use gc_arena::Collect;
use num_enum::TryFromPrimitive;

macro_rules! define_builtins {
    ($(($name:literal, $variant:ident, $arity:expr)),* $(,)?) => {
        /// Builtin function registry.
        /// Array index IS the PrimOp id. (name, arity) pairs.
        pub const BUILTINS: &[(&str, u8)] = &[
            $(($name, $arity),)*
        ];

        #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, TryFromPrimitive, Collect)]
        #[repr(u8)]
        #[collect(require_static)]
        pub enum BuiltinId {
            $($variant,)*
        }
    };
}

define_builtins! {
    ("abort",                    Abort,                    1),
    ("__add",                      Add,                      2),
    ("__addErrorContext",          AddErrorContext,           2),
    ("__all",                      All,                      2),
    ("__any",                      Any,                      2),
    ("__appendContext",            AppendContext,             2),
    ("__attrNames",                AttrNames,                1),
    ("__attrValues",               AttrValues,               1),
    ("baseNameOf",               BaseNameOf,               1),
    ("__bitAnd",                   BitAnd,                   2),
    ("__bitOr",                    BitOr,                    2),
    ("__bitXor",                   BitXor,                   2),
    ("break",                    Break,                    1),
    ("__catAttrs",                 CatAttrs,                 2),
    ("__ceil",                     Ceil,                     1),
    ("__compareVersions",          CompareVersions,          2),
    ("__concatLists",              ConcatLists,              1),
    ("__concatMap",                ConcatMap,                2),
    ("__concatStringsSep",         ConcatStringsSep,         2),
    ("__convertHash",              ConvertHash,              1),
    ("__deepSeq",                  DeepSeq,                  2),
    ("derivation",               Derivation,               1),
    ("derivationStrict",         DerivationStrict,         1),
    ("dirOf",                    DirOf,                    1),
    ("__div",                      Div,                      2),
    ("__elem",                     Elem,                     2),
    ("__elemAt",                   ElemAt,                   2),
    ("fetchGit",                 FetchGit,                 1),
    ("fetchMercurial",           FetchMercurial,           1),
    ("fetchTarball",             FetchTarball,             1),
    ("fetchTree",                FetchTree,                1),
    ("__fetchurl",                 FetchUrl,                 1),
    ("__filter",                   Filter,                   2),
    ("__filterSource",             FilterSource,             2),
    ("__findFile",                 FindFile,                 2),
    ("__floor",                    Floor,                    1),
    ("__foldl'",                   FoldlStrict,              3),
    ("__fromJSON",                 FromJSON,                 1),
    ("fromTOML",                 FromTOML,                 1),
    ("__functionArgs",             FunctionArgs,             1),
    ("__genList",                  GenList,                  2),
    ("__genericClosure",           GenericClosure,           1),
    ("__getAttr",                  GetAttr,                  2),
    ("__getContext",               GetContext,               1),
    ("__getEnv",                   GetEnv,                   1),
    ("__groupBy",                  GroupBy,                  2),
    ("__hasAttr",                  HasAttr,                  2),
    ("__hasContext",               HasContext,               1),
    ("__hashFile",                 HashFile,                 2),
    ("__hashString",               HashString,               2),
    ("__head",                     Head,                     1),
    ("import",                   Import,                   1),
    ("__intersectAttrs",           IntersectAttrs,           2),
    ("__isAttrs",                  IsAttrs,                  1),
    ("__isBool",                   IsBool,                   1),
    ("__isFloat",                  IsFloat,                  1),
    ("__isFunction",               IsFunction,               1),
    ("__isInt",                    IsInt,                    1),
    ("__isList",                   IsList,                   1),
    ("isNull",                   IsNull,                   1),
    ("__isPath",                   IsPath,                   1),
    ("__isString",                 IsString,                 1),
    ("__length",                   Length,                   1),
    ("__lessThan",                 LessThan,                 2),
    ("__listToAttrs",              ListToAttrs,              1),
    ("map",                      Map,                      2),
    ("__mapAttrs",                 MapAttrs,                 2),
    ("__match",                    Match,                    2),
    ("__mul",                      Mul,                      2),
    ("null",                     Null,                     0), // constant, not a function
    ("__parseDrvName",             ParseDrvName,             1),
    ("__partition",                Partition,                2),
    ("__path",                     Path,                     1),
    ("__pathExists",               PathExists,               1),
    ("placeholder",              Placeholder,              1),
    ("__readDir",                  ReadDir,                  1),
    ("__readFile",                 ReadFile,                 1),
    ("__readFileType",             ReadFileType,             1),
    ("removeAttrs",              RemoveAttrs,              2),
    ("__replaceStrings",           ReplaceStrings,           3),
    ("scopedImport",             ScopedImport,             2),
    ("__seq",                      Seq,                      2),
    ("__sort",                     Sort,                     2),
    ("__split",                    Split,                    2),
    ("__splitVersion",             SplitVersion,             1),
    ("__storePath",                StorePath,                1),
    ("__stringLength",             StringLength,             1),
    ("__sub",                      Sub,                      2),
    ("__substring",                Substring,                3),
    ("__tail",                     Tail,                     1),
    ("throw",                    Throw,                    1),
    ("__toFile",                   ToFile,                   2),
    ("__toJSON",                   ToJSON,                   1),
    ("__toPath",                   ToPath,                   1),
    ("toString",                 ToString,                 1),
    ("__toXML",                    ToXML,                    1),
    ("__trace",                    Trace,                    2),
    ("__tryEval",                  TryEval,                  1),
    ("__typeOf",                   TypeOf,                   1),
    ("__unsafeDiscardStringContext", UnsafeDiscardStringContext, 1),
    ("__unsafeGetAttrPos",         UnsafeGetAttrPos,         2),
    ("__warn",                     Warn,                     2),
    ("__zipAttrsWith",             ZipAttrsWith,             2),
}