//
//  KBKeyboardSubscriptionView.m
//  CustomKeyboard
//

#import "KBKeyboardSubscriptionView.h"
#import "KBKeyboardSubscriptionProduct.h"
#import "KBNetworkManager.h"
#import "KBFullAccessManager.h"
#import "KBKeyboardSubscriptionFeatureMarqueeView.h"
#import "KBKeyboardSubscriptionOptionCell.h"

#import <MJExtension/MJExtension.h>

static NSString * const kKBKeyboardSubscriptionCellId = @"kKBKeyboardSubscriptionCellId";

@interface KBKeyboardSubscriptionView () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
@property (nonatomic, strong) UIImageView *cardView;
@property (nonatomic, strong) UIButton *closeButton;
@property (nonatomic, strong) KBKeyboardSubscriptionFeatureMarqueeView *featureMarqueeView;
@property (nonatomic, strong) UICollectionView *collectionView;
@property (nonatomic, strong) UIButton *purchaseButton;
@property (nonatomic, strong) UILabel *agreementLabel;
@property (nonatomic, strong) UIButton *agreementButton;
@property (nonatomic, strong) UIActivityIndicatorView *loadingIndicator;
@property (nonatomic, strong) UILabel *emptyLabel;
@property (nonatomic, copy) NSArray<KBKeyboardSubscriptionProduct *> *products;
@property (nonatomic, assign) NSInteger selectedIndex;
@property (nonatomic, assign) BOOL didLoadOnce;
@property (nonatomic, assign, getter=isLoading) BOOL loading;
@end

@implementation KBKeyboardSubscriptionView

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor clearColor];
        _selectedIndex = NSNotFound;
        [self setupCardView];
        [self setupFeatureItems];
    }
    return self;
}

#pragma mark - Public

- (void)refreshProductsIfNeeded {
    if (!self.didLoadOnce) {
        [self fetchProducts];
    }
}

- (void)reloadProducts {
    [self fetchProducts];
}

#pragma mark - UI

- (void)setupCardView {
    [self addSubview:self.cardView];
    [self.cardView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.mas_left).offset(0);
        make.right.equalTo(self.mas_right).offset(0);
        make.top.equalTo(self.mas_top).offset(0);
        make.bottom.equalTo(self.mas_bottom).offset(0);
    }];

    [self.cardView addSubview:self.closeButton];
    [self.cardView addSubview:self.featureMarqueeView];
    [self.cardView addSubview:self.collectionView];
    [self.cardView addSubview:self.purchaseButton];
    [self.cardView addSubview:self.agreementLabel];
    [self.cardView addSubview:self.agreementButton];
    [self.cardView addSubview:self.loadingIndicator];
    [self.cardView addSubview:self.emptyLabel];

    [self.closeButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.cardView.mas_left).offset(12);
        make.top.equalTo(self.cardView.mas_top).offset(25);
        make.width.height.mas_equalTo(28);
    }];

    [self.featureMarqueeView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.closeButton.mas_right).offset(5);
        make.centerY.equalTo(self.closeButton);
        make.right.equalTo(self.cardView.mas_right).offset(-12);
        make.height.mas_equalTo(48);
    }];

    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self).inset(16);
        make.top.equalTo(self.featureMarqueeView.mas_bottom).offset(0);
        make.height.mas_equalTo(76);
    }];

    [self.purchaseButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.cardView.mas_left).offset(16);
        make.right.equalTo(self.cardView.mas_right).offset(-16);
        make.top.equalTo(self.collectionView.mas_bottom).offset(20);
//        make.bottom.equalTo(self.agreementLabel.mas_top).offset(-16);
        make.height.mas_greaterThanOrEqualTo(@45);
    }];
    
    [self.agreementLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.cardView.mas_centerX);
        make.top.equalTo(self.purchaseButton.mas_bottom).offset(8);
    }];
    
