/// This module contains functions for modifying solids, e.g., by adding a fillet or chamfer, or
/// removing part of a solid.

@no_std
@settings(defaultLengthUnit = mm, kclVersion = 1.0)

import Face from "std::types"

/// Blend a transitional edge along a tagged path, smoothing the sharp edge.
///
/// Fillet is similar in function and use to a chamfer, except
/// a chamfer will cut a sharp transition along an edge while fillet
/// will smoothly blend the transition.
///
/// ```
/// width = 20
/// length = 10
/// thickness = 1
/// filletRadius = 2
///
/// mountingPlateSketch = startSketchOn(XY)
///   |> startProfile(at = [-width/2, -length/2])
///   |> line(endAbsolute = [width/2, -length/2], tag = $edge1)
///   |> line(endAbsolute = [width/2, length/2], tag = $edge2)
///   |> line(endAbsolute = [-width/2, length/2], tag = $edge3)
///   |> close(tag = $edge4)
///
/// mountingPlate = extrude(mountingPlateSketch, length = thickness)
///   |> fillet(
///     radius = filletRadius,
///     tags = [
///       getNextAdjacentEdge(edge1),
///       getNextAdjacentEdge(edge2),
///       getNextAdjacentEdge(edge3),
///       getNextAdjacentEdge(edge4)
///     ],
///   )
/// ```
///
/// ```
/// width = 20
/// length = 10
/// thickness = 1
/// filletRadius = 1
///
/// mountingPlateSketch = startSketchOn(XY)
///   |> startProfile(at = [-width/2, -length/2])
///   |> line(endAbsolute = [width/2, -length/2], tag = $edge1)
///   |> line(endAbsolute = [width/2, length/2], tag = $edge2)
///   |> line(endAbsolute = [-width/2, length/2], tag = $edge3)
///   |> close(tag = $edge4)
///
/// mountingPlate = extrude(mountingPlateSketch, length = thickness)
///   |> fillet(
///     radius = filletRadius,
///     tolerance = 0.000001,
///     tags = [
///       getNextAdjacentEdge(edge1),
///       getNextAdjacentEdge(edge2),
///       getNextAdjacentEdge(edge3),
///       getNextAdjacentEdge(edge4)
///     ],
///   )
/// ```
@(impl = std_rust)
export fn fillet(
  /// The solid whose edges should be filletted
  @solid: Solid,
  /// The radius of the fillet
  radius: number(Length),
  /// The paths you want to fillet
  tags: [Edge; 1+],
  /// The tolerance for this fillet
  tolerance?: number(Length),
  /// Create a new tag which refers to this fillet
  tag?: tag,
): Solid {}

/// Cut a straight transitional edge along a tagged path.
///
/// Chamfer is similar in function and use to a fillet, except
/// a fillet will blend the transition along an edge, rather than cut
/// a sharp, straight transitional edge.
///
/// ```
/// // Chamfer a mounting plate.
/// width = 20
/// length = 10
/// thickness = 1
/// chamferLength = 2
///
/// mountingPlateSketch = startSketchOn(XY)
///   |> startProfile(at = [-width/2, -length/2])
///   |> line(endAbsolute = [width/2, -length/2], tag = $edge1)
///   |> line(endAbsolute = [width/2, length/2], tag = $edge2)
///   |> line(endAbsolute = [-width/2, length/2], tag = $edge3)
///   |> close(tag = $edge4)
///
/// mountingPlate = extrude(mountingPlateSketch, length = thickness)
///   |> chamfer(
///     length = chamferLength,
///     tags = [
///       getNextAdjacentEdge(edge1),
///       getNextAdjacentEdge(edge2),
///       getNextAdjacentEdge(edge3),
///       getNextAdjacentEdge(edge4)
///     ],
///   )
/// ```
///
/// ```
/// // Sketch on the face of a chamfer.
/// fn cube(pos, scale) {
/// sg = startSketchOn(XY)
///     |> startProfile(at = pos)
///     |> line(end = [0, scale])
///     |> line(end = [scale, 0])
///     |> line(end = [0, -scale])
///
///     return sg
/// }
///
/// part001 = cube(pos = [0,0], scale = 20)
///     |> close(tag = $line1)
///     |> extrude(length = 20)
///     // We tag the chamfer to reference it later.
///     |> chamfer(
///         length = 10,
///         tags = [getOppositeEdge(line1)],
///         tag = $chamfer1,
///     )  
///
/// sketch001 = startSketchOn(part001, face = chamfer1)
///     |> startProfile(at = [10, 10])
///     |> line(end = [2, 0])
///     |> line(end = [0, 2])
///     |> line(end = [-2, 0])
///     |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
///     |> close()
///     |> extrude(length = 10)
/// ```
@(impl = std_rust)
export fn chamfer(
  /// The solid whose edges should be chamfered
  @solid: Solid,
  /// The length of the chamfer
  length: number(Length),
  /// The paths you want to chamfer
  tags: [Edge; 1+],
  /// Create a new tag which refers to this chamfer
  tag?: tag,
): Solid {}

