From 25357995056bbe6299e5c8fddf7170e449447c7f Mon Sep 17 00:00:00 2001
From: Jordan Orelli <jordanorelli@gmail.com>
Date: Sun, 1 Oct 2023 15:57:55 -0500
Subject: [PATCH] a full game loop appears

---
 Cargo.lock        | 37 ++++++++++++++++++++++++++++
 Cargo.toml        |  1 +
 src/events.rs     |  4 +++
 src/game.rs       | 34 ++++++++++++++++++++++++++
 src/play.rs       | 62 ++++++++++++++++++++++++++++++++++++++++++++---
 src/start_menu.rs | 23 +++++++++++++++---
 6 files changed, 155 insertions(+), 6 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index f63b6dc..2a5a79d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2812,6 +2812,12 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
 [[package]]
 name = "pretty-type-name"
 version = "1.0.1"
@@ -2858,6 +2864,36 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "17fd96390ed3feda12e1dfe2645ed587e0bea749e319333f104a33ff62f77a0b"
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "range-alloc"
 version = "0.1.3"
@@ -2963,6 +2999,7 @@ version = "0.1.0"
 dependencies = [
  "bevy",
  "bevy-inspector-egui",
+ "rand",
  "tracing",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 18fbedd..46b1ca1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,4 +17,5 @@ edition = "2021"
 [dependencies]
 bevy = { version = "0.11.2", features = [ ] }
 bevy-inspector-egui = "0.19.0"
+rand = "0.8.5"
 tracing = "0.1.37"
diff --git a/src/events.rs b/src/events.rs
index 9a8bec0..c511e15 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -4,6 +4,9 @@ use bevy::prelude::*;
 #[derive(Event, Default, Debug)]
 pub(crate) struct Play;
 
+#[derive(Event, Default, Debug)]
+pub(crate) struct GameFinished;
+
 #[derive(Event)]
 pub(crate) struct PlayerMove {
     throw: Throw,
@@ -14,5 +17,6 @@ pub(crate) struct Events {}
 impl Plugin for Events {
     fn build(&self, app: &mut App) {
         app.add_event::<Play>();
+        app.add_event::<GameFinished>();
     }
 }
diff --git a/src/game.rs b/src/game.rs
index 0efcf5f..2f74f10 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,4 +1,5 @@
 use bevy::prelude::*;
+use rand::Rng;
 use tracing::info;
 
 use crate::{events::Events, play::Play, start_menu::StartMenu};
@@ -25,3 +26,36 @@ pub(crate) enum Throw {
     Paper,
     Scissors,
 }
+
+impl Throw {
+    pub fn random() -> Self {
+        let mut rng = rand::thread_rng();
+        match rng.gen_range(0..3) {
+            0 => Throw::Rock,
+            1 => Throw::Paper,
+            2 => Throw::Scissors,
+            _ => unreachable!(),
+        }
+    }
+
+    pub fn against(&self, other: &Self) -> Outcome {
+        match (self, other) {
+            (Throw::Rock, Throw::Rock)
+            | (Throw::Paper, Throw::Paper)
+            | (Throw::Scissors, Throw::Scissors) => Outcome::Tie,
+            (Throw::Rock, Throw::Scissors)
+            | (Throw::Paper, Throw::Rock)
+            | (Throw::Scissors, Throw::Paper) => Outcome::Win,
+            (Throw::Rock, Throw::Paper)
+            | (Throw::Paper, Throw::Scissors)
+            | (Throw::Scissors, Throw::Rock) => Outcome::Loss,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub(crate) enum Outcome {
+    Win,
+    Loss,
+    Tie,
+}
diff --git a/src/play.rs b/src/play.rs
index 9a38a8f..f94296f 100644
--- a/src/play.rs
+++ b/src/play.rs
@@ -2,9 +2,11 @@ use crate::{events, game::Throw, ui};
 use bevy::ecs::system::EntityCommand;
 use bevy::prelude::*;
 use bevy::text::DEFAULT_FONT_HANDLE;
-use bevy::time::Stopwatch;
 use std::time::Duration;
 
+#[derive(Component)]
+struct PlayContainer;
+
 #[derive(Debug)]
 pub enum Phase {
     BeforePlay,
@@ -28,6 +30,11 @@ impl Board {
             p2_throw: None,
         }
     }
+
+    pub fn clear(&mut self) {
+        self.p1_throw = None;
+        self.p2_throw = None;
+    }
 }
 
