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package fj.data.optic;

import fj.F;
import fj.F3;
import fj.F4;
import fj.F5;
import fj.F6;
import fj.F7;
import fj.Function;
import fj.Monoid;
import fj.P;
import fj.P1;
import fj.control.Trampoline;
import fj.control.parallel.Promise;
import fj.data.Either;
import fj.data.IO;
import fj.data.IOFunctions;
import fj.data.List;
import fj.data.Option;
import fj.data.Stream;
import fj.data.Validation;
import fj.data.vector.V2;

/**
 * A {@link PTraversal} can be seen as a {@link POptional} generalised to 0 to n targets where n can be infinite.
 *
 * {@link PTraversal} stands for Polymorphic Traversal as it set and modify methods change a type `A` to `B` and `S` to `T`.
 * {@link Traversal} is a {@link PTraversal} restricted to monomoprhic updates.
 *
 * @param  the source of a {@link PTraversal}
 * @param  the modified source of a {@link PTraversal}
 * @param  the target of a {@link PTraversal}
 * @param  the modified target of a {@link PTraversal}
 */
public abstract class PTraversal {

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract  F> modifyFunctionF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract  F> modifyEitherF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyIOF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyTrampolineF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyPromiseF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyListF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyOptionF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyStreamF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyP1F(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract  F> modifyValidationF(F> f);

  /**
   * modify polymorphically the target of a {@link PTraversal} with an Applicative function
   */
  public abstract F> modifyV2F(F> f);

  /** map each target to a {@link Monoid} and combine the results */
  public abstract  F foldMap(Monoid monoid, F f);

  /** combine all targets using a target's {@link Monoid} */
  public final F fold(final Monoid m) {
    return foldMap(m, Function.identity());
  }

  /** get all the targets of a {@link PTraversal} */
  public final List getAll(final S s) {
    return foldMap(Monoid.listMonoid(), List::single).f(s);
  }

  /** find the first target of a {@link PTraversal} matching the predicate */
  public final F> find(final F p) {
    return foldMap(Monoid.optionMonoid(), a -> p.f(a) ? Option.some(a) : Option.none());
  }

  /** get the first target of a {@link PTraversal} */
  public final Option headOption(final S s) {
    return find(Function.constant(Boolean.TRUE)).f(s);
  }

  /** check if at least one target satisfies the predicate */
  public final F exist(final F p) {
    return foldMap(Monoid.disjunctionMonoid, p);
  }

  /** check if all targets satisfy the predicate */
  public final F all(final F p) {
    return foldMap(Monoid.conjunctionMonoid, p);
  }

  /** modify polymorphically the target of a {@link PTraversal} with a function */
  public final F modify(final F f) {
    return s -> this.modifyP1F(a -> P.p(f.f(a))).f(s)._1();
  }

  /** set polymorphically the target of a {@link PTraversal} with a value */
  public final F set(final B b) {
    return modify(Function.constant(b));
  }

  /** join two {@link PTraversal} with the same target */
  public final  PTraversal, Either, A, B> sum(final PTraversal other) {
    final PTraversal self = this;
    return new PTraversal, Either, A, B>() {

      @Override
      public  F, F>> modifyFunctionF(final F> f) {
        return ss1 -> ss1.either(
            s -> Function.compose(Either.left_(), self.modifyFunctionF(f).f(s)),
            s1 -> Function.compose(Either.right_(), other.modifyFunctionF(f).f(s1))
            );
      }

      @Override
      public  F, Either>> modifyEitherF(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyEitherF(f).f(s).right().map(Either.left_()),
            s1 -> other.modifyEitherF(f).f(s1).right().map(Either.right_())
            );
      }

      @Override
      public F, IO>> modifyIOF(final F> f) {
        return ss1 -> ss1.either(
            s -> IOFunctions.map(self.modifyIOF(f).f(s), Either.left_()),
            s1 -> IOFunctions.map(other.modifyIOF(f).f(s1), Either.right_())
            );
      }

      @Override
      public F, Trampoline>> modifyTrampolineF(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyTrampolineF(f).f(s).map(Either.left_()),
            s1 -> other.modifyTrampolineF(f).f(s1).map(Either.right_())
            );
      }