/// Remove volume from a 3-dimensional shape such that a wall of the
/// provided thickness remains, taking volume starting at the provided
/// face, leaving it open in that direction.
///
/// ```
/// // Remove the end face for the extrusion.
/// firstSketch = startSketchOn(XY)
///     |> startProfile(at = [-12, 12])
///     |> line(end = [24, 0])
///     |> line(end = [0, -24])
///     |> line(end = [-24, 0])
///     |> close()
///     |> extrude(length = 6)
///
/// // Remove the end face for the extrusion.
/// shell(
///     firstSketch,
///     faces = [END],
///     thickness = 0.25,
/// )
/// ```
///
/// ```
/// // Remove the start face for the extrusion.
/// firstSketch = startSketchOn(-XZ)
///     |> startProfile(at = [-12, 12])
///     |> line(end = [24, 0])
///     |> line(end = [0, -24])
///     |> line(end = [-24, 0])
///     |> close()
///     |> extrude(length = 6)
///
/// // Remove the start face for the extrusion.
/// shell(
///     firstSketch,
///     faces = [START],
///     thickness = 0.25,
/// )
/// ```
///
/// ```
/// // Remove a tagged face and the end face for the extrusion.
/// firstSketch = startSketchOn(XY)
///     |> startProfile(at = [-12, 12])
///     |> line(end = [24, 0])
///     |> line(end = [0, -24])
///     |> line(end = [-24, 0], tag = $myTag)
///     |> close()
///     |> extrude(length = 6)
///
/// // Remove a tagged face for the extrusion.
/// shell(
///     firstSketch,
///     faces = [myTag],
///     thickness = 0.25,
/// )
/// ```
///
/// ```
/// // Remove multiple faces at once.
/// firstSketch = startSketchOn(XY)
///     |> startProfile(at = [-12, 12])
///     |> line(end = [24, 0])
///     |> line(end = [0, -24])
///     |> line(end = [-24, 0], tag = $myTag)
///     |> close()
///     |> extrude(length = 6)
///
/// // Remove a tagged face and the end face for the extrusion.
/// shell(
///     firstSketch,
///     faces = [myTag, END],
///     thickness = 0.25,
/// )
/// ```
///
/// ```
/// // Shell a sketch on face.
/// size = 100
/// case = startSketchOn(-XZ)
///     |> startProfile(at = [-size, -size])
///     |> line(end = [2 * size, 0])
///     |> line(end = [0, 2 * size])
///     |> tangentialArc(endAbsolute = [-size, size])
///     |> close()
///     |> extrude(length = 65)
///
/// thing1 = startSketchOn(case, face = END)
///     |> circle( center = [-size / 2, -size / 2], radius = 25 )
///     |> extrude(length = 50)
///
/// thing2 = startSketchOn(case, face = END)
///     |> circle( center = [size / 2, -size / 2], radius = 25 )
///     |> extrude(length = 50)
///
/// // We put "case" in the shell function to shell the entire object.
/// shell(case, faces = [START], thickness = 5)
/// ```
///
/// ```
/// // Shell a sketch on face object on the end face.
/// size = 100
/// case = startSketchOn(XY)
///     |> startProfile(at = [-size, -size])
///     |> line(end = [2 * size, 0])
///     |> line(end = [0, 2 * size])
///     |> tangentialArc(endAbsolute = [-size, size])
///     |> close()
///     |> extrude(length = 65)
///
/// thing1 = startSketchOn(case, face = END)
///     |> circle( center = [-size / 2, -size / 2], radius = 25 )
///     |> extrude(length = 50)
///
/// thing2 = startSketchOn(case, face = END)
///     |> circle( center = [size / 2, -size / 2], radius = 25 )
///     |> extrude(length = 50)
///
/// // We put "thing1" in the shell function to shell the end face of the object.
/// shell(thing1, faces = [END], thickness = 5)
/// ```
///
/// ```
/// // Shell sketched on face objects on the end face, include all sketches to shell
/// // the entire object.
///
/// size = 100
/// case = startSketchOn(XY)
///     |> startProfile(at = [-size, -size])
///     |> line(end = [2 * size, 0])
///     |> line(end = [0, 2 * size])
///     |> tangentialArc(endAbsolute = [-size, size])
///     |> close()
///     |> extrude(length = 65)
///
/// thing1 = startSketchOn(case, face = END)
///     |> circle( center = [-size / 2, -size / 2], radius = 25 )
///     |> extrude(length = 50)
///
/// thing2 = startSketchOn(case, face = END)
///     |> circle( center = [size / 2, -size / 2], radius = 25)
///     |> extrude(length = 50)
///
/// // We put "thing1" and "thing2" in the shell function to shell the end face of the object.
/// shell([thing1, thing2], faces = [END], thickness = 5)
/// ```
@(impl = std_rust)
export fn shell(
  /// Which solid (or solids) to shell out
  @solids: [Solid; 1+],
  /// The thickness of the shell
  thickness: number(Length),
  /// The faces you want removed
  faces: [tag; 1+],
): [Solid] {}


