//
//  ContentView.swift
//  gloss
//
//  Created by Saint on 10/23/22.
//

import GRDB
import GRDBQuery
import os
import SwiftUI
import SwiftUIIntrospect

let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "network")

var currentId: String?
var currentOffset: CGFloat?

var disableDrop = false

//TODO: move to globals file
let mainBackgroundColor = Color(red: 0.1, green: 0.1, blue: 0.1)
let mainTextColor = Color(UIColor(red: 0.76, green: 0.76, blue: 0.76, alpha: 1.00))
let secondBackgroundColor = Color(red: 0.18, green: 0.18, blue: 0.18)

public extension UserDefaults {
    func optionalInt(forKey defaultName: String) -> Int? {
        let defaults = self
        if let value = defaults.value(forKey: defaultName) {
            return value as? Int
        }
        return nil
    }

    func optionalBool(forKey defaultName: String) -> Bool? {
        let defaults = self
        if let value = defaults.value(forKey: defaultName) {
            return value as? Bool
        }
        return nil
    }
}

func createUndoState(selectedRibbon: Ribbon,
                     appDatabase   : AppDatabase,
                     paneConnector : PaneConnector) async throws -> [Ribbon]

{
    let updateThreshold = 30
    var updatedRibbon = selectedRibbon
    var scrollOffsetToSave = Int(floor(paneConnector.currentOffset))
    var scrollIdToSave = paneConnector.currentId

    var offsetDiff = abs(scrollOffsetToSave - updatedRibbon.scrollOffset) > 30

    var idDiff = Int(updatedRibbon.scrollId) != Int(scrollIdToSave)

    if idDiff || offsetDiff {
        updatedRibbon.scrollId = scrollIdToSave
        updatedRibbon.scrollOffset = scrollOffsetToSave

        print("meow bumping")
        let ret = try await appDatabase.bumpRibbon(&updatedRibbon)
        return ret
    }
    print("meow no bump")
    return []
}

func goToRibbon(selectedRibbon: Ribbon,
                destRibbon: Ribbon,
                appDatabase: AppDatabase,
                paneConnector: PaneConnector,
                loading: Bool)
{
    print("meow goto ribbon - selected ribbon: \(selectedRibbon), dest ribbon: \(destRibbon) ")

    DispatchQueue.main.asyncAfter(deadline: .now()) {
        Task {
            var scrollOffsetToSave = paneConnector.currentOffset
            var scrollIdToSave = paneConnector.currentId

            print("go to ribbon")
            print("\(selectedRibbon.id) \(destRibbon.id!)")

            // if selectedRibbon.id != destRibbon.id! || loading {
            if true {
                print("switching ribbons")

                paneConnector.showOverlay = true

                if loading {
                    paneConnector.currentId = destRibbon.scrollId
                }

                paneConnector.scrollId = destRibbon.scrollId
                paneConnector.scrollOffset = CGFloat(destRibbon.scrollOffset)
                paneConnector.refresh.toggle()

                print("toggling")
                print("paneconnector: \(paneConnector.refresh)")

                var updateSelectRibbon = SelectedRibbon(id: Int64(1), ribbonGroupId: Int64(destRibbon.groupId))
                // print("Saving selected ribbon")
                // print(updateSelectRibbon)
                do {
                    _ = try await appDatabase.saveSelectedRibbon(&updateSelectRibbon)
                } catch {
                    // Print("something wrong")
                }
            }

        }
    }

}

extension View {
    @ViewBuilder
    func `if`<Transform: View>(_ condition: Bool, transform: (Self) -> Transform) -> some View {
        if condition { transform(self) }
        else { self }
    }
}

struct RibbonCrown: View {
    var ribbon: Ribbon
    @ObservedObject var paneConnector: PaneConnector
    var draggedRibbon: Ribbon?
    var isDragging: Bool

    var height = CGFloat(41)
    var width = CGFloat(70)
    var scale = 0.70

    @Environment(\.appDatabase) private var appDatabase

    @Query(SelectedRibbonRequest()) private var selectedRibbon: [Ribbon]

