<script>
    import { api } from '../../urls.svelte';
    import { error, yikes } from '../../warn.svelte';
    import { t }   from '../../translations.svelte';

    import LineEditor from '../../Components/LineEditor.svelte';

    let { locations, move_dragged_to = new_loc => {}, parent = null, selected = $bindable(null) } = $props();

    let show_location_form = $state(false);
    let new_location_name = $state(null);
    let highlight = $state(null);

    function drag_over(ev,location){
        ev.stopPropagation();
        ev.preventDefault();
        location.highlight = true;
        return false;
    }

    function flat(x){
        return JSON.parse(JSON.stringify(x));
    }

    async function toggleChildren(ev, location){
        ev.preventDefault();
        ev.stopPropagation();
        selected = location;
        if (location.locations) {
            delete location.locations;
        } else {
            const url = api(`stock/locations/below/${location.id}`);
            const res = await fetch(url,{credentials:'include'});
            if (res.ok){
                yikes();
                location.locations = await res.json();
            } else error(res);
        }
        return false;
    }

    function reset(){
        new_location_name = '';
    }

    function onDrop(ev, new_loc){
        ev.preventDefault();
        ev.stopPropagation();
        move_dragged_to(new_loc);
        return false;
    }

    async function onSet(new_location_name){
        const data = {
            name: new_location_name,
            parent: parent
        }
        const url = api('stock/location');
        const res = await fetch(url,{
            credentials: 'include',
            method: 'POST',
            body: JSON.stringify(data)
        });
        if (res.ok){
            yikes;
            const saved = await res.json();
            locations.push(saved);
            show_location_form = false;
            setTimeout(reset,500);
            return true;
        } else {
            error(res);
            return false;
        }
    }

    function onsubmit(ev){
        ev.preventDefault();
        ev.stopPropagation();

        const data = {
            name: new_location_name,
            parent: parent
        }
    }

    function show_loc_form(ev){
        ev.preventDefault();
        ev.stopPropagation();
        show_location_form = true;
        return false;
    }
</script>

<style>
    .highlight > span{
        background: lime;
    }
</style>

<ul>
    {#each locations as location}
    <li onclick={e => toggleChildren(e, location)}
        class="{location.locations?'expanded':'collapsed'} {location.highlight?'highlight':null}"
        ondragover={e => drag_over(e,location)}
        ondrop={e => onDrop(e,location)}
        ondragleave={e => delete location.highlight}>
        <span class="name">{location.name}</span>
        {#if location.locations}
        <svelte:self locations={location.locations} {move_dragged_to} parent={{location:location.id}} bind:selected />
        {/if}
    </li>
    {/each}
    <li>
        {#if show_location_form}
        <form {onsubmit}>
            <LineEditor simple={true} bind:value={new_location_name} {onSet} />
        </form>
        {:else}
        <a onclick={show_loc_form}>
            <span class="symbol"></span> {t('add_object',{object:t('location')})}
        </a>
        {/if}

    </li>
</ul>
<!-- <pre>{JSON.stringify(parent,null,2)}</pre> -->
