//! Native sculpt-map sampling and topology generation.

#![allow(clippy::cast_precision_loss)] // Pixel and grid coordinates are converted to C# Single.
#![allow(clippy::missing_errors_doc)] // Result shapes are fixed by the compatibility map.
#![allow(clippy::must_use_candidate)] // Attributes are not part of the mapped C# surface.
#![allow(clippy::needless_pass_by_value)] // Owned images and rows mirror mapped signatures.
#![allow(clippy::too_many_arguments)] // File and image constructors have fixed signatures.
#![allow(clippy::too_many_lines)] // Topology construction follows the golden sequence directly.

use crate::{Coord, Error, Face, Quat, SculptMeshSculptType, UVCoord, ViewerFace};
use libremetaverse_imaging::{
    DEFAULT_MAX_ENCODED_BYTES, DEFAULT_MAX_PIXELS, ITextureCodec, ManagedImage,
    ManagedImageImageChannels,
};
use std::fs::File;

const MAX_SCULPT_AXIS: usize = 4_096;

#[derive(Clone, Debug, Default, Eq, PartialEq)]
pub struct SculptMap {
    pub blue_bytes: Vec<u8>,
    pub green_bytes: Vec<u8>,
    pub height: i32,
    pub red_bytes: Vec<u8>,
    pub width: i32,
}

impl SculptMap {
    pub fn new_with_constructor() -> Result<Self, Error> {
        Ok(Self::default())
    }

    pub fn new_with_managed_image_int32(image: ManagedImage, lod: i32) -> Result<Self, Error> {
        image.validate()?;
        if lod <= 0 {
            return Err(Error::Argument);
        }
        let original_width = usize::try_from(image.width).map_err(|_| Error::Argument)?;
        let original_height = usize::try_from(image.height).map_err(|_| Error::Argument)?;
        let lod = usize::try_from(lod).map_err(|_| Error::Argument)?;
        let lod_pixels = lod.checked_mul(lod).ok_or(Error::Argument)?;
        let budget_side = lod.checked_mul(2).ok_or(Error::Argument)?;
        let budget_pixels = budget_side
            .checked_mul(budget_side)
            .ok_or(Error::Argument)?;
        let original_pixels = original_width
            .checked_mul(original_height)
            .ok_or(Error::Argument)?;
        let small_map = original_pixels <= lod_pixels;
        let mut width = original_width;
        let mut height = original_height;
        let mut needs_scaling = false;
        while width.checked_mul(height).ok_or(Error::Argument)? > budget_pixels {
            width >>= 1;
            height >>= 1;
            needs_scaling = true;
            if width == 0 || height == 0 {
                return Err(Error::Argument);
            }
        }

        let mut scaled;
        let source = if needs_scaling {
            scaled = image.clone()?;
            scaled.resize_bilinear(to_i32(width)?, to_i32(height)?)?;
            &scaled
        } else {
            &image
        };
        if width.checked_mul(height).ok_or(Error::Argument)? > lod_pixels {
            width >>= 1;
            height >>= 1;
            if width == 0 || height == 0 {
                return Err(Error::Argument);
            }
        }
        let output_width = width
            .checked_add(usize::from(!small_map))
            .ok_or(Error::Argument)?;
        let output_height = height
            .checked_add(usize::from(!small_map))
            .ok_or(Error::Argument)?;
        let bytes = output_width
            .checked_mul(output_height)
            .ok_or(Error::Argument)?;
        if bytes > DEFAULT_MAX_PIXELS
            || output_width > MAX_SCULPT_AXIS
            || output_height > MAX_SCULPT_AXIS
        {
            return Err(Error::Argument);
        }
        let mut result = Self {
            blue_bytes: vec![0; bytes],
            green_bytes: vec![0; bytes],
            height: to_i32(output_height)?,
            red_bytes: vec![0; bytes],
            width: to_i32(output_width)?,
        };
        let mut output = 0usize;
        if small_map {
            for y in 0..height {
                for x in 0..width {
                    let (red, green, blue) = sample_pixel(source, x, y)?;
                    result.red_bytes[output] = red;
                    result.green_bytes[output] = green;
                    result.blue_bytes[output] = blue;
                    output += 1;
                }
            }
        } else {
            for y in 0..=height {
                let source_y = if y < height {
                    y.checked_mul(2)
                } else {
                    y.checked_mul(2).and_then(|n| n.checked_sub(1))
                }
                .ok_or(Error::Argument)?;
                for x in 0..=width {
                    let source_x = if x < width {
                        x.checked_mul(2)
                    } else {
                        x.checked_mul(2).and_then(|n| n.checked_sub(1))
                    }
                    .ok_or(Error::Argument)?;
                    let (red, green, blue) = sample_pixel(source, source_x, source_y)?;
                    result.red_bytes[output] = red;
                    result.green_bytes[output] = green;
                    result.blue_bytes[output] = blue;
                    output += 1;
                }
            }
        }
        Ok(result)
    }

