From 9f6f3db682ab927fef4f1399d13c4cfc91313f82 Mon Sep 17 00:00:00 2001
From: Daniel Schadt <kingdread@gmx.de>
Date: Thu, 14 Jun 2018 17:26:23 +0200
Subject: deal with multiple boss agents

Exemplary done with Xera.
---
 src/lib.rs                 | 25 +++++++++++++++++++++++++
 src/statistics/gamedata.rs | 25 +++++++++++++++++++------
 2 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index c81a519..ab32bd1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -35,6 +35,8 @@ pub use event::{Event, EventKind};
 
 pub mod statistics;
 
+use statistics::gamedata::{self, Boss};
+
 /// A macro that returns `true` when the given expression matches the pattern.
 ///
 /// ```rust
@@ -165,12 +167,35 @@ impl Log {
     }
 
     /// Return the boss agent.
+    ///
+    /// Be careful with encounters that have multiple boss agents, such as Trio
+    /// and Xera.
     pub fn boss(&self) -> &Agent {
         self.npcs()
             .find(|n| matches!(n.kind, AgentKind::Character(x) if x == self.boss_id))
             .expect("Boss has no agent!")
     }
 
+    /// Return all boss agents.
+    ///
+    /// This correctly returns multiple agents on encounters where multiple
+    /// agents are needed.
+    pub fn boss_agents(&self) -> Vec<&Agent> {
+        let boss_ids = if self.boss_id == Boss::Xera as u16 {
+            vec![self.boss_id, gamedata::XERA_PHASE2_ID]
+        } else {
+            vec![self.boss_id]
+        };
+        self.npcs()
+            .filter(|a| matches!(a.kind, AgentKind::Character(x) if boss_ids.contains(&x)))
+            .collect()
+    }
+
+    /// Check whether the given address is a boss agent.
+    pub fn is_boss(&self, addr: u64) -> bool {
+        self.boss_agents().into_iter().any(|a| *a.addr() == addr)
+    }
+
     /// Return all events present in this log.
     pub fn events(&self) -> &[Event] {
         &self.events
diff --git a/src/statistics/gamedata.rs b/src/statistics/gamedata.rs
index ea1be39..1b5fec6 100644
--- a/src/statistics/gamedata.rs
+++ b/src/statistics/gamedata.rs
@@ -5,9 +5,24 @@ use super::boon::{BoonQueue, BoonType};
 /// Enum containing all bosses with their IDs.
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum Boss {
-    ValeGuardian = 15483,
+    ValeGuardian = 0x3C4E,
+
+    /// Xera ID for phase 1.
+    ///
+    /// This is only half of Xera's ID, as there will be a second agent for the
+    /// second phase. This agent will have another ID, see
+    /// [`XERA_PHASE2_ID`](constant.XERA_PHASE2_ID.html).
+    Xera = 0x3F76,
 }
 
+/// ID for Xera in the second phase.
+///
+/// The original Xera will despawn, and after the tower phase, a separate spawn
+/// will take over. This new Xera will have this ID. Care needs to be taken when
+/// calculating boss damage on this encounter, as both Xeras have to be taken
+/// into account.
+pub const XERA_PHASE2_ID: u16 = 0x3F9E;
+
 /// Contains a boon.
 ///
 /// Fields:
@@ -103,11 +118,9 @@ macro_rules! mechanics {
 }
 
 /// A slice of all mechanics that we know about.
-pub static MECHANICS: &[Mechanic] = &[
-    mechanics! { Boss::ValeGuardian => [
-        "Unstable Magic Spike" => Trigger::SkillOnPlayer(31860),
-    ]},
-];
+pub static MECHANICS: &[Mechanic] = &[mechanics! { Boss::ValeGuardian => [
+    "Unstable Magic Spike" => Trigger::SkillOnPlayer(31860),
+]}];
 
 /// Get all mechanics that belong to the given boss.
 pub fn get_mechanics(boss_id: u16) -> Vec<&'static Mechanic> {
-- 
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