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import SwiftData
import SwiftUI

struct IdentifyView: View {
    // Navigation
    @Environment(IdentifyCoordinator.self) private var coordinator
    @State private var selectedFamily: Family?
    
    // Search and sort
    @State private var searchText: String = ""
    @State private var sortOrder: SortOrder = .alphabetical
    @FocusState private var searchFieldIsFocused: Bool
    
    // Data
    @Query private var families: [Family]
    
    // Navigation title
    @State private var navigationTitleVisible: Bool = true
    
    private var filteredFamilies: [Family] {
        let trimmedSearchText = searchText.trimmingCharacters(in: .whitespacesAndNewlines)
        let filtered = trimmedSearchText.isEmpty
            ? families
            : families.filter { $0.scientificName.localizedCaseInsensitiveContains(trimmedSearchText) }
        
        switch sortOrder {
        case .alphabetical:
            return filtered.sorted { $0.scientificName.localizedCaseInsensitiveCompare($1.scientificName) == .orderedAscending }
        case .reverseAlphabetical:
            return filtered.sorted { $0.scientificName.localizedCaseInsensitiveCompare($1.scientificName) == .orderedDescending }
        }
    }
    
    init() {
        let appearance = UINavigationBarAppearance()
        appearance.backgroundColor = UIColor(named: "primaryBackground")

        UINavigationBar.appearance().standardAppearance = appearance
    }
    
    var body: some View {
        NavigationStack(path: Binding(
            get: { coordinator.navigationPath },
            set: { coordinator.navigationPath = $0 }
        )) {
            ScrollView {
                Text("Identify")
                    .font(.largeTitle)
                    .bold()
                    .fontDesign(.serif)
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding(.bottom, 1)
                    .onScrollVisibilityChange(threshold: 0.01) { isVisible in
                        navigationTitleVisible = isVisible
                    }
                
                HStack {
                    TextField("Search families", text: $searchText)
                        .focused($searchFieldIsFocused)
                        .padding(.vertical, 8)
                        .padding(.horizontal, 12)
                        .background(.secondaryBackground)
                        .clipShape(RoundedRectangle(cornerRadius: 8))
                        .foregroundStyle(.primaryForeground)
                        .autocorrectionDisabled()
                    
                    if searchFieldIsFocused {
                        Button {
                            withAnimation {
                                searchText = ""
                                searchFieldIsFocused.toggle()
                            }
                        } label: {
                            Text(searchFieldIsFocused ? "Cancel" : "")
                                .foregroundStyle(.accent)
                        }
                        .transition(.opacity.combined(with: .move(edge: .trailing)))
                        .padding(.vertical, -2)
                    }
                }
                .animation(.easeInOut, value: searchFieldIsFocused)
                
                LazyVStack(alignment: .leading) {
                    ForEach(filteredFamilies, id: \.self) { family in
                        IdentifyTileView(family: family)
                            .onTapGesture {
                                HapticsManager.shared.fireHaptic(.impact)
                                coordinator.pushToFamilyView(for: family)
                            }
                    }
                }
            }
            .padding(.horizontal)
            .scrollIndicators(.hidden)
            .navigationDestination(for: IdentifyCoordinator.Screen.self) { screen in
                switch screen {
                case .identify:
                    EmptyView()
                case .species(let family):
                    SpeciesListView(family: family)
                }
            }
            .toolbar {
                ToolbarItem(placement: .principal) {
                    if !navigationTitleVisible {
                        Text("Identify")
                            .fontDesign(.serif)
                            .bold()
                    }
                }
                ToolbarItem(placement: .navigationBarTrailing) {
                    Menu {
                        Button("A-Z") {
                            withAnimation {
                                HapticsManager.shared.fireHaptic(.impact)
                                sortOrder = .alphabetical
                            }
                        }
                        Button("Z-A") {
                            withAnimation {
                                HapticsManager.shared.fireHaptic(.impact)
                                sortOrder = .reverseAlphabetical
                            }
                        }
                    } label: {
                        Image(systemName: sortOrder == .alphabetical ? "text.line.first.and.arrowtriangle.forward" :"text.line.last.and.arrowtriangle.forward")
                            .symbolRenderingMode(.hierarchical)
                            .foregroundStyle(Color.accentColor)
                            .symbolEffect(.bounce, value: sortOrder)
                    } primaryAction: {
                        HapticsManager.shared.fireHaptic(.impact)
                        withAnimation {
                            sortOrder = sortOrder == .alphabetical ? .reverseAlphabetical : .alphabetical
                        }
                    }
                }
            }
            .background(.primaryBackground)
            .foregroundStyle(.primaryForeground)
        }
    }
}