Hashtags.swift

/*:
 # Monday Stretch Problem 5.1
 ## Hashtags
 ### Instructions - Hashtags
 - Build a `Restaurant` model object with `name`, `streetAddress`, `city`, `state`, and `reviews` properties.
 - Build a `Review` model object with a `username` and `text` property.
 - Instantiate an array of `Restaurant` and `Review` objects. Make sure that each `Restaurant` object holds an array of reviews. Add hashtags to some of your reviews or restaruant descriptions. (Use Yelp or Google to help you come up with `Restaurants` and `Reviews`).
 - Add a `hashtags` computed property to the `Restaurant` object that returns an array of any hashtags in the `Restaurant` or `Review`.
 `- Check your computed property by printing a list of hashtags of each review and restaurant.
 
 ### Instructions - Searching
 - Add a `SearchableObject` protocol with one function `matchesSearchTerm(searchTerm: String)`.
 - Implement the function on both model objects.
 - Demonstrate your search by printing a list of `Restaurants` that match a variety of search terms.
 */

import Foundation

protocol SearchableObject {
    func matchesSearchTerm(searchTerm: String) -> Bool
}

struct Restaurant: SearchableObject {
    let name: String
    let streetAddress: String
    let city: String
    let state: String
    let reviews: [Review]
    var hashtags: [String] {
        get {
            var hashtagCollector = [String]()
            
            reviews.forEach { hashtagCollector.append(contentsOf: $0.hashtags) }
            
            return hashtagCollector
        }
    }
    
    func matchesSearchTerm(searchTerm: String) -> Bool {
        let cleanSearchTerm = searchTerm.lowercased()
        
        for hashtag in hashtags where hashtag.lowercased() == cleanSearchTerm {
            return true
        }
        
        for review in reviews where review.matchesSearchTerm(searchTerm: cleanSearchTerm) {
            return true
        }
        
        return false
    }
}

struct Review: SearchableObject {
    let username: String
    let text: String
    var hashtags: [String] {
        get {
            let words = text.components(
                separatedBy: .whitespacesAndNewlines
            )

            return words.filter { $0.starts(with: "#") }
        }
    }
    
    func matchesSearchTerm(searchTerm: String) -> Bool {
        let cleanSearchTerm = searchTerm.lowercased()
        return text.contains(cleanSearchTerm) || hashtags.contains(cleanSearchTerm)
    }
}

let garrettReviewsCapriottis = Review(username: "beerguy", text: "dude, they forgot my order again! well, at least they gave me some free sandwich coupons I can use next time. #coupon #sandwich")

let capriottis = Restaurant(name: "Capriotti's", streetAddress: "123 Digital Dr.", city: "Lehi", state: "Utah", reviews: [garrettReviewsCapriottis, Review(username: "Dwight", text: "GET THE MEATBALL SUB #meatballs")])

let dwightAtChickFilA = Review(username: "Dwight", text: "too much sodium #LOSODIUM")

let chickFilA = Restaurant(name: "Chick-Fil-A", streetAddress: "134 Digital Dr.", city: "Lehi", state: "Utah", reviews: [Review(username: "Theo", text: "i love the app! #mobileorder #awesome"), Review(username: "Sean", text: "they gave me a free sandwich because I was waiting forever #awesome"), dwightAtChickFilA])

print(capriottis.hashtags) // ["#coupon", "#sandwich", "#meatballs"]
print(chickFilA.hashtags) // ["#mobileorder", "#awesome", "#awesome", "#LOSODIUM"]

print(chickFilA.matchesSearchTerm(searchTerm: "sandwich")) // true
print(chickFilA.matchesSearchTerm(searchTerm: "fruit")) // false
print(chickFilA.matchesSearchTerm(searchTerm: "#LOSODIUM")) // true
print(chickFilA.matchesSearchTerm(searchTerm: "#losodium")) // true
print(chickFilA.matchesSearchTerm(searchTerm: "#salad")) // false