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use std::result::{ Result as StdResult };
use std::fmt::{self, Display};

use soft_ascii_string::SoftAsciiString;

use ::HeaderTryFrom;
use ::error::ComponentCreationError;

use super::inner_item::{ InnerUtf8, InnerAscii };

/// a Input is similar to Item a container data container used in different
/// context's with different restrictions, but different to an Item it
/// might contain characters which require encoding (e.g. encoded words)
/// to represent them
#[derive(Debug, Clone, Hash, Eq, PartialEq)]
pub struct Input( pub InnerUtf8 );


impl Input {

    pub fn into_shared( self ) -> Self {
        Input( self.0.into_shared() )
    }


    pub fn into_ascii_item( self ) -> StdResult<InnerAscii, Input> {
        match self {
            Input( InnerUtf8::Owned( string ) ) => {
                match SoftAsciiString::from_string(string) {
                    Ok(asciied) => Ok(InnerAscii::Owned(asciied)),
                    Err(err) => Err(Input(InnerUtf8::Owned(err.into_source())))
                }
            }
            Input( InnerUtf8::Shared( shared ) ) => {
                if shared.is_ascii() {
                    Ok(InnerAscii::Owned(SoftAsciiString::from_unchecked(&*shared)))
                } else {
                    Err(Input(InnerUtf8::Shared(shared)))
                }
            }
        }
    }

    pub fn into_ascii_item_unchecked( self ) -> InnerAscii {
        match self {
            Input( InnerUtf8::Owned( string ) ) =>
                InnerAscii::Owned( SoftAsciiString::from_unchecked( string ) ),
            Input( InnerUtf8::Shared( shared ) ) =>
                InnerAscii::Owned(
                    SoftAsciiString::from_unchecked(&*shared) )
        }
    }

    pub fn into_utf8_item( self ) -> InnerUtf8 {
        self.0
    }
}

impl<'a> From<&'a str> for Input {
    fn from( s: &'a str ) -> Self {
        Input( InnerUtf8::Owned( s.into() ) )
    }
}

impl From<String> for Input {
    fn from( s: String ) -> Self {
        Input( InnerUtf8::Owned( s ) )
    }
}

impl<'a> HeaderTryFrom<&'a str> for Input
{
    fn try_from(val: &'a str) -> Result<Self, ComponentCreationError> {
        Ok(val.into())
    }
}
impl HeaderTryFrom<String> for Input
{
    fn try_from(val: String) -> Result<Self, ComponentCreationError> {
        Ok(val.into())
    }
}

impl Into<String> for Input {
    fn into(self) -> String {
        self.0.into()
    }
}

impl Display for Input {
    fn fmt(&self, fter: &mut fmt::Formatter) -> fmt::Result {
        fter.write_str(self.as_str())
    }
}

deref0!( +mut Input => InnerUtf8 );



#[cfg(test)]
mod test {
    use std::sync::Arc;
    use owning_ref::OwningRef;

    use super::*;

    #[test]
    fn input_eq() {
        let a = Input( InnerUtf8::Owned( "same".into() ) );
        let b = Input( InnerUtf8::Shared(
            OwningRef::new(
                Arc::new( String::from( "same" ) ) )
                .map(|v| &**v)
        ) );
        assert_eq!( a, b );
    }

    #[test]
    fn input_neq() {
        let a = Input( InnerUtf8::Owned( "not same".into() ) );
        let b = Input( InnerUtf8::Shared(
            OwningRef::new(
                Arc::new( String::from( "not at all same" ) ) )
                .map(|v| &**v)
        ) );
        assert_ne!( a, b );
    }



}