// pathfinder/partitioner/src/mesh_library.rs
//
// Copyright © 2017 The Pathfinder Project Developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use euclid::Point2D;
use std::ops::Range;

use {BQuad, BVertexLoopBlinnData, CurveIndices, LineIndices};

#[derive(Debug, Clone)]
pub struct MeshLibrary {
    pub b_quads: Vec<BQuad>,
    pub b_vertex_positions: Vec<Point2D<f32>>,
    pub b_vertex_path_ids: Vec<u16>,
    pub b_vertex_loop_blinn_data: Vec<BVertexLoopBlinnData>,
    pub cover_indices: MeshLibraryCoverIndices,
    pub edge_indices: MeshLibraryEdgeIndices,
}

impl MeshLibrary {
    #[inline]
    pub fn new() -> MeshLibrary {
        MeshLibrary {
            b_quads: vec![],
            b_vertex_positions: vec![],
            b_vertex_path_ids: vec![],
            b_vertex_loop_blinn_data: vec![],
            cover_indices: MeshLibraryCoverIndices::new(),
            edge_indices: MeshLibraryEdgeIndices::new(),
        }
    }

    pub fn clear(&mut self) {
        self.b_quads.clear();
        self.b_vertex_positions.clear();
        self.b_vertex_path_ids.clear();
        self.b_vertex_loop_blinn_data.clear();
        self.cover_indices.clear();
        self.edge_indices.clear();
    }

    pub(crate) fn snapshot_lengths(&self) -> MeshLibraryLengths {
        MeshLibraryLengths {
            b_quads: self.b_quads.len(),
            b_vertices: self.b_vertex_positions.len(),
            cover_interior_indices: self.cover_indices.interior_indices.len(),
            cover_curve_indices: self.cover_indices.curve_indices.len(),
            edge_upper_line_indices: self.edge_indices.upper_line_indices.len(),
            edge_upper_curve_indices: self.edge_indices.upper_curve_indices.len(),
            edge_lower_line_indices: self.edge_indices.lower_line_indices.len(),
            edge_lower_curve_indices: self.edge_indices.lower_curve_indices.len(),
        }
    }
}

#[derive(Debug, Clone)]
pub struct MeshLibraryCoverIndices {
    pub interior_indices: Vec<u32>,
    pub curve_indices: Vec<u32>,
}

impl MeshLibraryCoverIndices {
    #[inline]
    fn new() -> MeshLibraryCoverIndices {
        MeshLibraryCoverIndices {
            interior_indices: vec![],
            curve_indices: vec![],
        }
    }

    fn clear(&mut self) {
        self.interior_indices.clear();
        self.curve_indices.clear();
    }
}

#[derive(Debug, Clone)]
pub struct MeshLibraryEdgeIndices {
    pub upper_line_indices: Vec<LineIndices>,
    pub upper_curve_indices: Vec<CurveIndices>,
    pub lower_line_indices: Vec<LineIndices>,
    pub lower_curve_indices: Vec<CurveIndices>,
}

impl MeshLibraryEdgeIndices {
    #[inline]
    fn new() -> MeshLibraryEdgeIndices {
        MeshLibraryEdgeIndices {
            upper_line_indices: vec![],
            upper_curve_indices: vec![],
            lower_line_indices: vec![],
            lower_curve_indices: vec![],
        }
    }

    fn clear(&mut self) {
        self.upper_line_indices.clear();
        self.upper_curve_indices.clear();
        self.lower_line_indices.clear();
        self.lower_curve_indices.clear();
    }
}

pub(crate) struct MeshLibraryLengths {
    b_quads: usize,
    b_vertices: usize,
    cover_interior_indices: usize,
    cover_curve_indices: usize,
    edge_upper_line_indices: usize,
    edge_upper_curve_indices: usize,
    edge_lower_line_indices: usize,
    edge_lower_curve_indices: usize,
}

pub struct MeshLibraryIndexRanges {
    pub b_quads: Range<usize>,
    pub b_vertices: Range<usize>,
    pub cover_interior_indices: Range<usize>,
    pub cover_curve_indices: Range<usize>,
    pub edge_upper_line_indices: Range<usize>,
    pub edge_upper_curve_indices: Range<usize>,
    pub edge_lower_line_indices: Range<usize>,
    pub edge_lower_curve_indices: Range<usize>,
}

impl MeshLibraryIndexRanges {
    pub(crate) fn new(start: &MeshLibraryLengths, end: &MeshLibraryLengths)
                      -> MeshLibraryIndexRanges {
        MeshLibraryIndexRanges {
            b_quads: start.b_quads..end.b_quads,
            b_vertices: start.b_vertices..end.b_vertices,
            cover_interior_indices: start.cover_interior_indices..end.cover_interior_indices,
            cover_curve_indices: start.cover_curve_indices..end.cover_curve_indices,
            edge_upper_line_indices: start.edge_upper_line_indices..end.edge_upper_line_indices,
            edge_upper_curve_indices: start.edge_upper_curve_indices..end.edge_upper_curve_indices,
            edge_lower_line_indices: start.edge_lower_line_indices..end.edge_lower_line_indices,
            edge_lower_curve_indices: start.edge_lower_curve_indices..end.edge_lower_curve_indices,
        }
    }
}