// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-1.2 OR LicenseRef-Slint-commercial

import { MaterialPalette, MaterialFontSettings } from "styling.slint";

export component Ripple inherits Rectangle {
    in property <length> ripple-x;
    in property <length> ripple-y;
    in property <bool> active;
    in property <bool> has-effect;
    in property <brush> ripple-color <=> i-circle.background;

    states [
        active when root.active && root.has-effect: {
            i-circle.width: root.width * 2 * 1.4142;

            in  {
                animate i-circle.width { duration: 2s; easing: ease-out; }
            }
        }
    ]

    i-circle := Rectangle {
        x: root.ripple-x  - self.width / 2;
        y: root.ripple-y  - self.width / 2;
        height: self.width;
        border-radius: self.width  / 2;
    }
}

// A touch area that also represents a visual state.
export component StateLayer inherits TouchArea {
    in property <bool> focusable;
    in property <brush> checked-background;
    in property <brush> ripple-color;
    in property <bool> has-ripple;
    in property <length> border-radius;
    out property <bool> has-focus <=> i-focus-scope.has-focus;
    in-out property <brush> background;
    in-out property <bool> checked;

    forward-focus: i-focus-scope;

    states [
        pressed when root.pressed: {
            i-ripple.opacity: 0.12;
        }
        checked when root.checked: {
            i-ripple.opacity: 1.0;
            i-ripple.background: root.checked-background;
        }
        hover when root.has-hover: {
            i-ripple.opacity: 0.08;
        }
        focused when root.has-focus: {
            i-ripple.opacity: 0.12;
        }
    ]

    i-ripple := Ripple {
        width: 100%;
        height: 100%;
        opacity: 0;
        active: root.pressed;
        ripple-x: root.pressed-x;
        ripple-y: root.pressed-y;
        clip: true;
        border-radius: root.border-radius;
        background: root.background;
        ripple-color: root.ripple-color;
        has-effect: root.has-ripple;

        animate opacity { duration: 250ms; easing: ease; }
        animate background { duration: 250ms; }
    }

    i-focus-scope := FocusScope {
        x: 0;
        width: 0px; // Do not react on clicks
        enabled: root.enabled && root.focusable;

        key-pressed(event) => {
            if (event.text == " " || event.text == "\n") {
                 root.clicked();
                 return accept;
            }
            return reject;
        }
    }
}

// A selectable item that is used by `StandardListView` and  `ComboBox`.
export component ListItem {
    in property <StandardListViewItem> item;
    in-out property <bool> is_selected;
    in property <bool> has_hover;
    in property <bool> has_focus;
    in property <bool> pressed;
    in property <int> index;
    in property <length> pressed-x;
    in property <length> pressed-y;

    min-width: i-layout.min-width;
    min-height: max(48px, i-layout.min-height);
    vertical-stretch: 0;
    horizontal-stretch: 1;

    states [
        pressed when root.pressed: {
            i-ripple.opacity: 0.12;
        }
        checked when root.is-selected: {
            i-ripple.opacity: 1.0;
            i-ripple.background: MaterialPalette.control-background;
        }
        hover when root.has-hover: {
            i-ripple.opacity: 0.08;
        }
        focused when root.has-focus: {
            i-ripple.opacity: 0.12;
        }
    ]

    i-ripple := Ripple {
        opacity: 0;
        active: root.pressed;
        ripple-x: root.pressed-x;
        ripple-y: root.pressed-y;
        clip: true;
        border-radius: 4px;
        background: MaterialPalette.accent-background;
        ripple-color: MaterialPalette.accent-ripple;
        has-effect: true;

        animate opacity { duration: 250ms; easing: ease; }
        animate background { duration: 250ms; }
    }

    if (root.has-focus) : Rectangle {
        border-radius: 4px;
        border-width: 2px;
        border-color: MaterialPalette.accent-background;
    }

    i-layout := HorizontalLayout {
        padding-left: 12px;
        padding-right: 12px;

        label := Text {
            text: root.item.text;
            color: MaterialPalette.control-foreground;
            vertical-alignment: center;
            // FIXME after Roboto font can be loaded
            //font-family: MaterialFontSettings.label-large.font;
            font-size: MaterialFontSettings.label-large.font-size;
            font-weight: MaterialFontSettings.label-large.font-weight;
        }
    }

    @children
}
