import Foundation
import SwiftUI

@MainActor
class ClubViewModel: ObservableObject {
    @Published var clubs: [Club] = []
    @Published var selectedClub: Club?
    @Published var members: [ClubMember] = []
    @Published var isLoading: Bool = false
    @Published var error: ClubError?
    @Published var filter: ClubFilter = ClubFilter()

    private let service: ClubServiceProtocol

    init(service: ClubServiceProtocol = ClubService()) {
        self.service = service
    }

    func fetchClubs() async {
        isLoading = true
        error = nil
        defer { isLoading = false }

        do {
            clubs = try await service.listClubs(filter: filter)
        } catch let error as ClubError {
            self.error = error
        } catch {
            print("Failed to fetch clubs: \(error)")
        }
    }

    func selectClub(id: String) async {
        isLoading = true
        error = nil
        defer { isLoading = false }

        do {
            let result = try await service.getClub(id: id)
            selectedClub = result.club
            members = result.members
            if let index = clubs.firstIndex(where: { $0.id == id }) {
                clubs[index] = result.club
                objectWillChange.send()
            }
        } catch let error as ClubError {
            self.error = error
        } catch {
            print("Failed to get club: \(error)")
        }
    }

    func createClub(request: CreateClubRequest) async -> Club? {
        isLoading = true
        error = nil
        defer { isLoading = false }

        do {
            let club = try await service.createClub(request: request)
            clubs.insert(club, at: 0)
            objectWillChange.send()
            return club
        } catch let error as ClubError {
            self.error = error
            return nil
        } catch {
            print("Failed to create club: \(error)")
            return nil
        }
    }

    func updateClub(id: String, request: UpdateClubRequest) async {
        isLoading = true
        error = nil
        defer { isLoading = false }

        do {
            let updatedClub = try await service.updateClub(id: id, request: request)
            if let index = clubs.firstIndex(where: { $0.id == id }) {
                clubs[index] = updatedClub
                objectWillChange.send()
            }
            if selectedClub?.id == id {
                selectedClub = updatedClub
            }
        } catch let error as ClubError {
            self.error = error
        } catch {
            print("Failed to update club: \(error)")
        }
    }

    func joinClub(id: String) async {
        do {
            try await service.joinClub(id: id)
            if let index = clubs.firstIndex(where: { $0.id == id }) {
                clubs[index].membershipStatus = .active
                clubs[index].memberCount += 1
                objectWillChange.send()
            }
        } catch {
            print("Failed to join club: \(error)")
        }
    }

    func leaveClub(id: String) async {
        do {
            try await service.leaveClub(id: id)
            if let index = clubs.firstIndex(where: { $0.id == id }) {
                clubs[index].membershipStatus = .left
                clubs[index].memberCount = max(0, clubs[index].memberCount - 1)
                objectWillChange.send()
            }
        } catch {
            print("Failed to leave club: \(error)")
        }
    }

    func inviteMember(clubId: String, email: String) async {
        do {
            try await service.inviteMember(clubId: clubId, email: email)
        } catch {
            print("Failed to invite member: \(error)")
        }
    }

    func removeMember(clubId: String, memberId: String) async {
        do {
            try await service.removeMember(clubId: clubId, memberId: memberId)
            if let index = members.firstIndex(where: { $0.id == memberId }) {
                members.remove(at: index)
                if let clubIndex = clubs.firstIndex(where: { $0.id == clubId }) {
                    clubs[clubIndex].memberCount = max(0, clubs[clubIndex].memberCount - 1)
                }
                objectWillChange.send()
            }
        } catch {
            print("Failed to remove member: \(error)")
        }
    }

    var publicClubs: [Club] {
        clubs.filter { $0.privacy == .publicPrivacy }
    }

    var userClubs: [Club] {
        clubs.filter { $0.membershipStatus == .active }
    }

    var pendingClubs: [Club] {
        clubs.filter { $0.membershipStatus == .pending }
    }

    var clubTypes: [ClubType] { ClubType.allCases }
    var privacyOptions: [ClubPrivacy] { ClubPrivacy.allCases }
}