package flintstones.entity.ahp;

import java.util.LinkedHashMap;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;

import flintstones.entity.problemelement.entities.ProblemElement;
import flintstones.helper.DoubleHelper;
import flintstones.helper.MatrixHelper;
import flintstones.helper.StringHelper;
import flintstones.helper.ahp.AHPHelper;
import flintstones.valuation.ahp.AHPValuation;

/**
 * The Class AHPMatrix.
 */
public class AHPMatrix {

	/** The content. */
	private LinkedHashMap<ProblemElement, LinkedHashMap<ProblemElement, AHPValuation>> content = new LinkedHashMap<>();

	/*
	 * El cuestionario:
	 * 
	 * A2 -> 8 <- A1 A2 -> 1/6 <- A3 A1 -> 1/8 <- A2 (Repe) A1 -> 1 <- A3 A3 -> 6 <-
	 * A2 (Repe) A3 -> 1 <- A1 (Repe)
	 * 
	 * Genera la matrix: A2 A1 A3 A2 1 8 1/6 A1 1/8 1 1 A3 6 1 1
	 * 
	 * Genera la matrix de índices: A2 A1 A3 A2 8 15 3 A1 1 8 8 A3 13 8 8
	 * 
	 * 
	 */

	/**
	 * Instantiates a new AHP matrix.
	 *
	 * @param domain       the domain
	 * @param alternatives the alternatives
	 */
	public AHPMatrix(ProblemElement[] alternatives) {

		for (int i = 0; i < alternatives.length; i++) {
			ProblemElement alternative = alternatives[i];
			LinkedHashMap<ProblemElement, AHPValuation> map = new LinkedHashMap<>();
			for (int j = i + 1; j < alternatives.length; j++) {
				ProblemElement b = alternatives[j];
				AHPValuation v = new AHPValuation().buildAHPValuation(alternative, b);
				map.put(b, v);
			}
			content.put(alternative, map);
		}

	}

	/**
	 * Sets the cell to a value by it index.
	 *
	 * @param a     the first PE
	 * @param b     the second PE
	 * @param index the index of the value in the domain
	 */
	public void set(ProblemElement a, ProblemElement b, int index) {

		if (a.equals(b))
			return;

		LinkedHashMap<ProblemElement, AHPValuation> map = content.get(a);
		AHPValuation val = map.get(b);

		if (val == null) {
			map = content.get(b);
			val = map.get(a);
			int reverseIndex = AHPHelper.getInverseIndex(index);
			val.setIndex(reverseIndex);
		} else {
			val.setIndex(index);
		}

	}

	// API for debbugging only
	public void setValue(ProblemElement a, ProblemElement b, String valueLabel) {
		String[] labels = AHPHelper.getLabels();
		int index = StringHelper.IndexOf(labels, valueLabel);
		set(a, b, index);
	}

	/**
	 * Gets the index.
	 *
	 * @param a the first PE
	 * @param b the second PE
	 * @return the index of the value in the domain
	 */
	public int getIndex(ProblemElement a, ProblemElement b) {

		if (a.equals(b))
			return (int) AHPHelper.getMidPoint();

		LinkedHashMap<ProblemElement, AHPValuation> map = content.get(a);

		AHPValuation val = map.get(b);

		int index;

		if (val == null) {
			map = content.get(b);
			val = map.get(a);
			index = AHPHelper.getInverseIndex(val.getIndex());
		} else {
			index = val.getIndex();
		}

		return index;

	}

	/**
	 * Gets the label.
	 *
	 * @param a the first PE
	 * @param b the second PE
	 * @return the human readable label
	 */
	public String getLabel(ProblemElement a, ProblemElement b) {
		int index = this.getIndex(a, b);
		return AHPHelper.getLabels()[index];
	}

	/**
	 * Gets the value.
	 *
	 * @param a the first PE
	 * @param b the second PE
	 * @return the value
	 */
	public Double getValue(ProblemElement a, ProblemElement b) {
		int index = this.getIndex(a, b);
		Double val = DoubleHelper.ParseFraction(AHPHelper.getLabels()[index]);
		return val;
	}

	/**
	 * Gets the values.
	 *
	 * @return the values
	 */
	public double[][] getValues() {

		int size = content.size();
		double[][] result = new double[size][size];

		ProblemElement[] arr = content.keySet().stream().toArray(ProblemElement[]::new);

		for (int i = 0; i < size; i++)
			for (int j = 0; j < size; j++)
				result[i][j] = this.getValue(arr[i], arr[j]);

		return result;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {

		boolean toStringIndex = true;
		String[] indexValueMapping = AHPHelper.getLabels();
		StringBuilder sb = new StringBuilder();
		String[] headers = content.keySet().stream().map(k -> k.getName()).toArray(String[]::new);

		String[][] m = new String[headers.length][headers.length];

		ProblemElement[] pes = content.keySet().toArray(new ProblemElement[0]);

		int i = 0;
		for (ProblemElement pe1 : pes) {
			int j = 0;

			for (ProblemElement pe2 : pes) {
				m[i][j] = toStringIndex ? indexValueMapping[getIndex(pe1, pe2)] : this.getIndex(pe1, pe2) + "";
				j++;

			}

			i++;
		}

//		for(Entry<ProblemElement, LinkedHashMap<ProblemElement, AHPValuation>> entry1 : content.entrySet()) {
//			int j = 0;
//			for( Entry<ProblemElement, AHPValuation> entry2 : entry1.getValue().entrySet()) {
//				m[i][j] = entry2.getValue().getIndex()+"";
//				j++;
//			}
//			i++;
//		}

		String[][] m2 = MatrixHelper.addHeaders(m, headers, headers);
		sb.append(StringHelper.PrintTable(m2));
		sb.append("\n");
		sb.append("RAW: \n");
		sb.append(content.toString());
		sb.append("\n");
		return sb.toString();

	}

	/**
	 * Gets the cols.
	 *
	 * @return the cols
	 */
	public ProblemElement[] getCols() {
		return this.content.keySet().toArray(new ProblemElement[0]);
	}

	/**
	 * Gets the rows.
	 *
	 * @return the rows
	 */
	public ProblemElement[] getRows() {
		return this.content.keySet().toArray(new ProblemElement[0]);
	}

	/**
	 * Write.
	 *
	 * @param writer the writer
	 * @throws XMLStreamException the XML stream exception
	 */
	public void write(XMLStreamWriter writer) throws XMLStreamException {
		ProblemElement[] arr = content.keySet().toArray(new ProblemElement[0]);

		for (int i = 0; i < arr.length; i++) {
			ProblemElement pe1 = arr[i];
			for (int j = i; j < arr.length; j++) {
				ProblemElement pe2 = arr[j];
				if (!pe1.equals(pe2)) {
					writer.writeStartElement("AHPValuation");
					content.get(pe1).get(pe2).write(writer);
					writer.writeEndElement();
				}

			}
		}

	}

}