use core::fmt;

use num_rational::Ratio;

pub type Fraction = Ratio<i64>;

/// Kind tag for one server-entity wasm struct. Each variant maps to a

/// concrete `$<kind>` GC struct registered in

/// `CompileContext::new_skeleton`, plus a set of typed field accessors

/// in the native registry. Adding an entity adds one variant here +

/// one row in the `nomi_entity!` macro invocation; the compiler and

/// host-side allocators pick up the rest by expansion.

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]

pub enum EntityKind {

    Account,

    Commodity,

    Transaction,

    Split,

    Tag,

    Price,

    SshKey,

    /// Error condition raised by `(error 'code "msg")` and caught by

    /// `(handler-case)`. Maps to the `$nomi_condition` struct registered

    /// for exception support; the clause variable `e` binds at this kind so

    /// `(error-code e)` / `(error-message e)` type-check.

    Condition,

}

impl EntityKind {

    /// Name of the wasm struct type the compiler registers in

    /// `CompileContext::new_skeleton` for this entity kind. Keep in

    /// lockstep with the `register_struct_type` calls there.

    #[must_use]

        }

}

impl fmt::Display for EntityKind {

}

/// Element type of a homogeneous `$pair` chain. Tracked at compile time so

/// CAR/CDR emit the right downcast and CONS refuses heterogeneous mixing

/// with a structured type error. Kept as a `Copy` enum so `WasmType` stays

/// `Copy` — and so adding a new element type stays a one-line variant

/// addition. Nesting (pairs-of-pairs) waits for a follow-up sub-slice

/// once flat lists are stable across the consumers.

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]

pub enum PairElement {

    I32,

    /// Truth-value cell: shares `I32`'s i31-boxed car representation (CAR/CDR

    /// emit the same i31 downcast), but distinct so a bool extracted from a

    /// list serializes as `Nil` / `Bool`, not `Number` — the list-element

    /// analogue of [`WasmType::Bool`] vs `I32`.

    Bool,

    Ratio,

    Commodity,

    StringRef,

    Entity(EntityKind),

    /// Heterogeneous escape hatch (ADR-0025). Cars stay as raw

    /// `anyref`; CAR returns `WasmType::AnyRef` and the script must

    /// downcast at the use site (or consume via type-test natives like

    /// `ok?` / `err-code`). CONS widens to this variant when the two

    /// arms disagree on element type, and host fns that produce

    /// fundamentally heterogeneous lists (e.g. =catch-each= result

    /// cells) construct directly into `PairRef(AnyRef)`.

    AnyRef,

}

impl fmt::Display for PairElement {

        }

}

impl PairElement {

    /// The matching `WasmType` for a pair's car when extracted.

    #[must_use]

        }

    /// Inverse of `as_wasm_type`: returns `None` if the given type can't

    /// ride a `$pair`'s anyref car. `WasmType::AnyRef` round-trips to

    /// `PairElement::AnyRef`; nested pairs and closures still need their

    /// own follow-up lattice extension.

    #[must_use]

            // `Bool` keeps its own slot — it shares `I32`'s i31-boxed car

            // representation (the CAR/CDR downcast is identical) but stays

            // distinct so a bool extracted from a list serializes as Nil/Bool,

            // not Number.

        }

    /// Widen `self` against `other` to the most-specific common

    /// element. Identical types stay; everything else widens to

    /// `AnyRef` so heterogeneous CONS no longer errors. Symmetric.

    #[must_use]

}

/// Identifier for a closure signature interned in the compile

/// context's closure registry. Distinct closures sharing the same

/// `(arg-types) -> ret-type` signature share an id (and therefore a

/// `$closure_<id>` wasm GC type); their env-struct types vary

/// independently per scope. The id is allocated in registration order

/// — small, dense, `Copy` — so it can ride inside `WasmType` without

/// growing the enum.

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]

pub struct ClosureSigId(pub u32);

impl fmt::Display for ClosureSigId {

}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]

pub enum WasmType {

    I32,

    /// Boolean: a comparison / predicate / `and` / `or` result, or a runtime

    /// `#t` / `#f`. Wasm representation is identical to `I32` (0 = false,

    /// nonzero = true), so it composes with `if` / `br_if` and boxes via

    /// `ref.i31` exactly like `I32`. It is a DISTINCT compile-time type only

    /// so the debug serializer can surface it as `Nil` / `Bool` rather than

    /// `Number`: an `I32` is a raw count (tag-count, split-count, …) that

    /// serializes as a number, whereas a `Bool` is a truth value. Refused by

    /// arithmetic like every non-numeric type.

