//
//  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 gTracker: VisibilityTracker<String>?
var printCount: Int64 = 0

var disableDrop = false

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 goToRibbon(selectedRibbon: Ribbon,
                destRibbon: Ribbon,
                scrollId: Binding<String?>,
                scrollOffset: Binding<CGFloat?>,
                refresh: Binding<Bool>,
                showOverlay: Binding<Bool>,
                appDatabase: AppDatabase,
                loading: Bool)
{
    Task {
        // print("SELECTED RIBBON", selectedRibbon)
        var scrollOffsetToSave = currentOffset
        var scrollIdToSave = currentId

        var updatedRibbon = selectedRibbon

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

            // withAnimation(.spring(response: 0.05)) {
            // showOverlay.wrappedValue = true
            showOverlay.wrappedValue = true
            // }

            if loading {
                currentId = destRibbon.scrollId
                // currentOffset = CGFloat(destRibbon.scrollOffset)
            }

            scrollId.wrappedValue = destRibbon.scrollId
            // print("setting scroll offset")
            scrollOffset.wrappedValue = CGFloat(destRibbon.scrollOffset)
            // print(scrollOffset.wrappedValue)
            // print("end setting scroll offset")
            refresh.wrappedValue.toggle()

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

        if !loading {
            print("not loading")
            updatedRibbon.scrollOffset = Int(floor(scrollOffsetToSave!))
            updatedRibbon.scrollId = scrollIdToSave!

            _ = try await appDatabase.saveRibbon(&updatedRibbon)
            // print("saved updatedRibbon", updatedRibbon)

            // print("UPDATED")
            // scrollOffsetToSave = userDefaults.object(forKey: "currentOffset") as? CGFloat
            // scrollIdToSave = userDefaults.object(forKey: "currentId") as? String
        } else {
            print("loading")
        }

        // print("scrollOffsetToSave: ", scrollOffsetToSave)
        // print("scrollIdToSave: ", scrollIdToSave)
    }
}

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
    @Binding var scrollId: String?
    @Binding var scrollOffset: CGFloat?
    @Binding var showOverlay: Bool
    @Binding var refresh: Bool
    var draggedRibbon: Ribbon?
    var isDragging: Bool

    var height = CGFloat(45)
    var scale = 0.65

    @Environment(\.appDatabase) private var appDatabase

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

    @State var saveOffset = CGFloat()
    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: CGFloat(70),
                       maxWidth: CGFloat(70),
                       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 {
                goToRibbon(selectedRibbon: sr[0],
                           destRibbon: ribbon,
                           scrollId: $scrollId,
                           scrollOffset: $scrollOffset,
                           refresh: $refresh,
                           showOverlay: $showOverlay,
                           appDatabase: appDatabase,
                           loading: false)
                   }
        }
        .frame(width: CGFloat(100 * 1.66 * scale + 10), height: CGFloat(100 * scale + 5))
    }
}

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
}

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

    // scroll location of the main fenestra
    @State var scrollId: String?
    @State var scrollOffset: CGFloat?

    @State var setScrollOffset: CGFloat?
    @State var showOverlay: Bool = false

    @State var vertSep = CGFloat(20)

    @Environment(\.appDatabase) private var appDatabase
    @Query(SegDenormRequest(book: "bible.mark")) private var segs: [SegDenorm]

    @State var endedDrag = true

    @State var readOffset = CGPoint()
    @State var dragOffset = CGFloat()

    @State var refresh: Bool = false
    @State var refresh2: Bool = false

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

    @State var reorder = true

    @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,
                                        scrollId: $scrollId,
                                        scrollOffset: $scrollOffset,
                                        showOverlay: $showOverlay,
                                        refresh: $refresh,
                                        draggedRibbon: draggedRibbon,
                                        isDragging: isDragging)
                                .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 {
                    ScrollViewReader { proxy in
                        VisibilityTrackingScrollView(action: handleVisibilityChanged) {
                            // ScrollView {

                            LazyVStack {
                                ForEach(segs) { seg in
                                    SegRow(seg: seg,
                                           ribbonId: selectedRibbon[0].id!)
                                        .id("\(seg.id)")
                                        .offset(x: -dragOffset)
                                        // .offset(x: pulledOut.width)

                                        .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")
                            // Print(selectedRibbon[0])
                            // scrollId = "3"
                            // scrollOffset = 103
                            // refresh.toggle()

                            goToRibbon(selectedRibbon: selectedRibbon[0],
                                       destRibbon: selectedRibbon[0],
                                       scrollId: $scrollId,
                                       scrollOffset: $scrollOffset,
                                       refresh: $refresh,
                                       showOverlay: $showOverlay,
                                       appDatabase: appDatabase,
                                       loading: true)
                        }
                        .onChange(of: refresh) { _ in
                            // if let target = target {
                            // gTracker!.visibleViews["123123"] = CGFloat(100)
                            // Print("ON CHANGE", gTracker!.visibleViews)
                            // Print("removing", gTracker!.visibleViews.removeAll())

                            Task {
                                DispatchQueue.main.async {
                                    Print("scroll Id target: \(scrollId)")
                                    proxy.scrollTo(scrollId!, anchor: .top)
                                    // proxy.scrollTo(String(Int(scrollId!)! + 1))
                                    // currentId = scrollId!
                                    // if (currentId != scrollId!) {

