package scalaz
package syntax

/** Wraps a value `self` and provides methods related to `Bind` */
trait BindOps[F[_],A] extends Ops[F[A]] {
  implicit def F: Bind[F]
  ////
  import Liskov.<~<

  def flatMap[B](f: A => F[B]) = F.bind(self)(f)

  def >>=[B](f: A => F[B]) = F.bind(self)(f)

  def ∗[B](f: A => F[B]) = F.bind(self)(f)

  def join[B](implicit ev: A <~< F[B]): F[B] = F.bind(self)(ev(_))

  def μ[B](implicit ev: A <~< F[B]): F[B] = F.bind(self)(ev(_))

  def >>[B](b: => F[B]): F[B] = F.bind(self)(_ => b)

  def ifM[B](ifTrue: => F[B], ifFalse: => F[B])(implicit ev: A <~< Boolean): F[B] = {
    val value: F[Boolean] = Liskov.co[F, A, Boolean](ev)(self)
    F.ifM(value, ifTrue, ifFalse)
  }

  ////
}

trait ToBindOps0 {
  implicit def ToBindOpsUnapply[FA](v: FA)(implicit F0: Unapply[Bind, FA]) =
    new BindOps[F0.M,F0.A] { def self = F0(v); implicit def F: Bind[F0.M] = F0.TC }

}

trait ToBindOps extends ToBindOps0 with ToApplyOps {
  implicit def ToBindOps[F[_],A](v: F[A])(implicit F0: Bind[F]) =
    new BindOps[F,A] { def self = v; implicit def F: Bind[F] = F0 }

  ////

  ////
}

trait BindSyntax[F[_]] extends ApplySyntax[F] {
  implicit def ToBindOps[A](v: F[A]): BindOps[F, A] = new BindOps[F,A] { def self = v; implicit def F: Bind[F] = BindSyntax.this.F }

  def F: Bind[F]
  ////

  ////
}