import SwiftUI

struct OverviewTab: View {
    @ObservedObject var vm: HomeViewModel
    let onCreateQr: () -> Void
    let onSeePayments: () -> Void
    let onOpenWallet: () -> Void

    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 16) {
                let firstName = SessionStore.shared.name?
                    .trimmingCharacters(in: .whitespaces)
                    .split(separator: " ").first.map(String.init)

                Text(firstName.map { "Hello, \($0)" } ?? "Hello")
                    .font(.ladill(size: 22, weight: .semibold))
                    .foregroundStyle(LadillColors.ink)
                Text("Here is today's takings, your payment QRs, and recent payments.")
                    .font(.ladill(size: 14))
                    .foregroundStyle(LadillColors.muted)

                if vm.hasPayout == false {
                    payoutNote
                }

                switch vm.overviewState {
                case .idle, .loading:
                    LoadingView()
                        .task { await vm.loadOverview() }
                case .failure(let message):
                    ErrorView(message: message) { Task { await vm.loadOverview() } }
                case .success(let data):
                    overviewContent(data)
                }
            }
            .padding(20)
        }
        .refreshable { await vm.refreshOverview() }
    }

    private var payoutNote: some View {
        Button(action: onOpenWallet) {
            HStack {
                Image(systemName: "exclamationmark.circle.fill")
                    .foregroundStyle(LadillColors.indigo)
                Text("Set up your payout account to withdraw takings.")
                    .font(.ladill(size: 13))
                    .foregroundStyle(LadillColors.indigoText)
                Spacer()
            }
            .padding(14)
            .background(LadillColors.indigoSoft)
            .clipShape(RoundedRectangle(cornerRadius: 14))
        }
        .buttonStyle(.plain)
    }

    @ViewBuilder
    private func overviewContent(_ data: Overview) -> some View {
        let currency = data.currency ?? "GHS"
        HStack(spacing: 12) {
            StatCard(label: "Today", value: Formatters.money(minor: data.todayTakingsMinor ?? 0, currency: currency), accent: true)
            StatCard(label: "Payments", value: "\(data.todayCount ?? 0)")
        }
        HStack(spacing: 12) {
            StatCard(label: "Payment QRs", value: "\(data.paymentQrCount ?? 0)")
            StatCard(label: "Wallet", value: Formatters.money(minor: data.walletBalanceMinor ?? 0, currency: currency))
        }

        LadillButton(title: "Create payment QR", action: onCreateQr)
            .padding(.top, 4)

        if let payments = data.recentPayments, !payments.isEmpty {
            HStack {
                Text("Recent payments")
                    .font(.ladill(size: 16, weight: .semibold))
                Spacer()
                Button("See all", action: onSeePayments)
                    .font(.ladill(size: 13, weight: .semibold))
                    .foregroundStyle(LadillColors.indigo)
            }
            .padding(.top, 8)

            ForEach(payments) { payment in
                paymentRow(payment)
            }
        }
    }

    private func paymentRow(_ payment: Payment) -> some View {
        LadillCard {
            HStack {
                VStack(alignment: .leading, spacing: 4) {
                    Text(payment.payerName ?? payment.qrLabel ?? "Payment")
                        .font(.ladill(size: 15, weight: .semibold))
                    Text(Formatters.date(iso: payment.paidAt ?? payment.createdAt))
                        .font(.ladill(size: 12))
                        .foregroundStyle(LadillColors.muted)
                }
                Spacer()
                Text(Formatters.money(minor: payment.amountMinor ?? 0, currency: payment.currency ?? "GHS"))
                    .font(.ladill(size: 15, weight: .semibold))
                    .foregroundStyle(LadillColors.money)
            }
        }
    }
}

struct PaymentQrsTab: View {
    @ObservedObject var vm: HomeViewModel
    let onCreateQr: () -> Void
    let onOpenQr: (Int64) -> Void

    var body: some View {
        ScrollView {
            VStack(spacing: 12) {
                LadillButton(title: "Create payment QR", action: onCreateQr)

