import Foundation
import UIKit
import AsyncDisplayKit
import Display
import Postbox
import TelegramCore
import SyncCore
import SwiftSignalKit
import TelegramPresentationData
import AccountContext
import SearchBarNode
import SearchUI
import ContactListUI
import ChatListUI
import SegmentedControlNode

final class PeerSelectionControllerNode: ASDisplayNode {
    private let context: AccountContext
    private let present: (ViewController, Any?) -> Void
    private let dismiss: () -> Void
    private let filter: ChatListNodePeersFilter
    
    var inProgress: Bool = false {
        didSet {
            
        }
    }
    
    var navigationBar: NavigationBar?
    
    private let toolbarBackgroundNode: ASDisplayNode?
    private let toolbarSeparatorNode: ASDisplayNode?
    private let segmentedControlNode: SegmentedControlNode?
    
    var contactListNode: ContactListNode?
    let chatListNode: ChatListNode
    
    private var contactListActive = false
    
    private var searchDisplayController: SearchDisplayController?
    
    private var containerLayout: (ContainerViewLayout, CGFloat, CGFloat)?
    
    var contentOffsetChanged: ((ListViewVisibleContentOffset) -> Void)?
    var contentScrollingEnded: ((ListView) -> Bool)?
    
    var requestActivateSearch: (() -> Void)?
    var requestDeactivateSearch: (() -> Void)?
    var requestOpenPeer: ((PeerId) -> Void)?
    var requestOpenDisabledPeer: ((Peer) -> Void)?
    var requestOpenPeerFromSearch: ((Peer) -> Void)?
    var requestOpenMessageFromSearch: ((Peer, MessageId) -> Void)?
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    private var readyValue = Promise<Bool>()
    var ready: Signal<Bool, NoError> {
        return self.readyValue.get()
    }
    
    init(context: AccountContext, filter: ChatListNodePeersFilter, hasContactSelector: Bool, present: @escaping (ViewController, Any?) -> Void, dismiss: @escaping () -> Void) {
        self.context = context
        self.present = present
        self.dismiss = dismiss
        self.filter = filter
        
        self.presentationData = context.sharedContext.currentPresentationData.with { $0 }
        
        if hasContactSelector {
            self.toolbarBackgroundNode = ASDisplayNode()
            self.toolbarBackgroundNode?.backgroundColor = self.presentationData.theme.rootController.navigationBar.backgroundColor
            
            self.toolbarSeparatorNode = ASDisplayNode()
            self.toolbarSeparatorNode?.backgroundColor = self.presentationData.theme.rootController.navigationBar.separatorColor
            
            let items = [
                self.presentationData.strings.DialogList_TabTitle,
                self.presentationData.strings.Contacts_TabTitle
            ]
            self.segmentedControlNode = SegmentedControlNode(theme: SegmentedControlTheme(theme: self.presentationData.theme), items: items.map { SegmentedControlItem(title: $0) }, selectedIndex: 0)
        } else {
            self.toolbarBackgroundNode = nil
            self.toolbarSeparatorNode = nil
            self.segmentedControlNode = nil
        }
       
        self.chatListNode = ChatListNode(context: context, groupId: .root, previewing: false, fillPreloadItems: false, mode: .peers(filter: filter, isSelecting: false, additionalCategories: [], chatListFilters: nil), theme: presentationData.theme, fontSize: presentationData.listsFontSize, strings: presentationData.strings, dateTimeFormat: presentationData.dateTimeFormat, nameSortOrder: presentationData.nameSortOrder, nameDisplayOrder: presentationData.nameDisplayOrder, disableAnimations: presentationData.disableAnimations)
        
        super.init()
        
        self.setViewBlock({
            return UITracingLayerView()
        })
        
        self.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        
        self.chatListNode.activateSearch = { [weak self] in
            self?.requestActivateSearch?()
        }
        
        self.chatListNode.peerSelected = { [weak self] peer, _, _ in
            self?.requestOpenPeer?(peer.id)
        }
        
        self.chatListNode.disabledPeerSelected = { [weak self] peer in
            self?.requestOpenDisabledPeer?(peer)
        }
        
        self.chatListNode.contentOffsetChanged = { [weak self] offset in
            self?.contentOffsetChanged?(offset)
        }
        
