// program implement the working of files simple stock
// management

#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>
#include <stdlib.h>
#include <stdio.h>

class stock{
    int code;
    char name[30];
    float cost;
    char flag;
public:
    void getStock();
    void putStock();
    char getFlag();
    void putFlag(char);
    int getCode();
};

int stock :: getCode(){
    return code;
}

char stock :: getFlag(){
    return flag;
}
void stock::putFlag(char a){
    flag=a;
}
void stock::getStock(){
    cout << "\nEnter Stock Code: "; cin >> code;
    cout << "\nEnter Stock Name: "; cin >> name;
    cout << "\nEnter Stock Cost: "; cin >> cost;
}

void stock :: putStock(){
    cout << endl << setw(10) << code << setw(10)
         << name << setw(10) << cost << setw(10) 
         << getFlag();
}


void main(){
    stock stk,stk1;
    int choice,loc,count,temp,cnt;
    int SIZE = sizeof(stk);
    int tcount =0,find;
    char filename[] ="d:\\stock2.dat";  
    int sel;

    fstream iofile;
    ofstream tempfile;

    iofile.open(filename, ios::in | ios::out);
    iofile.seekg(0, ios::beg);

    cout << "\nThe Current Stock's are :\n";
    cout << setw(10) << "Code" << setw(10) << "Name" 
         << setw(10) << "Cost" << setw(10) << "Status";


    while(iofile.read((char *) &stk, sizeof(stk))){
        stk.putStock();
        tcount ++;
        }
    iofile.close();

    while(1){
        cout << "\nEnter \n1.Add\n2.Display\n3.Display(*)\n4.Modify With Sl No\n5.Modify with Item Number\n\
6.Mark For Delete\n7.Delete Permenantly\n8.Unmark\n9.Exit\n";

        cin >> choice;

    switch(choice){
        case 1:
            int rec;
            cnt=0;

            // code for adding new record
            iofile.open(filename, ios::in | ios::app);
            iofile.seekg(0);
            iofile.clear();
            stk1.getStock();
            stk1.getCode();
            stk1.putFlag('&');
            loc=0;
            count=0;
            while(iofile.read((char *) &stk, sizeof(stk))){
                if( stk.getCode()==stk1.getCode()){
                cout<<"\nRecord already exist....";
                cnt++;
                }
                }
                iofile.close();
                if(cnt>=1){
                    iofile.close();
                    break;
                }
                else{
                    iofile.open(filename,ios::app|ios::in);
                    iofile.write((char *) &stk1,sizeof(stk1));
                    tcount++;
                    iofile.close();
                    break;
                    }       
        case 3:
                //displaying with (*)
                cout << "\nThe Mark Stock's are :\n";
                cout << setw(10) << "Code" << setw(10) << "Name" 
                     << setw(10) << "Cost" << setw(10)<<"status";
                cout<<endl;

                iofile.open(filename, ios::in|ios::out);
                while(iofile.read((char *) &stk, sizeof(stk)))
                    if(stk.getFlag()=='*')
                    stk.putStock();
                    iofile.close();
                break;
        case 4:
            //modify with serial number...
                iofile.open(filename, ios::in | ios::out);
                int recno;
                loc = 0;
                cout << "\nEnter the record Number to be modified: ";
                cin >> recno;
                if(recno > tcount){
                cout << "\nYou have only " << tcount 
                    << " Number of records\nPlease Enter with in range";
                break;
                }
                loc = (recno -1) * SIZE;
                iofile.seekp(loc);
                cout << "\nEnter new Values for Stock";
                stk.getStock();

                iofile.write((char *) &stk, sizeof(stk));
                iofile.close();
                break;
        case 2://display all item...

