import Foundation

struct Alternative: Identifiable {
    let id: Int
    let product: Product
    let price: Double?
    let distance: Double?       // miles from user
    let deliveryUrl: String?
    let pickupUrl: String?
    let buyUrl: String?
    let isSponsored: Bool

    init(json: [String: Any]) {
        id = JSON.parseInt(json["id"] ?? json["alternativeId"])

        if let productData = json["product"] as? [String: Any] {
            product = Product(json: productData)
        } else {
            // Product data might be at the root level
            product = Product(json: json)
        }

        if let p = json["price"] as? Double, p > 0 {
            price = p
        } else if let p = json["Price"] as? Double, p > 0 {
            price = p
        } else {
            price = nil
        }

        if let d = json["distance"] as? Double, d > 0 {
            distance = d
        } else if let d = json["Distance"] as? Double, d > 0 {
            distance = d
        } else {
            distance = nil
        }

        deliveryUrl = JSON.parseOptionalString(json["deliveryUrl"] ?? json["DeliveryUrl"])
        pickupUrl = JSON.parseOptionalString(json["pickupUrl"] ?? json["PickupUrl"])
        buyUrl = JSON.parseOptionalString(json["buyUrl"] ?? json["BuyUrl"])
        isSponsored = JSON.parseBool(json["isSponsored"] ?? json["IsSponsored"] ?? json["sponsored"])
    }

    init(
        id: Int,
        product: Product,
        price: Double? = nil,
        distance: Double? = nil,
        deliveryUrl: String? = nil,
        pickupUrl: String? = nil,
        buyUrl: String? = nil,
        isSponsored: Bool = false
    ) {
        self.id = id
        self.product = product
        self.price = price
        self.distance = distance
        self.deliveryUrl = deliveryUrl
        self.pickupUrl = pickupUrl
        self.buyUrl = buyUrl
        self.isSponsored = isSponsored
    }

    // MARK: - Computed Properties
    var hasDelivery: Bool { deliveryUrl != nil }
    var hasPickup: Bool { pickupUrl != nil }
    var hasBuyLink: Bool { buyUrl != nil }

    var formattedPrice: String? {
        guard let price = price else { return nil }
        return String(format: "$%.2f", price)
    }

    var formattedDistance: String? {
        guard let distance = distance else { return nil }
        if distance < 0.1 {
            return "Nearby"
        } else if distance < 1 {
            return String(format: "%.1f mi", distance)
        } else {
            return String(format: "%.0f mi", distance)
        }
    }
}