//
//  PurchaseButtonView.swift
//  Feels
//
//  Created by Trey Tartt on 7/7/22.
//

import SwiftUI
import StoreKit

struct PurchaseButtonView: View {
    enum ViewStatus: String {
        case needToBuy
        case error
        case success
        case subscribed
    }
    @AppStorage(UserDefaultsStore.Keys.theme.rawValue, store: GroupUserDefaults.groupDefaults) private var theme: Theme = .system
    @AppStorage(UserDefaultsStore.Keys.textColor.rawValue, store: GroupUserDefaults.groupDefaults) private var textColor: Color = DefaultTextColor.textColor
    var iapManager: IAPManager
    
    private let height: Float
    private let showManageSubClosure: (() -> Void)?

    @State var isPurchasing: Bool = false
    
    @State private var viewStatus: ViewStatus = .needToBuy {
        didSet {
            isPurchasing = false
        }
    }
        
    public init(height: Float, iapManager: IAPManager, showManageSubClosure: (() -> Void)? = nil) {
        self.height = height
        self.showManageSubClosure = showManageSubClosure
        self.iapManager = iapManager
    }
    
    var body: some View {
        ZStack {
            switch viewStatus {
            case .needToBuy, .error:
                buyOptionsView
                    .frame(height: CGFloat(height))
                    .background(theme.currentTheme.secondaryBGColor)
            case .success:
                subscribedView
                    .frame(height: CGFloat(height))
                    .background(theme.currentTheme.secondaryBGColor)
            case .subscribed:
                subscribedView
                    .frame(height:  CGFloat(height))
                    .background(theme.currentTheme.secondaryBGColor)
            }
        }
        .onAppear{
            if let _ = iapManager.currentSubscription {
                viewStatus = .subscribed
            }
        }
    }
    
    private var buyOptionsSetingsView: some View {
        GeometryReader { metrics in
            VStack(spacing: 20) {
                Text(String(localized: "purchase_view_title"))
                    .foregroundColor(textColor)
                    .frame(minWidth: 0, maxWidth: .infinity, alignment: .leading)
                    .frame(height: 50)
                    .padding([.leading, .trailing])
                VStack(alignment: .leading) {
                    ForEach(iapManager.sortedSubscriptionKeysByPriceOptions, id: \.self) { product in
                        HStack {
                            Button(action: {
                                purchase(product: product)
                            }, label: {
                                Text("\(product.displayPrice)\n\(product.displayName)")
                                    .foregroundColor(.white)
                                    .bold()
                                    .frame(maxWidth: .infinity)
                                    .contentShape(Rectangle())
                            })
                            .frame(maxWidth: .infinity)
                            .frame(height: 50)
                            .padding()
                            .background(RoundedRectangle(cornerRadius: 10).fill(iapManager.colorForIAPButton(iapIdentifier: product.id)))
                        }
                    }
                }
                .padding([.leading, .leading])
            }
        }
    }
    
    private var buyOptionsView: some View {
        VStack {
            ZStack {
                VStack(spacing: 20) {
                    Text(String(localized: "purchase_view_title"))
                        .font(.body)
                        .bold()
                        .foregroundColor(textColor)
                        .frame(minWidth: 0, maxWidth: .infinity, alignment: .leading)
                    
                    HStack {
                        ForEach(iapManager.sortedSubscriptionKeysByPriceOptions) { product in
                            Button(action: {
                                purchase(product: product)
                            }, label: {
                                Text("\(product.displayPrice)\n\(product.displayName)")
                                    .foregroundColor(.white)
                                    .bold()
                                    .frame(maxWidth: .infinity)
                                    .contentShape(Rectangle())
                            })
                            .padding()
                            .frame(maxWidth: .infinity)
                            .background(RoundedRectangle(cornerRadius: 10).fill(iapManager.colorForIAPButton(iapIdentifier: product.id)))
                        }
                    }
                }
                .padding([.leading, .trailing])
                .frame(minWidth: 0, maxWidth: .infinity)
                
            }
            .background(.ultraThinMaterial)
            .frame(minWidth: 0, maxWidth: .infinity)
        }
        .background(.clear)
    }
    
    private var successView: some View {
        HStack {
            Text("it worked")
        }
        .background(.green)
    }
    
    private var errorView: some View {
        HStack {
            Text("something broke")
        }
        .background(.red)
    }
    
    private var subscribedView: some View {
        VStack(alignment: .leading) {
            Text(String(localized: "purchase_view_current_subscription"))
                .font(.title3)
                .padding(.leading)
            
            Divider()
            
            if let currentProduct = iapManager.currentSubscription,
               let value = iapManager.subscriptions[currentProduct] {
                HStack {
                    VStack (alignment: .leading, spacing: 10) {
                        Text(currentProduct.displayName)
                            .font(.title3)
                        Text(currentProduct.displayPrice)
                            .font(.title3)
                    }.padding([.leading, .trailing])
                    
                    ForEach(value!.status, id: \.self) { singleStatus in
                        StatusInfoView(product: currentProduct, status: singleStatus)
                            .padding([.leading])
                            .font(.body)
                    }
                }
            }
            
            Button(action: {
                showManageSubClosure?()
            }, label: {
                Text(String(localized: "purchase_view_cancel"))
                    .foregroundColor(.red)
            })
            .frame(maxWidth: .infinity)
            .padding([.bottom])
            .multilineTextAlignment(.center)
            
            Divider()
            
           showOtherSubOptions
        }
    }
    
    private var showOtherSubOptions: some View {
        VStack (spacing: 10) {
            HStack {
                ForEach(iapManager.sortedSubscriptionKeysByPriceOptions, id: \.self) { product in
                    if product.id != iapManager.nextRenewllOption?.id {
                        Button(action: {
                            purchase(product: product)
                        }, label: {
                            Text("\(product.displayPrice)\n\(product.displayName)")
                                .foregroundColor(.white)
                                .font(.headline)
                        })
                        .contentShape(Rectangle())
                        .padding()
                        .frame(maxWidth: .infinity)
                        .background(RoundedRectangle(cornerRadius: 10).fill(iapManager.colorForIAPButton(iapIdentifier: product.id)))
                    }
                }
            }
        }
        .padding([.leading, .trailing])
    }
    
    private var purchasingView: some View {
        HStack {
            Text("purcasing")
        }
        .background(.yellow)
    }
    
    private func purchase(product: Product) {
        isPurchasing = true
        Task {
            do {
                if let _ = try await iapManager.purchase(product) {
                    viewStatus = .success
                }
            } catch {
                viewStatus = .error
            }
        }
    }
}

struct PurchaseButtonView_Previews: PreviewProvider {
    static var previews: some View {
        PurchaseButtonView(height: 175, iapManager: IAPManager())
    }
}