//
//  KBJfPay.m
//  keyBoard

#import "KBJfPay.h"
#import "KBJfPayCell.h"
#import "FGIAPProductsFilter.h"
#import "FGIAPManager.h"
#import "PayVM.h"
#import "KBPayProductModel.h"
#import "KBBizCode.h"
#import "KBShopVM.h"
#import "IAPVerifyTransactionObj.h"
static NSString * const kKBJfPayCellId = @"kKBJfPayCellId";

@interface KBJfPay () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

@property (nonatomic, strong) UIImageView *bgImageView;  // 全屏背景图


// 顶部信息
@property (nonatomic, strong) UILabel *myPointsTitleLabel;    // “My Points”
@property (nonatomic, strong) UILabel *pointsLabel;           // 积分数值
@property (nonatomic, strong) UIImageView *bigCoinImageView;  // 右上装饰大金币 pay_big_icon

// “Recharge Now” 小标题
@property (nonatomic, strong) UIImageView *smallLeftIcon;     // 左侧小金币 shop_jb_icon
@property (nonatomic, strong) UILabel *rechargeLabel;         // “Recharge Now”

// 列表容器（因为需要只有左上/右上圆角）
@property (nonatomic, strong) UIView *listContainerView;      // 承载 collectionView
@property (nonatomic, strong) UICollectionView *collectionView;

// 底部按钮/协议
@property (nonatomic, strong) UIButton *payButton;            // 充值按钮
@property (nonatomic, strong) UILabel *agreementLabel;        // 协议提示
@property (nonatomic, strong) UIButton *agreementButton;

// 数据
@property (nonatomic, strong) NSArray<KBPayProductModel *> *data;  // In-App 商品展示数据
@property (nonatomic, assign) NSInteger selectedIndex;        // 当前选中项

@property (nonatomic, strong) FGIAPProductsFilter *filter;
@property (nonatomic, strong) PayVM *payVM;
@property (nonatomic, strong) KBShopVM *shopVM;

@end

@implementation KBJfPay

- (void)viewDidLoad {
    [super viewDidLoad];
    self.filter = [[FGIAPProductsFilter alloc] init];
    self.payVM = [PayVM new];
    self.shopVM = [KBShopVM new];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(handleIAPPurchaseSuccess)
                                                 name:KBIAPDidCompletePurchaseNotification
                                               object:nil];
    self.data = @[];
    self.selectedIndex = NSNotFound;
    self.bgImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"my_bg_icon"]];
    self.bgImageView.contentMode = UIViewContentModeScaleAspectFill;
    self.kb_navView.backgroundColor = [UIColor clearColor];
    [self.view insertSubview:self.bgImageView belowSubview:self.kb_navView];
    [self.bgImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self.view);
    }];
    self.kb_titleLabel.text = KBLocalized(@"Points Recharge");

    // 视图组装
    [self.view addSubview:self.myPointsTitleLabel];
    [self.view addSubview:self.pointsLabel];
    
    [self.view addSubview:self.listContainerView];
    [self.view addSubview:self.bigCoinImageView];
    [self.listContainerView addSubview:self.smallLeftIcon];
    [self.listContainerView addSubview:self.rechargeLabel];
    [self.listContainerView addSubview:self.collectionView];
    [self.view addSubview:self.payButton];
    [self.view addSubview:self.agreementLabel];
    [self.view addSubview:self.agreementButton];


    // 布局（mas）
    [self.myPointsTitleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.view).offset(16);
        make.top.equalTo(self.view).offset(KB_NAV_TOTAL_HEIGHT + 40);
    }];
    [self.pointsLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.myPointsTitleLabel);
        make.top.equalTo(self.myPointsTitleLabel.mas_bottom).offset(4);
    }];
    [self.bigCoinImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.view).offset(-12);
        make.top.equalTo(self.view).offset(KB_NAV_TOTAL_HEIGHT + 10);
        make.width.mas_equalTo(131);
        make.height.mas_equalTo(144);
    }];
    
    // 列表容器 + 圆角（仅左上/右上）
    [self.listContainerView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self.view);
        make.top.mas_equalTo(KB_NAV_TOTAL_HEIGHT + 123);
        make.bottom.equalTo(self.payButton.mas_top).offset(-16);
        make.height.greaterThanOrEqualTo(@220);
    }];
    