    pub fn to_rows(&self, mirror: bool) -> Result<Vec<Vec<Coord>>, Error> {
        let width = usize::try_from(self.width).map_err(|_| Error::Argument)?;
        let height = usize::try_from(self.height).map_err(|_| Error::Argument)?;
        let pixels = width.checked_mul(height).ok_or(Error::Argument)?;
        if width == 0
            || height == 0
            || pixels > DEFAULT_MAX_PIXELS
            || self.red_bytes.len() != pixels
            || self.green_bytes.len() != pixels
            || self.blue_bytes.len() != pixels
        {
            return Err(Error::InvalidOperation);
        }
        let mut rows = Vec::with_capacity(height);
        for y in 0..height {
            let mut row = Vec::with_capacity(width);
            for x in 0..width {
                let index = y
                    .checked_mul(width)
                    .and_then(|n| n.checked_add(x))
                    .ok_or(Error::Argument)?;
                let red = f32::from(self.red_bytes[index]) / 255.0 - 0.5;
                let green = f32::from(self.green_bytes[index]) / 255.0 - 0.5;
                let blue = f32::from(self.blue_bytes[index]) / 255.0 - 0.5;
                row.push(Coord {
                    x: if mirror { -red } else { red },
                    y: green,
                    z: blue,
                });
            }
            rows.push(row);
        }
        Ok(rows)
    }
}

fn sample_pixel(image: &ManagedImage, x: usize, y: usize) -> Result<(u8, u8, u8), Error> {
    let width = usize::try_from(image.width).map_err(|_| Error::Argument)?;
    let height = usize::try_from(image.height).map_err(|_| Error::Argument)?;
    if x >= width || y >= height {
        return Err(Error::IndexOutOfRange);
    }
    let index = y
        .checked_mul(width)
        .and_then(|n| n.checked_add(x))
        .ok_or(Error::Argument)?;
    let red = *image.red.get(index).ok_or(Error::IndexOutOfRange)?;
    if image.channels.contains(ManagedImageImageChannels::COLOR)
        && image.green.len() == width * height
        && image.blue.len() == width * height
    {
        Ok((red, image.green[index], image.blue[index]))
    } else {
        Ok((red, red, red))
    }
}

#[derive(Clone, Debug, Default, PartialEq)]
pub struct SculptMesh {
    pub coords: Vec<Coord>,
    pub faces: Vec<Face>,
    pub normals: Vec<Coord>,
    pub uvs: Vec<UVCoord>,
    pub viewer_faces: Vec<ViewerFace>,
}

impl SculptMesh {
    pub fn new_with_managed_image_sculpt_type_int32_boolean(
        image: ManagedImage,
        sculpt_type: SculptMeshSculptType,
        lod: i32,
        viewer_mode: bool,
    ) -> Result<Self, Error> {
        Self::new_with_managed_image_sculpt_type_int32_boolean_boolean_boolean(
            image,
            sculpt_type,
            lod,
            viewer_mode,
            false,
            false,
        )
    }

