import Foundation
import UIKit
import Display
import ComponentFlow
import Postbox
import TelegramCore
import SwiftSignalKit
import AccountContext
import TelegramCallsUI
import TelegramPresentationData
import StoryContainerScreen
import ChatEntityKeyboardInputNode

final class CameraLiveStreamComponent: Component {
    let context: AccountContext
    let theme: PresentationTheme
    let strings: PresentationStrings
    let peerId: EnginePeer.Id
    let story: EngineStoryItem?
    let statusBarHeight: CGFloat
    let inputHeight: CGFloat
    let metrics: LayoutMetrics
    let deviceMetrics: DeviceMetrics
    let didSetupMediaStream: (PresentationGroupCall) -> Void
    
    init(
        context: AccountContext,
        theme: PresentationTheme,
        strings: PresentationStrings,
        peerId: EnginePeer.Id,
        story: EngineStoryItem?,
        statusBarHeight: CGFloat,
        inputHeight: CGFloat,
        metrics: LayoutMetrics,
        deviceMetrics: DeviceMetrics,
        didSetupMediaStream: @escaping (PresentationGroupCall) -> Void
    ) {
        self.context = context
        self.theme = theme
        self.strings = strings
        self.peerId = peerId
        self.story = story
        self.statusBarHeight = statusBarHeight
        self.inputHeight = inputHeight
        self.metrics = metrics
        self.deviceMetrics = deviceMetrics
        self.didSetupMediaStream = didSetupMediaStream
    }
    
    static func ==(lhs: CameraLiveStreamComponent, rhs: CameraLiveStreamComponent) -> Bool {
        if lhs.context !== rhs.context {
            return false
        }
        if lhs.theme !== rhs.theme {
            return false
        }
        if lhs.strings !== rhs.strings {
            return false
        }
        if lhs.peerId != rhs.peerId {
            return false
        }
        if lhs.story != rhs.story {
            return false
        }
        if lhs.statusBarHeight != rhs.statusBarHeight {
            return false
        }
        if lhs.inputHeight != rhs.inputHeight {
            return false
        }
        if lhs.metrics != rhs.metrics {
            return false
        }
        if lhs.deviceMetrics != rhs.deviceMetrics {
            return false
        }
        return true
    }
    
    final class View: UIView {
        private var liveChat: ComponentView<Empty>?
        
        private var storyContent: SingleStoryContentContextImpl?
        private var storyContentState: StoryContentContextState?
        private var storyContentDisposable: Disposable?
        
        private let externalState = StoryItemSetContainerComponent.ExternalState()
        private let storyItemSharedState = StoryContentItem.SharedState()
        
        private let inputMediaNodeDataPromise = Promise<ChatEntityKeyboardInputNode.InputData>()
        private let closeFriendsPromise = Promise<[EnginePeer]>()
        private var blockedPeers: BlockedPeersContext?
        
        private var component: CameraLiveStreamComponent?
        private weak var state: EmptyComponentState?
        
        override init(frame: CGRect) {
            super.init(frame: frame)
        }
        
        required init?(coder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }
        
        deinit {
            self.storyContentDisposable?.dispose()
        }
        
        var mediaStreamCall: PresentationGroupCall? {
            if let view = self.liveChat?.view as? StoryItemSetContainerComponent.View {
                return view.mediaStreamCall
            }
            return nil
        }
                
        func update(component: CameraLiveStreamComponent, availableSize: CGSize, state: EmptyComponentState, environment: Environment<EnvironmentType>, transition: ComponentTransition) -> CGSize {
            self.component = component
            self.state = state
                        
            if let story = component.story {
                if self.storyContentDisposable == nil {
                    let storyContent = SingleStoryContentContextImpl(context: component.context, storyId: StoryId(peerId: component.peerId, id: story.id), storyItem: story, readGlobally: false)
                    self.storyContent = storyContent
                    self.storyContentDisposable = (storyContent.state
                    |> deliverOnMainQueue).start(next: { [weak self] state in
                        guard let self else {
                            return
                        }
                        self.storyContentState = state
                        self.state?.updated()
                    })
                }
                
