package app;

import java.util.*;
import java.io.*;

public class dataStruct
{
        int count = 0;

        private int ClassLength;
        private int StuLength;
        private int Techlength;

        LabTech head;
        LabTech tail;
        LabTech current;
        LabTech trail;

        StudentWorker stuHead;
        StudentWorker stuTail;
        StudentWorker stuCurrent;
        StudentWorker stuTrail;

        Class chead;
        Class ctail;
        Class cCurrent;
        Class cTrail;

        boolean found;

        int num = 0;
        int data = 0;
        String Data = " ";

        Scanner in = new Scanner(System.in);

        public dataStruct ()
        {
            StuLength = 0;
            ClassLength = 0;
            Techlength = 0;

            head = null;
            tail = null;
            current = null;
            trail = null;

            stuHead = null;
            stuTail = null;
            stuCurrent = null;
            stuTrail = null;

            chead = null;
            ctail = null;
            cCurrent = null;
            cTrail = null;

            found = false;

        }

        public void initializeTechList()
        {//intializes list
            head = null;
            Techlength = 0;
        }

        public void initializeClassList()
        {//intializes list
            chead = null;
            ClassLength = 0;
        }

        public void initializeStudentList()
        {//intializes list
            stuHead = null;
            StuLength = 0;
        }


        public boolean isClassEmpty()
        {//checks to see if the list is empty
            return (chead == null);
        }

        public boolean isTechEmpty()
        {//checks to see if the list is empty
            return (head == null);
        }

        public boolean isStuEmpty()
        {//checks to see if the list is empty
            return (head == null);
        }


        public void addClass(String n, String c, String lect, String d, String t, String l)
        {//adds node
            try
            {//attepts to find and open the file
                PrintWriter out = new PrintWriter("Final_project.dat");
                String start = "startclass";
                String end = "endclass";
            Class cl = new Class();
            //out.println stores data unto the file

                    cl.link = chead;
                    out.println(start);
                    cl.setName(n);
                    out.println(n);
                    cl.code = c;
                    out.println(c);
                    cl.setLecturer(lect);
                    out.println(lect);
                    cl.setday(d);
                    out.println(d);
                    cl.setTime(t);
                    out.println(t);
                    cl.setLab(l);
                    out.println(l);
                    out.println(end);

                    if (ctail == null)
                    {
                        ctail = cl;
                        ClassLength++;
                    }
                    out.close();
                }

                catch (FileNotFoundException e)
                {
                    //if the file cannot be opened the error is handled...
                    System.err.println("file not found...");
                }


        }

        public void addLabTech(String lf, String ll,int lId, String llab, String lday, String lt,String lq)
        {//adds node

            try
            {//attepts to find and open the file
                PrintWriter out = new PrintWriter("Final_project.dat");
                String start = "startlabtech";
                String end = "endlabtech";
            LabTech tech = new LabTech();
            //out.println stores data unto the file
                tech.link = head;
                out.println(start);
                tech.setf(lf);
                out.println(lf);
                tech.setl(ll);
                out.println(ll);
                tech.setId(lId);
                out.println(lId);
                tech.setlab(llab);
                out.println(llab);
                tech.setday(lday);
                out.println(lday);
                tech.settime(lt);
                out.println(lt);
                tech.setqual(lq);
                out.println(lq);
                out.println(end);

            if (tail == null)
            {
                tail = tech;
                Techlength++;
            }
            out.close();
        }
            catch (FileNotFoundException e)
            {
                //if the file cannot be opened the error is handled...
                System.err.println("file not found...");
            }

        }

        public void addStudent(String sfn, String sln, int sId, String sl, String sd, String st, String m)
        {//adds node
            try
            {//attepts to find and open the file
            PrintWriter out = new PrintWriter("Final_project.dat");
            String start = "startstudent";
            String end = "endstudent";
                StudentWorker stu = new StudentWorker();
                //out.println stores data unto the file
                    stu.link = stuHead;
                    out.println(start);
                    stu.setFname(sfn);
                    out.println(sfn);
                    stu.setLname(sln);
                    out.println(sln);
                    stu.stuID = sId;
                    out.println(sId);
                    stu.setLab(sl);
                    out.println(sl);
                    stu.setday(sd);
                    out.println(sd);
                    stu.setTime(st);
                    out.println(st);
                    stu.setmajor(m);
                    out.println(m);
                    out.println(end);
                if (stuTail == null)
                {
                    stuTail = stu;
                    StuLength++;
                }
            out.close();
            }
            catch (FileNotFoundException e)
            {
                //if the file cannot be opened the error is handled...
                System.err.println("file not found...");
            }

