exml 0.7.3-deprecated

use std::{
    cell::RefCell,
    collections::HashMap,
    mem::replace,
    rc::{Rc, Weak},
    sync::Arc,
};

use super::{
    NodeType,
    document::{Document, DocumentRef},
    node::{Node, NodeConnection, NodeRef, NodeStrongRef},
    user_data::{DOMUserData, OperationType, UserDataHandler},
};

/// Implementation of [DocumentFragment](https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/DOM3-Core.html#core-ID-B63ED1A3)
/// interface on [1.4 Fundamental Interfaces: Core Module](https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/DOM3-Core.html#core-ID-BBACDC08)
pub struct DocumentFragment {
    // /// [1.1.1 The DOM Structure Model](https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/DOM3-Core.html#core-ID-1590626202)
    // /// - no parent
    // parent_node: Option<NodeWeakRef>,
    /// [1.1.1 The DOM Structure Model](https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/DOM3-Core.html#core-ID-1590626202)  
    /// - `Element`
    /// - `ProcessingInstruction`
    /// - `Comment`
    /// - `Text`
    /// - `CDATASection`
    /// - `EntityReference`
    first_child: Option<NodeStrongRef>,
    last_child: Option<NodeStrongRef>,
    // /// [1.1.1 The DOM Structure Model](https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/DOM3-Core.html#core-ID-1590626202)
    // /// - no sibling
    // previous_sibling: Option<NodeWeakRef>,
    // next_sibling: Option<NodeRef>,
    owner_document: Weak<RefCell<Document>>,

    user_data: Option<HashMap<String, (DOMUserData, Option<Arc<dyn UserDataHandler>>)>>,
}

impl DocumentFragment {
    pub fn owner_document(&self) -> Option<DocumentRef> {
        self.owner_document.upgrade().map(From::from)
    }

    fn adopted_to(&mut self, new_doc: DocumentRef) {
        self.owner_document = Rc::downgrade(&new_doc.0);
        let mut children = self.first_child.clone().map(NodeRef::from);
        while let Some(mut child) = children {
            child.adopted_to(new_doc.clone());
            children = child.next_sibling();
        }
    }
}

/// Wrapper of `Rc<RefCell<DocumentFragment>>`.
#[derive(Clone)]
pub struct DocumentFragmentRef(
    pub(super) Rc<RefCell<DocumentFragment>>,
    pub(super) DocumentRef,
);

impl DocumentFragmentRef {
    /// Create new [`DocumentFragmentRef`] whose ownerDocument is `doc`.
    pub(super) fn from_doc(doc: DocumentRef) -> Self {
        Self(
            Rc::new(RefCell::new(DocumentFragment {
                first_child: None,
                last_child: None,
                owner_document: Rc::downgrade(&doc.0),
                user_data: None,
            })),
            doc,
        )
    }
}

impl Node for DocumentFragmentRef {
    fn node_name(&self) -> Rc<str> {
        "#document-fragment".into()
    }

    fn node_value(&self) -> Option<Rc<str>> {
        None
    }

    fn set_node_value(&mut self, _: impl Into<String>) -> Result<(), super::DOMException> {
        Ok(())
    }

    fn node_type(&self) -> NodeType {
        NodeType::DocumentFragment
    }

    fn first_child(&self) -> Option<NodeRef> {
        self.0.borrow().first_child.clone().map(From::from)
    }

    fn last_child(&self) -> Option<NodeRef> {
        self.0.borrow().last_child.clone().map(From::from)
    }

    fn owner_document(&self) -> Option<DocumentRef> {
        Some(self.1.clone())
    }

    fn clone_node(&self, deep: bool) -> NodeRef {
        let mut frag = DocumentFragmentRef(
            Rc::new(RefCell::new(DocumentFragment {
                first_child: None,
                last_child: None,
                owner_document: self.0.borrow().owner_document.clone(),
                user_data: None,
            })),
            self.1.clone(),
        );

