#include "abacus.hpp"

abacus::abacus() {
    auto parse_function = [](const char* s) {
        return (void*) new number(s);
    };
    auto free_function = [](void* num) {
        delete ((number*) num);
    };
    libab_init(&ab, parse_function, free_function);
    libab_register_basetype(&ab, "str", &basetype_string);
    libab_create_table(&ab, scope, &ab.table);
}

void abacus::add_variable(const std::string& name, ref val) {
    libab_table_entry* entry = libab_table_search_entry_value(get<libab_table>(scope), name.c_str());
    if(entry) {
        libab_ref_free(&entry->data_u.value);
        libab_ref_copy(val, &entry->data_u.value);
    } else {
        libab_put_table_value(get<libab_table>(scope), name.c_str(), std::move(val));
    }
}

void abacus::add_function(const std::string& name, libab_function_ptr ptr, const std::string& type) {
    if(compiled_types.find(type) != compiled_types.end()) {
        libab_register_function(&ab, name.c_str(), compiled_types[type], ptr);
    } else {
        ref& new_ref = compiled_types[type];
        libab_create_type(&ab, new_ref, type.c_str());
        libab_register_function(&ab, name.c_str(), new_ref, ptr);
    }
}

void abacus::add_operator_infix(const std::string& op, const std::string& func, int assoc, int prec) {
    libab_register_operator_infix(&ab, op.c_str(), prec, assoc, func.c_str());
}
void abacus::add_operator_prefix(const std::string& op, const std::string& func) {
    libab_register_operator_prefix(&ab, op.c_str(), func.c_str());
}
void abacus::add_operator_postfix(const std::string& op, const std::string& func) {
    libab_register_operator_postfix(&ab, op.c_str(), func.c_str());
}

ref abacus::run(const std::string& code) {
    ref value;
    libab_run_scoped(&ab, code.c_str(), scope, value);
    libab_gc_run(&ab.containers);
    return value;
}

std::string abacus::to_string(ref& val) {
    ref string_value = call("to_string", val);
    if(string_value == nullptr) return "Unable to convert to string.";
    libab_basetype* base = get<libab_parsetype>(&get<libab_value>(string_value)->type)->data_u.base;
    if(base != &basetype_string) return "\"to_string\" did not return string.";
    return get<string>(&get<libab_value>(string_value)->data)->value;
}

abacus::~abacus() {
    scope = nullptr;
    libab_free(&ab);
}