pub mod biped_large;
pub mod bird_medium;
pub mod bird_small;
pub mod critter;
pub mod dragon;
pub mod fish_medium;
pub mod fish_small;
pub mod humanoid;
pub mod object;
pub mod quadruped_medium;
pub mod quadruped_small;

use crate::{
    assets::{self, Asset},
    npc::NpcKind,
};
use specs::{Component, FlaggedStorage};
use specs_idvs::IDVStorage;
use std::{fs::File, io::BufReader, sync::Arc};

#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[repr(u32)]
pub enum Body {
    Humanoid(humanoid::Body) = 0,
    QuadrupedSmall(quadruped_small::Body) = 1,
    QuadrupedMedium(quadruped_medium::Body) = 2,
    BirdMedium(bird_medium::Body) = 3,
    FishMedium(fish_medium::Body) = 4,
    Dragon(dragon::Body) = 5,
    BirdSmall(bird_small::Body) = 6,
    FishSmall(fish_small::Body) = 7,
    BipedLarge(biped_large::Body) = 8,
    Object(object::Body) = 9,
    Critter(critter::Body) = 10,
}

/// Data representing data generic to the body together with per-species data.
///
/// NOTE: Deliberately don't (yet?) implement serialize.
#[derive(Clone, Debug, Deserialize)]
pub struct BodyData<BodyMeta, SpeciesData> {
    /// Shared metadata for this whole body type.
    pub body: BodyMeta,
    /// All the metadata for species with this body type.
    pub species: SpeciesData,
}

/// Metadata intended to be stored per-body, together with data intended to be
/// stored for each species for each body.
///
/// NOTE: Deliberately don't (yet?) implement serialize.
#[derive(Clone, Debug, Deserialize)]
pub struct AllBodies<BodyMeta, SpeciesMeta> {
    pub humanoid: BodyData<BodyMeta, humanoid::AllSpecies<SpeciesMeta>>,
    pub quadruped_small: BodyData<BodyMeta, quadruped_small::AllSpecies<SpeciesMeta>>,
    pub quadruped_medium: BodyData<BodyMeta, quadruped_medium::AllSpecies<SpeciesMeta>>,
    pub bird_medium: BodyData<BodyMeta, bird_medium::AllSpecies<SpeciesMeta>>,
    pub biped_large: BodyData<BodyMeta, biped_large::AllSpecies<SpeciesMeta>>,
    pub critter: BodyData<BodyMeta, critter::AllSpecies<SpeciesMeta>>,
}

/// Can only retrieve body metadata by direct index.
impl<BodyMeta, SpeciesMeta> core::ops::Index<NpcKind> for AllBodies<BodyMeta, SpeciesMeta> {
    type Output = BodyMeta;

    fn index(&self, index: NpcKind) -> &Self::Output {
        match index {
            NpcKind::Humanoid => &self.humanoid.body,
            NpcKind::Pig => &self.quadruped_small.body,
            NpcKind::Wolf => &self.quadruped_medium.body,
            NpcKind::Duck => &self.bird_medium.body,
            NpcKind::Giant => &self.biped_large.body,
            NpcKind::Rat => &self.critter.body,
        }
    }
}

impl<
    BodyMeta: Send + Sync + for<'de> serde::Deserialize<'de>,
    SpeciesMeta: Send + Sync + for<'de> serde::Deserialize<'de>,
> Asset for AllBodies<BodyMeta, SpeciesMeta>
{
    const ENDINGS: &'static [&'static str] = &["json"];

    fn parse(buf_reader: BufReader<File>) -> Result<Self, assets::Error> {
        serde_json::de::from_reader(buf_reader).map_err(|e| assets::Error::Internal(Arc::new(e)))
    }
}

impl Body {
    pub fn is_humanoid(&self) -> bool {
        match self {
            Body::Humanoid(_) => true,
            _ => false,
        }
    }

    // Note: this might need to be refined to something more complex for realistic
    // behavior with less cylindrical bodies (e.g. wolfs)
    pub fn radius(&self) -> f32 {
        // TODO: Improve these values (some might be reliant on more info in inner type)
        match self {
            Body::Humanoid(_) => 0.5,
            Body::QuadrupedSmall(_) => 0.6,
            Body::QuadrupedMedium(_) => 0.9,
            Body::Critter(_) => 0.5,
            Body::BirdMedium(_) => 0.5,
            Body::FishMedium(_) => 0.5,
            Body::Dragon(_) => 2.5,
            Body::BirdSmall(_) => 0.2,
            Body::FishSmall(_) => 0.2,
            Body::BipedLarge(_) => 1.0,
            Body::Object(_) => 0.3,
        }
    }
}

impl Component for Body {
    type Storage = FlaggedStorage<Self, IDVStorage<Self>>;
}