// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

#pragma once

#include "common/log.h"
#include "common/string_util.h"
#include "common/file_util.h"

#include <cstring>
#include <set>
#include <mutex>

#define MAX_MESSAGES 8000
#define MAX_MSGLEN  1024


// pure virtual interface
class LogListener
{
public:
    virtual ~LogListener() {}

    virtual void Log(LogTypes::LOG_LEVELS, const char *msg) = 0;
};

class FileLogListener : public LogListener
{
public:
    FileLogListener(const char *filename);

    void Log(LogTypes::LOG_LEVELS, const char *msg) override;

    bool IsValid() { return !m_logfile.fail(); }
    bool IsEnabled() const { return m_enable; }
    void SetEnable(bool enable) { m_enable = enable; }

    const char* GetName() const { return "file"; }

private:
    std::mutex m_log_lock;
    std::ofstream m_logfile;
    bool m_enable;
};

class DebuggerLogListener : public LogListener
{
public:
    void Log(LogTypes::LOG_LEVELS, const char *msg) override;
};

class LogContainer
{
public:
    LogContainer(const char* shortName, const char* fullName, bool enable = false);

    const char* GetShortName() const { return m_shortName; }
    const char* GetFullName() const { return m_fullName; }

    void AddListener(LogListener* listener);
    void RemoveListener(LogListener* listener);

    void Trigger(LogTypes::LOG_LEVELS, const char *msg);

    bool IsEnabled() const { return m_enable; }
    void SetEnable(bool enable) { m_enable = enable; }

    LogTypes::LOG_LEVELS GetLevel() const { return m_level;    }

    void SetLevel(LogTypes::LOG_LEVELS level) {    m_level = level; }

    bool HasListeners() const { return !m_listeners.empty(); }

private:
    char m_fullName[128];
    char m_shortName[32];
    bool m_enable;
    LogTypes::LOG_LEVELS m_level;
    std::mutex m_listeners_lock;
    std::set<LogListener*> m_listeners;
};

class ConsoleListener;

class LogManager : NonCopyable
{
private:
    LogContainer* m_Log[LogTypes::NUMBER_OF_LOGS];
    FileLogListener *m_fileLog;
    ConsoleListener *m_consoleLog;
    DebuggerLogListener *m_debuggerLog;
    static LogManager *m_logManager;  // Singleton. Ugh.

    LogManager();
    ~LogManager();
public:

    static u32 GetMaxLevel() { return LogTypes::MAX_LOGLEVEL;    }

    void Log(LogTypes::LOG_LEVELS level, LogTypes::LOG_TYPE type, const char* file, int line,
        const char* function, const char *fmt, va_list args);

    void SetLogLevel(LogTypes::LOG_TYPE type, LogTypes::LOG_LEVELS level)
    {
        m_Log[type]->SetLevel(level);
    }

    void SetEnable(LogTypes::LOG_TYPE type, bool enable)
    {
        m_Log[type]->SetEnable(enable);
    }

    bool IsEnabled(LogTypes::LOG_TYPE type) const
    {
        return m_Log[type]->IsEnabled();
    }

    const char* GetShortName(LogTypes::LOG_TYPE type) const
    {
        return m_Log[type]->GetShortName();
    }

    const char* GetFullName(LogTypes::LOG_TYPE type) const
    {
        return m_Log[type]->GetFullName();
    }

    void AddListener(LogTypes::LOG_TYPE type, LogListener *listener)
    {
        m_Log[type]->AddListener(listener);
    }

    void RemoveListener(LogTypes::LOG_TYPE type, LogListener *listener)
    {
        m_Log[type]->RemoveListener(listener);
    }

    FileLogListener *GetFileListener() const
    {
        return m_fileLog;
    }

    ConsoleListener *GetConsoleListener() const
    {
        return m_consoleLog;
    }

    DebuggerLogListener *GetDebuggerListener() const
    {
        return m_debuggerLog;
    }

    static LogManager* GetInstance()
    {
        return m_logManager;
    }

    static void SetInstance(LogManager *logManager)
    {
        m_logManager = logManager;
    }

    static void Init();
    static void Shutdown();
};