145 lines
4.6 KiB
Rust
145 lines
4.6 KiB
Rust
use hashbrown::HashMap;
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use crate::static_data::Statistic;
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use crate::StringKey;
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/// A nature is an attribute on a Pokemon that modifies the effective base stats on a Pokemon. They
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/// can have an increased statistic and a decreased statistic, or be neutral.
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#[derive(Debug)]
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pub struct Nature {
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/// The stat that should receive the increased modifier.
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increase_stat: Statistic,
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/// The stat that should receive the decreased modifier.
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decrease_stat: Statistic,
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/// The amount by which the increased stat is multiplied.
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increase_modifier: f32,
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/// The amount by which the decreased stat is multiplied.
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decrease_modifier: f32,
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}
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impl Nature {
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/// Instantiates a new statistic.
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pub fn new(
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increase_stat: Statistic,
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decrease_stat: Statistic,
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increase_modifier: f32,
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decrease_modifier: f32,
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) -> Self {
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Self {
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increase_stat,
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decrease_stat,
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increase_modifier,
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decrease_modifier,
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}
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}
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/// The stat that should receive the increased modifier.
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pub fn increased_stat(&self) -> Statistic {
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self.increase_stat
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}
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/// The stat that should receive the decreased modifier.
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pub fn decreased_stat(&self) -> Statistic {
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self.decrease_stat
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}
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/// Calculates the modifier for a given stat. If it's the increased stat, returns the increased
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/// modifier, if it's the decreased stat, returns the decreased modifier. Otherwise returns 1.0
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pub fn get_stat_modifier(&self, stat: Statistic) -> f32 {
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if stat == self.increase_stat {
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self.increase_modifier
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} else if stat == self.decrease_stat {
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self.decrease_modifier
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} else {
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1.0
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}
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}
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}
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/// A library of all natures that can be used, stored by their names.
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#[derive(Debug)]
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pub struct NatureLibrary {
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/// The underlying data structure.
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map: HashMap<StringKey, Nature>,
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}
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impl NatureLibrary {
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/// Creates a new nature library with a given capacity.
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pub fn new(capacity: usize) -> Self {
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NatureLibrary {
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map: HashMap::with_capacity(capacity),
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}
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}
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/// Adds a new nature with name to the library.
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pub fn load_nature(&mut self, name: StringKey, nature: Nature) {
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self.map.insert(name, nature);
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}
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/// Gets a nature by name.
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pub fn get_nature(&self, key: &StringKey) -> Option<&Nature> {
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self.map.get(key)
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}
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/// Finds a nature name by nature.
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pub fn get_nature_name(&self, nature: &Nature) -> StringKey {
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for kv in &self.map {
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// As natures can't be copied, and should always be the same reference as the value
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// in the map, we just compare by reference.
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if std::ptr::eq(kv.1, nature) {
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return kv.0.clone();
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}
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}
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panic!("No name was found for the given nature. This should never happen.");
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}
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}
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#[cfg(test)]
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pub mod tests {
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use crate::static_data::natures::{Nature, NatureLibrary};
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use crate::static_data::statistics::Statistic;
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pub fn build() -> NatureLibrary {
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let mut lib = NatureLibrary::new(2);
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lib.load_nature(
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"test_nature".into(),
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Nature::new(Statistic::HP, Statistic::Attack, 1.1, 0.9),
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);
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lib
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}
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#[test]
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fn create_nature_library_insert_and_retrieve() {
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let mut lib = NatureLibrary::new(2);
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lib.load_nature("foo".into(), Nature::new(Statistic::HP, Statistic::Attack, 1.1, 0.9));
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lib.load_nature(
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"bar".into(),
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Nature::new(Statistic::Attack, Statistic::Defense, 1.1, 0.9),
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);
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let n1 = lib.get_nature(&"foo".into()).expect("Nature was not found");
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assert_eq!(n1.increase_stat, Statistic::HP);
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assert_eq!(n1.decrease_stat, Statistic::Attack);
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assert_eq!(n1.increase_modifier, 1.1);
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assert_eq!(n1.decrease_modifier, 0.9);
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}
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#[test]
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fn create_nature_library_insert_and_get_name() {
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let mut lib = NatureLibrary::new(2);
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lib.load_nature("foo".into(), Nature::new(Statistic::HP, Statistic::Attack, 1.1, 0.9));
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lib.load_nature(
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"bar".into(),
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Nature::new(Statistic::Attack, Statistic::Defense, 1.1, 0.9),
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);
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let n1 = lib.get_nature(&"foo".into()).expect("Nature was not found");
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let name = lib.get_nature_name(n1);
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assert_eq!(name, "foo".into());
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let n2 = lib.get_nature(&"bar".into()).expect("Nature was not found");
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let name2 = lib.get_nature_name(n2);
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assert_eq!(name2, "bar".into());
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}
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}
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