import ManaCore
import SwiftUI

/// Browse-View: Suche, Sortier-Picker, Sprachfilter, Liste der Resultate.
struct BrowseView: View {
    @Environment(AuthClient.self) private var auth
    @State private var store: MarketplaceStore?
    @State private var queryText: String = ""

    var body: some View {
        ZStack {
            CardsTheme.background.ignoresSafeArea()
            VStack(spacing: 0) {
                filters
                Divider().background(CardsTheme.border)
                resultsList
            }
        }
        .navigationTitle("Durchsuchen")
        #if os(iOS)
            .navigationBarTitleDisplayMode(.inline)
        #endif
            .searchable(
                text: $queryText,
                placement: .navigationBarDrawer(displayMode: .always),
                prompt: "Decks suchen"
            )
            .onSubmit(of: .search) {
                store?.browseQuery = queryText
                Task { await store?.browse() }
            }
            .task {
                if store == nil {
                    store = MarketplaceStore(auth: auth)
                    await store?.browse()
                }
            }
    }

    @ViewBuilder
    private var filters: some View {
        if let store {
            HStack {
                Picker("Sortierung", selection: Binding(
                    get: { store.browseSort },
                    set: { newValue in
                        store.browseSort = newValue
                        Task { await store.browse() }
                    }
                )) {
                    ForEach(MarketplaceSort.allCases, id: \.self) { sort in
                        Text(sort.label).tag(sort)
                    }
                }
                .pickerStyle(.segmented)
            }
            .padding(.horizontal, 16)
            .padding(.vertical, 8)
        }
    }

    @ViewBuilder
    private var resultsList: some View {
        if let store {
            if store.isLoadingBrowse, store.browseResults.isEmpty {
                Spacer()
                ProgressView()
                    .tint(CardsTheme.primary)
                Spacer()
            } else if store.browseResults.isEmpty {
                ContentUnavailableView(
                    "Keine Decks gefunden",
                    systemImage: "magnifyingglass",
                    description: Text("Versuche eine andere Suche oder Sortierung.")
                )
                .foregroundStyle(CardsTheme.foreground)
            } else {
                List {
                    ForEach(store.browseResults) { entry in
                        NavigationLink(value: MarketplaceRoute.publicDeck(slug: entry.slug)) {
                            BrowseRow(entry: entry)
                        }
                        .listRowBackground(Color.clear)
                        .listRowSeparator(.hidden)
                        .listRowInsets(EdgeInsets(top: 4, leading: 16, bottom: 4, trailing: 16))
                    }
                }
                .listStyle(.plain)
                .scrollContentBackground(.hidden)
                .refreshable {
                    await store.browse()
                }
            }
        }
    }
}

struct BrowseRow: View {
    let entry: PublicDeckEntry

    var body: some View {
        HStack(spacing: 12) {
            VStack(alignment: .leading, spacing: 4) {
                HStack {
                    Text(entry.title)
                        .font(.headline)
                        .foregroundStyle(CardsTheme.foreground)
                    if entry.isFeatured {
                        Image(systemName: "star.fill")
                            .font(.caption)
                            .foregroundStyle(CardsTheme.warning)
                    }
                }
                if let description = entry.description, !description.isEmpty {
                    Text(description)
                        .font(.caption)
                        .foregroundStyle(CardsTheme.mutedForeground)
                        .lineLimit(2)
                }
                HStack(spacing: 12) {
                    Label("\(entry.cardCount)", systemImage: "rectangle.stack")
                    Label("\(entry.starCount)", systemImage: "star")
                    if entry.isPaid {
                        Label("\(entry.priceCredits)", systemImage: "creditcard")
                            .foregroundStyle(CardsTheme.primary)
                    }
                    if let language = entry.language {
                        Text(language.uppercased())
                            .font(.caption2.weight(.semibold))
                            .padding(.horizontal, 4)
                            .padding(.vertical, 1)
                            .background(CardsTheme.muted, in: Capsule())
                    }
                }
                .font(.caption2)
                .foregroundStyle(CardsTheme.mutedForeground)
            }
            Spacer()
            Image(systemName: "chevron.right")
                .font(.footnote)
                .foregroundStyle(CardsTheme.mutedForeground)
        }
        .padding(.vertical, 8)
    }
}