    pub fn new_with_managed_image_sculpt_type_int32_boolean_boolean_boolean(
        image: ManagedImage,
        sculpt_type: SculptMeshSculptType,
        lod: i32,
        viewer_mode: bool,
        mirror: bool,
        invert: bool,
    ) -> Result<Self, Error> {
        let rows = SculptMap::new_with_managed_image_int32(image, lod)?.to_rows(mirror)?;
        Self::new_with_list_sculpt_type_boolean_boolean_boolean(
            rows,
            sculpt_type,
            viewer_mode,
            mirror,
            invert,
        )
    }

    pub fn new_with_sculpt_mesh(mesh: Self) -> Result<Self, Error> {
        Ok(mesh.clone())
    }

    pub fn new_with_list_sculpt_type_boolean_boolean_boolean(
        mut rows: Vec<Vec<Coord>>,
        sculpt_type: SculptMeshSculptType,
        viewer_mode: bool,
        mirror: bool,
        mut invert: bool,
    ) -> Result<Self, Error> {
        validate_rows(&rows)?;
        if mirror {
            invert = !invert;
        }
        let original_width = rows[0].len();
        if sculpt_type != SculptMeshSculptType::Plane {
            if rows.len().is_multiple_of(2) {
                for row in &mut rows {
                    row.push(row[0]);
                }
            } else {
                for row in &mut rows {
                    row[0] = row[original_width - 1];
                }
            }
        }
        let top_pole = rows[0][original_width / 2];
        let bottom_pole = rows[rows.len() - 1][original_width / 2];
        if sculpt_type == SculptMeshSculptType::Sphere {
            if rows.len().is_multiple_of(2) {
                let count = rows[0].len();
                rows.insert(0, vec![top_pole; count]);
                rows.push(vec![bottom_pole; count]);
            } else {
                for coord in &mut rows[0] {
                    *coord = top_pole;
                }
                let last = rows.len() - 1;
                for coord in &mut rows[last] {
                    *coord = bottom_pole;
                }
            }
        }
        if sculpt_type == SculptMeshSculptType::Torus {
            rows.push(rows[0].clone());
        }
        validate_rows(&rows)?;
        let height = rows.len();
        let width = rows[0].len();
        let vertices = width.checked_mul(height).ok_or(Error::Argument)?;
        if vertices > DEFAULT_MAX_PIXELS {
            return Err(Error::Argument);
        }
        let face_count = width
            .checked_sub(1)
            .and_then(|x| height.checked_sub(1).and_then(|y| x.checked_mul(y)))
            .and_then(|n| n.checked_mul(2))
            .ok_or(Error::Argument)?;
        let mut mesh = Self {
            coords: Vec::with_capacity(vertices),
            faces: Vec::with_capacity(face_count),
            normals: if viewer_mode {
                vec![Coord::default(); vertices]
            } else {
                Vec::new()
            },
            uvs: if viewer_mode {
                Vec::with_capacity(vertices)
            } else {
                Vec::new()
            },
            viewer_faces: if viewer_mode {
                Vec::with_capacity(face_count)
            } else {
                Vec::new()
            },
        };
        let width_unit = 1.0 / (width - 1) as f32;
        let height_unit = 1.0 / (height - 1) as f32;
        for (y, row) in rows.iter().enumerate() {
            for (x, coord) in row.iter().copied().enumerate() {
                mesh.coords.push(coord);
                if viewer_mode {
                    mesh.uvs.push(UVCoord {
                        u: width_unit * x as f32,
                        v: height_unit * y as f32,
                    });
                }
                if y > 0 && x > 0 {
                    let p4 = y
                        .checked_mul(width)
                        .and_then(|n| n.checked_add(x))
                        .ok_or(Error::Argument)?;
                    let p3 = p4 - 1;
                    let p2 = p4 - width;
                    let p1 = p3 - width;
                    let (a, b) = if invert {
                        ((p1, p4, p3), (p1, p2, p4))
                    } else {
                        ((p1, p3, p4), (p1, p4, p2))
                    };
                    mesh.faces.push(make_face(a, viewer_mode)?);
                    mesh.faces.push(make_face(b, viewer_mode)?);
                }
            }
        }
        if viewer_mode {
            mesh.calculate_vertex_normals(sculpt_type, width, height)?;
        }
        mesh.validate()?;
        Ok(mesh)
    }

