#include "diagram/scope.h"
#include "debugtools.h"

using namespace samb;

/* Scope::iterator */

Scope::iterator::iterator(Statement::pointer statement) :
    _current(statement)
{
    if (_current == nullptr) {
        debug_err("invalid iterator interating nullptr");
    }

}

Scope::iterator::~iterator()
{

}

bool Scope::iterator::operator==(const iterator &other) const
{
    return *_current == *other;
}

bool Scope::iterator::operator!=(const iterator &other) const
{
    return !(*_current == *other);
}

Scope::iterator& Scope::iterator::operator++()
{
    if (_current->next() != nullptr) {
        _current = _current->next();
    } else {
        // throw std::logic_error("Statement::iterator::operator++() m_current->next() is nullptr");
    }

    return *this;
}

Scope::iterator& Scope::iterator::operator++(int)
{
    static Scope::iterator old(*this);

    old = *this;
    operator++();
    return old;
}

Statement& Scope::iterator::operator*() const
{
    if (_current == nullptr)
        throw std::logic_error("Scope::iterator::operator*() m_current is nullptr");

    return *_current;
}

Statement::pointer Scope::iterator::operator->() const
{
    return _current;
}


/* Scope */

Scope::Scope(const QString &label) :
    Statement(Statement::Type::SCOPE, label, nullptr),
    _head(nullptr), _tail(nullptr)
{
    _head = _tail = new Statement(Statement::PROCESS, "");
}

Scope::Scope(const QString &label, Statement::pointer first) :
    Statement(Statement::Type::SCOPE, label, first),
    _head(first), _tail(first)
{

}

Scope::~Scope() {

}

Scope::iterator Scope::insert_after(Scope::iterator it, Statement::pointer statement)
{
    if (statement == nullptr)
        throw std::invalid_argument("Statement::insert_after() cannot insert nullptr");

    statement->next(it->next());
    it->next(statement);

    _size++;

    return it;
}

Scope::iterator Scope::erase_after(Scope::iterator it)
{
    if (it->next() == nullptr)
        return end();

    it->next(it->next()->next());

    return it;
}

Scope::iterator Scope::begin()
{
    return iterator(_head);
}

const Scope::iterator Scope::begin() const
{
    return begin();
}

Scope::iterator Scope::end()
{
    return iterator(_tail);
}

const Scope::iterator Scope::end() const
{
    return end();
}