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use std::any::Any;

#[cfg(feature = "bytes")]
use bytes::Bytes;
#[cfg(feature = "bytes")]
use chars::Chars;

use super::*;

/// Type implemented by all protobuf elementary types
/// (ints, floats, bool, string, bytes, enums, messages).
pub trait ProtobufValue: Any + 'static {
    /// As ref
    fn as_ref(&self) -> ProtobufValueRef;

    /// Convert to `Any`
    fn as_any(&self) -> &Any {
        unimplemented!()
    }

    /// Is value non-zero?
    fn is_non_zero(&self) -> bool {
        self.as_ref().is_non_zero()
    }

    /// Return `ProtobufValueRef` if self is `Copy`.
    ///
    /// # Panics
    ///
    /// if `Self` is not `Copy`.
    fn as_ref_copy(&self) -> ProtobufValueRef<'static>
//where Self : Copy // TODO
    {
        match self.as_ref() {
            ProtobufValueRef::Bool(v) => ProtobufValueRef::Bool(v),
            ProtobufValueRef::U32(v) => ProtobufValueRef::U32(v),
            ProtobufValueRef::U64(v) => ProtobufValueRef::U64(v),
            ProtobufValueRef::I32(v) => ProtobufValueRef::I32(v),
            ProtobufValueRef::I64(v) => ProtobufValueRef::I64(v),
            ProtobufValueRef::F32(v) => ProtobufValueRef::F32(v),
            ProtobufValueRef::F64(v) => ProtobufValueRef::F64(v),
            ProtobufValueRef::Enum(v) => ProtobufValueRef::Enum(v),
            ProtobufValueRef::String(..)
            | ProtobufValueRef::Bytes(..)
            | ProtobufValueRef::Message(..) => unreachable!(),
        }
    }
}

impl ProtobufValue for u32 {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::U32(*self)
    }
}

impl ProtobufValue for u64 {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::U64(*self)
    }
}

impl ProtobufValue for i32 {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::I32(*self)
    }
}

impl ProtobufValue for i64 {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::I64(*self)
    }
}

impl ProtobufValue for f32 {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::F32(*self)
    }
}

impl ProtobufValue for f64 {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::F64(*self)
    }
}

impl ProtobufValue for bool {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::Bool(*self)
    }
}

impl ProtobufValue for String {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::String(*&self)
    }
}

impl ProtobufValue for str {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::String(self)
    }
}

impl ProtobufValue for Vec<u8> {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::Bytes(*&self)
    }
}

#[cfg(feature = "bytes")]
impl ProtobufValue for Bytes {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::Bytes(&*self)
    }
}

#[cfg(feature = "bytes")]
impl ProtobufValue for Chars {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::String(&*self)
    }
}

// conflicting implementations, so generated code is used instead
/*
impl<E : ProtobufEnum> ProtobufValue for E {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::Enum(self.descriptor())
    }
}

impl<M : Message> ProtobufValue for M {
    fn as_ref(&self) -> ProtobufValueRef {
        ProtobufValueRef::Message(self)
    }
}
*/

/// Dynamic reference to a value
pub enum ProtobufValueRef<'a> {
    /// `u32`
    U32(u32),
    /// `u64`
    U64(u64),
    /// `i32`
    I32(i32),
    /// `i64`
    I64(i64),
    /// `f32`
    F32(f32),
    /// `f64`
    F64(f64),
    /// `bool`
    Bool(bool),
    /// `string`
    String(&'a str),
    /// `bytes`
    Bytes(&'a [u8]),
    /// `enum`
    Enum(&'static EnumValueDescriptor),
    /// `message`
    Message(&'a Message),
}

impl<'a> ProtobufValueRef<'a> {
    /// Is value non-zero?
    pub fn is_non_zero(&self) -> bool {
        match *self {
            ProtobufValueRef::U32(v) => v != 0,
            ProtobufValueRef::U64(v) => v != 0,
            ProtobufValueRef::I32(v) => v != 0,
            ProtobufValueRef::I64(v) => v != 0,
            ProtobufValueRef::F32(v) => v != 0.,
            ProtobufValueRef::F64(v) => v != 0.,
            ProtobufValueRef::Bool(v) => v,
            ProtobufValueRef::String(v) => !v.is_empty(),
            ProtobufValueRef::Bytes(v) => !v.is_empty(),
            ProtobufValueRef::Enum(v) => v.value() != 0,
            ProtobufValueRef::Message(_) => true,
        }
    }
}