/*!
 * @license
 * Copyright 2019 Alfresco Software, Ltd.
 *
 * 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.
 */

import { Injectable } from '@angular/core';
import { filter } from 'rxjs/operators';
import { ReplaySubject } from 'rxjs';
import { VersionInfo, RepositoryInfo } from '@alfresco/js-api';
import { DiscoveryApiService } from './discovery-api.service';

@Injectable({
    providedIn: 'root'
})
export class VersionCompatibilityService {
    private acsVersion: VersionInfo;

    acsVersionInitialized$ = new ReplaySubject();

    constructor(private discoveryApiService: DiscoveryApiService) {
        this.discoveryApiService.ecmProductInfo$
            .pipe(filter(acsInfo => !!acsInfo))
            .subscribe((acsInfo: RepositoryInfo) => this.initializeAcsVersion(acsInfo.version));
    }

    private initializeAcsVersion(acsVersion: VersionInfo) {
        this.acsVersion = acsVersion;
        this.acsVersionInitialized$.next();
    }

    getAcsVersion(): VersionInfo {
        return this.acsVersion;
    }

    isVersionSupported(requiredVersion: string): boolean {
        const parsedRequiredVersion = this.parseVersion(requiredVersion);
        const currentVersion = this.getAcsVersion();

        let versionSupported = false;

        if (currentVersion) {
            if (+currentVersion.major > +parsedRequiredVersion.major) {
                versionSupported = true;
            } else if (currentVersion.major === parsedRequiredVersion.major &&
                +currentVersion.minor > +parsedRequiredVersion.minor) {
                versionSupported = true;
            } else if (currentVersion.major === parsedRequiredVersion.major &&
                currentVersion.minor === parsedRequiredVersion.minor &&
                +currentVersion.patch >= +parsedRequiredVersion.patch) {
                versionSupported = true;
            }
        }

        return versionSupported;
    }

    private parseVersion(version: string): VersionInfo {
        const major = version.split('.')[0];
        const minor = version.split('.')[1] || '0';
        const patch = version.split('.')[2] || '0';

        return {
            major: major,
            minor: minor,
            patch: patch
        } as VersionInfo;
    }
}