/*
 *  This program 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.
 *
 *  This program 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * devicemanager.cpp
 * Implementation of the device manager, this object tracks what devices are in
 * use.
 * Copyright (C) 2005-2009 Simon Newton
 */

#include <stdio.h>
#include <errno.h>
#include <map>
#include <string>
#include <vector>

#include "ola/Logging.h"
#include "ola/StringUtils.h"
#include "olad/Port.h"
#include "olad/PortManager.h"
#include "olad/DeviceManager.h"

namespace ola {

const unsigned int DeviceManager::MISSING_DEVICE_ALIAS = 0;
const char DeviceManager::PORT_PREFERENCES[] = "port";
const char DeviceManager::PRIORITY_VALUE_SUFFIX[] = "_priority_value";
const char DeviceManager::PRIORITY_MODE_SUFFIX[] = "_priority_mode";

bool operator <(const device_alias_pair& left,
                const device_alias_pair &right) {
  if (left.alias < right.alias)
    return true;
  return false;
}


/*
 * Constructor
 */
DeviceManager::DeviceManager(PreferencesFactory *prefs_factory,
                             PortManager *port_manager)
    : m_port_preferences(NULL),
      m_port_manager(port_manager),
      m_next_device_alias(FIRST_DEVICE_ALIAS) {
  if (prefs_factory) {
    m_port_preferences = prefs_factory->NewPreference(PORT_PREFERENCES);
    m_port_preferences->Load();
  }
}


/*
 * Cleanup
 */
DeviceManager::~DeviceManager() {
  if (m_port_preferences)
    m_port_preferences->Save();
}


/*
 * Register a device
 * @param device pointer to the device to register
 * @return true on success, false on failure
 */
bool DeviceManager::RegisterDevice(AbstractDevice *device) {
  if (!device)
    return false;

  string device_id = device->UniqueId();

  if (device_id.empty()) {
    OLA_WARN << "Device: " << device->Name() << " is missing UniqueId";
    return false;
  }

  unsigned int alias;
  map<string, device_alias_pair>::iterator iter = m_devices.find(device_id);
  if (iter != m_devices.end()) {
    if (iter->second.device) {
      // already registered
      OLA_INFO << "Device " << device_id << " is already registered";
      return false;
    } else {
      // was previously registered, reuse alias
      alias = iter->second.alias;
      iter->second.device = device;
    }
  } else {
    alias = m_next_device_alias++;
    device_alias_pair pair;
    pair.alias = alias;
    pair.device = device;
    m_devices[device_id] = pair;
  }

  m_alias_map[alias] = device;
  OLA_INFO << "Installed device: " << device->Name() << ":" <<
    device->UniqueId();

  RestoreDevicePortSettings(device);
  return true;
}


/*
 * Unregister a device
 * @param device_id the id of the device to remove
 * @return true on sucess, false on failure
 */
bool DeviceManager::UnregisterDevice(const string &device_id) {
  map<string, device_alias_pair>::iterator iter =
    m_devices.find(device_id);

  if (iter == m_devices.end() || !iter->second.device) {
    OLA_WARN << "Device " << device_id << "not found";
    return false;
  }

  SaveDevicePortSettings(iter->second.device);
  map<unsigned int, AbstractDevice*>::iterator alias_iter =
    m_alias_map.find(iter->second.alias);

  if (alias_iter != m_alias_map.end())
    m_alias_map.erase(alias_iter);

  iter->second.device = NULL;
  return true;
}

/*
 * Unregister a Device
 * @param device a pointer to the device
 * @return true on sucess, false on failure
 */
bool DeviceManager::UnregisterDevice(const AbstractDevice *device) {
  if (!device)
    return false;

  string device_id = device->UniqueId();
  if (device_id.empty())
    return false;

  return UnregisterDevice(device_id);
}


/*
 * Return the number of active devices
 * @return the number of active devices
 */
unsigned int DeviceManager::DeviceCount() const {
  unsigned int count = 0;
  map<string, device_alias_pair>::const_iterator iter;
  for (iter = m_devices.begin(); iter != m_devices.end(); ++iter)
    if (iter->second.device)
      count++;

  return count;
}


/*
 * Return a list of all the devices
 * @return a vector of device_alias_pairs
 */
vector<device_alias_pair> DeviceManager::Devices() const {
  vector<device_alias_pair> result;
  map<string, device_alias_pair>::const_iterator iter;
  for (iter = m_devices.begin(); iter != m_devices.end(); ++iter)
    if (iter->second.device)
      result.push_back(iter->second);

  return result;
}


/*
 * Find the device with the given alias.
 * @return a pointer to the device or NULL if the device wasn't found.
 */
AbstractDevice *DeviceManager::GetDevice(unsigned int alias) const {
  map<unsigned int, AbstractDevice*>::const_iterator alias_iter =
    m_alias_map.find(alias);
  if (alias_iter != m_alias_map.end())
    return alias_iter->second;
  return NULL;
}


