// DEFAULT TEACHER TEMPLATE (framework default; ADR-0011).
//
// Lives in an engineering file at `exports/teacher.typ`. Compiled AS MAIN with
// the manifest injected:
//   typst compile --root <eng-root> --input manifest=<path-rel-to-root> exports/teacher.typ <out>
//
// Self-contained (copyable into an engineering file). Identical to student.typ
// except the fixed target is "teacher" (so the (kind x target) render matrix in
// cph-render shows solutions and proofs). See student.typ for the full notes on
// why the include loop lives here (package virtual-root resolution) and on the
// OPEN optional-content (`fields`) contract point.

#import "@local/cph-render:0.1.0": render-lesson, part-fields, default-heading-numbering

// This template IS the teacher build, so the target is fixed.
#let target = "teacher"

// Read the injected manifest (a path string relative to typst --root).
#let manifest = toml(sys.inputs.manifest)
#let info = manifest.at("info", default: (:))
#let raw-parts = manifest.at("parts", default: ())

// Assemble each part: include its content fields (computed absolute paths,
// resolved against --root) and read scalar fields from <path>/element.toml.
// `part-fields` (from cph-render) is the single source of truth for kind->fields.
#let parts = raw-parts.map(raw => {
  let kind = raw.at("kind", default: none)
  let path = raw.at("path", default: none)
  let spec = part-fields.at(kind, default: (content: (), optional-content: (), scalars: ()))
  // Which optional content fields are present on disk (manifest-declared).
  let present = raw.at("fields", default: ())
  let part = (kind: kind)

  // Required content fields: <path>/<field>.typ (absolute, root-relative).
  for field in spec.content {
    part.insert(field, include "/" + path + "/" + field + ".typ")
  }
  // Optional content fields: only when the manifest says the file exists.
  for field in spec.optional-content {
    if field in present {
      part.insert(field, include "/" + path + "/" + field + ".typ")
    }
  }
  // Scalar fields come from <path>/element.toml.
  if spec.scalars.len() > 0 {
    let element = toml("/" + path + "/element.toml")
    for field in spec.scalars {
      let v = element.at(field, default: none)
      if v != none and v != "" { part.insert(field, v) }
    }
  }
  part
})

// Presentation: per-level heading numbering. Default (一、 / 1.1 / 1.1.1) comes
// from cph-render; override here per engineering file if desired.
#render-lesson(
  info: info,
  target: target,
  parts: parts,
  heading-numbering: default-heading-numbering,
)
