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use std::ops::Deref;

use soft_ascii_string::{ SoftAsciiStr, SoftAsciiString};

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

#[cfg(feature="serde")]
use serde::{Serialize, Deserialize};

#[derive(Debug, Clone, Hash, Eq, PartialEq)]
#[cfg_attr(feature="serde", derive(Serialize, Deserialize))]
pub enum SimpleItem {
    /// specifies that the Item is valid Ascii, nothing more
    Ascii( InnerAscii ),
    /// specifies that the Item is valid Utf8, nothing more
    Utf8( InnerUtf8 )
}

impl SimpleItem {

    pub fn as_str( &self ) -> &str {
        use self::SimpleItem::*;
        match *self {
            Ascii( ref value ) => value.as_str(),
            Utf8( ref value ) => value.as_str()
        }
    }

    pub fn is_ascii( &self ) -> bool {
        use self::SimpleItem::*;
        match *self {
            Ascii( .. ) => true,
            Utf8( .. ) => false
        }
    }

    pub fn from_utf8_input( s: Input ) -> Self {
        SimpleItem::Utf8( s.0 )
    }

    pub fn from_utf8( s: String ) -> Self {
        SimpleItem::Utf8( InnerUtf8::Owned( s ) )
    }


}

impl Deref for SimpleItem {
    type Target = str;

    fn deref( &self ) -> &str {
        use self::SimpleItem::*;
        match *self {
            Ascii( ref astr ) => astr.as_str(),
            Utf8( ref utf8 ) => &**utf8
        }
    }
}


impl Into<String> for SimpleItem {
    fn into(self) -> String {
        use self::SimpleItem::*;
        match self {
            Ascii( aitem ) => {
                let astring: SoftAsciiString = aitem.into();
                astring.into()
            },
            Utf8( string ) => string.into()
        }
    }
}

impl<'a> From<&'a str> for SimpleItem {
    fn from( string: &'a str ) -> Self {
        Self::from( String::from( string ) )
    }
}

impl From<String> for SimpleItem {
    fn from( string: String ) -> Self {
        match SoftAsciiString::from_string( string ) {
            Ok( astring ) => SimpleItem::Ascii( InnerAscii::Owned( astring ) ),
            Err( err ) => SimpleItem::Utf8( InnerUtf8::Owned( err.into_source() ) )
        }
    }
}

impl From<SoftAsciiString> for SimpleItem {
    fn from( astring: SoftAsciiString ) -> Self {
        SimpleItem::Ascii( InnerAscii::Owned( astring ) )
    }
}

impl From<Input> for SimpleItem {
    fn from(input: Input) -> Self {
        match input {
            Input( InnerUtf8::Owned( string ) ) => match SoftAsciiString::from_string( string ) {
                Ok( ascii ) => SimpleItem::Ascii( InnerAscii::Owned( ascii ) ),
                Err( err ) => SimpleItem::Utf8( InnerUtf8::Owned( err.into_source() ) )
            },
            Input( InnerUtf8::Shared( shared ) ) => {
                if shared.is_ascii() {
                    let a_shared = shared.map(|s| SoftAsciiStr::from_unchecked(s));
                    SimpleItem::Ascii(InnerAscii::Shared(a_shared))
                } else {
                    SimpleItem::Utf8(InnerUtf8::Shared(shared))
                }
            }
        }
    }
}