//------------------------------------------------------------------------------
/*
    This file is part of clio: https://github.com/XRPLF/clio
    Copyright (c) 2025, the clio developers.

    Permission to use, copy, modify, and distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#include "cluster/ClioNode.hpp"
#include "util/MockWriterState.hpp"
#include "util/NameGenerator.hpp"
#include "util/TimeUtils.hpp"

#include <boost/json/object.hpp>
#include <boost/json/value.hpp>
#include <boost/json/value_from.hpp>
#include <boost/json/value_to.hpp>
#include <boost/uuid/random_generator.hpp>
#include <boost/uuid/uuid.hpp>
#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include <chrono>
#include <cstdint>
#include <ctime>
#include <memory>
#include <stdexcept>
#include <string>

using namespace cluster;

struct ClioNodeTest : testing::Test {
    std::string const updateTimeStr = "2015-05-15T12:00:00Z";
    std::chrono::system_clock::time_point const updateTime =
        util::systemTpFromUtcStr(updateTimeStr, ClioNode::kTIME_FORMAT).value();
};

TEST_F(ClioNodeTest, Serialization)
{
    ClioNode const node{
        .uuid = std::make_shared<boost::uuids::uuid>(boost::uuids::random_generator()()),
        .updateTime = updateTime,
        .dbRole = ClioNode::DbRole::Writer
    };

    boost::json::value jsonValue;
    EXPECT_NO_THROW(boost::json::value_from(node, jsonValue));

    ASSERT_TRUE(jsonValue.is_object()) << jsonValue;
    auto const& obj = jsonValue.as_object();

    EXPECT_TRUE(obj.contains("update_time"));
    EXPECT_TRUE(obj.at("update_time").is_string());

    EXPECT_TRUE(obj.contains("db_role"));
    EXPECT_TRUE(obj.at("db_role").is_number());
    EXPECT_EQ(obj.at("db_role").as_int64(), static_cast<int64_t>(node.dbRole));
}

TEST_F(ClioNodeTest, Deserialization)
{
    boost::json::value const jsonValue = {{"update_time", updateTimeStr}, {"db_role", 1}};

    ClioNode node{
        .uuid = std::make_shared<boost::uuids::uuid>(), .updateTime = {}, .dbRole = ClioNode::DbRole::ReadOnly
    };
    ASSERT_NO_THROW(node = boost::json::value_to<ClioNode>(jsonValue));

    EXPECT_NE(node.uuid, nullptr);
    EXPECT_EQ(*node.uuid, boost::uuids::uuid{});
    EXPECT_EQ(node.updateTime, updateTime);
    EXPECT_EQ(node.dbRole, ClioNode::DbRole::LoadingCache);
}

TEST_F(ClioNodeTest, DeserializationInvalidTime)
{
    boost::json::value const jsonValue{"update_time", "invalid_format"};
    EXPECT_THROW(boost::json::value_to<ClioNode>(jsonValue), std::runtime_error);
}

TEST_F(ClioNodeTest, DeserializationMissingTime)
{
    // Prepare a JSON object without update_time
    boost::json::value const jsonValue = {{}};

    // Expect an exception
    EXPECT_THROW(boost::json::value_to<ClioNode>(jsonValue), std::runtime_error);
}

struct ClioNodeDbRoleTestBundle {
    std::string testName;
    ClioNode::DbRole role;
};

struct ClioNodeDbRoleTest : ClioNodeTest, testing::WithParamInterface<ClioNodeDbRoleTestBundle> {};

INSTANTIATE_TEST_SUITE_P(
    AllDbRoles,
    ClioNodeDbRoleTest,
    testing::Values(
        ClioNodeDbRoleTestBundle{.testName = "ReadOnly", .role = ClioNode::DbRole::ReadOnly},
        ClioNodeDbRoleTestBundle{.testName = "LoadingCache", .role = ClioNode::DbRole::LoadingCache},
        ClioNodeDbRoleTestBundle{.testName = "NotWriter", .role = ClioNode::DbRole::NotWriter},
        ClioNodeDbRoleTestBundle{.testName = "Writer", .role = ClioNode::DbRole::Writer},
        ClioNodeDbRoleTestBundle{.testName = "Fallback", .role = ClioNode::DbRole::Fallback}
    ),
    tests::util::kNAME_GENERATOR
);

