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/* 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 https://mozilla.org/MPL/2.0/. */
use crate::dom::bindings::codegen::Bindings::EventBinding::Event_Binding::EventMethods;
use crate::dom::bindings::codegen::Bindings::HTMLElementBinding::HTMLElementMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::DOMString;
use crate::dom::element::Element;
use crate::dom::eventtarget::EventTarget;
use crate::dom::htmldatalistelement::HTMLDataListElement;
use crate::dom::htmlelement::HTMLElement;
use crate::dom::node::Node;
use crate::dom::validitystate::{ValidationFlags, ValidityState};
use crate::script_runtime::CanGc;

/// Trait for elements with constraint validation support
pub trait Validatable {
    fn as_element(&self) -> ∈

    /// <https://html.spec.whatwg.org/multipage/#dom-cva-validity>
    fn validity_state(&self) -> DomRoot<ValidityState>;

    /// <https://html.spec.whatwg.org/multipage/#candidate-for-constraint-validation>
    fn is_instance_validatable(&self) -> bool;

    // Check if element satisfies its constraints, excluding custom errors
    fn perform_validation(&self, _validate_flags: ValidationFlags) -> ValidationFlags {
        ValidationFlags::empty()
    }

    /// <https://html.spec.whatwg.org/multipage/#concept-fv-valid>
    fn satisfies_constraints(&self) -> bool {
        self.validity_state().invalid_flags().is_empty()
    }

    /// <https://html.spec.whatwg.org/multipage/#check-validity-steps>
    fn check_validity(&self, can_gc: CanGc) -> bool {
        if self.is_instance_validatable() && !self.satisfies_constraints() {
            self.as_element()
                .upcast::<EventTarget>()
                .fire_cancelable_event(atom!("invalid"), can_gc);
            false
        } else {
            true
        }
    }

    /// <https://html.spec.whatwg.org/multipage/#report-validity-steps>
    fn report_validity(&self, can_gc: CanGc) -> bool {
        // Step 1.
        if !self.is_instance_validatable() {
            return true;
        }

        if self.satisfies_constraints() {
            return true;
        }

        // Step 1.1.
        let event = self
            .as_element()
            .upcast::<EventTarget>()
            .fire_cancelable_event(atom!("invalid"), can_gc);

        // Step 1.2.
        if !event.DefaultPrevented() {
            let flags = self.validity_state().invalid_flags();
            println!(
                "Validation error: {}",
                validation_message_for_flags(&self.validity_state(), flags)
            );
            if let Some(html_elem) = self.as_element().downcast::<HTMLElement>() {
                html_elem.Focus(can_gc);
            }
        }

        // Step 1.3.
        false
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-cva-validationmessage>
    fn validation_message(&self) -> DOMString {
        if self.is_instance_validatable() {
            let flags = self.validity_state().invalid_flags();
            validation_message_for_flags(&self.validity_state(), flags)
        } else {
            DOMString::new()
        }
    }
}

/// <https://html.spec.whatwg.org/multipage/#the-datalist-element%3Abarred-from-constraint-validation>
pub fn is_barred_by_datalist_ancestor(elem: &Node) -> bool {
    elem.upcast::<Node>()
        .ancestors()
        .any(|node| node.is::<HTMLDataListElement>())
}

// Get message for given validation flags or custom error message
fn validation_message_for_flags(state: &ValidityState, failed_flags: ValidationFlags) -> DOMString {
    if failed_flags.contains(ValidationFlags::CUSTOM_ERROR) {
        state.custom_error_message().clone()
    } else {
        DOMString::from(failed_flags.to_string())
    }
}