import Foundation
import UIKit
import SwiftSignalKit
import TelegramCore
import TelegramUIPreferences

public final class MediaPlaybackStoredState: Codable {
    public let timestamp: Double
    public let playbackRate: AudioPlaybackRate
    
    public init(timestamp: Double, playbackRate: AudioPlaybackRate) {
        self.timestamp = timestamp
        self.playbackRate = playbackRate
    }
    
    public init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: StringCodingKey.self)

        self.timestamp = try container.decode(Double.self, forKey: "timestamp")
        self.playbackRate = AudioPlaybackRate(rawValue: try container.decode(Int32.self, forKey: "playbackRate"))
    }
    
    public func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: StringCodingKey.self)

        try container.encode(self.timestamp, forKey: "timestamp")
        try container.encode(self.playbackRate.rawValue, forKey: "playbackRate")
    }
}

public func mediaPlaybackStoredState(engine: TelegramEngine, messageId: EngineMessage.Id) -> Signal<MediaPlaybackStoredState?, NoError> {
    let key = EngineDataBuffer(length: 20)
    key.setInt32(0, value: messageId.namespace)
    key.setInt32(4, value: messageId.peerId.namespace._internalGetInt32Value())
    key.setInt64(8, value: messageId.peerId.id._internalGetInt64Value())
    key.setInt32(16, value: messageId.id)
    
    return engine.data.get(TelegramEngine.EngineData.Item.ItemCache.Item(collectionId: ApplicationSpecificItemCacheCollectionId.mediaPlaybackStoredState, id: key))
    |> map { entry -> MediaPlaybackStoredState? in
        return entry?.get(MediaPlaybackStoredState.self)
    }
}

public func updateMediaPlaybackStoredStateInteractively(engine: TelegramEngine, messageId: EngineMessage.Id, state: MediaPlaybackStoredState?) -> Signal<Never, NoError> {
    let key = EngineDataBuffer(length: 20)
    key.setInt32(0, value: messageId.namespace)
    key.setInt32(4, value: messageId.peerId.namespace._internalGetInt32Value())
    key.setInt64(8, value: messageId.peerId.id._internalGetInt64Value())
    key.setInt32(16, value: messageId.id)
    
    if let state = state {
        return engine.itemCache.put(collectionId: ApplicationSpecificItemCacheCollectionId.mediaPlaybackStoredState, id: key, item: state)
    } else {
        return engine.itemCache.remove(collectionId: ApplicationSpecificItemCacheCollectionId.mediaPlaybackStoredState, id: key)
    }
}