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  -   This program is free software: you can redistribute it and/or modify
  -   it under the terms of the GNU Affero General Public License as published by
  -   the Free Software Foundation, either version 3 of the License, or
  -   (at your option) any later version.
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  -   but WITHOUT ANY WARRANTY; without even the implied warranty of
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<script lang="ts">
    import { Calendar } from "@components/ui/calendar";
    import { Button } from "@components/ui/button";
    import { Popover, PopoverContent, PopoverTrigger } from "$lib/components/ui/popover";
    import { ScrollArea } from "$lib/components/ui/scroll-area";
    import { CalendarIcon } from "lucide-svelte";
    import { cn } from "@components/utils";
    import type {ZonedDateTime} from "@internationalized/date";

    let {
        value = $bindable(),
        onChange
    }: {
        value: ZonedDateTime
        onChange?: ((date: ZonedDateTime | undefined) => void) | undefined
    } = $props();

    let isOpen = $state(false);

    const hours = Array.from({ length: 24 }, (_, i) => i);

    function handleDateSelect(selectedDate: ZonedDateTime) {
        if (selectedDate) {
            value = selectedDate;
            if (onChange) {
                onChange(value);
            }
        }
    }

    function handleTimeChange(type: "hour" | "minute", change: number) {
        if (change !== undefined) {
            if (type === "hour") {
                value = value.set({ hour: change });
            } else if (type === "minute") {
                value = value.set({ minute: change });
            }
            if (onChange) {
                onChange(value);
            }
        }
    }
</script>

<Popover bind:open={isOpen}>
    <PopoverTrigger>
        <Button
                variant="outline"
                class={cn(
                "w-full justify-start text-left font-normal",
                !value && "text-muted-foreground"
            )}
        >
            <CalendarIcon class="mr-2 h-4 w-4" />
            {#if value}
                {new Intl.DateTimeFormat("de-DE", {
                    day: "2-digit",
                    month: "2-digit",
                    year: "numeric",
                    hour: "2-digit",
                    minute: "2-digit",
                }).format(value.toDate())}
            {:else}
                <span>DD.MM.YYYY, hh:mm</span>
            {/if}
        </Button>
    </PopoverTrigger>

    <PopoverContent class="w-auto p-0">
        <div class="sm:flex">
            <Calendar
                    mode="single"
                    bind:value
                    onValueChange={(date) => handleDateSelect(date)}
                    initialFocus
            />
            <div class="flex flex-col sm:flex-row sm:h-[300px] divide-y sm:divide-y-0 sm:divide-x">
                <ScrollArea class="w-64 sm:w-auto">
                    <div class="flex sm:flex-col p-2">
                        {#each [...hours].reverse() as hour}
                            <Button
                                    size="icon"
                                    variant={value && value.hour === hour ? "default" : "ghost"}
                                    class="sm:w-full shrink-0 aspect-square"
                                    onclick={() => handleTimeChange("hour", hour)}
                            >
                                {hour}
                            </Button>
                        {/each}
                    </div>
                </ScrollArea>

                <ScrollArea class="w-64 sm:w-auto">
                    <div class="flex sm:flex-col p-2">
                        {#each Array.from({ length: 60 }, (_, i) => i) as minute}
                            <Button
                                    size="icon"
                                    variant={value && value.minute === minute ? "default" : "ghost"}
                                    class="sm:w-full shrink-0 aspect-square"
                                    onclick={() => handleTimeChange("minute", minute)}
                            >
                                {minute.toString().padStart(2, '0')}
                            </Button>
                        {/each}
                    </div>
                </ScrollArea>
            </div>
        </div>
    </PopoverContent>
</Popover>
