import SwiftUI

struct AddressesView: View {
    let message: String?
    @Binding var appState: AppState
    var selectionMode: Bool = false
    @Environment(\.dismiss) var dismiss
    @State var isLoading = false
    @State var errorMessage: String? = nil
    @State var addresses: [CustomerAddress] = []
    @State var openAddAddressForm = false
    @State var editingAddress: CustomerAddress? = nil
    @State var openSwipeRowId: String? = nil
    @State var deletingRowId: String? = nil

    let tabBarClearance: CGFloat = 96

    var body: some View {
        ZStack {
            AppColors.backgroundLight
                .ignoresSafeArea()

            ScrollView(showsIndicators: false) {
                VStack(spacing: 20) {
                    header

                    if let message {
                        Text(message)
                            .font(AppTypography.body)
                            .foregroundStyle(AppColors.textPrimary)
                            .multilineTextAlignment(.center)
                            .padding(.horizontal, 20)
                            .padding(.vertical, 14)
                            .frame(maxWidth: .infinity, alignment: .center)
                            .background(AppColors.brandSoft)
                            .clipShape(RoundedRectangle(cornerRadius: AppLayout.radiusLG, style: .continuous))
                    }

                    VStack(spacing: 16) {
                        if isLoading {
                            ProgressView()
                                .padding(.top, 24)
                        } else if let errorMessage {
                            Text(errorMessage)
                                .font(AppTypography.body)
                                .foregroundStyle(AppColors.textMuted)
                                .multilineTextAlignment(.center)
                                .padding(.top, 24)
                        } else if addresses.isEmpty {
                            Text("Nenhum endereço cadastrado")
                                .font(AppTypography.body)
                                .foregroundStyle(AppColors.textMuted)
                                .padding(.top, 24)
                        } else {
                            ForEach(Array(addresses.enumerated()), id: \.offset) { index, address in
                                let rowId = addressRowId(for: address, index: index)
                                let isSelected: Bool = {
                                    if let selectedId = appState.address.selectedId {
                                        return address.id == selectedId
                                    }
                                    return index == 0
                                }()

                                if selectionMode {
                                    Button {
                                        selectAddress(address)
                                    } label: {
                                        AddressCard(item: addressToListItem(address, isPrimary: isSelected))
                                    }
                                    .buttonStyle(.plain)
                                } else {
                                    SwipeToDeleteAddressRow(
                                        rowId: rowId,
                                        openRowId: $openSwipeRowId,
                                        isDeleting: deletingRowId == rowId,
                                        onDelete: { deleteAddress(address, rowId: rowId) }
                                    ) {
                                        AddressCard(
                                            item: addressToListItem(address, isPrimary: isSelected),
                                            onEdit: { beginEditing(address) }
                                        )
                                        .contentShape(Rectangle())
                                        .onTapGesture {
                                            if openSwipeRowId == rowId {
                                                openSwipeRowId = nil
                                            }
                                        }
                                    }
                                    .id(rowId)
                                    .opacity(deletingRowId == rowId ? 0.6 : 1.0)
                                    .disabled(deletingRowId != nil)
                                }
                            }
                        }
                    }
                }
                .padding(.horizontal, 20)
                .padding(.top, 18)
            }

            VStack {
                Spacer()
                bottomOverlay
                    .padding(.bottom, tabBarClearance)
            }

        }
        .navigationBarBackButtonHidden(true)
        .toolbar(.hidden, for: .navigationBar)
        .sheet(isPresented: $openAddAddressForm) {
            NavigationStack {
                AddAddressFormView(existingAddress: editingAddress) { updatedAddresses, wasEditing in
                    addresses = updatedAddresses
                    applyPreferredAddress(from: updatedAddresses)
                    let title = wasEditing ? "Endereço atualizado com sucesso." : "Endereço adicionado com sucesso."
                    SnackbarCenter.shared.show(title: title, style: .success, icon: "checkmark.seal.fill", duration: 3.0)
                }
            }
        }
        .onChange(of: openAddAddressForm) { _, isOpen in
            if isOpen == false {
                editingAddress = nil
            }
        }
        .onAppear {
            if isLoading == false, addresses.isEmpty {
                Task {
                    await loadAddresses()
                }
            }
        }
    }

    var header: some View {
        ZStack {
            Text("Meus Endereços")
                .font(AppTypography.heading2)
                .foregroundStyle(AppColors.textPrimary)

            HStack {
                Button(action: { dismiss() }) {
                    Image(systemName: "chevron.left")
                        .font(.system(size: 24, weight: .semibold))
                        .foregroundStyle(AppColors.textPrimary)
                        .frame(width: 52, height: 52)
                        .background(AppColors.surface)
                        .clipShape(Circle())
                        .shadow(color: .black.opacity(0.06), radius: 8, y: 2)
                }

                Spacer()
            }
        }
    }

    var bottomOverlay: some View {
        ZStack(alignment: .bottom) {
            Rectangle()
                .fill(AppColors.backgroundLight)
                .frame(height: 136)

