package com.framsticks.params;

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

import com.framsticks.util.FramsticksException;


import static com.framsticks.util.lang.Containers.filterInstanceof;

/**
 * @author Piotr Sniegowski
 */
public abstract class Util {

	public static String readSourceToString(SourceInterface source) {
		StringBuilder result = new StringBuilder();
		String line;
		while ((line = source.readLine()) != null) {
			result.append(line).append(" ");
		}
		source.close();
		return result.toString();
	}

	public static <T> List<T> stripAccess(List<Access> accesses, Class<T> type) {
		List<T> result = new ArrayList<T>();
		for (Access a : accesses) {
			Object object = a.getSelected();
			if (!type.isInstance(object)) {
				throw new FramsticksException().msg("extracted object is of invalid type").arg("object", object).arg("desired", type).arg("actual", object.getClass()).arg("framsclass", a.getFramsClass());
			}
			result.add(type.cast(object));
		}
		return result;
	}

	public static int takeAllNonNullValues(Access to, Access from) {
		int copied = 0;
		for (ValueParam f : filterInstanceof(from.getParams(), ValueParam.class)) {
			Object v = from.get(f, Object.class);
			if (v == null) {
				continue;
			}
			// if (to.get(f, Object.class) != null) {
			//	continue;
			// }
			to.set(f, v);
			++copied;
		}
		return copied;
	}

	public static int copyExistingParamsTypeSafe(Access to, Access from) {
		int copied = 0;
		for (ValueParam f : filterInstanceof(from.getParams(), ValueParam.class)) {
			Param t = from.getParam(f.getId());
			if (!(t instanceof ValueParam)) {
				continue;
			}
			if (to.getClass() != f.getClass()) {
				continue;
			}
			to.set((ValueParam) t, from.get(f, Object.class));
			++copied;
		}
		return copied;
	}

	public static <T> T selectObjectForAccess(Access access, Object object, Class<T> type) {
		if (object == null) {
			return null;
		}
		if (!type.isInstance(object)) {
			throw new FramsticksException().msg("trying to select object of wrong type").arg("object", object).arg("type", object.getClass()).arg("in", access);
		}
		return type.cast(object);
	}

	public static int getNumberOfCompositeParamChild(Access access, Object child) {
		int count = access.getCompositeParamCount();
		for (int i = 0; i < count; ++i) {
			if (access.get(i, Object.class) == child) {
				return i;
			}
		}
		return -1;
	}

}