// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.

import Foundation
import Sodium
import SessionSnodeKit
import SessionUtilitiesKit

// MARK: - Dependencies

public class Dependencies {
    private var _api: OnionRequestAPIType.Type?
    public var api: OnionRequestAPIType.Type {
        get { getValueSettingIfNull(&_api) { OnionRequestAPI.self } }
        set { _api = newValue }
    }
    
    private var _storage: SessionMessagingKitStorageProtocol?
    public var storage: SessionMessagingKitStorageProtocol {
        get { getValueSettingIfNull(&_storage) { SNMessagingKitConfiguration.shared.storage } }
        set { _storage = newValue }
    }
    
    private var _sodium: SodiumType?
    public var sodium: SodiumType {
        get { getValueSettingIfNull(&_sodium) { Sodium() } }
        set { _sodium = newValue }
    }
    
    private var _aeadXChaCha20Poly1305Ietf: AeadXChaCha20Poly1305IetfType?
    public var aeadXChaCha20Poly1305Ietf: AeadXChaCha20Poly1305IetfType {
        get { getValueSettingIfNull(&_aeadXChaCha20Poly1305Ietf) { sodium.getAeadXChaCha20Poly1305Ietf() } }
        set { _aeadXChaCha20Poly1305Ietf = newValue }
    }
    
    private var _sign: SignType?
    public var sign: SignType {
        get { getValueSettingIfNull(&_sign) { sodium.getSign() } }
        set { _sign = newValue }
    }
    
    private var _genericHash: GenericHashType?
    public var genericHash: GenericHashType {
        get { getValueSettingIfNull(&_genericHash) { sodium.getGenericHash() } }
        set { _genericHash = newValue }
    }
    
    private var _ed25519: Ed25519Type.Type?
    public var ed25519: Ed25519Type.Type {
        get { getValueSettingIfNull(&_ed25519) { Ed25519.self } }
        set { _ed25519 = newValue }
    }
    
    private var _nonceGenerator16: NonceGenerator16ByteType?
    public var nonceGenerator16: NonceGenerator16ByteType {
        get { getValueSettingIfNull(&_nonceGenerator16) { OpenGroupAPI.NonceGenerator16Byte() } }
        set { _nonceGenerator16 = newValue }
    }
    
    private var _nonceGenerator24: NonceGenerator24ByteType?
    public var nonceGenerator24: NonceGenerator24ByteType {
        get { getValueSettingIfNull(&_nonceGenerator24) { OpenGroupAPI.NonceGenerator24Byte() } }
        set { _nonceGenerator24 = newValue }
    }
    
    private var _standardUserDefaults: UserDefaultsType?
    public var standardUserDefaults: UserDefaultsType {
        get { getValueSettingIfNull(&_standardUserDefaults) { UserDefaults.standard } }
        set { _standardUserDefaults = newValue }
    }
    
    private var _date: Date?
    public var date: Date {
        get { getValueSettingIfNull(&_date) { Date() } }
        set { _date = newValue }
    }
    
    // MARK: - Initialization
    
    public init(
        api: OnionRequestAPIType.Type? = nil,
        storage: SessionMessagingKitStorageProtocol? = nil,
        sodium: SodiumType? = nil,
        aeadXChaCha20Poly1305Ietf: AeadXChaCha20Poly1305IetfType? = nil,
        sign: SignType? = nil,
        genericHash: GenericHashType? = nil,
        ed25519: Ed25519Type.Type? = nil,
        nonceGenerator16: NonceGenerator16ByteType? = nil,
        nonceGenerator24: NonceGenerator24ByteType? = nil,
        standardUserDefaults: UserDefaultsType? = nil,
        date: Date? = nil
    ) {
        _api = api
        _storage = storage
        _sodium = sodium
        _aeadXChaCha20Poly1305Ietf = aeadXChaCha20Poly1305Ietf
        _sign = sign
        _genericHash = genericHash
        _ed25519 = ed25519
        _nonceGenerator16 = nonceGenerator16
        _nonceGenerator24 = nonceGenerator24
        _standardUserDefaults = standardUserDefaults
        _date = date
    }
    
    // MARK: - Convenience
    
    public func with(
        api: OnionRequestAPIType.Type? = nil,
        storage: SessionMessagingKitStorageProtocol? = nil,
        sodium: SodiumType? = nil,
        aeadXChaCha20Poly1305Ietf: AeadXChaCha20Poly1305IetfType? = nil,
        sign: SignType? = nil,
        genericHash: GenericHashType? = nil,
        ed25519: Ed25519Type.Type? = nil,
        nonceGenerator16: NonceGenerator16ByteType? = nil,
        nonceGenerator24: NonceGenerator24ByteType? = nil,
        standardUserDefaults: UserDefaultsType? = nil,
        date: Date? = nil
    ) -> Dependencies {
        return Dependencies(
            api: (api ?? self._api),
            storage: (storage ?? self._storage),
            sodium: (sodium ?? self._sodium),
            aeadXChaCha20Poly1305Ietf: (aeadXChaCha20Poly1305Ietf ?? self._aeadXChaCha20Poly1305Ietf),
            sign: (sign ?? self._sign),
            genericHash: (genericHash ?? self._genericHash),
            ed25519: (ed25519 ?? self._ed25519),
            nonceGenerator16: (nonceGenerator16 ?? self._nonceGenerator16),
            nonceGenerator24: (nonceGenerator24 ?? self._nonceGenerator24),
            standardUserDefaults: (standardUserDefaults ?? self._standardUserDefaults),
            date: (date ?? self._date)
        )
    }
}

// MARK: - Convenience

fileprivate func getValueSettingIfNull<T>(_ maybeValue: inout T?, _ valueGenerator: () -> T) -> T {
    guard let value: T = maybeValue else {
        let value: T = valueGenerator()
        maybeValue = value
        return value
    }
    
    return value
}