                    cout <<"\n The current stocks are:\n";
                    cout<<endl<<setw(10)<<"Code"<<setw(10)<<"Name"<<setw(10)<<"Cost"<<setw(10)<<"Status"<<endl;
                    iofile.open(filename,ios::in|ios::out);
                    while(iofile.read((char *)&stk,sizeof(stk)))
                    stk.putStock();
                    iofile.close();
                    break;
        case 5:
                // Modify item details with Item Number 
                cout << "\nEnter the code ";
                cin >> temp;
                iofile.open(filename, ios::in | ios::out);

                iofile.seekg(0);
                loc = 0;
                count=0;

                while(iofile.read((char *) & stk, SIZE)){
                    if(temp != stk.getCode())
                        count++;
                    else{
                        loc = (count) * SIZE;
                        iofile.seekp(loc);
                        cout << "\nEnter new Values for Stock";
                        stk.getStock();

                        iofile.write((char *) &stk, sizeof(stk));

                        iofile.close();
                        break;
                        }
                    }
                iofile.close();
                cout<< "\n Item Not Found";
                break;
        case 6:
                // code for marking a record for delete
                int recno1;
                count =0,cnt=0,loc=0;
                cout<<"\n1.To mark particular file: press 1\n2.To mark all records: press 2\n";
                cin>>sel;
                if(sel==1){
                cout << "\nEnter the record number of Deletion(*): ";
                cin >> recno1;

                iofile.open(filename, ios::in | ios::out);
                iofile.seekg(0);
                while(iofile.read((char *) & stk, SIZE)){
                    if(recno1 == stk.getCode()){
                        loc=(count)*SIZE;
                        iofile.seekp(loc);
                        stk.putFlag('*');
                        iofile.write((char *)&stk,SIZE);
                        cout << "\nRecord found with id " << recno1;
                        iofile.close();
                        cnt++;
                        break;
                        } 
                        count++;
                        }

                    if(count>=1)
                        break;
                    else{
                        cout << "\nRecord Not found for Deletion";
                        iofile.close();
                        break;
                        }
                    }
                else if(sel==2){
                        iofile.open(filename, ios::in | ios::out);
                        iofile.seekg(0);
                        while(iofile.read((char *) & stk, SIZE)){
                            loc=(count)*SIZE;
                            iofile.seekp(loc);
                            stk.putFlag('*');
                            iofile.write((char *)&stk,SIZE);
                            count++;
                        }
                        iofile.close();
                        break;
                        }           
        case 7:     
                    iofile.open(filename, ios::in | ios::out);
                    iofile.seekg(0);

                    tempfile.open("D:\\delet.dat",ios::out);

                    while(iofile.read((char *)&stk,SIZE)){
                        if(stk.getFlag()!='*'){
                            tempfile.write((char *)&stk,SIZE);
                        }
                    }
                    iofile.close();
                    tempfile.close();
                    remove(filename);
                    rename("D:\\delet.dat",filename);
                    break;
        case 8: 
                    int recno2;
                    count=0;
                    cnt=0;
                    loc=0;  
                    cout<<"\na). To unmark particular file: press 1\nb). To unmark all marked files: press 2";
                    cin>>sel;
                    if(sel==1){
                        iofile.open(filename, ios::in | ios::out);
                        iofile.seekg(0);
                        cout<<"\nEnter the record number to unmark: ";
                        cin>>recno2;
                        while(iofile.read((char *) & stk, SIZE)){
                        if(recno2==stk.getCode()){
                        loc=(count)*SIZE;
                        iofile.seekp(loc);
                        stk.putFlag('&');
                        iofile.write((char *)&stk,SIZE);
                        cout << "\nRecord found with id " << recno1;
                        iofile.close();
                        cnt++;
                        break;
                        } 
                        count++;
                        }

                    if(count>=1)
                        break;
                    else{
                        cout << "\nRecord Not found for Deletion";
                        iofile.close();
                        break;
                        }   
                    }
                    else if(sel==2){
                        iofile.open(filename, ios::in | ios::out);
                        iofile.seekg(0);
                        while(iofile.read((char *) & stk, SIZE)){
                        loc=(count)*SIZE;
                        iofile.seekp(loc);
                        stk.putFlag('&');
                        iofile.write((char *)&stk,SIZE);
                        count++;
                        }
                        iofile.close();
                        break;
                        } 
                    else{
                        cout << "\nInvlaid selection...";
                        break;
                        }   
            case 9:
                    exit(0);
            default:
                cout <<"\nPlease Enter valid option ";
                }

        }
}

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