package kernel;

  import kernel.exception.CreateCycleException;

  import java.io.Serializable;

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

  import java.util.Objects;

  public class Cell implements Serializable {

  	
  	private static final long serialVersionUID = 1L;

  	private String column;
  	private int line;
  	private double value;
  	private Formula formula;
  	private List<Cell> usedIn = new ArrayList<>();
  	

  	public Cell(String column, int line, double value) {

  		this.column = column;
  		this.line = line;
  		this.setValue(value);
  	}
  	
  	public Cell(String column, int line, Formula formula)

  			throws CreateCycleException {

  		this.column = column;
  		this.line = line;
  		this.setFormula(formula);
  	}
  	
  	public double getValue() {
  		return this.value;
  	}
  	
  	public Formula getFormula() {
  		return this.formula;
  	}
  	
  	public String getDevelopedFormula() {
  		return this.containFormula() ? this.formula.getDevelopedFormula() : this.getId();
  	}
  	
  	public String getId() {
  		return this.column + this.line;
  	}
  	
  	public List<Cell> getUsedIn() {
  		return this.usedIn;
  	}
  	
  	public String toString() {
  		return this.containFormula() ? this.formula.toString() : this.getId();
  	}
  	
  	public void updateValue() {
  		if (this.containFormula())
  			this.value = this.formula.eval();
  	}
  	

  	public void updateUsedIn() {
  		if (this.containFormula()) {
  			for (Cell cell : this.formula.getUtilisedCells())
  				cell.getUsedIn().remove(this);
  		}
  	}
  	

  	public boolean containFormula() {
  		return this.formula != null;
  	}
  	
  	public void setFormula(Formula formula) throws CreateCycleException {
  		if (formula.createCycle(this))

  			throw new CreateCycleException("L'assignation de la formule " + formula.toString() + " créée un cycle.");

  		
  		this.formula = formula;
  		for (Cell cell : this.formula.getUtilisedCells())
  			cell.usedIn.add(this);
  		this.updateValue();
  		this.spreadValue();
  	}
  	
  	public void setValue(double value) {
  		this.value = value;
  		this.formula = null;
  		this.spreadValue();
  	}
  	
  	private void spreadValue() {
  		for (Cell cell : this.usedIn) {
  			cell.updateValue();
  			cell.spreadValue();
  		}
  	}
  	

  	@Override
  	public boolean equals(Object o) {
  		if (this == o)
  			return true;
  		if (!(o instanceof Cell))
  			return false;
  		
  		Cell cell = (Cell) o;
  		
  		return line == cell.line && column.equals(cell.column);
  	}

  	@Override
  	public int hashCode() {
  		return Objects.hash(column, line);
  	}

  }