/*
 * Return the device_alias_pair corresponding to the device with the given ID.
 * @param unique_id the unique id of the device
 * @return a device_alias_pair, if the device isn't found the alias is set to
 * MISSING_DEVICE_ALIAS and the device pointer is NULL.
 */
device_alias_pair DeviceManager::GetDevice(const string &unique_id) const {
  device_alias_pair result;
  map<string, device_alias_pair>::const_iterator iter =
    m_devices.find(unique_id);

  if (iter != m_devices.end() && iter->second.device)
      return iter->second;

  result.alias = MISSING_DEVICE_ALIAS;
  result.device = NULL;
  return result;
}


/*
 * Remove all devices and reset the device counter
 */
void DeviceManager::UnregisterAllDevices() {
  map<string, device_alias_pair>::iterator iter;
  for (iter = m_devices.begin(); iter != m_devices.end(); ++iter) {
    SaveDevicePortSettings(iter->second.device);
    iter->second.device = NULL;
  }
  m_alias_map.clear();
}


/*
 * Save the port universe patchings for a device
 * @param device the device to save the settings for
 */
void DeviceManager::SaveDevicePortSettings(const AbstractDevice *device) {
  if (!m_port_preferences || !device)
    return;

  vector<InputPort*> input_ports;
  vector<OutputPort*> output_ports;
  device->InputPorts(&input_ports);
  device->OutputPorts(&output_ports);
  SavePortPatchings(input_ports);
  SavePortPatchings(output_ports);

  vector<InputPort*>::const_iterator input_iter = input_ports.begin();
  for (; input_iter != input_ports.end(); ++input_iter)
    SavePortPriority(**input_iter);
  vector<OutputPort*>::const_iterator output_iter = output_ports.begin();
  for (; output_iter != output_ports.end(); ++output_iter)
    SavePortPriority(**output_iter);
}


/*
 * Restore the port universe patchings for a list of ports.
 */
void DeviceManager::RestoreDevicePortSettings(AbstractDevice *device) {
  if (!m_port_preferences || !device)
    return;

  vector<InputPort*> input_ports;
  vector<OutputPort*> output_ports;
  device->InputPorts(&input_ports);
  device->OutputPorts(&output_ports);
  RestorePortPatchings(input_ports);
  RestorePortPatchings(output_ports);

  vector<InputPort*>::const_iterator input_iter = input_ports.begin();
  for (; input_iter != input_ports.end(); ++input_iter)
    RestorePortPriority(*input_iter);
  vector<OutputPort*>::const_iterator output_iter = output_ports.begin();
  for (; output_iter != output_ports.end(); ++output_iter)
    RestorePortPriority(*output_iter);
}


/*
 * Save the patching information for a list of ports.
 */
template <class PortClass>
void DeviceManager::SavePortPatchings(const vector<PortClass*> &ports) const {
  typename vector<PortClass*>::const_iterator iter = ports.begin();
  while (iter != ports.end()) {
    string port_id = (*iter)->UniqueId();
    if (port_id.empty())
      return;

    if ((*iter)->GetUniverse()) {
      m_port_preferences->SetValue(
          port_id,
          IntToString((*iter)->GetUniverse()->UniverseId()));
    } else {
      m_port_preferences->RemoveValue(port_id);
    }
    iter++;
  }
}


/*
 * Save the priorities for all ports on this device
 */
void DeviceManager::SavePortPriority(const Port &port) const {
  if (port.PriorityCapability() == CAPABILITY_NONE)
    return;

  string port_id = port.UniqueId();
  if (port_id.empty())
    return;

  m_port_preferences->SetValue(port_id + PRIORITY_VALUE_SUFFIX,
                               IntToString(port.GetPriority()));

  if (port.PriorityCapability() == CAPABILITY_FULL)
    m_port_preferences->SetValue(port_id + PRIORITY_MODE_SUFFIX,
                                 IntToString(port.GetPriorityMode()));
}


/*
 * Restore the priority settings for a port
 */
void DeviceManager::RestorePortPriority(Port *port) const {
  if (port->PriorityCapability() == CAPABILITY_NONE)
    return;

  string port_id = port->UniqueId();
  if (port_id.empty())
    return;

  string priority_str = m_port_preferences->GetValue(
      port_id + PRIORITY_VALUE_SUFFIX);
  string priority_mode_str = m_port_preferences->GetValue(
      port_id + PRIORITY_MODE_SUFFIX);

  if (priority_str.empty() && priority_mode_str.empty())
    return;

  uint8_t priority, priority_mode;
  // setting the priority to overide mode first means we remember the over
  // value even if it's in inherit mode
  if (StringToUInt8(priority_str, &priority))
    m_port_manager->SetPriorityOverride(port, priority);

  if (StringToUInt8(priority_mode_str, &priority_mode)) {
    if (priority_mode == PRIORITY_MODE_INHERIT)
      m_port_manager->SetPriorityInherit(port);
  }
}


/*
 * Restore the patching information for a port.
 */
template <class PortClass>
void DeviceManager::RestorePortPatchings(
    const vector<PortClass*> &ports) const {
  typename vector<PortClass*>::const_iterator iter = ports.begin();
  while (iter != ports.end()) {
    PortClass *port = *iter;
    iter++;

    string port_id = port->UniqueId();
    if (port_id.empty())
      continue;

    string uni_id = m_port_preferences->GetValue(port_id);
    if (uni_id.empty())
      continue;

    errno = 0;
    int id = static_cast<int>(strtol(uni_id.data(), NULL, 10));
    if ((id == 0 && errno) || id < 0)
      continue;

    m_port_manager->PatchPort(port, id);
  }
}
}  // ola