ai refactor, mob spawns now take into account player level, small fixes

src/ai/quip_system.rs

@@ -0,0 +1,38 @@
+use crate::{gamelog, Name, Quips, TakingTurn, Viewshed};
+use rltk::prelude::*;
+use specs::prelude::*;
+
+pub struct QuipSystem {}
+
+impl<'a> System<'a> for QuipSystem {
+    #[allow(clippy::type_complexity)]
+    type SystemData = (
+        WriteStorage<'a, Quips>,
+        ReadStorage<'a, Name>,
+        ReadStorage<'a, TakingTurn>,
+        ReadExpect<'a, Point>,
+        ReadStorage<'a, Viewshed>,
+        WriteExpect<'a, RandomNumberGenerator>,
+    );
+
+    fn run(&mut self, data: Self::SystemData) {
+        let (mut quips, names, turns, player_pos, viewsheds, mut rng) = data;
+        for (quip, name, viewshed, _turn) in (&mut quips, &names, &viewsheds, &turns).join() {
+            if !quip.available.is_empty() && viewshed.visible_tiles.contains(&player_pos) && rng.roll_dice(1, 6) == 1 {
+                let quip_index = if quip.available.len() == 1 {
+                    0
+                } else {
+                    (rng.roll_dice(1, quip.available.len() as i32) - 1) as usize
+                };
+                gamelog::Logger::new()
+                    .append("The")
+                    .npc_name(&name.name)
+                    .append_n("says \"")
+                    .append_n(&quip.available[quip_index])
+                    .append("\"")
+                    .log();
+                quip.available.remove(quip_index);
+            }
+        }
+    }
+}