    @State var saveOffset = CGFloat()
    @Binding var refresh: Bool

    var body: some View {
        ZStack {
            MyIcon().frame(
                width: CGFloat(100 * 1.66 * scale),
                height: CGFloat(100 * scale),
                alignment: .center
            ).foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
                .contentShape(.dragPreview, RoundedRectangle(cornerRadius: 32))
                .if(draggedRibbon != nil && draggedRibbon!.id == ribbon.id && isDragging) { $0.overlay(Color(red: 0.1, green: 0.1, blue: 0.1)) }

            Text(ribbon.title)
                .foregroundColor(Color(UIColor(red: 0.76, green: 0.76, blue: 0.76, alpha: 1.00)))
                .frame(minWidth: width,
                       maxWidth: width,
                       minHeight: height,
                       maxHeight: height,
                       alignment: .center)

                .if(draggedRibbon != nil && draggedRibbon!.id == ribbon.id && isDragging) { $0.overlay(Color(red: 0.1, green: 0.1, blue: 0.1)) }
                .background(Color(red: 0.1, green: 0.1, blue: 0.1))
                .multilineTextAlignment(.center)
                // .minimumScaleFactor(0.5)
                // .padding([.top, .bottom], 10)
                .font(Font.custom("AveriaSerifLibre-Regular", size: CGFloat(10)))
        }
        .onTapGesture {
            Task {
                let sr = selectedRibbon[0]
                let updatedRibbon = try await createUndoState(selectedRibbon: sr,
                                                              appDatabase: appDatabase,
                                                              paneConnector: paneConnector)

                if sr.id == ribbon.id {
                    paneConnector.scrollId = paneConnector.currentId
                    paneConnector.scrollOffset = paneConnector.currentOffset
                    paneConnector.hasMoved = false
                } else {
                    goToRibbon(selectedRibbon: sr,
                               destRibbon: ribbon,
                               appDatabase: appDatabase,
                               paneConnector: paneConnector,
                               loading: false)
                }
            }
        }
        .frame(width: CGFloat(100 * 1.66 * scale + 10), height: CGFloat(100 * scale + 5))
    }
}

// object used for JSON decoding of verses
class Verse: NSObject, Codable {
    var body: String
    var verse: Int
}

func makeVerseView(seg: SegDenorm) -> some View {
    var retView = Text("")
    var segSplit = seg.body.components(separatedBy: ";;")
    let decoder = JSONDecoder()
    for (index, item) in segSplit.enumerated() {
        let verse = try! decoder.decode(Verse.self, from: item.data(using: .utf8)!)

        retView = retView + Text(String(verse.verse))
            .font(Font.custom("AveriaSerifLibre-Regular", size: 6))
            .baselineOffset(6.0)
            .foregroundColor(Color.white)

        retView = retView + Text(verse.body)
            .foregroundColor(Color.white)
            .font(Font.custom("AveriaSerifLibre-Regular", size: 15))
    }
    return retView
}

class PaneConnector: NSObject, ObservableObject {

    var showOverlay: Bool = false
    @Published var refresh: Bool = false
    @Published var vertSep = CGFloat(20)
    var currentId = ""
    var currentOffset = CGFloat()
    var visibilityTracker: VisibilityTracker<String>?
    @Published var scrollId = ""
    @Published var scrollOffset = CGFloat()
    @Published var hasMoved = false
    var setScrollOffset: CGFloat?
    @Published var disableScroll = false


}

class ScrollDelegate: NSObject, ObservableObject, UIScrollViewDelegate {
    @Published var isScrolling = false

    func scrollViewWillBeginDragging(_: UIScrollView) {
        print("pop started scroll")
        isScrolling.toggle()
    }

    func scrollViewDidEndDragging(_: UIScrollView, willDecelerate _: Bool) {
        print("pop ended scroll")
        isScrolling.toggle()
    }
}



struct ContentView: View {
    // this is for the whole view swiping
    @State var mainSwipe = CGSize.zero
    @State var pulledOut = CGSize.zero

    @State var selection = 0

    @StateObject var paneConnector = PaneConnector()
    @StateObject var scrollDelegate = ScrollDelegate()

