#include "c_Test.h"
#include "c_Digraph.h"
#include "c_DirectedEulerianCycle.h"
#include "c_VertexIdList.h"

TEST_CASE(test_directed_eulerian_cycle) {
    c_Digraph_t g;
    c_Digraph_Init(&g, 4, NULL);

    /* Construct a simple complete Eulerian directed graph:
     * 0 -> 1 -> 2 -> 0
     * 2 -> 3 -> 2 (nested cycle hook)
     */
    c_Digraph_AddEdge(&g, 0, 1);
    c_Digraph_AddEdge(&g, 1, 2);
    c_Digraph_AddEdge(&g, 2, 0);
    c_Digraph_AddEdge(&g, 2, 3);
    c_Digraph_AddEdge(&g, 3, 2);

    c_DirectedEulerianCycle_t eulerian;
    c_err_t err = c_DirectedEulerianCycle_Init(&eulerian, &g, NULL);
    ASSERT_INT_EQ(C_SUCCESS, err);

    /* Assert an Eulerian path cycle tour is verified */
    ASSERT_TRUE(c_DirectedEulerianCycle_HasCycle(&eulerian));

    c_VertexIdList_t tour_output;
    c_VertexIdList_Init(&tour_output, 0, NULL);

    err = c_DirectedEulerianCycle_GetCycle(&eulerian, &tour_output);
    ASSERT_INT_EQ(C_SUCCESS, err);

    /* Total path sequence elements count must equal exact E + 1 (5 edges + 1 = 6 steps) */
    c_size_t cycle_steps = (c_size_t)c_VertexIdList_GetSize(&tour_output);
    ASSERT_LL_EQ(6, cycle_steps);

    /* First and last step points must align to form a valid complete tour loop boundary */
    c_uint_t start_v = 0;
    c_uint_t end_v = 0;
    c_VertexIdList_Get(&tour_output, 0, &start_v);
    c_VertexIdList_Get(&tour_output, cycle_steps - 1, &end_v);
    ASSERT_LL_EQ(start_v, end_v);

    c_VertexIdList_Destroy(&tour_output);
    c_DirectedEulerianCycle_Destroy(&eulerian);
    c_Digraph_Destroy(&g);
}

int main(int argc, char** argv){

    TEST_START(Component Tests);

    // Execution list configurations
    RUN_TEST(test_directed_eulerian_cycle);

    TEST_REPORT();

    RETURN_TEST_STATUS;
}