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/**
 * Unit tests for checking the calc comp code in nfagraph/ng_calc_components.cpp
 */

#include "config.h"
#include "gtest/gtest.h"
#include "nfagraph_common.h"
#include "nfagraph/ng.h"
#include "nfagraph/ng_calc_components.h"

using namespace std;
using namespace ue2;

TEST(NFAGraph, CalcComp1) {
    auto graph = constructGraph("abc|def|ghi", 0);
    ASSERT_TRUE(graph != nullptr);

    Grey grey;
    grey.calcComponents = true;
    auto comps = calcComponents(std::move(graph), grey);
    ASSERT_EQ(3, comps.size());
}

TEST(NFAGraph, CalcComp2) {
    auto graph = constructGraph("a|b|c|d|e|f|g|h|i", 0);
    ASSERT_TRUE(graph != nullptr);

    Grey grey;
    grey.calcComponents = true;
    auto comps = calcComponents(std::move(graph), grey);

    // We should be identifying this as a trivial case and not splitting it.
    ASSERT_EQ(1, comps.size());
}

TEST(NFAGraph, RecalcComp1) {
    deque<unique_ptr<NGHolder>> comps;
    comps.push_back(constructGraph("abc|def|ghi", 0));
    ASSERT_TRUE(comps.back() != nullptr);

    Grey grey;
    grey.calcComponents = true;
    recalcComponents(comps, grey);

    ASSERT_EQ(3, comps.size());
}