use crate::dynamic_data::models::pokemon::Pokemon;
use crate::static_data::statistic_set::StatisticSet;
use crate::static_data::statistics::Statistic;

#[derive(Debug)]
pub struct BattleStatCalculator {}

impl BattleStatCalculator {
    pub fn calculate_flat_stats(&self, pokemon: &Pokemon) -> StatisticSet<u32> {
        StatisticSet::<u32>::new(
            self.calculate_health_stat(pokemon),
            self.calculate_other_stat(pokemon, Statistic::Attack),
            self.calculate_other_stat(pokemon, Statistic::Defense),
            self.calculate_other_stat(pokemon, Statistic::SpecialAttack),
            self.calculate_other_stat(pokemon, Statistic::SpecialDefense),
            self.calculate_other_stat(pokemon, Statistic::Speed),
        )
    }

    pub fn calculate_flat_stat(&self, pokemon: &Pokemon, stat: Statistic) -> u32 {
        if stat == Statistic::HP {
            self.calculate_health_stat(pokemon)
        } else {
            self.calculate_other_stat(pokemon, stat)
        }
    }

    pub fn calculate_boosted_stats(&self, pokemon: &Pokemon) -> StatisticSet<u32> {
        StatisticSet::<u32>::new(
            self.calculate_boosted_stat(pokemon, Statistic::HP),
            self.calculate_boosted_stat(pokemon, Statistic::Attack),
            self.calculate_boosted_stat(pokemon, Statistic::Defense),
            self.calculate_boosted_stat(pokemon, Statistic::SpecialAttack),
            self.calculate_boosted_stat(pokemon, Statistic::SpecialDefense),
            self.calculate_boosted_stat(pokemon, Statistic::Speed),
        )
    }

    pub fn calculate_boosted_stat(&self, pokemon: &Pokemon, stat: Statistic) -> u32 {
        (self.calculate_flat_stat(pokemon, stat) as f32
            * self.get_stat_boost_modifier(pokemon, stat)) as u32
    }

    fn calculate_health_stat(&self, pokemon: &Pokemon) -> u32 {
        let base = pokemon.form().get_base_stat(Statistic::HP) as u32;
        let iv = pokemon.individual_values().hp() as u32;
        let ev = pokemon.effort_values().hp() as u32;
        let level = pokemon.level() as u32;
        (((2 * base + iv + (ev / 4)) * level) / 100) + level + 10
    }

    fn calculate_other_stat(&self, pokemon: &Pokemon, stat: Statistic) -> u32 {
        let base = pokemon.form().get_base_stat(stat) as u32;
        let iv = pokemon.individual_values().get_stat(stat) as u32;
        let ev = pokemon.effort_values().get_stat(stat) as u32;
        let level = pokemon.level() as u32;
        let unmodified = (((2 * base + iv + (ev / 4)) * level) / 100) + 5;
        return (unmodified as f32 * pokemon.nature().get_stat_modifier(stat)) as u32;
    }

    fn get_stat_boost_modifier(&self, pokemon: &Pokemon, stat: Statistic) -> f32 {
        let boost = pokemon.stat_boost().get_stat(stat);
        match boost {
            -6 => 2.0 / 8.0,
            -5 => 2.0 / 7.0,
            -4 => 2.0 / 6.0,
            -3 => 2.0 / 5.0,
            -2 => 2.0 / 4.0,
            -1 => 2.0 / 3.0,
            0 => 1.0,
            1 => 3.0 / 2.0,
            2 => 4.0 / 2.0,
            3 => 5.0 / 2.0,
            4 => 6.0 / 2.0,
            5 => 7.0 / 2.0,
            6 => 8.0 / 2.0,
            _ => panic!("Stat boost was out of expected range of -6 to 6"),
        }
    }
}