1 files changed, 185 insertions, 0 deletions
diff --git a/src/json.rs b/src/json.rs
new file mode 100644
index 0000000..18e13fb
--- /dev/null
+++ b/src/json.rs
@@ -0,0 +1,185 @@
+use std::fs::File;
+use std::io::prelude::*;
+use serde_json;
+use std::error::Error;
+use std::cmp;
+
+use ::engine;
+
+
+pub fn read_state_from_file(filename: &str) -> Result<(engine::settings::GameSettings, engine::GameState), Box<Error>> {
+    let mut file = File::open(filename)?;
+    let mut content = String::new();
+    file.read_to_string(&mut content)?;
+    let state: State = serde_json::from_str(content.as_ref())?;
+    Ok((state.to_engine_settings(), state.to_engine()))
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct State {
+    game_details: GameDetails,
+    players: Vec<Player>,
+    game_map: Vec<Vec<GameCell>>,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct GameDetails {
+    //round: u32,
+    map_width: u8,
+    map_height: u8,
+    building_prices: BuildingPrices
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+struct BuildingPrices {
+    energy: u16,
+    defense: u16,
+    attack: u16
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct Player {
+    player_type: char,
+    energy: u16,
+    health: u16,
+    //hits_taken: u32,
+    //score: u32
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct GameCell {
+    //x: u8,
+    //y: u8,
+    buildings: Vec<BuildingState>,
+    missiles: Vec<MissileState>,
+    //cell_owner: char
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct BuildingState {
+    health: u16,
+    construction_time_left: i8,
+    //price: u16,
+    weapon_damage: u16,
+    weapon_speed: u8,
+    weapon_cooldown_time_left: u8,
+    weapon_cooldown_period: u8,
+    //destroy_multiplier: u32,
+    //construction_score: u32,
+    energy_generated_per_turn: u16,
+    //building_type: String,
+    x: u8,
+    y: u8,
+    player_type: char
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct MissileState {
+    damage: u16,
+    speed: u8,
+    x: u8,
+    y: u8,
+    player_type: char
+}
+
+
+impl State {
+    fn to_engine_settings(&self) -> engine::settings::GameSettings {
+        engine::settings::GameSettings {
+            size: engine::geometry::Point::new(self.game_details.map_width, self.game_details.map_height),
+            energy_income: 5,
+            energy_price: self.game_details.building_prices.energy,
+            defence_price: self.game_details.building_prices.defense,
+            attack_price: self.game_details.building_prices.attack,
+        }
+    }
+    
+    fn to_engine(&self) -> engine::GameState {
+        engine::GameState {
+            status: engine::GameStatus::Continue,
+            player: self.player().to_engine(),
+            opponent: self.opponent().to_engine(),
+            player_buildings: self.buildings_to_engine('A'),
+            opponent_buildings: self.buildings_to_engine('B'),
+            player_missiles: self.missiles_to_engine('A'),
+            opponent_missiles: self.missiles_to_engine('B'),
+        }
+    }
+
+    fn player(&self) -> &Player {
+        self.players.iter()
+            .filter(|p| p.player_type == 'A')
+            .next()
+            .expect("Player character did not appear in state.json")
+    }
+
+    fn opponent(&self) -> &Player {
+        self.players.iter()
+            .filter(|p| p.player_type != 'B')
+            .next()
+            .expect("Opponent character did not appear in state.json")
+    }
+
+    fn buildings_to_engine(&self, player_type: char) -> Vec<engine::Building> {
+        self.game_map.iter()
+            .flat_map(|row| row.iter()
+                      .flat_map(|cell| cell.buildings.iter()
+                                .filter(|b| b.player_type == player_type)
+                                .map(|b| b.to_engine())
+                      )
+            )
+            .collect()
+    }
+
+    fn missiles_to_engine(&self, player_type: char) -> Vec<engine::Missile> {
+        self.game_map.iter()
+            .flat_map(|row| row.iter()
+                      .flat_map(|cell| cell.missiles.iter()
+                                .filter(|b| b.player_type == player_type)
+                                .map(|b| b.to_engine())
+                      )
+            )
+            .collect()
+    }
+}
+
+impl Player {
+    fn to_engine(&self) -> engine::Player {
+        engine::Player {
+            energy: self.energy,
+            health: self.health,
+        }
+    }
+}
+
+impl BuildingState {
+    fn to_engine(&self) -> engine::Building {
+        engine::Building {
+            pos: engine::geometry::Point::new(self.x, self.y),
+            health: self.health,
+            construction_time_left: cmp::max(0, self.construction_time_left) as u8,
+            weapon_damage: self.weapon_damage,
+            weapon_speed: self.weapon_speed,
+            weapon_cooldown_time_left: self.weapon_cooldown_time_left,
+            weapon_cooldown_period: self.weapon_cooldown_period,
+            energy_generated_per_turn: self.energy_generated_per_turn,
+        }
+    }
+}
+
+impl MissileState {
+    fn to_engine(&self) -> engine::Missile {
+        engine::Missile {
+            pos: engine::geometry::Point::new(self.x, self.y),
+            damage: self.damage,
+            speed: self.speed,
+        }
+    }
+}