import SwiftUI

/// What this instance hosts. `repo search` needs a query; this is the
/// listing you read when you do not know a name yet.
struct ExploreView: View {

    @State private var list: PagedListModel<PublicRepo>

    init(client: GitbayClient) {
        _list = State(initialValue: PagedListModel(
            client: client,
            argv: ["explore"],
            emptyMessage: "This instance hosts no public repositories."
        ))
    }

    /// One Text, not two: the HStack spaces its children, and a gap
    /// between the owner and the name would read as part of the path.
    private func path(of repo: PublicRepo) -> AttributedString {
        var owner = AttributedString(repo.owner + "/")
        owner.foregroundColor = .secondary
        var name = AttributedString(repo.name)
        name.font = .gbSans(.subheadline).weight(.medium)
        return owner + name
    }

    var body: some View {
        List {
            ForEach(list.state.value ?? []) { repo in
                NavigationLink(value: RepoRoute.repo(repo.path)) {
                    VStack(alignment: .leading, spacing: 4) {
                        HStack(spacing: 6) {
                            Text(path(of: repo))
                            if repo.isArchived {
                                GBChip("archived", .secondary)
                            }
                        }
                        .font(.gbSans(.subheadline))
                        .lineLimit(1)

                        if let description = repo.description, !description.isEmpty {
                            Text(description)
                                .font(.gbSans(.caption))
                                .foregroundStyle(.secondary)
                                .lineLimit(2)
                        }
                        if let topics = repo.topics, !topics.isEmpty {
                            ScrollView(.horizontal, showsIndicators: false) {
                                HStack(spacing: 6) {
                                    ForEach(topics, id: \.self) { topic in
                                        GBChip(topic, .gbAccent)
                                    }
                                }
                            }
                        }
                    }
                    .padding(.vertical, 2)
                }
            }
            PageFooter(list: list)
        }
        .overlay { LoadStateOverlay(state: list.state) }
        .navigationTitle("Explore")
        .task {
            if list.state.value == nil { await list.reload() }
        }
        .refreshable { await list.reload() }
    }
}