/*
 * Copyright (C) 2007-2019 Xagasoft, All rights reserved.
 *
 * This file is part of the libbu++ library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#ifndef BU_ARRAY_H
#define BU_ARRAY_H

#include <memory>
#include "bu/exceptionbase.h"
#include "bu/archivebase.h"
#include "bu/sharedcore.h"

namespace Bu
{
    subExceptionDecl( ArrayException )

    template<typename value, int inc, typename valuealloc>
    class Array;

    /** @cond DEVEL */
    template<typename value, int inc, typename valuealloc>
    class ArrayCore
    {
    friend class Array<value, inc, valuealloc>;
    friend class SharedCore<
        Array<value, inc, valuealloc>,
        ArrayCore<value, inc, valuealloc>
        >;
    private:        
        ArrayCore() :
            pData( NULL ),
            iSize( 0 ),
            iCapacity( 0 )
        { }

        void setCapacity( int iNewLen )
        {
            //clear();
            //iCapacity = iCapacity;
            //pData = va.allocate( iCapacity );
            if( iNewLen <= iCapacity ) return;
            value *pNewData = va.allocate( iNewLen );
            if( pData )
            {
                for( int j = 0; j < iSize; j++ )
                {
                    va.construct( &pNewData[j], pData[j] );
                    va.destroy( &pData[j] );
                }
                va.deallocate( pData, iCapacity );
            }
            pData = pNewData;
            iCapacity = iNewLen;
        }

        virtual ~ArrayCore()
        {
            clear();
        }

        void clear()
        {
            if( pData )
            {
                for( int j = 0; j < iSize; j++ )
                {
                    va.destroy( &pData[j] );
                }
                va.deallocate( pData, iCapacity );
                pData = NULL;
            }
            iSize = 0;
            iCapacity = 0;
        }

        void erase( int iPos )
        {
            for( int j = iPos; j < iSize; j++ )
            {
                va.destroy( &pData[j] );
                if( j == iSize-1 )
                {
                    iSize--;
                    return;
                }
                va.construct( &pData[j], pData[j+1] );
            }
        }

        void swapErase( int iPos )
        {
            if( iPos == iSize-1 )
            {
                erase( iPos );
                return;
            }
            va.destroy( &pData[iPos] );
            va.construct( &pData[iPos], pData[iSize-1] );
            va.destroy( &pData[iSize-1] );
            iSize--;
        }

        valuealloc va;
        value *pData;
        long iSize;
        long iCapacity;
    };
    /** @endcond */

    /**
     * Array type container, just like a normal array only flexible and keeps
     * track of your memory for you.
     *
     *@param value (typename) The type of data to store in your list
     *@param valuealloc (typename) Memory Allocator for your value type
     *@param linkalloc (typename) Memory Allocator for the list links.
     *@ingroup Containers
     */
    template<typename value, int inc=10, typename valuealloc=std::allocator<value> >
    class Array : public SharedCore<
                  Array<value, inc, valuealloc>,
                  ArrayCore<value, inc, valuealloc>
                  >
    {
    private:
        typedef class Array<value, inc, valuealloc> MyType;
        typedef class ArrayCore<value, inc, valuealloc> Core;

    protected:
        using SharedCore<MyType, Core>::core;
        using SharedCore<MyType, Core>::_hardCopy;
        using SharedCore<MyType, Core>::_resetCore;
        using SharedCore<MyType, Core>::_allocateCore;

    public:
        struct const_iterator;
        struct iterator;

        Array()
        {
        }

        Array( const MyType &src ) :
            SharedCore<MyType, Core >( src )
        {
        }
        
        Array( long iSetCap )
        {
            setCapacity( iSetCap );
        }

        ~Array()
        {
        }

        bool operator==( const MyType &src ) const
        {
            if( core == src.core )
                return true;
            if( core->iSize != src.core->iSize )
                return false;

            for( int j = 0; j < core->iSize; j++ )
            {
                if( core->pData[j] != src.core->pData[j] )
                    return false;
            }
            return true;
        }

        bool operator!=( const MyType &src ) const
        {
            return !(*this == src);
        }

        /**
         * Clear the array.
         */
        void clear()
        {
            _resetCore();
        }

