import Foundation
import Postbox
import SwiftSignalKit
import TelegramApi
import MtProtoKit

func _internal_translate(network: Network, text: String, fromLang: String?, toLang: String) -> Signal<String?, NoError> {
    var flags: Int32 = 0
    flags |= (1 << 1)
    if let _ = fromLang {
        flags |= (1 << 2)
    }
    
    return network.request(Api.functions.messages.translateText(flags: flags, peer: nil, msgId: nil, text: text, fromLang: fromLang, toLang: toLang))
    |> map(Optional.init)
    |> `catch` { _ -> Signal<Api.messages.TranslatedText?, NoError> in
        return .single(nil)
    }
    |> mapToSignal { result -> Signal<String?, NoError> in
        guard let result = result else {
            return .complete()
        }
        switch result {
            case .translateNoResult:
                return .single(nil)
            case let .translateResultText(text):
                return .single(text)
        }
    }
}

public enum EngineAudioTranscriptionResult {
    case success
    case error
}

func _internal_transcribeAudio(postbox: Postbox, network: Network, messageId: MessageId) -> Signal<EngineAudioTranscriptionResult, NoError> {
    return postbox.transaction { transaction -> Api.InputPeer? in
        return transaction.getPeer(messageId.peerId).flatMap(apiInputPeer)
    }
    |> mapToSignal { inputPeer -> Signal<EngineAudioTranscriptionResult, NoError> in
        guard let inputPeer = inputPeer else {
            return .single(.error)
        }
        return network.request(Api.functions.messages.transcribeAudio(peer: inputPeer, msgId: messageId.id))
        |> map { result -> Result<Api.messages.TranscribedAudio, AudioTranscriptionMessageAttribute.TranscriptionError> in
            return .success(result)
        }
        |> `catch` { error -> Signal<Result<Api.messages.TranscribedAudio, AudioTranscriptionMessageAttribute.TranscriptionError>, NoError> in
            let mappedError: AudioTranscriptionMessageAttribute.TranscriptionError
            if error.errorDescription == "MSG_VOICE_TOO_LONG" {
                mappedError = .tooLong
            } else {
                mappedError = .generic
            }
            return .single(.failure(mappedError))
        }
        |> mapToSignal { result -> Signal<EngineAudioTranscriptionResult, NoError> in
            return postbox.transaction { transaction -> EngineAudioTranscriptionResult in
                let updatedAttribute: AudioTranscriptionMessageAttribute
                switch result {
                case let .success(transcribedAudio):
                    switch transcribedAudio {
                    case let .transcribedAudio(flags, transcriptionId, text):
                        let isPending = (flags & (1 << 0)) != 0
                        
                        updatedAttribute = AudioTranscriptionMessageAttribute(id: transcriptionId, text: text, isPending: isPending, didRate: false, error: nil)
                    }
                case let .failure(error):
                    updatedAttribute = AudioTranscriptionMessageAttribute(id: 0, text: "", isPending: false, didRate: false, error: error)
                }
                    
                transaction.updateMessage(messageId, update: { currentMessage in
                    let storeForwardInfo = currentMessage.forwardInfo.flatMap(StoreMessageForwardInfo.init)
                    var attributes = currentMessage.attributes.filter { !($0 is AudioTranscriptionMessageAttribute) }
                    
                    attributes.append(updatedAttribute)
                    
                    return .update(StoreMessage(id: currentMessage.id, globallyUniqueId: currentMessage.globallyUniqueId, groupingKey: currentMessage.groupingKey, threadId: currentMessage.threadId, timestamp: currentMessage.timestamp, flags: StoreMessageFlags(currentMessage.flags), tags: currentMessage.tags, globalTags: currentMessage.globalTags, localTags: currentMessage.localTags, forwardInfo: storeForwardInfo, authorId: currentMessage.author?.id, text: currentMessage.text, attributes: attributes, media: currentMessage.media))
                })
                
                if updatedAttribute.error == nil {
                    return .success
                } else {
                    return .error
                }
            }
        }
    }
}

func _internal_rateAudioTranscription(postbox: Postbox, network: Network, messageId: MessageId, id: Int64, isGood: Bool) -> Signal<Never, NoError> {
    return postbox.transaction { transaction -> Api.InputPeer? in
        transaction.updateMessage(messageId, update: { currentMessage in
            var storeForwardInfo: StoreMessageForwardInfo?
            if let forwardInfo = currentMessage.forwardInfo {
                storeForwardInfo = StoreMessageForwardInfo(authorId: forwardInfo.author?.id, sourceId: forwardInfo.source?.id, sourceMessageId: forwardInfo.sourceMessageId, date: forwardInfo.date, authorSignature: forwardInfo.authorSignature, psaType: forwardInfo.psaType, flags: forwardInfo.flags)
            }
            var attributes = currentMessage.attributes
            for i in 0 ..< attributes.count {
                if let attribute = attributes[i] as? AudioTranscriptionMessageAttribute {
                    attributes[i] = attribute.withDidRate()
                }
            }
            return .update(StoreMessage(
                id: currentMessage.id,
                globallyUniqueId: currentMessage.globallyUniqueId,
                groupingKey: currentMessage.groupingKey,
                threadId: currentMessage.threadId,
                timestamp: currentMessage.timestamp,
                flags: StoreMessageFlags(currentMessage.flags),
                tags: currentMessage.tags,
                globalTags: currentMessage.globalTags,
                localTags: currentMessage.localTags,
                forwardInfo: storeForwardInfo,
                authorId: currentMessage.author?.id,
                text: currentMessage.text,
                attributes: attributes,
                media: currentMessage.media
            ))
        })
        
        return transaction.getPeer(messageId.peerId).flatMap(apiInputPeer)
    }
    |> mapToSignal { inputPeer -> Signal<Never, NoError> in
        guard let inputPeer = inputPeer else {
            return .complete()
        }
        return network.request(Api.functions.messages.rateTranscribedAudio(peer: inputPeer, msgId: messageId.id, transcriptionId: id, good: isGood ? .boolTrue : .boolFalse))
        |> `catch` { _ -> Signal<Api.Bool, NoError> in
            return .single(.boolFalse)
        }
        |> ignoreValues
    }
}