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use std::fs::File;
use std::io::{Write, Result};
use std::path::Path;
use std::string::ToString;
use html5ever::serialize::{Serializable, Serializer, TraversalScope, serialize, SerializeOpts};
use html5ever::serialize::TraversalScope::*;

use tree::{NodeRef, NodeData};


impl Serializable for NodeRef {
    fn serialize<'wr, Wr: Write>(&self, serializer: &mut Serializer<'wr, Wr>,
                                 traversal_scope: TraversalScope) -> Result<()> {
        match (traversal_scope, self.data()) {
            (_, &NodeData::Element(ref element)) => {
                if traversal_scope == IncludeNode {
                    try!(serializer.start_elem(
                        element.name.clone(),
                        element.attributes.borrow().map.iter().map(|(name, value)| (name, &**value))));
                }

                for child in self.children() {
                    try!(Serializable::serialize(&child, serializer, IncludeNode));
                }

                if traversal_scope == IncludeNode {
                    try!(serializer.end_elem(element.name.clone()));
                }
                Ok(())
            }

            (_, &NodeData::DocumentFragment) |
            (_, &NodeData::Document(_)) => {
                for child in self.children() {
                    try!(Serializable::serialize(&child, serializer, IncludeNode));
                }
                Ok(())
            }

            (ChildrenOnly, _) => Ok(()),

            (IncludeNode, &NodeData::Doctype(ref doctype)) => serializer.write_doctype(&doctype.name),
            (IncludeNode, &NodeData::Text(ref text)) => serializer.write_text(&text.borrow()),
            (IncludeNode, &NodeData::Comment(ref text)) => serializer.write_comment(&text.borrow()),
        }
    }
}


impl ToString for NodeRef {
    #[inline]
    fn to_string(&self) -> String {
        let mut u8_vec = Vec::new();
        self.serialize(&mut u8_vec).unwrap();
        String::from_utf8(u8_vec).unwrap()
    }
}

impl NodeRef {
    /// Serialize this node and its descendants in HTML syntax to the given stream.
    #[inline]
    pub fn serialize<W: Write>(&self, writer: &mut W) -> Result<()> {
        serialize(writer, self, SerializeOpts {
            traversal_scope: IncludeNode,
            ..Default::default()
        })
    }

    /// Serialize this node and its descendants in HTML syntax to a new file at the given path.
    #[inline]
    pub fn serialize_to_file<P: AsRef<Path>>(&self, path: P) -> Result<()>{
        let mut file = try!(File::create(&path));
        self.serialize(&mut file)
    }
}