1 files changed, 170 insertions, 0 deletions
diff --git a/src/statistics.rs b/src/statistics.rs
new file mode 100644
index 0000000..af208ce
--- /dev/null
+++ b/src/statistics.rs
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+//! This module aids in the creation of actual boss statistics.
+use super::*;
+use std::collections::HashMap;
+
+pub type StatResult<T> = Result<T, StatError>;
+
+quick_error! {
+    #[derive(Clone, Debug)]
+    pub enum StatError {
+    }
+}
+
+/// A struct containing the calculated statistics for the log.
+#[derive(Clone, Debug)]
+pub struct Statistics {
+    /// A map mapping agent addresses to their stats.
+    pub agent_stats: HashMap<u64, AgentStats>,
+}
+
+/// A struct describing the agent statistics.
+#[derive(Clone, Debug, Default)]
+pub struct AgentStats {
+    /// Damage done per target during the fight.
+    ///
+    /// Maps from target address to the damage done to this target.
+    pub per_target_damage: HashMap<u64, DamageStats>,
+    /// Total damage dealt during the fight.
+    pub total_damage: DamageStats,
+    /// Damage directed to the boss.
+    pub boss_damage: DamageStats,
+    /// Time when the agent has entered combat (millseconds since log start).
+    pub enter_combat: u64,
+    /// Time when the agent has left combat (millseconds since log start).
+    pub exit_combat: u64,
+}
+
+impl AgentStats {
+    /// Returns the combat time of this agent in milliseconds.
+    pub fn combat_time(&self) -> u64 {
+        self.exit_combat - self.enter_combat
+    }
+}
+
+/// Damage statistics for a given target.
+#[derive(Debug, Clone, Copy, Default)]
+pub struct DamageStats {
+    /// The total damage of the player, including all minions/pets/...
+    pub total_damage: u64,
+    /// The condition damage that the player dealt.
+    pub condition_damage: u64,
+    /// The power damage that the player dealt.
+    pub power_damage: u64,
+    /// The damage that was done by minions/pets/...
+    pub add_damage: u64,
+}
+
+// A support macro to introduce a new block.
+//
+// Doesn't really require a macro, but it's nicer to look at
+//   with! { foo = bar }
+// rather than
+//   { let foo = bar; ... }
+macro_rules! with {
+    ($name:ident = $expr:expr => $bl:block) => {{
+        let $name = $expr;
+        $bl
+    }};
+}
+
+/// Calculate the statistics for the given log.
+pub fn calculate(log: &Log) -> StatResult<Statistics> {
+    use super::EventKind::*;
+
+    let mut agent_stats = HashMap::<u64, AgentStats>::new();
+    let mut log_start_time = 0;
+
+    fn get_stats(map: &mut HashMap<u64, AgentStats>, source: u64, target: u64) -> &mut DamageStats {
+        map.entry(source)
+            .or_insert_with(Default::default)
+            .per_target_damage
+            .entry(target)
+            .or_insert_with(Default::default)
+    }
+
+    for event in log.events() {
+        match event.kind {
+            LogStart { .. } => {
+                log_start_time = event.time;
+            }
+
+            EnterCombat { agent_addr, .. } => {
+                agent_stats
+                    .entry(agent_addr)
+                    .or_insert_with(Default::default)
+                    .enter_combat = event.time - log_start_time;
+            }
+
+            ExitCombat { agent_addr } => {
+                agent_stats
+                    .entry(agent_addr)
+                    .or_insert_with(Default::default)
+                    .exit_combat = event.time - log_start_time;
+            }
+
+            Physical {
+                source_agent_addr,
+                destination_agent_addr,
+                damage,
+                ..
+            } => {
+                with! { stats = get_stats(&mut agent_stats, source_agent_addr, destination_agent_addr) => {
+                    stats.total_damage += damage as u64;
+                    stats.power_damage += damage as u64;
+                }}
+
+                if let Some(master) = log.master_agent(source_agent_addr) {
+                    let master_stats =
+                        get_stats(&mut agent_stats, master.addr, destination_agent_addr);
+                    master_stats.total_damage += damage as u64;
+                    master_stats.add_damage += damage as u64;
+                }
+            }
+
+            ConditionTick {
+                source_agent_addr,
+                destination_agent_addr,
+                damage,
+                ..
+            } => {
+                with! { stats = get_stats(&mut agent_stats, source_agent_addr, destination_agent_addr) => {
+                    stats.total_damage += damage as u64;
+                    stats.condition_damage += damage as u64;
+                }}
+
+                if let Some(master) = log.master_agent(source_agent_addr) {
+                    let master_stats =
+                        get_stats(&mut agent_stats, master.addr, destination_agent_addr);
+                    master_stats.total_damage += damage as u64;
+                    master_stats.add_damage += damage as u64;
+                }
+            }
+
+            _ => (),
+        }
+    }
+
+    let boss = log.boss();
+
+    for agent_stat in agent_stats.values_mut() {
+        tally_damage(agent_stat);
+        agent_stat.boss_damage = agent_stat
+            .per_target_damage
+            .get(&boss.addr)
+            .cloned()
+            .unwrap_or_else(Default::default);
+    }
+
+    Ok(Statistics { agent_stats })
+}
+
+/// Takes the per target damage stats and tallies them up into the total damage
+/// stats.
+fn tally_damage(stats: &mut AgentStats) {
+    for damage in stats.per_target_damage.values() {
+        stats.total_damage.total_damage += damage.total_damage;
+        stats.total_damage.power_damage += damage.power_damage;
+        stats.total_damage.condition_damage += damage.condition_damage;
+        stats.total_damage.add_damage += damage.add_damage;
+    }
+}