//
//  TournamentCashierView.swift
//  PadelClub
//
//  Created by Razmig Sarkissian on 17/04/2024.
//

import SwiftUI

enum CashierDestination: Identifiable, Selectable {
    case summary
    case groupStage(GroupStage)
    case bracket(Round)
    case all(Tournament)
    
    var id: String { 
        switch self {
        case .summary, .all:
            return String(describing: self)
        case .groupStage(let groupStage):
            return groupStage.id
        case .bracket(let round):
            return round.id
        }
    }
    
    func selectionLabel() -> String {
        switch self {
        case .summary:
            return "Bilan"
        case .groupStage(let groupStage):
            return groupStage.selectionLabel()
        case .bracket(let round):
            return round.selectionLabel()
        case .all:
            return "Tous"
        }
    }
    
    func badgeValue() -> Int? {
        switch self {
        case .summary:
            return nil
        case .groupStage(let groupStage):
            return groupStage.unsortedPlayers().filter({ $0.hasPaid() == false }).count
        case .bracket(let round):
            return round.seeds().flatMap { $0.unsortedPlayers() }.filter({ $0.hasPaid() == false }).count
        case .all(let tournament):
            return tournament.selectedPlayers().filter({ $0.hasPaid() == false }).count
        }
    }
    
    func badgeValueColor() -> Color? {
        return nil
    }
    
    func badgeImage() -> Badge? {
        switch self {
        case .summary:
            return nil
        case .groupStage(let groupStage):
            return groupStage.unsortedPlayers().allSatisfy({ $0.hasPaid() }) ? .checkmark : nil
        case .bracket(let round):
            return round.seeds().flatMap { $0.unsortedPlayers() }.allSatisfy({ $0.hasPaid() }) ? .checkmark : nil
        case .all(let tournament):
            return tournament.selectedPlayers().allSatisfy({ $0.hasPaid() }) ? .checkmark : nil
        }
    }

}

struct TournamentCashierView: View {
    var tournament: Tournament
    @State private var selectedDestination: CashierDestination?
    
    func allDestinations() -> [CashierDestination] {
        var allDestinations : [CashierDestination] = []
        let tournamentHasEnded = tournament.hasEnded()
        if tournamentHasEnded {
            allDestinations.append(.summary)
        }

        allDestinations.append(.all(tournament))

        let destinations : [CashierDestination] = tournament.groupStages().map { CashierDestination.groupStage($0) }
        allDestinations.append(contentsOf: destinations)
        tournament.rounds().forEach { round in
            if round.seeds().isEmpty == false {
                allDestinations.append(CashierDestination.bracket(round))
            }
        }
        
        if tournamentHasEnded == false {
            allDestinations.append(.summary)
        }

        return allDestinations
    }

    init(tournament: Tournament) {
        self.tournament = tournament
        if tournament.hasEnded() {
            if tournament.players().anySatisfy({ $0.hasPaid() == false }) == false {
                _selectedDestination = .init(wrappedValue: .summary)
            } else {
                _selectedDestination = .init(wrappedValue: .all(tournament))
            }
        } else {
            let gs = tournament.getActiveGroupStage()
            if let gs {
                _selectedDestination = State(wrappedValue: .groupStage(gs))
            } else if let rs = tournament.getActiveRound(withSeeds: true) {
                _selectedDestination = State(wrappedValue: .bracket(rs))
            }
        }
    }
    
    var body: some View {
        VStack(spacing: 0) {
            GenericDestinationPickerView(selectedDestination: $selectedDestination, destinations: allDestinations(), nilDestinationIsValid: true)
            switch selectedDestination {
            case .none:
                CashierSettingsView(tournament: tournament)
            case .some(let selectedCall):
                switch selectedCall {
                case .summary:
                    CashierDetailView(tournament: tournament)
                case .groupStage(let groupStage):
                    CashierView(tournament: tournament, teams: groupStage.teams())
                case .bracket(let round):
                    CashierView(tournament: tournament, teams: round.seeds())
                case .all(let tournament):
                    CashierView(tournament: tournament, teams: tournament.selectedSortedTeams())
                }
            }
        }
        .environment(tournament)
        .navigationBarTitleDisplayMode(.inline)
        .toolbarBackground(.visible, for: .navigationBar)
        .navigationTitle("Encaissement")
    }
}

#Preview {
    TournamentCashierView(tournament: Tournament.mock())
}