cmux/Sources/TabManager.swift

import SwiftUI
import Foundation

class Tab: Identifiable, ObservableObject {
    let id = UUID()
    @Published var title: String
    @Published var currentDirectory: String
    let terminalSurface: TerminalSurface

    init(title: String = "Terminal") {
        self.title = title
        self.currentDirectory = FileManager.default.homeDirectoryForCurrentUser.path
        self.terminalSurface = TerminalSurface()
    }
}

class TabManager: ObservableObject {
    @Published var tabs: [Tab] = []
    @Published var selectedTabId: UUID?

    init() {
        addTab()
    }

    func addTab() {
        let newTab = Tab(title: "Terminal \(tabs.count + 1)")
        tabs.append(newTab)
        selectedTabId = newTab.id
    }

    func closeTab(_ tab: Tab) {
        guard tabs.count > 1 else { return }

        if let index = tabs.firstIndex(where: { $0.id == tab.id }) {
            tabs.remove(at: index)

            if selectedTabId == tab.id {
                if index > 0 {
                    selectedTabId = tabs[index - 1].id
                } else {
                    selectedTabId = tabs.first?.id
                }
            }
        }
    }

    func closeCurrentTab() {
        guard let selectedId = selectedTabId,
              let tab = tabs.first(where: { $0.id == selectedId }) else { return }
        closeTab(tab)
    }

    func selectTab(_ tab: Tab) {
        selectedTabId = tab.id
    }

    func selectNextTab() {
        guard let currentId = selectedTabId,
              let currentIndex = tabs.firstIndex(where: { $0.id == currentId }) else { return }
        let nextIndex = (currentIndex + 1) % tabs.count
        selectedTabId = tabs[nextIndex].id
    }

    func selectPreviousTab() {
        guard let currentId = selectedTabId,
              let currentIndex = tabs.firstIndex(where: { $0.id == currentId }) else { return }
        let prevIndex = (currentIndex - 1 + tabs.count) % tabs.count
        selectedTabId = tabs[prevIndex].id
    }

    func selectTab(at index: Int) {
        guard index >= 0 && index < tabs.count else { return }
        selectedTabId = tabs[index].id
    }
}