/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use dom::attr::Attr;
use dom::attr::AttrHelpers;
use dom::bindings::codegen::Bindings::HTMLButtonElementBinding;
use dom::bindings::codegen::Bindings::HTMLButtonElementBinding::HTMLButtonElementMethods;
use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLElementCast, NodeCast};
use dom::bindings::codegen::InheritTypes::{HTMLButtonElementDerived, HTMLFieldSetElementDerived};
use dom::bindings::js::{JSRef, Temporary};
use dom::document::Document;
use dom::element::{AttributeHandlers, Element, ElementTypeId};
use dom::eventtarget::{EventTarget, EventTargetTypeId};
use dom::htmlelement::HTMLElement;
use dom::node::{DisabledStateHelpers, Node, NodeHelpers, NodeTypeId, window_from_node};
use dom::validitystate::ValidityState;
use dom::virtualmethods::VirtualMethods;

use std::ascii::OwnedAsciiExt;
use servo_util::str::DOMString;
use string_cache::Atom;

#[dom_struct]
pub struct HTMLButtonElement {
    htmlelement: HTMLElement
}

impl HTMLButtonElementDerived for EventTarget {
    fn is_htmlbuttonelement(&self) -> bool {
        *self.type_id() == EventTargetTypeId::Node(NodeTypeId::Element(ElementTypeId::HTMLButtonElement))
    }
}

impl HTMLButtonElement {
    fn new_inherited(localName: DOMString, prefix: Option<DOMString>, document: JSRef<Document>) -> HTMLButtonElement {
        HTMLButtonElement {
            htmlelement: HTMLElement::new_inherited(ElementTypeId::HTMLButtonElement, localName, prefix, document)
        }
    }

    #[allow(unrooted_must_root)]
    pub fn new(localName: DOMString, prefix: Option<DOMString>, document: JSRef<Document>) -> Temporary<HTMLButtonElement> {
        let element = HTMLButtonElement::new_inherited(localName, prefix, document);
        Node::reflect_node(box element, document, HTMLButtonElementBinding::Wrap)
    }
}

impl<'a> HTMLButtonElementMethods for JSRef<'a, HTMLButtonElement> {
    fn Validity(self) -> Temporary<ValidityState> {
        let window = window_from_node(self).root();
        ValidityState::new(window.r())
    }

    // http://www.whatwg.org/html/#dom-fe-disabled
    make_bool_getter!(Disabled)

    // http://www.whatwg.org/html/#dom-fe-disabled
    make_bool_setter!(SetDisabled, "disabled")

    // https://html.spec.whatwg.org/multipage/forms.html#dom-button-type
    fn Type(self) -> DOMString {
        let elem: JSRef<Element> = ElementCast::from_ref(self);
        let ty = elem.get_string_attribute(&atom!("type")).into_ascii_lower();
        // https://html.spec.whatwg.org/multipage/forms.html#attr-button-type
        match ty.as_slice() {
            "reset" | "button" | "menu" => ty,
            _ => "submit".into_string()
        }
    }

    // https://html.spec.whatwg.org/multipage/forms.html#dom-button-type
    make_setter!(SetType, "type")
}

impl<'a> VirtualMethods for JSRef<'a, HTMLButtonElement> {
    fn super_type<'a>(&'a self) -> Option<&'a VirtualMethods> {
        let htmlelement: &JSRef<HTMLElement> = HTMLElementCast::from_borrowed_ref(self);
        Some(htmlelement as &VirtualMethods)
    }

    fn after_set_attr(&self, attr: JSRef<Attr>) {
        match self.super_type() {
            Some(ref s) => s.after_set_attr(attr),
            _ => (),
        }

        match attr.local_name() {
            &atom!("disabled") => {
                let node: JSRef<Node> = NodeCast::from_ref(*self);
                node.set_disabled_state(true);
                node.set_enabled_state(false);
            },
            _ => ()
        }
    }

    fn before_remove_attr(&self, attr: JSRef<Attr>) {
        match self.super_type() {
            Some(ref s) => s.before_remove_attr(attr),
            _ => (),
        }

        match attr.local_name() {
            &atom!("disabled") => {
                let node: JSRef<Node> = NodeCast::from_ref(*self);
                node.set_disabled_state(false);
                node.set_enabled_state(true);
                node.check_ancestors_disabled_state_for_form_control();
            },
            _ => ()
        }
    }

    fn bind_to_tree(&self, tree_in_doc: bool) {
        match self.super_type() {
            Some(ref s) => s.bind_to_tree(tree_in_doc),
            _ => (),
        }

        let node: JSRef<Node> = NodeCast::from_ref(*self);
        node.check_ancestors_disabled_state_for_form_control();
    }

    fn unbind_from_tree(&self, tree_in_doc: bool) {
        match self.super_type() {
            Some(ref s) => s.unbind_from_tree(tree_in_doc),
            _ => (),
        }

        let node: JSRef<Node> = NodeCast::from_ref(*self);
        if node.ancestors().any(|ancestor| ancestor.is_htmlfieldsetelement()) {
            node.check_ancestors_disabled_state_for_form_control();
        } else {
            node.check_disabled_attribute();
        }
    }
}