        }


        public void deleteCLass(String Data)
        {//deletes Class from list
            Class cCurrent, cTrail;
            if (isClassEmpty())
            {//checks to see if list is empty
                System.err.println("CANNOT DELETE FROM AN EMPTY LIST!!!!");
            }
            else
            {
                if (chead.code.equalsIgnoreCase(Data))
                {//if the list isnt empty it checks to see if the node to be deleted is the head of the list
                    chead = chead.link;
                    System.out.println("\nSuccesfully deleted...");
                    ClassLength--;

                    if (chead == null)
                    {
                        ctail = null;
                        System.out.println("\nSuccesfully deleted...");
                        ClassLength--;
                    }
                    else
                    {//if the node is somewhere in the list it will find it and delete it
                        cTrail = chead;
                        cCurrent = chead.link;
                        while (cCurrent != null && !found)
                        {
                            if (cCurrent.code.equalsIgnoreCase(Data))
                            {
                                found = true;
                                System.out.println("\nSuccesfully deleted...");
                                ClassLength--;
                            }
                            else
                            {
                                cTrail = cCurrent;
                                cCurrent = cCurrent.link;
                            }
                            if (found)
                            {
                                cTrail.link =cCurrent.link;
                                System.out.println("\nSuccesfully deleted...");
                                ClassLength--;
                                if (ctail == cCurrent)
                                {
                                    ctail = cTrail;
                                }
                                else
                                {
                                    System.err.println("\nSorry...the Item to be deleted isnt in the list....");
                                }
                            }
                        }
                    }
                }
            }
        }

        public void deleteLab(int data)
        {//deletes Lab tech from list
            LabTech current, trail;
        if (isTechEmpty())
            {//if list isnt empty it will delete
                System.err.println("CANNOT DELETE FROM AN EMPTY LIST!!!!");
            }
            else
            {
                if (head.staffID == data)
                {//if the node to be deleted is the head of the list it will assign the head to the next in the list
                    head = head.link;
                    System.out.println("\nSuccesfully deleted...");
                    Techlength--;

                    if (isTechEmpty())
                    {
                        tail = null;
                        System.out.println("\nSuccesfully deleted...");
                        Techlength--;
                    }
                    else
                    {//if the node is somewhere in the list it will find it and delete it
                        trail = head;
                        current = head.link;
                        while (current != null && !found)
                        {
                            if (current.staffID == data)
                            {
                                found = true;
                                System.out.println("\nSuccesfully deleted...");
                                Techlength--;
                            }
                            else
                            {
                                trail = current;
                                current = current.link;
                            }
                            if (found)
                            {
                                trail.link =current.link;
                                System.out.println("\nSuccesfully deleted...");
                                Techlength--;
                                if (tail == current)
                                {
                                    tail = trail;
                                }
                            }
                            else
                            {
                                System.err.println("\nSorry...The item to be deleted isnt in the list....");
                            }

                        }
                    }
                }
            }
        }

        public void deleteStudent(int data)
        {//deletes student from lits
            StudentWorker stuCurrent, stuTrail;

            if (isStuEmpty())
            {//if list isnt empty it will delete
                System.err.println("CANNOT DELETE FROM AN EMPTY LIST!!!!");
            }
            else
            {
                if (stuHead.stuID == data)
                {//if the node to be deleted is the head of the list it will assign the head to the next in the list
                    stuHead = stuHead.link;
                    System.out.println("\nSuccesfully deleted...");
                    StuLength--;

                    if (isStuEmpty())
                    {
                        stuTail = null;
                        System.out.println("\nSuccesfully deleted...");
                        StuLength--;
                    }
                    else
                    {//if the node is somewhere in the list it will find it and delete it
                        stuTrail = stuHead;
                        stuCurrent = stuHead.link;
                        while (stuCurrent != null && !found)
                        {
                            if (stuHead.stuID == data)
                            {
                                found = true;
                                System.out.println("\nSuccesfully deleted...");
                                StuLength--;
                            }
                            else
                            {
                                stuTrail = stuCurrent;
                                stuCurrent = stuCurrent.link;
                            }
                            if (found)
                            {
                                stuTrail.link =stuCurrent.link;
                                System.out.println("\nSuccesfully deleted...");
                                StuLength--;
                                if (stuTail == stuCurrent)
                                {
                                    stuTail = stuTrail;
                                }
                                else
                                {
                                    System.err.println("\nSorry...the item to be deleted isnt in the list....");
                                }
                            }