/// Make the inside of a 3D object hollow.
///
/// Remove volume from a 3-dimensional shape such that a wall of the
/// provided thickness remains around the exterior of the shape.
///
/// ```
/// // Hollow a basic sketch.
/// firstSketch = startSketchOn(XY)
///     |> startProfile(at = [-12, 12])
///     |> line(end = [24, 0])
///     |> line(end = [0, -24])
///     |> line(end = [-24, 0])
///     |> close()
///     |> extrude(length = 6)
///     |> hollow (thickness = 0.25)
/// ```
///
/// ```
/// // Hollow a basic sketch.
/// firstSketch = startSketchOn(-XZ)
///     |> startProfile(at = [-12, 12])
///     |> line(end = [24, 0])
///     |> line(end = [0, -24])
///     |> line(end = [-24, 0])
///     |> close()
///     |> extrude(length = 6)
///     |> hollow (thickness = 0.5)
/// ```
///
/// ```
/// // Hollow a sketch on face object.
/// size = 100
/// case = startSketchOn(-XZ)
///     |> startProfile(at = [-size, -size])
///     |> line(end = [2 * size, 0])
///     |> line(end = [0, 2 * size])
///     |> tangentialArc(endAbsolute = [-size, size])
///     |> close()
///     |> extrude(length = 65)
///
/// thing1 = startSketchOn(case, face = END)
///     |> circle( center = [-size / 2, -size / 2], radius = 25 )
///     |> extrude(length = 50)
///
/// thing2 = startSketchOn(case, face = END)
///     |> circle( center = [size / 2, -size / 2], radius = 25 )
///     |> extrude(length = 50)
///
/// hollow(case, thickness = 0.5)
/// ```
@(impl = std_rust)
export fn hollow(
  /// Which solid to hollow out
  @solid: Solid,
  /// The thickness of the remaining shell
  thickness: number(Length),
): Solid {}

