//!
//! Work with bools.
//!

///
/// Get bool like value.
///

#[ derive( Debug, PartialEq ) ]
pub enum BoolLike
{
  /// Variant for true-like values.
  True,
  /// Variant for false-like values.
  False,
}

impl Default for BoolLike
{
  fn default() -> Self { BoolLike::False }
}

impl From< BoolLike > for bool
{
  fn from( bool_like : BoolLike ) -> Self
  {
    match bool_like
    {
      BoolLike::True => true,
      BoolLike::False => false,
    }
  }
}

///
/// Method to get bool like value from current type.
///

pub trait ToBoolLike
{
  /// Get bool like value.
  fn to_bool_like( &self ) -> BoolLike;
}

//

impl ToBoolLike for &str
{
  fn to_bool_like( &self ) -> BoolLike
  {
    let bool_like = match self.parse::< bool >()
    {
      Ok( x ) => if x { BoolLike::True } else { BoolLike::False },
      Err( _ ) =>
      {
        match self.parse::< i32 >()
        {
          Ok( y ) => if y == 1 { BoolLike::True } else { BoolLike::False },
          Err(_err) => BoolLike::False,
        }
      },
    };

    bool_like
  }
}

//

impl ToBoolLike for String
{
  fn to_bool_like( &self ) -> BoolLike
  {
    let bool_like = match self.parse::< bool >()
    {
      Ok( x ) => if x { BoolLike::True } else { BoolLike::False },
      Err( _ ) =>
      {
        match self.parse::< i32 >()
        {
          Ok( y ) => if y == 1 { BoolLike::True } else { BoolLike::False },
          Err( _err ) => BoolLike::False,
        }
      },
    };

    bool_like
  }
}