/* WinRT Windows.UI Implementation
 *
 * Copyright (C) 2023 Mohamad Al-Jaf
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "private.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(ui);

struct uisettings
{
    IUISettings3 IUISettings3_iface;
    LONG ref;
};

static inline struct uisettings *impl_from_IUISettings3( IUISettings3 *iface )
{
    return CONTAINING_RECORD( iface, struct uisettings, IUISettings3_iface );
}

static HRESULT WINAPI uisettings3_QueryInterface( IUISettings3 *iface, REFIID iid, void **out )
{
    struct uisettings *impl = impl_from_IUISettings3( iface );

    TRACE( "iface %p, iid %s, out %p.\n", iface, debugstr_guid( iid ), out );

    if (IsEqualGUID( iid, &IID_IUnknown ) ||
        IsEqualGUID( iid, &IID_IInspectable ) ||
        IsEqualGUID( iid, &IID_IAgileObject ) ||
        IsEqualGUID( iid, &IID_IUISettings3 ))
    {
        *out = &impl->IUISettings3_iface;
        IInspectable_AddRef( *out );
        return S_OK;
    }

    FIXME( "%s not implemented, returning E_NOINTERFACE.\n", debugstr_guid( iid ) );
    *out = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI uisettings3_AddRef( IUISettings3 *iface )
{
    struct uisettings *impl = impl_from_IUISettings3( iface );
    ULONG ref = InterlockedIncrement( &impl->ref );
    TRACE( "iface %p, ref %lu.\n", iface, ref );
    return ref;
}

static ULONG WINAPI uisettings3_Release( IUISettings3 *iface )
{
    struct uisettings *impl = impl_from_IUISettings3( iface );
    ULONG ref = InterlockedDecrement( &impl->ref );

    TRACE( "iface %p, ref %lu.\n", iface, ref );

    if (!ref) free( impl );
    return ref;
}

static HRESULT WINAPI uisettings3_GetIids( IUISettings3 *iface, ULONG *iid_count, IID **iids )
{
    FIXME( "iface %p, iid_count %p, iids %p stub!\n", iface, iid_count, iids );
    return E_NOTIMPL;
}

static HRESULT WINAPI uisettings3_GetRuntimeClassName( IUISettings3 *iface, HSTRING *class_name )
{
    FIXME( "iface %p, class_name %p stub!\n", iface, class_name );
    return E_NOTIMPL;
}

static HRESULT WINAPI uisettings3_GetTrustLevel( IUISettings3 *iface, TrustLevel *trust_level )
{
    FIXME( "iface %p, trust_level %p stub!\n", iface, trust_level );
    return E_NOTIMPL;
}

static DWORD get_app_theme(void)
{
    static const WCHAR *subkey = L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize";
    static const WCHAR *name = L"AppsUseLightTheme";
    static const HKEY root = HKEY_CURRENT_USER;
    DWORD ret = 0, len = sizeof(ret), type;
    HKEY hkey;

    if (RegOpenKeyExW( root, subkey, 0, KEY_QUERY_VALUE, &hkey )) return 1;
    if (RegQueryValueExW( hkey, name, NULL, &type, (BYTE *)&ret, &len ) || type != REG_DWORD) ret = 1;
    RegCloseKey( hkey );
    return ret;
}

static void set_color_value( BYTE a, BYTE r, BYTE g, BYTE b, Color *out )
{
    out->A = a;
    out->R = r;
    out->G = g;
    out->B = b;
}

static HRESULT WINAPI uisettings3_GetColorValue( IUISettings3 *iface, UIColorType type, Color *value )
{
    DWORD theme;

    TRACE( "iface %p, type %d, value %p.\n", iface, type, value );

    switch (type)
    {
    case UIColorType_Foreground:
    case UIColorType_Background:
        theme = get_app_theme();
        break;
    default:
        FIXME( "type %d not implemented.\n", type );
        return E_NOTIMPL;
    }

    if (type == UIColorType_Foreground)
        set_color_value( 255, theme ? 0 : 255, theme ? 0 : 255, theme ? 0 : 255, value );
    else
        set_color_value( 255, theme ? 255 : 0, theme ? 255 : 0, theme ? 255 : 0, value );