/// Repeat a 3-dimensional solid, changing it each time.
///
/// Replicates the 3D solid, applying a transformation function to each replica.
/// Transformation function could alter rotation, scale, visibility, position, etc.
///
/// The `patternTransform` call itself takes a number for how many total instances of
/// the shape should be. For example, if you use a circle with `patternTransform(instances = 4, transform = f)`
/// then there will be 4 circles: the original, and 3 created by replicating the original and
/// calling the transform function on each.
///
/// The transform function takes a single parameter: an integer representing which
/// number replication the transform is for. E.g. the first replica to be transformed
/// will be passed the argument `1`. This simplifies your math: the transform function can
/// rely on id `0` being the original instance passed into the `patternTransform`. See the examples.
///
/// The transform function returns a transform object. All properties of the object are optional,
/// they each default to "no change". So the overall transform object defaults to "no change" too.
/// Its properties are:
///
///  - `translate` (3D point)
///
///    Translates the replica, moving its position in space.      
///
///  - `replicate` (bool)
///
///    If false, this ID will not actually copy the object. It'll be skipped.
///
///  - `scale` (3D point)
///
///    Stretches the object, multiplying its width in the given dimension by the point's component in
///    that direction.      
///
///  - `rotation` (object, with the following properties)
///
///    - `rotation.axis` (a 3D point, defaults to the Z axis)
///
///    - `rotation.angle` (number of degrees)
///
///    - `rotation.origin` (either "local" i.e. rotate around its own center, "global" i.e. rotate around the scene's center, or a 3D point, defaults to "local")
///
/// ```kcl
/// // Each instance will be shifted along the X axis.
/// fn transform(@id) {
///   return { translate = [4 * id, 0, 0] }
/// }
///
/// // Sketch 4 cylinders.
/// sketch001 = startSketchOn(XZ)
///   |> circle(center = [0, 0], radius = 2)
///   |> extrude(length = 5)
///   |> patternTransform(instances = 4, transform = transform)
/// ```
///
/// ```kcl
/// // Each instance will be shifted along the X axis,
/// // with a gap between the original (at x = 0) and the first replica
/// // (at x = 8). This is because `id` starts at 1.
/// fn transform(@id) {
///   return { translate = [4 * (1+id), 0, 0] }
/// }
///
/// sketch001 = startSketchOn(XZ)
///   |> circle(center = [0, 0], radius = 2)
///   |> extrude(length = 5)
///   |> patternTransform(instances = 4, transform = transform)
/// ```
///
/// ```kcl
/// fn cube(length, center) {
///   l = length/2
///   x = center[0]
///   y = center[1]
///   p0 = [-l + x, -l + y]
///   p1 = [-l + x,  l + y]
///   p2 = [ l + x,  l + y]
///   p3 = [ l + x, -l + y]
///
///   return startSketchOn(XY)
///   |> startProfile(at = p0)
///   |> line(endAbsolute = p1)
///   |> line(endAbsolute = p2)
///   |> line(endAbsolute = p3)
///   |> line(endAbsolute = p0)
///   |> close()
///   |> extrude(length = length)
/// }
///
/// width = 20
/// fn transform(@i) {
///   return {
///     // Move down each time.
///     translate = [0, 0, -i * width],
///     // Make the cube longer, wider and flatter each time.
///     scale = [pow(1.1, exp = i), pow(1.1, exp = i), pow(0.9, exp = i)],
///     // Turn by 15 degrees each time.
///     rotation = {
///       angle = 15 * i,
///       origin = "local",
///     }
///   }
/// }
///
/// myCubes =
///   cube(length = width, center = [100,0])
///   |> patternTransform(instances = 25, transform = transform)
/// ```
///
/// ```kcl
/// fn cube(length, center) {
///   l = length/2
///   x = center[0]
///   y = center[1]
///   p0 = [-l + x, -l + y]
///   p1 = [-l + x,  l + y]
///   p2 = [ l + x,  l + y]
///   p3 = [ l + x, -l + y]
///   
///   return startSketchOn(XY)
///   |> startProfile(at = p0)
///   |> line(endAbsolute = p1)
///   |> line(endAbsolute = p2)
///   |> line(endAbsolute = p3)
///   |> line(endAbsolute = p0)
///   |> close()
///   |> extrude(length = length)
/// }
///
/// width = 20
/// fn transform(@i) {
///   return {
///     translate = [0, 0, -i * width],
///     rotation = {
///       angle = 90 * i,
///       // Rotate around the overall scene's origin.
///       origin = "global",
///     }
///   }
/// }
/// myCubes =
///   cube(length = width, center = [100,100])
///   |> patternTransform(instances = 4, transform = transform)
/// ```
///
/// ```kcl
/// // Parameters
/// r = 50    // base radius
/// h = 10    // layer height
/// t = 0.005 // taper factor [0-1)
/// // Defines how to modify each layer of the vase.
/// // Each replica is shifted up the Z axis, and has a smoothly-varying radius
/// fn transform(@replicaId) {
///   scale = r * abs(1 - (t * replicaId)) * (5 + cos((replicaId / 8): number(rad)))
///   return {
///     translate = [0, 0, replicaId * 10],
///     scale = [scale, scale, 0],
///   }
/// }
/// // Each layer is just a pretty thin cylinder.
/// fn layer() {
///   return startSketchOn(XY) // or some other plane idk
///     |> circle(center = [0, 0], radius = 1, tag = $tag1)
///     |> extrude(length = h)
/// }
/// // The vase is 100 layers tall.
/// // The 100 layers are replica of each other, with a slight transformation applied to each.
/// vase = layer() |> patternTransform(instances = 100, transform = transform)
/// ```
///
/// ```kcl
/// fn transform(@i) {
///   // Transform functions can return multiple transforms. They'll be applied in order.
///   return [
///     { translate = [30 * i, 0, 0] },
///     { rotation = { angle = 45 * i } },
///   ]
/// }
/// startSketchOn(XY)
///   |> startProfile(at = [0, 0])
///   |> polygon(
///        radius = 10,
///        numSides = 4,
///        center = [0, 0],
///        inscribed = false,
///      )
///   |> extrude(length = 4)
///   |> patternTransform(instances = 3, transform = transform)
/// ```
@(impl = std_rust)
export fn patternTransform(
  /// The solid(s) to duplicate.
  @solids: [Solid; 1+],
  /// The number of total instances. Must be greater than or equal to 1. This includes the original entity. For example, if instances is 2, there will be two copies -- the original, and one new copy. If instances is 1, this has no effect.
  instances: number(Count),
  /// How each replica should be transformed. The transform function takes a single parameter: an integer representing which number replication the transform is for. E.g. the first replica to be transformed will be passed the argument `1`. This simplifies your math: the transform function can rely on id `0` being the original instance passed into the `patternTransform`. See the examples.
  transform: fn(number(Count)): {},
  /// If the target was sketched on an extrusion, setting this will use the original sketch as the target, not the entire joined solid.
  useOriginal?: boolean = false,
): [Solid; 1+] {}