                if let storyContentState = self.storyContentState, let slice = storyContentState.slice {
                    var mediaStreamTransition = transition
                    
                    let liveChat: ComponentView<Empty>
                    if let current = self.liveChat {
                        liveChat = current
                    } else {
                        mediaStreamTransition = .immediate
                        liveChat = ComponentView()
                        self.liveChat = liveChat
                    }
                    
                    let itemSetContainerInsets = UIEdgeInsets(top: component.statusBarHeight + 5.0, left: 0.0, bottom: 0.0, right: 0.0)
                    let itemSetContainerSafeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: 20.0, right: 0.0)
                             
                    let _ = liveChat.update(
                        transition: mediaStreamTransition,
                        component: AnyComponent(StoryItemSetContainerComponent(
                            context: component.context,
                            externalState: self.externalState,
                            storyItemSharedState: self.storyItemSharedState,
                            availableReactions: nil,
                            slice: slice,
                            theme: defaultDarkColorPresentationTheme,
                            strings: component.strings,
                            containerInsets: itemSetContainerInsets,
                            safeInsets: itemSetContainerSafeInsets,
                            statusBarHeight: component.statusBarHeight,
                            inputHeight: component.inputHeight,
                            metrics: component.metrics,
                            deviceMetrics: component.deviceMetrics,
                            isEmbeddedInCamera: true,
                            isProgressPaused: false,
                            isAudioMuted: false,
                            audioMode: .off,
                            hideUI: false,
                            visibilityFraction: 1.0,
                            isPanning: false,
                            pinchState: nil,
                            presentController: { c, a in
                                //                            guard let self, let environment = self.environment else {
                                //                                return
                                //                            }
                                //                            if c is UndoOverlayController || c is TooltipScreen {
                                //                                environment.controller()?.present(c, in: .current)
                                //                            } else {
                                //                                environment.controller()?.present(c, in: .window(.root), with: a)
                                //                            }
                            },
                            presentInGlobalOverlay: { c, a in
                                //                            guard let self, let environment = self.environment else {
                                //                                return
                                //                            }
                                //                            environment.controller()?.presentInGlobalOverlay(c, with: a)
                            },
                            close: {
                                //                            guard let self, let environment = self.environment else {
                                //                                return
                                //                            }
                                //                            environment.controller()?.dismiss()
                            },
                            navigate: { _ in
                            },
                            delete: {
                            },
                            markAsSeen: { _ in
                            },
                            reorder: {
                            },
                            createToFolder: { _, _ in
                            },
                            addToFolder: { _ in
                            },
                            controller: {
                                return nil //self?.environment?.controller()
                            },
                            toggleAmbientMode: {
                            },
                            keyboardInputData: self.inputMediaNodeDataPromise.get(),
                            closeFriends: self.closeFriendsPromise,
                            blockedPeers: self.blockedPeers,
                            sharedViewListsContext: StoryItemSetViewListComponent.SharedListsContext(),
                            stealthModeTimeout: nil,
                            isDismissed: false
                        )),
                        environment: {},
                        containerSize: availableSize
                    )
                    let liveChatFrame = CGRect(origin: CGPoint(), size: availableSize)
                    if let liveChatView = liveChat.view as? StoryItemSetContainerComponent.View {
                        if liveChatView.superview == nil {
                            liveChatView.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.25)
                            
                            liveChat.parentState = state
                            self.addSubview(liveChatView)
                        }
                        mediaStreamTransition.setFrame(view: liveChatView, frame: liveChatFrame)
                        
                        if let mediaStreamCall = liveChatView.mediaStreamCall {
                            component.didSetupMediaStream(mediaStreamCall)
                        }
                    }
                }
            } else {
                if let liveChat = self.liveChat {
                    self.liveChat = nil
                    liveChat.view?.removeFromSuperview()
                }
            }
            return availableSize
        }
    }

    public func makeView() -> View {
        return View(frame: CGRect())
    }
    
    public func update(view: View, availableSize: CGSize, state: State, environment: Environment<EnvironmentType>, transition: ComponentTransition) -> CGSize {
        return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
    }
}