/*
exportHelper.ts - ESP3D WebUI helper file

 Copyright (c) 2021 Alexandre Aussourd. All rights reserved.
 Modified by Luc LEBOSSE 2021

 This code is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This code is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with This code; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

import { FeaturesStructure } from './formatHelper';

// Navigator extension for IE10+ compatibility
interface NavigatorWithMsSave extends Navigator {
    msSaveOrOpenBlob?: (blob: Blob, filename: string) => void;
}

// Simplified export entry
export interface ExportEntry {
    id: string;
    label: string;
    value: string;
}

// Export structure
export interface ExportStructure {
    [category: string]: {
        [subCategory: string]: ExportEntry[];
    };
}

function filterProperties(rawFeatures: FeaturesStructure): ExportStructure {
    return Object.keys(rawFeatures).reduce((acc, categoryName) => {
        const category = rawFeatures[categoryName]
        const subCategories = Object.keys(category).reduce(
            (acc, subCatName) => {
                const subCatSettings = category[subCatName].map(
                    ({ id, label, initial }) => ({ id, label, value: initial })
                )
                return { ...acc, [subCatName]: subCatSettings }
            },
            {} as { [key: string]: ExportEntry[] }
        )
        return { ...acc, [categoryName]: subCategories }
    }, {} as ExportStructure)
}

function exportFeatures(features: FeaturesStructure): void {
    const strippedFeature = filterProperties(features)
    const filename = "export.json"
    const file = new Blob([JSON.stringify(strippedFeature, null, " ")], {
        type: "application/json",
    })
    const nav = window.navigator as NavigatorWithMsSave
    if (nav.msSaveOrOpenBlob)
        // IE10+
        nav.msSaveOrOpenBlob(file, filename)
    else {
        // Others
        const a = document.createElement("a")
        const url = URL.createObjectURL(file)
        a.href = url
        a.download = filename
        document.body.appendChild(a)
        a.click()
        setTimeout(() => {
            document.body.removeChild(a)
            window.URL.revokeObjectURL(url)
        }, 0)
    }
}

export { exportFeatures }