//
//  ScheduleListView.swift
//  SportsTime
//

import SwiftUI

struct ScheduleListView: View {
    @Environment(\.colorScheme) private var colorScheme
    @State private var viewModel = ScheduleViewModel()
    @State private var showDatePicker = false

    var body: some View {
        Group {
            if viewModel.isLoading && viewModel.games.isEmpty {
                loadingView
            } else if let errorMessage = viewModel.errorMessage {
                errorView(message: errorMessage)
            } else if viewModel.games.isEmpty {
                emptyView
            } else {
                gamesList
            }
        }
        .searchable(text: $viewModel.searchText, prompt: "Search teams or venues")
        .scrollContentBackground(.hidden)
        .themedBackground()
        .toolbar {
            ToolbarItem(placement: .primaryAction) {
                Menu {
                    Button {
                        showDatePicker = true
                    } label: {
                        Label("Date Range", systemImage: "calendar")
                    }

                    if viewModel.hasFilters {
                        Button(role: .destructive) {
                            viewModel.resetFilters()
                        } label: {
                            Label("Clear Filters", systemImage: "xmark.circle")
                        }
                    }
                } label: {
                    Image(systemName: viewModel.hasFilters ? "line.3.horizontal.decrease.circle.fill" : "line.3.horizontal.decrease.circle")
                }
            }
        }
        .sheet(isPresented: $showDatePicker) {
            DateRangePickerSheet(
                startDate: viewModel.startDate,
                endDate: viewModel.endDate
            ) { start, end in
                viewModel.updateDateRange(start: start, end: end)
            }
            .presentationDetents([.medium])
        }
        .task {
            await viewModel.loadGames()
        }
    }

    // MARK: - Sport Filter

    private var sportFilter: some View {
        ScrollView(.horizontal, showsIndicators: false) {
            HStack(spacing: 8) {
                ForEach(Sport.supported) { sport in
                    SportFilterChip(
                        sport: sport,
                        isSelected: viewModel.selectedSports.contains(sport)
                    ) {
                        viewModel.toggleSport(sport)
                    }
                }
            }
            .padding(.horizontal)
            .padding(.vertical, 8)
        }
    }

    // MARK: - Games List

    private var gamesList: some View {
        List {
            Section {
                sportFilter
                    .listRowInsets(EdgeInsets())
                    .listRowBackground(Color.clear)
            }

            ForEach(viewModel.gamesBySport, id: \.sport) { sportGroup in
                Section {
                    ForEach(sportGroup.games) { richGame in
                        GameRowView(game: richGame, showDate: true)
                    }
                } header: {
                    HStack(spacing: 8) {
                        Image(systemName: sportGroup.sport.iconName)
                        Text(sportGroup.sport.rawValue)
                    }
                    .font(.headline)
                }
                .listRowBackground(Theme.cardBackground(colorScheme))
            }
        }
        .listStyle(.plain)
        .scrollContentBackground(.hidden)
        .refreshable {
            await viewModel.loadGames()
        }
    }

    // MARK: - Empty State

    private var emptyView: some View {
        VStack(spacing: 16) {
            sportFilter

            ContentUnavailableView {
                Label("No Games Found", systemImage: "sportscourt")
            } description: {
                Text("Try adjusting your filters or date range")
            } actions: {
                Button("Reset Filters") {
                    viewModel.resetFilters()
                }
                .buttonStyle(.bordered)
            }
        }
    }

    // MARK: - Loading State

    private var loadingView: some View {
        VStack(spacing: 16) {
            ThemedSpinner(size: 44)
            Text("Loading schedule...")
                .foregroundStyle(.secondary)
        }
    }

    // MARK: - Error State

    private func errorView(message: String) -> some View {
        ContentUnavailableView {
            Label("Unable to Load", systemImage: "exclamationmark.icloud")
        } description: {
            Text(message)
        } actions: {
            Button {
                viewModel.clearError()
                Task {
                    await viewModel.loadGames()
                }
            } label: {
                Text("Try Again")
            }
            .buttonStyle(.bordered)
        }
    }

    // MARK: - Helpers

    private func formatSectionDate(_ date: Date) -> String {
        let calendar = Calendar.current
        let formatter = DateFormatter()

        if calendar.isDateInToday(date) {
            return "Today"
        } else if calendar.isDateInTomorrow(date) {
            return "Tomorrow"
        } else {
            formatter.dateFormat = "EEEE, MMM d"
            return formatter.string(from: date)
        }
    }
}