    pub fn new_with_single_array_single_single_single_single_boolean(
        z_map: Vec<f32>,
        x_begin: f32,
        x_end: f32,
        y_begin: f32,
        y_end: f32,
        viewer_mode: bool,
    ) -> Result<Self, Error> {
        if z_map.iter().any(|value| !value.is_finite()) {
            return Err(Error::Argument);
        }
        let side = z_map.len().isqrt();
        if side < 2 || side.checked_mul(side) != Some(z_map.len()) {
            return Err(Error::Argument);
        }
        let rows: Vec<Vec<f32>> = z_map.chunks_exact(side).map(<[f32]>::to_vec).collect();
        Self::from_height_rows(rows, x_begin, x_end, y_begin, y_end, viewer_mode)
    }

    /// Builds the full rectangular form of the C# two-dimensional height-map
    /// constructor. The generated compatibility signature is flattened, so
    /// that entry point accepts square maps and delegates here.
    pub fn from_height_rows(
        z_map: Vec<Vec<f32>>,
        x_begin: f32,
        x_end: f32,
        y_begin: f32,
        y_end: f32,
        viewer_mode: bool,
    ) -> Result<Self, Error> {
        let height = z_map.len();
        let width = z_map.first().map(Vec::len).ok_or(Error::Argument)?;
        if width < 2
            || height < 2
            || width > MAX_SCULPT_AXIS
            || height > MAX_SCULPT_AXIS
            || z_map.iter().any(|row| row.len() != width)
            || z_map.iter().flatten().any(|value| !value.is_finite())
        {
            return Err(Error::Argument);
        }
        let x_step = (x_end - x_begin) / (width - 1) as f32;
        let y_step = (y_end - y_begin) / (height - 1) as f32;
        let rows: Vec<Vec<Coord>> = (0..height)
            .map(|y| {
                (0..width)
                    .map(|x| Coord {
                        x: x_begin + x as f32 * x_step,
                        y: y_begin + y as f32 * y_step,
                        z: z_map[y][x],
                    })
                    .collect()
            })
            .collect();
        let mut mesh = Self::new_with_list_sculpt_type_boolean_boolean_boolean(
            rows,
            SculptMeshSculptType::Plane,
            viewer_mode,
            false,
            true,
        )?;
        if viewer_mode {
            for uv in &mut mesh.uvs {
                uv.v = 1.0 - uv.v;
            }
            for face in &mut mesh.viewer_faces {
                face.uv1.v = 1.0 - face.uv1.v;
                face.uv2.v = 1.0 - face.uv2.v;
                face.uv3.v = 1.0 - face.uv3.v;
            }
        }
        Ok(mesh)
    }

    pub fn new_with_string_i_texture_codec_int32_int32_int32_int32_int32(
        file_name: String,
        codec: Box<dyn ITextureCodec>,
        sculpt_type: i32,
        lod: i32,
        viewer_mode: i32,
        mirror: i32,
        invert: i32,
    ) -> Result<Self, Error> {
        let kind = sculpt_type_from_i32(sculpt_type)?;
        let image = decode_file(&file_name, codec.as_ref())?;
        Self::new_with_managed_image_sculpt_type_int32_boolean_boolean_boolean(
            image,
            kind,
            lod,
            viewer_mode != 0,
            mirror != 0,
            invert != 0,
        )
    }

    pub fn sculpt_mesh_from_file(
        &self,
        file_name: String,
        codec: Box<dyn ITextureCodec>,
        sculpt_type: SculptMeshSculptType,
        lod: i32,
        viewer_mode: bool,
    ) -> Result<Self, Error> {
        let image = decode_file(&file_name, codec.as_ref())?;
        Self::new_with_managed_image_sculpt_type_int32_boolean(image, sculpt_type, lod, viewer_mode)
    }

