jagua-rs 0.7.2

use std::sync::Arc;

use itertools::Itertools;

use crate::collision_detection::hazards::Hazard;
use crate::collision_detection::hazards::HazardEntity;
use crate::collision_detection::{CDEConfig, CDEngine};
use crate::geometry::OriginalShape;
use crate::geometry::primitives::SPolygon;

use anyhow::{Result, ensure};

/// A container in which [`Item`](crate::entities::Item)'s can be placed.
#[derive(Clone, Debug)]
pub struct Container {
    /// Unique identifier of the container
    pub id: usize,
    /// Original contour of the container as defined in the input
    pub outer_orig: Arc<OriginalShape>,
    /// Contour of the container to be used for collision detection
    pub outer_cd: Arc<SPolygon>,
    /// Zones of different qualities in the container, stored per quality.
    pub quality_zones: [Option<InferiorQualityZone>; N_QUALITIES],
    /// The initial state of the `CDEngine` for this container. (equivalent to an empty layout using this container)
    pub base_cde: Arc<CDEngine>,
}

impl Container {
    pub fn new(
        id: usize,
        original_outer: OriginalShape,
        quality_zones: Vec<InferiorQualityZone>,
        cde_config: CDEConfig,
    ) -> Result<Self> {
        let outer = Arc::new(original_outer.convert_to_internal()?);
        let outer_orig = Arc::new(original_outer);
        ensure!(
            quality_zones.len() == quality_zones.iter().map(|qz| qz.quality).unique().count(),
            "Quality zones must have unique qualities"
        );
        ensure!(
            quality_zones
                .iter()
                .map(|qz| qz.quality)
                .all(|q| q < N_QUALITIES),
            "All quality zones must be below N_QUALITIES: {N_QUALITIES}"
        );
        let quality_zones = {
            let mut qz = <[_; N_QUALITIES]>::default();
            for q in quality_zones {
                let quality = q.quality;
                qz[quality] = Some(q);
            }
            qz
        };

        let base_cde = {
            let mut hazards = vec![Hazard::new(HazardEntity::Exterior, outer.clone(), false)];
            let qz_hazards = quality_zones
                .iter()
                .flatten()
                .flat_map(|qz| qz.to_hazards());
            hazards.extend(qz_hazards);
            let base_cde = CDEngine::new(outer.bbox.inflate_to_square(), hazards, cde_config);
            Arc::new(base_cde)
        };

        Ok(Self {
            id,
            outer_cd: outer,
            outer_orig,
            quality_zones,
            base_cde,
        })
    }

    /// The area of the contour of the container, excluding holes
    pub fn area(&self) -> f32 {
        self.outer_orig.area() - self.quality_zones[0].as_ref().map_or(0.0, |qz| qz.area())
    }
}

/// Maximum number of qualities that can be used for quality zones in a container.
pub const N_QUALITIES: usize = 10;

/// Represents a zone of inferior quality in the [`Container`]
#[derive(Clone, Debug)]
pub struct InferiorQualityZone {
    /// Quality of this zone. Higher qualities are superior. A zone with quality 0 is treated as a hole.
    pub quality: usize,
    /// Contours of this quality-zone as defined in the input file
    pub shapes_orig: Vec<Arc<OriginalShape>>,
    /// Contours of this quality-zone to be used for collision detection
    pub shapes_cd: Vec<Arc<SPolygon>>,
}

impl InferiorQualityZone {
    pub fn new(quality: usize, original_shapes: Vec<OriginalShape>) -> Result<Self> {
        assert!(
            quality < N_QUALITIES,
            "Quality must be in range of N_QUALITIES"
        );
        let shapes: Result<Vec<Arc<SPolygon>>> = original_shapes
            .iter()
            .map(|orig| orig.convert_to_internal().map(Arc::new))
            .collect();

        let original_shapes = original_shapes.into_iter().map(Arc::new).collect_vec();

        Ok(Self {
            quality,
            shapes_cd: shapes?,
            shapes_orig: original_shapes,
        })
    }

    /// Returns the set of hazards induced by this zone.
    pub fn to_hazards(&self) -> impl Iterator<Item = Hazard> {
        self.shapes_cd.iter().enumerate().map(|(idx, shape)| {
            let entity = match self.quality {
                0 => HazardEntity::Hole { idx },
                _ => HazardEntity::InferiorQualityZone {
                    quality: self.quality,
                    idx,
                },
            };
            Hazard::new(entity, shape.clone(), false)
        })
    }

    pub fn area(&self) -> f32 {
        self.shapes_orig.iter().map(|shape| shape.area()).sum()
    }
}