/* 
 * Mirai. Copyright (C) 2024 Vyn
 * This file is licensed under version 3 of the GNU General Public License (GPL-3.0-only)
 * The license can be found in the LICENSE file or at https://www.gnu.org/licenses/gpl-3.0.txt
 */

import Mirai
import QtQuick

ListView {
    id: root

    function set(date) {
        selectedDate = new Date(date)
        positionViewAtIndex((selectedDate.getFullYear()) * 12 + selectedDate.getMonth(), ListView.Center) // index from month year
    }

    signal clicked(date date);
    signal reset();

    property date selectedDate: new Date()

    width: 500
	height: 100
    snapMode: ListView.SnapOneItem
    orientation: Qt.Horizontal
    clip: true

    model: 3000 * 12 // index == months since January of the year 0

    delegate: Item {
        property int year: Math.floor(index / 12)
        property int month: index % 12 // 0 January
        property int firstDay: new Date(year, month, 1).getDay() // 0 Sunday to 6 Saturday

        width: root.width
		height: root.height

        Column {
            Item { // month year header
                width: root.width
				height: root.height - grid.height

                AppText { // month year
                    anchors.centerIn: parent
                    text: ['January', 'February', 'March', 'April', 'May', 'June',
                           'July', 'August', 'September', 'October', 'November', 'December'][month] + ' ' + year
                    font {pixelSize: 0.5 * grid.cellHeight}
                }
				
				AppButton {
					text: "Remove"
					onClicked: {
						root.reset()
					}
				}
            }

            Grid { // 1 month calender
                id: grid

                width: root.width
				height: 0.875 * root.height
                property real cellWidth: width / columns;
                property real cellHeight: height / rows // width and height of each cell in the grid.

                columns: 7 // days
                rows: 7

                Repeater {
                    model: grid.columns * grid.rows // 49 cells per month

                    delegate: Rectangle { // index is 0 to 48
                        property int day: index - 7 // 0 = top left below Sunday (-7 to 41)
                        property int date: day - firstDay + 2 // 1-31

						color: internal.selected ? colorPalette.selected.filterSelected
							: mouseArea.containsMouse ? colorPalette.selected.filterHovered
							: "transparent"
                        width: grid.cellWidth; height: grid.cellHeight
                        radius: 0.02 * root.height
                        opacity: !mouseArea.pressed? 1: 0.3

						QtObject {
							id: internal
							property bool selected: new Date(year, month, date).toDateString() == selectedDate.toDateString()  &&  text.text  &&  day >= 0
						}

                        AppText {
                            id: text

                            anchors.centerIn: parent
                            font.pixelSize: 0.5 * parent.height
                            font.bold: new Date(year, month, date).toDateString() == new Date().toDateString() // today
                            text: {
                                if(day < 0)
									['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'][index] // Su-Sa
                                else if(new Date(year, month, date).getMonth() == month) 
									date // 1-31
                                else
									''
                            }
                        }

                        MouseArea {
                            id: mouseArea

                            anchors.fill: parent
                            enabled: text.text && day >= 0
							hoverEnabled: true

                            onClicked: {
                                selectedDate = new Date(year, month, date)
                                root.clicked(selectedDate)
                            }
                        }
                    }
                }
            }
        }
    }

     // Component.onCompleted: set(new Date()) // today (otherwise Jan 0000)
}