    fn calculate_vertex_normals(
        &mut self,
        sculpt_type: SculptMeshSculptType,
        width: usize,
        height: usize,
    ) -> Result<(), Error> {
        for face in &self.faces {
            let normal = face_normal(&self.coords, *face)?;
            for index in [face.n1, face.n2, face.n3] {
                let index = checked_index(index, self.normals.len())?;
                self.normals[index] = Coord::add(self.normals[index], normal);
            }
        }
        for normal in &mut self.normals {
            normal.normalize()?;
        }
        if sculpt_type != SculptMeshSculptType::Plane {
            for y in 0..height {
                let first = y.checked_mul(width).ok_or(Error::Argument)?;
                let last = first.checked_add(width - 1).ok_or(Error::Argument)?;
                let mut normal = Coord::add(self.normals[first], self.normals[last]);
                normal.normalize()?;
                self.normals[first] = normal;
                self.normals[last] = normal;
            }
        }
        for face in &self.faces {
            let mut viewer = ViewerFace::new(0)?;
            viewer.v1 = self.coords[checked_index(face.v1, self.coords.len())?];
            viewer.v2 = self.coords[checked_index(face.v2, self.coords.len())?];
            viewer.v3 = self.coords[checked_index(face.v3, self.coords.len())?];
            viewer.coord_index1 = face.v1;
            viewer.coord_index2 = face.v2;
            viewer.coord_index3 = face.v3;
            viewer.n1 = self.normals[checked_index(face.n1, self.normals.len())?];
            viewer.n2 = self.normals[checked_index(face.n2, self.normals.len())?];
            viewer.n3 = self.normals[checked_index(face.n3, self.normals.len())?];
            viewer.uv1 = self.uvs[checked_index(face.uv1, self.uvs.len())?];
            viewer.uv2 = self.uvs[checked_index(face.uv2, self.uvs.len())?];
            viewer.uv3 = self.uvs[checked_index(face.uv3, self.uvs.len())?];
            self.viewer_faces.push(viewer);
        }
        Ok(())
    }

    fn validate(&self) -> Result<(), Error> {
        if self
            .coords
            .iter()
            .any(|coord| !coord.x.is_finite() || !coord.y.is_finite() || !coord.z.is_finite())
            || self
                .normals
                .iter()
                .any(|coord| !coord.x.is_finite() || !coord.y.is_finite() || !coord.z.is_finite())
            || self
                .uvs
                .iter()
                .any(|uv| !uv.u.is_finite() || !uv.v.is_finite())
        {
            return Err(Error::InvalidOperation);
        }
        for face in &self.faces {
            checked_index(face.v1, self.coords.len())?;
            checked_index(face.v2, self.coords.len())?;
            checked_index(face.v3, self.coords.len())?;
        }
        Ok(())
    }

    pub fn copy(&self) -> Result<Self, Error> {
        Ok(self.clone())
    }

    pub fn add_pos(&mut self, x: f32, y: f32, z: f32) -> Result<(), Error> {
        for coord in &mut self.coords {
            coord.x += x;
            coord.y += y;
            coord.z += z;
        }
        for face in &mut self.viewer_faces {
            face.add_pos(x, y, z)?;
        }
        Ok(())
    }

    pub fn add_rot(&mut self, q: Quat) -> Result<(), Error> {
        for coord in &mut self.coords {
            *coord = Coord::mul_with_coord_quat(*coord, q);
        }
        for normal in &mut self.normals {
            *normal = Coord::mul_with_coord_quat(*normal, q);
        }
        for face in &mut self.viewer_faces {
            face.add_rot(q)?;
        }
        Ok(())
    }

    pub fn scale(&mut self, x: f32, y: f32, z: f32) -> Result<(), Error> {
        let multiplier = Coord { x, y, z };
        for coord in &mut self.coords {
            *coord = Coord::mul_with_coord_coord(*coord, multiplier);
        }
        for face in &mut self.viewer_faces {
            face.scale(x, y, z)?;
        }
        Ok(())
    }

