
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsTheFirstNullableObjectAfterAFieldThrowsInALongChainOfFieldsThatAreNonNull()
    {
        $doc = '
      query Q {
        syncNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  syncNonNull
                }
              }
            }
          }
        }
        promiseNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  syncNonNull
                }
              }
            }
          }
        }
        anotherNest: syncNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  promiseNonNull
                }
              }
            }
          }
        }
        anotherPromiseNest: promiseNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  promiseNonNull
                }
              }
            }
          }
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => null,
                'promiseNest' => null,
                'anotherNest' => null,
                'anotherPromiseNest' => null,
            ],
            'errors' => [
                FormattedError::create($this->syncNonNullError->getMessage(), [new SourceLocation(8, 19)]),
                FormattedError::create($this->syncNonNullError->getMessage(), [new SourceLocation(19, 19)]),
                FormattedError::create($this->promiseNonNullError->getMessage(), [new SourceLocation(30, 19)]),
                FormattedError::create($this->promiseNonNullError->getMessage(), [new SourceLocation(41, 19)]),
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsANullableFieldThatSynchronouslyReturnsNull()
    {
        $doc = '
      query Q {
        sync
      }
        ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'sync' => null,
            ]
        ];
        $this->assertEquals($expected, Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray());
    }

    public function testNullsANullableFieldThatReturnsNullInAPromise()
    {
        $doc = '
      query Q {
        promise
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'promise' => null,
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray());
    }

    public function testNullsASynchronouslyReturnedObjectThatContainsANonNullableFieldThatReturnsNullSynchronously()
    {
        $doc = '
      query Q {
        syncNest {
          syncNonNull,
        }
      }
        ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => null
            ],
            'errors' => [
                [
                    'debugMessage' => 'Cannot return null for non-nullable field DataType.syncNonNull.',
                    'locations' => [['line' => 4, 'column' => 11]]
                ]
            ]
        ];
        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray(true));
    }

    public function testNullsASynchronouslyReturnedObjectThatContainsANonNullableFieldThatReturnsNullInAPromise()
    {
        $doc = '
      query Q {
        syncNest {
          promiseNonNull,
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => null,
            ],
            'errors' => [
                [
                    'debugMessage' => 'Cannot return null for non-nullable field DataType.promiseNonNull.',
                    'locations' => [['line' => 4, 'column' => 11]]
                ],
            ]
        ];

        $this->assertArraySubset(
            $expected,
            Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray(true)
        );
    }

    public function testNullsAnObjectReturnedInAPromiseThatContainsANonNullableFieldThatReturnsNullSynchronously()
    {
        $doc = '
      query Q {
        promiseNest {
          syncNonNull,
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'promiseNest' => null,
            ],
            'errors' => [
                [
                    'debugMessage' => 'Cannot return null for non-nullable field DataType.syncNonNull.',
                    'locations' => [['line' => 4, 'column' => 11]]
                ],
            ]
        ];

        $this->assertArraySubset(
            $expected,
            Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray(true)
        );
    }

    public function testNullsAnObjectReturnedInAPromiseThatContainsANonNullableFieldThatReturnsNullInaAPromise()
    {
        $doc = '
      query Q {
        promiseNest {
          promiseNonNull,
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'promiseNest' => null,
            ],
            'errors' => [
                [
                    'debugMessage' => 'Cannot return null for non-nullable field DataType.promiseNonNull.',
                    'locations' => [['line' => 4, 'column' => 11]]
                ],
            ]
        ];

        $this->assertArraySubset(
            $expected,
            Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray(true)
        );
    }

    public function testNullsAComplexTreeOfNullableFieldsThatReturnNull()
    {
        $doc = '
      query Q {
        syncNest {
          sync
          promise
          syncNest {
            sync
            promise
          }
          promiseNest {
            sync
            promise
          }
        }
        promiseNest {
          sync
          promise
          syncNest {
            sync
            promise
          }
          promiseNest {
            sync
            promise
          }
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => [
                    'sync' => null,
                    'promise' => null,
                    'syncNest' => [
                        'sync' => null,
                        'promise' => null,
                    ],
                    'promiseNest' => [
                        'sync' => null,
                        'promise' => null,
                    ]
                ],
                'promiseNest' => [
                    'sync' => null,
                    'promise' => null,
                    'syncNest' => [
                        'sync' => null,
                        'promise' => null,
                    ],
                    'promiseNest' => [
                        'sync' => null,
                        'promise' => null,
                    ]
                ]
            ]
        ];