    Bool,

    Ratio,

    StringRef,

    /// Commodity-bearing numeric: rational amount + originating commodity

    /// uuid. Distinct from `Ratio` so the compiler can refuse mixing money

    /// and pure-rational arithmetic at compile time. Wasm representation:

    /// `(i64 numer, i64 denom, i64 commodity_hi, i64 commodity_lo)`.

    Commodity,

    /// Homogeneous list cell: `$pair` WasmGC struct with an `anyref` car

    /// and a nullable `$pair` cdr. The `PairElement` records the car's

    /// type at compile time so CAR/CDR can emit the correct downcast and

    /// CONS refuses heterogeneous mixing. Retires the i32-only `$cons` —

    /// every runtime list shape in the compiler routes through this type.

    PairRef(PairElement),

    /// Raw `anyref` car payload extracted from a `PairRef(AnyRef)` or

    /// produced by a host fn that returns a heterogeneous value

    /// (ADR-0025). Refused by arithmetic / numeric comparison / closure

    /// call / typed pair construction; the script must downcast via

    /// type-test natives (e.g. `ok?`, `err-code`) before consuming.

    AnyRef,

    /// Typed server-entity reference: a `(ref null $<kind>)` GC struct

    /// whose field layout matches the `nomi_entity!` declaration for the

    /// kind. Refused by arithmetic / list-CONS / numeric comparison; the

    /// only legal operations are the entity-specific accessor natives

    /// (`account-id`, `commodity-name`, etc.) registered alongside the

    /// struct type.

    EntityRef(EntityKind),

    /// First-class closure value: `(ref null $closure_<sig>)` carrying a

    /// typed funcref + nullable env ref. The `ClosureSigId` indexes the

    /// per-context registry that owns the wasm types and per-call-site

    /// env-struct layouts. Eligible for FUNCALL / APPLY via `call_ref`;

    /// refused by arithmetic / numeric comparison / pair construction.

    Closure(ClosureSigId),

}

impl fmt::Display for WasmType {

        }

}

#[derive(Debug, Clone, PartialEq)]

pub struct LambdaParams {

    pub required: Vec<String>,

    pub optional: Vec<(String, Option<Expr>)>,

    pub rest: Option<String>,

    pub key: Vec<(String, Option<Expr>)>,

    pub aux: Vec<(String, Option<Expr>)>,

}

impl LambdaParams {

}

#[derive(Debug, Clone, PartialEq)]

pub enum Expr {

    Nil,

    Bool(bool),

    Number(Fraction),

    String(String),

    Symbol(String),

    Keyword(String),

    Bytes(Vec<u8>),

    Cons(Box<Expr>, Box<Expr>),

    List(Vec<Expr>),

    Quote(Box<Expr>),

    Quasiquote(Box<Expr>),

    Unquote(Box<Expr>),

    UnquoteSplicing(Box<Expr>),

    Lambda(LambdaParams, Box<Expr>),

    RuntimeValue(crate::runtime::Value),

    WasmRuntime(WasmType),

    /// Value stored in WASM local variable (index, type)

    WasmLocal(u32, WasmType),

}

impl Expr {

    #[must_use]

    /// Returns the `WasmType` if this expression is a runtime value (`WasmRuntime` or `WasmLocal`).

    #[must_use]

        }

    /// True if this is a runtime value (`WasmRuntime` or `WasmLocal`).

    #[must_use]

}

#[derive(Debug, Clone, PartialEq)]

pub struct Annotation {

    pub name: String,

    pub value: Expr,

}

impl Expr {

    #[must_use]

    #[must_use]

        }

    #[must_use]

        }

    /// Splits a `Symbol` into `(namespace, name)`. A qualified symbol is

    /// stored canonically as `NS:NAME` (ADR-0029); an unqualified one has no

    /// `:` and yields `(None, name)`. Non-symbols yield `None`. The split is

    /// on the single canonical `:` — `NS::NAME` was already folded to `NS:NAME`

    /// by the reader, so at most one `:` is ever present here.

    #[must_use]

        })

}

/// Builds the canonical symbol-table key for a (possibly namespaced) name.

/// `NS:NAME` when a namespace is present, bare `NAME` otherwise — the single

/// source of truth for how a qualified name maps to its flat table key.

#[must_use]

    }

#[derive(Debug, Clone, Default)]

pub struct Program {

    pub exprs: Vec<Expr>,

    pub annotations: Vec<Annotation>,

}

impl Program {

    #[must_use]

    #[must_use]

}

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

    #[test]

    #[test]

}