/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <system/audio.h>
#include <system/audio_policy.h>
#include <utils/Errors.h>
#include <utils/RWLock.h>
#include <utils/RefBase.h>
#include <list>
#include <map>
#include <string>
#include <vector>

class CParameterMgrPlatformConnector;
class ISelectionCriterionInterface;
struct cnode;

class ParameterMgrPlatformConnectorLogger;

namespace android {
namespace audio_policy {

using ValuePair = std::pair<uint32_t, std::string>;
using ValuePairs = std::vector<ValuePair>;

class ParameterManagerWrapper
{
private:
    using Criteria = std::map<std::string, ISelectionCriterionInterface *>;

public:
    ParameterManagerWrapper(bool enableSchemaVerification = false,
                            const std::string &schemaUri = {});
    ~ParameterManagerWrapper();

    /**
     * Starts the platform state service.
     * It starts the parameter framework policy instance.
     * @param[out] contains human readable error if starts failed
     *
     * @return NO_ERROR if success, error code otherwise, and error is set to human readable string.
     */
    status_t start(std::string &error);

    /**
     * The following API wrap policy action to criteria
     */

    /**
     * Checks if the platform state was correctly started (ie the policy parameter manager
     * has been instantiated and started correctly).
     *
     * @todo: map on initCheck?
     *
     * @return true if platform state is started correctly, false otherwise.
     */
    bool isStarted();

    /**
     * Set Telephony Mode.
     * It will set the telephony mode criterion accordingly and apply the configuration in order
     * to select the right configuration on domains depending on this mode criterion.
     *
     * @param[in] mode: Android Phone state (normal, ringtone, csv, in communication)
     *
     * @return NO_ERROR if criterion set correctly, error code otherwise.
     */
    status_t setPhoneState(audio_mode_t mode);

    audio_mode_t getPhoneState() const;

    /**
     * Set Force Use config for a given usage.
     * It will set the corresponding policy parameter framework criterion.
     *
     * @param[in] usage for which a configuration shall be forced.
     * @param[in] config wished to be forced for the given shall.
     *
     * @return NO_ERROR if the criterion was set correctly, error code otherwise (e.g. config not
     * allowed a given usage...)
     */
    status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config);

    audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage) const;

    /**
     * Set the available input devices i.e. set the associated policy parameter framework criterion
     *
     * @param[in] inputDevices mask of available input devices.
     *
     * @return NO_ERROR if devices criterion updated correctly, error code otherwise.
     */
    status_t setAvailableInputDevices(audio_devices_t inputDevices);

    /**
     * Set the available output devices i.e. set the associated policy parameter framework criterion
     *
     * @param[in] outputDevices mask of available output devices.
     *
     * @return NO_ERROR if devices criterion updated correctly, error code otherwise.
     */
    status_t setAvailableOutputDevices(audio_devices_t outputDevices);

    /**
     * @brief setDeviceConnectionState propagates a state event on a given device(s)
     * @param type bit mask of the device whose state has changed
     * @param address of the device whose state has changed
     * @param state new state of the given device
     * @return NO_ERROR if new state corretly propagated to Engine Parameter-Framework, error
     * code otherwise.
     */
    status_t setDeviceConnectionState(audio_devices_t type, const std::string address,
                                      audio_policy_dev_state_t state);

    /**
     * @brief addCriterion to the policy pfw
     * @param name of the criterion
     * @param isInclusive if true, inclusive, if false exclusive criterion type
     * @param pairs of numerical/literal values of the criterion
     * @param defaultValue provided as literal.
     * @return
     */
    status_t addCriterion(const std::string &name, bool isInclusive, ValuePairs pairs,
                          const std::string &defaultValue);

private:
    /**
     * Apply the configuration of the platform on the policy parameter manager.
     * Once all the criteria have been set, the client of the platform state must call
     * this function in order to have the route PFW taking into account these criteria.
     *
     * OPENS: shall we expose this?
     *      - Yes if atomic set operation.
     *          In this case, abstract it behind the "STAGE AND COMMIT" pattern
     *      - no if need to set more than one before triggering an apply configuration.
     */
    void applyPlatformConfiguration();

     /**
     * Retrieve an element from a map by its name.
     *
     * @tparam T type of element to search.
     * @param[in] name name of the element to find.
     * @param[in] elementsMap maps of elements to search into.
     *
     * @return valid pointer on element if found, NULL otherwise.
     */
    template <typename T>
    T *getElement(const std::string &name, std::map<std::string, T *> &elementsMap);

    /**
     * Retrieve an element from a map by its name. Const version.
     *
     * @tparam T type of element to search.
     * @param[in] name name of the element to find.
     * @param[in] elementsMap maps of elements to search into.
     *
     * @return valid pointer on element if found, NULL otherwise.
     */
    template <typename T>
    const T *getElement(const std::string &name,
                        const std::map<std::string, T *> &elementsMap) const;

    /**
     * set the value of a component state.
     *
     * @param[in] value new value to set to the component state.
     * @param[in] stateName of the component state.
     */
    void setValue(int value, const std::string &stateName);

    /**
     * get the value of a component state.
     *
     * @param[in] name of the component state.
     *
     * @return value of the component state
     */
    int getValue(const std::string &stateName) const;

    bool isValueValidForCriterion(ISelectionCriterionInterface *criterion, int valueToCheck);

    Criteria mPolicyCriteria; /**< Policy Criterion Map. */

    CParameterMgrPlatformConnector *mPfwConnector; /**< Policy Parameter Manager connector. */
    ParameterMgrPlatformConnectorLogger *mPfwConnectorLogger; /**< Policy PFW logger. */


    /**
     * provide a compile time error if no specialization is provided for a given type.
     *
     * @tparam T: type of the parameter manager element. Supported one are:
     *                      - Criterion
     *                      - CriterionType.
     */
    template <typename T>
    struct parameterManagerElementSupported;

    static const char *const mPolicyPfwDefaultConfFileName; /**< Default Policy PFW top file name.*/
    static const char *const mPolicyPfwVendorConfFileName; /**< Vendor Policy PFW top file name.*/
};

} // namespace audio_policy
} // namespace android