    [self.agreementButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.cardView.mas_centerX);
        make.top.equalTo(self.agreementLabel.mas_bottom).offset(4);
    }];

   

    

    [self.loadingIndicator mas_makeConstraints:^(MASConstraintMaker *make) {
        make.center.equalTo(self.collectionView);
    }];

    [self.emptyLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.center.equalTo(self.collectionView);
    }];

    [self updatePurchaseButtonState];
}

- (void)setupFeatureItems {
    NSArray *titles = @[
        KBLocalized(@"Wireless Sub-ai\nDialogue"),
        KBLocalized(@"Personalized\nKeyboard"),
        KBLocalized(@"Chat\nPersona"),
        KBLocalized(@"Emotional\nCounseling")
    ];
    NSArray *images = @[
        [UIImage imageNamed:@"home_ai_icon"] ?: [UIImage new],
        [UIImage imageNamed:@"home_keyboard_icon"] ?: [UIImage new],
        [UIImage imageNamed:@"home_chat_icon"] ?: [UIImage new],
        [UIImage imageNamed:@"home_emotion_icon"] ?: [UIImage new]
    ];
    [self.featureMarqueeView configureWithTitles:titles images:images];
}

#pragma mark - Actions

- (void)onTapClose {
    if ([self.delegate respondsToSelector:@selector(subscriptionViewDidTapClose:)]) {
        [self.delegate subscriptionViewDidTapClose:self];
    }
}

- (void)onTapPurchase {
    if (self.selectedIndex == NSNotFound || self.selectedIndex >= self.products.count) {
        [KBHUD showInfo:KBLocalized(@"Please select a product")];
        return;
    }
    KBKeyboardSubscriptionProduct *product = self.products[self.selectedIndex];
    if ([self.delegate respondsToSelector:@selector(subscriptionView:didTapPurchaseForProduct:)]) {
        [self.delegate subscriptionView:self didTapPurchaseForProduct:product];
    }
}

- (void)onTapAgreement {
    [KBHUD showInfo:KBLocalized(@"Agreement coming soon")];
}

#pragma mark - Data

- (void)fetchProducts {
    if (self.isLoading) { return; }
    if (![[KBFullAccessManager shared] hasFullAccess]) {
        [KBHUD showInfo:KBLocalized(@"Enable Full Access to continue")];
        return;
    }
    self.loading = YES;
    self.emptyLabel.hidden = YES;
    [self.loadingIndicator startAnimating];
    NSDictionary *params = @{@"type": @"subscription"};
    __weak typeof(self) weakSelf = self;
    [[KBNetworkManager shared] GET:API_SUBSCRIPTION_PRODUCT_LIST
                        parameters:params
                           headers:nil
                         completion:^(NSDictionary *json, NSURLResponse *response, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            __strong typeof(weakSelf) self = weakSelf;
            if (!self) { return; }
            self.loading = NO;
            [self.loadingIndicator stopAnimating];
            if (error) {
                NSString *tip = error.localizedDescription ?: KBLocalized(@"Network error");
                [KBHUD showInfo:tip];
                self.products = @[];
                self.selectedIndex = NSNotFound;
                [self.collectionView reloadData];
                self.emptyLabel.hidden = NO;
                [self updatePurchaseButtonState];
                return;
            }
            id dataObj = json[@"data"];
            if (![dataObj isKindOfClass:[NSArray class]]) {
                dataObj = json[@"list"];
            }
            if (![dataObj isKindOfClass:[NSArray class]]) {
                self.products = @[];
                self.selectedIndex = NSNotFound;
                [self.collectionView reloadData];
                self.emptyLabel.hidden = NO;
                [self updatePurchaseButtonState];
                return;
            }
            NSArray *models = [KBKeyboardSubscriptionProduct mj_objectArrayWithKeyValuesArray:(NSArray *)dataObj];
            self.products = models ?: @[];
            self.selectedIndex = self.products.count > 0 ? 0 : NSNotFound;
            self.emptyLabel.hidden = self.products.count > 0;
            [self.collectionView reloadData];
            [self selectCurrentProductAnimated:NO];
            [self updatePurchaseButtonState];
            self.didLoadOnce = YES;
        });
    }];
}

