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1 //
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2 // GameProtocol.swift
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3 // GeoQuiz
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4 //
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5 // Created by Dennis Concepción Martín on 18/9/22.
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6 //
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7
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8 import Foundation
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9 import SwiftUI
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10 import AVFAudio
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11
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12 protocol Game: ObservableObject {
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13
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14 // Define generic type
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15 associatedtype T: Equatable
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16
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17 // Game
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18 var data: [String: T] { get set}
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19 var dataAsked: [String: T] { get set }
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20 var correctAnswer: (key: String, value: T) { get set }
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21
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22 // User
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23 var userChoices: [String: T] { get set }
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24 var userScore: Int { get set }
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25 var userLives: Int { get set }
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26 var correctAnswers: [String: T] { get set }
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27 var wrongAnswers: [String: T] { get set }
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28
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29 // Alerts
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30 var alertTitle: String { get set }
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31 var alertMessage: String { get set }
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32 var showingNoLivesAlert: Bool { get set }
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33 var showingEndGameAlert: Bool { get set }
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34 var showingWrongAnswerAlert: Bool { get set }
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35 var showingExitGameAlert: Bool { get set }
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36
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37 // Animations
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38 var scoreScaleAmount: Double { get set }
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39 var livesScaleAmount: Double { get set }
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40
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41 // Modal views
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42 var showingBuyLivesView: Bool { get set }
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43 var showingGameStatsView: Bool { get set }
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44
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45 // Sound effects
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46 var player: AVAudioPlayer? { get set }
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47 }
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48
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49 extension Game {
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50 var questionCounter: Int {
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51 dataAsked.count
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52 }
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53
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54 func askQuestion() {
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55 guard questionCounter < data.count else {
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56 alertTitle = "Amazing!"
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57 alertMessage = "You've completed the game."
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58 showingEndGameAlert = true
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59
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60 return
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61 }
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62
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63 // Get random choices
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64 var userChoices = [String: T]()
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65
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66 while userChoices.count < 2 {
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67 if let choice = data.randomElement() {
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68 userChoices[choice.key] = choice.value
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69 } else {
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70 fatalError("Couldn't get a random value from data")
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71 }
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72 }
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73
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74 // Get question asked (correct answer)
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75 let correctAnswer = data.first(where: {
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76 !userChoices.keys.contains($0.key) && !dataAsked.keys.contains($0.key)
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77 })
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78
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79 // Unwrap optional
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80 if let correctAnswer = correctAnswer {
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81 userChoices[correctAnswer.key] = correctAnswer.value
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82 dataAsked[correctAnswer.key] = correctAnswer.value
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83 self.correctAnswer = correctAnswer
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84 } else {
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85 fatalError("Couldn't unwrap optional value")
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86 }
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87
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88 self.userChoices = userChoices
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89 }
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90
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91 func answer(_ choice: (key: String, value: T)) {
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92 guard userLives > 0 else {
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93 alertTitle = "Not enough lives!"
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94 alertMessage = "Please buy more lives to keep playing"
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95 showingNoLivesAlert = true
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96
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97 return
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98 }
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99
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100 if correctAnswer == choice {
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101 hapticSuccess()
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102 playSound("correctAnswer")
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103
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104 withAnimation(.easeIn(duration: 0.5)) {
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105 scoreScaleAmount += 1
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106 userScore += 1
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107 }
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108
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109 correctAnswers[correctAnswer.key] = correctAnswer.value
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110 askQuestion()
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111 } else {
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112 hapticError()
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113 playSound("wrongAnswer")
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114
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115 withAnimation(.easeIn(duration: 0.5)) {
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116 livesScaleAmount += 1
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117 userLives -= 1
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118 }
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119
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120 alertTitle = "Wrong!"
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121 alertMessage = "You have \(userLives) lives left"
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122 showingWrongAnswerAlert = true
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123
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124 wrongAnswers[choice.key] = choice.value
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125 }
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126
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127 DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [self] in
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128 withAnimation(.easeIn(duration: 0.5)) {
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129 scoreScaleAmount = 1
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130 livesScaleAmount = 1
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131 }
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132 }
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133 }
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134
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135 private func playSound(_ filename: String) {
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136 guard let soundFileURL = Bundle.main.url(forResource: filename, withExtension: "wav") else {
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137 fatalError("Sound file \(filename) couldn't be found")
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138 }
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139
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140 do {
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141 try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.ambient)
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142 try AVAudioSession.sharedInstance().setActive(true)
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143 } catch {
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144 fatalError("Couldn't activate session")
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145 }
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146
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147 do {
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148 player = try AVAudioPlayer(contentsOf: soundFileURL)
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149 player?.play()
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150 } catch {
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151 fatalError("Couldn't play sound effect")
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152 }
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153 }
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154 }
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