import CoreData
import SwiftUI
import Swinject

extension OverrideProfilesConfig {
    struct RootView: BaseView {
        let resolver: Resolver

        @StateObject var state = StateModel()

        @State private var isEditing = false
        @State private var showAlert = false
        @State private var showingDetail = false
        @State private var alertSring = ""
        @State var isSheetPresented: Bool = false
        // temp targets
        @State private var isPromptPresented = false
        @State private var isRemoveAlertPresented = false
        @State private var removeAlert: Alert?
        @State private var isEditingTT = false

        @Environment(\.dismiss) var dismiss
        @Environment(\.managedObjectContext) var moc
        @Environment(\.colorScheme) var colorScheme
        var color: LinearGradient {
            colorScheme == .dark ? LinearGradient(
                gradient: Gradient(colors: [
                    Color.bgDarkBlue,
                    Color.bgDarkerDarkBlue
                ]),
                startPoint: .top,
                endPoint: .bottom
            )
                :
                LinearGradient(
                    gradient: Gradient(colors: [Color.gray.opacity(0.1)]),
                    startPoint: .top,
                    endPoint: .bottom
                )
        }

        @FetchRequest(
            entity: OverridePresets.entity(),
            sortDescriptors: [NSSortDescriptor(key: "name", ascending: true)], predicate: NSPredicate(
                format: "name != %@", "" as String
            )
        ) var fetchedProfiles: FetchedResults<OverridePresets>

        @FetchRequest(
            entity: TempTargetsSlider.entity(),
            sortDescriptors: [NSSortDescriptor(key: "date", ascending: false)]
        ) var isEnabledArray: FetchedResults<TempTargetsSlider>

        private var formatter: NumberFormatter {
            let formatter = NumberFormatter()
            formatter.numberStyle = .decimal
            formatter.maximumFractionDigits = 0
            return formatter
        }

        private var glucoseFormatter: NumberFormatter {
            let formatter = NumberFormatter()
            formatter.numberStyle = .decimal
            formatter.maximumFractionDigits = 0
            if state.units == .mmolL {
                formatter.maximumFractionDigits = 1
            }
            formatter.roundingMode = .halfUp
            return formatter
        }

        var presetPopover: some View {
            Form {
                Section {
                    TextField("Name Of Profile", text: $state.profileName)
                } header: { Text("Enter Name of Profile") }

                Section {
                    Button("Save") {
                        state.savePreset()
                        isSheetPresented = false
                    }
                    .disabled(state.profileName.isEmpty || fetchedProfiles.filter({ $0.name == state.profileName }).isNotEmpty)

                    Button("Cancel") {
                        isSheetPresented = false
                    }
                }
            }
        }

        var body: some View {
            VStack {
                Picker("Tab", selection: $state.selectedTab) {
                    ForEach(Tab.allCases) { tab in
                        Text(NSLocalizedString(tab.name, comment: "")).tag(tab)
                    }
                }
                .pickerStyle(.segmented).padding(.horizontal, 10)

                Form {
                    switch state.selectedTab {
                    case .profiles: profiles()
                    case .tempTargets: tempTargets() }
                }.scrollContentBackground(.hidden).background(color)
                    .onAppear(perform: configureView)
                    .onAppear { state.savedSettings() }
                    .navigationBarTitle("Profiles")
                    .navigationBarTitleDisplayMode(.large)
            }.background(color)
        }

