/*
 * Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.org>
 * Copyright (c) 2022, Adam Hodgen <ant1441@gmail.com>
 * Copyright (c) 2023, Bastiaan van der Plaat <bastiaan.v.d.plaat@gmail.com>
 * Copyright (c) 2024, Jelle Raaijmakers <jelle@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <LibWeb/DOM/DocumentLoadEventDelayer.h>
#include <LibWeb/DOM/Text.h>
#include <LibWeb/FileAPI/FileList.h>
#include <LibWeb/HTML/ColorPickerUpdateState.h>
#include <LibWeb/HTML/FileFilter.h>
#include <LibWeb/HTML/FormAssociatedElement.h>
#include <LibWeb/HTML/HTMLElement.h>
#include <LibWeb/Layout/ImageProvider.h>
#include <LibWeb/WebIDL/DOMException.h>
#include <LibWeb/WebIDL/Types.h>

namespace Web::HTML {

// https://html.spec.whatwg.org/multipage/input.html#attr-input-type
#define ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTES                                  \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("hidden", Hidden)                   \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("text", Text)                       \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("search", Search)                   \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("tel", Telephone)                   \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("url", URL)                         \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("email", Email)                     \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("password", Password)               \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("date", Date)                       \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("month", Month)                     \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("week", Week)                       \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("time", Time)                       \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("datetime-local", LocalDateAndTime) \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("number", Number)                   \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("range", Range)                     \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("color", Color)                     \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("checkbox", Checkbox)               \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("radio", RadioButton)               \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("file", FileUpload)                 \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("submit", SubmitButton)             \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("image", ImageButton)               \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("reset", ResetButton)               \
    __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE("button", Button)

class HTMLInputElement final
    : public HTMLElement
    , public FormAssociatedTextControlElement
    , public Layout::ImageProvider {
    WEB_PLATFORM_OBJECT(HTMLInputElement, HTMLElement);
    GC_DECLARE_ALLOCATOR(HTMLInputElement);
    FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLInputElement)

public:
    virtual ~HTMLInputElement() override;

    virtual GC::Ptr<Layout::Node> create_layout_node(GC::Ref<CSS::ComputedProperties>) override;
    virtual void adjust_computed_style(CSS::ComputedProperties&) override;

    enum class TypeAttributeState {
#define __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE(_, state) state,
        ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTES
#undef __ENUMERATE_HTML_INPUT_TYPE_ATTRIBUTE
    };

    StringView type() const;
    TypeAttributeState type_state() const { return m_type; }
    WebIDL::ExceptionOr<void> set_type(String const&);

    String default_value() const { return get_attribute_value(HTML::AttributeNames::value); }

    virtual String value() const override;
    WebIDL::ExceptionOr<void> set_value(String const&);

    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#concept-textarea/input-relevant-value
    virtual String relevant_value() override { return value(); }
    WebIDL::ExceptionOr<void> set_relevant_value(String const& value) override { return set_value(value); }

    virtual void set_dirty_value_flag(bool flag) override { m_dirty_value = flag; }

    void commit_pending_changes();

    String placeholder() const;
    Optional<String> placeholder_value() const;

    bool checked() const { return m_checked; }
    void set_checked(bool);

    bool checked_binding() const { return checked(); }
    void set_checked_binding(bool);

    bool indeterminate() const { return m_indeterminate; }
    void set_indeterminate(bool);

    void did_pick_color(Optional<Color> picked_color, ColorPickerUpdateState state);

    enum class MultipleHandling {
        Replace,
        Append,
    };
    void did_select_files(Span<SelectedFile> selected_files, MultipleHandling = MultipleHandling::Replace);

    GC::Ptr<FileAPI::FileList> files();
    void set_files(GC::Ptr<FileAPI::FileList>);

    FileFilter parse_accept_attribute() const;

    // NOTE: User interaction
    // https://html.spec.whatwg.org/multipage/input.html#update-the-file-selection
    void update_the_file_selection(GC::Ref<FileAPI::FileList>);

    WebIDL::Long max_length() const;
    WebIDL::ExceptionOr<void> set_max_length(WebIDL::Long);

    WebIDL::Long min_length() const;
    WebIDL::ExceptionOr<void> set_min_length(WebIDL::Long);

    WebIDL::UnsignedLong size() const;
    WebIDL::ExceptionOr<void> set_size(WebIDL::UnsignedLong value);

    WebIDL::UnsignedLong height() const;
    WebIDL::ExceptionOr<void> set_height(WebIDL::UnsignedLong value);

    WebIDL::UnsignedLong width() const;
    WebIDL::ExceptionOr<void> set_width(WebIDL::UnsignedLong value);

    struct SelectedCoordinate {
        int x { 0 };
        int y { 0 };
    };
    SelectedCoordinate selected_coordinate() const { return m_selected_coordinate; }