        self.chatListNode.contentScrollingEnded = { [weak self] listView in
            return self?.contentScrollingEnded?(listView) ?? false
        }
        
        self.addSubnode(self.chatListNode)
        self.presentationDataDisposable = (context.sharedContext.presentationData
        |> deliverOnMainQueue).start(next: { [weak self] presentationData in
            if let strongSelf = self {
                let previousTheme = strongSelf.presentationData.theme
                let previousStrings = strongSelf.presentationData.strings
                strongSelf.presentationData = presentationData
                if previousTheme !== presentationData.theme || previousStrings !== presentationData.strings {
                    strongSelf.updateThemeAndStrings()
                }
            }
        })
        
        if hasContactSelector {
            self.segmentedControlNode!.selectedIndexChanged = { [weak self] index in
                self?.indexChanged(index)
            }
            
            self.addSubnode(self.toolbarBackgroundNode!)
            self.addSubnode(self.toolbarSeparatorNode!)
            self.addSubnode(self.segmentedControlNode!)
        }
        
        
        self.readyValue.set(self.chatListNode.ready)
    }
    
    deinit {
        self.presentationDataDisposable?.dispose()
    }
    
    private func updateThemeAndStrings() {
        self.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        self.searchDisplayController?.updatePresentationData(self.presentationData)
        self.chatListNode.updateThemeAndStrings(theme: self.presentationData.theme, fontSize: self.presentationData.listsFontSize, strings: self.presentationData.strings, dateTimeFormat: self.presentationData.dateTimeFormat, nameSortOrder: self.presentationData.nameSortOrder, nameDisplayOrder: self.presentationData.nameDisplayOrder, disableAnimations: self.presentationData.disableAnimations)
        
        self.toolbarBackgroundNode?.backgroundColor = self.presentationData.theme.rootController.navigationBar.backgroundColor
        self.toolbarSeparatorNode?.backgroundColor = self.presentationData.theme.rootController.navigationBar.separatorColor
        self.segmentedControlNode?.updateTheme(SegmentedControlTheme(theme: self.presentationData.theme))
    }
    
    func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, actualNavigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        self.containerLayout = (layout, navigationBarHeight, actualNavigationBarHeight)
        
        let cleanInsets = layout.insets(options: [])
        
        var toolbarHeight: CGFloat = cleanInsets.bottom

        if let segmentedControlNode = self.segmentedControlNode, let toolbarBackgroundNode = self.toolbarBackgroundNode, let toolbarSeparatorNode = self.toolbarSeparatorNode {
            toolbarHeight += 44.0
            transition.updateFrame(node: toolbarBackgroundNode, frame: CGRect(origin: CGPoint(x: 0.0, y: layout.size.height - toolbarHeight), size: CGSize(width: layout.size.width, height: toolbarHeight)))
            transition.updateFrame(node: toolbarSeparatorNode, frame: CGRect(origin: CGPoint(x: 0.0, y: layout.size.height - toolbarHeight), size: CGSize(width: layout.size.width, height: UIScreenPixel)))
            
            let controlSize = segmentedControlNode.updateLayout(.sizeToFit(maximumWidth: layout.size.width, minimumWidth: 200.0), transition: transition)
            transition.updateFrame(node: segmentedControlNode, frame: CGRect(origin: CGPoint(x: floor((layout.size.width - controlSize.width) / 2.0), y: layout.size.height - toolbarHeight + floor((44.0 - controlSize.height) / 2.0)), size: controlSize))
        }
        
        var insets = layout.insets(options: [.input])
        insets.top += navigationBarHeight
        insets.bottom = max(insets.bottom, cleanInsets.bottom + 44.0)
        insets.left += layout.safeInsets.left
        insets.right += layout.safeInsets.right
        
        var headerInsets = layout.insets(options: [.input])
        headerInsets.top += actualNavigationBarHeight
        headerInsets.bottom = max(headerInsets.bottom, cleanInsets.bottom)
        headerInsets.left += layout.safeInsets.left
        headerInsets.right += layout.safeInsets.right
        
