ComponentTest.h

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/* Copyright (C) 2017 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "lib/self_test.h"

#include "maths/Matrix3D.h"
#include "maths/Vector3D.h"
#include "ps/XML/Xeromyces.h"
#include "simulation2/MessageTypes.h"
#include "simulation2/system/Component.h"
#include "simulation2/components/ICmpTerrain.h"
#include "simulation2/serialization/DebugSerializer.h"
#include "simulation2/serialization/HashSerializer.h"
#include "simulation2/serialization/StdSerializer.h"
#include "simulation2/serialization/StdDeserializer.h"

#include <iostream>

/**
 * @file
 * Various common features for component test cases.
 */

/**
 * Class to test a single component.
 * - Create an instance of this class
 * - Use AddMock to add mock components that the tested component relies on
 * - Use Add to add the test component itself, and it returns a component pointer
 * - Call methods on the component pointer
 * - Use Roundtrip to test the consistency of serialization
 */
class ComponentTestHelper
{
    CSimContext m_Context;
    CComponentManager m_ComponentManager;
    CParamNode m_Param;
    IComponent* m_Cmp;
    EComponentTypeId m_Cid;

public:
    ComponentTestHelper(shared_ptr<ScriptRuntime> runtime) :
        m_Context(), m_ComponentManager(m_Context, runtime), m_Cmp(NULL)
    {
        m_ComponentManager.LoadComponentTypes();
    }

    ScriptInterface& GetScriptInterface()
    {
        return m_ComponentManager.GetScriptInterface();
    }

    CSimContext& GetSimContext()
    {
        return m_Context;
    }

    /**
     * Call this once to initialise the test helper with a component.
     */
    template<typename T>
    T* Add(EComponentTypeId cid, const std::string& xml, entity_id_t ent = 10)
    {
        TS_ASSERT(m_Cmp == NULL);

        CEntityHandle handle;
        if (ent == SYSTEM_ENTITY)
        {
            m_ComponentManager.InitSystemEntity();
            handle = m_ComponentManager.GetSystemEntity();
            m_Context.SetSystemEntity(handle);
        }
        else
            handle = m_ComponentManager.LookupEntityHandle(ent, true);

        m_Cid = cid;
        TS_ASSERT_EQUALS(CParamNode::LoadXMLString(m_Param, ("<test>" + xml + "</test>").c_str()), PSRETURN_OK);
        TS_ASSERT(m_ComponentManager.AddComponent(handle, m_Cid, m_Param.GetChild("test")));
        m_Cmp = m_ComponentManager.QueryInterface(ent, T::GetInterfaceId());
        TS_ASSERT(m_Cmp != NULL);
        return static_cast<T*> (m_Cmp);
    }

    void AddMock(entity_id_t ent, EInterfaceId iid, IComponent& component)
    {
        CEntityHandle handle;
        if (ent == SYSTEM_ENTITY)
        {
            m_ComponentManager.InitSystemEntity();
            handle = m_ComponentManager.GetSystemEntity();
            m_Context.SetSystemEntity(handle);
        }
        else
            handle = m_ComponentManager.LookupEntityHandle(ent, true);

        m_ComponentManager.AddMockComponent(handle, iid, component);
    }

    void HandleMessage(IComponent* cmp, const CMessage& msg, bool global)
    {
        cmp->HandleMessage(msg, global);
    }

    /**
     * Checks that the object roundtrips through its serialize/deserialize functions correctly.
     * Computes the debug output, hash, and binary serialization; then deserializes into a new
     * system and checks the serialization outputs are unchanged.
     */
    void Roundtrip(bool verbose = false)
    {
        std::stringstream dbgstr1;
        CDebugSerializer dbg1(GetScriptInterface(), dbgstr1);
        m_Cmp->Serialize(dbg1);

        if (verbose)
            std::cout << "--------\n" << dbgstr1.str() << "--------\n";

        CHashSerializer hash1(GetScriptInterface());
        m_Cmp->Serialize(hash1);

        std::stringstream stdstr1;
        CStdSerializer std1(GetScriptInterface(), stdstr1);
        m_Cmp->Serialize(std1);

        ComponentTestHelper test2(GetScriptInterface().GetRuntime());
        // (We should never need to add any mock objects etc to test2, since deserialization
        // mustn't depend on other components already existing)

        CEntityHandle ent = test2.m_ComponentManager.LookupEntityHandle(10, true);

        CStdDeserializer stdde2(test2.GetScriptInterface(), stdstr1);

        IComponent* cmp2 = test2.m_ComponentManager.ConstructComponent(ent, m_Cid);
        cmp2->Deserialize(m_Param.GetChild("test"), stdde2);

        TS_ASSERT(stdstr1.peek() == EOF); // Deserialize must read whole stream

        std::stringstream dbgstr2;
        CDebugSerializer dbg2(test2.GetScriptInterface(), dbgstr2);
        cmp2->Serialize(dbg2);

        if (verbose)
            std::cout << "--------\n" << dbgstr2.str() << "--------\n";

        CHashSerializer hash2(test2.GetScriptInterface());
        cmp2->Serialize(hash2);

        std::stringstream stdstr2;
        CStdSerializer std2(test2.GetScriptInterface(), stdstr2);
        cmp2->Serialize(std2);

        TS_ASSERT_EQUALS(dbgstr1.str(), dbgstr2.str());

        TS_ASSERT_EQUALS(hash1.GetHashLength(), hash2.GetHashLength());
        TS_ASSERT_SAME_DATA(hash1.ComputeHash(), hash2.ComputeHash(), hash1.GetHashLength());

        TS_ASSERT_EQUALS(stdstr1.str(), stdstr2.str());

        // TODO: need to extend this so callers can run methods on the cloned component
        // to check that all its data is still correct
    }
};

/**
 * Simple terrain implementation with constant height of 50.
 */
class MockTerrain : public ICmpTerrain
{
public:
    DEFAULT_MOCK_COMPONENT()

    virtual bool IsLoaded() const
    {
        return true;
    }

    virtual CFixedVector3D CalcNormal(entity_pos_t UNUSED(x), entity_pos_t UNUSED(z)) const
    {
        return CFixedVector3D(fixed::FromInt(0), fixed::FromInt(1), fixed::FromInt(0));
    }

    virtual CVector3D CalcExactNormal(float UNUSED(x), float UNUSED(z)) const
    {
        return CVector3D(0.f, 1.f, 0.f);
    }

    virtual entity_pos_t GetGroundLevel(entity_pos_t UNUSED(x), entity_pos_t UNUSED(z)) const
    {
        return entity_pos_t::FromInt(50);
    }

    virtual float GetExactGroundLevel(float UNUSED(x), float UNUSED(z)) const
    {
        return 50.f;
    }

    virtual u16 GetTilesPerSide() const
    {
        return 16;
    }

    virtual u16 GetVerticesPerSide() const
    {
        return 17;
    }

    virtual CTerrain* GetCTerrain()
    {
        return NULL;
    }

    virtual void MakeDirty(i32 UNUSED(i0), i32 UNUSED(j0), i32 UNUSED(i1), i32 UNUSED(j1))
    {
    }

    virtual void ReloadTerrain(bool UNUSED(ReloadWater))
    {
    }
};