use crate::defines::LevelInt;
use crate::{ValueIdentifiable, ValueIdentifier};
use std::fmt::Debug;

/// This library holds several misc settings for the library.
pub trait LibrarySettings: Debug + ValueIdentifiable {
    /// The highest level a Pokemon can be.
    fn maximum_level(&self) -> LevelInt;

    /// The chance of a Pokemon being shiny, as the denominator of a fraction, where the nominator
    /// is 1. For example, if this is 1000, then the chance of a Pokemon being shiny is 1/1000.
    fn shiny_rate(&self) -> u32;
}

/// This library holds several misc settings for the library.
#[derive(Debug)]
pub struct LibrarySettingsImpl {
    /// A unique identifier so we know what value this is.
    identifier: ValueIdentifier,
    /// The highest level a Pokemon can be.
    maximum_level: LevelInt,
    /// The chance of a Pokemon being shiny, as the denominator of a fraction, where the nominator
    /// is 1. For example, if this is 1000, then the chance of a Pokemon being shiny is 1/1000.
    shiny_rate: u32,
}

impl LibrarySettingsImpl {
    /// Creates a new settings library.
    /// - `maximum_level` is the highest level a Pokemon can be.
    /// - `shiny_rate` is the chance of a Pokemon being shiny, as the denominator of a fraction, where
    /// the nominator is 1. For example, if this is 1000, then the chance of a Pokemon being shiny is
    /// 1/1000.
    pub fn new(maximum_level: LevelInt, shiny_rate: u32) -> Self {
        assert!(shiny_rate >= 1);
        assert!(maximum_level >= 1);
        Self {
            identifier: Default::default(),
            maximum_level,
            shiny_rate,
        }
    }
}

impl LibrarySettings for LibrarySettingsImpl {
    fn maximum_level(&self) -> LevelInt {
        self.maximum_level
    }
    fn shiny_rate(&self) -> u32 {
        self.shiny_rate
    }
}

impl ValueIdentifiable for LibrarySettingsImpl {
    fn value_identifier(&self) -> ValueIdentifier {
        self.identifier
    }
}