//------------------------------------------------------------------------------
/*
    This file is part of clio: https://github.com/XRPLF/clio
    Copyright (c) 2022, 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 "util/StringBuffer.hpp"
#include "util/config/Array.hpp"
#include "util/config/ConfigConstraints.hpp"
#include "util/config/ConfigDefinition.hpp"
#include "util/config/ConfigFileJson.hpp"
#include "util/config/ConfigValue.hpp"
#include "util/config/Types.hpp"
#include "util/log/Logger.hpp"

#include <boost/json/array.hpp>
#include <boost/json/object.hpp>
#include <boost/json/parse.hpp>
#include <fmt/format.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <spdlog/sinks/ostream_sink.h>
#include <spdlog/spdlog.h>

#include <cstddef>
#include <cstdint>
#include <limits>
#include <memory>
#include <ostream>
#include <string>
#include <string_view>
#include <vector>
using namespace util;

using util::config::Array;
using util::config::ConfigFileJson;
using util::config::ConfigType;
using util::config::ConfigValue;

struct LogServiceInitTests : virtual public ::testing::Test {
protected:
    util::config::ClioConfigDefinition config_{
        {"log.channels.[].channel", Array{ConfigValue{ConfigType::String}}},
        {"log.channels.[].level", Array{ConfigValue{ConfigType::String}}},

        {"log.level", ConfigValue{ConfigType::String}.defaultValue("info")},

        {"log.format", ConfigValue{ConfigType::String}.defaultValue(R"(%Y-%m-%d %H:%M:%S.%f %^%3!l:%n%$ - %v)")},
        {"log.is_async", ConfigValue{ConfigType::Boolean}.defaultValue(false)},

        {"log.enable_console", ConfigValue{ConfigType::Boolean}.defaultValue(false)},

        {"log.directory", ConfigValue{ConfigType::String}.optional()},

        {"log.rotation_size",
         ConfigValue{ConfigType::Integer}.defaultValue(2048).withConstraint(config::gValidateUint32)},

        {"log.directory_max_files",
         ConfigValue{ConfigType::Integer}.defaultValue(25).withConstraint(config::gValidateUint32)},

        {"log.tag_style", ConfigValue{ConfigType::String}.defaultValue("none")},
    };

    std::string
    getLoggerString()
    {
        return buffer_.getStrAndReset();
    }

    void
    replaceSinks()
    {
        auto ostreamSink = std::make_shared<spdlog::sinks::ostream_sink_mt>(stream_);

        for (auto const& channel : Logger::kCHANNELS) {
            auto logger = spdlog::get(channel);
            ASSERT_TRUE(logger != nullptr);
            // It is expected that only stderrSink is present
            ASSERT_EQ(logger->sinks().size(), 1);
            logger->sinks().clear();
            logger->sinks().push_back(ostreamSink);
        }

        spdlog::set_pattern("%^%3!l:%n%$ - %v");
    }

private:
    StringBuffer buffer_;
    std::ostream stream_ = std::ostream{&buffer_};
};

TEST_F(LogServiceInitTests, DefaultLogLevel)
{
    auto const parsingErrors =
        config_.parse(ConfigFileJson{boost::json::object{{"log", boost::json::object{{"level", "warn"}}}}});
    ASSERT_FALSE(parsingErrors.has_value());
    std::string const logString = "some log";

    EXPECT_TRUE(LogService::init(config_));
    replaceSinks();

    for (auto const& channel : Logger::kCHANNELS) {
        Logger const log{channel};
        log.trace() << logString;
        ASSERT_TRUE(getLoggerString().empty());

        log.debug() << logString;
        ASSERT_TRUE(getLoggerString().empty());

        log.info() << logString;
        ASSERT_TRUE(getLoggerString().empty());

        log.warn() << logString;
        ASSERT_EQ(fmt::format("war:{} - {}\n", channel, logString), getLoggerString());

        log.error() << logString;
        ASSERT_EQ(fmt::format("err:{} - {}\n", channel, logString), getLoggerString());
    }
}

TEST_F(LogServiceInitTests, ChannelLogLevel)
{
    std::string const configStr = R"JSON(
    {
        "log": {
            "level": "error",
            "channels": [
                {
                    "channel": "Backend",
                    "level": "warning"
                }
            ]
        }
    }
    )JSON";

    auto const parsingErrors = config_.parse(ConfigFileJson{boost::json::parse(configStr).as_object()});
    ASSERT_FALSE(parsingErrors.has_value());
    std::string const logString = "some log";

    EXPECT_TRUE(LogService::init(config_));
    replaceSinks();

    for (auto const& channel : Logger::kCHANNELS) {
        Logger const log{channel};
        log.trace() << logString;
        ASSERT_TRUE(getLoggerString().empty());

        log.debug() << logString;
        ASSERT_TRUE(getLoggerString().empty());

        log.info() << logString;
        ASSERT_TRUE(getLoggerString().empty());

        log.warn() << logString;
        if (std::string_view{channel} == "Backend") {
            ASSERT_EQ(fmt::format("war:{} - {}\n", channel, logString), getLoggerString());
        } else {
            ASSERT_TRUE(getLoggerString().empty());
        }

        log.error() << logString;
        ASSERT_EQ(fmt::format("err:{} - {}\n", channel, logString), getLoggerString());
    }
}

TEST_F(LogServiceInitTests, InitReturnsErrorIfCouldNotCreateLogDirectory)
{
    // "/proc" directory is read only on any unix OS
    auto const parsingErrors =
        config_.parse(ConfigFileJson{boost::json::object{{"log", boost::json::object{{"directory", "/proc/logs"}}}}});
    ASSERT_FALSE(parsingErrors.has_value());

    auto const result = LogService::init(config_);
    EXPECT_FALSE(result);
    EXPECT_THAT(result.error(), testing::HasSubstr("Couldn't create logs directory"));
}

TEST_F(LogServiceInitTests, InitReturnsErrorIfProvidedInvalidChannel)
{
    auto const jsonStr = R"JSON(
    {
        "log": {
            "channels": [
                {
                    "channel": "SomeChannel",
                    "level": "warn"
                }
            ]
        }
    })JSON";

    auto const json = boost::json::parse(jsonStr).as_object();
    auto const parsingErrors = config_.parse(ConfigFileJson{json});
    ASSERT_FALSE(parsingErrors.has_value());

    auto const result = LogService::init(config_);
    EXPECT_FALSE(result);
    EXPECT_EQ(result.error(), "Can't override settings for log channel SomeChannel: invalid channel");
}

TEST_F(LogServiceInitTests, LogSizeAndHourRotationCannotBeZero)
{
    std::vector<std::string_view> const keys{"log.directory_max_files", "log.rotation_size"};

    auto const jsonStr = fmt::format(
        R"JSON(
            {{
                "{}": 0,
                "{}": 0
            }}
        )JSON",
        keys[0],
        keys[1]
    );

    auto const parsingErrors = config_.parse(ConfigFileJson{boost::json::parse(jsonStr).as_object()});
    ASSERT_EQ(parsingErrors->size(), 2);
    for (std::size_t i = 0; i < parsingErrors->size(); ++i) {
        EXPECT_EQ(
            (*parsingErrors)[i].error,
            fmt::format("{} Number must be between 1 and {}", keys[i], std::numeric_limits<uint32_t>::max())
        );
    }
}