- (void)selectCurrentProductAnimated:(BOOL)animated {
    if (self.selectedIndex == NSNotFound || self.selectedIndex >= self.products.count) { return; }
    NSIndexPath *indexPath = [NSIndexPath indexPathForItem:self.selectedIndex inSection:0];
    [self.collectionView selectItemAtIndexPath:indexPath animated:animated scrollPosition:UICollectionViewScrollPositionCenteredHorizontally];
    KBKeyboardSubscriptionOptionCell *cell = (KBKeyboardSubscriptionOptionCell *)[self.collectionView cellForItemAtIndexPath:indexPath];
    if ([cell isKindOfClass:KBKeyboardSubscriptionOptionCell.class]) {
        [cell applySelected:YES animated:animated];
    }
}

- (void)updatePurchaseButtonState {
    BOOL enabled = (self.products.count > 0);
    self.purchaseButton.enabled = enabled;
    self.purchaseButton.alpha = enabled ? 1.0 : 0.5;
}

#pragma mark - UICollectionView DataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.products.count;
}

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    KBKeyboardSubscriptionOptionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kKBKeyboardSubscriptionCellId forIndexPath:indexPath];
    if (indexPath.item < self.products.count) {
        KBKeyboardSubscriptionProduct *product = self.products[indexPath.item];
        [cell configureWithProduct:product];
        BOOL selected = (indexPath.item == self.selectedIndex);
        [cell applySelected:selected animated:NO];
    } else {
        [cell configureWithProduct:nil];
        [cell applySelected:NO animated:NO];
    }
    return cell;
}

#pragma mark - UICollectionView Delegate

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.item >= self.products.count) { return; }
    NSInteger previous = self.selectedIndex;
    self.selectedIndex = indexPath.item;
    if (previous != NSNotFound && previous != indexPath.item) {
        NSIndexPath *prev = [NSIndexPath indexPathForItem:previous inSection:0];
        KBKeyboardSubscriptionOptionCell *prevCell = (KBKeyboardSubscriptionOptionCell *)[collectionView cellForItemAtIndexPath:prev];
        [prevCell applySelected:NO animated:YES];
    }
    KBKeyboardSubscriptionOptionCell *cell = (KBKeyboardSubscriptionOptionCell *)[collectionView cellForItemAtIndexPath:indexPath];
    [cell applySelected:YES animated:YES];
}

#pragma mark - Layout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
//    CGFloat width = MIN(MAX(collectionView.bounds.size.width * 0.56, 150), 220);
    return CGSizeMake(160, collectionView.bounds.size.height);
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return 12.0;
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(0, 0, 0, 0);
}

#pragma mark - Lazy

- (UIImageView *)cardView {
    if (!_cardView) {
        _cardView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"keybord_bg_icon"]];
//        _cardView.layer.cornerRadius = 20;
//        _cardView.layer.masksToBounds = YES;
        _cardView.userInteractionEnabled = YES;
        _cardView.contentMode = UIViewContentModeScaleAspectFill;
    }
    return _cardView;
}

- (UIButton *)closeButton {
    if (!_closeButton) {
        _closeButton = [UIButton buttonWithType:UIButtonTypeSystem];
        _closeButton.backgroundColor = [[UIColor whiteColor] colorWithAlphaComponent:0.7];
        _closeButton.layer.cornerRadius = 14;
        _closeButton.layer.masksToBounds = YES;
        [_closeButton setTitle:@"✕" forState:UIControlStateNormal];
        [_closeButton setTitleColor:[UIColor colorWithHex:0x666666] forState:UIControlStateNormal];
        _closeButton.titleLabel.font = [UIFont systemFontOfSize:14 weight:UIFontWeightSemibold];
        [_closeButton addTarget:self action:@selector(onTapClose) forControlEvents:UIControlEventTouchUpInside];
    }
    return _closeButton;
}