      @Override
      public F, Promise>> modifyPromiseF(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyPromiseF(f).f(s).fmap(Either.left_()),
            s1 -> other.modifyPromiseF(f).f(s1).fmap(Either.right_())
            );
      }

      @Override
      public F, List>> modifyListF(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyListF(f).f(s).map(Either.left_()),
            s1 -> other.modifyListF(f).f(s1).map(Either.right_())
            );
      }

      @Override
      public F, Option>> modifyOptionF(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyOptionF(f).f(s).map(Either.left_()),
            s1 -> other.modifyOptionF(f).f(s1).map(Either.right_())
            );
      }

      @Override
      public F, Stream>> modifyStreamF(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyStreamF(f).f(s).map(Either.left_()),
            s1 -> other.modifyStreamF(f).f(s1).map(Either.right_())
            );
      }

      @Override
      public F, P1>> modifyP1F(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyP1F(f).f(s).map(Either.left_()),
            s1 -> other.modifyP1F(f).f(s1).map(Either.right_())
            );
      }

      @Override
      public F, V2>> modifyV2F(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyV2F(f).f(s).map(Either.left_()),
            s1 -> other.modifyV2F(f).f(s1).map(Either.right_())
            );
      }

      @Override
      public  F, Validation>> modifyValidationF(final F> f) {
        return ss1 -> ss1.either(
            s -> self.modifyValidationF(f).f(s).map(Either.left_()),
            s1 -> other.modifyValidationF(f).f(s1).map(Either.right_())
            );
      }

      @Override
      public  F, M> foldMap(final Monoid monoid, final F f) {
        return ss1 -> ss1.either(
            self.foldMap(monoid, f),
            other.foldMap(monoid, f)
            );
      }

    };
  }

  /****************************************************************/
  /** Compose methods between a {@link PTraversal} and another Optics */
  /****************************************************************/

  /** compose a {@link PTraversal} with a {@link Fold} */
  public final  Fold composeFold(final Fold other) {
    return asFold().composeFold(other);
  }

  //
  /** compose a {@link PTraversal} with a {@link Getter} */
  public final  Fold composeFold(final Getter other) {
    return asFold().composeGetter(other);
  }

  /** compose a {@link PTraversal} with a {@link PSetter} */
  public final  PSetter composeSetter(final PSetter other) {
    return asSetter().composeSetter(other);
  }

  /** compose a {@link PTraversal} with a {@link PTraversal} */
  public final  PTraversal composeTraversal(final PTraversal other) {
    final PTraversal self = this;
    return new PTraversal() {

      @Override
      public  F> modifyFunctionF(final F> f) {
        return self.modifyFunctionF(other.modifyFunctionF(f));
      }

      @Override
      public  F> modifyEitherF(final F> f) {
        return self.modifyEitherF(other.modifyEitherF(f));
      }

      @Override
      public F> modifyIOF(final F> f) {
        return self.modifyIOF(other.modifyIOF(f));
      }

      @Override
      public F> modifyTrampolineF(final F> f) {
        return self.modifyTrampolineF(other.modifyTrampolineF(f));
      }

      @Override
      public F> modifyPromiseF(final F> f) {
        return self.modifyPromiseF(other.modifyPromiseF(f));
      }

      @Override
      public F> modifyListF(final F> f) {
        return self.modifyListF(other.modifyListF(f));
      }

      @Override
      public F> modifyOptionF(final F> f) {
        return self.modifyOptionF(other.modifyOptionF(f));
      }

      @Override
      public F> modifyStreamF(final F> f) {
        return self.modifyStreamF(other.modifyStreamF(f));
      }

      @Override
      public F> modifyP1F(final F> f) {
        return self.modifyP1F(other.modifyP1F(f));
      }

      @Override
      public  F> modifyValidationF(final F> f) {
        return self.modifyValidationF(other.modifyValidationF(f));
      }

      @Override
      public F> modifyV2F(final F> f) {
        return self.modifyV2F(other.modifyV2F(f));
      }

      @Override
      public  F foldMap(final Monoid monoid, final F f) {
        return self.foldMap(monoid, other.foldMap(monoid, f));
      }
    };
  }