    [self.smallLeftIcon mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.listContainerView).offset(16);
        make.top.equalTo(self.listContainerView).offset(16);
        make.width.height.mas_equalTo(20);
    }];
    [self.rechargeLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(self.smallLeftIcon);
        make.left.equalTo(self.smallLeftIcon.mas_right).offset(8);
    }];

    
    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.left.right.equalTo(self.listContainerView).inset(16);
        make.top.equalTo(self.smallLeftIcon.mas_bottom).offset(19);
    }];

    [self.agreementButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.bottom.equalTo(self.view).offset(-KB_SAFE_BOTTOM - 15);
    }];
    [self.agreementLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.bottom.equalTo(self.agreementButton.mas_top).offset(0);
    }];
    
    // 底部按钮
    [self.payButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.view).offset(24);
        make.right.equalTo(self.view).offset(-24);
        make.bottom.equalTo(self.agreementLabel.mas_top).offset(-14);
        make.height.mas_equalTo(58);
    }];
    

    // 刷新
    [self.collectionView reloadData];

    [self fetchInAppProductList];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self fetchWalletBalance];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self selectItemAtCurrentIndexAnimated:NO];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

#pragma mark - UICollectionView Delegate (ensure first show)
- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
    if (![cell isKindOfClass:KBJfPayCell.class]) { return; }
    KBJfPayCell *c = (KBJfPayCell *)cell;
    BOOL sel = (self.selectedIndex != NSNotFound && indexPath.item == self.selectedIndex);
    if (sel) {
        [collectionView selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];
    }
    [c applySelected:sel animated:NO];
}

#pragma mark - 圆角蒙版
- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    // 仅左上、右上圆角
    UIRectCorner corners = UIRectCornerTopLeft | UIRectCornerTopRight;
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.listContainerView.bounds
                                               byRoundingCorners:corners
                                                     cornerRadii:CGSizeMake(20, 20)];
    CAShapeLayer *mask = [CAShapeLayer layer];
    mask.frame = self.listContainerView.bounds;
    mask.path = path.CGPath;
    self.listContainerView.layer.mask = mask;
}

#pragma mark - UICollectionView
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.data.count;
}

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    KBJfPayCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kKBJfPayCellId forIndexPath:indexPath];
    KBPayProductModel *model = self.data[indexPath.item];
    NSString *coins = [model coinsDisplayText];
    NSString *price = [model priceDisplayText];
    [cell configCoins:coins price:price];
    [cell applySelected:(indexPath.item == self.selectedIndex) animated:NO];
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (self.selectedIndex == indexPath.item) { return; }
    NSInteger old = self.selectedIndex;
    self.selectedIndex = indexPath.item;

    KBJfPayCell *newCell = (KBJfPayCell *)[collectionView cellForItemAtIndexPath:indexPath];
    [newCell applySelected:YES animated:YES];
    if (old >= 0 && old < self.data.count) {
        NSIndexPath *oldIP = [NSIndexPath indexPathForItem:old inSection:0];
        KBJfPayCell *oldCell = (KBJfPayCell *)[collectionView cellForItemAtIndexPath:oldIP];
        [oldCell applySelected:NO animated:YES];
    }
}

// 三列网格
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    CGFloat totalW = collectionView.bounds.size.width;
    CGFloat spacing = 10.0; // 列间距
    CGFloat columns = 3.0;
    CGFloat insets = 0;     // 已在 mas 中留了左右 16，这里内部 cell 不额外 inset
    CGFloat w = floor((totalW - insets - spacing * (columns - 1)) / columns);
    CGFloat h = KBFit(116);
    return CGSizeMake(MAX(0, w), h);
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    return 10.0;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return 30;
}

#pragma mark - Data
- (void)fetchWalletBalance {
    __weak typeof(self) weakSelf = self;
    [self.shopVM fetchWalletBalanceWithCompletion:^(NSString * _Nullable balance, NSError * _Nullable error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            __strong typeof(weakSelf) self = weakSelf;
            if (!self) { return; }
            if (error) {
                NSString *msg = error.localizedDescription ?: KBLocalized(@"Network error");
                [KBHUD showInfo:msg];
                return;
            }
            NSString *displayValue = balance.length ? balance : @"0";
            self.pointsLabel.text = displayValue;
        });
    }];
}