            Button(action: {
                editingAddress = nil
                openAddAddressForm = true
            }) {
                HStack(spacing: 12) {
                    Image(systemName: "mappin.circle.fill")
                        .font(.system(size: 24))
                    Text("Adicionar novo endereço")
                        .font(AppTypography.heading3)
                }
                .foregroundStyle(AppColors.textInverse)
                .frame(maxWidth: .infinity)
                .padding(.vertical, 18)
                .background(AppColors.primary)
                .clipShape(RoundedRectangle(cornerRadius: AppLayout.radiusXL, style: .continuous))
            }
            .buttonStyle(.plain)
            .padding(.horizontal, 20)
            .padding(.bottom, 14)
        }
    }

    private func selectAddress(_ address: CustomerAddress) {
        appState.address.selectedId = address.id
        let label = (address.label ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
        appState.address.display = label.isEmpty ? "Defina seu endereco" : label

        if let lat = address.latLong?.first, let lng = address.latLong?.dropFirst().first {
            appState.address.latitude = lat
            appState.address.longitude = lng
        } else {
            appState.address.latitude = nil
            appState.address.longitude = nil
        }

        SessionStateStore.saveAddress(appState.address)

        if selectionMode {
            dismiss()
        }
    }

    private func beginEditing(_ address: CustomerAddress) {
        openSwipeRowId = nil
        editingAddress = address
        openAddAddressForm = true
    }

    private func applyPreferredAddress(from updatedAddresses: [CustomerAddress]) {
        let selected = updatedAddresses.first(where: { $0.id == appState.address.selectedId }) ?? updatedAddresses.first
        appState.address.selectedId = selected?.id
        appState.address.display = selected?.label?.isEmpty == false ? (selected?.label ?? "Defina seu endereco") : "Defina seu endereco"

        if let lat = selected?.latLong?.first, let lng = selected?.latLong?.dropFirst().first {
            appState.address.latitude = lat
            appState.address.longitude = lng
        } else {
            appState.address.latitude = nil
            appState.address.longitude = nil
        }

        SessionStateStore.saveAddress(appState.address)
    }

    private func addressRowId(for address: CustomerAddress, index: Int) -> String {
        if let id = address.id, id.isEmpty == false {
            return "addr:\(id)"
        }
        return "idx:\(index):\(address.label ?? ""):\(address.address ?? ""):\(address.number ?? "")"
    }

    private func deleteAddress(_ address: CustomerAddress, rowId: String) {
        guard deletingRowId == nil else { return }
        deletingRowId = rowId
        openSwipeRowId = nil

        Task {
            do {
                let response = try await ApiService().deleteCustomerAddress(address)
                await MainActor.run {
                    deletingRowId = nil

                    guard response.error == false else {
                        let message = response.message ?? "Não foi possível excluir o endereço."
                        SnackbarCenter.shared.show(title: message, style: .error, icon: "xmark.octagon.fill", duration: 4.0)
                        return
                    }

                    let updatedAddresses = response.result?.addressBook ?? []
                    addresses = updatedAddresses
                    applyPreferredAddress(from: updatedAddresses)
                    SnackbarCenter.shared.show(title: "Endereço removido com sucesso.", style: .success, icon: "checkmark.seal.fill", duration: 3.0)
                }
            } catch {
                await MainActor.run {
                    deletingRowId = nil
                    let message = error.localizedDescription
                    SnackbarCenter.shared.show(title: message, style: .error, icon: "xmark.octagon.fill", duration: 4.0)
                }
            }
        }
    }

    func addressToListItem(_ address: CustomerAddress, isPrimary: Bool) -> AddressListItem {
        let title = address.label?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty == false ? (address.label ?? "Endereço") : "Endereço"
        let line1 = [address.address, address.number]
            .compactMap { $0?.trimmingCharacters(in: .whitespacesAndNewlines) }
            .filter { $0.isEmpty == false }
            .joined(separator: ", ")
        let line2 = [address.neighborhood, address.city, address.state]
            .compactMap { $0?.trimmingCharacters(in: .whitespacesAndNewlines) }
            .filter { $0.isEmpty == false }
            .joined(separator: ", ")
        let detail = [line1, line2]
            .filter { $0.isEmpty == false }
            .joined(separator: " - ")

        return AddressListItem(
            title: title,
            detail: detail.isEmpty ? "Endereço sem detalhes" : detail,
            icon: iconName(for: title),
            isPrimary: isPrimary
        )
    }

    func iconName(for label: String) -> String {
        let normalized = label.folding(options: [.diacriticInsensitive, .caseInsensitive], locale: .current)
        if normalized.contains("casa") {
            return "house.fill"
        }
        if normalized.contains("trabalho") {
            return "briefcase.fill"
        }
        return "mappin.and.ellipse"
    }

    @MainActor
    func loadAddresses() async {
        isLoading = true
        errorMessage = nil

        do {
            let service = ApiService()
            let response = try await service.profile()
            guard response.error == false else {
                errorMessage = response.message ?? "Não foi possível carregar os endereços."
                isLoading = false
                return
            }

            if let customer = response.result {
                appState.profile.id = customer.id
                appState.profile.name = customer.name
                appState.profile.email = customer.email
                appState.profile.phone = customer.phoneNumber ?? appState.profile.phone
                SessionStateStore.setActiveUserKey(
                    SessionStateStore.makeUserKey(profileId: customer.id, email: customer.email)
                )
                addresses = customer.addressBook ?? []
            } else {
                addresses = []
            }
            if let selected = addresses.first(where: { $0.id == appState.address.selectedId }) ?? addresses.first {
                appState.address.selectedId = selected.id
                appState.address.display = selected.label ?? "Defina seu endereco"
                if let lat = selected.latLong?.first, let lng = selected.latLong?.dropFirst().first {
                    appState.address.latitude = lat
                    appState.address.longitude = lng
                }
                SessionStateStore.saveAddress(appState.address)
            }
        } catch {
            errorMessage = error.localizedDescription
        }

        isLoading = false
    }
}