//
//  SharingView.swift
//  Reflect (iOS)
//
//  Created by Trey Tartt on 2/6/22.
//

import SwiftUI

struct WrappedSharable: Hashable, Equatable {
    static func == (lhs: WrappedSharable, rhs: WrappedSharable) -> Bool {
        lhs.id == rhs.id && lhs.description == rhs.description
    }
    
    func hash(into hasher: inout Hasher) {
        hasher.combine(id)
    }
    
    let id = UUID()
    let preview: AnyView
    let destination: AnyView
    let description: String
}

struct SharingListView: View {
    @AppStorage(UserDefaultsStore.Keys.theme.rawValue, store: GroupUserDefaults.groupDefaults) private var theme: Theme = .system

    private var textColor: Color { theme.currentTheme.labelColor }

    class ShareStateViewModel: ObservableObject {
        @Published var selectedItem: WrappedSharable? = nil
        @Published var showSheet = false
    }

    @StateObject private var selectedShare = ShareStateViewModel()
    var sharebleItems =  [WrappedSharable]()
    
    @MainActor
    init() {
        let earliestDate = DataController.shared.earliestEntry?.forDate ?? Date()
        let now = Date()
        let tenDaysAgo = Calendar.current.date(byAdding: .day, value: -10, to: now)!
        let monthStart = now.startOfMonth
        let monthEnd = now.endOfMonth

        // — All Moods —
        let allMoodsEntries = DataController.shared.getData(startDate: earliestDate, endDate: now, includedDays: [1,2,3,4,5,6,7])
        let allMoodsMetrics = Random.createTotalPerc(fromEntries: allMoodsEntries)
        let allMoodsCount = allMoodsEntries.count

        // — Current Streak (Last 10 Days) —
        let streakEntries = DataController.shared.getData(startDate: tenDaysAgo, endDate: now, includedDays: [1,2,3,4,5,6,7])

        // — Month Total —
        let monthEntries = DataController.shared.getData(startDate: monthStart, endDate: monthEnd, includedDays: [1,2,3,4,5,6,7])
        let monthMetrics = Random.createTotalPerc(fromEntries: monthEntries)
        let month = Calendar.current.component(.month, from: now)

        self.sharebleItems = [
            // All Time Moods — style picker with 2 variations
            WrappedSharable(
                preview: AnyView(
                    AllMoodsTotalTemplate(isPreview: true, startDate: earliestDate, endDate: now, fakeData: false)
                ),
                destination: AnyView(
                    SharingStylePickerView(title: "All Time Moods", designs: [
                        SharingDesign(
                            name: "Gradient",
                            shareView: AnyView(AllMoodsV2(metrics: allMoodsMetrics, totalCount: allMoodsCount)),
                            image: { AllMoodsV2(metrics: allMoodsMetrics, totalCount: allMoodsCount).image }
                        ),
                        SharingDesign(
                            name: "Color Block",
                            shareView: AnyView(AllMoodsV5(metrics: allMoodsMetrics, totalCount: allMoodsCount)),
                            image: { AllMoodsV5(metrics: allMoodsMetrics, totalCount: allMoodsCount).image }
                        ),
                    ])
                ),
                description: AllMoodsTotalTemplate.description
            ),
            //////////////////////////////////////////////////////////
            // Last 10 Days — style picker with 2 variations
            WrappedSharable(
                preview: AnyView(
                    CurrentStreakTemplate(isPreview: true, startDate: tenDaysAgo, endDate: now, fakeData: false)
                ),
                destination: AnyView(
                    SharingStylePickerView(title: "Last 10 Days", designs: [
                        SharingDesign(
                            name: "Gradient Cards",
                            shareView: AnyView(CurrentStreakV2(moodEntries: streakEntries)),
                            image: { CurrentStreakV2(moodEntries: streakEntries).image }
                        ),
                        SharingDesign(
                            name: "Color Strips",
                            shareView: AnyView(CurrentStreakV5(moodEntries: streakEntries)),
                            image: { CurrentStreakV5(moodEntries: streakEntries).image }
                        ),
                    ])
                ),
                description: CurrentStreakTemplate.description
            ),
            //////////////////////////////////////////////////////////
            // Longest Streak — custom picker with mood selection
            WrappedSharable(
                preview: AnyView(
                    LongestStreakTemplate(isPreview: true, startDate: earliestDate, endDate: now, fakeData: false)
                ),
                destination: AnyView(
                    LongestStreakPickerView(startDate: earliestDate, endDate: now)
                ),
                description: LongestStreakTemplate.description
            ),
            //////////////////////////////////////////////////////////
            // This Month — style picker with 2 variations
            WrappedSharable(
                preview: AnyView(
                    MonthTotalTemplate(isPreview: true, startDate: monthStart, endDate: monthEnd, fakeData: false)
                ),
                destination: AnyView(
                    SharingStylePickerView(title: "This Month", designs: [
                        SharingDesign(
                            name: "Clean Calendar",
                            shareView: AnyView(MonthTotalV1(moodMetrics: monthMetrics, moodEntries: monthEntries, month: month)),
                            image: { MonthTotalV1(moodMetrics: monthMetrics, moodEntries: monthEntries, month: month).image }
                        ),
                        SharingDesign(
                            name: "Stacked Bars",
                            shareView: AnyView(MonthTotalV5(moodMetrics: monthMetrics, moodEntries: monthEntries, month: month)),
                            image: { MonthTotalV5(moodMetrics: monthMetrics, moodEntries: monthEntries, month: month).image }
                        ),
                    ])
                ),
                description: MonthTotalTemplate.description
            ),
            //////////////////////////////////////////////////////////
        ]
    }
    
   
    
    func didDismiss() {
        selectedShare.showSheet = false
        selectedShare.selectedItem = nil
    }
    
    var body: some View {
        VStack {
            ScrollView {
                ForEach(sharebleItems, id: \.self) { item in
                    Button(action: {
                        selectedShare.selectedItem = item
                        selectedShare.showSheet = true
                    }, label: {
                        ZStack {
                            theme.currentTheme.secondaryBGColor

                            item.preview
                                .frame(height: 88)

                            VStack {
                                Spacer()
                                Text(item.description)
                                    .font(.title)
                                    .foregroundColor(textColor)
                                    .fontWeight(.bold)
                                    .frame(minWidth: 0, maxWidth: .infinity)
                                    .frame(height: 44)
                                    .background(
                                        theme.currentTheme.secondaryBGColor
                                    )
                                    .opacity(0.9)
                            }
                        }
                        .frame(height: 88)
                        .cornerRadius(Constants.viewsCornerRaidus, corners: [.topLeft, .topRight, .bottomLeft, .bottomRight])
                        .scaledToFill()
                        .clipped()
                        .contentShape(Rectangle())
                        .padding([.leading, .trailing])
                    })
                    .accessibilityIdentifier(AccessibilityID.Sharing.templateButton(item.description))
                }
                
            }
        }
        .padding([.top, .bottom])
        .background(
            theme.currentTheme.bg
                .edgesIgnoringSafeArea(.top)
        )
        .sheet(isPresented: $selectedShare.showSheet,
               onDismiss: didDismiss) {
            selectedShare.selectedItem?.destination
        }
    }
    
    func share(image: UIImage) {
        
    }
}

struct SharingView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            SharingListView()
            
            SharingListView()
                .preferredColorScheme(.dark)
        }
    }
}