                        }
                    }
                }
            }
        }

        public boolean searchClassList(String Data)
        {//searches Class by class Code
            try
            {
                Scanner inFile = new Scanner( new FileReader("Final_project.dat") );
                String info = " ";
                if (isClassEmpty())
                {
                    System.err.println("\nThis list is empty...");
                }
                else
                {
                    info = inFile.nextLine();
                    if (inFile.hasNext())
                    {
                        if (info == Data)
                        {
                            found = true;
                            System.out.println("\nClass Code Found : " + Data);
                        }
                        cCurrent = chead;
                        while (cCurrent != null && !found)
                        {
                            if (cCurrent.code.equalsIgnoreCase(Data))
                            {
                                found = true;
                            }
                            else
                            {
                                cCurrent = cCurrent.link;
                                if (found == true)
                                {
                                    System.out.println("\nClass Code Found : " + Data);
                                }
                                else
                                {
                                    System.err.println("\n" + Data + " not found...");
                                }
                            }
                        }
                    }
                    else
                    {
                        System.err.println("\nEmpty file....");
                    }
                }
                       inFile.close();
                       return found;
        }
        catch (FileNotFoundException e)
        {
            System.err.println("\nFile not found...");
        }
        return found;
        }

        public boolean searchStudentList(int data)
        {//searches student by ID number
            try
            {
                Scanner inFile = new Scanner (new FileReader("Final_project.dat"));
                int ids = 0;
                if (isStuEmpty())
                {
                    System.err.println("\nThis list is empty...");
                }
                else
                {
                    ids = inFile.nextInt();
                    if (inFile.hasNext())
                    {
                        if (ids == data)
                        {
                            found = true;
                            System.out.println("\nStudent ID Found : " + data);
                        }
                        stuCurrent = stuHead;
                        while (stuCurrent != null && !found)
                        {
                            if (stuCurrent.stuID == data)
                            {
                                found = true;
                            }
                            else
                            {
                                stuCurrent = stuCurrent.link;
                                if (found == true)
                                {
                                    System.out.println("\nStudent ID Found : " + data);
                                }
                                else
                                {
                                    System.err.println("\n" + data + " not found...");
                                }
                            }
                        }
                    }
                }
                inFile.close();
            }
            catch (FileNotFoundException e)
            {
                System.err.println("\nFile not found....");
            }


            return found;
        }

        public boolean searchTechList(int data)
        {//searches Lab tech by Staff ID number
            try
            {
                Scanner inFile = new Scanner (new FileReader("Final_project.dat"));
                int ids = 0;
                if (isTechEmpty())
                {
                    System.err.println("\nThis list is empty...");
                }
                else
                {
                    ids = inFile.nextInt();
                    if (inFile.hasNext())
                    {
                        if (ids == data)
                        {
                            found = true;
                            System.out.println("\nStudent ID Found : " + data);
                        }
                        current = head;
                        while (current != null && !found)
                        {
                            if (current.staffID == data)
                            {
                                found = true;
                            }
                            else
                            {
                                current = current.link;
                                if (found == true)
                                {
                                    System.out.println("\nLab Tech ID Found : " + data);
                                }
                                else
                                {
                                    System.err.println("\n" + data + " not found...");
                                }
                            }
                        }
                    }
                }
                inFile.close();
            }
            catch (FileNotFoundException e)
            {
                System.err.println("\nfile not found......");
            }
            return found;
        }

        public void print()
        {
            System.out.println("\nClass List....");
            if (isClassEmpty())
            {
            System.err.println("\n*---CLASS LIST EMPTY---*");
            }
            else
            {
                cCurrent = chead;
                while (cCurrent!= null)
                {
                    System.out.println("\n Class Code: " + cCurrent.code
                    + "\nClass name: " + cCurrent.getName()
                    + "\nClass Lecturer: " +cCurrent.getLecturer()
                    + "\nClass Day(s): " +cCurrent.getDay()
                    + "\nClass Time: " +cCurrent.getTime()
                    +"\nClass Lab: " +cCurrent.getLab());
                    cCurrent =cCurrent.link;
                }
                System.out.println("\nCLass List Length = " + ClassLength);
            }


