//
//  InfoMenu.swift
//  Passepartout
//
//  Created by Davide De Rosa on 4/18/22.
//  Copyright (c) 2022 Davide De Rosa. All rights reserved.
//
//  https://github.com/passepartoutvpn
//
//  This file is part of Passepartout.
//
//  Passepartout is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  Passepartout is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with Passepartout.  If not, see <http://www.gnu.org/licenses/>.
//

import SwiftUI
import PassepartoutLibrary

struct InfoMenu: View {
    enum ModalType: Identifiable {
        case donate
        
        case share([Any])

        case about
        
        case exportProviders([URL])
        
        // XXX: alert ids
        var id: Int {
            switch self {
            case .donate: return 4
                
            case .share: return 5
                
            case .about: return 6
                
            case .exportProviders: return 7
            }
        }
    }
    
    @ObservedObject private var productManager: ProductManager
    
    @State private var modalType: ModalType?
    
    private var isTestBuild: Bool {
        Constants.App.isBeta || Constants.InApp.appType == .beta
    }
    
    private let redditURL = Constants.URLs.subreddit
    
    private let shareMessage = L10n.Global.Messages.share

    private let appName = Unlocalized.appName

    init() {
        productManager = .shared
    }
    
    var body: some View {
        Menu {
            Menu(L10n.Menu.All.Support.title) {
                supportMenu
            }
            Menu(L10n.Menu.All.Share.title) {
                shareMenu
            }
            if isTestBuild {
                Divider()
                testSection
            }
            Divider()
            aboutButton
        } label: {
            themeInfoMenuImage.asSystemImage
        }.sheet(item: $modalType, content: presentedModal)
    }
    
    @ViewBuilder
    private func presentedModal(_ modalType: ModalType) -> some View {
        switch modalType {
        case .donate:
            NavigationView {
                DonateView()
            }.themeGlobal()

        case .share(let items):
            ActivityView(activityItems: items)

        case .about:
            NavigationView {
                AboutView()
            }.themeGlobal()
            
        case .exportProviders(let urls):
            ActivityView(activityItems: urls)
        }
    }
    
    private var isModalPresented: Binding<Bool> {
        .init {
            modalType != nil
        } set: {
            if !$0 {
                modalType = nil
            }
        }
    }


    private var supportMenu: some View {
        Group {
            Button {
                modalType = .donate
            } label: {
                Label(L10n.Donate.title, systemImage: themeDonateImage)
            }.disabled(!productManager.canMakePayments())

            Button {
                URL.openURL(redditURL)
            } label: {
                Label(L10n.Menu.Contextual.Support.joinCommunity, systemImage: themeRedditImage)
            }
            Button(action: submitReview) {
                Label(L10n.Menu.Contextual.Support.writeReview, systemImage: themeWriteReviewImage)
            }
        }
    }

    private var shareMenu: some View {
        Group {
            Button(L10n.Menu.Contextual.shareTwitter, action: shareOnTwitter)
            Button(L10n.Menu.Contextual.shareGeneric, action: shareWithFriend)
        }
    }
    
    private var aboutButton: some View {
        Button(L10n.Menu.All.About.title("")) {
            presentAbout()
        }
    }

    private func shareOnTwitter() {
        let url = Unlocalized.Social.twitterIntent(withMessage: shareMessage)
        URL.openURL(url)
    }

    private func shareWithFriend() {
        let shareMessage = "\(shareMessage) \(Constants.URLs.website)"
        modalType = .share([shareMessage])
    }

    private func submitReview() {
        let reviewURL = Reviewer.urlForReview(withAppId: Constants.App.appStoreId)
        URL.openURL(reviewURL)
    }
    
    private func presentAbout() {
        modalType = .about
    }
}

extension InfoMenu {
    private var testSection: some View {
        Button("Export providers") {
            guard let urls = CoreContext.shared.urlsForProviders else {
                return
            }
            modalType = .exportProviders(urls)
        }
    }
}