        @ViewBuilder func profiles() -> some View {
            if state.presetsProfiles.isNotEmpty {
                Section {
                    ForEach(fetchedProfiles) { preset in
                        profilesView(for: preset)
                    }.onDelete(perform: removeProfile)
                }.listRowBackground(Color.chart)
            }
            Section {
                VStack {
                    Spacer()
                    Text("\(state.percentageProfiles.formatted(.number)) %")
                        .foregroundColor(
                            state
                                .percentageProfiles >= 130 ? .red :
                                (isEditing ? .orange : Color.blue)
                        )
                        .font(.largeTitle)
                    Slider(
                        value: $state.percentageProfiles,
                        in: 10 ... 200,
                        step: 1,
                        onEditingChanged: { editing in
                            isEditing = editing
                        }
                    )
                    Spacer()
                    Toggle(isOn: $state._indefinite) {
                        Text("Enable indefinitely")
                    }
                }
                if !state._indefinite {
                    HStack {
                        Text("Duration")
                        DecimalTextField("0", value: $state.durationProfile, formatter: formatter, cleanInput: false)
                        Text("minutes").foregroundColor(.secondary)
                    }
                }

                HStack {
                    Toggle(isOn: $state.override_target) {
                        Text("Override Profile Target")
                    }
                }
                if state.override_target {
                    HStack {
                        Text("Target Glucose")
                        DecimalTextField("0", value: $state.target, formatter: glucoseFormatter, cleanInput: false)
                        Text(state.units.rawValue).foregroundColor(.secondary)
                    }
                }
                HStack {
                    Toggle(isOn: $state.advancedSettings) {
                        Text("More options")
                    }
                }
                if state.advancedSettings {
                    HStack {
                        Toggle(isOn: $state.smbIsOff) {
                            Text("Disable SMBs")
                        }
                    }
                    HStack {
                        Toggle(isOn: $state.smbIsAlwaysOff) {
                            Text("Schedule when SMBs are Off")
                        }.disabled(!state.smbIsOff)
                    }
                    if state.smbIsAlwaysOff {
                        HStack {
                            Text("First Hour SMBs are Off (24 hours)")
                            DecimalTextField("0", value: $state.start, formatter: formatter, cleanInput: false)
                            Text("hour").foregroundColor(.secondary)
                        }
                        HStack {
                            Text("Last Hour SMBs are Off (24 hours)")
                            DecimalTextField("0", value: $state.end, formatter: formatter, cleanInput: false)
                            Text("hour").foregroundColor(.secondary)
                        }
                    }
                    HStack {
                        Toggle(isOn: $state.isfAndCr) {
                            Text("Change ISF and CR")
                        }
                    }
                    if !state.isfAndCr {
                        HStack {
                            Toggle(isOn: $state.isf) {
                                Text("Change ISF")
                            }
                        }
                        HStack {
                            Toggle(isOn: $state.cr) {
                                Text("Change CR")
                            }
                        }
                    }
                    HStack {
                        Text("SMB Minutes")
                        DecimalTextField(
                            "0",
                            value: $state.smbMinutes,
                            formatter: formatter,
                            cleanInput: false
                        )
                        Text("minutes").foregroundColor(.secondary)
                    }
                    HStack {
                        Text("UAM SMB Minutes")
                        DecimalTextField(
                            "0",
                            value: $state.uamMinutes,
                            formatter: formatter,
                            cleanInput: false
                        )
                        Text("minutes").foregroundColor(.secondary)
                    }
                }

                // MARK: TESTING

                HStack {
                    Button("Start new Profile") {
                        showAlert.toggle()