        MyType &append( const value &rVal )
        {
            _hardCopy();
            if( core->iSize == core->iCapacity )
            {
                core->setCapacity( core->iCapacity + inc );
            }

            core->va.construct( &core->pData[core->iSize++], rVal );

            return *this;
        }
        
        MyType &append( const MyType &rVal )
        {
            _hardCopy();

            if( core->iSize + rVal.core->iSize > core->iCapacity )
            {
                core->setCapacity( core->iSize + rVal.core->iSize + inc );
            }
            
            for( int j = 0; j < rVal.core->iSize; j++ )
            {
                core->va.construct(
                    &core->pData[core->iSize++],
                    rVal.core->pData[j]
                    );
            }

            return *this;
        }

        //operator
        value &operator[]( long iIndex )
        {
            _hardCopy();
            if( iIndex < 0 || iIndex >= core->iSize )
                throw ArrayException(
                    "Index %d out of range 0:%d", iIndex, core->iSize );

            return core->pData[iIndex];
        }
        
        const value &operator[]( long iIndex ) const
        {
            if( iIndex < 0 || iIndex >= core->iSize )
                throw ArrayException(
                    "Index %d out of range 0:%d", iIndex, core->iSize );

            return core->pData[iIndex];
        }

        value &get( long iIndex )
        {
            _hardCopy();
            if( iIndex < 0 || iIndex >= core->iSize )
                throw ArrayException(
                    "Index %d out of range 0:%d", iIndex, core->iSize );

            return core->pData[iIndex];
        }

        const value &get( long iIndex ) const
        {
            if( iIndex < 0 || iIndex >= core->iSize )
                throw ArrayException(
                    "Index %d out of range 0:%d", iIndex, core->iSize );

            return core->pData[iIndex];
        }

        value &first()
        {
            _hardCopy();
            return core->pData[0];
        }

        const value &first() const
        {
            return core->pData[0];
        }

        value &last()
        {
            _hardCopy();
            return core->pData[core->iSize-1];
        }

        const value &last() const
        {
            return core->pData[core->iSize-1];
        }

        /**
         * Returns true if the array is empty.  The capacity has no bearing on
         * this, only the size.
         */
        bool isEmpty() const
        {
            return core->iSize==0;
        }

        /**
         * Get the current size of the array.
         *@returns The current size of the array.
         */
        long getSize() const
        {
            return core->iSize;
        }

        void setSize( long iNewLen )
        {
            if( core->iSize == iNewLen )
                return;

            _hardCopy();
            if( iNewLen > core->iCapacity )
            {
                core->setCapacity( iNewLen );
            }
            if( iNewLen > core->iSize )
            {
                for( int j = core->iSize; j < iNewLen; j++ )
                {
                    core->va.construct(
                        &core->pData[j]
                        );
                }
            }
            core->iSize = iNewLen;
        }

        void setSize( long iNewLen, const value &initTo )
        {
            if( core->iSize == iNewLen )
                return;

            _hardCopy();
            if( iNewLen > core->iCapacity )
            {
                core->setCapacity( iNewLen );
            }
            if( iNewLen > core->iSize )
            {
                for( int j = core->iSize; j < iNewLen; j++ )
                {
                    core->va.construct(
                        &core->pData[j],
                        initTo
                        );
                }
            }
            core->iSize = iNewLen;
        }

        /**
         * Get the capacity of the array.  This number will grow as data is
         * added, and is mainly for the curious, it doesn't really determine
         * much for the end user.
         *@returns The current capacity of the array.
         */
        long getCapacity() const
        {
            return core->iCapacity;
        }

        /**
         * Change the capacity of the array, very useful if you know you'll be
         * adding a large amount of already counted items to the array, makes
         * the appending much faster afterwords.
         *@param iNewLen The new capacity of the array.
         *@todo Set this up so it can reduce the size of the array as well as
         * make it bigger.
         */
        void setCapacity( long iNewLen )
        {
            _hardCopy();
            core->setCapacity( iNewLen );
        }

        typedef struct iterator
        {
            friend class Array<value, inc, valuealloc>;
        private:
            iterator( MyType &src, long iPos=0 ) :
                src( src ),
                iPos( iPos )
            {
                if( this->iPos >= src.getSize() )
                    this->iPos = -1;
            }

