// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0

import { CupertinoFontSettings, CupertinoPalette, Icons, CupertinoSizeSettings } from "styling.slint";
import { MenuBorder, ListItem, FocusBorder } from "components.slint";
import { ComboBoxBase } from "../common/combobox-base.slint";
import { ScrollView } from "./scrollview.slint";

export component ComboBox {
    in property <[string]> model <=> base.model;
    in property <bool> enabled <=> base.enabled;
    out property <bool> has-focus <=> base.has-focus;
    in-out property <int> current-index <=> base.current-index;
    in-out property <string> current-value <=> base.current-value;

    callback selected <=> base.selected;

    property <brush> background: CupertinoPalette.control-background;
    property <length> popup-padding: 4px;
    property <int> visible-items: min(6, model.length);

    min-width: max(160px, layout.min-width);
    min-height: max(22px, layout.min-height);
    horizontal-stretch: 1;
    vertical-stretch: 0;
    forward-focus: base;
    accessible-role: combobox;
    accessible-enabled: root.enabled;
    accessible-expandable: true;
    accessible-expanded: base.popup-has-focus;
    accessible-value <=> root.current-value;
    accessible-action-expand => { base.show-popup(); }

    states [
        disabled when !root.enabled : {
            text.color: CupertinoPalette.foreground-secondary;
            top-icon.colorize: CupertinoPalette.foreground-secondary;
            bottom-icon.colorize: CupertinoPalette.foreground-secondary;
            root.background: CupertinoPalette.tertiary-control-background;
        }
        pressed when base.pressed : {
            root.background: CupertinoPalette.secondary-control-background;
        }
    ]

    base := ComboBoxBase {
        width: 100%;
        height: 100%;

        // Mac doesn't react on mouse wheel on the ComboBox.
        scroll-delta: 1000000px;

        show-popup => {
            popup.show();
        }
        close-popup => {
            popup.close();
        }
    }

    FocusBorder {
        x: (parent.width - self.width) / 2;
        y: (parent.height - self.height) / 2;
        width: parent.width + 6px;
        height: parent.height + 6px;
        border-radius: 8px;
        has-focus: root.has-focus;
    }

    Rectangle {
        drop-shadow-blur: 0.25px;
        drop-shadow-color: #00000066;
        drop-shadow-offset-y: 0.25px;
        border-radius: 5px;
        background: root.background;

        Rectangle {
            drop-shadow-blur: 1px;
            drop-shadow-color: #00000026;
            drop-shadow-offset-y: 1px;
            border-radius: parent.border-radius;
            background: root.background;
            border-width: 1px;
            border-color: CupertinoPalette.decent-border;
            opacity: root.enabled ? 1 : 0.5;
        }
    }

    layout := HorizontalLayout {
        y: (parent.height - self.height) / 2;
        padding-left: 8px;
        padding-right: 8px;
        padding-top: 4px;
        padding-bottom: 4px;
        spacing: 4px;

        text := Text {
            horizontal-stretch: 1;
            horizontal-alignment: left;
            vertical-alignment: center;
            font-size: CupertinoFontSettings.body.font-size;
            font-weight: CupertinoFontSettings.body.font-weight;
            color: CupertinoPalette.foreground;
            text: root.current-value;
            accessible-role: none;
        }

        VerticalLayout {
            alignment: center;

            Rectangle {
                horizontal-stretch: 0;
                min-width: 16px;
                min-height: max(self.min-width, button-layout.min-height);

                if root.enabled : Rectangle {
                    width: 100%;
                    height: 100%;
                    drop-shadow-blur: 3px;
                    drop-shadow-color: #00000066;
                    drop-shadow-offset-y: 0.5px;
                    border-radius: 4px;
                    background: CupertinoPalette.accent-background;

                    Rectangle {
                        drop-shadow-blur: 2px;
                        drop-shadow-color: #00000026;
                        drop-shadow-offset-y: 1px;
                        border-radius: parent.border-radius;
                        background: parent.background;
                    }

                    Rectangle {
                        drop-shadow-blur: 1px;
                        drop-shadow-color: #00000026;
                        drop-shadow-offset-y: 0.5px;
                        border-radius: parent.border-radius;
                        background: parent.background;
                    }

                    Rectangle {
                        border-radius: parent.border-radius;
                        background: CupertinoPalette.dimmer;
                        opacity: 0.17;
                    }
                }

                button-layout := VerticalLayout {
                    padding: 4px;
                    spacing: 4px;

                    top-icon := Image {
                        x: (parent.width - self.width) / 2;
                        colorize: CupertinoPalette.accent-foreground;
                        source: Icons.chevron-up;
                        accessible-role: none;
                    }

                    bottom-icon := Image {
                        x: (parent.width - self.width) / 2;
                        colorize: CupertinoPalette.accent-foreground;
                        source: Icons.chevron-down;
                        accessible-role: none;
                    }
                }
            }
        }
    }

    popup := PopupWindow {
        x: 0;
        y: parent.height + 6px;
        width: root.width;
        height: root.visible-items * CupertinoSizeSettings.item-height  + 2 * root.popup-padding;
        forward-focus: inner-fs;

        inner-fs := FocusScope {
            focus-changed-event => {
                base.popup-has-focus = self.has-focus;
            }
            key-pressed(event) => {
                return base.popup-key-handler(event);
            }

            MenuBorder {
                ScrollView {
                    VerticalLayout {
                        alignment: start;
                        padding: root.popup-padding;

                        for value[index] in root.model : ListItem {
                            padding-horizontal: 0;
                            item: { text: value };
                            is-selected: index == root.current-index;
                            has-hover: touch-area.has-hover;
                            pressed: touch-area.pressed;
                            pressed-x: touch-area.pressed-x;
                            pressed-y: touch-area.pressed-y;

                            touch-area := TouchArea {
                                clicked => {
                                    base.select(index);
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}