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// Copyright (c) 2013-2015 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

use {Word, Result};
use private::layout::{StructReader, StructBuilder, StructSize, PointerBuilder, PointerReader};

pub trait FromStructReader<'a> {
    fn new(reader : StructReader<'a>) -> Self;
}

pub trait HasStructSize {
    fn struct_size() -> StructSize;
}

pub trait FromStructBuilder<'a> {
    fn new(structBuilder: StructBuilder<'a>) -> Self;
}

pub trait FromPointerReader<'a> : Sized {
    fn get_from_pointer(reader: &PointerReader<'a>) -> Result<Self>;
}

/// Associated types hackery that allows us to reason about Cap'n Proto types
/// without needing to give them a lifetime `'a`.
///
/// If `Foo` is a Cap'n Proto struct and `Bar` is a Rust-native struct, then
/// `foo::Reader<'a>` is to `foo::Owned` as `&'a Bar` is to `Bar`, and
/// `foo::Builder<'a>` is to `foo::Owned` as `&'a mut Bar` is to `Bar`.
/// The relationship is formalized by an `impl <'a> capnp::traits::Owned<'a> for foo::Owned`.
/// Because Cap'n Proto struct layout differs from Rust struct layout,
/// `foo::Owned` cannot be an inhabited type; it is useful nonetheless
/// as a type parameter, e.g. for a generic container that owns a Cap'n Proto message
/// of type `T: for<'a> capnp::traits::Owned<'a>`.
pub trait Owned<'a> {
    type Reader: FromPointerReader<'a> + SetPointerBuilder<Self::Builder>;
    type Builder: FromPointerBuilder<'a>;
}

pub trait OwnedStruct<'a> {
    type Reader: FromStructReader<'a>;
    type Builder: FromStructBuilder<'a> + HasStructSize;
}

pub trait Pipelined {
    type Pipeline;
}

pub trait FromPointerReaderRefDefault<'a> {
    fn get_from_pointer(reader: &PointerReader<'a>, default_value : *const Word) -> Self;
}

pub trait FromPointerBuilder<'a> : Sized {
    fn init_pointer(PointerBuilder<'a>, u32) -> Self;
    fn get_from_pointer(builder: PointerBuilder<'a>) -> Result<Self>;
}

pub trait FromPointerBuilderRefDefault<'a> {
    fn get_from_pointer(builder: PointerBuilder<'a>, default_value: *const Word) -> Self;
}

pub trait SetPointerBuilder<To> {
    fn set_pointer_builder<'a>(PointerBuilder<'a>, Self) -> Result<()>;
}

pub trait HasTypeId {
    fn type_id() -> u64;
}

pub trait ToU16 {
    fn to_u16(self) -> u16;
}

pub trait FromU16 : Sized {
    fn from_u16(value: u16) -> ::std::result::Result<Self, ::NotInSchema>;
}

pub trait IndexMove<I, T> {
    fn index_move(&self, index: I) -> T;
}

pub struct ListIter<T, U> {
    marker : ::std::marker::PhantomData<U>,
    list : T,
    index : u32,
    size : u32,
}

impl <T, U> ListIter<T, U> {
    pub fn new(list : T, size : u32) -> ListIter<T, U> {
        ListIter { list : list, index : 0, size : size, marker : ::std::marker::PhantomData }
    }
}

impl <U, T : IndexMove<u32, U>> ::std::iter::Iterator for ListIter<T, U> {
    type Item = U;
    fn next(&mut self) -> ::std::option::Option<U> {
        if self.index < self.size {
            let result = self.list.index_move(self.index);
            self.index += 1;
            return Some(result);
        } else {
            return None;
        }
    }
}