// Copyright 2009 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <cstdarg>
#include <fstream>
#include <mutex>
#include <set>
#include <string>

#include "Common/BitSet.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
#include "Common/NonCopyable.h"

#define MAX_MSGLEN 1024

// pure virtual interface
class LogListener
{
public:
  virtual ~LogListener() {}
  virtual void Log(LogTypes::LOG_LEVELS, const char* msg) = 0;

  enum LISTENER
  {
    FILE_LISTENER = 0,
    CONSOLE_LISTENER,
    LOG_WINDOW_LISTENER,

    NUMBER_OF_LISTENERS  // Must be last
  };
};

class FileLogListener : public LogListener
{
public:
  FileLogListener(const std::string& filename);

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

  bool IsValid() const { return m_logfile.good(); }
  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 LogContainer
{
public:
  LogContainer(const std::string& shortName, const std::string& fullName, bool enable = false);

  std::string GetShortName() const { return m_shortName; }
  std::string GetFullName() const { return m_fullName; }
  void AddListener(LogListener::LISTENER id) { m_listener_ids[id] = 1; }
  void RemoveListener(LogListener::LISTENER id) { m_listener_ids[id] = 0; }
  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 bool(m_listener_ids); }
  typedef class BitSet32::Iterator iterator;
  iterator begin() const { return m_listener_ids.begin(); }
  iterator end() const { return m_listener_ids.end(); }
private:
  std::string m_fullName;
  std::string m_shortName;
  bool m_enable;
  LogTypes::LOG_LEVELS m_level;
  BitSet32 m_listener_ids;
};

class ConsoleListener;

class LogManager : NonCopyable
{
private:
  LogContainer* m_Log[LogTypes::NUMBER_OF_LOGS];
  static LogManager* m_logManager;  // Singleton. Ugh.
  std::array<LogListener*, LogListener::NUMBER_OF_LISTENERS> m_listeners;

  LogManager();
  ~LogManager();

public:
  static u32 GetMaxLevel() { return MAX_LOGLEVEL; }
  void Log(LogTypes::LOG_LEVELS level, LogTypes::LOG_TYPE type, const char* file, int line,
           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, LogTypes::LOG_LEVELS level = LogTypes::LNOTICE) const
  {
    return m_Log[type]->IsEnabled() && m_Log[type]->GetLevel() >= level;
  }

  std::string GetShortName(LogTypes::LOG_TYPE type) const { return m_Log[type]->GetShortName(); }
  std::string GetFullName(LogTypes::LOG_TYPE type) const { return m_Log[type]->GetFullName(); }
  void RegisterListener(LogListener::LISTENER id, LogListener* listener)
  {
    m_listeners[id] = listener;
  }

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

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

  static LogManager* GetInstance() { return m_logManager; }
  static void SetInstance(LogManager* logManager) { m_logManager = logManager; }
  static void Init();
  static void Shutdown();
};