    @State var refresh: Bool = false

    @State var readOffset = CGPoint()

    @Query(SegDenormRequest(book: "bible.john")) private var segs: [SegDenorm]

    @State var draggedRibbon: Ribbon?
    @State var isDragging = false

    @State var dragOffset = CGFloat(0)

    @GestureState var dragGestureActive =  CGSize.zero

    enum SwipeStartState {
        case center
        case right
        case left
    }

    enum SwipeStartDir {
        case left
        case right
    }

    // @State var curSwipeState: SwipeState = .start
    @State var startSwipeState: SwipeStartState?
    @State var startSwipeDir: SwipeStartDir?

    @Environment(\.appDatabase) private var appDatabase

    @Query(RibbonRequest()) private var ribbons: [Ribbon]
    @Query<SelectedRibbonRequest> var selectedRibbon: [Ribbon]

    init() {
        UITableView.appearance().backgroundColor = UIColor(Color(red: 0.2, green: 0.2, blue: 0.2))
        _selectedRibbon = Query(SelectedRibbonRequest())

    }


    var body: some View {


        var fontSize = CGFloat(15)
        var scale = 0.65
        var height = CGFloat(50)

        var width = CGFloat(100 * 1.66 * scale)

        GeometryReader { geometry in
            ZStack(alignment: .top) {
                VStack(alignment: .leading) {
                    VStack {

                        ForEach(ribbons) { ribbon in
                            RibbonCrown(ribbon: ribbon,
                                        paneConnector: paneConnector,
                                        draggedRibbon: draggedRibbon,
                                        isDragging: isDragging,
                                        refresh: $refresh)
                                .onDrag {
                                    self.draggedRibbon = ribbon
                                    return NSItemProvider()
                                }
                                .onDrop(of: [.item],
                                        delegate: DropViewDelegate(destinationItem: ribbon,
                                                                   draggedItem: $draggedRibbon,
                                                                   isDragging: $isDragging,
                                                                   appDatabase: appDatabase))
                                .offset(x: 6, y: 6)
                        }
                    }
                    .frame(width: geometry.size.width, height: geometry.size.height - 100, alignment: .topLeading)
                    .background(Color(red: 0.1, green: 0.1, blue: 0.1))
                    .zIndex(0)
                    .animation(.default, value: ribbons)
                    .onDrop(of: [.item],
                            delegate: DropViewDelegate2(isDragging: $isDragging))
                }
                .background(Color(red: 0.1, green: 0.1, blue: 0.1))
                .frame(alignment: .topLeading)


                VStack {
                    NaviBar(paneConnector: paneConnector)
                    StatsPanel(paneConnector: paneConnector)
                    .offset(y:20)
                }
                // .frame(maxWidth: 300)
                .offset(x: geometry.size.width - 300)

                VStack {
                    // Top pane

                    Pane(paneConnector: paneConnector,
                         scrollDelegate: scrollDelegate,
                         selectedRibbon: selectedRibbon,
                         width: geometry.size.width - 15,
                         height: geometry.size.height + 20,
                         dragOffset: dragOffset)

                    ///////////////////////////////////

                    // Text("separator").foregroundColor(Color(UIColor(red: 0.76, green: 0.76, blue: 0.76, alpha: 1.00)))
                    //     .gesture(
                    //         DragGesture()
                    //             .onChanged { gesture in
                    //                 paneConnector.vertSep = paneConnector.vertSep - gesture.translation.height
                    //             }
                    //

                    // // Bottom pane
                    // ScrollViewReader { _ in
                    //     VisibilityTrackingScrollView(action: handleVisibilityChanged2) {
                    //         // ScrollView {

                    //         LazyVStack {
                    //             ForEach(segs) { seg in
                    //                 SegRow(seg: seg,
                    //                        ribbonId: selectedRibbon[0].id!)
                    //                     .id("\(seg.id)")
                    //                     .padding(EdgeInsets(top: 10, leading: 20, bottom: 40, trailing: 20))
                    //                     .trackVisibility(id: "\(seg.id)")
                    //             }
                    //         }
                    //         .background(Color(red: 0.18, green: 0.18, blue: 0.18))
                    //     }

