package net.sourceforge.fenixedu.domain.curricularRules;

import net.sourceforge.fenixedu.domain.ExecutionSemester;
import net.sourceforge.fenixedu.domain.ExecutionYear;
import net.sourceforge.fenixedu.domain.curricularRules.executors.RuleResult;
import net.sourceforge.fenixedu.domain.curricularRules.executors.ruleExecutors.CurricularRuleExecutorFactory;
import net.sourceforge.fenixedu.domain.curricularRules.executors.verifyExecutors.VerifyRuleLevel;
import net.sourceforge.fenixedu.domain.degreeStructure.Context;
import net.sourceforge.fenixedu.domain.degreeStructure.CourseGroup;
import net.sourceforge.fenixedu.domain.degreeStructure.DegreeModule;
import net.sourceforge.fenixedu.domain.enrolment.EnrolmentContext;
import net.sourceforge.fenixedu.domain.enrolment.IDegreeModuleToEvaluate;

import org.joda.time.YearMonthDay;

abstract public class CurricularRuleNotPersistent implements ICurricularRule {

    @Override
    public boolean equals(Object obj) {
        if (!getClass().equals(obj.getClass())) {
            return false;
        }

        CurricularRuleNotPersistent curricularRuleNotPersistent = null;
        if (obj instanceof CurricularRuleNotPersistent) {
            curricularRuleNotPersistent = (CurricularRuleNotPersistent) obj;
        } else {
            return false;
        }

        return this.getDegreeModuleToApplyRule() == curricularRuleNotPersistent.getDegreeModuleToApplyRule()
                && this.getCurricularRuleType() == curricularRuleNotPersistent.getCurricularRuleType();
    }

    @Override
    public int hashCode() {
        final StringBuilder builder = new StringBuilder();
        if (getDegreeModuleToApplyRule() != null) {
            builder.append(String.valueOf(getDegreeModuleToApplyRule().hashCode()));
            builder.append('@');
        }
        builder.append(String.valueOf(getCurricularRuleType().hashCode()));
        return builder.toString().hashCode();
    }

    @Override
    public boolean appliesToContext(Context context) {
        return context == null || this.appliesToCourseGroup(context.getParentCourseGroup());
    }

    @Override
    public boolean appliesToCourseGroup(CourseGroup courseGroup) {
        return (this.getContextCourseGroup() == null || this.getContextCourseGroup() == courseGroup);
    }

    @Override
    public boolean hasContextCourseGroup() {
        return getContextCourseGroup() != null;
    }

    @Override
    public boolean hasCurricularRuleType(CurricularRuleType ruleType) {
        return getCurricularRuleType() == ruleType;
    }

    @Override
    public boolean isCompositeRule() {
        return getCurricularRuleType() == null;
    }

    @Override
    public boolean isValid(ExecutionSemester executionSemester) {
        return (getBegin().isBeforeOrEquals(executionSemester) && (getEnd() == null || getEnd()
                .isAfterOrEquals(executionSemester)));
    }

    @Override
    public boolean isValid(ExecutionYear executionYear) {
        for (ExecutionSemester executionSemester : executionYear.getExecutionPeriods()) {
            if (isValid(executionSemester)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public boolean isVisible() {
        return false;
    }

    @Override
    public boolean isActive() {
        return getEnd() == null || getEnd().containsDay(new YearMonthDay());
    }

    @Override
    public RuleResult evaluate(final IDegreeModuleToEvaluate sourceDegreeModuleToEvaluate, EnrolmentContext enrolmentContext) {
        return CurricularRuleExecutorFactory.findExecutor(this).execute(this, sourceDegreeModuleToEvaluate, enrolmentContext);
    }

    @Override
    public RuleResult verify(final VerifyRuleLevel level, final EnrolmentContext enrolmentContext,
            final DegreeModule degreeModuleToVerify, final CourseGroup parentCourseGroup) {
        return createVerifyRuleExecutor().verify(this, level, enrolmentContext, degreeModuleToVerify, parentCourseGroup);
    }

}