    pub fn dump_raw(&self, path: String, name: String, title: String) -> Result<(), Error> {
        crate::prim_mesher::dump_raw_geometry(&self.coords, &self.faces, path, name, title)
    }
}

fn validate_rows(rows: &[Vec<Coord>]) -> Result<(), Error> {
    let width = rows.first().map(Vec::len).ok_or(Error::Argument)?;
    if rows.len() < 2 || width < 2 || rows.len() > MAX_SCULPT_AXIS || width > MAX_SCULPT_AXIS {
        return Err(Error::Argument);
    }
    if rows.iter().any(|row| row.len() != width)
        || rows
            .iter()
            .flatten()
            .any(|coord| !coord.x.is_finite() || !coord.y.is_finite() || !coord.z.is_finite())
    {
        return Err(Error::Argument);
    }
    Ok(())
}

fn make_face(indices: (usize, usize, usize), viewer_mode: bool) -> Result<Face, Error> {
    let (v1, v2, v3) = (to_i32(indices.0)?, to_i32(indices.1)?, to_i32(indices.2)?);
    Ok(if viewer_mode {
        Face {
            v1,
            v2,
            v3,
            n1: v1,
            n2: v2,
            n3: v3,
            uv1: v1,
            uv2: v2,
            uv3: v3,
            ..Face::default()
        }
    } else {
        Face {
            v1,
            v2,
            v3,
            ..Face::default()
        }
    })
}

fn face_normal(coords: &[Coord], face: Face) -> Result<Coord, Error> {
    let first = coords[checked_index(face.v1, coords.len())?];
    let second = coords[checked_index(face.v2, coords.len())?];
    let third = coords[checked_index(face.v3, coords.len())?];
    let edge1 = Coord {
        x: second.x - first.x,
        y: second.y - first.y,
        z: second.z - first.z,
    };
    let edge2 = Coord {
        x: third.x - first.x,
        y: third.y - first.y,
        z: third.z - first.z,
    };
    let mut normal = Coord::cross(edge1, edge2)?;
    normal.normalize()?;
    Ok(normal)
}

fn checked_index(index: i32, len: usize) -> Result<usize, Error> {
    let index = usize::try_from(index).map_err(|_| Error::IndexOutOfRange)?;
    if index < len {
        Ok(index)
    } else {
        Err(Error::IndexOutOfRange)
    }
}

fn to_i32(value: usize) -> Result<i32, Error> {
    i32::try_from(value).map_err(|_| Error::Argument)
}

fn sculpt_type_from_i32(value: i32) -> Result<SculptMeshSculptType, Error> {
    match value & 0x07 {
        1 => Ok(SculptMeshSculptType::Sphere),
        2 => Ok(SculptMeshSculptType::Torus),
        3 => Ok(SculptMeshSculptType::Plane),
        4 => Ok(SculptMeshSculptType::Cylinder),
        _ => Err(Error::Argument),
    }
}

fn decode_file(path: &str, codec: &dyn ITextureCodec) -> Result<ManagedImage, Error> {
    let file = File::open(path).map_err(|_| Error::InvalidOperation)?;
    let length = file.metadata().map_err(|_| Error::InvalidOperation)?.len();
    if length > DEFAULT_MAX_ENCODED_BYTES as u64 {
        return Err(Error::Argument);
    }
    codec.decode(Box::new(file))
}

#[cfg(test)]
mod tests {
    use super::*;
    use libremetaverse_types::compat::ReadWrite;
    use std::fmt::Write as _;
    use std::fs;
    use std::io::Read;

    fn grid(width: usize, height: usize) -> Vec<Vec<Coord>> {
        (0..height)
            .map(|y| {
                (0..width)
                    .map(|x| Coord {
                        x: x as f32,
                        y: y as f32,
                        z: (x + y) as f32 * 0.1,
                    })
                    .collect()
            })
            .collect()
    }