                    //     .onAppear {
                    //         Print("APPEAR")
                    //     }
                    //     .listStyle(PlainListStyle())
                    // }
                    // .zIndex(1)
                    // .background(Color(red: 0.2, green: 0.2, blue: 0.2))

                    ///////////////////////////////////
                }
                .offset(x: 20, y: 0)
                .offset(x: pulledOut.width)
                .offset(x: mainSwipe.width)
                .highPriorityGesture(
                    DragGesture(minimumDistance: 20)
                        .updating($dragGestureActive) { value, state, _ in
                            print("pop here")
                            state = value.translation
                        }
                        .onChanged { value in
                            print("pop changed")
                            // Calculate the offset

                            let margin = CGFloat(30)

                            var newOffset = value.translation.width
                            if startSwipeState == nil {
                                if pulledOut.width == 0 {
                                    startSwipeState = .center
                                } else if pulledOut.width < 0 {
                                    startSwipeState = .left
                                } else {
                                    startSwipeState = .right
                                }

                                print("start swipe meow: \(startSwipeState)")
                            }

                            if newOffset > 0 {
                                startSwipeDir = .right
                            } else {
                                startSwipeDir = .left
                            }

                            // Apply resistance if out of bounds
                            let maxRight: CGFloat = 140
                            let finalRight: CGFloat = 110
                            let rightDiff = maxRight - finalRight
                            var maxOffsetLeft: CGFloat = -200

                            if newOffset > maxRight , pulledOut.width == 0 {
                                // newOffset = maxRight + rubberBandEffect(newOffset)
                                newOffset = maxRight + rubberBandEffect(newOffset - maxRight)
                            }

                            if newOffset > rightDiff, pulledOut.width > 0 {
                                newOffset = rightDiff + rubberBandEffect(newOffset - rightDiff)
                            }

                            if newOffset < maxOffsetLeft, pulledOut.width == 0 {
                                newOffset = maxOffsetLeft + rubberBandEffect(newOffset)
                            }

                            self.mainSwipe.width = newOffset

                            // dragOffset is what is used to make the text be readable
                            // with the right pane being visible

                            if mainSwipe.width < -margin, pulledOut.width <= 0 {
                                dragOffset = margin + mainSwipe.width + pulledOut.width
                            }

                            if mainSwipe.width > 0, pulledOut.width < 0 {
                                dragOffset = margin + mainSwipe.width + pulledOut.width
                            }
                        }
                        .onEnded { _ in
                            onDragEnded()
                        }
                )
                .onChange(of: scrollDelegate.isScrolling) { value in
                    print ("pop reset change")
                    // if scrollDelegate.isScrolling == true {
                        Task {
                        mainSwipe.width = 0
                        }
                    // }
                }
            }
        }
        .background(Color(red: 0.1, green: 0.1, blue: 0.1))
    }

    func onDragEnded() {
        print("pop ended")
        paneConnector.disableScroll = false
        var finalSwipe = CGFloat(0)
        let swipeLeftFinal = CGFloat(-200)
        let swipeRightFinal = CGFloat(110)

        let margin = CGFloat(30)
        var setDragOffset = CGFloat(0)

        if startSwipeState == .center {
            if startSwipeDir == .right {
                finalSwipe = swipeRightFinal
            } else {
                finalSwipe = swipeLeftFinal
                setDragOffset = margin + swipeLeftFinal
            }
        } else if startSwipeState == .right {
            finalSwipe = .zero

            if startSwipeDir == .left {
                finalSwipe = .zero
            } else {
                finalSwipe = swipeRightFinal
            }
        } else if startSwipeState == .left {
            if startSwipeDir == .left {
                finalSwipe = swipeLeftFinal
                setDragOffset = margin + swipeLeftFinal
            } else {
                finalSwipe = .zero
            }
        }

        startSwipeState = nil
        startSwipeDir = nil

        print("foo")

        // if mainSwipe.width < 0 && pulledOut.width > 0 {
        //     setPulledOutWith = CGFloat(0)
        // } else if mainSwipe.width > 0 && pulledOut.width < 0 {
        //     setPulledOutWith = CGFloat(0)