            MyType &src;
            long iPos;

        public:
            iterator() :
                src( NULL ),
                iPos( -1 )
            {
            }

            iterator( const iterator &rSrc ) :
                src( rSrc.src ),
                iPos( rSrc.iPos )
            {
            }

            iterator operator++( int )
            {
                if( iPos < 0 )
                {
                    throw ArrayException(
                        "Cannot increment iterator past end of array.");
                }
                iPos++;
                if( iPos >= src.getSize() )
                {
                    iPos = -1;
                }
                return *this;
            }
            
            iterator operator++()
            {
                if( iPos >= 0 )
                    iPos++;
                if( iPos >= src.getSize() )
                    iPos = -1;
                return *this;
            }
            
            iterator operator+( int iAmnt )
            {
                if( iPos < 0 )
                {
                    throw ArrayException(
                        "Cannot increment iterator past end of array.");
                }
                iPos += iAmnt;
                if( iPos >= src.getSize() )
                    iPos = -1;
                return *this;
            }
            
            iterator operator--( int )
            {
                if( iPos < 0 )
                {
                    throw ArrayException(
                        "Cannot increment iterator past end of array.");
                }
                iPos--;
                if( iPos < 0 )
                    iPos = -1;
                return *this;
            }
            
            iterator operator--()
            {
                if( iPos < src.getSize() )
                    iPos--;
                if( iPos <= 0 )
                    iPos = -1;
                return *this;
            }
            
            iterator operator-( int iAmnt )
            {
                if( iPos < src.getSize() )
                    iPos -= iAmnt;
                if( iPos <= 0 )
                    iPos = -1;
                return *this;
            }

            bool operator==( const iterator &oth ) const
            {
                return iPos == oth.iPos;
            }

            bool operator!=( const iterator &oth ) const
            {
                return iPos != oth.iPos;
            }

            iterator operator=( const iterator &oth )
            {
                if( &src != &oth.src )
                    throw ArrayException(
                        "Cannot mix iterators from different array objects.");
                iPos = oth.iPos;
            }

            value &operator*()
            {
                if( iPos < 0 )
                    throw ArrayException(
                        "Cannot dereference finished iterator.");
                return src[iPos];
            }

            long getIndex() const
            {
                return iPos;
            }

            operator bool() const
            {
                return iPos >= 0;
            }

            bool isValid() const
            {
                return iPos >= 0;
            }
        } iterator;
        
        typedef struct const_iterator
        {
            friend class Array<value, inc, valuealloc>;
        private:
            const_iterator( const MyType &src, long iPos=0 ) :
                src( src ),
                iPos( iPos )
            {
                if( this->iPos >= src.getSize() )
                    this->iPos = -1;
            }

            const MyType &src;
            long iPos;

        public:
            const_iterator( const iterator &rSrc ) :
                src( rSrc.src ),
                iPos( rSrc.iPos )
            {
            }
            
            const_iterator( const const_iterator &rSrc ) :
                src( rSrc.src ),
                iPos( rSrc.iPos )
            {
            }

            const_iterator operator++( int )
            {
                if( iPos < 0 )
                {
                    throw ArrayException(
                        "Cannot increment iterator past end of array.");
                }
                iPos++;
                if( iPos >= src.getSize() )
                    iPos = -1;
                return *this;
            }
            
            const_iterator operator++()
            {
                if( iPos >= 0 )
                    iPos++;
                if( iPos >= src.getSize() )
                    iPos = -1;
                return *this;
            }
            
            const_iterator operator--( int )
            {
                if( iPos < 0 )
                {
                    throw ArrayException(
                        "Cannot increment iterator past end of array.");
                }
                iPos--;
                if( iPos < 0 )
                    iPos = -1;
                return *this;
            }
            
            const_iterator operator--()
            {
                if( iPos < src.getSize() )
                    iPos--;
                if( iPos <= 0 )
                    iPos = -1;
                return *this;
            }

            bool operator==( const const_iterator &oth ) const
            {
                return iPos == oth.iPos;
            }

            bool operator!=( const const_iterator &oth ) const
            {
                return iPos != oth.iPos;
            }

            const_iterator operator=( const const_iterator &oth )
            {
                if( &src != &oth.src )
                    throw ArrayException(
                        "Cannot mix iterators from different array objects.");
                iPos = oth.iPos;
            }

