struct Instruction {
    number: Int
    text: String
    videos: [VideoURL]
    allowsRecording: Bool
    time: TimeInterval?
}

struct Ingredient {
    quantity: Int
    unit: String
    name: String
    other: String?
    comment: String?
    input: String
}

enum RecipeTag {
    vegan, vege, halal, pescatarian...
}

struct Recipe {
    source: URL
    instructions: [Instruction]
    ingredients: [Ingredient]
    photo: Image?
    time: TimeInterval?
    tags: [RecipeTag]
    servings: Int? // if doesn't exist, assume 1 serving
    difficulty: Double // percentage???
}

struct User {
    name: String
    username: String
    email: String
    password: String
    recipes: [Recipe]
    experience: Double // percentage
}