import { UiRadius } from "ui_radius.slint";
import { CompactButton, FontAwesomeIcons } from "common.slint";

export struct GalleryMenuItem { label: string, enabled: bool }

export component GalleryMenuButton inherits Rectangle {
    in property <string> text;
    in property <bool> primary: false;
    in property <bool> enabled: true;
    in property <bool> opens-up: false;
    in property <length> menu-width: 200px;
    in property <length> horizontal-padding: 12px;
    out property <length> preferred-button-width: ceil(button-label.preferred-width / 1px) * 1px + root.horizontal-padding * 2 + 18px;
    in property <[GalleryMenuItem]> items;
    private property <int> current-index: 0;
    callback opened;
    callback selected(int);

    height: 24px;
    forward-focus: trigger-focus;
    accessible-role: button;
    accessible-label: root.text;
    accessible-enabled: root.enabled;
    accessible-expandable: true;
    accessible-expanded: popup.is-open;
    accessible-action-default => { root.open-menu(); }
    changed enabled => { if !root.enabled { popup.close(); } }
    changed visible => { if !root.visible { popup.close(); } }

    public function close-menu() { popup.close(); }
    function open-menu() {
        if !root.enabled || root.items.length == 0 { return; }
        if popup.is-open { popup.close(); return; }
        root.opened();
        root.current-index = 0;
        popup.show();
    }
    function choose(index: int) {
        if !root.enabled || index < 0 || index >= root.items.length || !root.items[index].enabled { return; }
        popup.close();
        trigger-focus.focus();
        root.selected(index);
    }
    function handle-key(event: KeyEvent) -> EventResult {
        if !root.enabled { return reject; }
        if event.text == Key.Escape && popup.is-open {
            popup.close(); trigger-focus.focus(); return accept;
        }
        if event.text == Key.Return || event.text == " " {
            if popup.is-open { root.choose(root.current-index); } else { root.open-menu(); }
            return accept;
        }
        if event.text == Key.UpArrow || event.text == Key.DownArrow {
            if !popup.is-open { root.open-menu(); }
            else { root.current-index = clamp(root.current-index + (event.text == Key.UpArrow ? -1 : 1), 0, root.items.length - 1); }
            return accept;
        }
        return reject;
    }
    trigger-focus := FocusScope {
        enabled: root.enabled;
        key-pressed(event) => { return root.handle-key(event); }
        CompactButton {
            width: parent.width; height: parent.height;
            border-radius: UiRadius.control;
            enabled: root.enabled; primary: root.primary;
            clicked => { trigger-focus.focus(); root.open-menu(); }
        }
        button-label := Text {
            x: root.horizontal-padding; width: parent.width - root.horizontal-padding * 2 - 18px; height: parent.height;
            text: root.text; color: root.enabled ? #24272d : #8e9298;
            font-size: 11px; overflow: elide; horizontal-alignment: center; vertical-alignment: center;
        }
        Text {
            x: parent.width - root.horizontal-padding - 12px; width: 12px; height: parent.height;
            text: root.opens-up ? FontAwesomeIcons.angle-up : FontAwesomeIcons.angle-down;
            font-family: "Font Awesome 6 Free"; font-weight: 900; font-size: 9px;
            color: root.enabled ? #62666d : #8e9298;
            horizontal-alignment: center; vertical-alignment: center;
        }
    }
    popup := PopupWindow {
        x: root.width - self.width;
        y: root.opens-up ? -self.height - 4px : root.height + 4px;
        width: root.menu-width; height: root.items.length * 30px + 8px;
        close-policy: close-on-click-outside;
        forward-focus: popup-focus;
        popup-focus := FocusScope {
            key-pressed(event) => { return root.handle-key(event); }
            Rectangle {
                background: white; border-width: 1px; border-color: #c9cdd2; border-radius: UiRadius.menu;
                for item[index] in root.items: Rectangle {
                    x: 4px; y: 4px + index * 30px; width: parent.width - 8px; height: 30px;
                    border-radius: UiRadius.control;
                    background: item.enabled && index == root.current-index ? #edf4fc : transparent;
                    accessible-role: button; accessible-label: item.label; accessible-enabled: item.enabled;
                    accessible-action-default => { root.choose(index); }
                    Text {
                        x: 10px; width: parent.width - 20px; height: parent.height;
                        text: item.label; color: item.enabled ? #30343b : #92979f;
                        font-size: 12px; vertical-alignment: center;
                    }
                    TouchArea {
                        enabled: item.enabled;
                        changed has-hover => { if self.has-hover { root.current-index = index; } }
                        clicked => { root.choose(index); }
                    }
                }
            }
        }
    }
}