        // } else if (mainSwipe.width < 0 && pulledOut.width < 0) ||
        //     (mainSwipe.width < 0 && pulledOut.width == 0)  {
        //     setPulledOutWith = pulledOutRight
        //     setDragOffset = margin + setPulledOutWith
        // } else if abs(mainSwipe.width + pulledOut.width) > 30 {
        //     setPulledOutWith = pulledOutLeft
        // }

        withAnimation(.spring(response: 0.2)) {
            pulledOut.width = finalSwipe
            dragOffset = setDragOffset
            mainSwipe = .zero
        }
    }



   // let hackyPinch = MagnificationGesture(minimumScaleDelta: 0.0)
   //    .onChanged({ delta in
   //      onDragEnded()
   //    })
   //    .onEnded({ delta in
   //      onDragEnded()
   //    })

   //  let hackyRotation = RotationGesture(minimumAngleDelta: Angle(degrees: 0.0))
   //    .onChanged({ delta in
   //      onDragEnded()
   //    })
   //    .onEnded({ delta in
   //      onDragEnded()
   //    })

   //  let hackyPress = LongPressGesture(minimumDuration: 0.0, maximumDistance: 0.0)
   //    .onChanged({ _ in
   //      onDragEnded()
   //    })
   //    .onEnded({ delta in
   //      onDragEnded()
   //    })



    func handleVisibilityChanged2(_: String, change _: VisibilityChange, tracker _: VisibilityTracker<String>) {}


    func rubberBandEffect(_ offset: CGFloat) -> CGFloat {
        let resistance: CGFloat = 0.05
        return 6 * log(offset + 1)
        // return resistance * pow(abs(offset), 1) * (offset < 0 ? -1 : 1)
    }

    private func dragCancelled() {
        print("pop dragCancelled")
        mainSwipe = .zero
    }
}

private let itemFormatter: DateFormatter = {
    let formatter = DateFormatter()
    formatter.dateStyle = .short
    formatter.timeStyle = .medium
    return formatter
}()

struct DropViewDelegate2: DropDelegate {
    @Binding var isDragging: Bool

    func dropUpdated(info _: DropInfo) -> DropProposal? {
        return DropProposal(operation: .move)
    }

    func performDrop(info _: DropInfo) -> Bool {
        isDragging = false
        return true
    }

    func dropEntered(info _: DropInfo) {
        isDragging = true
        print("SECOND DROPPPOOO")
    }
}

struct DropViewDelegate: DropDelegate {
    let destinationItem: Ribbon
    // @Binding var colors: [Color]
    @Binding var draggedItem: Ribbon?
    @Binding var isDragging: Bool
    let appDatabase: AppDatabase

    func dropUpdated(info _: DropInfo) -> DropProposal? {
        return DropProposal(operation: .move)
    }

    func dropExited(info _: DropInfo) {
        print("EXITED")
        isDragging = false
    }

    func dropEntered(info _: DropInfo) {
        Task {
            isDragging = true
            if draggedItem == nil {
                return
            }

            if disableDrop {
                return
            }

            var newRibbon = draggedItem!
            var newDest = destinationItem

            var oldPos = draggedItem!.pos
            var newPos = destinationItem.pos

            print("dragged item")
            print(draggedItem)
            print("dest item")
            print(destinationItem)

            if draggedItem!.id! == destinationItem.id! {
                return
            }

            newRibbon.pos = destinationItem.pos

            _ = try await appDatabase.updateRibbonPosition(&newRibbon, oldPos, newPos)
            disableDrop = true
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                disableDrop = false
            }
            draggedItem!.pos = newPos

            // draggedItem = nil
        }
    }

    func performDrop(info _: DropInfo) -> Bool {
        print("PERFORMED DROPPPP")
        draggedItem = nil
        isDragging = false
        return true
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()

        ContentView().environment(\.appDatabase, .random())
    }
}

extension View {
    @discardableResult
    func Print(_ vars: Any...) -> some View {
        for v in vars {
            print(v)
        }
        return EmptyView()
    }
}