        self.chatListNode.bounds = CGRect(x: 0.0, y: 0.0, width: layout.size.width, height: layout.size.height)
        self.chatListNode.position = CGPoint(x: layout.size.width / 2.0, y: layout.size.height / 2.0)
        
        let (duration, curve) = listViewAnimationDurationAndCurve(transition: transition)
        let updateSizeAndInsets = ListViewUpdateSizeAndInsets(size: layout.size, insets: insets, headerInsets: headerInsets, duration: duration, curve: curve)
        
        self.chatListNode.updateLayout(transition: transition, updateSizeAndInsets: updateSizeAndInsets)
        
        if let contactListNode = self.contactListNode {
            contactListNode.bounds = CGRect(x: 0.0, y: 0.0, width: layout.size.width, height: layout.size.height)
            contactListNode.position = CGPoint(x: layout.size.width / 2.0, y: layout.size.height / 2.0)
            
            let contactsInsets = insets
            
            contactListNode.containerLayoutUpdated(ContainerViewLayout(size: layout.size, metrics: layout.metrics, deviceMetrics: layout.deviceMetrics, intrinsicInsets: contactsInsets, safeInsets: layout.safeInsets, statusBarHeight: layout.statusBarHeight, inputHeight: layout.inputHeight, inputHeightIsInteractivellyChanging: layout.inputHeightIsInteractivellyChanging, inVoiceOver: layout.inVoiceOver), headerInsets: headerInsets, transition: transition)
        }
        
        if let searchDisplayController = self.searchDisplayController {
            searchDisplayController.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
        }
    }
    
    func activateSearch(placeholderNode: SearchBarPlaceholderNode) {
        guard let (containerLayout, navigationBarHeight, _) = self.containerLayout, let navigationBar = self.navigationBar else {
            return
        }
        
        if self.chatListNode.supernode != nil {
            self.searchDisplayController = SearchDisplayController(presentationData: self.presentationData, contentNode: ChatListSearchContainerNode(context: self.context, filter: self.filter, groupId: .root, openPeer: { [weak self] peer, _ in
                if let requestOpenPeerFromSearch = self?.requestOpenPeerFromSearch {
                    requestOpenPeerFromSearch(peer)
                }
            }, openDisabledPeer: { [weak self] peer in
                self?.requestOpenDisabledPeer?(peer)
            }, openRecentPeerOptions: { _ in
            }, openMessage: { [weak self] peer, messageId, _ in
                if let requestOpenMessageFromSearch = self?.requestOpenMessageFromSearch {
                    requestOpenMessageFromSearch(peer, messageId)
                }
            }, addContact: nil, peerContextAction: nil, present: { _, _ in
            }, presentInGlobalOverlay: { _, _ in
            }, navigationController: nil), cancel: { [weak self] in
                if let requestDeactivateSearch = self?.requestDeactivateSearch {
                    requestDeactivateSearch()
                }
            })
            
            self.searchDisplayController?.containerLayoutUpdated(containerLayout, navigationBarHeight: navigationBarHeight, transition: .immediate)
            self.searchDisplayController?.activate(insertSubnode: { [weak self, weak placeholderNode] subnode, isSearchBar in
                if let strongSelf = self, let strongPlaceholderNode = placeholderNode {
                    if isSearchBar {
                        strongPlaceholderNode.supernode?.insertSubnode(subnode, aboveSubnode: strongPlaceholderNode)
                    } else {
                        strongSelf.insertSubnode(subnode, belowSubnode: navigationBar)
                    }
                }
            }, placeholder: placeholderNode)
            
        } else if let contactListNode = self.contactListNode, contactListNode.supernode != nil {
            self.searchDisplayController = SearchDisplayController(presentationData: self.presentationData, contentNode: ContactsSearchContainerNode(context: self.context, onlyWriteable: true, categories: [.cloudContacts, .global], openPeer: { [weak self] peer in
                if let strongSelf = self {
                    switch peer {
                        case let .peer(peer, _, _):
                            let _ = (strongSelf.context.account.postbox.transaction { transaction -> Peer? in
                                return transaction.getPeer(peer.id)
                            } |> deliverOnMainQueue).start(next: { peer in
                                if let strongSelf = self, let peer = peer {
                                    strongSelf.requestOpenPeerFromSearch?(peer)
                                }
                            })
                        case .deviceContact:
                            break
                    }
                }
            }, contextAction: nil), cancel: { [weak self] in
                if let requestDeactivateSearch = self?.requestDeactivateSearch {
                    requestDeactivateSearch()
                }
            })
            
