/*

 * Copyright (c) 2020, the SerenityOS developers.

 * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <LibWeb/Bindings/Intrinsics.h>

#include <LibWeb/Bindings/MouseEventPrototype.h>

#include <LibWeb/HTML/EventNames.h>

#include <LibWeb/UIEvents/EventNames.h>

#include <LibWeb/UIEvents/KeyCode.h>

#include <LibWeb/UIEvents/MouseButton.h>

#include <LibWeb/UIEvents/MouseEvent.h>

namespace Web::UIEvents {

JS_DEFINE_ALLOCATOR(MouseEvent);

MouseEvent::MouseEvent(JS::Realm& realm, FlyString const& event_name, MouseEventInit const& event_init, double page_x, double page_y, double offset_x, double offset_y)

    : UIEvent(realm, event_name, event_init)

    , m_screen_x(event_init.screen_x)

    , m_screen_y(event_init.screen_y)

    , m_page_x(page_x)

    , m_page_y(page_y)

    , m_client_x(event_init.client_x)

    , m_client_y(event_init.client_y)

    , m_offset_x(offset_x)

    , m_offset_y(offset_y)

    , m_ctrl_key(event_init.ctrl_key)

    , m_shift_key(event_init.shift_key)

    , m_alt_key(event_init.alt_key)

    , m_meta_key(event_init.meta_key)

    , m_modifier_alt_graph(event_init.modifier_alt_graph)

    , m_modifier_caps_lock(event_init.modifier_caps_lock)

    , m_modifier_fn(event_init.modifier_fn)

    , m_modifier_fn_lock(event_init.modifier_fn_lock)

    , m_modifier_hyper(event_init.modifier_hyper)

    , m_modifier_num_lock(event_init.modifier_num_lock)

    , m_modifier_scroll_lock(event_init.modifier_scroll_lock)

    , m_modifier_super(event_init.modifier_super)

    , m_modifier_symbol(event_init.modifier_symbol)

    , m_modifier_symbol_lock(event_init.modifier_symbol_lock)

    , m_movement_x(event_init.movement_x)

    , m_movement_y(event_init.movement_y)

    , m_button(event_init.button)

    , m_buttons(event_init.buttons)

    , m_related_target(event_init.related_target)

{

}

MouseEvent::~MouseEvent() = default;

void MouseEvent::initialize(JS::Realm& realm)

{

    Base::initialize(realm);

    WEB_SET_PROTOTYPE_FOR_INTERFACE(MouseEvent);

}

void MouseEvent::visit_edges(Cell::Visitor& visitor)

{

    Base::visit_edges(visitor);

    visitor.visit(m_related_target);

}

bool MouseEvent::get_modifier_state(String const& key_arg) const

{

    if (key_arg == "Control")

        return m_ctrl_key;

    if (key_arg == "Shift")

        return m_shift_key;

    if (key_arg == "Alt")

        return m_alt_key;

    if (key_arg == "Meta")

        return m_meta_key;

    if (key_arg == "AltGraph")

        return m_modifier_alt_graph;

    if (key_arg == "CapsLock")

        return m_modifier_caps_lock;

    if (key_arg == "Fn")

        return m_modifier_fn;

    if (key_arg == "FnLock")

        return m_modifier_fn_lock;

    if (key_arg == "Hyper")

        return m_modifier_hyper;

    if (key_arg == "NumLock")

        return m_modifier_num_lock;

    if (key_arg == "ScrollLock")

        return m_modifier_scroll_lock;

    if (key_arg == "Super")

        return m_modifier_super;

    if (key_arg == "Symbol")

        return m_modifier_symbol;

    if (key_arg == "SymbolLock")

        return m_modifier_symbol_lock;

    return false;

}

// https://w3c.github.io/uievents/#dom-mouseevent-initmouseevent

void MouseEvent::init_mouse_event(String const& type, bool bubbles, bool cancelable, HTML::Window* view, WebIDL::Long detail, WebIDL::Long screen_x, WebIDL::Long screen_y, WebIDL::Long client_x, WebIDL::Long client_y, bool ctrl_key, bool alt_key, bool shift_key, bool meta_key, WebIDL::Short button, DOM::EventTarget* related_target)

{

    // Initializes attributes of a MouseEvent object. This method has the same behavior as UIEvent.initUIEvent().

    // 1. If this’s dispatch flag is set, then return.

    if (dispatched())

        return;

    // 2. Initialize this with type, bubbles, and cancelable.

    initialize_event(type, bubbles, cancelable);

    // Implementation Defined: Initialise other values.

    m_view = view;

    m_detail = detail;

    m_screen_x = screen_x;

    m_screen_y = screen_y;

    m_client_x = client_x;

    m_client_y = client_y;

    m_ctrl_key = ctrl_key;

    m_shift_key = shift_key;

    m_alt_key = alt_key;

    m_meta_key = meta_key;

    m_button = button;

    m_related_target = related_target;

}

JS::NonnullGCPtr<MouseEvent> MouseEvent::create(JS::Realm& realm, FlyString const& event_name, MouseEventInit const& event_init, double page_x, double page_y, double offset_x, double offset_y)

{

    return realm.heap().allocate<MouseEvent>(realm, realm, event_name, event_init, page_x, page_y, offset_x, offset_y);

}

WebIDL::ExceptionOr<JS::NonnullGCPtr<MouseEvent>> MouseEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, MouseEventInit const& event_init)

{

    return create(realm, event_name, event_init);

}

WebIDL::ExceptionOr<JS::NonnullGCPtr<MouseEvent>> MouseEvent::create_from_platform_event(JS::Realm& realm, FlyString const& event_name, CSSPixelPoint screen, CSSPixelPoint page, CSSPixelPoint client, CSSPixelPoint offset, Optional<CSSPixelPoint> movement, unsigned button, unsigned buttons, unsigned modifiers)

{

    MouseEventInit event_init {};

    event_init.ctrl_key = modifiers & Mod_Ctrl;

    event_init.shift_key = modifiers & Mod_Shift;

    event_init.alt_key = modifiers & Mod_Alt;

    event_init.meta_key = modifiers & Mod_Super;

    event_init.screen_x = screen.x().to_double();

    event_init.screen_y = screen.y().to_double();

    event_init.client_x = client.x().to_double();

    event_init.client_y = client.y().to_double();

    if (movement.has_value()) {

        event_init.movement_x = movement.value().x().to_double();

        event_init.movement_y = movement.value().y().to_double();

    }

    event_init.button = mouse_button_to_button_code(static_cast<MouseButton>(button));

    event_init.buttons = buttons;

    auto event = MouseEvent::create(realm, event_name, event_init, page.x().to_double(), page.y().to_double(), offset.x().to_double(), offset.y().to_double());

    event->set_is_trusted(true);

    event->set_bubbles(true);

    event->set_cancelable(true);

    event->set_composed(true);

    return event;

}

}