//! Write operations — the typed, transport-agnostic vocabulary for changing the
//! document (plan §5). The `Operation` enum itself is GENERATED into
//! `crate::gen` by `build.rs` from `spec/entities.toml`; this module re-exports
//! it and holds the hand-written payload mirrors.

use serde::{Deserialize, Serialize};

pub use crate::gen::Operation;

/// Boolean operation kind for [`Operation::SolidBoolean`].
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum BoolOp {
    Union,
    Intersection,
    Difference,
}

/// Construction spec for a B-rep solid primitive (plain-data mirror of the
/// non-serde `cadkernel::brep::make::*` arguments).
#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
pub enum SolidPrimitive {
    Cuboid { origin: [f64; 3], size: [f64; 3] },
    Sphere { centre: [f64; 3], radius: f64 },
    Cylinder { base: [f64; 3], radius: f64, height: f64 },
    Cone { base: [f64; 3], radius: f64, height: f64 },
    Torus { centre: [f64; 3], major_radius: f64, minor_radius: f64 },
    Wedge { origin: [f64; 3], size: [f64; 3] },
}

/// Construction spec for a minimal 2D curve entity (phase-1 set; profiles/inputs).
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum Curve2Spec {
    Line { start: [f64; 3], end: [f64; 3] },
    Circle { centre: [f64; 3], radius: f64 },
    Polyline { points: Vec<[f64; 3]>, closed: bool },
    Point { position: [f64; 3] },
    /// Circular arc, counter-clockwise from `start_angle` to `end_angle` (radians).
    Arc { centre: [f64; 3], radius: f64, start_angle: f64, end_angle: f64 },
    /// Ellipse: `major_axis` is the major-axis endpoint relative to `centre`;
    /// `ratio` = minor/major. `start`/`end` parameters 0..2π (full ellipse = 0..2π).
    Ellipse { centre: [f64; 3], major_axis: [f64; 3], ratio: f64, start: f64, end: f64 },
    /// NURBS spline (control points + knots + weights; `degree` typically 3).
    Spline { degree: i32, control_points: Vec<[f64; 3]>, knots: Vec<f64>, weights: Vec<f64> },
    /// A ray from `origin` along `direction` (bounded at origin only).
    Ray { origin: [f64; 3], direction: [f64; 3] },
    /// An infinite construction line through `origin` along `direction`.
    XLine { origin: [f64; 3], direction: [f64; 3] },
}

/// A generic entity-construction payload used by the bulk op
/// [`crate::ops::Operation::CreateMany`]. Mirrors the per-family construction
/// specs so one bulk op can carry many homogeneous (or mixed) creations.
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum EntitySpec {
    Curve(Curve2Spec),
    Solid(SolidPrimitive),
}

/// Construction spec for a block reference (`INSERT`): place the block
/// `block_name` (must exist as a BlockRecord) at `insert_point` with uniform
/// `scale` and `rotation` (radians, about Z).
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct InsertSpec {
    pub block_name: String,
    pub insert_point: [f64; 3],
    pub scale: f64,
    pub rotation: f64,
}

/// Construction spec for a paper-space `VIEWPORT`: a `width`×`height` viewport
/// centered at `center` (paper space), looking at `view_target` (model space,
/// WCS) with `view_height` (model-space height visible; the viewport's zoom).
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct ViewportSpec {
    pub center: [f64; 3],
    pub width: f64,
    pub height: f64,
    pub view_target: [f64; 3],
    pub view_height: f64,
}

/// Construction spec for a single-line `TEXT` annotation.
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct TextSpec {
    pub value: String,
    pub insertion_point: [f64; 3],
    pub height: f64,
    pub rotation: f64,
}

/// Construction spec for a multi-line `MTEXT` annotation.
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct MTextSpec {
    pub value: String,
    pub insertion_point: [f64; 3],
    pub height: f64,
}

/// A rigid similarity (rotation + translation + optional uniform scale/reflection)
/// as a plain-data mirror of `cadkernel::brep::transform`'s `Placement`
/// (non-serde). Columns are the new basis axes; `origin` is the translation.
#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
pub struct PlacementSpec {
    pub x_axis: [f64; 3],
    pub y_axis: [f64; 3],
    pub z_axis: [f64; 3],
    pub origin: [f64; 3],
}

impl PlacementSpec {
    /// Identity placement (no transform).
    pub const IDENTITY: PlacementSpec = PlacementSpec {
        x_axis: [1.0, 0.0, 0.0],
        y_axis: [0.0, 1.0, 0.0],
        z_axis: [0.0, 0.0, 1.0],
        origin: [0.0, 0.0, 0.0],
    };

    /// Pure translation to `origin` (axes unchanged).
    pub fn at(origin: [f64; 3]) -> Self {
        Self { origin, ..Self::IDENTITY }
    }
}

/// The item-count cap for a single bulk op envelope (plan §5.3): bounds
/// host-side execution time and payload. Over-cap → `ApiError::Validation`.
pub const BULK_ITEM_CAP: usize = 100_000;

/// Convenience accessors used by the facade/executor.
impl crate::gen::Operation {
    /// The op name used in `ApiError::Validation { op, .. }`.
    pub fn op_name(&self) -> &'static str {
        use crate::gen::Operation::*;
        match self {
            CreateSolid(_) => "CreateSolid",
            CreateCurve(_) => "CreateCurve",
            Extrude { .. } => "Extrude",
            Revolve { .. } => "Revolve",
            Transform { .. } => "Transform",
            SolidBoolean { .. } => "SolidBoolean",
            AddVertex { .. } => "AddVertex",
            Delete { .. } => "Delete",
            CreateMany(_) => "CreateMany",
            TransformMany { .. } => "TransformMany",
            DeleteMany(_) => "DeleteMany",
            CreateInsert(_) => "CreateInsert",
            CreateViewport(_) => "CreateViewport",
            CreateText(_) => "CreateText",
            CreateMText(_) => "CreateMText",
            SetTextContent { .. } => "SetTextContent",
        }
    }
}