import SwiftUI
import AppKit

@MainActor final class ComposeModel: ObservableObject {
    @Published var projectName = ""
    @Published var projectURL: URL?
    @Published var services: [ComposeService] = []
    @Published var selectedService: String?
    @Published var status = "Ready"
    @Published var busy = false
    @Published var output = "Open a compose.yaml file to begin.\n"
    func openProject() {
        let panel = NSOpenPanel()
        panel.allowedContentTypes = [.yaml, .init(filenameExtension: "yml")!]
        panel.canChooseDirectories = false
        if panel.runModal() == .OK, let url = panel.url { load(url) }
    }
    func load(_ url: URL) {
        do {
            let project = try ComposeProject(file: url)
            projectName = project.name
            projectURL = url; services = project.services
            selectedService = services.first?.id
            output += "Loaded \(url.path) (\(services.count) services)\n"
        } catch { output += "ERROR: \(error)\n" }
    }
    func clearLog() { output = "" }
    func checkRuntime() {
        guard let url = projectURL else { output += "Open a Compose project first.\n"; return }
        run(url: url, action: "doctor")
    }
    func perform(_ action: String) {
        guard let url = projectURL else { return }
        run(url: url, action: action)
    }
    private func run(url: URL, action: String) {
        guard !busy else { return }
        guard !CommandLine.arguments.contains("--demo") else { output += "Demo mode is read-only. Relaunch normally to run Compose actions.\n"; return }
        busy = true; status = "Running \(action)…"; output += "\n$ container-compose \(action)\n"
        Task.detached {
            let result: String
            do { result = try ComposeEngine(ComposeProject(file: url)).execute(action) }
            catch { result = "ERROR: \(error)\n" }
            await MainActor.run {
                self.output += result + "\n"
                self.busy = false; self.status = "Ready"
            }
        }
    }
}