 pub struct Play {}
@@ -42,7 +49,11 @@ struct Action {
     throw: Throw,
 }
 
-fn advance_game_state(time: Res<Time>, mut board: ResMut<Board>) {
+fn advance_game_state(
+    time: Res<Time>,
+    mut board: ResMut<Board>,
+    mut finished: EventWriter<events::GameFinished>,
+) {
     // add some stuff here
     match &mut board.phase {
         Phase::BeforePlay => {}
@@ -50,7 +61,23 @@ fn advance_game_state(time: Res<Time>, mut board: ResMut<Board>) {
             timer.tick(time.delta());
             if timer.just_finished() {
                 info!("Countdown timer finished");
+                if board.p1_throw.is_none() {
+                    info!("Player panics and throws at random");
+                    board.p1_throw = Some(Throw::random());
+                }
+                board.p2_throw = Some(Throw::random());
+
                 board.phase = Phase::Reveal(Timer::new(Duration::from_secs(3), TimerMode::Once));
+                info!("Player threw: {throw:?}", throw = board.p1_throw);
+                info!("Computer threw: {throw:?}", throw = board.p2_throw);
+                info!(
+                    "Outcome: {outcome:?}",
+                    outcome = board
+                        .p1_throw
+                        .as_ref()
+                        .unwrap()
+                        .against(board.p2_throw.as_ref().unwrap())
+                );
             }
         }
         Phase::Reveal(timer) => {
@@ -58,6 +85,7 @@ fn advance_game_state(time: Res<Time>, mut board: ResMut<Board>) {
             if timer.just_finished() {
                 info!("Reveal timer finished");
                 board.phase = Phase::AfterPlay;
+                finished.send_default();
             }
         }
         Phase::AfterPlay => {}
@@ -71,6 +99,10 @@ fn handle_actions(
     for (interaction, action) in actions.iter() {
         if matches!(interaction, Interaction::Pressed) {
             info!("Clicked {throw:?}", throw = action.throw);
+            if !matches!(board.phase, Phase::Countdown(_)) {
+                info!("Ignoring player throw");
+                return;
+            }
             if board.p1_throw.is_some() {
                 info!("Replacing existing throw");
             }
@@ -147,6 +179,20 @@ fn header() -> impl Bundle {
     )
 }
 
+fn handle_game_finished(
+    mut events: EventReader<events::GameFinished>,
+    mut commands: Commands,
+    q: Query<Entity, With<PlayContainer>>,
+) {
+    if events.is_empty() {
+        return;
+    }
+    events.clear();
+    for e in q.iter() {
+        commands.entity(e).despawn_recursive();
+    }
+}
+
 fn handle_play(
     mut events: EventReader<events::Play>,
     mut commands: Commands,
@@ -160,10 +206,12 @@ fn handle_play(
         info!("play event {e:?}");
     }
     board.phase = Phase::Countdown(Timer::new(Duration::from_millis(3000), TimerMode::Once));
+    board.clear();
     info!("Starting countdown");
 
     let mut bg = commands.spawn((
         Name::new("Play Container"),
+        PlayContainer {},
         NodeBundle {
             style: Style {
                 display: Display::Flex,
@@ -235,7 +283,15 @@ fn handle_play(
 
 impl Plugin for Play {
     fn build(&self, app: &mut App) {
-        app.add_systems(Update, (handle_play, handle_actions, advance_game_state));
+        app.add_systems(
+            Update,
+            (
+                handle_play,
+                handle_actions,
+                advance_game_state,
+                handle_game_finished,
+            ),
+        );
         app.insert_resource(Board::new());
     }
 }
diff --git a/src/start_menu.rs b/src/start_menu.rs
index bc9463c..887febf 100644
--- a/src/start_menu.rs
+++ b/src/start_menu.rs
@@ -138,11 +138,20 @@ impl EntityCommand for Label {
     }
 }
 
-fn setup(mut commands: Commands) {
+fn handle_game_finished(mut events: EventReader<events::GameFinished>, mut commands: Commands) {
+    if events.is_empty() {
+        return;
+    }
+
+    events.clear();
+    info!("Game finished, reconstructing start menu");
+    spawn_start_menu(commands);
+}
+
+fn spawn_start_menu(mut commands: Commands) {
     let red = Color::rgb(0.8, 0.2, 0.2);
     let green = Color::rgb(0.2, 0.8, 0.2);
 
-    commands.spawn(Camera2dBundle::default());
     commands
         .spawn((Name::new("Start Menu"), MainMenu, column()))
         .with_children(|menu| {
@@ -180,10 +189,18 @@ fn setup(mut commands: Commands) {
         });
 }
 
+fn setup(mut commands: Commands) {
+    commands.spawn(Camera2dBundle::default());
+    spawn_start_menu(commands);
+}
+
 impl Plugin for StartMenu {
     fn build(&self, app: &mut App) {
         app.add_plugins(ui::Plugin {});
         app.add_systems(Startup, setup);
-        app.add_systems(Update, (click_quit, click_play, handle_play));
+        app.add_systems(
+            Update,
+            (click_quit, click_play, handle_play, handle_game_finished),
+        );
     }
 }