            self.searchDisplayController?.containerLayoutUpdated(containerLayout, navigationBarHeight: navigationBarHeight, transition: .immediate)
            self.searchDisplayController?.activate(insertSubnode: { [weak self, weak placeholderNode] subnode, isSearchBar in
                if let strongSelf = self, let strongPlaceholderNode = placeholderNode {
                    if isSearchBar {
                        strongPlaceholderNode.supernode?.insertSubnode(subnode, aboveSubnode: strongPlaceholderNode)
                    } else {
                        strongSelf.insertSubnode(subnode, belowSubnode: navigationBar)
                    }
                }
            }, placeholder: placeholderNode)
        }
    }
    
    func deactivateSearch(placeholderNode: SearchBarPlaceholderNode) {
        if let searchDisplayController = self.searchDisplayController {
            if self.chatListNode.supernode != nil {
                searchDisplayController.deactivate(placeholder: placeholderNode)
                self.searchDisplayController = nil
            } else if let contactListNode = self.contactListNode, contactListNode.supernode != nil {
                searchDisplayController.deactivate(placeholder: placeholderNode)
                self.searchDisplayController = nil
            }
        }
    }
    
    func scrollToTop() {
        if self.chatListNode.supernode != nil {
            self.chatListNode.scrollToPosition(.top)
        } else if let contactListNode = self.contactListNode, contactListNode.supernode != nil {
            contactListNode.scrollToTop()
        }
    }
    
    private func indexChanged(_ index: Int) {
        guard let (layout, navigationHeight, actualNavigationHeight) = self.containerLayout else {
            return
        }
            
        let contactListActive = index == 1
        if contactListActive != self.contactListActive {
            self.contactListActive = contactListActive
            if contactListActive {
                if let contactListNode = self.contactListNode {
                    self.insertSubnode(contactListNode, aboveSubnode: self.chatListNode)
                    self.chatListNode.removeFromSupernode()
                    self.recursivelyEnsureDisplaySynchronously(true)
                    contactListNode.enableUpdates = true
                } else {
                    let contactListNode = ContactListNode(context: context, presentation: .single(.natural(options: [], includeChatList: false)))
                    self.contactListNode = contactListNode
                    contactListNode.enableUpdates = true
                    contactListNode.activateSearch = { [weak self] in
                        self?.requestActivateSearch?()
                    }
                    contactListNode.openPeer = { [weak self] peer, _ in
                        if case let .peer(peer, _, _) = peer {
                            self?.requestOpenPeer?(peer.id)
                        }
                    }
                    contactListNode.suppressPermissionWarning = { [weak self] in
                        if let strongSelf = self {
                            strongSelf.context.sharedContext.presentContactsWarningSuppression(context: strongSelf.context, present: { c, a in
                                strongSelf.present(c, a)
                            })
                        }
                    }
                    contactListNode.contentOffsetChanged = { [weak self] offset in
                        self?.contentOffsetChanged?(offset)
                    }
                    
                    contactListNode.contentScrollingEnded = { [weak self] listView in
                        return self?.contentScrollingEnded?(listView) ?? false
                    }
                    self.containerLayoutUpdated(layout, navigationBarHeight: navigationHeight, actualNavigationBarHeight: actualNavigationHeight, transition: .immediate)
                    
                    let _ = (contactListNode.ready |> deliverOnMainQueue).start(next: { [weak self] _ in
                        if let strongSelf = self {
                            if let contactListNode = strongSelf.contactListNode {
                                strongSelf.insertSubnode(contactListNode, aboveSubnode: strongSelf.chatListNode)
                            }
                            strongSelf.chatListNode.removeFromSupernode()
                            strongSelf.recursivelyEnsureDisplaySynchronously(true)
                        }
                    })
                }
            } else if let contactListNode = self.contactListNode {
                contactListNode.enableUpdates = false
                
                self.insertSubnode(chatListNode, aboveSubnode: contactListNode)
                contactListNode.removeFromSupernode()
            }
        }
    }
}