//! Parametric reconstruction of imported mechanical mesh bodies.

use serde_json::Value;
use solidcraft_doc::FeatureKind;
use solidcraft_doc::expr::Kind;

use super::{
    CommandSpec,
    features::{add_feature, check_expr},
};
use crate::{
    Result, Session,
    params::{bad, expr, str_},
};

pub static COMMANDS: &[CommandSpec] = &[
    CommandSpec::new("mesh.convert", "Convert Mesh", convert)
        .at("MESH", "MODIFY")
        .icon("import")
        .params("body: mesh body name; tolerance?: length expression (default 0.05 mm): reconstruct a closed constant-section mechanical mesh as editable planar and cylindrical faces, with a parametric timeline feature; name?"),
];

fn convert(s: &mut Session, p: &Value) -> Result<Value> {
    let cmd = "mesh.convert";
    let body = str_(p, "body").filter(|b| !b.trim().is_empty()).ok_or_else(|| bad(cmd, "select a mesh body"))?;
    let state = s.model.state();
    let source = state.body(body).ok_or_else(|| bad(cmd, format!("no body `{body}`")))?;
    if !source.body.is_mesh() {
        return Err(bad(cmd, "select a mesh body"));
    }
    if s.doc.model_body_component(source) != s.active_component {
        return Err(bad(cmd, "activate the mesh body's component before converting it"));
    }
    let tolerance = expr(p, "tolerance").unwrap_or_else(|| "0.05 mm".into());
    check_expr(s, &tolerance, Kind::Length, cmd, "tolerance")?;
    add_feature(s, p, FeatureKind::MeshConvert { body: body.into(), tolerance })
}