    JS::Object* value_as_date() const;
    WebIDL::ExceptionOr<void> set_value_as_date(Optional<GC::Root<JS::Object>> const&);

    double value_as_number() const;
    WebIDL::ExceptionOr<void> set_value_as_number(double value);

    WebIDL::ExceptionOr<void> step_up(WebIDL::Long n = 1);
    WebIDL::ExceptionOr<void> step_down(WebIDL::Long n = 1);

    WebIDL::ExceptionOr<bool> check_validity();
    WebIDL::ExceptionOr<bool> report_validity();
    void set_custom_validity(String const&);

    WebIDL::ExceptionOr<void> show_picker();

    // ^EventTarget
    // https://html.spec.whatwg.org/multipage/interaction.html#the-tabindex-attribute:the-input-element
    // https://html.spec.whatwg.org/multipage/interaction.html#focusable-area
    // https://html.spec.whatwg.org/multipage/semantics-other.html#concept-element-disabled
    virtual bool is_focusable() const override;

    // ^FormAssociatedElement
    // https://html.spec.whatwg.org/multipage/forms.html#category-listed
    virtual bool is_listed() const override { return true; }

    // https://html.spec.whatwg.org/multipage/forms.html#category-submit
    virtual bool is_submittable() const override { return true; }

    // https://html.spec.whatwg.org/multipage/forms.html#category-reset
    virtual bool is_resettable() const override { return true; }

    // https://html.spec.whatwg.org/multipage/forms.html#category-autocapitalize
    virtual bool is_auto_capitalize_inheriting() const override { return true; }

    // https://html.spec.whatwg.org/multipage/forms.html#concept-button
    virtual bool is_button() const override;

    // https://html.spec.whatwg.org/multipage/forms.html#concept-submit-button
    virtual bool is_submit_button() const override;

    bool is_single_line() const;

    virtual void reset_algorithm() override;
    virtual void clear_algorithm() override;

    virtual void form_associated_element_was_inserted() override;
    virtual void form_associated_element_was_removed(DOM::Node*) override;
    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&, Optional<FlyString> const&) override;

    virtual WebIDL::ExceptionOr<void> cloned(Node&, bool) const override;

    GC::Ref<ValidityState const> validity() const;

    // ^HTMLElement
    // https://html.spec.whatwg.org/multipage/forms.html#category-label
    virtual bool is_labelable() const override { return type_state() != TypeAttributeState::Hidden; }

    virtual Optional<ARIA::Role> default_role() const override;

    GC::Ptr<Element> placeholder_element() { return m_placeholder_element; }
    GC::Ptr<Element const> placeholder_element() const { return m_placeholder_element; }

    virtual bool has_activation_behavior() const override;
    virtual void activation_behavior(DOM::Event const&) override;

    bool has_input_activation_behavior() const;
    bool change_event_applies() const;
    bool value_as_date_applies() const;
    bool value_as_number_applies() const;
    bool step_applies() const;
    bool step_up_or_down_applies() const;
    bool select_applies() const;
    bool selection_or_range_applies() const;
    bool selection_direction_applies() const;
    bool has_selectable_text() const;

    static bool selection_or_range_applies_for_type_state(TypeAttributeState);

    Optional<String> selection_direction_binding() { return selection_direction(); }

    // ^FormAssociatedTextControlElement
    virtual void did_edit_text_node() override;
    virtual GC::Ptr<DOM::Text> form_associated_element_to_text_node() override { return m_text_node; }

private:
    HTMLInputElement(DOM::Document&, DOM::QualifiedName);

    void type_attribute_changed(TypeAttributeState old_state, TypeAttributeState new_state);

    virtual bool is_presentational_hint(FlyString const&) const override;
    virtual void apply_presentational_hints(GC::Ref<CSS::CascadedProperties>) const override;

    // ^DOM::Node
    virtual bool is_html_input_element() const final { return true; }

    // ^DOM::EventTarget
    virtual void did_lose_focus() override;
    virtual void did_receive_focus() override;
    virtual void legacy_pre_activation_behavior() override;
    virtual void legacy_cancelled_activation_behavior() override;
    virtual void legacy_cancelled_activation_behavior_was_not_called() override;

    // ^DOM::Element
    virtual i32 default_tab_index_value() const override;
    virtual void computed_properties_changed() override;

    // https://html.spec.whatwg.org/multipage/input.html#image-button-state-(type=image):dimension-attributes
    virtual bool supports_dimension_attributes() const override { return type_state() == TypeAttributeState::ImageButton; }

