/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/


const {events} = require("@node-red/util")
const knownTypes = {};
const libraries = {};
const libraryPlugins = {};

// Libraries defined in the settings file. Their configurations
// cannot be modified in the editor.
let runtimeLibraries = [];

// Libraries defined by the user in the editor.
let userLibraries = [];

function init(runtime) {

    events.on("registry:plugin-added", function(id) {
        const plugin = runtime.plugins.getPlugin(id);
        if (plugin.type === "node-red-library-source") {
            libraryPlugins[plugin.id] = plugin;

            runtimeLibraries.forEach(library => {
                if (library.type === id) {
                    library.local = false;
                    libraries[library.id] = new plugin.class(library)
                    if (libraries[library.id].init) {
                        libraries[library.id].init();
                    }
                }
            })


        }
    })

    knownTypes.flows = 'node-red';

    libraries["examples"] = require("./examples");
    libraries["examples"].init(runtime);
    libraries["local"] = require("./local");
    libraries["local"].init(runtime);

    try {
        runtimeLibraries = runtime.settings.editorTheme.library.sources;
    } catch(err) {
        runtimeLibraries = [];
    }
    // userLibraries = runtime.settings.get("library")


}

function registerType(id,type) {
    // TODO: would like to enforce this, but currently the tests register the same type multiple
    //       times and have no way to remove themselves.
    // if (knownTypes.hasOwnProperty(type)) {
    //     throw new Error(`Library type '${type}' already registered by ${id}'`)
    // }
    knownTypes[type] = id;
}

function getEntry(library,type,path) {
    if (!knownTypes.hasOwnProperty(type)) {
        throw new Error(`Unknown library type '${type}'`);
    }
    if (libraries.hasOwnProperty(library)) {
        return libraries[library].getEntry(type,path);
    } else {
        throw new Error(`Unknown library '${library}'`);
    }
}
function saveEntry(library,type,path,meta,body) {
    if (!knownTypes.hasOwnProperty(type)) {
        throw new Error(`Unknown library type '${type}'`);
    }
    if (libraries.hasOwnProperty(library)) {
        if (libraries[library].saveEntry) {
            return libraries[library].saveEntry(type,path,meta,body);
        } else {
            throw new Error(`Library '${library}' is read-only`);
        }
    } else {
        throw new Error(`Unknown library '${library}'`);
    }
}

function getLibraries() {
    const libraryList = [
        {
            id: "local",
            label: "editor:library.types.local",
            user: false,
            icon: "fa fa-bath"
        },
        {
            id: "examples",
            label: "editor:library.types.examples",
            user: false,
            readOnly: true,
            types: ['flows']
        }
    ];

    for (let id in libraries) {
        if (libraries.hasOwnProperty(id)) {
            if (id !== 'local' && id !== 'examples') {
                libraryList.push({
                    id: id,
                    label: libraries[id].name || id,
                    user: false,
                    icon: libraries[id].icon
                })
            }
        }
    }

    return libraryList;

}

module.exports = {
    init: init,
    getLibraries: getLibraries,
    register: registerType,
    getEntry: getEntry,
    saveEntry: saveEntry

}