package fj.data;

import static fj.data.Validation.parseInt;
import static fj.data.Validation.condition;
import fj.P3;
import fj.P;
import fj.Bottom;
import fj.pre.Semigroup;
import fj.pre.Show;
import static fj.pre.Show.validationShow;
import static fj.pre.Show.nonEmptyListShow;
import static fj.pre.Show.stringShow;
import static fj.pre.Show.p3Show;
import static fj.pre.Show.intShow;
import static fj.pre.Show.booleanShow;

import static java.lang.Character.isUpperCase;

public final class ValidationTest {
  static final Show, P3>> show =
          validationShow(nonEmptyListShow(stringShow), p3Show(intShow, stringShow, booleanShow));

  public static void main(final String[] args) {
    // age must parse as an integer, otherwise, return the exception's toString
    final Validation age = parseInt(args[0]).f().map(Bottom.eToString());

    // name must start with a capital letter
    final Validation name = condition(!args[1].isEmpty() && isUpperCase(args[1].charAt(0)),
            "First character of the name must be upper-case", args[1]);

    // must be "male" or "female" or error message
    final Validation female = args[2].equals("female") ?
            Validation.success(true) :
            args[2].equals("male") ?
                    Validation.success(false) :
                    Validation.fail("gender must be male or female");

    // accumulate validation
    final Validation, P3> acc =
            age.nel().accumulate(Semigroup.nonEmptyListSemigroup(), name.nel(), female.nel(), P.p3());

    // well?
    show.println(acc);
  }
}

/*
> java ValidationTest 42 Bob male
Success((42,Bob,false))

> java ValidationTest 27 Mary female
Success((27,Mary,true))

> java ValidationTest x Bob male
Fail([java.lang.NumberFormatException: For input string: "x"])

> java ValidationTest 23 mary female
Fail([First character of the name must be upper-case])

> java ValidationTest 46 Bob both
Fail([gender must be male or female])

> java ValidationTest old mary female
Fail([java.lang.NumberFormatException: For input string: "old",First character of the name must be upper-case])

> java ValidationTest old Bob neither
Fail([java.lang.NumberFormatException: For input string: "old",gender must be male or female])

> java ValidationTest 42 mary neither
Fail([First character of the name must be upper-case,gender must be male or female])

> java ValidationTest young fred none
Fail([java.lang.NumberFormatException: For input string: "young",First character of the name must be upper-case,gender must be male or female])
*/