import { HorizontalBox, VerticalBox, Palette } from "std-widgets.slint";

component SideBarItem inherits Rectangle {
    in property <int> tab-index;
    in property <bool> selected;
    in property <bool> has-focus;
    in-out property <string> text <=> label.text;

    callback clicked <=> touch.clicked;

    min-height: l.preferred-height;
    accessible-role: tab;
    accessible-label: root.text;
    accessible-item-index: root.tab-index;
    accessible-item-selectable: true;
    accessible-item-selected: root.selected;
    accessible-action-default => { self.clicked(); }

    states [
        pressed when touch.pressed : {
            state.opacity: 0.8;
        }
        hover when touch.has-hover : {
            state.opacity: 0.6;
        }
        selected when root.selected : {
            state.opacity: 1;
        }
        focused when root.has-focus : {
            state.opacity: 0.8;
        }
    ]

    state := Rectangle {
        opacity: 0;
        background: Palette.background;

        animate opacity { duration: 150ms; }
    }

    l := HorizontalBox {
        y: (parent.height - self.height) / 2;
        spacing: 0px;

        label := Text {
            vertical-alignment: center;
            accessible-role: none;
        }
    }

    touch := TouchArea {
        width: 100%;
        height: 100%;
    }
}

export component SideBar inherits Rectangle {
    in property <[string]> model: [];
    in property <string> title <=> label.text;
    out property <int> current-item: 0;
    out property <int> current-focused: fs.has-focus ? fs.focused-tab : -1; // The currently focused tab

    width: 180px;
    forward-focus: fs;
    accessible-role: tab-list;
    accessible-delegate-focus: root.current-focused >= 0 ? root.current-focused : root.current-item;
    accessible-label: root.title;
    accessible-item-count: root.model.length;

    Rectangle {
        background: Palette.background.darker(0.2);

        fs := FocusScope {
            key-pressed(event) => {
                if (event.text == "\n") {
                     root.current-item = root.current-focused;
                     return accept;
                }
                if (event.text == Key.UpArrow) {
                     self.focused-tab = Math.max(self.focused-tab - 1,  0);
                     return accept;
                }
                if (event.text == Key.DownArrow) {
                     self.focused-tab = Math.min(self.focused-tab + 1, root.model.length - 1);
                     return accept;
                }
                return reject;
            }

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

            property <int> focused-tab: 0;

            x: 0;
            width: 0; // Do not react on clicks
        }
    }

    VerticalBox {
        padding-left: 0px;
        padding-right: 0px;
        alignment: start;

        label := Text {
            font-size: 16px;
            horizontal-alignment: center;
        }

        navigation := VerticalLayout {
            alignment: start;
            vertical-stretch: 0;
            for item[index] in root.model : SideBarItem {
                clicked => { root.current-item = index; }

                tab-index: index;
                has-focus: index == root.current-focused;
                text: item;
                selected: index == root.current-item;
            }
        }

        VerticalLayout {
            bottom := VerticalBox {
                padding-top: 0px;
                padding-bottom: 0px;

                @children
             }
        }
    }
}