passepartout-apple/Passepartout/Library/Sources/UtilsLibrary/Views/MailComposerView.swift

//
//  MailComposerView.swift
//  Passepartout
//
//  Created by Davide De Rosa on 3/23/22.
//  Copyright (c) 2024 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/>.
//

#if os(iOS)

import MessageUI
import SwiftUI

public struct MailComposerView: UIViewControllerRepresentable {
    public struct Attachment {
        public let data: Data

        public let mimeType: String

        public let fileName: String

        public init(data: Data, mimeType: String, fileName: String) {
            self.data = data
            self.mimeType = mimeType
            self.fileName = fileName
        }
    }

    public static func canSendMail() -> Bool {
        MFMailComposeViewController.canSendMail()
    }

    @Binding
    public var isPresented: Bool

    public let toRecipients: [String]

    public let subject: String

    public let messageBody: String

    public var attachments: [Attachment]?

    public init(
        isPresented: Binding<Bool>,
        toRecipients: [String],
        subject: String,
        messageBody: String,
        attachments: [Attachment]? = nil
    ) {
        _isPresented = isPresented
        self.toRecipients = toRecipients
        self.subject = subject
        self.messageBody = messageBody
        self.attachments = attachments
    }

    public func makeUIViewController(context: UIViewControllerRepresentableContext<MailComposerView>) -> MFMailComposeViewController {
        let vc = MFMailComposeViewController()
        vc.setToRecipients(toRecipients)
        vc.setSubject(subject)
        vc.setMessageBody(messageBody, isHTML: false)
        attachments?.forEach {
            vc.addAttachmentData($0.data, mimeType: $0.mimeType, fileName: $0.fileName)
        }
        vc.mailComposeDelegate = context.coordinator
        return vc
    }

    public func updateUIViewController(_ uiViewController: MFMailComposeViewController, context: UIViewControllerRepresentableContext<MailComposerView>) {
    }

    public func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
}

extension MailComposerView {
    public final class Coordinator: NSObject, MFMailComposeViewControllerDelegate {

        @Binding
        private var isPresented: Bool

        fileprivate init(_ view: MailComposerView) {
            _isPresented = view._isPresented
        }

        public func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
            isPresented = false
        }
    }
}

#endif