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package liquibase.changelog;

import liquibase.changelog.filter.*;
import liquibase.changelog.visitor.ChangeSetVisitor;
import liquibase.database.Database;
import liquibase.exception.LiquibaseException;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class ChangeLogIterator {
    private DatabaseChangeLog databaseChangeLog;
    private List changeSetFilters;

    public ChangeLogIterator(DatabaseChangeLog databaseChangeLog, ChangeSetFilter... changeSetFilters) {
        this.databaseChangeLog = databaseChangeLog;
        this.changeSetFilters = Arrays.asList(changeSetFilters);
    }

    public ChangeLogIterator(List changeSetList, DatabaseChangeLog changeLog, ChangeSetFilter... changeSetFilters) {
        final List changeSets = new ArrayList();
        for (RanChangeSet ranChangeSet : changeSetList) {
        	ChangeSet changeSet = changeLog.getChangeSet(ranChangeSet);
        	if (changeSet != null) {
        		changeSets.add(changeSet);
        	}
        }
        this.databaseChangeLog = (new DatabaseChangeLog() {
            @Override
            public List getChangeSets() {
                return changeSets;
            }
        });

        this.changeSetFilters = Arrays.asList(changeSetFilters);
    }

    public void run(ChangeSetVisitor visitor, Database database) throws LiquibaseException {
        List changeSetList = databaseChangeLog.getChangeSets();
        if (visitor.getDirection().equals(ChangeSetVisitor.Direction.REVERSE)) {
            Collections.reverse(changeSetList);
        }

        for (ChangeSet changeSet : changeSetList) {
            boolean shouldVisit = true;
            if (changeSetFilters != null) {
                for (ChangeSetFilter filter : changeSetFilters) {
                    if (!filter.accepts(changeSet)) {
                        shouldVisit = false;
                        break;
                    }
                }
            }

            if (shouldVisit) {
                visitor.visit(changeSet, databaseChangeLog, database);
            }
        }
    }
}