@import Quick;
@import Nimble;

#import "UIViewController+WMFSearch.h"
#import "WMFSearchViewController.h"
#import "MWKDataStore+TempDataStoreForEach.h"
#import "SessionSingleton.h"

@interface UIViewController (WMFSharedTestAccess)

+ (void)wmf_clearSearchViewController;

@end

QuickSpecBegin(UIViewController_WMFSearchButtonTests)

#pragma mark - Utils

    /**
 *  Dismiss the shared search view controller and wait for its view to leave the window.
 *
 *  The added wait is necessary because the view doesn't disappear synchronously even though the dismissal is not animated.
 */
    dispatch_block_t dismissSearchAndWait = ^{
        [[UIViewController wmf_sharedSearchViewController] dismissViewControllerAnimated:NO completion:nil];

        [self expectationForPredicate:
                  [NSPredicate predicateWithBlock:
                                   ^BOOL(UIViewController *_Nonnull evaluatedObject, NSDictionary<NSString *, id> *_Nullable bindings) {
                                       return evaluatedObject.view.window == nil;
                                   }]
                  evaluatedWithObject:[UIViewController wmf_sharedSearchViewController]
                              handler:nil];
        [self waitForExpectationsWithTimeout:10 handler:nil];
    };

/**
 *  Present the shared search view controller from a given presenting view controller and wait for its view to enter the window.
 *
 *  The added wait is necessary because the view doesn't appear synchronously even though the presentation is not animated.
 */
void (^presentSearchFromVCAndWait)(UIViewController *presentingVC) = ^(UIViewController *presentingVC) {
    [presentingVC wmf_showSearchAnimated:NO];

    [self expectationForPredicate:
              [NSPredicate predicateWithBlock:
                               ^BOOL(UIViewController *_Nonnull evaluatedObject, NSDictionary<NSString *, id> *_Nullable bindings) {
                                   return evaluatedObject.view.window != nil;
                               }]
              evaluatedWithObject:[UIViewController wmf_sharedSearchViewController]
                          handler:nil];
    [self waitForExpectationsWithTimeout:10 handler:nil];
};

#pragma mark - Setup

/**
 *  Dummy @c UIViewController which is used to present search.
 *
 *  Recycled between tests.
 *
 *  @warning Do not call @c wmf_showSearch: directly on this or other view controllers during tests. Use the utility
 *           functions provided above to ensure the search view is in the window before proceeding.
 */
__block UIViewController *testVC = nil;

configureTempDataStoreForEach(tempDataStore, ^{
    [UIViewController wmf_setSearchButtonDataStore:tempDataStore];
    testVC = [UIViewController new];
    [[[UIApplication sharedApplication] keyWindow] setRootViewController:testVC];
});

afterEach(^{
    // tear down search
    if ([UIViewController wmf_sharedSearchViewController].view.window) {
        dismissSearchAndWait();
    }
    [UIViewController wmf_clearSearchViewController];
    testVC.view.window.rootViewController = nil;
});

#pragma mark - Tests

describe(@"search button", ^{
    it(@"should be presentable from different view controllers", ^{
        presentSearchFromVCAndWait(testVC);

        WMFSearchViewController *oldSearchVC = [UIViewController wmf_sharedSearchViewController];

        dismissSearchAndWait();

        UIViewController *otherTestVC = [UIViewController new];

        testVC.view.window.rootViewController = otherTestVC;

        presentSearchFromVCAndWait(otherTestVC);

        expect([UIViewController wmf_sharedSearchViewController]).to(equal(oldSearchVC));
    });
});

describe(@"global searchVC", ^{
    void (^verifyGlobalVCOutOfWindowResetAfterNotificationNamed)(NSString *) = ^(NSString *notificationName) {
        presentSearchFromVCAndWait(testVC);

        expect([UIViewController wmf_sharedSearchViewController]).toNot(beNil());

        [[NSNotificationCenter defaultCenter] postNotificationName:notificationName object:nil];

        expect([UIViewController wmf_sharedSearchViewController]).to(beNil());
    };

    it(@"should be reset on memory warnings when it is not in the window", ^{
        verifyGlobalVCOutOfWindowResetAfterNotificationNamed(UIApplicationDidReceiveMemoryWarningNotification);
    });

    it(@"should reset when the app enters the background if it's not in the window", ^{
        verifyGlobalVCOutOfWindowResetAfterNotificationNamed(UIApplicationDidEnterBackgroundNotification);
    });
});

QuickSpecEnd