#include "include/memory.h"
using namespace std;

Memory::Memory(void) {
    scopes.emplace_back();
    scopes.back().depth = 0;
}

bool Memory::contains(string identifier) {
    for (auto rit = scopes.rbegin(); rit != scopes.rend(); ++rit) {
        Scope& scope = *rit;
        if (scope.vars.contains(identifier)) return true;
    }
    
    return false;
}

bool Memory::contains_top(string identifier) {
    Scope& top = scopes.back();
    return top.vars.contains(identifier);
}

void Memory::add_scope(ScopeType type) {
    Scope& top = scopes.back();
    scopes.emplace_back();
    scopes.back().depth = top.depth + 1;
    scopes.back().type = type;
}

void Memory::remove_scope(void) {
    scopes.pop_back();
}

MemoryVar& Memory::get(string identifier) {
    for (auto rit = scopes.rbegin(); rit != scopes.rend(); ++rit) {
        Scope& scope = *rit;
        if (scope.vars.contains(identifier)) return scope.vars[identifier];
    }
    
    throw exception();
}

void Memory::declare(string identifier, Type type) {
    Scope& top = scopes.back();
    top.vars[identifier].type = type;
}

void Memory::update(string identifier, EvalResult value) {
    for (auto rit = scopes.rbegin(); rit != scopes.rend(); ++rit) {
        Scope& scope = *rit;
        if (scope.vars.contains(identifier)) {
            scope.vars[identifier].value = value;
            scope.vars[identifier].initialized = true;
            return;
        }
    }
    
    throw exception();
}

Scope& Memory::_debug_top(void) {
    Scope& top = scopes.back();
    return top;
}