  /** compose a {@link PTraversal} with a {@link POptional} */
  public final  PTraversal composeOptional(final POptional other) {
    return composeTraversal(other.asTraversal());
  }

  /** compose a {@link PTraversal} with a {@link PPrism} */
  public final  PTraversal composePrism(final PPrism other) {
    return composeTraversal(other.asTraversal());
  }

  /** compose a {@link PTraversal} with a {@link PLens} */
  public final  PTraversal composeLens(final PLens other) {
    return composeTraversal(other.asTraversal());
  }

  /** compose a {@link PTraversal} with a {@link PIso} */
  public final  PTraversal composeIso(final PIso other) {
    return composeTraversal(other.asTraversal());
  }

  /**********************************************************************/
  /** Transformation methods to view a {@link PTraversal} as another Optics */
  /**********************************************************************/

  /** view a {@link PTraversal} as a {@link Fold} */
  public final Fold asFold() {
    return new Fold() {
      @Override
      public  F foldMap(final Monoid monoid, final F f) {
        return PTraversal.this.foldMap(monoid, f);
      }
    };
  }

  /** view a {@link PTraversal} as a {@link PSetter} */
  public PSetter asSetter() {
    return PSetter.pSetter(this::modify);
  }

  public static  PTraversal pId() {
    return PIso. pId().asTraversal();
  }

  public static  PTraversal, Either, S, T> pCodiagonal() {
    return new PTraversal, Either, S, T>() {

      @Override
      public  F, F>> modifyFunctionF(final F> f) {
        return s -> s.bimap(f, f).either(
            f1 -> Function.compose(Either.left_(), f1),
            f1 -> Function.compose(Either.right_(), f1)
            );
      }

      @Override
      public  F, Either>> modifyEitherF(final F> f) {
        return s -> s.bimap(f, f).either(
            e -> e.right().map(Either.left_()),
            e -> e.right().map(Either.right_())
            );
      }

      @Override
      public F, IO>> modifyIOF(final F> f) {
        return s -> s.bimap(f, f).either(
            io -> IOFunctions.map(io, Either.left_()),
            io -> IOFunctions.map(io, Either.right_())
            );
      }

      @Override
      public F, Trampoline>> modifyTrampolineF(final F> f) {
        return s -> s.bimap(f, f).either(
            t -> t.map(Either.left_()),
            t -> t.map(Either.right_())
            );
      }

      @Override
      public F, Promise>> modifyPromiseF(final F> f) {
        return s -> s.bimap(f, f).either(
            p -> p.fmap(Either.left_()),
            p -> p.fmap(Either.right_())
            );
      }

      @Override
      public F, List>> modifyListF(final F> f) {
        return s -> s.bimap(f, f).either(
            l -> l.map(Either.left_()),
            l -> l.map(Either.right_())
            );
      }

      @Override
      public F, Option>> modifyOptionF(final F> f) {
        return s -> s.bimap(f, f).either(
            o -> o.map(Either.left_()),
            o -> o.map(Either.right_())
            );
      }

      @Override
      public F, Stream>> modifyStreamF(final F> f) {
        return s -> s.bimap(f, f).either(
            stream -> stream.map(Either.left_()),
            stream -> stream.map(Either.right_())
            );
      }

      @Override
      public F, P1>> modifyP1F(final F> f) {
        return s -> s.bimap(f, f).either(
            p1 -> p1.map(Either.left_()),
            p1 -> p1.map(Either.right_())
            );
      }

      @Override
      public F, V2>> modifyV2F(final F> f) {
        return s -> s.bimap(f, f).either(
            v2 -> v2.map(Either.left_()),
            v2 -> v2.map(Either.right_())
            );
      }

      @Override
      public  F, Validation>> modifyValidationF(final F> f) {
        return s -> s.bimap(f, f).either(
            v -> v.map(Either.left_()),
            v -> v.map(Either.right_())
            );
      }

      @Override
      public  F, M> foldMap(final Monoid monoid, final F f) {
        return s -> s.either(f, f);
      }
    };
  }

  public static  PTraversal pTraversal(final F get1, final F get2,
      final F3 set) {
    return new PTraversal() {

