RouterOS/RouterOSAssistant/Features/Expert/ExpertMenuDetailView.swift

import SwiftUI

struct ExpertMenuDetailView: View {
    @ObservedObject var viewModel: ExpertViewModel
    let schema: RouterOSMenuSchema

    var body: some View {
        Form {
            Section {
                Text(schema.explanation)
                if let warning = schema.warning {
                    Label(warning, systemImage: "exclamationmark.triangle")
                        .font(.caption)
                        .foregroundStyle(.orange)
                }
            }

            Section {
                if viewModel.isLoading {
                    ProgressView()
                } else if let error = viewModel.loadError {
                    Text(error).foregroundStyle(.red)
                } else if viewModel.items.isEmpty {
                    Text("Keine Einträge unter \(schema.menuPath).").foregroundStyle(.secondary)
                } else {
                    ForEach(viewModel.items) { item in
                        HStack {
                            Button {
                                viewModel.startEditing(item)
                            } label: {
                                Text(rowLabel(for: item))
                            }
                            .buttonStyle(.plain)
                            Spacer()
                            // Not ".swipeActions" — that's an iOS/iPadOS gesture with no
                            // equivalent on macOS List rows, so it never showed anything here.
                            if !schema.isSingleton {
                                Button(role: .destructive) {
                                    viewModel.pendingRemoval = item
                                } label: {
                                    Image(systemName: "trash")
                                }
                                .buttonStyle(.plain)
                                .help("Eintrag löschen")
                            }
                        }
                        .contentShape(Rectangle())
                    }
                }
            } header: {
                HStack {
                    Text(schema.isSingleton ? "Einstellungen" : "Einträge")
                    Spacer()
                    if !schema.isSingleton {
                        Button("Neu hinzufügen") { viewModel.startNewItem() }
                    }
                }
            }
        }
        .formStyle(.grouped)
        .navigationTitle(schema.displayName)
        .task(id: schema.id) { await viewModel.reloadItems() }
        .sheet(item: $viewModel.editingItem) { item in
            ExpertItemEditView(
                viewModel: viewModel,
                schema: schema,
                isNew: item.id.isEmpty
            )
        }
        .confirmationDialog(
            "Eintrag wirklich löschen?",
            isPresented: Binding(
                get: { viewModel.pendingRemoval != nil },
                set: { if !$0 { viewModel.pendingRemoval = nil } }
            ),
            presenting: viewModel.pendingRemoval
        ) { item in
            Button("Löschen", role: .destructive) {
                Task { await viewModel.confirmRemoval(item) }
            }
            Button("Abbrechen", role: .cancel) {}
        } message: { item in
            Text(rowLabel(for: item))
        }
    }

    private func rowLabel(for item: RouterOSMenuItem) -> String {
        let columns = schema.listColumns.isEmpty ? Array(item.fields.keys.sorted()) : schema.listColumns
        let parts = columns.compactMap { key in item.fields[key].map { "\(key)=\($0)" } }
        return parts.isEmpty ? item.id : parts.joined(separator: "  ·  ")
    }
}

/// Add/edit sheet: curated fields (with tooltips) from the schema, plus a free-form "weitere
/// Parameter" list for anything the schema doesn't curate — so every field RouterOS actually
/// supports stays reachable even where this app hasn't described it yet.
private struct ExpertItemEditView: View {
    @ObservedObject var viewModel: ExpertViewModel
    let schema: RouterOSMenuSchema
    let isNew: Bool
    @Environment(\.dismiss) private var dismiss
    @State private var showApplyConfirmation = false

    var body: some View {
        Form {
            ForEach(schema.fields) { field in
                fieldEditor(for: field)
            }

            Section("Weitere Parameter (frei)") {
                Text("Für alles, was oben nicht als eigenes Feld aufgeführt ist — RouterOS-Parametername genau wie in der Dokumentation.")
                    .font(.caption)
                    .foregroundStyle(.secondary)
                ForEach($viewModel.extraFields) { $extra in
                    HStack {
                        TextField("Parameter", text: $extra.key)
                        TextField("Wert", text: $extra.value)
                        Button(role: .destructive) {
                            viewModel.extraFields.removeAll { $0.id == extra.id }
                        } label: {
                            Image(systemName: "minus.circle")
                        }
                    }
                }
                Button("Parameter hinzufügen") {
                    viewModel.extraFields.append(.init())
                }
            }

            if let command = viewModel.pendingCommand {
                Section("Wird ausgeführt") {
                    Text(command.cliLine)
                        .font(.system(.caption, design: .monospaced))
                        .foregroundStyle(.secondary)
                }
            }

            if let error = viewModel.applyError {
                Text(error).foregroundStyle(.red)
            }

