import Foundation

// MARK: - FinanceTransaction

struct FinanceTransaction: Codable, Identifiable {
    let id: Int
    var amount: Double
    var categoryId: Int?
    var description: String?
    var type: String // "income" or "expense"
    var date: String?
    var createdAt: String?

    var isIncome: Bool { type == "income" }

    var dateFormatted: String {
        guard let d = date else { return "" }
        let parts = String(d.prefix(10)).split(separator: "-")
        guard parts.count == 3 else { return String(d.prefix(10)) }
        return "\(parts[2]).\(parts[1]).\(parts[0])"
    }

    var dateOnly: String { String(date?.prefix(10) ?? "") }

    enum CodingKeys: String, CodingKey {
        case id, amount, description, type, date
        case categoryId = "category_id"
        case createdAt = "created_at"
    }
}

// MARK: - FinanceCategory

struct FinanceCategory: Codable, Identifiable {
    let id: Int
    var name: String
    var icon: String?
    var color: String?
    var type: String
}

// MARK: - FinanceSummary

struct FinanceSummary: Codable {
    var totalIncome: Double?
    var totalExpense: Double?
    var balance: Double?
    var carriedOver: Double?
    var month: String?
    var byCategory: [CategorySpend]?
    var daily: [DailySpend]?

    enum CodingKeys: String, CodingKey {
        case balance, month
        case totalIncome = "total_income"
        case totalExpense = "total_expense"
        case carriedOver = "carried_over"
        case byCategory = "by_category"
        case daily
    }
}

struct CategorySpend: Codable, Identifiable {
    var id: Int { categoryId ?? 0 }
    var categoryId: Int?
    var categoryName: String?
    var total: Double?
    var icon: String?
    var color: String?

    enum CodingKeys: String, CodingKey {
        case total, icon, color
        case categoryId = "category_id"
        case categoryName = "category_name"
    }
}

struct DailySpend: Codable, Identifiable {
    var id: String { date }
    let date: String
    let total: Double?
    let income: Double?
    let expense: Double?
}

// MARK: - FinanceAnalytics

struct FinanceAnalytics: Codable {
    var currentMonth: FinanceSummary?
    var previousMonth: FinanceSummary?
    var byCategory: [CategorySpend]?

    enum CodingKeys: String, CodingKey {
        case currentMonth = "current_month"
        case previousMonth = "previous_month"
        case byCategory = "by_category"
    }
}

// MARK: - CreateTransactionRequest

struct CreateTransactionRequest: Codable {
    var amount: Double
    var categoryId: Int?
    var description: String?
    var type: String
    var date: String?

    enum CodingKeys: String, CodingKey {
        case amount, description, type, date
        case categoryId = "category_id"
    }
}