TEST_P(ClioNodeDbRoleTest, Serialization)
{
    auto const param = GetParam();
    ClioNode const node{
        .uuid = std::make_shared<boost::uuids::uuid>(boost::uuids::random_generator()()),
        .updateTime = updateTime,
        .dbRole = param.role
    };
    auto const jsonValue = boost::json::value_from(node);
    EXPECT_EQ(jsonValue.as_object().at("db_role").as_int64(), static_cast<int64_t>(param.role));
}

TEST_P(ClioNodeDbRoleTest, Deserialization)
{
    auto const param = GetParam();
    boost::json::value const jsonValue = {
        {"update_time", updateTimeStr}, {"db_role", static_cast<int64_t>(param.role)}
    };
    auto const node = boost::json::value_to<ClioNode>(jsonValue);
    EXPECT_EQ(node.dbRole, param.role);
}

TEST_F(ClioNodeDbRoleTest, DeserializationInvalidDbRole)
{
    boost::json::value const jsonValue = {{"update_time", updateTimeStr}, {"db_role", 10}};
    EXPECT_THROW(boost::json::value_to<ClioNode>(jsonValue), std::runtime_error);
}

TEST_F(ClioNodeDbRoleTest, DeserializationMissingDbRole)
{
    boost::json::value const jsonValue = {{"update_time", updateTimeStr}};
    EXPECT_THROW(boost::json::value_to<ClioNode>(jsonValue), std::runtime_error);
}

struct ClioNodeFromTestBundle {
    std::string testName;
    bool readOnly;
    bool fallback;
    bool loadingCache;
    bool writing;
    ClioNode::DbRole expectedRole;
};

struct ClioNodeFromTest : ClioNodeTest, testing::WithParamInterface<ClioNodeFromTestBundle> {
    std::shared_ptr<boost::uuids::uuid> uuid = std::make_shared<boost::uuids::uuid>(boost::uuids::random_generator()());

    MockWriterState writerState;
};

INSTANTIATE_TEST_SUITE_P(
    AllWriterStates,
    ClioNodeFromTest,
    testing::Values(
        ClioNodeFromTestBundle{
            .testName = "ReadOnly",
            .readOnly = true,
            .fallback = false,
            .loadingCache = false,
            .writing = false,
            .expectedRole = ClioNode::DbRole::ReadOnly
        },
        ClioNodeFromTestBundle{
            .testName = "Fallback",
            .readOnly = false,
            .fallback = true,
            .loadingCache = false,
            .writing = false,
            .expectedRole = ClioNode::DbRole::Fallback
        },
        ClioNodeFromTestBundle{
            .testName = "LoadingCache",
            .readOnly = false,
            .fallback = false,
            .loadingCache = true,
            .writing = false,
            .expectedRole = ClioNode::DbRole::LoadingCache
        },
        ClioNodeFromTestBundle{
            .testName = "NotWriterNotReadOnly",
            .readOnly = false,
            .fallback = false,
            .loadingCache = false,
            .writing = false,
            .expectedRole = ClioNode::DbRole::NotWriter
        },
        ClioNodeFromTestBundle{
            .testName = "Writer",
            .readOnly = false,
            .fallback = false,
            .loadingCache = false,
            .writing = true,
            .expectedRole = ClioNode::DbRole::Writer
        }
    ),
    tests::util::kNAME_GENERATOR
);

TEST_P(ClioNodeFromTest, FromWriterState)
{
    auto const& param = GetParam();

    EXPECT_CALL(writerState, isReadOnly()).WillOnce(testing::Return(param.readOnly));
    if (not param.readOnly) {
        EXPECT_CALL(writerState, isFallback()).WillOnce(testing::Return(param.fallback));
        if (not param.fallback) {
            EXPECT_CALL(writerState, isLoadingCache()).WillOnce(testing::Return(param.loadingCache));
            if (not param.loadingCache) {
                EXPECT_CALL(writerState, isWriting()).WillOnce(testing::Return(param.writing));
            }
        }
    }

    auto const beforeTime = std::chrono::system_clock::now();
    auto const node = ClioNode::from(uuid, writerState);
    auto const afterTime = std::chrono::system_clock::now();

    EXPECT_EQ(node.uuid, uuid);
    EXPECT_EQ(node.dbRole, param.expectedRole);
    EXPECT_GE(node.updateTime, beforeTime);
    EXPECT_LE(node.updateTime, afterTime);
}