import Foundation

enum InsufficientEnergy:Error {
    case crazyThursdayVMe50
}

class Entity {
    let ID, name: String
    init?(id ID: String, name: String) {
        self.ID = ID
        self.name = name
        let reFormula = try! NSRegularExpression(pattern: "^\\d{13}$", options: [NSRegularExpression.Options.anchorsMatchLines])
        let matchRange = NSRange(ID.startIndex..<ID.endIndex, in: ID)
        let matchList = reFormula.matches(in: ID, range: matchRange)
        if matchList.count != 1 {
            return nil
        }
    }
    convenience init(id ID: String) {
        self.init(id: ID, name: "Unknown")!
    }
}

class People: Entity {
    func work() throws -> Void {
        if Int.random(in: 1...7) == 7 {
            throw InsufficientEnergy.crazyThursdayVMe50
        }
    }
    
}

class Student: People {
    override init?(id ID: String, name: String){
        super.init(id: ID, name: name)
        let reFormula = try! NSRegularExpression(pattern: "^20\\d{2}[1-3]\\d{8}$", options: [NSRegularExpression.Options.anchorsMatchLines])
        let matchRange = NSRange(ID.startIndex..<ID.endIndex, in: ID)
        let matchList = reFormula.matches(in: ID, range: matchRange)
        if matchList.count != 1 {
            return nil
        }
    }
}

class Cat: Entity {
    override init?(id ID: String, name: String){
        super.init(id: ID, name: name)
        let reFormula = try! NSRegularExpression(pattern: "^20\\d{2}[1-3]\\d{8}$", options: [NSRegularExpression.Options.anchorsMatchLines])
        let matchRange = NSRange(ID.startIndex..<ID.endIndex, in: ID)
        let matchList = reFormula.matches(in: ID, range: matchRange)
        if matchList.count != 1 {
            return nil
        }
    }
}

// 以下的内容将能够判断名为 ID 的字符串是否满足13位数字，以20xx开头，第5位为1-3的情况，可以直接照搬
// let reFormula = try! NSRegularExpression(pattern: "^20\\d{2}[1-3]\\d{8}$", options: [NSRegularExpression.Options.anchorsMatchLines])
// let matchRange = NSRange(ID.startIndex..<ID.endIndex, in: ID)
// let matchList = reFormula.matches(in: ID, range: matchRange)
// if matchList.count != 1 {
//     return false
// }
// return true

// 以下的内容将能够判断名为 ID 的字符串是否满足13位数字的情况，可以直接照搬
// let reFormula = try! NSRegularExpression(pattern: "^\\d{13}$", options: [NSRegularExpression.Options.anchorsMatchLines])
// let matchRange = NSRange(ID.startIndex..<ID.endIndex, in: ID)
// let matchList = reFormula.matches(in: ID, range: matchRange)
// if matchList.count != 1 {
//     return false
// }
// return true

// 以下的内容将能够判断名为 ID 的字符串是否满足13位数字，开头为0000的情况，可以直接照搬
// let reFormula = try! NSRegularExpression(pattern: "^0000\\d{9}$", options: [NSRegularExpression.Options.anchorsMatchLines])
// let matchRange = NSRange(ID.startIndex..<ID.endIndex, in: ID)
// let matchList = reFormula.matches(in: ID, range: matchRange)
// if matchList.count != 1 {
//     return false
// }
// return true

var siuziu = Student(id: "2022202121000", name: "小趙")
var siuchow = Student(id: "2000503205613", name: "小周")
var studentList = [siuziu, siuchow]

for item in studentList {
    guard item != nil else {
        print("Invalid students")
        continue
    }
    do {
        var count = 0
        while true{
            count += 1
            try item!.work()
            print("Siu Ziu has worked for \(String(count)) \(count <= 1 ? "hour" : "hours").")
        }
    }
    catch InsufficientEnergy.crazyThursdayVMe50 {
        print("I'm hungry, please v me 50!")
    }
}