                        alertSring = "\(state.percentageProfiles.formatted(.number)) %, " +
                            (
                                state.durationProfile > 0 || !state
                                    ._indefinite ?
                                    (
                                        state
                                            .durationProfile
                                            .formatted(.number.grouping(.never).rounded().precision(.fractionLength(0))) +
                                            " min."
                                    ) :
                                    NSLocalizedString(" infinite duration.", comment: "")
                            ) +
                            (
                                (state.target == 0 || !state.override_target) ? "" :
                                    (" Target: " + state.target.formatted() + " " + state.units.rawValue + ".")
                            )
                            +
                            (
                                state
                                    .smbIsOff ?
                                    NSLocalizedString(
                                        " SMBs are disabled either by schedule or during the entire duration.",
                                        comment: ""
                                    ) : ""
                            )
                            +
                            "\n\n"
                            +
                            NSLocalizedString(
                                "Starting this override will change your Profiles and/or your Target Glucose used for looping during the entire selected duration. Tapping ”Start Profile” will start your new profile or edit your current active profile.",
                                comment: ""
                            )
                    }
                    .disabled(unChanged())
                    .buttonStyle(BorderlessButtonStyle())
                    .font(.callout)
                    .controlSize(.mini)
                    .alert(
                        "Start Profile",
                        isPresented: $showAlert,
                        actions: {
                            Button("Cancel", role: .cancel) { state.isEnabled = false }
                            Button("Start Profile", role: .destructive) {
                                if state._indefinite { state.durationProfile = 0 }
                                state.isEnabled.toggle()
                                state.saveSettings()
                                dismiss()
                            }
                        },
                        message: {
                            Text(alertSring)
                        }
                    )
                    Button {
                        isSheetPresented = true
                    }
                    label: { Text("Save as Profile") }
                        .tint(.orange)
                        .frame(maxWidth: .infinity, alignment: .trailing)
                        .buttonStyle(BorderlessButtonStyle())
                        .controlSize(.mini)
                        .disabled(unChanged())
                }
                .sheet(isPresented: $isSheetPresented) {
                    presetPopover
                }

                // MARK: TESTING END
            }

            header: { Text("Insulin") }
            footer: {
                Text(
                    "Your profile basal insulin will be adjusted with the override percentage and your profile ISF and CR will be inversly adjusted with the percentage."
                )
            }.listRowBackground(Color.chart)

            Button(action: {
                state.cancelProfile()
                dismiss()
            }, label: {
                HStack {
                    Spacer()
                    Text("Cancel Profile")
                    Spacer()
                    Image(systemName: "xmark.app")
                        .font(.title)
                }
            })
                .frame(maxWidth: .infinity, alignment: .center)
                .disabled(!state.isEnabled)
                .listRowBackground(!state.isEnabled ? Color(.systemGray4) : Color(.systemRed))
                .tint(.white)
        }

        @ViewBuilder func tempTargets() -> some View {
            if !state.presetsTT.isEmpty {
                Section(header: Text("Presets")) {
                    ForEach(state.presetsTT) { preset in
                        presetView(for: preset)
                    }
                }.listRowBackground(Color.chart)
            }

            HStack {
                Text("Experimental")
                Toggle(isOn: $state.viewPercantage) {}.controlSize(.mini)
                Image(systemName: "figure.highintensity.intervaltraining")
                Image(systemName: "fork.knife")
            }.listRowBackground(Color.chart)

            if state.viewPercantage {
                Section {
                    VStack {
                        Text("\(state.percentageTT.formatted(.number)) % Insulin")
                            .foregroundColor(isEditingTT ? .orange : .blue)
                            .font(.largeTitle)
                            .padding(.vertical)
                        Slider(
                            value: $state.percentageTT,
                            in: 15 ...
                                min(Double(state.maxValue * 100), 200),
                            step: 1,
                            onEditingChanged: { editing in
                                isEditingTT = editing
                            }
                        )
                        // Only display target slider when not 100 %
                        if state.percentageTT != 100 {
                            Spacer()
                            Divider()
                            Text(
                                (
                                    state
                                        .units == .mmolL ?
                                        "\(state.computeTarget().asMmolL.formatted(.number.grouping(.never).rounded().precision(.fractionLength(1)))) mmol/L" :
                                        "\(state.computeTarget().formatted(.number.grouping(.never).rounded().precision(.fractionLength(0)))) mg/dl"
                                )
                                    + NSLocalizedString(" Target Glucose", comment: "")
                            )
                            .foregroundColor(.green)
                            .padding(.vertical)

