use crate::defines::{LevelInt, MAX_MOVES};
use crate::dynamic_data::libraries::dynamic_library::DynamicLibrary;
use crate::dynamic_data::models::battle::Battle;
use crate::dynamic_data::models::learned_move::LearnedMove;
use crate::dynamic_data::script_handling::script::Script;
use crate::dynamic_data::script_handling::script_set::ScriptSet;
use crate::dynamic_data::script_handling::ScriptSource;
use crate::static_data::items::item::Item;
use crate::static_data::species_data::ability_index::AbilityIndex;
use crate::static_data::species_data::form::Form;
use crate::static_data::species_data::gender::Gender;
use crate::static_data::species_data::species::Species;
use crate::static_data::statistic_set::StatisticSet;
use crate::static_data::statistics::Statistic;
use crate::utils::random::Random;
use derive_getters::Getters;
use std::collections::HashSet;
use std::sync::{RwLock, Weak};

#[derive(Debug)]
pub struct PokemonBattleData<'a> {
    battle: Weak<RwLock<Battle<'a>>>,
    battle_side_index: u8,
    index: u8,
    on_battle_field: bool,
    seen_opponents: HashSet<u32>,
}

impl<'a> PokemonBattleData<'a> {
    pub fn battle(&'a mut self) -> &'a mut Weak<RwLock<Battle<'a>>> {
        &mut self.battle
    }
    pub fn battle_side_index(&self) -> u8 {
        self.battle_side_index
    }
    pub fn on_battle_field(&'a mut self) -> &mut bool {
        &mut self.on_battle_field
    }
    pub fn seen_opponents(&'a mut self) -> &'a mut HashSet<u32> {
        &mut self.seen_opponents
    }
}

#[derive(Getters, Debug)]
pub struct Pokemon<'a> {
    library: &'a DynamicLibrary<'a>,
    species: &'a Species<'a>,
    form: &'a Form<'a>,

    display_species: Option<&'a Species<'a>>,
    display_form: Option<&'a Form<'a>>,

    level: LevelInt,
    experience: u32,
    unique_identifier: u32,
    gender: Gender,
    coloring: u8,
    held_item: Option<&'a Item>,
    health: u32,

    weight: f32,
    height: f32,

    stat_boost: StatisticSet<i8>,
    flat_stats: StatisticSet<u16>,
    boosted_stats: StatisticSet<u16>,

    nickname: Option<String>,

    ability_index: AbilityIndex,
    is_ability_overridden: bool,
    overridden_ability_name: String,

    battle_data: Option<PokemonBattleData<'a>>,

    moves: [Option<LearnedMove>; MAX_MOVES],
    allowed_experience: bool,

    types: Vec<u8>,

    ability_script: Option<Box<dyn Script>>,
    status_script: Option<Box<dyn Script>>,
    volatile: ScriptSet,
}

impl<'a> Pokemon<'a> {
    pub fn new(
        library: &'a DynamicLibrary,
        species: &'a Species,
        form: &'a Form,
        ability: AbilityIndex,
        level: LevelInt,
        unique_identifier: u32,
        gender: Gender,
        coloring: u8,
    ) -> Pokemon<'a> {
        // Calculate experience from the level for the specified growth rate.
        let experience = library
            .static_data()
            .growth_rates()
            .calculate_experience(species.growth_rate(), level);
        let health = form.get_base_stat(Statistic::HP) as u32;
        let weight = *form.weight();
        let height = *form.height();
        Pokemon {
            library,
            species,
            form,
            display_species: None,
            display_form: None,
            level,
            experience,
            unique_identifier,
            gender,
            coloring,
            held_item: None,
            health,
            weight,
            height,
            stat_boost: Default::default(),
            flat_stats: *form.base_stats(),
            boosted_stats: *form.base_stats(),
            nickname: None,
            ability_index: ability,
            is_ability_overridden: false,
            overridden_ability_name: "".to_string(),
            battle_data: None,
            moves: [None, None, None, None],
            allowed_experience: false,
            types: form.types().to_vec(),
            ability_script: None,
            status_script: None,
            volatile: ScriptSet {},
        }
    }

    pub fn change_species(&mut self, species: &'a Species, form: &'a Form) {
        self.species = species;
        self.form = form;

        // If the pokemon is genderless, but it's new species is not, we want to set its gender
        if self.gender != Gender::Genderless && *species.gender_rate() < 0.0 {
            if self.battle_data.is_some() {
                let battle_data = self.battle_data.as_mut().unwrap();
                self.gender = species.get_random_gender(
                    &mut battle_data
                        .battle
                        .upgrade()
                        .unwrap()
                        .read()
                        .unwrap()
                        .random()
                        .get_rng()
                        .lock()
                        .unwrap(),
                );
            } else {
                self.gender = species.get_random_gender(&mut Random::default());
            }
        }
        // Else if the new species is genderless, but the pokemon has a gender, make the creature genderless.
        else if *species.gender_rate() < 0.0 && self.gender != Gender::Genderless {
            self.gender = Gender::Genderless;
        }
        // TODO: Battle Event trigger
    }

    pub fn is_usable(&self) -> bool {
        todo!()
    }

    pub fn set_battle_data(&mut self, battle: Weak<RwLock<Battle<'a>>>, battle_side_index: u8) {
        if let Some(battle_data) = &mut self.battle_data {
            battle_data.battle = battle;
            battle_data.battle_side_index = battle_side_index;
        } else {
            self.battle_data = Some(PokemonBattleData {
                battle,
                battle_side_index,
                index: 0,
                on_battle_field: false,
                seen_opponents: Default::default(),
            })
        }
    }

    pub fn set_on_battlefield(&mut self, value: bool) {
        if let Some(data) = &mut self.battle_data {
            data.on_battle_field = value;
            if !value {
                self.reset_active_scripts();
                self.weight = *self.form.weight();
                self.height = *self.form.height();
            }
        }
    }

    pub fn set_battle_index(&mut self, index: u8) {
        if let Some(data) = &mut self.battle_data {
            data.index = index;
        }
    }

    pub fn mark_opponent_as_seen(&mut self, unique_identifier: u32) {
        if let Some(battle_data) = &mut self.battle_data {
            battle_data.seen_opponents.insert(unique_identifier);
        }
    }

    pub fn reset_active_scripts(&mut self) {
        todo!()
    }
}

impl<'a> ScriptSource for Pokemon<'a> {
    fn get_script_count(&self) {
        todo!()
    }
}

#[cfg(test)]
pub mod test {
    use crate::dynamic_data::libraries::dynamic_library;
    use crate::dynamic_data::models::pokemon::Pokemon;
    use crate::static_data::libraries::data_library::DataLibrary;
    use crate::static_data::species_data::ability_index::AbilityIndex;
    use crate::static_data::species_data::gender::Gender;

    #[test]
    fn construct_pokemon() {
        let lib = dynamic_library::test::build();
        let species = lib.static_data().species().get("foo").unwrap();
        let form = species.get_form("default").unwrap();

        let pokemon = Pokemon::new(
            &lib,
            species,
            form,
            AbilityIndex {
                hidden: false,
                index: 0,
            },
            10,
            0,
            Gender::Male,
            0,
        );
        assert_eq!(pokemon.species.name(), "foo");
        assert_eq!(pokemon.form.name(), "default");
    }
}