package net.sourceforge.fenixedu.domain;

import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;

import net.sourceforge.fenixedu.domain.exceptions.DomainException;
import net.sourceforge.fenixedu.util.EvaluationType;

import org.apache.commons.lang.StringUtils;

import pt.utl.ist.fenix.tools.util.i18n.Language;

public enum GradeScale {

    TYPE20(true) {
        @Override
        protected boolean checkFinal(final Grade grade) {
            final String value = grade.getValue();
            if (value.equals(NA) || value.equals(RE)) {
                return true;
            }

            try {
                final int intValue = Integer.parseInt(value);
                return intValue >= 10 && intValue <= 20;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        protected boolean checkNotFinal(final Grade grade) {
            final String value = grade.getValue();
            if (value.equals(NA) || value.equals(RE)) {
                return true;
            }

            try {
                final double doubleValue = Double.parseDouble(value);
                return doubleValue >= 0 && doubleValue <= 20;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        protected String qualify(final Grade grade) {
            if (grade.getGradeScale() != this) {
                return StringUtils.EMPTY;
            }

            try {
                final int intValue = Integer.parseInt(grade.getValue());
                final ResourceBundle applicationResources =
                        ResourceBundle.getBundle("resources.ApplicationResources", Language.getLocale());

                if (18 <= intValue && intValue <= 20) {
                    return applicationResources.getString("label.grade.a");
                } else if (16 <= intValue && intValue <= 17) {
                    return applicationResources.getString("label.grade.b");
                } else if (14 <= intValue && intValue <= 15) {
                    return applicationResources.getString("label.grade.c");
                } else if (10 <= intValue && intValue <= 13) {
                    return applicationResources.getString("label.grade.d");
                } else {
                    throw new DomainException("GradeScale.unable.to.qualify.given.grade");
                }
            } catch (NumberFormatException e) {
                throw new DomainException("GradeScale.unable.to.qualify.given.grade");
            }
        }

        @Override
        protected boolean isNotEvaluated(final Grade grade) {
            final String value = grade.getValue();
            return grade.isEmpty() || value.equals(GradeScale.NA);
        }

        @Override
        protected boolean isNotApproved(final Grade grade) {
            final String value = grade.getValue();
            if (value.equals(GradeScale.RE) || isNotEvaluated(grade)) {
                return true;
            }

            try {
                return Integer.parseInt(value) < 10;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        protected boolean isApproved(final Grade grade) {
            final String value = grade.getValue();
            if (value.equals(GradeScale.AP)) {
                return true;
            }

            try {
                final int intValue = Integer.parseInt(value);
                return 10 <= intValue && intValue <= 20;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        public boolean belongsTo(final String value) {
            if (value.equals(NA) || value.equals(RE)) {
                return true;
            }

            try {
                final double doubleValue = Double.parseDouble(value);
                return doubleValue >= 0 && doubleValue <= 20;
            } catch (NumberFormatException e) {
                return false;
            }
        }

    },

    TYPE5(true) {
        @Override
        protected boolean checkFinal(final Grade grade) {
            final String value = grade.getValue();
            if (value.equals(NA) || value.equals(RE)) {
                return true;
            }

            try {
                final int intValue = Integer.parseInt(value);
                return intValue >= 3 && intValue <= 5;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        protected boolean checkNotFinal(final Grade grade) {
            final String value = grade.getValue();
            if (value.equals(NA) || value.equals(RE)) {
                return true;
            }

            try {
                final double doubleValue = Double.parseDouble(value);
                return doubleValue >= 0 && doubleValue <= 20;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        protected String qualify(final Grade grade) {
            if (grade.getGradeScale() != this) {
                return StringUtils.EMPTY;
            }

            try {
                final int intValue = Integer.parseInt(grade.getValue());
                final ResourceBundle applicationResources =
                        ResourceBundle.getBundle("resources.ApplicationResources", Language.getLocale());

                if (intValue == 5) {
                    return applicationResources.getString("label.grade.a");
                } else if (intValue == 4) {
                    return applicationResources.getString("label.grade.b");
                } else if (intValue == 3) {
                    return applicationResources.getString("label.grade.c");
                } else {
                    throw new DomainException("GradeScale.unable.to.qualify.given.grade");
                }
            } catch (NumberFormatException e) {
                throw new DomainException("GradeScale.unable.to.qualify.given.grade");
            }
        }