                switch vm.qrsState {
                case .idle, .loading:
                    LoadingView().task { await vm.loadQrs() }
                case .failure(let message):
                    ErrorView(message: message) { Task { await vm.loadQrs() } }
                case .success(let qrs):
                    if qrs.isEmpty {
                        Text("No payment QRs yet. Create one to start collecting.")
                            .font(.ladill(size: 14))
                            .foregroundStyle(LadillColors.muted)
                            .multilineTextAlignment(.center)
                            .padding(.vertical, 40)
                    } else {
                        ForEach(qrs) { qr in
                            Button { onOpenQr(qr.id) } label: {
                                LadillCard {
                                    HStack {
                                        Image(systemName: "qrcode")
                                            .font(.system(size: 28))
                                            .foregroundStyle(LadillColors.indigo)
                                        VStack(alignment: .leading, spacing: 4) {
                                            Text(qr.label)
                                                .font(.ladill(size: 15, weight: .semibold))
                                                .foregroundStyle(LadillColors.ink)
                                            Text(qr.businessName ?? "")
                                                .font(.ladill(size: 12))
                                                .foregroundStyle(LadillColors.muted)
                                        }
                                        Spacer()
                                        if qr.isActive == false {
                                            Text("Paused")
                                                .font(.ladill(size: 11, weight: .medium))
                                                .foregroundStyle(LadillColors.muted)
                                        }
                                    }
                                }
                            }
                            .buttonStyle(.plain)
                        }
                    }
                }
            }
            .padding(20)
        }
        .refreshable { await vm.loadQrs() }
    }
}

struct PaymentsTab: View {
    @ObservedObject var vm: HomeViewModel

    var body: some View {
        ScrollView {
            VStack(spacing: 12) {
                switch vm.paymentsState {
                case .idle, .loading:
                    LoadingView().task { await vm.loadPayments() }
                case .failure(let message):
                    ErrorView(message: message) { Task { await vm.loadPayments() } }
                case .success(let payments):
                    if payments.isEmpty {
                        Text("No payments yet.")
                            .font(.ladill(size: 14))
                            .foregroundStyle(LadillColors.muted)
                            .padding(.vertical, 40)
                    } else {
                        ForEach(payments) { payment in
                            LadillCard {
                                HStack {
                                    VStack(alignment: .leading, spacing: 4) {
                                        Text(payment.payerName ?? payment.qrLabel ?? "Payment")
                                            .font(.ladill(size: 15, weight: .semibold))
                                        Text(Formatters.date(iso: payment.paidAt ?? payment.createdAt))
                                            .font(.ladill(size: 12))
                                            .foregroundStyle(LadillColors.muted)
                                    }
                                    Spacer()
                                    Text(Formatters.money(minor: payment.amountMinor ?? 0, currency: payment.currency ?? "GHS"))
                                        .font(.ladill(size: 15, weight: .semibold))
                                        .foregroundStyle(LadillColors.money)
                                }
                            }
                        }
                    }
                }
            }
            .padding(20)
        }
        .refreshable { await vm.loadPayments() }
    }
}

struct PayoutsTab: View {
    @ObservedObject var vm: HomeViewModel
    let onOpenWallet: () -> Void

    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 16) {
                Text("Payouts")
                    .font(.ladill(size: 22, weight: .semibold))
                Text("Takings settle into your Ladill wallet (5% fee), then withdraw to bank or MoMo.")
                    .font(.ladill(size: 14))
                    .foregroundStyle(LadillColors.muted)

                switch vm.payoutsState {
                case .idle, .loading:
                    LoadingView().task { await vm.loadPayouts() }
                case .failure(let message):
                    ErrorView(message: message) { Task { await vm.loadPayouts() } }
                case .success(let data):
                    let currency = data.currency ?? "GHS"
                    StatCard(label: "Total revenue", value: Formatters.money(minor: data.totalRevenueMinor ?? 0, currency: currency), accent: true)
                    StatCard(label: "Wallet balance", value: Formatters.money(minor: data.walletBalanceMinor ?? 0, currency: currency))
                }

                LadillButton(title: "Open wallet", action: onOpenWallet)
            }
            .padding(20)
        }
        .refreshable { await vm.loadPayouts() }
    }
}