                                    DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                                        Print(" scroll id target", scrollId)
                                        Print(" current id ", currentId)
                                        Print(gTracker!.sortedViewIDs)
                                        if currentId! != scrollId! {
                                            Print("NO MATCH")
                                        }

                                        // Print(" scroll offset target", scrollOffset)
                                        Print(" current offset ", gTracker!.visibleViews[scrollId!])
                                        var curOffset = gTracker!.visibleViews[scrollId!]
                                        Print(" stats", gTracker!.visibleViews)
                                        // // setScrollOffset = CGFloat(Int(currentOffset!) * -1 + Int(scrollOffset!))
                                        if curOffset != nil {
                                            setScrollOffset = CGFloat(Int(scrollOffset!) - Int(curOffset!))
                                            Print("applying scroll offset \(setScrollOffset)")
                                            // // setScrollOffset = CGFloat(Int(scrollOffset!))
                                            // Print("setting scroll offset", setScrollOffset)
                                            refresh2.toggle()
                                        } else {
                                            var adjust = (Int(scrollId!)! - Int(currentId!)!) * 200
                                            Print("adjusting \(adjust)")

                                            setScrollOffset = CGFloat(adjust)
                                            refresh.toggle()
                                        }
                                        // // currentId = scrollId!

                                        // DispatchQueue.main.async {

                                        //     currentOffset = scrollOffset!
                                        //     currentId = scrollId!
                                        // }
                                    }
                                }
                            }
                        }
                        .introspect(.scrollView, on: .iOS(.v13, .v14, .v15, .v16, .v17)) { scrollView in Print("introspect")
                            if setScrollOffset != nil {
                                DispatchQueue.main.async {
                                    scrollView.contentOffset.y = scrollView.contentOffset.y + setScrollOffset!
                                    setScrollOffset = nil

                                    // self.showOverlay = false
                                    withAnimation {
                                        showOverlay = false
                                    }
                                }
                            }

                            Print("end introspect")
                        }
                        .listStyle(PlainListStyle())
                    }
                    .zIndex(1)
                    .background(Color(red: 0.2, green: 0.2, blue: 0.2))
                    .frame(width: geometry.size.width - 50, height: geometry.size.height / 2 - vertSep)

                    Text("separator").foregroundColor(Color(UIColor(red: 0.76, green: 0.76, blue: 0.76, alpha: 1.00)))
                        .gesture(
                            DragGesture()
                                .onChanged { gesture in

                                    vertSep = vertSep - gesture.translation.height
                                    Print(gesture.translation.width)
                                    Print(gesture.translation.height)

                                    Print("drag")
                                }
                        )

                    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)")

                                    // .onChange(of: geometry.frame(in: .named("scrollView"))) { imageRect in
                                    // Print(imageRect)
                                    // Print(outerProxy)
                                    // if isInView(innerRect: imageRect, isIn: outerProxy) {
                                    //     visibleIndex.insert(item)
                                    // } else {
                                    //     visibleIndex.remove(item)
                                    // }
                                    // }
                                }
                            }
                            .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))
                    .frame(width: geometry.size.width - 50)
                }
                .offset(x: 30, y: 0)
                .offset(x: pulledOut.width)
                .offset(x: viewState.width, y: viewState.height)
                .gesture(
                    DragGesture()
                        .onChanged { gesture in

                            if endedDrag {
                                endedDrag = false
                                scrollOffset = readOffset.y - 20
                            }
                            Print(viewState.width)
                            if abs(gesture.translation.width) > 20 {
                                viewState.width = gesture.translation.width
                                if gesture.translation.width < -50, pulledOut.width == CGFloat(0) {
                                    dragOffset = gesture.translation.width + 50
                                }
                            }
                        }
                        .onEnded { _ in
                            endedDrag = true
                            var pulledOutWidth = CGFloat(0)
                            if viewState.width < 0 {
                                pulledOutWidth = CGFloat(0)
                            } else if abs(viewState.width + pulledOut.width) > 30 {
                                pulledOutWidth = CGFloat(200)
                            }

                            withAnimation(.spring(response: 0.2)) {
                                pulledOut.width = pulledOutWidth
                                viewState = .zero
                                dragOffset = .zero
                            }
                        }
                    )


                if showOverlay {
                    Rectangle()
                        .frame(width: geometry.size.width - 50, height: geometry.size.height + 200)
                        .background(.ultraThinMaterial)

                        // .blur(radius: 0.8)
                        .offset(x: 30, y: -100)
                        .opacity(0.98)
                        .transition(.opacity)

                        // .frame(width: geometry.size.width - 50)
                        .offset(x: pulledOut.width)
                        .offset(x: viewState.width, y: viewState.height)
                        .zIndex(2)
                }
            }
        }
    }

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

    func handleVisibilityChanged(_: String, change _: VisibilityChange, tracker: VisibilityTracker<String>) {
        // var printRate: Int64 = 10
        gTracker = tracker

        let visibleViews2 = Array(tracker.visibleViews.keys)
        if visibleViews2.count == 0 {
            return
        }

        // currentId = tracker.sortedViewIDs[tracker.sortedViewIDs.count - 1]
        currentId = tracker.sortedViewIDs[0]
        currentOffset = tracker.visibleViews[currentId!]!
    }
}

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