#include <stddef.h>
#include <string.h>
#include <stdio.h>

#include "mini-obj-c.h"

#define WARN(f, ...) fprintf(stderr, f "\n", ##__VA_ARGS__)

MethodImplementation method_lookup(struct Class* class, const char* sel)
{
    for (; class; class = class->super) {
        for (size_t i = 0; i < class->methods_count; ++i) {
            auto entry = class->methods[i];
            if (strcmp(entry.sel, sel) == 0) {
                return entry.impl;
            }
        }
    }
    return nullptr;
}

struct Object* msg_send(struct Object* self, const char* sel)
{
    if (!self || !self->class) {
        WARN("Invalid object");
        return nullptr;
    }

    auto impl = method_lookup(self->class, sel);
    if (impl) {
        return impl(self);
    } else {
        WARN("Method '%s' not found for class '%s'", sel, self->class->name);
        return nullptr;
    }
}