//
//  MetrikaApp.swift
//  Metrika
//
//  Author:  Simon-Pierre Boucher
//  Contact: contact@spboucher.ai
//  Copyright © 2026 Simon-Pierre Boucher. All rights reserved.
//

import SwiftUI

@main
struct MetrikaApp: App {
    @State private var model = SessionModel()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(model)
                .frame(minWidth: 900, minHeight: 560)
        }
        .windowStyle(.automatic)
    }
}

struct ContentView: View {
    enum Pane: String, CaseIterable {
        case console = "Console"
        case data = "Data"
        case doFile = "Do-file"
        case manual = "Manual"
    }

    @Environment(SessionModel.self) private var model
    @State private var pane: Pane = ContentView.initialPane()

    /// Debug hook for headless screenshots: METRIKA_AUTOPANE selects the
    /// pane shown at launch.
    private static func initialPane() -> Pane {
        #if DEBUG
        if let name = ProcessInfo.processInfo.environment["METRIKA_AUTOPANE"],
           let selected = Pane(rawValue: name) {
            return selected
        }
        #endif
        return .console
    }

    var body: some View {
        NavigationSplitView {
            VariablesSidebar()
        } detail: {
            Group {
                switch pane {
                case .console:
                    HSplitView {
                        ConsoleView()
                            .frame(minWidth: 480)
                        if model.lastPlot != nil {
                            PlotView()
                                .frame(minWidth: 300)
                        }
                    }
                case .data:
                    DataBrowserPane()
                case .doFile:
                    DoFileEditorPane()
                case .manual:
                    ManualPane()
                }
            }
            .toolbar {
                ToolbarItem(placement: .principal) {
                    Picker("Pane", selection: $pane) {
                        ForEach(Pane.allCases, id: \.self) { pane in
                            Text(pane.rawValue).tag(pane)
                        }
                    }
                    .pickerStyle(.segmented)
                }
            }
        }
        .navigationTitle("Metrika")
    }
}