    TRACE( "Returning value.A = %d, value.R = %d, value.G = %d, value.B = %d\n", value->A, value->R, value->G, value->B );
    return S_OK;
}

static HRESULT WINAPI uisettings3_add_ColorValuesChanged( IUISettings3 *iface, ITypedEventHandler_UISettings_IInspectable *handler, EventRegistrationToken *cookie )
{
    FIXME( "iface %p, handler %p, cookie %p stub!\n", iface, handler, cookie );
    return E_NOTIMPL;
}

static HRESULT WINAPI uisettings3_remove_ColorValuesChanged( IUISettings3 *iface, EventRegistrationToken cookie )
{
    FIXME( "iface %p, cookie %#I64x stub!\n", iface, cookie.value );
    return E_NOTIMPL;
}

static const struct IUISettings3Vtbl uisettings3_vtbl =
{
    uisettings3_QueryInterface,
    uisettings3_AddRef,
    uisettings3_Release,
    /* IInspectable methods */
    uisettings3_GetIids,
    uisettings3_GetRuntimeClassName,
    uisettings3_GetTrustLevel,
    /* IUISettings3 methods */
    uisettings3_GetColorValue,
    uisettings3_add_ColorValuesChanged,
    uisettings3_remove_ColorValuesChanged,
};

struct uisettings_statics
{
    IActivationFactory IActivationFactory_iface;
    LONG ref;
};

static inline struct uisettings_statics *impl_from_IActivationFactory( IActivationFactory *iface )
{
    return CONTAINING_RECORD( iface, struct uisettings_statics, IActivationFactory_iface );
}

static HRESULT WINAPI factory_QueryInterface( IActivationFactory *iface, REFIID iid, void **out )
{
    struct uisettings_statics *impl = impl_from_IActivationFactory( iface );

    TRACE( "iface %p, iid %s, out %p.\n", iface, debugstr_guid( iid ), out );

    if (IsEqualGUID( iid, &IID_IUnknown ) ||
        IsEqualGUID( iid, &IID_IInspectable ) ||
        IsEqualGUID( iid, &IID_IActivationFactory ))
    {
        *out = &impl->IActivationFactory_iface;
        IInspectable_AddRef( *out );
        return S_OK;
    }

    FIXME( "%s not implemented, returning E_NOINTERFACE.\n", debugstr_guid( iid ) );
    *out = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI factory_AddRef( IActivationFactory *iface )
{
    struct uisettings_statics *impl = impl_from_IActivationFactory( iface );
    ULONG ref = InterlockedIncrement( &impl->ref );
    TRACE( "iface %p, ref %lu.\n", iface, ref );
    return ref;
}

static ULONG WINAPI factory_Release( IActivationFactory *iface )
{
    struct uisettings_statics *impl = impl_from_IActivationFactory( iface );
    ULONG ref = InterlockedDecrement( &impl->ref );
    TRACE( "iface %p, ref %lu.\n", iface, ref );
    return ref;
}

static HRESULT WINAPI factory_GetIids( IActivationFactory *iface, ULONG *iid_count, IID **iids )
{
    FIXME( "iface %p, iid_count %p, iids %p stub!\n", iface, iid_count, iids );
    return E_NOTIMPL;
}

static HRESULT WINAPI factory_GetRuntimeClassName( IActivationFactory *iface, HSTRING *class_name )
{
    FIXME( "iface %p, class_name %p stub!\n", iface, class_name );
    return E_NOTIMPL;
}

static HRESULT WINAPI factory_GetTrustLevel( IActivationFactory *iface, TrustLevel *trust_level )
{
    FIXME( "iface %p, trust_level %p stub!\n", iface, trust_level );
    return E_NOTIMPL;
}

static HRESULT WINAPI factory_ActivateInstance( IActivationFactory *iface, IInspectable **instance )
{
    struct uisettings *impl;

    TRACE( "iface %p, instance %p.\n", iface, instance );

    if (!(impl = calloc( 1, sizeof(*impl) )))
    {
        *instance = NULL;
        return E_OUTOFMEMORY;
    }

    impl->IUISettings3_iface.lpVtbl = &uisettings3_vtbl;
    impl->ref = 1;

    *instance = (IInspectable *)&impl->IUISettings3_iface;
    return S_OK;
}

static const struct IActivationFactoryVtbl factory_vtbl =
{
    factory_QueryInterface,
    factory_AddRef,
    factory_Release,
    /* IInspectable methods */
    factory_GetIids,
    factory_GetRuntimeClassName,
    factory_GetTrustLevel,
    /* IActivationFactory methods */
    factory_ActivateInstance,
};

static struct uisettings_statics uisettings_statics =
{
    {&factory_vtbl},
    1,
};

IActivationFactory *uisettings_factory = &uisettings_statics.IActivationFactory_iface;