#include <lcq/pit/runtime/value/func.h>

#include <stdio.h>

bool pit_value_is_func(pit_runtime *rt, pit_value a) {
    return pit_value_is_ref_heavy_sort(rt, a, PIT_VALUE_HEAVY_SORT_FUNC);
}
bool pit_value_is_nativefunc(pit_runtime *rt, pit_value a) {
    return pit_value_is_ref_heavy_sort(rt, a, PIT_VALUE_HEAVY_SORT_NATIVEFUNC);
}
pit_value pit_value_func_lambda(pit_runtime *rt, pit_value args, pit_value freevars, pit_value compiled) {
    // fprintf(stderr, "lambda args: "); pit_dump_to_file(rt, stderr, args, false); fprintf(stderr, "\n");
    // fprintf(stderr, "lambda freevars: "); pit_dump_to_file(rt, stderr, freevars, false); fprintf(stderr, "\n");
    // fprintf(stderr, "lambda compiled: "); pit_dump_to_file(rt, stderr, compiled, false); fprintf(stderr, "\n");
    pit_value ret = pit_value_ref_heavy_new(rt);
    pit_value_heavy *h = pit_value_ref_deref(rt, pit_value_as_ref(rt, ret));
    if (!h) { pit_error(rt, "failed to create new heavy value for lambda"); return PIT_NIL; }
    pit_value env = PIT_NIL;
    while (freevars != PIT_NIL) {
        pit_value sym = pit_value_cons_car(rt, freevars);
        pit_value cell = pit_symtab_get_value_cell(rt, sym);
        env = pit_value_cons(rt, pit_value_cons(rt, sym, cell), env);
        freevars = pit_value_cons_cdr(rt, freevars);
    }
    h->hsort = PIT_VALUE_HEAVY_SORT_FUNC;
    pit_value arg_cells = PIT_NIL;
    pit_value arg_rest_nm = PIT_NIL;
    pit_value separator = pit_symtab_intern_cstr(rt, "&");
    while (args != PIT_NIL) {
        pit_value nm = pit_value_cons_car(rt, args);
        if (pit_value_eq(nm, separator)) {
            pit_value next_nm = pit_value_cons_car(rt, pit_value_cons_cdr(rt, args));
            if (next_nm == PIT_NIL) { pit_error(rt, "invalid & in lambda list"); return PIT_NIL; }
            arg_rest_nm = next_nm;
            arg_cells = pit_value_cons(rt, next_nm, arg_cells);
            break;
        } else {
            arg_cells = pit_value_cons(rt, nm, arg_cells);
            args = pit_value_cons_cdr(rt, args);
        }
    }
    arg_cells = pit_value_list_reverse(rt, arg_cells);
    pit_value closure[4] = {env, arg_cells, arg_rest_nm, compiled};
    h->in.func.nm = PIT_NIL;
    h->in.func.closure = pit_value_array_from_buf(rt, closure, 4);
    return ret;
}
pit_value pit_value_nativefunc_new_with_data(pit_runtime *rt, pit_nativefunc f, void *data) {
    pit_value ret = pit_value_ref_heavy_new(rt);
    pit_value_heavy *h = pit_value_ref_deref(rt, pit_value_as_ref(rt, ret));
    if (!h) { pit_error(rt, "failed to create new heavy value for nativefunc"); return PIT_NIL; }
    h->hsort = PIT_VALUE_HEAVY_SORT_NATIVEFUNC;
    h->in.nativefunc.f = f;
    h->in.nativefunc.data = data;
    return ret;
}
pit_value pit_value_nativefunc_new(pit_runtime *rt, pit_nativefunc f) {
    return pit_value_nativefunc_new_with_data(rt, f, NULL);
}