CN-SMO 2012 Problem 7

In $\triangle ABC$ , point $D$ lies on side $AC$ such that $\angle ABD=\angle C$ . Point $E$ lies on side $AB$ such that $BE=DE$ . $M$ is the midpoint of segment $CD$ . Point $H$ is the foot of the perpendicular from $A$ to $DE$ . Given $AH=2-\sqrt{3}$ and $AB=1$ , find the size of $\angle AME$ .