            const value &operator*() const
            {
                if( iPos < 0 )
                    throw ArrayException(
                        "Cannot dereference finished iterator.");
                return src[iPos];
            }

            long getIndex() const
            {
                return iPos;
            }
            
            operator bool() const
            {
                return iPos >= 0;
            }

            bool isValid() const
            {
                return iPos >= 0;
            }
        } const_iterator;

        iterator begin()
        {
            return iterator( *this );
        }

        const_iterator begin() const
        {
            return const_iterator( *this );
        }

        iterator end()
        {
            return iterator( *this, -1 );
        }

        const_iterator end() const
        {
            return const_iterator( *this, -1 );
        }

        MyType &insert( iterator i, const value &rVal )
        {
            if( i.iPos == -1 )
            {
                append( rVal );
                return *this;
            }

            _hardCopy();
            if( core->iSize == core->iCapacity )
            {
                core->setCapacity( core->iCapacity + inc );
            }
            core->iSize++;

            core->va.construct(
                &core->pData[core->iSize-1],
                core->pData[core->iSize-2]
                );
            for( int iPos = core->iSize-2; iPos > i.iPos; iPos-- )
            {
                core->va.destroy( &core->pData[iPos] );
                core->va.construct( &core->pData[iPos], core->pData[iPos-1] );
            }
            core->va.destroy( &core->pData[i.iPos] );
            core->va.construct( &core->pData[i.iPos], rVal );

            return *this;
        }

        /**
         * If order is important, use this.  It will delete the suggested item
         * and move the rest of the data up a spot.  This is a time O(n)
         * operation.  If the order isn't important, check swapErase
         */
        void erase( iterator i )
        {
            _hardCopy();
            core->erase( i.iPos );
        }

        void erase( const value &v )
        {
            _hardCopy();
            for( int j = 0; j < core->iSize; j++ )
            {
                if( core->pData[j] == v )
                {
                    core->erase( j );
                    return;
                }
            }
        }

        void eraseLast()
        {
            _hardCopy();
            core->erase( core->iSize-1 );
        }

        void eraseFirst()
        {
            _hardCopy();
            core->erase( 0 );
        }

        /**
         * In order to make swapErase faster, what it does is swap the given
         * item in the array with the last item, then make the array shorter
         * by one.  It changes the order of the elements in the array, so it
         * should be used carefully, but it is time O(1) instead of O(n) like
         * erase.
         */
        void swapErase( iterator i )
        {
            _hardCopy();
            core->swapErase( i.iPos );
        }

    protected:
        virtual Core *_copyCore( Core *src )
        {
            Core *pRet = _allocateCore();
            pRet->setCapacity( src->iCapacity );
            pRet->iSize = src->iSize;
            for( int j = 0; j < src->iSize; j++ )
            {   
                pRet->va.construct( &pRet->pData[j], src->pData[j] );
            }
            return pRet;
        }

    private:
    };

    class Formatter;
    Formatter &operator<<( Formatter &rOut, const char *sStr );
    Formatter &operator<<( Formatter &rOut, signed char c );
    template<typename value>
    Formatter &operator<<( Formatter &f, const Bu::Array<value> &a )
    {
        f << '[';
        for( typename Bu::Array<value>::const_iterator i = a.begin(); i; i++ )
        {
            if( i != a.begin() )
                f << ", ";
            f << *i;
        }
        f << ']';

        return f;
    }

    template<typename value, int inc, typename valuealloc>
    ArchiveBase &operator<<( ArchiveBase &ar,
            const Array<value, inc, valuealloc> &h )
    {
        ar << h.getSize();
        for( typename Array<value, inc, valuealloc>::const_iterator i =
             h.begin(); i != h.end(); i++ )
        {
            ar << (*i);
        }

        return ar;
    }

    template<typename value, int inc, typename valuealloc>
    ArchiveBase &operator>>(ArchiveBase &ar, Array<value, inc, valuealloc> &h )
    {
        h.clear();
        long nSize;
        ar >> nSize;

        h.setCapacity( nSize );
        for( long j = 0; j < nSize; j++ )
        {
            value v;
            ar >> v;
            h.append( v );
        }
        return ar;
    }

}

#endif