        @Override
        protected boolean isNotEvaluated(final Grade grade) {
            if (grade.isEmpty()) {
                return true;
            }

            return grade.getValue().equals(GradeScale.NA);
        }

        @Override
        protected boolean isNotApproved(final Grade grade) {
            final String value = grade.getValue();
            if (value.equals(GradeScale.RE) || isNotEvaluated(grade)) {
                return true;
            }

            try {
                return Integer.parseInt(value) < 3;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        protected boolean isApproved(final Grade grade) {
            try {
                final int intValue = Integer.parseInt(grade.getValue());
                return 3 <= intValue && intValue <= 5;
            } catch (NumberFormatException e) {
                return false;
            }
        }

        @Override
        public boolean belongsTo(final String value) {
            if (value.equals(NA) || value.equals(RE)) {
                return true;
            }

            try {
                final double doubleValue = Double.parseDouble(value);
                return doubleValue >= 0 && doubleValue <= 5;
            } catch (NumberFormatException e) {
                return false;
            }
        }

    },

    TYPEAP(true) {
        @Override
        protected boolean checkFinal(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(NA) || value.equals(RE) || value.equals(AP);
        }

        @Override
        protected boolean checkNotFinal(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(NA) || value.equals(RE) || value.equals(AP);
        }

        @Override
        protected String qualify(final Grade grade) {
            if (grade.getGradeScale() != this) {
                return StringUtils.EMPTY;
            }

            final ResourceBundle applicationResources =
                    ResourceBundle.getBundle("resources.ApplicationResources", Language.getLocale());

            final String value = grade.getValue();
            if (value.equals(AP)) {
                return applicationResources.getString("msg.approved");
            } else if (value.equals(RE)) {
                return applicationResources.getString("msg.notApproved");
            } else if (value.equals(NA)) {
                return applicationResources.getString("msg.notEvaluated");
            } else {
                throw new DomainException("GradeScale.unable.to.qualify.given.grade");
            }
        }

        @Override
        protected boolean isNotEvaluated(final Grade grade) {
            final String value = grade.getValue();
            return grade.isEmpty() || value.equals(GradeScale.NA);
        }

        @Override
        protected boolean isNotApproved(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(GradeScale.RE) || isNotEvaluated(grade);
        }

        @Override
        protected boolean isApproved(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(GradeScale.AP);
        }

        @Override
        public boolean belongsTo(final String value) {
            return value.equals(NA) || value.equals(RE) || value.equals(AP);
        }

    },

    TYPEAPT(false) {
        @Override
        protected boolean checkFinal(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(NA) || value.equals(RE) || value.equals(APT);
        }

        @Override
        protected boolean checkNotFinal(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(NA) || value.equals(RE) || value.equals(APT);
        }

        @Override
        protected String qualify(final Grade grade) {
            if (grade.getGradeScale() != this) {
                return StringUtils.EMPTY;
            }

            final ResourceBundle applicationResources =
                    ResourceBundle.getBundle("resources.ApplicationResources", Language.getLocale());

            final String value = grade.getValue();
            if (value.equals(APT)) {
                return applicationResources.getString("msg.apt");
            } else if (value.equals(RE)) {
                return applicationResources.getString("msg.notApproved");
            } else if (value.equals(NA)) {
                return applicationResources.getString("msg.notEvaluated");
            } else {
                throw new DomainException("GradeScale.unable.to.qualify.given.grade");
            }
        }