- (void)handleIAPPurchaseSuccess {
    [self fetchWalletBalance];
}

- (void)fetchInAppProductList {
    __weak typeof(self) weakSelf = self;
    [self.payVM fetchInAppProductsNeedShow:YES completion:^(NSInteger sta, NSString * _Nullable msg, NSArray<KBPayProductModel *> * _Nullable products) {
        dispatch_async(dispatch_get_main_queue(), ^{
            __strong typeof(weakSelf) self = weakSelf;
            if (!self) { return; }
            if (sta != KBBizCodeSuccess || ![products isKindOfClass:NSArray.class]) {
                self.data = @[];
                self.selectedIndex = NSNotFound;
                [self.collectionView reloadData];
                NSString *tip = msg.length ? msg : KBLocalized(@"Failed to load products");
                [KBHUD showInfo:tip];
                return;
            }
            self.data = products ?: @[];
            self.selectedIndex = self.data.count > 0 ? 0 : NSNotFound;
            [self.collectionView reloadData];
            [self selectItemAtCurrentIndexAnimated:NO];
        });
    }];
}

- (KBPayProductModel *)currentSelectedProductItem {
    if (self.selectedIndex == NSNotFound) { return nil; }
    if (self.selectedIndex < 0 || self.selectedIndex >= self.data.count) { return nil; }
    id item = self.data[self.selectedIndex];
    if (![item isKindOfClass:KBPayProductModel.class]) { return nil; }
    return item;
}

- (void)selectItemAtCurrentIndexAnimated:(BOOL)animated {
    if (self.selectedIndex == NSNotFound) { return; }
    if (self.selectedIndex < 0 || self.selectedIndex >= self.data.count) { return; }
    NSIndexPath *ip = [NSIndexPath indexPathForItem:self.selectedIndex inSection:0];
    if (!ip) { return; }
    dispatch_async(dispatch_get_main_queue(), ^{
        if (self.selectedIndex == NSNotFound) { return; }
        if ([self.collectionView numberOfItemsInSection:0] <= ip.item) { return; }
        [self.collectionView selectItemAtIndexPath:ip animated:animated scrollPosition:UICollectionViewScrollPositionNone];
        KBJfPayCell *cell = (KBJfPayCell *)[self.collectionView cellForItemAtIndexPath:ip];
        if ([cell isKindOfClass:KBJfPayCell.class]) {
            [cell applySelected:YES animated:animated];
        }
    });
}

#pragma mark - Actions
- (void)onTapPayButton {
    KBPayProductModel *selectedItem = [self currentSelectedProductItem];
    if (!selectedItem) {
        [KBHUD showInfo:KBLocalized(@"Please select a product")];
        return;
    }
    NSString *productId = selectedItem.productId;
    if (productId.length == 0) {
        [KBHUD showInfo:KBLocalized(@"Product unavailable")];
        return;
    }
    [KBHUD show];
    __weak typeof(self) weakSelf = self;
    [self.filter requestProductsWith:[NSSet setWithObject:productId] completion:^(NSArray<SKProduct *> * _Nonnull products) {
        dispatch_async(dispatch_get_main_queue(), ^{
            __strong typeof(weakSelf) self = weakSelf;
            if (!self) { return; }
            SKProduct *match = nil;
            for (SKProduct *product in products) {
                if ([product.productIdentifier isEqualToString:productId]) {
                    match = product;
                    break;
                }
            }
            if (!match) {
                [KBHUD dismiss];
                [KBHUD showInfo:KBLocalized(@"Unable to load product information")];
                return;
            }
            [[FGIAPManager shared].iap buyProduct:match onCompletion:^(NSString * _Nonnull message, FGIAPManagerPurchaseRusult result) {
                dispatch_async(dispatch_get_main_queue(), ^{
//                    [KBHUD dismiss];
                });
            }];
        });
    }];
}

- (void)agreementButtonAction{
    [KBHUD showInfo:KBLocalized(@"Open agreement")];
}

#pragma mark - Lazy UI
- (UILabel *)myPointsTitleLabel {
    if (!_myPointsTitleLabel) {
        _myPointsTitleLabel = [UILabel new];
        _myPointsTitleLabel.text = KBLocalized(@"My Points");
        _myPointsTitleLabel.font = [KBFont medium:14];
        _myPointsTitleLabel.textColor = [UIColor colorWithHex:KBBlackValue];
    }
    return _myPointsTitleLabel;
}

- (UILabel *)pointsLabel {
    if (!_pointsLabel) {
        _pointsLabel = [UILabel new];
        _pointsLabel.text = @"--";
        _pointsLabel.font = [KBFont bold:30];
        _pointsLabel.textColor = [UIColor colorWithHex:KBColorValue];
    }
    return _pointsLabel;
}

