// Copyright © SixtyFPS GmbH <info@slint-ui.com>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial


import { md } from "md.slint";

export TabWidgetImpl := Rectangle {
    property <length> content-x: 0;
    property <length> content-y: tabbar-preferred-height;
    property <length> content-height: height - tabbar-preferred-height;
    property <length> content-width: width;
    property <length> tabbar-x: 0;
    property <length> tabbar-y: 0;
    property <length> tabbar-height: tabbar-preferred-height;
    property <length> tabbar-width: width;

    property <length> tabbar-preferred-height;
    property <length> tabbar-preferred-width;
    property <length> content-min-height;
    property <length> content-min-width;
    property <int> current-index;
    property <int> current-focused;

    preferred-width: content-min-width;
    min-width: max(content-min-width, tabbar-preferred-width);
    preferred-height: content-min-height + tabbar-preferred-height;
    min-height: content-min-height + tabbar-preferred-height;
}

export TabImpl := Rectangle {
    property<string> title <=> label.text;
    property<bool> enabled: true;
    property<bool> has-focus: current-focused == tab-index;
    property<bool> active: tab-index == current;
    property<bool> pressed;
    property<int> current; // The currently selected tab
    property<int> current-focused; // The currently focused tab
    property<int> tab-index; // The index of this tab
    property<int> num-tabs; // The total number of tabs

    height: 48px;
    accessible-role: tab;
    accessible-label <=> title;

    container := Rectangle {  
        background: md.sys.color.surface;
    }

    state-layer := Rectangle {  
        opacity: !touch.pressed ? !touch.has-hover ? 0 : 0.08 : 0.12;
        width: 100%;
        height: 100%;
        border-radius: container.border-radius;
        background: md.sys.color.primary;
        animate opacity { duration: 250ms; easing: ease; }
     }

    layout := HorizontalLayout {  
        padding-left: 16px;
        padding-right: 16px;
        
        label := Text {
            vertical-alignment: center;
            color: !active ? md.sys.color.on-surface : md.sys.color.primary;
            // FIXME after Roboto font can be loaded
            //font-family: md.sys.typescale.title-small.font;
            font-size: md.sys.typescale.title-small.size;
            font-weight: md.sys.typescale.title-small.weight;

            animate color { duration: 250ms; easing: ease; }
        }
    }

    indicator := Rectangle {
        opacity: !active ? 0 : 1;
        width: 100%;
        height: 3px;
        y: parent.height - height;
        background: md.sys.color.primary;

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

    touch := TouchArea {
        enabled <=> root.enabled;
        clicked => {
            current = tab-index;
        }
    }
}

export TabBarImpl := Rectangle {
    // injected properties:
    property<int> current; // The currently selected tab
    property<int> current-focused: fs.has-focus ? fs.focused-tab : -1; // The currently focused tab
    property<int> num-tabs; // The total number of tabs

    HorizontalLayout {
        alignment: start;
        @children
    }

    accessible-role: tab;
    accessible-delegate-focus: current-focused >= 0 ? current-focused : current;

    fs := FocusScope {
        width: 0px; // Do not react on clicks
        property<int> focused-tab: 0;

        key-pressed(event) => {
            if (event.text == "\n") {
                 current = current-focused;
                 return accept;
            }
            if (event.text == Keys.LeftArrow) {
                 focused-tab = Math.max(focused-tab - 1,  0);
                 return accept;
            }
            if (event.text == Keys.RightArrow) {
                 focused-tab = Math.min(focused-tab + 1, num-tabs - 1);
                 return accept;
            }
            return reject;
        }

        key-released(event) => {
            if (event.text == " ") {
                 current = current-focused;
                 return accept;
            }
            return reject;
        }
    }
}


export TabWidget := TabWidget {}