            System.out.println("\n\nStudent List...");
            if (isStuEmpty())
            {
            System.err.println("\n*---STUDENT LIST EMPTY---*");
            }
            else
            {
                stuCurrent = stuHead;
                while (stuCurrent != null)
                {

                    System.out.println("\nStudent Name :" + stuCurrent.getFname() + " " + stuCurrent.getLname()
                    + "\nStudent ID: " + stuCurrent.getID()
                    + "\nStudent Major: " +stuCurrent.getM()
                    + "\nAssingned Lab: " +stuCurrent.getLab()
                    + "\nDay(s): " +stuCurrent.getday()
                    + "\nTime: " +stuCurrent.getTime());
                    stuCurrent = stuCurrent.link;
                }
                System.out.println("\nStudent Worker List Length = " + StuLength);
            }


            System.out.println("\n\nLab Techn List....");
            if (isTechEmpty())
            {
            System.err.println("\n*---LAB TECH LIST EMPTY---*");
            }
            else
            {
                current = head;
                while (current != null)
                {
                    System.out.println("\nTechnician Name :" + current.getfname() + " " + current.getlname()
                    + "\nStaff ID: " + current.getId()
                    + "\nTechnician's Qualifications: " +current.getQualif()
                    + "\nAssingned Lab: " +current.getlab()
                    + "\nDay(s): " +current.getday()
                    + "\nTime: " +current.gettime());
                    current = current.link;
                }
                System.out.println("\n Lab Tech List Length = " + Techlength);
            }
        }

        public void labSchedules()
        {
            try
            {
                Scanner infile = new Scanner ( new FileReader("Final_project.dat"));
                String Data = " ";
                int info = 0;
                if (!infile.hasNext())
                {
                    System.err.println("\nEmpty file...");
                }
                else// reads file and inputs data into linked list
                {
                    Data = infile.nextLine(); // reads data from the file
                    do //starts do while loop in file to read the entire file
                    {
                        if (Data == "startclass")
                        { // if any data in the file contains startclass the program enters a do - while loop

                            while (infile.hasNextLine() && Data != "endclass")// starts while loop to read the file until "endclass" is found
                            {
                                if (Data == cCurrent.getCode())
                                {
                                        cCurrent.setCode(Data);
                                }
                                if (Data == cCurrent.getName())
                                {
                                    cCurrent.setName(Data);
                                }
                                if (Data == cCurrent.getLecturer())
                                {
                                    cCurrent.setLecturer(Data);
                                }
                                if (Data == cCurrent.getTime())
                                {
                                    cCurrent.setTime(Data);
                                }
                                if (Data == cCurrent.getDay())
                                {
                                    cCurrent.setday(Data);
                                }
                                if (Data == cCurrent.getLab())
                                {
                                    cCurrent.setLab(Data);
                                }
                            }
                        }
                        else if (Data == "startstudent")
                        {
                            while (infile.hasNextLine() && Data != "endstudent")// starts while loop to read the file until "endstudent" is found
                            {
                                info = infile.nextInt();//reads intergers from the file
                                if (info == stuCurrent.getID())
                                {
                                        stuCurrent.setID(info);
                                }
                                if (Data == stuCurrent.getFname())
                                {
                                    stuCurrent.setFname(Data);
                                }
                                if (Data == stuCurrent.getLname())
                                {
                                    stuCurrent.setLname(Data);
                                }
                                if (Data == stuCurrent.getM())
                                {
                                    stuCurrent.setmajor(Data);
                                }
                                if (Data == stuCurrent.getTime())
                                {
                                    stuCurrent.setTime(Data);
                                }
                                if (Data == stuCurrent.getday())
                                {
                                    stuCurrent.setday(Data);
                                }
                                if (Data == stuCurrent.getLab())
                                {
                                    stuCurrent.setLab(Data);
                                }
                            }
                        }
                        else if (Data == "startlabtech")
                        {
                            while (infile.hasNextLine() && Data != "endlabtech")// starts while loop to read the file until "endlabtech" is found
                            {
                                info = infile.nextInt();//reads intergers from the file
                                if (info == current.getId())
                                {
                                        current.setId(info);
                                }
                                if (Data == current.getfname())
                                {
                                    current.setf(Data);
                                }
                                if (Data == current.getlname())
                                {
                                    current.setl(Data);
                                }
                                if (Data == current.getQualif())
                                {
                                    current.setqual(Data);
                                }
                                if (Data == current.gettime())
                                {
                                    current.settime(Data);
                                }
                                if (Data == current.getday())
                                {
                                    current.setday(Data);
                                }
                                if (Data == current.getlab())
                                {
                                    current.setlab(Data);
                                }
                            }
                        }
                    }
                    while (infile.hasNext());


