// Copyright (C) The Arvados Authors. All rights reserved.
//
// SPDX-License-Identifier: AGPL-3.0

import { Middleware } from "redux";
import actions from "../../store/data-explorer/data-explorer-action";
import { PROJECT_PANEL_ID, columns, ProjectPanelFilter } from "./project-panel";
import { groupsService } from "../../services/services";
import { RootState } from "../../store/store";
import { getDataExplorer, DataExplorerState } from "../../store/data-explorer/data-explorer-reducer";
import { resourceToDataItem, ProjectPanelItem } from "./project-panel-item";
import FilterBuilder from "../../common/api/filter-builder";
import { DataColumns } from "../../components/data-table/data-table";

export const projectPanelMiddleware: Middleware = store => next => {
    next(actions.SET_COLUMNS({ id: PROJECT_PANEL_ID, columns }));

    return action => {

        const handleProjectPanelAction = <T extends { id: string }>(handler: (data: T) => void) =>
            (data: T) => {
                next(action);
                if (data.id === PROJECT_PANEL_ID) {
                    handler(data);
                }
            };

        actions.match(action, {
            SET_PAGE: handleProjectPanelAction(() => {
                store.dispatch(actions.REQUEST_ITEMS({ id: PROJECT_PANEL_ID }));
            }),
            SET_ROWS_PER_PAGE: handleProjectPanelAction(() => {
                store.dispatch(actions.REQUEST_ITEMS({ id: PROJECT_PANEL_ID }));
            }),
            SET_FILTERS: handleProjectPanelAction(() => {
                store.dispatch(actions.RESET_PAGINATION({ id: PROJECT_PANEL_ID }));
                store.dispatch(actions.REQUEST_ITEMS({ id: PROJECT_PANEL_ID }));
            }),
            REQUEST_ITEMS: handleProjectPanelAction(() => {
                const state = store.getState() as RootState;
                const dataExplorer = getDataExplorer(state.dataExplorer, PROJECT_PANEL_ID);
                const typeColumn = columns.find(c => c.name === "Type");
                const typeFilters = getSelectedTypeFilters(dataExplorer.columns as DataColumns<ProjectPanelItem, ProjectPanelFilter>);
                if (typeFilters.length > 0) {
                    groupsService
                        .contents(state.projects.currentItemId, {
                            limit: dataExplorer.rowsPerPage,
                            offset: dataExplorer.page * dataExplorer.rowsPerPage,
                            filters: FilterBuilder.create().addIsA("uuid", typeFilters.map(f => f.type))
                        })
                        .then(response => {
                            store.dispatch(actions.SET_ITEMS({
                                id: PROJECT_PANEL_ID,
                                items: response.items.map(resourceToDataItem),
                                itemsAvailable: response.itemsAvailable,
                                page: Math.floor(response.offset / response.limit),
                                rowsPerPage: response.limit
                            }));
                        });
                } else {
                    store.dispatch(actions.SET_ITEMS({
                        id: PROJECT_PANEL_ID,
                        items: [],
                        itemsAvailable: 0,
                        page: 0,
                        rowsPerPage: dataExplorer.rowsPerPage
                    }));
                }
            }),
            default: () => next(action)
        });
    };
};

const getSelectedTypeFilters = (columns: DataColumns<ProjectPanelItem, ProjectPanelFilter>) => {
    const typeColumn = columns.find(c => c.name === "Type");
    return typeColumn && typeColumn.filters ? typeColumn.filters.filter(f => f.selected) : [];
};