import SwiftUI

/// Lets the user pick which repos the inbox monitors. Fetches the accessible
/// repos from the API and shows a toggle per repo. Empty selection = monitor
/// all.
struct MonitoredReposView: View {
    @Binding var selection: [String]
    @State private var repos: [Repository] = []
    @State private var isLoading = true
    @State private var errorMessage: String?

    var body: some View {
        Group {
            if isLoading {
                ProgressView("Loading repos…")
            } else if let errorMessage {
                ContentUnavailableView("Couldn't load repos",
                                       systemImage: "exclamationmark.triangle",
                                       description: Text(errorMessage))
            } else {
                List {
                    Section {
                        Button {
                            selection = []
                        } label: {
                            HStack {
                                Text("Monitor all repos")
                                Spacer()
                                if selection.isEmpty {
                                    Image(systemName: "checkmark")
                                        .foregroundColor(.accentColor)
                                }
                            }
                        }
                    }
                    Section("Monitored") {
                        ForEach(repos) { repo in
                            Button {
                                toggle(repo.fullName)
                            } label: {
                                HStack {
                                    Text(repo.fullName)
                                        .foregroundColor(.primary)
                                    Spacer()
                                    if selection.contains(repo.fullName) {
                                        Image(systemName: "checkmark")
                                            .foregroundColor(.accentColor)
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        .navigationTitle("Monitored repos")
        .navigationBarTitleDisplayMode(.inline)
        .task { await load() }
    }

    private func load() async {
        isLoading = true
        errorMessage = nil
        defer { isLoading = false }
        guard let client = SettingsStore.shared.client() else {
            errorMessage = "Not configured."
            return
        }
        do {
            repos = try await client.repos()
                .sorted { $0.fullName < $1.fullName }
        } catch {
            errorMessage = error.localizedDescription
        }
    }

    private func toggle(_ fullName: String) {
        if selection.contains(fullName) {
            selection.removeAll { $0 == fullName }
        } else {
            selection.append(fullName)
        }
    }
}