                    if (isClassEmpty() || isStuEmpty() || isTechEmpty())
                    {
                        System.err.println("\nERROR!! "
                        + "\nIn order to view the Lab Schedule for Computer Room (CR) You MUST add ALL 3 fields as an entry:"
                        +"\n\t1.A Lab Tech \n\t2. Student worker    \n\t3. Class");
                    }
                    else
                    {
                        System.out.println("\n------------------------------COMPUTER ROOM (CR)-------------------------------------");
                        while (cCurrent.getLab() == "CR" || current.getlab() == "CR" || stuCurrent.getLab() == "CR")
                        {
                            if (cCurrent.getDay() == "Monday & Wendnesday" || current.getday() == "Monday" || stuCurrent.getday() == "Monday" || current.getday() == "Everyday" || stuCurrent.getday() == "Everday")
                            {
                                System.out.println("\nMonday Class: " + cCurrent.code + "-" + cCurrent.getLecturer()
                                + "\n\tLab Tech: " + current.getfname() + " " +current.getlname()
                                + "\n\t\tStudent Worker: " +stuCurrent. getFname()+ " " +stuCurrent.getLname());
                                System.out.println("\n\t\t\t\t Time: " + cCurrent.getTime());
                            }
                            else if (cCurrent.getDay() == "Tuesday & Thursday" || current.getday() == "Tuesday" || stuCurrent.getday() == "Tuesday" || current.getday() == "Everyday" || stuCurrent.getday() == "Everday")
                            {
                                    System.out.println("\nTuesday Class: " + cCurrent.code + "-" + cCurrent.getLecturer()
                                    + "\n\tLab Tech: " + current.getfname() + " " +current.getlname()
                                    + "\n\t\tStudent Worker: " +stuCurrent. getFname()+ " " +stuCurrent.getLname());
                                    System.out.println("\n\t\t\t\t Time: " + cCurrent.getTime());
                            }
                            else if (cCurrent.getDay() == "Monday & Wednesday" || current.getday() == "Wednesday" || stuCurrent.getday() == "Wednesday" || current.getday() == "Everyday" || stuCurrent.getday() == "Everday")
                            {
                                System.out.println("\nWednesday Class: " + cCurrent.code + "-" + cCurrent.getLecturer()
                                + "\n\tLab Tech: " + current.getfname() + " " +current.getlname()
                                + "\n\t\tStudent Worker: " +stuCurrent. getFname()+ " " +stuCurrent.getLname());
                                System.out.println("\n\t\t\t\t Time: " + cCurrent.getTime());
                            }
                            else if (cCurrent.getDay() == "Tuesday & Thursday" || current.getday() == "Thursday" || stuCurrent.getday() == "Thursday" || current.getday() == "Everyday" || stuCurrent.getday() == "Everday")
                            {
                                System.out.println("\nThursday Class: " + cCurrent.code + "-" + cCurrent.getLecturer()
                                + "\n\tLab Tech: " + current.getfname() + " " +current.getlname()
                                + "\n\t\tStudent Worker: " +stuCurrent. getFname()+ " " +stuCurrent.getLname());
                                System.out.println("\n\t\t\t\t Time: " + cCurrent.getTime());
                            }
                            else
                            {
                                System.out.println("\n-------------------------------------LABS CLOSED-----------------------------------------");
                            }
                        }
                    }
                }
                infile.close();
            }
            catch (FileNotFoundException e)
            {
                System.err.println("\nUnable to open file");
            }


