/*
 * Copyright 2017 Google
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import <Foundation/Foundation.h>

#import <XCTest/XCTest.h>

#import "FPruneForest.h"
#import "FPath.h"

@interface FPruneForestTest : XCTestCase

@end

@implementation FPruneForestTest

- (void) testEmptyDoesNotAffectAnyPaths {
    FPruneForest *forest = [FPruneForest empty];
    XCTAssertFalse([forest affectsPath:[FPath empty]]);
    XCTAssertFalse([forest affectsPath:[FPath pathWithString:@"foo"]]);
}

- (void) testPruneAffectsPath {
    FPruneForest *forest = [FPruneForest empty];
    forest = [forest prunePath:[FPath pathWithString:@"foo/bar"]];
    forest = [forest keepPath:[FPath pathWithString:@"foo/bar/baz"]];
    XCTAssertTrue([forest affectsPath:[FPath pathWithString:@"foo"]]);
    XCTAssertFalse([forest affectsPath:[FPath pathWithString:@"baz"]]);
    XCTAssertFalse([forest affectsPath:[FPath pathWithString:@"baz/bar"]]);
    XCTAssertTrue([forest affectsPath:[FPath pathWithString:@"foo/bar"]]);
    XCTAssertTrue([forest affectsPath:[FPath pathWithString:@"foo/bar/baz"]]);
    XCTAssertTrue([forest affectsPath:[FPath pathWithString:@"foo/bar/qux"]]);
}

- (void) testPruneAnythingWorks {
    FPruneForest *empty = [FPruneForest empty];
    XCTAssertFalse([empty prunesAnything]);
    XCTAssertTrue([[empty prunePath:[FPath pathWithString:@"foo"]] prunesAnything]);
    XCTAssertFalse([[[empty prunePath:[FPath pathWithString:@"foo/bar"]] keepPath:[FPath pathWithString:@"foo"]] prunesAnything]);
    XCTAssertTrue([[[empty prunePath:[FPath pathWithString:@"foo"]] keepPath:[FPath pathWithString:@"foo/bar"]] prunesAnything]);
}

- (void) testKeepUnderPruneWorks {
    FPruneForest *forest = [FPruneForest empty];
    forest = [forest prunePath:[FPath pathWithString:@"foo/bar"]];
    forest = [forest keepPath:[FPath pathWithString:@"foo/bar/baz"]];
    forest = [forest keepAll:[NSSet setWithArray:@[@"qux", @"quu"]] atPath:[FPath pathWithString:@"foo/bar"]];
}

- (void) testPruneUnderKeepThrows {
    FPruneForest *forest = [FPruneForest empty];
    forest = [forest prunePath:[FPath pathWithString:@"foo"]];
    forest = [forest keepPath:[FPath pathWithString:@"foo/bar"]];
    XCTAssertThrows([forest prunePath:[FPath pathWithString:@"foo/bar/baz"]]);
    NSSet *children = [NSSet setWithArray:@[@"qux", @"quu"]];
    XCTAssertThrows([forest pruneAll:children atPath:[FPath pathWithString:@"foo/bar"]]);
}

- (void) testChildKeepsPruneInfo {
    FPruneForest *forest = [FPruneForest empty];
    forest = [forest keepPath:[FPath pathWithString:@"foo/bar"]];
    XCTAssertTrue([[forest child:@"foo"] affectsPath:[FPath pathWithString:@"bar"]]);
    XCTAssertTrue([[[forest child:@"foo"] child:@"bar"] affectsPath:[FPath pathWithString:@""]]);
    XCTAssertTrue([[[[forest child:@"foo"] child:@"bar"] child:@"baz"] affectsPath:[FPath pathWithString:@""]]);

    forest = [[FPruneForest empty] prunePath:[FPath pathWithString:@"foo/bar"]];
    XCTAssertTrue([[forest child:@"foo"] affectsPath:[FPath pathWithString:@"bar"]]);
    XCTAssertTrue([[[forest child:@"foo"] child:@"bar"] affectsPath:[FPath pathWithString:@""]]);
    XCTAssertTrue([[[[forest child:@"foo"] child:@"bar"] child:@"baz"] affectsPath:[FPath pathWithString:@""]]);

    XCTAssertFalse([[forest child:@"non-existent"] affectsPath:[FPath pathWithString:@""]]);
}

- (void) testShouldPruneWorks {
    FPruneForest *forest = [FPruneForest empty];
    forest = [forest prunePath:[FPath pathWithString:@"foo"]];
    forest = [forest keepPath:[FPath pathWithString:@"foo/bar/baz"]];
    XCTAssertTrue([forest shouldPruneUnkeptDescendantsAtPath:[FPath pathWithString:@"foo"]]);
    XCTAssertTrue([forest shouldPruneUnkeptDescendantsAtPath:[FPath pathWithString:@"foo/bar"]]);
    XCTAssertFalse([forest shouldPruneUnkeptDescendantsAtPath:[FPath pathWithString:@"foo/bar/baz"]]);
    XCTAssertFalse([forest shouldPruneUnkeptDescendantsAtPath:[FPath pathWithString:@"qux"]]);
}


@end