import Foundation

// MARK: - Unified bank data models
// These aggregate MIB, BML, and Fahipay responses into a common schema.
// All types are Codable for cache serialisation and Hashable for use in SwiftUI ForEach.

struct BankAccount: Identifiable, Codable, Hashable {
    let id: String               // Synthetic: "\(bank)_\(accountNumber)_\(loginTag)"
    let bank: String             // "MIB" | "BML" | "FAHIPAY"
    let profileName: String
    let profileType: String
    let productCode: String
    let accountNumber: String
    let accountBriefName: String
    let currencyName: String     // "MVR" | "USD" | ...
    let accountTypeName: String
    let availableBalance: Double
    let currentBalance: Double
    let blockedAmount: Double
    let mvrBalance: Double?      // Converted balance when currency != MVR
    let statusDesc: String
    let profileImageHash: String?
    let loginTag: String         // loginId that owns this account
    let profileId: String?
    let internalId: String?

    var isActive: Bool {
        statusDesc.lowercased().contains("active")
    }

    var formattedAvailableBalance: String {
        "\(currencyName) \(Self.balanceFormatter.string(from: NSNumber(value: availableBalance)) ?? "0.00")"
    }

    private static let balanceFormatter: NumberFormatter = {
        let f = NumberFormatter()
        f.numberStyle = .decimal
        f.minimumFractionDigits = 2
        f.maximumFractionDigits = 2
        return f
    }()
}

struct BankContact: Identifiable, Codable, Hashable {
    let id: String               // Unique composite across banks
    let benefNo: String
    let benefName: String
    let benefNickName: String?
    let benefAccount: String
    let benefType: String        // "MIB" | "LOCAL" | "SWIFT" | "BML" | "FAHIPAY"
    let bankColor: String?
    let benefBankName: String?
    let bankCode: String?
    let benefStatus: String
    let transferCyDesc: String?
    let customerImgHash: String?
    let benefCategoryId: String?
    let profileId: String?
    let source: String           // "MIB" | "BML" | "FAHIPAY"

    var displayName: String {
        if let nick = benefNickName, !nick.isEmpty { return nick }
        return benefName
    }
}

struct BankTransaction: Identifiable, Codable, Hashable {
    let id: String
    let date: Date
    let description: String
    let amount: Double           // Positive = credit, negative = debit
    let currency: String
    let counterpartyName: String?
    let reference: String?
    let accountNumber: String
    let accountDisplayName: String
    let source: String           // "MIB" | "BML" | "BML_CARD" | "FAHIPAY"
    let iconUrl: String?

    var isCredit: Bool { amount >= 0 }

    var formattedAmount: String {
        let sign = isCredit ? "+" : "-"
        let abs = Self.amountFormatter.string(from: NSNumber(value: Swift.abs(amount))) ?? "0.00"
        return "\(sign) \(currency) \(abs)"
    }

    private static let amountFormatter: NumberFormatter = {
        let f = NumberFormatter()
        f.numberStyle = .decimal
        f.minimumFractionDigits = 2
        f.maximumFractionDigits = 2
        return f
    }()
}

struct BankContactCategory: Identifiable, Codable, Hashable {
    let id: String
    let categoryName: String
    let numBenef: Int
    let source: String           // "MIB" | "FAHIPAY"
}

struct BankNotification: Identifiable, Codable, Hashable {
    let id: String
    let title: String
    let body: String
    let date: Date
    var isRead: Bool
    let source: String
}

// MARK: - Transfer

struct TransferResult: Codable {
    let success: Bool
    let transactionId: String?
    let reference: String?
    let date: Date?
    let errorMessage: String?
}

struct TransferReceiptData: Sendable, Equatable {
    let fromAccountNumber: String
    let fromBankName: String
    let toAccountNumber: String
    let toAccountName: String
    let amount: Double
    let currency: String
    let reference: String
    let date: String
    let message: String
}

struct RecentPick: Identifiable, Codable, Hashable {
    let id: String
    let benefName: String
    let benefAccount: String
    let transferNetwork: String  // TransferNetwork.rawValue
    let bankName: String?
    let lastUsed: Date
}

// MARK: - Connectivity

enum ConnectivityError: String, CaseIterable, Codable {
    case noInternet = "NO_INTERNET"
    case mib        = "MIB"
    case bml        = "BML"
    case fahipay    = "FAHIPAY"
}