        }

        public void updateClass(String Data, String n, String c, String lect, String d, String t, String l)
        {//update lab adds data then deletes the selected node from the list.
            Class cCurrent, ctrail;

            if (isClassEmpty())
            {//checks to see if the list is empty
                System.err.println("\nCannot Update an Empty list....");
            }
            else
            {
                if (chead.code.equalsIgnoreCase(Data))
                {//if the list isnt empty, it chects to see if the entered data is equal to head
                    addClass(n, c, lect, d, t, l);
                    chead = chead.link;
                    System.out.println("Succesfully Updated...");
                }
                else
                {// if the data is in the list but isnt the 1st node in the list, it goes through the list to look fot the data
                    addClass(n, c, lect, d, t, l);
                    ctrail = chead;
                    cCurrent = chead.link;
                    while (cCurrent != null && !found)
                    {
                        if (cCurrent.code.equalsIgnoreCase(Data))
                        {
                            found = true;
                            System.out.println("\nSuccesFully Updated...");
                            ClassLength--;
                        }
                        else
                        {
                            ctrail = cCurrent;
                            cCurrent = cCurrent.link;
                        }

                        if (found)
                        {
                            ctrail.link = cCurrent.link;
                            ClassLength--;

                            if (ctail == cCurrent)
                            {
                                ctail = ctrail;
                            }
                        }
                    }
                }

            }
        }

        public void updateStudent(int data, String sfn, String sln, int sId, String sl, String sd, String st, String m)
        {//update lab adds data then deletes the selected node from the list.
            StudentWorker stuCurrent, stuTrail;

            if (isStuEmpty())
            {//checks to see if the list is empty
                System.err.println("\nCannot Update an Empty list....");
            }
            else
            {
                if (stuHead.stuID == data)
                {//if the list isnt empty, it chects to see if the entered data is equal to head
                    addStudent(sfn, sln, sId, sl, sd, st, m);
                    stuHead = stuHead.link;
                    System.out.println("Succesfully Updated...");
                }
                else
                {// if the data is in the list but isnt the 1st node in the list, it goes through the list to look fot the data
                    addStudent(sfn, sln, sId, sl, sd, st, m);
                    stuTrail = stuHead;
                    stuCurrent = stuHead.link;
                    while (cCurrent != null && !found)
                    {
                        if (stuCurrent.stuID == data)
                        {
                            found = true;
                            System.out.println("\nSuccesFully Updated...");
                            StuLength--;
                        }
                        else
                        {
                            stuTrail = stuCurrent;
                            stuCurrent = stuCurrent.link;
                        }

                        if (found)
                        {
                            stuTrail.link = stuCurrent.link;
                            StuLength--;

                            if (stuTail == stuCurrent)
                            {
                                stuTail = stuTrail;
                            }
                        }
                    }
                }

            }

        }

        public void updateLab(int data, String lf, String ll,int lId, String llab, String lday, String lt,String lq)
        {//update lab adds data then deletes the selected node from the list.
            LabTech current, trail;
            if (isTechEmpty())
            {//checks to see if the list is empty
                System.err.println("\nCannot Update an Empty list....");
            }
            else
            {
                if (head.staffID == data)
                {//if the list isnt empty, it chects to see if the entered data is equal to head
                    addLabTech(lf, ll, lId, llab, lday, lt, lq);
                    head = head.link;
                    System.out.println("Succesfully Updated...");
                    Techlength--;
                }
                else
                {// if the data is in the list but isnt the 1st node in the list, it goes through the list to look fot the data
                    addLabTech(lf, ll, lId, llab, lday, lt, lq);
                    trail = head;
                    current = head.link;
                    while (current != null && !found)
                    {
                        if (current.staffID == data)
                        {
                            found = true;
                            System.out.println("\nSuccesFully Updated...");
                            Techlength--;
                        }
                        else
                        {
                            trail = current;
                            current = current.link;
                        }

                        if (found)
                        {
                            trail.link = current.link;
                            Techlength--;

                            if (tail == current)
                            {
                                tail = trail;
                            }
                        }
                    }
                }

            }
        }
}