        @Override
        protected boolean isNotEvaluated(final Grade grade) {
            final String value = grade.getValue();
            return grade.isEmpty() || value.equals(GradeScale.NA);
        }

        @Override
        protected boolean isNotApproved(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(GradeScale.RE) || isNotEvaluated(grade);
        }

        @Override
        protected boolean isApproved(final Grade grade) {
            final String value = grade.getValue();
            return value.equals(GradeScale.APT);
        }

        @Override
        public boolean belongsTo(final String value) {
            return value.equals(NA) || value.equals(RE) || value.equals(APT);
        }

    },

    TYPEECTS(false) {

        @Override
        public boolean belongsTo(String value) {
            return value.equals("A") || value.equals("B") || value.equals("C") || value.equals("D") || value.equals("E")
                    || value.equals("F") || value.equals(NA);
        }

        @Override
        protected boolean checkFinal(Grade grade) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        protected boolean checkNotFinal(Grade grade) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        protected boolean isApproved(Grade grade) {
            return !(isNotEvaluated(grade) || isNotApproved(grade));
        }

        @Override
        protected boolean isNotApproved(Grade grade) {
            return grade.getValue().equals("F");
        }

        @Override
        protected boolean isNotEvaluated(Grade grade) {
            return grade.getValue().equals(NA);
        }

        @Override
        protected String qualify(Grade grade) {
            // TODO Auto-generated method stub
            return null;
        }

    };

    private boolean isPublic;

    static final public String NA = "NA";

    static final public String RE = "RE";

    static final public String AP = "AP";

    static final public String APT = "APT";

    private GradeScale(final boolean isPublic) {
        setPublic(isPublic);
    }

    public String getName() {
        return name();
    }

    public boolean isValid(final String value, final EvaluationType evaluationType) {
        try {
            final Grade grade = Grade.createGrade(value, this);
            if (grade.isEmpty()) {
                return false;
            }
            if (EvaluationType.FINAL_TYPE.equals(evaluationType)) {
                return checkFinal(grade);
            } else {
                return checkNotFinal(grade);
            }
        } catch (DomainException de) {
            return false;
        }
    }

    abstract protected boolean checkFinal(final Grade grade);

    abstract protected boolean checkNotFinal(final Grade grade);

    abstract protected String qualify(final Grade grade);

    abstract protected boolean isNotEvaluated(final Grade grade);

    abstract protected boolean isNotApproved(final Grade grade);

    abstract protected boolean isApproved(final Grade grade);

    abstract public boolean belongsTo(final String value);

    final protected boolean belongsTo(final Grade grade) {
        return belongsTo(grade.getValue());
    }

    final public String getQualifiedName(final String value) {
        final Grade grade = Grade.createGrade(value, this);

        if (isApproved(grade)) {
            return qualify(grade);
        } else {
            throw new DomainException("GradeScale.unable.to.qualify.given.grade");
        }
    }

    public boolean isPublic() {
        return isPublic;
    }

    public void setPublic(boolean isPublic) {
        this.isPublic = isPublic;
    }

    static public List<GradeScale> getPublicGradeScales() {
        List<GradeScale> publicGradeScales = new ArrayList<GradeScale>();
        for (GradeScale gradeScale : values()) {
            if (gradeScale.isPublic) {
                publicGradeScales.add(gradeScale);
            }
        }
        return publicGradeScales;
    }

    public String getDescription() {
        return ResourceBundle.getBundle("resources.EnumerationResources", Language.getLocale()).getString(name());
    }

    public String getPossibleValueDescription(boolean isFinal) {
        if (isFinal) {
            return ResourceBundle.getBundle("resources.EnumerationResources", Language.getLocale()).getString("TYPE.final");
        }

        return ResourceBundle.getBundle("resources.EnumerationResources", Language.getLocale())
                .getString(name() + ".description");
    }

}