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package net.sourceforge.plantuml.project.lang;

import net.sourceforge.plantuml.project.Failable;
import net.sourceforge.plantuml.project.GanttConstraintMode;
import net.sourceforge.plantuml.project.GanttDiagram;
import net.sourceforge.plantuml.project.core.Moment;
import net.sourceforge.plantuml.project.core.TaskAttribute;
import net.sourceforge.plantuml.project.core.TaskInstant;
import net.sourceforge.plantuml.regex.RegexResult;

abstract class AbstractComplementTaskInstant implements Something {

	final public Failable getComplementTaskInstant(GanttDiagram system, RegexResult arg, String suffix) {
		final String code = arg.get("COMPLEMENT_CODE_OTHER" + suffix, 0);
		final String startOrEnd = arg.get("COMPLEMENT_START_OR_END" + suffix, 0);

		final Moment task = system.getExistingMoment(code);
		if (task == null)
			return Failable.error("No such task " + code);

		TaskInstant result = new TaskInstant(task, TaskAttribute.fromString(startOrEnd));
		final String nb1 = arg.get("COMPLEMENT_NB1" + suffix, 0);
		if (nb1 != null) {
			final int factor1 = arg.get("COMPLEMENT_DAY_OR_WEEK1" + suffix, 0).startsWith("w") ? system.daysInWeek()
					: 1;
			final int days1 = Integer.parseInt(nb1) * factor1;

			final String nb2 = arg.get("COMPLEMENT_NB2" + suffix, 0);
			int days2 = 0;
			if (nb2 != null) {
				final int factor2 = arg.get("COMPLEMENT_DAY_OR_WEEK2" + suffix, 0).startsWith("w") ? system.daysInWeek()
						: 1;
				days2 = Integer.parseInt(nb2) * factor2;
			}

			int delta = days1 + days2;
			if ("before".equalsIgnoreCase(arg.get("COMPLEMENT_BEFORE_OR_AFTER" + suffix, 0)))
				delta = -delta;

			final boolean working = arg.get("COMPLEMENT_WORKING1" + suffix, 0) != null
					|| arg.get("COMPLEMENT_WORKING2" + suffix, 0) != null;

			final GanttConstraintMode mode = working ? GanttConstraintMode.DO_NOT_COUNT_CLOSE_DAY
					: GanttConstraintMode.IGNORE_CALENDAR;

			result = result.withDelta(delta, mode, system.getDefaultPlan());
		}
		return Failable.ok(result);
	}

}