import SwiftUI
import OrgSocialKit

struct SearchView: View {
    @State private var viewModel = SearchViewModel()
    @AppStorage("useRelay") private var useRelay = true

    var body: some View {
        NavigationStack {
            VStack(spacing: 0) {
                searchBar
                Divider()
                content
            }
            .navigationTitle("Search")
            .navigationBarTitleDisplayMode(.large)
            .navigationDestination(for: URL.self) { ProfileView(feedURL: $0) }
            .navigationDestination(for: ThreadRoute.self) {
                ThreadView(postURL: $0.postURL, relayURL: $0.relayURL)
            }
        }
    }

    private var searchBar: some View {
        VStack(spacing: 8) {
            HStack(spacing: 8) {
                HStack(spacing: 6) {
                    Image(systemName: "magnifyingglass").foregroundStyle(.secondary)
                    TextField(viewModel.isTagSearch ? "Tag name…" : "Search posts…", text: $viewModel.query)
                        .autocorrectionDisabled()
                        .textInputAutocapitalization(.never)
                        .submitLabel(.search)
                        .onSubmit { if useRelay { Task { await viewModel.search() } } }
                    if !viewModel.query.isEmpty {
                        Button { viewModel.query = "" } label: {
                            Image(systemName: "xmark.circle.fill").foregroundStyle(.secondary)
                        }
                        .buttonStyle(.plain)
                    }
                }
                .padding(8)
                .background(Color.secondary.opacity(0.1), in: RoundedRectangle(cornerRadius: 10))

                Button(viewModel.isTagSearch ? "#Tag" : "Text") {
                    viewModel.isTagSearch.toggle()
                }
                .font(.caption.weight(.semibold))
                .padding(.horizontal, 10).padding(.vertical, 8)
                .background(Color.accentColor.opacity(0.1), in: RoundedRectangle(cornerRadius: 10))
                .foregroundStyle(Color.accentColor)
            }

            Button {
                Task { await viewModel.search() }
            } label: {
                Label("Search", systemImage: "magnifyingglass")
                    .frame(maxWidth: .infinity)
            }
            .buttonStyle(.borderedProminent)
            .disabled(viewModel.query.trimmingCharacters(in: .whitespaces).isEmpty || viewModel.isLoading || !useRelay)

            if !useRelay {
                Text("Enable Use Relay in Settings to search.")
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
        }
        .padding()
    }

    @ViewBuilder
    private var content: some View {
        if viewModel.isLoading {
            ProgressView().frame(maxWidth: .infinity, maxHeight: .infinity)
        } else if let error = viewModel.errorMessage {
            ContentUnavailableView {
                Label("Search failed", systemImage: "exclamationmark.triangle")
            } description: {
                Text(error)
            }
        } else if viewModel.results.isEmpty && !viewModel.query.isEmpty {
            ContentUnavailableView(
                "No results",
                systemImage: "magnifyingglass",
                description: Text("No posts found for \"\(viewModel.query)\".")
            )
        } else if viewModel.results.isEmpty {
            ContentUnavailableView(
                "Search posts",
                systemImage: "magnifyingglass",
                description: Text("Enter a keyword or tag to search posts on the relay.")
            )
        } else {
            List {
                ForEach(viewModel.results, id: \.timestamp) { post in
                    PostRowView(post: post)
                        .listRowSeparator(.visible)
                        .listRowSeparatorTint(Color.secondary.opacity(0.2))
                        .listRowInsets(EdgeInsets(top: 12, leading: 16, bottom: 12, trailing: 16))
                        .listRowBackground(Color.clear)
                }
            }
            .listStyle(.plain)
        }
    }
}