- (KBKeyboardSubscriptionFeatureMarqueeView *)featureMarqueeView {
    if (!_featureMarqueeView) {
        _featureMarqueeView = [[KBKeyboardSubscriptionFeatureMarqueeView alloc] init];
    }
    return _featureMarqueeView;
}

- (UICollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
        layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _collectionView.backgroundColor = [UIColor clearColor];
        _collectionView.showsHorizontalScrollIndicator = NO;
        _collectionView.dataSource = self;
        _collectionView.delegate = self;
        [_collectionView registerClass:KBKeyboardSubscriptionOptionCell.class forCellWithReuseIdentifier:kKBKeyboardSubscriptionCellId];
    }
    return _collectionView;
}

- (UIButton *)purchaseButton {
    if (!_purchaseButton) {
        _purchaseButton = [UIButton buttonWithType:UIButtonTypeSystem];
        _purchaseButton.layer.cornerRadius = 26;
        _purchaseButton.layer.masksToBounds = YES;
        [_purchaseButton setTitle:KBLocalized(@"Recharge Now") forState:UIControlStateNormal];
        _purchaseButton.titleLabel.font = [UIFont systemFontOfSize:16 weight:UIFontWeightSemibold];
        [_purchaseButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [_purchaseButton setBackgroundImage:[self imageWithColor:[UIColor colorWithHex:0x02BEAC]] forState:UIControlStateNormal];
        [_purchaseButton addTarget:self action:@selector(onTapPurchase) forControlEvents:UIControlEventTouchUpInside];
    }
    return _purchaseButton;
}

- (UILabel *)agreementLabel {
    if (!_agreementLabel) {
        _agreementLabel = [[UILabel alloc] init];
        _agreementLabel.text = KBLocalized(@"By clicking \"pay\", you agree to the");
        _agreementLabel.font = [UIFont systemFontOfSize:11];
        _agreementLabel.textColor = [UIColor colorWithHex:0x4A4A4A];
    }
    return _agreementLabel;
}

- (UIButton *)agreementButton {
    if (!_agreementButton) {
        _agreementButton = [UIButton buttonWithType:UIButtonTypeSystem];
        [_agreementButton setTitle:KBLocalized(@"Membership Agreement") forState:UIControlStateNormal];
        _agreementButton.titleLabel.font = [UIFont systemFontOfSize:11 weight:UIFontWeightSemibold];
        [_agreementButton setTitleColor:[UIColor colorWithHex:0x02BEAC] forState:UIControlStateNormal];
        [_agreementButton addTarget:self action:@selector(onTapAgreement) forControlEvents:UIControlEventTouchUpInside];
    }
    return _agreementButton;
}

- (UIActivityIndicatorView *)loadingIndicator {
    if (!_loadingIndicator) {
        _loadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleMedium];
        _loadingIndicator.hidesWhenStopped = YES;
    }
    return _loadingIndicator;
}

- (UILabel *)emptyLabel {
    if (!_emptyLabel) {
        _emptyLabel = [[UILabel alloc] init];
        _emptyLabel.text = KBLocalized(@"No products available");
        _emptyLabel.font = [UIFont systemFontOfSize:13];
        _emptyLabel.textColor = [[UIColor blackColor] colorWithAlphaComponent:0.4];
        _emptyLabel.textAlignment = NSTextAlignmentCenter;
        _emptyLabel.hidden = YES;
    }
    return _emptyLabel;
}

- (UIImage *)imageWithColor:(UIColor *)color {
    CGSize size = CGSizeMake(1, 1);
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    [color setFill];
    UIRectFill(CGRectMake(0, 0, size.width, size.height));
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

@end