/*
 * psquest.h
 *
 * Copyright (C) 2005 Atomic Blue (info@planeshift.it, http://www.atomicblue.org) 
 *
 *
 * 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 (version 2 of the License)
 * 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 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.
 *
 */

#ifndef __PSQUESTPREREQOPS_H__
#define __PSQUESTPREREQOPS_H__


#include <csutil/array.h>

/**
 * Pure virtual base quest prerequisite operator class
 *
 * This base class define the needed functions for every 
 * prerequisite operator.
 */
class psQuestPrereqOp 
{
 public:
    /**
     * Destructor for the prerequisite operator.
     *
     */
    virtual ~psQuestPrereqOp() {};

    /**
     * Check for valid prerequisite 
     *
     * Override this function to generate a test for any prerequisite.
     *
     * @param  character The character that are checking for a trigger
     * @return True if the prerequisite is true and the trigger holding
     *         the prerequisite should be available.
     */
    virtual bool Check(psCharacter * character) = 0;

    /**
     * Convert the prerequisite script to a xml string
     *
     * Wrapps the operator in <pre>...</pre> tags.
     *
     * @return XML string for the prerequisite script.
     */
    virtual csString GetScript();

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Override this function to return the prerequisite xml tag for your new
     * operator.
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp() = 0;

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy() = 0;
};

/**
 * Basis list prerequisite operator. 
 *
 * Define basic operations for operations needing any number of
 * prerequisites to be complete. Like an and operator with any numbers
 * of childs.
 */
class psQuestPrereqOpList: public psQuestPrereqOp
{
 protected:
    /**
     * The list of child prerequisite operators for this list operator.
     */
    csArray<psQuestPrereqOp*> prereqlist;
 public:

    /**
     * Destructor for the list prerequisite operator.
     *
     * Will delete any prerequisite pushed on to the list 
     * of child prerequisites.
     */
    virtual ~psQuestPrereqOpList();

    /**
     * Push a new child prerequisite onto the child list.
     *
     * Add another prerequisite operator to the list of childs 
     * for this list prerequisite.
     *
     * @param  prereqOp The prerequisite operator to be appended to the list.
     */
    virtual void Push(psQuestPrereqOp* prereqOp);

    /**
     * Insert a new child prerequisite onto the child list.
     *
     * Add another prerequisite operator to the list of childs 
     * for this list prerequisite.
     *
     * @param  n Insert the \c prereqOp before prerequisite \c n
     * @param  prereqOp The prerequisite operator to be inserted to the list.
     */
    virtual void Insert(size_t n, psQuestPrereqOp* prereqOp);    

};

/**
 * And Prerequisite operator.
 * 
 * A multi term and operaotr. Every prerequisite have to be true
 * for this operator to be valid.
 */
class psQuestPrereqOpAnd: public psQuestPrereqOpList
{
 public:

    /**
     * Destructor for the and prerequisite operator.
     */
    virtual ~psQuestPrereqOpAnd() {}
    
    /**
     * Check if all child prerequisites are true
     *
     * prerequisite = child1 and child2 and ... childN
     *
     * @param  character The character that are checking for a prerequisite
     * @return True if all the child prerequisites are true
     */
    virtual bool Check(psCharacter * character);

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Convert the operator to the xml string:
     * <and><child1/>...<childN/></and>
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp();

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy();
};


/**
 * Or prerequisite operator.
 * 
 * A multi term or operaotr. One prerequisite have to be true
 * for this operator to be valid.
 */
class psQuestPrereqOpOr: public psQuestPrereqOpList
{
 public:

    /**
     * Destructor for the or prerequisite operator.
     */
    virtual ~psQuestPrereqOpOr() {}

    /**
     * Check if any of the child prerequisites are true
     *
     * prerequisite = child1 or child 2 or ... childN
     *
     * @param  character The character that are checking for a prerequisite
     * @return True if one the child prerequisites are true
     */
    virtual bool Check(psCharacter * character);

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Convert the operator to the xml string:
     * <or><child1/>...<childN/></or>
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp();

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy();
};

/**
 * Require prerequisite operator.
 * 
 * A multi term require operator. The given minimum and/or maximum of
 * childs have to be completed for this prerequisite to be true.
 */
class psQuestPrereqOpRequire: public psQuestPrereqOpList
{
    int min,max;
 public:

    /**
     * Construct a require operator.
     *
     * @param min_required   The minimum of childs needed. There are no lower
     *                       limit if this is set to -1.
     * @param max_required   The maximum of childs needed. There are no upper
     *                       limit if this is set to -1.
     */
    psQuestPrereqOpRequire(int min_required,int max_required);

    /**
     * Destructor for the require prerequisite operator.
     */
    virtual ~psQuestPrereqOpRequire() {}
    