    // ^Layout::ImageProvider
    virtual bool is_image_available() const override;
    virtual Optional<CSSPixels> intrinsic_width() const override;
    virtual Optional<CSSPixels> intrinsic_height() const override;
    virtual Optional<CSSPixelFraction> intrinsic_aspect_ratio() const override;
    virtual RefPtr<Gfx::ImmutableBitmap> current_image_bitmap(Gfx::IntSize = {}) const override;
    virtual void set_visible_in_viewport(bool) override;
    virtual GC::Ref<DOM::Element const> to_html_element() const override { return *this; }

    virtual void initialize(JS::Realm&) override;
    virtual void visit_edges(Cell::Visitor&) override;

    Optional<double> convert_string_to_number(StringView input) const;
    String convert_number_to_string(double input) const;

    WebIDL::ExceptionOr<GC::Ptr<JS::Date>> convert_string_to_date(StringView input) const;
    String covert_date_to_string(GC::Ref<JS::Date> input) const;

    Optional<double> min() const;
    Optional<double> max() const;
    double default_step() const;
    double step_scale_factor() const;
    Optional<double> allowed_value_step() const;
    double step_base() const;
    WebIDL::ExceptionOr<void> step_up_or_down(bool is_down, WebIDL::Long n);

    static TypeAttributeState parse_type_attribute(StringView);
    void create_shadow_tree_if_needed();
    void update_shadow_tree();
    void create_button_input_shadow_tree();
    void create_text_input_shadow_tree();
    void create_color_input_shadow_tree();
    void create_file_input_shadow_tree();
    void create_range_input_shadow_tree();
    WebIDL::ExceptionOr<void> run_input_activation_behavior(DOM::Event const&);
    void set_checked_within_group();

    void handle_maxlength_attribute();
    void handle_readonly_attribute(Optional<String> const& value);
    WebIDL::ExceptionOr<void> handle_src_attribute(String const& value);

    void user_interaction_did_change_input_value();

    // https://html.spec.whatwg.org/multipage/input.html#value-sanitization-algorithm
    String value_sanitization_algorithm(String const&) const;

    enum class ValueAttributeMode {
        Value,
        Default,
        DefaultOn,
        Filename,
    };
    static ValueAttributeMode value_attribute_mode_for_type_state(TypeAttributeState);
    ValueAttributeMode value_attribute_mode() const;

    void update_placeholder_visibility();
    GC::Ptr<DOM::Element> m_placeholder_element;
    GC::Ptr<DOM::Text> m_placeholder_text_node;

    void update_button_input_shadow_tree();

    void update_text_input_shadow_tree();
    GC::Ptr<DOM::Element> m_inner_text_element;
    GC::Ptr<DOM::Text> m_text_node;
    bool m_checked { false };

    void update_color_well_element();
    GC::Ptr<DOM::Element> m_color_well_element;

    void update_file_input_shadow_tree();
    GC::Ptr<DOM::Element> m_file_button;
    GC::Ptr<DOM::Element> m_file_label;

    void update_slider_shadow_tree_elements();
    GC::Ptr<DOM::Element> m_slider_runnable_track;
    GC::Ptr<DOM::Element> m_slider_progress_element;
    GC::Ptr<DOM::Element> m_slider_thumb;

    GC::Ptr<DecodedImageData> image_data() const;
    GC::Ptr<SharedResourceRequest> m_resource_request;
    SelectedCoordinate m_selected_coordinate;

    Optional<DOM::DocumentLoadEventDelayer> m_load_event_delayer;

    // https://html.spec.whatwg.org/multipage/input.html#dom-input-indeterminate
    bool m_indeterminate { false };

    // https://html.spec.whatwg.org/multipage/input.html#concept-input-checked-dirty-flag
    bool m_dirty_checkedness { false };

    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#concept-fe-dirty
    bool m_dirty_value { false };

    // https://html.spec.whatwg.org/multipage/input.html#the-input-element:legacy-pre-activation-behavior
    bool m_before_legacy_pre_activation_behavior_checked { false };
    bool m_before_legacy_pre_activation_behavior_indeterminate { false };
    GC::Ptr<HTMLInputElement> m_legacy_pre_activation_behavior_checked_element_in_group;

    // https://html.spec.whatwg.org/multipage/input.html#concept-input-type-file-selected
    GC::Ptr<FileAPI::FileList> m_selected_files;

    TypeAttributeState m_type { TypeAttributeState::Text };
    String m_value;

    String m_last_src_value;

    bool m_has_uncommitted_changes { false };
};

}

namespace Web::DOM {
template<>
inline bool Node::fast_is<HTML::HTMLInputElement>() const { return is_html_input_element(); }
}