    #[test]
    fn sculpt_map_sampling_matches_reference_grid_and_gray_rules() {
        let mut image =
            ManagedImage::new(4, 4, ManagedImageImageChannels::COLOR).expect("color image");
        for index in 0..16 {
            image.red[index] = u8::try_from(index).expect("sample");
            image.green[index] = u8::try_from(index + 20).expect("sample");
            image.blue[index] = u8::try_from(index + 40).expect("sample");
        }
        let map = SculptMap::new_with_managed_image_int32(image, 2).expect("sculpt map");
        assert_eq!((map.width, map.height), (3, 3));
        assert_eq!(map.red_bytes, vec![0, 2, 3, 8, 10, 11, 12, 14, 15]);
        assert_eq!(map.green_bytes[4], 30);
        assert_eq!(map.blue_bytes[8], 55);

        let mut gray =
            ManagedImage::new(2, 2, ManagedImageImageChannels::GRAY).expect("gray image");
        gray.red = vec![0, 64, 128, 255];
        let map = SculptMap::new_with_managed_image_int32(gray, 4).expect("small map");
        assert_eq!(map.red_bytes, map.green_bytes);
        assert_eq!(map.red_bytes, map.blue_bytes);
        let rows = map.to_rows(true).expect("mirrored rows");
        assert!((rows[0][0].x - 0.5).abs() < f32::EPSILON);
        assert!((rows[1][1].z - 0.5).abs() < f32::EPSILON);
    }

    #[test]
    fn topology_modes_match_golden_counts_and_seams() {
        let plane = SculptMesh::new_with_list_sculpt_type_boolean_boolean_boolean(
            grid(3, 3),
            SculptMeshSculptType::Plane,
            true,
            false,
            false,
        )
        .expect("plane");
        assert_eq!(
            (
                plane.coords.len(),
                plane.faces.len(),
                plane.normals.len(),
                plane.uvs.len(),
                plane.viewer_faces.len(),
            ),
            (9, 8, 9, 9, 8)
        );

        let sphere = SculptMesh::new_with_list_sculpt_type_boolean_boolean_boolean(
            grid(4, 4),
            SculptMeshSculptType::Sphere,
            true,
            false,
            false,
        )
        .expect("sphere");
        assert_eq!((sphere.coords.len(), sphere.faces.len()), (30, 40));
        assert_eq!(sphere.coords[0], sphere.coords[4]);
        assert_eq!(sphere.coords[25], sphere.coords[29]);

        let torus = SculptMesh::new_with_list_sculpt_type_boolean_boolean_boolean(
            grid(4, 4),
            SculptMeshSculptType::Torus,
            true,
            false,
            false,
        )
        .expect("torus");
        assert_eq!((torus.coords.len(), torus.faces.len()), (25, 32));
        assert_eq!(&torus.coords[0..5], &torus.coords[20..25]);

        let cylinder = SculptMesh::new_with_list_sculpt_type_boolean_boolean_boolean(
            grid(4, 4),
            SculptMeshSculptType::Cylinder,
            false,
            false,
            false,
        )
        .expect("cylinder");
        assert_eq!((cylinder.coords.len(), cylinder.faces.len()), (20, 24));
    }

    #[test]
    fn copy_transforms_and_flat_height_map_are_real_operations() {
        let mut mesh = SculptMesh::new_with_single_array_single_single_single_single_boolean(
            vec![0.0, 0.0, 0.0, 1.0],
            -1.0,
            1.0,
            -1.0,
            1.0,
            true,
        )
        .expect("height map");
        assert_eq!((mesh.coords.len(), mesh.faces.len()), (4, 2));
        assert_eq!((mesh.uvs[0].v, mesh.uvs[3].v), (1.0, 0.0));
        let original = mesh.coords[0];
        let copy = mesh.copy().expect("copy");
        mesh.add_pos(2.0, 3.0, 4.0).expect("translate");
        mesh.scale(2.0, 0.5, 1.0).expect("scale");
        mesh.add_rot(
            Quat::new_with_single_single_single_single(0.0, 0.0, 0.0, 1.0).expect("identity"),
        )
        .expect("rotate");
        assert_eq!(copy.coords[0], original);
        assert_ne!(mesh.coords[0], copy.coords[0]);
        assert_eq!(mesh.viewer_faces.len(), 2);