// MARK: - Sport Filter Chip

struct SportFilterChip: View {
    let sport: Sport
    let isSelected: Bool
    let action: () -> Void

    var body: some View {
        Button(action: action) {
            HStack(spacing: 6) {
                Image(systemName: sport.iconName)
                    .font(.caption)
                Text(sport.rawValue)
                    .font(.caption)
                    .fontWeight(.medium)
            }
            .padding(.horizontal, 12)
            .padding(.vertical, 8)
            .background(isSelected ? Color.blue : Color(.secondarySystemBackground))
            .foregroundStyle(isSelected ? .white : .primary)
            .clipShape(Capsule())
        }
        .buttonStyle(.plain)
    }
}

// MARK: - Game Row View

struct GameRowView: View {
    let game: RichGame
    var showDate: Bool = false

    private var isToday: Bool {
        Calendar.current.isDateInToday(game.game.dateTime)
    }

    var body: some View {
        VStack(alignment: .leading, spacing: 8) {
            // Date (when grouped by sport)
            if showDate {
                HStack(spacing: 6) {
                    Text(formattedDate)
                        .font(.caption)
                        .fontWeight(.medium)
                        .foregroundStyle(.secondary)

                    if isToday {
                        Text("TODAY")
                            .font(.caption2)
                            .fontWeight(.bold)
                            .foregroundStyle(.white)
                            .padding(.horizontal, 6)
                            .padding(.vertical, 2)
                            .background(Color.orange)
                            .clipShape(Capsule())
                    }
                }
            }

            // Teams
            HStack {
                VStack(alignment: .leading, spacing: 4) {
                    HStack(spacing: 8) {
                        TeamBadge(team: game.awayTeam, isHome: false)
                        Text("@")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                        TeamBadge(team: game.homeTeam, isHome: true)
                    }
                }

                Spacer()
            }

            // Game info
            HStack(spacing: 12) {
                Label(game.game.gameTime, systemImage: "clock")
                Label(game.stadium.name, systemImage: "building.2")

                if let broadcast = game.game.broadcastInfo {
                    Label(broadcast, systemImage: "tv")
                }
            }
            .font(.caption)
            .foregroundStyle(.secondary)
        }
        .padding(.vertical, 4)
        .listRowBackground(isToday ? Color.orange.opacity(0.1) : nil)
    }

    private var formattedDate: String {
        let formatter = DateFormatter()
        formatter.dateFormat = "EEE, MMM d"
        return formatter.string(from: game.game.dateTime)
    }
}

// MARK: - Team Badge

struct TeamBadge: View {
    let team: Team
    let isHome: Bool

    var body: some View {
        HStack(spacing: 4) {
            if let colorHex = team.primaryColor {
                Circle()
                    .fill(Color(hex: colorHex))
                    .frame(width: 8, height: 8)
            }

            Text(team.abbreviation)
                .font(.subheadline)
                .fontWeight(isHome ? .bold : .regular)

            Text(team.city)
                .font(.caption)
                .foregroundStyle(.secondary)
        }
    }
}

// MARK: - Date Range Picker Sheet

struct DateRangePickerSheet: View {
    @Environment(\.dismiss) private var dismiss

    @State var startDate: Date
    @State var endDate: Date
    let onApply: (Date, Date) -> Void

    var body: some View {
        NavigationStack {
            Form {
                Section("Date Range") {
                    DatePicker("Start", selection: $startDate, displayedComponents: .date)
                    DatePicker("End", selection: $endDate, in: startDate..., displayedComponents: .date)
                }

                Section {
                    Button("Next 7 Days") {
                        startDate = Date()
                        endDate = Calendar.current.date(byAdding: .day, value: 7, to: Date()) ?? Date()
                    }

                    Button("Next 14 Days") {
                        startDate = Date()
                        endDate = Calendar.current.date(byAdding: .day, value: 14, to: Date()) ?? Date()
                    }

                    Button("Next 30 Days") {
                        startDate = Date()
                        endDate = Calendar.current.date(byAdding: .day, value: 30, to: Date()) ?? Date()
                    }
                }
            }
            .navigationTitle("Select Dates")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Cancel") {
                        dismiss()
                    }
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button("Apply") {
                        onApply(startDate, endDate)
                        dismiss()
                    }
                }
            }
        }
    }
}

#Preview {
    NavigationStack {
        ScheduleListView()
    }
}