import { ref, onUnmounted } from 'vue';
import axios from 'axios';
import { useArrayDataStore } from 'stores/useArrayDataStore';

const arrayDataStore = useArrayDataStore();

export function useArrayData(key, userOptions) {
    if (!key) throw new Error('ArrayData: A key is required to use this composable');

    if (!arrayDataStore.get(key)) {
        arrayDataStore.set(key);
    }

    const store = arrayDataStore.get(key);
    const filter = ref({});
    const userFilter = ref({});
    const userParams = ref({});
    const hasMoreData = ref(true);
    const options = ref({
        limit: 10,
        skip: 0,
    });
    const page = ref(1);

    if (typeof userOptions === 'object') {
        Object.assign(options.value, userOptions);
    }

    // if (typeof userOptions === 'object' && userOptions.filter) {
    //     Object.assign(filter.value, userOptions.filter);
    // }
    onUnmounted(() => {
        if (arrayDataStore.get(key)) {
            arrayDataStore.clear(key);
        }
    });

    async function fetch({ append = false }) {
        if (!options.value.url) return;

        const fetchFilter = {
            order: options.value.order,
            limit: options.value.limit,
            skip: options.value.skip,
        };

        Object.assign(fetchFilter, userFilter.value);
        filter.value = fetchFilter;

        const requestOptions = { params: { filter: filter.value } };
        const response = await axios.get(options.value.url, requestOptions);

        const { limit } = filter.value;

        hasMoreData.value = response.data.length === limit;

        if (append === true) {
            for (const row of response.data) store.data.push(row);
        }

        if (append === false) {
            store.data = response.data;
        }
    }

    async function apply({ filter, params }) {
        if (filter) userFilter.value = filter;
        if (params) userParams.value = params;

        await fetch({ append: false });
    }

    async function loadMore() {
        if (!hasMoreData.value) return;

        options.value.skip = options.value.limit * (page.value - 1);
        page.value += 1;

        await fetch({ append: true });
    }

    async function refresh() {
        // TODO
    }

    return {
        fetch,
        apply,
        refresh,
        loadMore,
        store,
        hasMoreData,
    };
}