/*
 * Copyright (c) 2025-2026, Tim Flynn <trflynn89@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/Array.h>
#include <AK/Badge.h>
#include <AK/HashMap.h>
#include <AK/HashTable.h>
#include <AK/JsonValue.h>
#include <AK/Optional.h>
#include <LibHTTP/Cache/DiskCacheSettings.h>
#include <LibIPC/Forward.h>
#include <LibURL/URL.h>
#include <LibWeb/HTML/AutoplayPolicy.h>
#include <LibWebView/Autocomplete.h>
#include <LibWebView/Forward.h>
#include <LibWebView/Options.h>
#include <LibWebView/SearchEngine.h>

namespace WebView {

struct TabSettings {
    bool vertical_tabs_enabled { false };
    bool vertical_tabs_expanded { true };
    bool vertical_tabs_expand_on_hover { false };
    Optional<u16> vertical_tabs_expanded_width;
};

struct BrowsingBehavior {
    bool enable_autoscroll { true };
    bool enable_primary_paste { true };
};

struct SiteSetting {
    OrderedHashTable<String> site_filters;

protected:
    SiteSetting() = default;
};

struct AutoplaySiteSetting : public SiteSetting {
    Web::HTML::AutoplayPolicy policy { Web::HTML::AutoplayPolicy::BlockAudio };
};

struct BrowsingDataSettings {
    HTTP::DiskCacheSettings disk_cache_settings;
};

enum class GlobalPrivacyControl {
    No,
    Yes,
};

enum class ConfigVariableID : u8 {
    ShowWebContentProcessIDInTabTitle,
    ShowAdvancedDebugMenu,
    ContentBlockerListPaths,
    UseRoundedWindowCorners,
    UseServerSideWindowDecorations,

    Count,
};

struct ConfigVariableDefinition {
    ConfigVariableID id;
    StringView name;
    StringView title;
    StringView description;
    JsonValue default_value;
    Optional<JsonValue::Type> array_element_type;
};

WEBVIEW_API ReadonlySpan<ConfigVariableDefinition const> config_variable_definitions();
WEBVIEW_API Optional<ConfigVariableID> config_variable_id_from_name(StringView);

class WEBVIEW_API SettingsObserver {
public:
    explicit SettingsObserver();
    virtual ~SettingsObserver();

    virtual void new_tab_page_url_changed() { }
    virtual void tab_settings_changed() { }
    virtual void show_menu_bar_changed() { }
    virtual void show_bookmarks_bar_changed() { }
    virtual void default_zoom_level_factor_changed() { }
    virtual void zoom_per_host_changed(StringView host) { (void)host; }
    virtual void languages_changed() { }
    virtual void browsing_behavior_changed() { }
    virtual void search_engine_changed() { }
    virtual void autocomplete_engine_changed() { }
    virtual void autoplay_settings_changed() { }
    virtual void browsing_data_settings_changed() { }
    virtual void global_privacy_control_changed() { }
    virtual void dns_settings_changed() { }
    virtual void config_variable_changed(ConfigVariableID) { }
};

class WEBVIEW_API Settings {
public:
    static Settings create(Badge<Application>);

    JsonValue serialize_json() const;

    URL::URL const& new_tab_page_url() const { return m_new_tab_page_url; }
    void set_new_tab_page_url(URL::URL);

    static TabSettings parse_tab_settings(JsonValue const&);
    TabSettings const& tab_settings() const { return m_tab_settings; }
    void set_tab_settings(TabSettings);

    bool show_menu_bar() const { return m_show_menu_bar; }
    void set_show_menu_bar(bool);

    bool show_bookmarks_bar() const { return m_show_bookmarks_bar; }
    void set_show_bookmarks_bar(bool);

    double default_zoom_level_factor() const { return m_default_zoom_level_factor; }
    void set_default_zoom_level_factor(double);

    Optional<double> zoom_for_host(StringView host) const;
    void set_zoom_for_host(StringView host, double zoom_level);

    static Vector<String> parse_json_languages(JsonValue const&);
    Vector<String> const& languages() const { return m_languages; }
    void set_languages(Vector<String>);

    static BrowsingBehavior parse_browsing_behavior(JsonValue const&);
    BrowsingBehavior browsing_behavior() const;
    void set_browsing_behavior(BrowsingBehavior);

    Optional<SearchEngine> const& search_engine() const { return m_search_engine; }
    void set_search_engine(Optional<StringView> search_engine_name);

    static Optional<SearchEngine> parse_custom_search_engine(JsonValue const&);
    void add_custom_search_engine(SearchEngine);
    void remove_custom_search_engine(SearchEngine const&);

    Optional<AutocompleteEngine> const& autocomplete_engine() const { return m_autocomplete_engine; }
    void set_autocomplete_engine(Optional<StringView> autocomplete_engine_name);

    AutoplaySiteSetting const& autoplay_settings() const { return m_autoplay; }
    void set_autoplay_policy(Web::HTML::AutoplayPolicy);
    void add_autoplay_site_filter(String const&);
    void remove_autoplay_site_filter(String const&);
    void remove_all_autoplay_site_filters();

    static BrowsingDataSettings parse_browsing_data_settings(JsonValue const&);
    BrowsingDataSettings const& browsing_data_settings() const { return m_browsing_data_settings; }
    void set_browsing_data_settings(BrowsingDataSettings);

    GlobalPrivacyControl global_privacy_control() const { return m_global_privacy_control; }
    void set_global_privacy_control(GlobalPrivacyControl);

    static DNSSettings parse_dns_settings(JsonValue const&);
    DNSSettings const& dns_settings() const { return m_dns_settings; }
    void set_dns_settings(DNSSettings const&, bool override_by_command_line = false);

    JsonValue const& config_variable(ConfigVariableID) const;
    bool config_variable_as_bool(ConfigVariableID) const;
    Vector<String> config_variable_as_string_array(ConfigVariableID) const;
    void set_config_variable(ConfigVariableID, JsonValue);
    void set_config_variable(StringView name, JsonValue const&);

    static void add_observer(Badge<SettingsObserver>, SettingsObserver&);
    static void remove_observer(Badge<SettingsObserver>, SettingsObserver&);

private:
    explicit Settings(ByteString settings_path);

    void persist_settings();

    Optional<SearchEngine> find_search_engine_by_name(StringView name);

    ByteString m_settings_path;

    URL::URL m_new_tab_page_url;
    TabSettings m_tab_settings;
    bool m_show_menu_bar { false };
    bool m_show_bookmarks_bar { true };
    double m_default_zoom_level_factor { 0 };
    HashMap<String, double> m_zoom_per_host;
    Vector<String> m_languages;
    BrowsingBehavior m_browsing_behavior;
    Optional<SearchEngine> m_search_engine;
    Vector<SearchEngine> m_custom_search_engines;
    Optional<AutocompleteEngine> m_autocomplete_engine;
    AutoplaySiteSetting m_autoplay;
    BrowsingDataSettings m_browsing_data_settings;
    GlobalPrivacyControl m_global_privacy_control { GlobalPrivacyControl::No };
    DNSSettings m_dns_settings { SystemDNS() };
    bool m_dns_override_by_command_line { false };
    Array<JsonValue, static_cast<size_t>(ConfigVariableID::Count)> m_config_variables {};

    Vector<SettingsObserver&> m_observers;
};

}

namespace IPC {

template<>
WEBVIEW_API ErrorOr<void> encode(Encoder&, WebView::BrowsingBehavior const&);

template<>
WEBVIEW_API ErrorOr<WebView::BrowsingBehavior> decode(Decoder&);

}