                            Slider(
                                value: $state.hbt,
                                in: 101 ... 295,
                                step: 1
                            ).accentColor(.green)
                        }
                    }
                }.listRowBackground(Color.chart)
            } else {
                Section(header: Text("Custom")) {
                    HStack {
                        Text("Target")
                        Spacer()
                        DecimalTextField("0", value: $state.low, formatter: formatter, cleanInput: true)
                        Text(state.units.rawValue).foregroundColor(.secondary)
                    }
                    HStack {
                        Text("Duration")
                        Spacer()
                        DecimalTextField("0", value: $state.durationTT, formatter: formatter, cleanInput: true)
                        Text("minutes").foregroundColor(.secondary)
                    }
                    DatePicker("Date", selection: $state.date)
                    HStack {
                        Button { state.enact() }
                        label: { Text("Enact") }
                            .disabled(state.durationTT == 0)
                            .buttonStyle(BorderlessButtonStyle())
                            .font(.callout)
                            .controlSize(.mini)

                        Button { isPromptPresented = true }
                        label: { Text("Save as preset") }
                            .disabled(state.durationTT == 0)
                            .tint(.orange)
                            .frame(maxWidth: .infinity, alignment: .trailing)
                            .buttonStyle(BorderlessButtonStyle())
                            .controlSize(.mini)
                    }
                }.listRowBackground(Color.chart)
            }
            if state.viewPercantage {
                Section {
                    HStack {
                        Text("Duration")
                        Spacer()
                        DecimalTextField("0", value: $state.durationTT, formatter: formatter, cleanInput: true)
                        Text("minutes").foregroundColor(.secondary)
                    }
                    DatePicker("Date", selection: $state.date)
                    HStack {
                        Button { state.enact() }
                        label: { Text("Enact") }
                            .disabled(state.durationTT == 0)
                            .buttonStyle(BorderlessButtonStyle())
                            .font(.callout)
                            .controlSize(.mini)

                        Button { isPromptPresented = true }
                        label: { Text("Save as preset") }
                            .disabled(state.durationTT == 0)
                            .tint(.orange)
                            .frame(maxWidth: .infinity, alignment: .trailing)
                            .buttonStyle(BorderlessButtonStyle())
                            .controlSize(.mini)
                    }
                }.listRowBackground(Color.chart)
            }

            Section {
                Button { state.cancel() }
                label: {
                    HStack {
                        Spacer()
                        Text("Cancel Temp Target")
                        Spacer()
                        Image(systemName: "xmark.app")
                            .font(.title)
                    }
                }
                .frame(maxWidth: .infinity, alignment: .center)
                .disabled(state.storage.current() == nil)
                .listRowBackground(state.storage.current() == nil ? Color(.systemGray4) : Color(.systemRed))
                .tint(.white)
            }
        }

        private func presetView(for preset: TempTarget) -> some View {
            var low = preset.targetBottom
            var high = preset.targetTop
            if state.units == .mmolL {
                low = low?.asMmolL
                high = high?.asMmolL
            }
            return HStack {
                VStack {
                    HStack {
                        Text(preset.displayName)
                        Spacer()
                    }
                    HStack(spacing: 2) {
                        Text(
                            "\(formatter.string(from: (low ?? 0) as NSNumber)!) - \(formatter.string(from: (high ?? 0) as NSNumber)!)"
                        )
                        .foregroundColor(.secondary)
                        .font(.caption)

                        Text(state.units.rawValue)
                            .foregroundColor(.secondary)
                            .font(.caption)
                        Text("for")
                            .foregroundColor(.secondary)
                            .font(.caption)
                        Text("\(formatter.string(from: preset.duration as NSNumber)!)")
                            .foregroundColor(.secondary)
                            .font(.caption)
                        Text("min")
                            .foregroundColor(.secondary)
                            .font(.caption)

                        Spacer()
                    }.padding(.top, 2)
                }
                .contentShape(Rectangle())
                .onTapGesture {
                    state.enactPreset(id: preset.id)
                }

