From b099be3c38b6754ec4f0c962d7bbe188e69f9c95 Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin@worthe-it.co.za>
Date: Sun, 22 Jul 2018 22:15:46 +0200
Subject: Naive implementation of depth first walk of the state space

This does not run in a time that terminates in human time I think.
---
 src/bin/depth-first-search.rs | 103 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/bin/depth-first-search.rs

diff --git a/src/bin/depth-first-search.rs b/src/bin/depth-first-search.rs
new file mode 100644
index 0000000..c2b82de
--- /dev/null
+++ b/src/bin/depth-first-search.rs
@@ -0,0 +1,103 @@
+extern crate zombot;
+extern crate time;
+use time::PreciseTime;
+
+use zombot::*;
+use zombot::engine::*;
+use zombot::engine::settings::*;
+use zombot::engine::constants::*;
+use zombot::engine::command::*;
+
+const STATE_PATH: &str = "tests/state0.json";
+
+use std::process;
+
+fn main() {
+    println!("Performing an exhaustive depth-first walk of the game states");
+    let start_time = PreciseTime::now();
+    let (settings, state) = match input::json::read_bitwise_state_from_file(STATE_PATH) {
+        Ok(ok) => ok,
+        Err(error) => {
+            println!("Error while parsing JSON file: {}", error);
+            process::exit(1);
+        }
+    };
+
+    walk_states(&settings, &state, 0);
+
+    println!("Total running time: {}", start_time.to(PreciseTime::now()));
+}
+
+fn walk_states<GS: GameState>(settings: &GameSettings, state: &GS, depth: u32) {
+    if depth >= 200 {
+        return;
+    }
+
+    let player_buildings = valid_buildings(settings, &state.player(), state.player_has_max_teslas());
+    let opponent_buildings = valid_buildings(settings, &state.opponent(), state.opponent_has_max_teslas());
+
+    for &player_building in &player_buildings {
+        for player_i in 0..state.unoccupied_player_cell_count() {
+            for &opponent_building in &opponent_buildings {
+                for opponent_i in 0..state.unoccupied_opponent_cell_count() {
+                    let player_point = state.location_of_unoccupied_player_cell(player_i);
+                    let player_move = Command::Build(player_point, player_building);
+                    let opponent_point = state.location_of_unoccupied_player_cell(opponent_i);
+                    let opponent_move = Command::Build(opponent_point, opponent_building);
+
+                    let mut after_move = state.clone();
+                    let status = after_move.simulate(settings, player_move, opponent_move);
+                    if status == GameStatus::Continue {
+                        walk_states(settings, &after_move, depth+1);
+                    }
+                }
+            }
+        }
+    }
+    for player_building in player_buildings {
+        for player_i in 0..state.unoccupied_player_cell_count() {
+            let player_point = state.location_of_unoccupied_player_cell(player_i);
+            let player_move = Command::Build(player_point, player_building);
+            let opponent_move = Command::Nothing;
+
+            let mut after_move = state.clone();
+            let status = after_move.simulate(settings, player_move, opponent_move);
+            if status == GameStatus::Continue {
+                walk_states(settings, &after_move, depth+1);
+            }
+        }
+    }
+    for opponent_building in opponent_buildings {
+        for opponent_i in 0..state.unoccupied_opponent_cell_count() {
+            let player_move = Command::Nothing;
+            let opponent_point = state.location_of_unoccupied_player_cell(opponent_i);
+            let opponent_move = Command::Build(opponent_point, opponent_building);
+
+            let mut after_move = state.clone();
+            let status = after_move.simulate(settings, player_move, opponent_move);
+            if status == GameStatus::Continue {
+                walk_states(settings, &after_move, depth+1);
+            }
+        }
+    }
+    let player_move = Command::Nothing;
+    let opponent_move = Command::Nothing;
+    let mut after_move = state.clone();
+    let status = after_move.simulate(settings, player_move, opponent_move);
+    if status == GameStatus::Continue {
+        walk_states(settings, &after_move, depth+1);
+    }
+}
+
+fn valid_buildings(settings: &GameSettings, player: &Player, has_max_teslas: bool) -> Vec<BuildingType> {
+    let mut result = Vec::with_capacity(4);
+    for b in BuildingType::all().iter() {
+        let building_setting = settings.building_settings(*b);
+        let affordable = building_setting.price <= player.energy;
+        let is_tesla = *b == BuildingType::Tesla;
+        if affordable && (!is_tesla || !has_max_teslas) {
+            result.push(*b);
+        }
+    }
+    result
+}
-- 
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