// 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 { ListView } from "internal-scrollview.slint";

export component StandardTableView {
    private property <length> item-height: scroll-view.viewport-height / rows.length;
    private property <length> current-item-y: scroll-view.viewport-y + current-row * item-height;

    callback sort-ascending(column: int);
    callback sort-descending(column: int);
    callback row-pointer-event(row: int, event: PointerEvent, position: Point);
    callback current-row-changed(current-row: int);
    accessible-role: table;

    out property <int> current-sort-column: -1;
    in-out property <[TableColumn]> columns;
    in property <[[StandardListViewItem]]> rows;
    in-out property <int> current-row: -1;
    in property <bool> enabled <=> scroll-view.enabled;
    out property <length> visible-width <=> scroll-view.visible-width;
    out property <length> visible-height <=> scroll-view.visible-height;
    in-out property <bool> has-focus <=> scroll-view.has-focus;
    in-out property <length> viewport-width <=> scroll-view.viewport-width;
    in-out property <length> viewport-height <=> scroll-view.viewport-height;
    in-out property <length> viewport-x <=> scroll-view.viewport-x;
    in-out property <length> viewport-y <=> scroll-view.viewport-y;
    in property <ScrollBarPolicy> vertical-scrollbar-policy <=> scroll-view.vertical-scrollbar-policy;
    in property <ScrollBarPolicy> horizontal-scrollbar-policy <=> scroll-view.horizontal-scrollbar-policy;

    horizontal-stretch: 1;
    vertical-stretch: 1;
    forward-focus: i-focus-scope;

    public function set-current-row(index: int) {
        if(index < 0 || index >= rows.length) {
            return;
        }

        current-row = index;
        current-row-changed(current-row);

        if(current-item-y < 0) {
            scroll-view.viewport-y += 0 - current-item-y;
        }

        if(current-item-y + item-height > scroll-view.visible-height) {
            scroll-view.viewport-y -= current-item-y + item-height - scroll-view.visible-height;
        }
    }

    function sort(index: int) {
        if (current-sort-column != index) {
            columns[current-sort-column].sort-order = SortOrder.unsorted;
        }

        if(columns[index].sort-order == SortOrder.ascending) {
            columns[index].sort-order = SortOrder.descending;
            sort-descending(index);
        } else {
            columns[index].sort-order = SortOrder.ascending;
            sort-ascending(index);
        }

        current-sort-column = index;
    }

    scroll-view := ListView {
        header-height: header-layout.preferred-height;

        for row[i] in rows : Rectangle {
            width: max(row-layout.preferred-width, scroll-view.visible-width);
            row-ta := TouchArea {
                clicked => {
                    root.focus();
                    root.set-current-row(i);
                }

                pointer-event(pe) => {
                    root.row-pointer-event(i, pe, {
                        x: self.absolute-position.x + self.mouse-x - root.absolute-position.x,
                        y: self.absolute-position.y + self.mouse-y - root.absolute-position.y,
                    });
                }
            }
            row-layout := HorizontalLayout {
                for cell[index] in row : Rectangle {
                    horizontal-stretch: columns[index].horizontal-stretch;
                    min-width: max(columns[index].min-width, columns[index].width);
                    preferred-width: self.min-width;
                    max-width: (index < columns.length && columns[index].width >= 1px) ? max(columns[index].min-width, columns[index].width) : 100000px;
                    HorizontalLayout {
                        NativeStandardListViewItem {
                            is_selected: i == root.current-row;
                            item: cell;
                            index: i;
                            has-hover: row-ta.has-hover;
                            min-width: 0;
                        }
                    }
                }
            }
        }
    }

    header := Rectangle {
        clip: true;
        height: header-layout.preferred-height;
        x: scroll-view.native-padding-left;
        y: scroll-view.native-padding-top;
        width: scroll-view.visible-width;

        header-layout := HorizontalLayout {
            width: max(self.preferred-width, parent.width);
            x: scroll-view.viewport-x;
            for column[index] in columns : NativeTableHeaderSection {
                item: column;
                horizontal-stretch: column.horizontal-stretch;
                min-width: max(column.min-width, column.width);
                preferred-width: self.min-width;
                max-width: (index < columns.length && column.width >= 1px) ? max(column.min-width, column.width) : 100000px;

                TouchArea {
                    clicked => {
                        sort(index);
                    }
                }

                TouchArea {
                    width: 10px;
                    x: parent.width - self.width / 2;
                    moved => {
                        if (self.pressed) {
                            column.width = max(1px, parent.width + (self.mouse-x - self.pressed-x));
                        }
                    }
                    mouse-cursor: ew-resize;
                }
            }
        }
    }

    i-focus-scope := FocusScope {
        x: 0;
        width: 0; // Do not react on clicks

        key-pressed(event) => {
            if (event.text == Key.UpArrow) {
                root.set-current-row(root.current-row - 1);
                return accept;
            } else if (event.text == Key.DownArrow) {
                root.set-current-row(root.current-row + 1);
                return accept;
            }
            reject
        }
    }
}