- (UIImageView *)bigCoinImageView {
    if (!_bigCoinImageView) {
        _bigCoinImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pay_big_icon"]];
        _bigCoinImageView.contentMode = UIViewContentModeScaleAspectFit;
    }
    return _bigCoinImageView;
}

- (UIImageView *)smallLeftIcon {
    if (!_smallLeftIcon) {
        _smallLeftIcon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"shop_jb_icon"]];
        _smallLeftIcon.contentMode = UIViewContentModeScaleAspectFit;
    }
    return _smallLeftIcon;
}

- (UILabel *)rechargeLabel {
    if (!_rechargeLabel) {
        _rechargeLabel = [UILabel new];
        _rechargeLabel.text = KBLocalized(@"Recharge Now");
//        _rechargeLabel.font = [UIFont systemFontOfSize:16 weight:UIFontWeightSemibold];
        _rechargeLabel.font = [KBFont medium:14];
        _rechargeLabel.textColor = [UIColor colorWithHex:KBBlackValue];
    }
    return _rechargeLabel;
}

- (UIView *)listContainerView {
    if (!_listContainerView) {
        _listContainerView = [UIView new];
        // 轻微底色，突出圆角区域（也可用渐变，按需）
        _listContainerView.backgroundColor = [UIColor colorWithWhite:1 alpha:0.43];
    }
    return _listContainerView;
}

- (UICollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewFlowLayout *layout = [UICollectionViewFlowLayout new];
        layout.scrollDirection = UICollectionViewScrollDirectionVertical;
        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _collectionView.backgroundColor = UIColor.clearColor;
        _collectionView.dataSource = self;
        _collectionView.delegate = self;
        _collectionView.alwaysBounceVertical = YES;
        [_collectionView registerClass:KBJfPayCell.class forCellWithReuseIdentifier:kKBJfPayCellId];
        _collectionView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }
    return _collectionView;
}

- (UIButton *)payButton {
    if (!_payButton) {
        _payButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [_payButton setTitle:KBLocalized(@"Recharge Now") forState:UIControlStateNormal];
        [_payButton setTitleColor:[UIColor colorWithHex:KBBlackValue] forState:UIControlStateNormal];
//        _payButton.titleLabel.font = [UIFont systemFontOfSize:16 weight:UIFontWeightSemibold];
        _payButton.titleLabel.font = [KBFont medium:15];
        // 使用现有的切图（若不存在可退化为渐变图片）
        UIImage *bg = [UIImage imageNamed:@"recharge_now_icon"];
        if (bg) {
            [_payButton setBackgroundImage:bg forState:UIControlStateNormal];
        } else {
            UIImage *fallback = [UIImage kb_gradientImageWithColors:@[[UIColor colorWithHex:0xC7F8F0], [UIColor colorWithHex:0xE8FFF6]] size:CGSizeMake(10, 58) direction:KBGradientDirectionLeftToRight];
            [_payButton setBackgroundImage:[fallback resizableImageWithCapInsets:UIEdgeInsetsMake(29, 29, 29, 29) resizingMode:UIImageResizingModeStretch] forState:UIControlStateNormal];
        }
        [_payButton addTarget:self action:@selector(onTapPayButton) forControlEvents:UIControlEventTouchUpInside];
    }
    return _payButton;
}

- (UILabel *)agreementLabel {
    if (!_agreementLabel) {
        _agreementLabel = [UILabel new];
        
        _agreementLabel.text = KBLocalized(@"By clicking Pay, you indicate your agreement to the"); // 简化文案
//        _agreementLabel.font = [UIFont systemFontOfSize:11 weight:UIFontWeightRegular];
        _agreementLabel.font = [KBFont regular:12];
        _agreementLabel.textColor = [UIColor colorWithWhite:0.45 alpha:1.0];
    }
    return _agreementLabel;
}
- (UIButton *)agreementButton {
    if (!_agreementButton) {
        _agreementButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [_agreementButton setTitle:KBLocalized(@"《Embership Agreement》") forState:UIControlStateNormal];
        [_agreementButton setTitleColor:[UIColor colorWithHex:KBColorValue] forState:UIControlStateNormal];
//        _agreementButton.titleLabel.font = [UIFont systemFontOfSize:10 weight:UIFontWeightSemibold];
        _agreementButton.titleLabel.font = [KBFont regular:12];
        [_agreementButton addTarget:self action:@selector(agreementButtonAction) forControlEvents:UIControlEventTouchUpInside];
    }
    return _agreementButton;
}

@end