import SwiftUI

struct EditSavingsCategoryView: View {
    @Binding var isPresented: Bool
    @EnvironmentObject var authManager: AuthManager
    let category: SavingsCategory
    let onSaved: () async -> Void

    @State private var name: String
    @State private var isDeposit: Bool
    @State private var isRecurring: Bool
    @State private var isAccount: Bool
    @State private var recurringAmount: String
    @State private var interestRate: String
    @State private var isLoading = false
    @State private var showCloseConfirm = false

    init(isPresented: Binding<Bool>, category: SavingsCategory, onSaved: @escaping () async -> Void) {
        self._isPresented = isPresented
        self.category = category
        self.onSaved = onSaved
        self._name = State(initialValue: category.name)
        self._isDeposit = State(initialValue: category.isDeposit == true)
        self._isRecurring = State(initialValue: category.isRecurring == true)
        self._isAccount = State(initialValue: category.isAccount == true)
        let ra = category.recurringAmount
        self._recurringAmount = State(initialValue: ra != nil ? String(format: "%.0f", ra!) : "")
        let ir = category.interestRate
        self._interestRate = State(initialValue: ir != nil ? String(format: "%.1f", ir!) : "")
    }

    var body: some View {
        ZStack {
            Color(hex: "0a0a1a").ignoresSafeArea()
            VStack(spacing: 0) {
                RoundedRectangle(cornerRadius: 3).fill(Color.white.opacity(0.2)).frame(width: 40, height: 4).padding(.top, 12)
                HStack {
                    Button("Отмена") { isPresented = false }.foregroundColor(Color(hex: "8888aa"))
                    Spacer()
                    Text("Редактировать категорию").font(.headline).foregroundColor(.white)
                    Spacer()
                    Button(action: save) {
                        if isLoading { ProgressView().tint(Color(hex: "0D9488")).scaleEffect(0.8) }
                        else { Text("Сохранить").foregroundColor(name.isEmpty ? Color(hex: "8888aa") : Color(hex: "0D9488")).fontWeight(.semibold) }
                    }.disabled(name.isEmpty || isLoading)
                }
                .padding(.horizontal, 20).padding(.vertical, 16)
                Divider().background(Color.white.opacity(0.1))
                ScrollView {
                    VStack(spacing: 16) {
                        fieldLabel("Название") {
                            TextField("Например: На машину", text: $name)
                                .foregroundColor(.white).padding(14)
                                .background(RoundedRectangle(cornerRadius: 12).fill(Color.white.opacity(0.07)))
                        }
                        VStack(alignment: .leading, spacing: 8) {
                            Label("Тип", systemImage: "tag.fill").font(.caption).foregroundColor(Color(hex: "8888aa"))
                            HStack(spacing: 8) {
                                TypeButton(label: "💰 Накопление", selected: !isDeposit && !isRecurring && !isAccount) { isDeposit = false; isRecurring = false; isAccount = false }
                                TypeButton(label: "🏦 Вклад", selected: isDeposit) { isDeposit = true; isRecurring = false; isAccount = false }
                            }
                            HStack(spacing: 8) {
                                TypeButton(label: "🔄 Регулярные", selected: isRecurring) { isDeposit = false; isRecurring = true; isAccount = false }
                                TypeButton(label: "🏧 Счёт", selected: isAccount) { isDeposit = false; isRecurring = false; isAccount = true }
                            }
                        }
                        if isRecurring {
                            fieldLabel("Сумма / мес. (₽)") {
                                TextField("0", text: $recurringAmount).keyboardType(.decimalPad)
                                    .foregroundColor(.white).padding(14)
                                    .background(RoundedRectangle(cornerRadius: 12).fill(Color.white.opacity(0.07)))
                            }
                        }
                        if isDeposit {
                            fieldLabel("Ставка (%)") {
                                TextField("0.0", text: $interestRate).keyboardType(.decimalPad)
                                    .foregroundColor(.white).padding(14)
                                    .background(RoundedRectangle(cornerRadius: 12).fill(Color.white.opacity(0.07)))
                            }
                        }

                        // Close / Restore
                        Button(action: { showCloseConfirm = true }) {
                            HStack {
                                Image(systemName: category.isClosed == true ? "arrow.uturn.backward" : "checkmark.seal")
                                Text(category.isClosed == true ? "Восстановить" : "Закрыть категорию")
                            }
                            .foregroundColor(category.isClosed == true ? Color(hex: "0D9488") : Color(hex: "ff4757"))
                            .frame(maxWidth: .infinity).padding(14)
                            .background(RoundedRectangle(cornerRadius: 12).fill(Color.white.opacity(0.05)))
                        }
                    }.padding(20)
                }
            }
        }
        .confirmationDialog(
            category.isClosed == true ? "Восстановить категорию?" : "Закрыть категорию?",
            isPresented: $showCloseConfirm,
            titleVisibility: .visible
        ) {
            Button(category.isClosed == true ? "Восстановить" : "Закрыть",
                   role: category.isClosed == true ? .none : .destructive) {
                Task { await toggleClose() }
            }
            Button("Отмена", role: .cancel) {}
        }
    }

    @ViewBuilder func fieldLabel<Content: View>(_ label: String, @ViewBuilder content: () -> Content) -> some View {
        VStack(alignment: .leading, spacing: 8) {
            Label(label, systemImage: "pencil").font(.caption).foregroundColor(Color(hex: "8888aa"))
            content()
        }
    }

    func save() {
        isLoading = true
        Task {
            var params: [String: Any] = ["name": name, "is_deposit": isDeposit, "is_recurring": isRecurring, "is_account": isAccount]
            if isRecurring, let a = Double(recurringAmount) { params["recurring_amount"] = a }
            if isDeposit, let r = Double(interestRate) { params["interest_rate"] = r }
            if let body = try? JSONSerialization.data(withJSONObject: params) {
                try? await APIService.shared.updateSavingsCategory(token: authManager.token, id: category.id, body: body)
            }
            await onSaved()
            await MainActor.run { isPresented = false }
        }
    }

    func toggleClose() async {
        let params: [String: Any] = ["is_closed": !(category.isClosed == true)]
        if let body = try? JSONSerialization.data(withJSONObject: params) {
            try? await APIService.shared.updateSavingsCategory(token: authManager.token, id: category.id, body: body)
        }
        await onSaved()
        await MainActor.run { isPresented = false }
    }
}