/*
 * 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.
 */

#ifndef _INIT_ACTION_H
#define _INIT_ACTION_H

#include <map>
#include <queue>
#include <string>
#include <vector>

class Action {
public:
    Action();

    void AddCommand(int (*f)(int nargs, char** args),
                    const std::vector<std::string>& args,
                    const std::string& filename = "", int line = 0);
    bool InitTriggers(const std::vector<std::string>& args, std::string* err);
    bool InitSingleTrigger(const std::string& trigger);
    std::size_t NumCommands() const;
    void ExecuteOneCommand(std::size_t command) const;
    void ExecuteAllCommands() const;
    bool CheckEventTrigger(const std::string& trigger) const;
    bool CheckPropertyTrigger(const std::string& name,
                              const std::string& value) const;
    bool TriggersEqual(const class Action& other) const;
    std::string BuildTriggersString() const;
    void DumpState() const;

private:
    class Command;

    void ExecuteCommand(const Command& command) const;
    bool CheckPropertyTriggers(const std::string& name = "",
                               const std::string& value = "") const;
    bool ParsePropertyTrigger(const std::string& trigger, std::string* err);

    std::map<std::string, std::string> property_triggers_;
    std::string event_trigger_;
    std::vector<Command*> commands_;
};

class ActionManager {
public:
    static ActionManager& GetInstance();
    void QueueEventTrigger(const std::string& trigger);
    void QueuePropertyTrigger(const std::string& name, const std::string& value);
    void QueueAllPropertyTriggers();
    void QueueBuiltinAction(int (*func)(int nargs, char** args),
                            const std::string& name);
    void ExecuteOneCommand();
    bool HasMoreCommands() const;
    Action* AddNewAction(const std::vector<std::string>& triggers,
                         std::string* err);
    void DumpState() const;

private:
    ActionManager();

    ActionManager(ActionManager const&) = delete;
    void operator=(ActionManager const&) = delete;

    std::vector<Action*> action_list_;
    std::queue<Action*> action_queue_;
    std::size_t cur_command_;
};

#endif