        $actual = Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray();
        $this->assertEquals($expected, $actual);
    }

    public function testNullsTheFirstNullableObjectAfterAFieldReturnsNullInALongChainOfFieldsThatAreNonNull()
    {
        $doc = '
      query Q {
        syncNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  syncNonNull
                }
              }
            }
          }
        }
        promiseNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  syncNonNull
                }
              }
            }
          }
        }
        anotherNest: syncNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  promiseNonNull
                }
              }
            }
          }
        }
        anotherPromiseNest: promiseNest {
          syncNonNullNest {
            promiseNonNullNest {
              syncNonNullNest {
                promiseNonNullNest {
                  promiseNonNull
                }
              }
            }
          }
        }
      }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'data' => [
                'syncNest' => null,
                'promiseNest' => null,
                'anotherNest' => null,
                'anotherPromiseNest' => null,
            ],
            'errors' => [
                ['debugMessage' => 'Cannot return null for non-nullable field DataType.syncNonNull.', 'locations' => [ ['line' => 8, 'column' => 19]]],
                ['debugMessage' => 'Cannot return null for non-nullable field DataType.syncNonNull.', 'locations' => [ ['line' => 19, 'column' => 19]]],
                ['debugMessage' => 'Cannot return null for non-nullable field DataType.promiseNonNull.', 'locations' => [ ['line' => 30, 'column' => 19]]],
                ['debugMessage' => 'Cannot return null for non-nullable field DataType.promiseNonNull.', 'locations' => [ ['line' => 41, 'column' => 19]]],
            ]
        ];

        $this->assertArraySubset(
            $expected,
            Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray(true)
        );
    }

    /**
     * @see it('nulls the top level if sync non-nullable field throws')
     */
    public function testNullsTheTopLevelIfSyncNonNullableFieldThrows()
    {
        $doc = '
      query Q { syncNonNull }
        ';

        $expected = [
            'errors' => [
                FormattedError::create($this->syncNonNullError->getMessage(), [new SourceLocation(2, 17)])
            ]
        ];
        $actual = Executor::execute($this->schema, Parser::parse($doc), $this->throwingData)->toArray();
        $this->assertArraySubset($expected, $actual);
    }

    public function testNullsTheTopLevelIfAsyncNonNullableFieldErrors()
    {
        $doc = '
      query Q { promiseNonNull }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'errors' => [
                FormattedError::create($this->promiseNonNullError->getMessage(), [new SourceLocation(2, 17)]),
            ]
        ];

        $this->assertArraySubset($expected, Executor::execute($this->schema, $ast, $this->throwingData, null, [], 'Q')->toArray());
    }

    public function testNullsTheTopLevelIfSyncNonNullableFieldReturnsNull()
    {
        // nulls the top level if sync non-nullable field returns null
        $doc = '
      query Q { syncNonNull }
        ';

        $expected = [
            'errors' => [
                [
                    'debugMessage' => 'Cannot return null for non-nullable field DataType.syncNonNull.',
                    'locations' => [['line' => 2, 'column' => 17]]
                ],
            ]
        ];
        $this->assertArraySubset(
            $expected,
            Executor::execute($this->schema, Parser::parse($doc), $this->nullingData)->toArray(true)
        );
    }

    public function testNullsTheTopLevelIfAsyncNonNullableFieldResolvesNull()
    {
        $doc = '
      query Q { promiseNonNull }
    ';

        $ast = Parser::parse($doc);

        $expected = [
            'errors' => [
                [
                    'debugMessage' => 'Cannot return null for non-nullable field DataType.promiseNonNull.',
                    'locations' => [['line' => 2, 'column' => 17]]
                ],
            ]
        ];

        $this->assertArraySubset(
            $expected,
            Executor::execute($this->schema, $ast, $this->nullingData, null, [], 'Q')->toArray(true)
        );
    }
}