1 files changed, 185 insertions, 0 deletions
diff --git a/2020-overdrive/src/json.rs b/2020-overdrive/src/json.rs
new file mode 100644
index 0000000..82fc9fc
--- /dev/null
+++ b/2020-overdrive/src/json.rs
@@ -0,0 +1,185 @@
+use std::convert::TryInto;
+use std::fs::File;
+use std::io::prelude::*;
+use std::rc::Rc;
+
+use anyhow::Result;
+use serde::{Deserialize, Serialize};
+use serde_json;
+use serde_repr::{Deserialize_repr, Serialize_repr};
+
+use crate::state::*;
+
+pub fn read_state_from_json_file(filename: &str) -> Result<GameState> {
+    let mut file = File::open(filename)?;
+    let mut content = String::new();
+    file.read_to_string(&mut content)?;
+    let json_state: JsonState = serde_json::from_str(content.as_ref())?;
+    json_state.to_game_state()
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct JsonState {
+    // pub current_round: usize,
+    // pub max_rounds: usize,
+    pub player: JsonPlayer,
+    pub opponent: JsonOpponent,
+    pub world_map: Vec<Vec<JsonWorldMapCell>>,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct JsonPlayer {
+    // id: usize,
+    position: JsonPosition,
+    speed: u16,
+    // state: JsonPlayerState,
+    powerups: Vec<JsonPowerup>,
+    // boosting: bool,
+    boost_counter: u8,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct JsonOpponent {
+    // id: usize,
+    position: JsonPosition,
+    speed: u16,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct JsonWorldMapCell {
+    position: JsonPosition,
+    surface_object: JsonSurfaceObject,
+    // occupied_by_player_id: usize,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct JsonPosition {
+    y: u8,
+    x: u16,
+}
+
+// #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
+// #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+// pub enum JsonPlayerState {
+//     Ready,
+//     Nothing,
+//     TurningLeft,
+//     TurningRight,
+//     Accelerating,
+//     Decelarating,
+//     PickedUpPowerup,
+//     UsedBoost,
+//     UsedOil,
+//     HitMud,
+//     HitOil,
+//     Finishing,
+// }
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum JsonPowerup {
+    Boost,
+    Oil,
+}
+
+#[derive(Serialize_repr, Deserialize_repr, Clone, Debug, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+#[repr(u8)]
+pub enum JsonSurfaceObject {
+    Empty = 0,
+    Mud = 1,
+    OilSpill = 2,
+    OilItem = 3,
+    FinishLine = 4,
+    Boost = 5,
+}
+
+impl JsonState {
+    fn to_game_state(&self) -> Result<GameState> {
+        Ok(GameState {
+            status: GameStatus::Continue,
+            players: [self.player.to_player()?, self.opponent.to_player()],
+            muds: Rc::new(
+                self.world_map
+                    .iter()
+                    .flatten()
+                    .filter(|cell| cell.surface_object == JsonSurfaceObject::Mud)
+                    .map(|cell| cell.position.to_position())
+                    .collect(),
+            ),
+            oil_spills: Rc::new(
+                self.world_map
+                    .iter()
+                    .flatten()
+                    .filter(|cell| cell.surface_object == JsonSurfaceObject::OilSpill)
+                    .map(|cell| cell.position.to_position())
+                    .collect(),
+            ),
+            powerup_oils: Rc::new(
+                self.world_map
+                    .iter()
+                    .flatten()
+                    .filter(|cell| cell.surface_object == JsonSurfaceObject::OilItem)
+                    .map(|cell| cell.position.to_position())
+                    .collect(),
+            ),
+            powerup_boosts: Rc::new(
+                self.world_map
+                    .iter()
+                    .flatten()
+                    .filter(|cell| cell.surface_object == JsonSurfaceObject::Boost)
+                    .map(|cell| cell.position.to_position())
+                    .collect(),
+            ),
+        })
+    }
+}
+
+impl JsonPlayer {
+    fn to_player(&self) -> Result<Player> {
+        Ok(Player {
+            position: self.position.to_position(),
+            speed: self.speed,
+            boost_remaining: self.boost_counter,
+            oils: self
+                .powerups
+                .iter()
+                .filter(|powerup| **powerup == JsonPowerup::Oil)
+                .count()
+                .try_into()?,
+            boosts: self
+                .powerups
+                .iter()
+                .filter(|powerup| **powerup == JsonPowerup::Boost)
+                .count()
+                .try_into()?,
+        })
+    }
+}
+
+impl JsonOpponent {
+    // TODO: Track opponent powerups from round to round?
+    fn to_player(&self) -> Player {
+        Player {
+            position: self.position.to_position(),
+            speed: self.speed,
+            boost_remaining: 0,
+            oils: 0,
+            boosts: 0,
+        }
+    }
+}
+
+impl JsonPosition {
+    fn to_position(&self) -> Position {
+        Position {
+            x: self.x,
+            y: self.y,
+        }
+    }
+}