        if deep {
            let mut children = self.first_child();
            while let Some(child) = children {
                children = child.next_sibling();
                frag.append_child(child.clone_node(true))
                    .expect("Internal Error");
            }
        }

        self.handle_user_data(OperationType::NodeCloned, Some(frag.clone().into()));
        frag.into()
    }

    fn is_same_node(&self, other: &NodeRef) -> bool {
        let NodeRef::DocumentFragment(other) = other else {
            return false;
        };
        Rc::ptr_eq(&self.0, &other.0)
    }

    fn lookup_prefix(&self, _ns_uri: &str) -> Option<Rc<str>> {
        None
    }

    fn is_default_namespace(&self, _ns_uri: &str) -> bool {
        false
    }

    fn lookup_namespace_uri(&self, _prefix: Option<&str>) -> Option<Rc<str>> {
        None
    }

    fn set_user_data(
        &mut self,
        key: impl Into<String>,
        data: DOMUserData,
        handler: Option<Arc<dyn UserDataHandler>>,
    ) -> Option<DOMUserData> {
        self.0
            .borrow_mut()
            .user_data
            .get_or_insert_default()
            .insert(key.into(), (data, handler))
            .map(|v| v.0)
    }

    fn get_user_data(&self, key: &str) -> Option<DOMUserData> {
        self.0
            .borrow()
            .user_data
            .as_ref()
            .and_then(|user_data| user_data.get(key))
            .map(|v| v.0.clone())
    }

    fn is_read_only(&self) -> bool {
        false
    }
}

impl NodeConnection for DocumentFragmentRef {
    fn set_parent_node(&mut self, _: Option<NodeRef>) -> Option<NodeRef> {
        None
    }

    fn set_first_child(&mut self, new_child: Option<NodeRef>) -> Option<NodeRef> {
        replace(
            &mut self.0.borrow_mut().first_child,
            new_child.map(From::from),
        )
        .map(From::from)
    }

    fn set_last_child(&mut self, new_child: Option<NodeRef>) -> Option<NodeRef> {
        replace(
            &mut self.0.borrow_mut().last_child,
            new_child.map(From::from),
        )
        .map(From::from)
    }

    fn set_previous_sibling(&mut self, _: Option<NodeRef>) -> Option<NodeRef> {
        None
    }

    fn set_next_sibling(&mut self, _: Option<NodeRef>) -> Option<NodeRef> {
        None
    }

    fn set_owner_document(&mut self, new_doc: DocumentRef) -> Option<DocumentRef> {
        self.0.borrow_mut().owner_document = Rc::downgrade(&new_doc.0);
        Some(replace(&mut self.1, new_doc))
    }

    fn adopted_to(&mut self, new_doc: DocumentRef) {
        self.0.borrow_mut().adopted_to(new_doc);

        if let Some(user_data) = self.0.borrow().user_data.as_ref() {
            for (key, value) in user_data.iter() {
                if let Some(handler) = value.1.clone() {
                    handler.handle(
                        OperationType::NodeAdopted,
                        key.as_str(),
                        value.0.clone(),
                        self.clone().into(),
                        None,
                    );
                }
            }
        }
    }

    fn handle_user_data(&self, operation: OperationType, dst: Option<NodeRef>) {
        if let Some(user_data) = self.0.borrow().user_data.as_ref() {
            for (key, value) in user_data.iter() {
                if let Some(handler) = value.1.clone() {
                    handler.handle(
                        operation,
                        key.as_str(),
                        value.0.clone(),
                        self.clone().into(),
                        dst.clone(),
                    );
                }
            }
        }
    }
}

impl From<DocumentFragmentRef> for NodeRef {
    fn from(value: DocumentFragmentRef) -> Self {
        NodeRef::DocumentFragment(value)
    }
}

impl From<Rc<RefCell<DocumentFragment>>> for DocumentFragmentRef {
    fn from(value: Rc<RefCell<DocumentFragment>>) -> Self {
        let doc = value.borrow().owner_document().unwrap();
        Self(value, doc)
    }
}