            Section {
                HStack {
                    Button("Abbrechen") {
                        viewModel.cancelEditing()
                        dismiss()
                    }
                    Spacer()
                    Button(isNew ? "Anlegen" : "Speichern") {
                        showApplyConfirmation = true
                    }
                    .disabled(viewModel.isApplying || viewModel.pendingCommand == nil)
                }
            }
        }
        .formStyle(.grouped)
        .frame(minWidth: 420, minHeight: 480)
        .confirmationDialog(
            "Jetzt am Router anwenden?",
            isPresented: $showApplyConfirmation,
            titleVisibility: .visible
        ) {
            Button(isNew ? "Anlegen" : "Speichern") {
                Task {
                    await viewModel.saveEditingItem()
                    if viewModel.applyError == nil { dismiss() }
                }
            }
            Button("Abbrechen", role: .cancel) {}
        } message: {
            if let command = viewModel.pendingCommand {
                Text(command.cliLine)
            }
        }
    }

    @ViewBuilder
    private func fieldEditor(for field: RouterOSFieldSchema) -> some View {
        let binding = Binding<String>(
            get: { viewModel.formValues[field.key] ?? "" },
            set: { viewModel.formValues[field.key] = $0 }
        )
        Group {
            switch field.kind {
            case .text, .int:
                TextField(field.label, text: binding)
            case .bool:
                Toggle(field.label, isOn: Binding(
                    get: { binding.wrappedValue == "yes" || binding.wrappedValue == "true" },
                    set: { binding.wrappedValue = $0 ? "yes" : "no" }
                ))
            case .enumPick(let options):
                Picker(field.label, selection: binding) {
                    Text("–").tag("")
                    ForEach(options, id: \.self) { option in
                        Text(option).tag(option)
                    }
                }
            case .interfacePick:
                Picker(field.label, selection: binding) {
                    Text("–").tag("")
                    ForEach(viewModel.liveInterfaceNames, id: \.self) { name in
                        Text(name).tag(name)
                    }
                }
            case .menuItemPick(let menuPath, _, _):
                let options = viewModel.crossReferenceOptions[menuPath] ?? []
                Picker(field.label, selection: binding) {
                    Text("–").tag("")
                    ForEach(options, id: \.self) { option in
                        Text(option).tag(option)
                    }
                }
            case .duration:
                HStack {
                    Text(field.label)
                    Spacer()
                    DurationFieldEditor(value: binding)
                }
            }
        }
        .help(field.help.isEmpty ? field.label : field.help)
    }
}

/// Day/hour/minute/second steppers for a RouterOS time value (e.g. "1d12h30m") instead of a
/// bare text field where the suffix syntax isn't obvious. Reads any combination of RouterOS'
/// "<number><unit>" tokens (or a bare number, which RouterOS treats as seconds) and always
/// writes back the explicit suffixed form.
private struct DurationFieldEditor: View {
    @Binding var value: String

    @State private var days = 0
    @State private var hours = 0
    @State private var minutes = 0
    @State private var seconds = 0
    @State private var hasInitialized = false

    var body: some View {
        HStack(spacing: 10) {
            component("T", $days, 0...365)
            component("Std", $hours, 0...23)
            component("Min", $minutes, 0...59)
            component("Sek", $seconds, 0...59)
        }
        .onAppear {
            guard !hasInitialized else { return }
            hasInitialized = true
            parse(value)
        }
        .onChange(of: days) { _, _ in commit() }
        .onChange(of: hours) { _, _ in commit() }
        .onChange(of: minutes) { _, _ in commit() }
        .onChange(of: seconds) { _, _ in commit() }
    }

    private func component(_ unit: String, _ binding: Binding<Int>, _ range: ClosedRange<Int>) -> some View {
        VStack(spacing: 2) {
            Stepper(value: binding, in: range) {
                Text("\(binding.wrappedValue)")
                    .monospacedDigit()
                    .frame(minWidth: 26)
            }
            Text(unit)
                .font(.caption2)
                .foregroundStyle(.secondary)
        }
    }

    private func parse(_ raw: String) {
        let trimmed = raw.trimmingCharacters(in: .whitespaces)
        guard !trimmed.isEmpty else { return }
        if let bareSeconds = Int(trimmed) {
            seconds = bareSeconds % 60
            minutes = (bareSeconds / 60) % 60
            hours = (bareSeconds / 3600) % 24
            days = bareSeconds / 86400
            return
        }
        guard let regex = try? NSRegularExpression(pattern: #"(\d+)([dhms])"#) else { return }
        let nsText = trimmed as NSString
        for match in regex.matches(in: trimmed, range: NSRange(location: 0, length: nsText.length)) {
            guard let amount = Int(nsText.substring(with: match.range(at: 1))) else { continue }
            switch nsText.substring(with: match.range(at: 2)) {
            case "d": days = amount
            case "h": hours = amount
            case "m": minutes = amount
            case "s": seconds = amount
            default: break
            }
        }
    }

    private func commit() {
        var parts: [String] = []
        if days > 0 { parts.append("\(days)d") }
        if hours > 0 { parts.append("\(hours)h") }
        if minutes > 0 { parts.append("\(minutes)m") }
        if seconds > 0 { parts.append("\(seconds)s") }
        value = parts.joined()
    }
}