from .. import TypeEnum, Environment, Arg, Builtin, UserFunction, Function, evaluate, InterpretPanic
from ..structs import *

REPL = Environment()

def interpretHowTo(symbol, args, env, ns):
    if not isinstance(args[0], Function):
        raise InterpretPanic(symbol, "expects a :func", args[0])
    print(args[0].describe())
    return List([])

REPL.register("howto", Builtin("howto", interpretHowTo, [Arg("symbol", TypeEnum.ANY)], return_type=Type(":list")))

def interpretSymbols(symbol, args, env, ns):
    keys = [Symbol(k, -1) for k,v in sorted(env.environment.items())]
    return List(keys)

REPL.register("symbols", Builtin("symbols", interpretSymbols, [], return_type=Type(":list")))

def interpretFuncs(symbol, args, env, ns):
    keys = [Symbol(k, -1) for k,v in env.environment.items() if isinstance(v, Builtin)]
    return List(keys)

REPL.register("funcs", Builtin("funcs", interpretFuncs, [], return_type=Type(":list")))

def interpretUserSymbols(symbol, args, env, ns):
    keys = [Symbol(k, -1) for k,v in env.environment.items() if isinstance(v, UserFunction) or isinstance(v, Literal)]
    return List(keys)

REPL.register("user-symbols", Builtin("user-symbols", interpretUserSymbols, [], return_type=Type(":list")))