    /**
     * Check if a number of prerequisites are true. Limited by
     * a min and a max number. If any of thise are -1 the limit
     * will be ignored.
     *
     * number = number of childs true
     * prerequisite = number >= min and number <= max
     *
     * @param  character The character that are checking for a prerequisite
     * @return True if more than min and less than max of the child prerequisites are true
     */
    virtual bool Check(psCharacter * character);

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Convert the operator into the xml string: 
     * <require [min="min"] [max="max"]><child1>...<childN></require>
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp();

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy();
};

/**
 * Not prerequisite operator.
 * 
 * Invert the result of the one child.
 */
class psQuestPrereqOpNot: public psQuestPrereqOpList
{
 public:

    /**
     * Destructor for the not prerequisite operator.
     */
    virtual ~psQuestPrereqOpNot() {}

    /**
     * Check if the child prerequisite is false.
     *
     * prerequisite = not child
     *
     * @param  character The character that are checking for a prerequisite
     * @return True if the one child prerequisite is false
     */
    virtual bool Check(psCharacter * character);

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Convert the operator into the xml string: 
     * <not><child></not>
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp();

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy();
};

/**
 * Quest Completed prerequisite operator.
 *
 * The given quest have to be completed for this prerequisite
 * to be true.
 */
class psQuestPrereqOpQuestCompleted: public psQuestPrereqOp
{
 protected:
    /**
     * The quest that need to be completed.
     */
    psQuest * quest;
 public:

    /**
     * Construct a quest completed operator
     *
     * @param quest The quest that need to be completed
     */
    psQuestPrereqOpQuestCompleted(psQuest * quest):quest(quest){};

    /**
     * Destructor for the quest completed prerequisite operator.
     */
    virtual ~psQuestPrereqOpQuestCompleted() {}

    /**
     * Check if the given quest is completed.
     *
     * prerequisite = Is the quest completed.
     *
     * @param  character The character that are checking for a prerequisite
     * @return True if the charachter have completed the given quest.
     */
    virtual bool Check(psCharacter * character);

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Convert the operator into the xml string:
     * <completed quest="quest name"/>
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp();

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy();
};

/**
 * Quest assigned prerequisite operator.
 *
 * The given quest have to be assigned for this prerequisite
 * to be true.
 */
class psQuestPrereqOpQuestAssigned: public psQuestPrereqOp
{
 protected:
    /**
     * The quest that need to be assigned.
     */
    psQuest * quest;
 public:

    /**
     * Construct a quest assigned operator
     *
     * @param quest The quest that need to be assigned.
     */
    psQuestPrereqOpQuestAssigned(psQuest * quest):quest(quest){};

    /**
     */
    virtual ~psQuestPrereqOpQuestAssigned() {}

    /**
     * Check if the given quest is assigned.
     *
     * prerequisite = Is the quest assigned.
     *
     * @param  character The character that are checking for a prerequisite
     * @return True if the character have assigned the given quest.
     */
    virtual bool Check(psCharacter * character);

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Convert the operator into the xml string: 
     * <assigned quest="quest name"/>
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp();

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy();
};

/**
 * Quest Completed Category operator
 *
 * Need to have completed a number of quests for a given category.
 */
class psQuestPrereqOpQuestCompletedCategory: public psQuestPrereqOp
{
 protected:

    /**
     * The minimum of quest in the given category that need to be completed.
     */
    int min;

    /**
     * The maximum of quest in the given category that need to be completed.
     */
    int max;

    /**
     * The category that will be tested for.
     */
    csString category;
 public:

    /**
     * Construct a quest completed category opererator
     *
     * @param quest_category The category that the user is tested agains.
     * @param min_required   The minimum of quests needed. There are no lower
     *                       limit if this is set to -1.
     * @param max_required   The maximum of quests needed. There are no upper
     *                       limit if this is set to -1.
     */
    psQuestPrereqOpQuestCompletedCategory(csString quest_category,
                                          int min_required,int max_required)
        :category(quest_category),min(min_required),max(max_required){};

    /**
     * Destructor for the quest completed category prerequisite operator.
     */
    virtual ~psQuestPrereqOpQuestCompletedCategory() {}

    /**
     * Check if the charater have completed a number quests with the given category.
     *
     * number = number of quests completed in the given category.
     * prerequisite = number >= min and number <= max
     *
     * @param  character The character that are checking for a prerequisite
     * @return True if more than min and less than max quests of the given category is completed.
     */
    virtual bool Check(psCharacter * character);

    /**
     * Convert the prerequisite operator to a xml string
     *
     * Convert the operator into the xml string: <completed category="category" [min="min"] [max="max"] />
     *
     * @return XML string for the prerequisite operator.
     */
    virtual csString GetScriptOp();

    /**
     * Copy the prerequisite operator
     *
     * Override this function to return a copy of the prerequisite
     * operator.
     *
     * @return Copy of the prerequisite operator.
     */
    virtual psQuestPrereqOp* Copy();
};

#endif