                Image(systemName: "xmark.circle").foregroundColor(.secondary)
                    .contentShape(Rectangle())
                    .padding(.vertical)
                    .onTapGesture {
                        removeAlert = Alert(
                            title: Text("Are you sure?"),
                            message: Text("Delete preset \"\(preset.displayName)\""),
                            primaryButton: .destructive(Text("Delete"), action: { state.removePreset(id: preset.id) }),
                            secondaryButton: .cancel()
                        )
                        isRemoveAlertPresented = true
                    }
                    .alert(isPresented: $isRemoveAlertPresented) {
                        removeAlert!
                    }
            }
        }

        @ViewBuilder private func profilesView(for preset: OverridePresets) -> some View {
            let target = state.units == .mmolL ? (((preset.target ?? 0) as NSDecimalNumber) as Decimal)
                .asMmolL : (preset.target ?? 0) as Decimal
            let duration = (preset.duration ?? 0) as Decimal
            let name = ((preset.name ?? "") == "") || (preset.name?.isEmpty ?? true) ? "" : preset.name!
            let percent = preset.percentage / 100
            let perpetual = preset.indefinite
            let durationString = perpetual ? "" : "\(formatter.string(from: duration as NSNumber)!)"
            let scheduledSMBstring = (preset.smbIsOff && preset.smbIsAlwaysOff) ? "Scheduled SMBs" : ""
            let smbString = (preset.smbIsOff && scheduledSMBstring == "") ? "SMBs are off" : ""
            let targetString = target != 0 ? "\(glucoseFormatter.string(from: target as NSNumber)!)" : ""
            let maxMinutesSMB = (preset.smbMinutes as Decimal?) != nil ? (preset.smbMinutes ?? 0) as Decimal : 0
            let maxMinutesUAM = (preset.uamMinutes as Decimal?) != nil ? (preset.uamMinutes ?? 0) as Decimal : 0
            let isfString = preset.isf ? "ISF" : ""
            let crString = preset.cr ? "CR" : ""
            let dash = crString != "" ? "/" : ""
            let isfAndCRstring = isfString + dash + crString

            if name != "" {
                HStack {
                    VStack {
                        HStack {
                            Text(name)
                            Spacer()
                        }
                        HStack(spacing: 5) {
                            Text(percent.formatted(.percent.grouping(.never).rounded().precision(.fractionLength(0))))
                            if targetString != "" {
                                Text(targetString)
                                Text(targetString != "" ? state.units.rawValue : "")
                            }
                            if durationString != "" { Text(durationString + (perpetual ? "" : "min")) }
                            if smbString != "" { Text(smbString).foregroundColor(.secondary).font(.caption) }
                            if scheduledSMBstring != "" { Text(scheduledSMBstring) }
                            if preset.advancedSettings {
                                Text(maxMinutesSMB == 0 ? "" : maxMinutesSMB.formatted() + " SMB")
                                Text(maxMinutesUAM == 0 ? "" : maxMinutesUAM.formatted() + " UAM")
                                Text(isfAndCRstring)
                            }
                            Spacer()
                        }
                        .padding(.top, 2)
                        .foregroundColor(.secondary)
                        .font(.caption)
                    }
                    .contentShape(Rectangle())
                    .onTapGesture {
                        state.selectProfile(id_: preset.id ?? "")
                        state.hideModal()
                    }
                }
            }
        }

        private func unChanged() -> Bool {
            let isChanged = (
                state.percentageProfiles == 100 && !state.override_target && !state.smbIsOff && !state
                    .advancedSettings
            ) ||
                (!state._indefinite && state.durationProfile == 0) || (state.override_target && state.target == 0) ||
                (
                    state.percentageProfiles == 100 && !state.override_target && !state.smbIsOff && state.isf && state.cr && state
                        .smbMinutes == state.defaultSmbMinutes && state.uamMinutes == state.defaultUamMinutes
                )

            return isChanged
        }

        private func removeProfile(at offsets: IndexSet) {
            for index in offsets {
                let language = fetchedProfiles[index]
                moc.delete(language)
            }
            do {
                try moc.save()
            } catch {
                // To do: add error
            }
        }
    }
}