      @Override
      public  F> modifyFunctionF(final F> f) {
        return s -> Function.apply(Function.compose(b1 -> b2 -> set.f(b1, b2, s), f.f(get1.f(s))), f.f(get2.f(s)));
      }

      @Override
      public  F> modifyEitherF(final F> f) {
        return s -> f.f(get2.f(s)).right().apply(f.f(get1.f(s)).right().> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyIOF(final F> f) {
        return s -> IOFunctions.apply(f.f(get2.f(s)),
            IOFunctions.> map(f.f(get1.f(s)), b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyTrampolineF(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyPromiseF(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> fmap(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyListF(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyOptionF(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyStreamF(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyP1F(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public F> modifyV2F(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public  F> modifyValidationF(final F> f) {
        return s -> f.f(get2.f(s)).apply(f.f(get1.f(s)).> map(b1 -> b2 -> set.f(b1, b2, s)));
      }

      @Override
      public  F foldMap(final Monoid monoid, final F f) {
        return s -> monoid.sum(f.f(get1.f(s)), f.f(get2.f(s)));
      }
    };
  }

  public static  PTraversal pTraversal(final F get1, final F get2, final F get3,
      final F4 set) {
    return fromCurried(pTraversal(get1, get2, (b1, b2, s) -> b3 -> set.f(b1, b2, b3, s)), get3);
  }

  public static  PTraversal pTraversal(final F get1, final F get2, final F get3,
      final F get4,
      final F5 set) {
    return fromCurried(pTraversal(get1, get2, get3, (b1, b2, b3, s) -> b4 -> set.f(b1, b2, b3, b4, s)), get4);
  }

  public static  PTraversal pTraversal(final F get1, final F get2, final F get3,
      final F get4, final F get5,
      final F6 set) {
    return fromCurried(pTraversal(get1, get2, get3, get4, (b1, b2, b3, b4, s) -> b5 -> set.f(b1, b2, b3, b4, b5, s)), get5);
  }

  public static  PTraversal pTraversal(final F get1, final F get2, final F get3,
      final F get4, final F get5, final F get6,
      final F7 set) {
    return fromCurried(
        pTraversal(get1, get2, get3, get4, get5, (b1, b2, b3, b4, b5, s) -> b6 -> set.f(b1, b2, b3, b4, b5, b6, s)),
        get6);
  }

  private static  PTraversal fromCurried(final PTraversal, A, B> curriedTraversal,
      final F lastGet) {
    return new PTraversal() {

      @Override
      public  F> modifyFunctionF(final F> f) {
        return s -> Function.apply(curriedTraversal.modifyFunctionF(f).f(s), f.f(lastGet.f(s)));
      }

      @Override
      public  F> modifyEitherF(final F> f) {
        return s -> f.f(lastGet.f(s)).right().apply(curriedTraversal.modifyEitherF(f).f(s));
      }

      @Override
      public F> modifyIOF(final F> f) {
        return s -> IOFunctions.apply(f.f(lastGet.f(s)), curriedTraversal.modifyIOF(f).f(s));
      }

      @Override
      public F> modifyTrampolineF(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyTrampolineF(f).f(s));
      }

      @Override
      public F> modifyPromiseF(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyPromiseF(f).f(s));
      }

      @Override
      public F> modifyListF(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyListF(f).f(s));
      }

      @Override
      public F> modifyOptionF(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyOptionF(f).f(s));
      }

      @Override
      public F> modifyStreamF(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyStreamF(f).f(s));
      }

      @Override
      public F> modifyP1F(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyP1F(f).f(s));
      }

      @Override
      public F> modifyV2F(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyV2F(f).f(s));
      }

      @Override
      public  F> modifyValidationF(final F> f) {
        return s -> f.f(lastGet.f(s)).apply(curriedTraversal.modifyValidationF(f).f(s));
      }

      @Override
      public  F foldMap(final Monoid monoid, final F f) {
        return s -> monoid.sum(curriedTraversal.foldMap(monoid, f).f(s), f.f(lastGet.f(s)));
      }
    };
  }
}




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