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use super::namespaces::Namespace;

#[derive(Debug, PartialEq)]
pub struct Attribute<'a> {
    namespace: &'a Namespace,
    name: String,
    value: String,
}
impl<'a> Attribute<'a> {
    pub fn new(namespace: &'a Namespace, name: String, value: String) -> Attribute<'a> {
        Attribute {
            namespace,
            name,
            value,
        }
    }
}

#[derive(Debug, PartialEq)]
pub struct Comment {
    data: String,
}

#[derive(Debug, PartialEq)]
pub struct DocumentFragment<'a> {
    children: Vec<Node<'a>>,
}

#[derive(Debug, PartialEq)]
pub struct Element<'a> {
    namespace: &'a Namespace,
    local_name: String,
    attributes: Vec<Attribute<'a>>,
    children: Vec<Node<'a>>,
}

#[derive(Debug, PartialEq)]
pub struct Text {
    data: String,
}

#[derive(Debug, PartialEq)]
pub enum Node<'a> {
    CommentNode(Comment),
    DocumentFragmentNode(DocumentFragment<'a>),
    ElementNode(Element<'a>),
    TextNode(Text),
}

impl<'a> Node<'a> {
    pub fn new_comment(data: String) -> Node<'a> {
        Node::CommentNode(Comment { data })
    }

    pub fn new_document_fragment(children: Vec<Node<'a>>) -> Node<'a> {
        Node::DocumentFragmentNode(DocumentFragment { children })
    }

    pub fn new_element(
        namespace: &'a Namespace,
        local_name: String,
        attributes: Vec<Attribute<'a>>,
        children: Vec<Node<'a>>,
    ) -> Node<'a> {
        Node::ElementNode(Element {
            namespace,
            local_name,
            attributes,
            children,
        })
    }

    pub fn new_text(data: String) -> Node<'a> {
        Node::TextNode(Text { data })
    }
}

pub struct Serializer {}

impl Serializer {
    pub fn new() -> Serializer {
        Serializer {}
    }

    pub fn serialize(&self, namespace: &Namespace, node: Node) -> String {
        let mut xml = String::new();

        match node {
            Node::CommentNode(c) => {
                xml.push_str(&format!("<!--{}-->", &c.data));
            }
            Node::DocumentFragmentNode(document_fragment) => {
                if document_fragment.children.len() > 0 {
                    for child in document_fragment.children {
                        xml.push_str(&self.serialize(namespace, child));
                    }
                }
            }
            Node::ElementNode(e) => {
                if e.namespace == namespace {
                    xml.push_str(&format!("<{}", &e.local_name));
                } else {
                    xml.push_str(&format!(
                        "<{} xmlns=\"{}\"",
                        &e.local_name, &e.namespace.uri
                    ));
                }

                if e.attributes.len() > 0 {
                    for attr in e.attributes {
                        if attr.namespace == e.namespace {
                            xml.push_str(&format!(" {}=\"{}\"", &attr.name, &attr.value));
                        } else {
                            xml.push_str(&format!(
                                " {}:{}=\"{}\"",
                                &attr.namespace.prefix, &attr.name, &attr.value
                            ));
                        }
                    }
                }

                if e.children.len() == 0 {
                    xml.push_str("/>");
                } else {
                    xml.push_str(">");

                    for child in e.children {
                        xml.push_str(&self.serialize(e.namespace, child));
                    }

                    xml.push_str(&format!("</{}>", &e.local_name));
                }
            }
            Node::TextNode(t) => {
                xml.push_str(&t.data);
            }
        }

        xml
    }
}

#[cfg(test)]
mod tests {
    use super::super::namespaces::NamespaceRegistry;
    use super::*;

    #[test]
    fn new_namespaces() {
        let nr = NamespaceRegistry::new();
        let xmlns = nr.get("xml").unwrap();
        assert_eq!(xmlns.prefix, "xml");
        assert_eq!(xmlns.uri, "http://www.w3.org/XML/1998/namespace");

        let xhtmlns = nr.get("xhtml").unwrap();
        assert_eq!(xhtmlns.prefix, "xhtml");
        assert_eq!(xhtmlns.uri, "http://www.w3.org/1999/xhtml");

        let mathmlns = nr.get("mathml").unwrap();
        assert_eq!(mathmlns.prefix, "mathml");
        assert_eq!(mathmlns.uri, "http://www.w3.org/1998/Math/MathML");

        let svgns = nr.get("svg").unwrap();
        assert_eq!(svgns.prefix, "svg");
        assert_eq!(svgns.uri, "http://www.w3.org/2000/svg");
    }

    #[test]
    fn serializing() {
        let nr = NamespaceRegistry::new();
        let xmlns = nr.get("xml").unwrap();
        let xhtmlns = nr.get("xhtml").unwrap();

        let text = Node::new_text("Example text.".to_owned());
        let comment = Node::new_comment("Example comment.".to_owned());
        let attribute = Attribute::new(&xhtmlns, "title".to_owned(), "My tooltip.".to_owned());
        let br = Node::new_element(&xhtmlns, "br".to_owned(), vec![], vec![]);
        let p = Node::new_element(
            &xhtmlns,
            "p".to_owned(),
            vec![attribute],
            vec![text, br, comment],
        );

        let serializer = Serializer::new();
        let xml = serializer.serialize(&xmlns, p);

        assert_eq!(
            xml,
            "<p xmlns=\"http://www.w3.org/1999/xhtml\" title=\"My tooltip.\">Example text.<br/><!--Example comment.--></p>"
        );
        println!("xml={}", xml);
    }
}