        let rectangular = SculptMesh::from_height_rows(
            vec![vec![0.0, 0.5, 1.0], vec![1.0, 0.5, 0.0]],
            0.0,
            2.0,
            0.0,
            1.0,
            false,
        )
        .expect("rectangular height map");
        assert_eq!((rectangular.coords.len(), rectangular.faces.len()), (6, 4));
    }

    struct FixedCodec;

    impl ITextureCodec for FixedCodec {
        fn decode(
            &self,
            mut stream: Box<dyn ReadWrite + Send>,
        ) -> Result<ManagedImage, libremetaverse_imaging::Error> {
            let mut marker = Vec::new();
            stream
                .read_to_end(&mut marker)
                .map_err(|_| libremetaverse_imaging::Error::InvalidOperation)?;
            if marker != b"sculpt" {
                return Err(libremetaverse_imaging::Error::Parse {
                    position: 0,
                    context: "test sculpt",
                });
            }
            let mut image = ManagedImage::new(2, 2, ManagedImageImageChannels::GRAY)?;
            image.red = vec![0, 64, 128, 255];
            Ok(image)
        }
    }

    #[test]
    fn file_constructor_decodes_through_imaging_abstraction_and_raw_is_stable() {
        let directory = std::env::temp_dir();
        let stem = format!("metacrate-sculpt-{}", std::process::id());
        let input = directory.join(format!("{stem}.map"));
        fs::write(&input, b"sculpt").expect("write fixture");
        let mesh = SculptMesh::new_with_string_i_texture_codec_int32_int32_int32_int32_int32(
            input.to_string_lossy().into_owned(),
            Box::new(FixedCodec),
            SculptMeshSculptType::Plane as i32,
            4,
            1,
            0,
            0,
        )
        .expect("decoded sculpt");
        assert_eq!(
            (mesh.coords.len(), mesh.faces.len(), mesh.viewer_faces.len()),
            (4, 2, 2)
        );
        mesh.dump_raw(
            directory.to_string_lossy().into_owned(),
            stem.clone(),
            "golden".to_owned(),
        )
        .expect("raw output");
        let output = directory.join(format!("{stem}_golden.raw"));
        let raw = fs::read_to_string(&output).expect("raw contents");
        assert_eq!(raw.lines().count(), 2);
        let mut expected = String::new();
        for face in &mesh.faces {
            writeln!(
                expected,
                "{} {} {}",
                mesh.coords[usize::try_from(face.v1).expect("index")],
                mesh.coords[usize::try_from(face.v2).expect("index")],
                mesh.coords[usize::try_from(face.v3).expect("index")],
            )
            .expect("format raw");
        }
        assert_eq!(raw, expected);
        fs::remove_file(input).expect("remove fixture");
        fs::remove_file(output).expect("remove output");
    }

    #[test]
    fn malformed_maps_rows_and_height_maps_return_typed_errors() {
        let malformed = SculptMap {
            width: 2,
            height: 2,
            red_bytes: vec![0; 3],
            green_bytes: vec![0; 4],
            blue_bytes: vec![0; 4],
        };
        assert_eq!(malformed.to_rows(false), Err(Error::InvalidOperation));
        assert!(matches!(
            SculptMesh::new_with_list_sculpt_type_boolean_boolean_boolean(
                vec![vec![Coord::default(); 2], vec![Coord::default(); 3]],
                SculptMeshSculptType::Plane,
                false,
                false,
                false,
            ),
            Err(Error::Argument)
        ));
        assert!(matches!(
            SculptMesh::new_with_single_array_single_single_single_single_boolean(
                vec![0.0; 6],
                0.0,
                1.0,
                0.0,
                1.0,
                false,
            ),
            Err(Error::Argument)
        ));
    }
}