//
//  IAPView.swift
//  AIGrammar
//
//  Created by oscar on 2024/7/9.
//
import SwiftUI
import FirebaseAnalytics

struct VIPPaymentView: View {
    @Environment(\.presentationMode) var presentationMode
        
    @State private var showingToast = false
    @State private var toastText = ""

    let features = ["Grammar Check & Spelling Correction", "Words & Dictionary", "Translate"]
    let freeValues = ["2 Times / Day", "2 Times / Day", "2 Times / Day"]
    let premiumValues = ["Unlimited", "Unlimited", "Unlimited"]
    let products = [
        ("Weekly", "$4.99 / week", "Billed as one payment of $4.99", "weekly", IAPProduct.premiumFeature1, "Billed Weekly"),
        ("Monthly", "$9.99 / month", "Billed as one payment of $9.99", "monthly", IAPProduct.premiumFeature2, "Billed Monthly"),
        ("Annual", "$4.16 / month", "Billed as one payment of $49.99", "yearly", IAPProduct.premiumFeature3, "Billed Yearly")
    ]
    
    @State private var selectedProductIndex: Int = 1  // 默认选择第二个商品
    @State private var selectedPlanText: String = "Billed Monthly"
    
    @EnvironmentObject var iapManager: IAPManager // 确保在上级视图中已提供 IAPManager

    var body: some View {
        NavigationView {
            VStack {
                HStack {
                    Text("PREMIUM")
                        .bold()
                        .foregroundColor(Color(red: 1.0, green: 0.8, blue: 0.0)) // 自定义更亮的黄色
                        //.foregroundColor(.yellow)
                        .padding()
                        .background(Color.orange)
                        .cornerRadius(20)
                    Spacer()
                    Button("Close") {
                        presentationMode.wrappedValue.dismiss()
                    }
                }
                .padding()

                List {
                    Section(header: Text("Get Premium Features").font(.headline)) {
                        HStack {
                            Text("Features")
                                .frame(width: 120, alignment: .leading)
                            Spacer()
                            Text("Free")
                                .frame(width: 120, alignment: .center)
                            Spacer()
                            Text("Premium")
                                .frame(width: 80, alignment: .center)
                        }
                        .font(.headline)
                        
                        ForEach(Array(zip(features, zip(freeValues, premiumValues))), id: \.0) { item in
                            HStack {
                                Text(item.0)
                                    .frame(width: 120, alignment: .leading)
                                Spacer()
                                Text(item.1.0)  // Free values
                                    .frame(width: 120, alignment: .center)
                                Spacer()
                                Text(item.1.1)  // Premium values
                                    .frame(width: 80, alignment: .center)
                            }
                            .font(.subheadline)
                        }
                    }
                }
                
                VStack(alignment: .leading) { // 使用 VStack 包装整个 ForEach 循环，并指定左对齐
                    ForEach(products.indices, id: \.self) { index in
                        Button(action: {
                            // do someting
                        }) {
                            HStack() {
                                Image(systemName: selectedProductIndex == index ? "checkmark.circle.fill" : "circle")
                                    .foregroundColor(selectedProductIndex == index ? .green : .secondary)
                                    .padding(.horizontal, 4)
                                
                                VStack(alignment: .leading) {
                                    if products[index].0 == "Annual" {
                                        // 特别为 "Premium Yearly" 添加图标和折扣信息
                                        Text(products[index].0) + Text(" ⚡️") + Text(" 58% off")
                                            .bold()
                                            .foregroundColor(.red)  // 折扣信息使用红色
                                            .font(.subheadline)
                                    } else {
                                        Text(products[index].0)
                                    }
                                    Text(products[index].1)
                                        .font(.caption)
                                    Text(products[index].2)
                                        .font(.subheadline)
                                }
                                .frame(maxWidth: .infinity, alignment: .leading) // 使每个 HStack 占据整个宽度，并左对齐
                            }
                            .padding(.vertical, 10)
                            .background(self.selectedProductIndex == index ? Color.yellow : Color.clear)
                            .cornerRadius(5)
                            .padding(.horizontal, 20)  // 增加水平缩进
                            .onTapGesture {
                                self.selectedProductIndex = index
                                self.selectedPlanText = products[index].5
                            }
                        }
                        .frame(maxWidth: .infinity, alignment: .leading) // 使每个 HStack 占据整个宽度，并左对齐
                    }
                }
                .padding(.horizontal, 5)  // 增加水平缩进

                Button("Purchase") {
                    // Handle purchase logic here
                    buyProduct()
                }
                .padding(.vertical, 15)
                .padding(.horizontal, 80)
                .foregroundColor(.white)
                .background(Color.green)
                .cornerRadius(15)
                .frame(minWidth: 0, maxWidth: .infinity)
                .shadow(radius: 2) // 添加阴影效果
                .font(.headline) // 调整字体大小为标题大小
                .padding(.top, 20)

                Text((selectedPlanText ) + ", Cancel Anytime")
                    .font(.footnote)
                    .padding(.vertical, 5)
            }
            .navigationBarHidden(true)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .background(Color(.systemBackground))
        .toast(isPresented: $showingToast, dismissAfter: globalEnvironment.toastPresentMsNormal, onDismiss: {
            // Toast 消失后执行的动作
            presentationMode.wrappedValue.dismiss() // 关闭当前视图
        }) {
            HStack {
                Image(systemName: "exclamationmark.bubble")
                    .foregroundColor(.yellow)
                Text(toastText)
                    .foregroundColor(.black)
            }
            .padding()
            .background(Color.white)
            .cornerRadius(8)
            .shadow(radius: 10)
        }
        
    }
    
    
    private func buyProduct() {
        let productId = products[selectedProductIndex].4
        logger.info("selected productId: \(productId.rawValue)")
        
        // 记录事件
        Analytics.logEvent(globalAnalyticsEvents.eventPurchase, parameters: [
            globalAnalyticsEvents.keyPurchaseItem: productId.rawValue as NSObject,
            globalAnalyticsEvents.keyDeviceID: globalEnvironment.deviceID as NSObject
        ])
        
        if let product = iapManager.products.first(where: { $0.id == productId.rawValue }) {
            Task {
                await iapManager.buy(product: product) { result in
                    switch result {
                    case .success(let message):
                        self.toastText = message
                        self.showingToast = true
                        presentationMode.wrappedValue.dismiss()
                        
                        // 刷新用户的vip状态
                        InitApp.shared.refreshUserInfo()
                    case .failure(let error):
                        self.toastText = error.localizedDescription
                        self.showingToast = true
                    }
                }
            }
        } else {
            logger.error("Product not found")
            toastText = "Error loading product list, please try again later"
            self.showingToast = true
        }
    }
}

struct VIPPaymentView_Previews: PreviewProvider {
    static var previews: some View {
        VIPPaymentView()
    }
}