const React = require('react');
const { useServices } = require('stremio/services');

const CATEGORIES = ['official', 'community', 'my'];
const DEFAULT_CATEGORY = 'community';
const DEFAULT_TYPE = 'all';

const useAddons = (category, type) => {
    const { core } = useServices();
    const [addons, setAddons] = React.useState([[], []]);
    React.useEffect(() => {
        category = CATEGORIES.includes(category) ? category : DEFAULT_CATEGORY;
        type = typeof type === 'string' && type.length > 0 ? type : DEFAULT_TYPE;
        const onNewState = () => {
            const state = core.getState();
            const onSelect = (event) => {
                const { value } = event.reactEvent.currentTarget.dataset;
                const name = event.dataset.name;
                if (name === 'category') {
                    const nextCategory = CATEGORIES.includes(value) ? value : '';
                    window.location.replace(`#/addons/${nextCategory}/${DEFAULT_TYPE}`);
                } else if (name === 'type') {
                    const nextType = typeof value === 'string' ? value : '';
                    window.location.replace(`#/addons/${category}/${nextType}`);
                }
            };
            const categoryDropdown = () => {
                const selected = CATEGORIES.includes(category) ? [category] : [];
                const options = CATEGORIES
                    .map((category) => ({ label: category, value: category }));
                return {
                    'data-name': 'category',
                    selected,
                    options,
                    onSelect
                };
            };
            const typeDropdown = () => {
                const selected = typeof type === 'string' && type.length > 0 ? [type] : [];
                const options = [...new Set(
                    [].concat.apply([],
                        ['all'].concat(
                            state.ctx.content.addons.map(addon => addon.manifest.types),
                            selected
                        )
                    ))]
                    .map((type) => ({ label: type, value: type }));
                return {
                    'data-name': 'type',
                    selected,
                    options,
                    onSelect
                };
            };
            setAddons([
                state.ctx.content.addons.filter((addon) => {
                    return (categoryDropdown().selected.join('') === 'official' ? addon.flags.official : !addon.flags.official) &&
                        (typeDropdown().selected.join('') === 'all' || addon.manifest.types.includes(typeDropdown().selected.join('')));
                }),
                [categoryDropdown(), typeDropdown()]
            ]);
        };
        core.on('NewModel', onNewState);
        onNewState();
        return () => {
            core.off('NewModel', onNewState);
        };
    }, [category, type]);
    return addons;
};

module.exports = useAddons;