// Copyright (c) 2017 VMware, Inc. All Rights Reserved.
//
// 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 { HttpClient, HttpParams, HttpResponse } from '@angular/common/http';
import { map, catchError } from 'rxjs/operators';
import { Observable, throwError as observableThrowError } from 'rxjs';
import { User, LDAPUser } from './user';
import LDAPUsertoUser from './user';
import {
    buildHttpRequestOptionsWithObserveResponse,
    CURRENT_BASE_HREF,
    HTTP_GET_OPTIONS,
    HTTP_JSON_OPTIONS,
} from '../../../shared/units/utils';

const userMgmtEndpoint = CURRENT_BASE_HREF + '/users';
const userListSearch = CURRENT_BASE_HREF + '/users/search?';
const ldapUserEndpoint = CURRENT_BASE_HREF + '/ldap/users';

/**
 * Define related methods to handle account and session corresponding things
 *
 **
 * class SessionService
 */
@Injectable({
    providedIn: 'root',
})
export class UserService {
    constructor(private http: HttpClient) {}
    // Get paging user list
    getUserListByPaging(page: number, pageSize: number, username?: string) {
        let params = new HttpParams();
        if (page && pageSize) {
            params = params
                .set('page', page + '')
                .set('page_size', pageSize + '');
        }
        if (username) {
            params = params.set('username', username);
        }
        return this.http
            .get<HttpResponse<User[]>>(
                userMgmtEndpoint,
                buildHttpRequestOptionsWithObserveResponse(params)
            )
            .pipe(catchError(error => observableThrowError(error)));
    }
    // Handle the related exceptions
    handleError(error: any): Observable<any> {
        return observableThrowError(error);
    }

    // Get the user list
    getUsersNameList(name: string, page_size: number): Observable<User[]> {
        return this.http
            .get(
                `${userListSearch}page_size=${page_size}&username=${name}`,
                HTTP_GET_OPTIONS
            )
            .pipe(
                map(response => response as User[]),
                catchError(error => this.handleError(error))
            );
    }
    getUsers(): Observable<User[]> {
        return this.http.get(userMgmtEndpoint).pipe(
            map(
                (response: any) => {
                    return response as User[];
                },
                catchError(error => this.handleError(error))
            )
        );
    }

    // Add new user
    addUser(user: User): Observable<any> {
        return this.http
            .post(userMgmtEndpoint, JSON.stringify(user), HTTP_JSON_OPTIONS)
            .pipe(
                map(() => null),
                catchError(error => this.handleError(error))
            );
    }

    // Delete the specified user
    deleteUser(userId: number): Observable<any> {
        return this.http
            .delete(userMgmtEndpoint + '/' + userId, HTTP_JSON_OPTIONS)
            .pipe(
                map(() => null),
                catchError(error => this.handleError(error))
            );
    }

    // Update user to enable/disable the admin role
    updateUser(user: User): Observable<any> {
        return this.http
            .put(
                userMgmtEndpoint + '/' + user.user_id,
                JSON.stringify(user),
                HTTP_JSON_OPTIONS
            )
            .pipe(
                map(() => null),
                catchError(error => this.handleError(error))
            );
    }

    // Set user admin role
    updateUserRole(user: User): Observable<any> {
        return this.http
            .put(
                userMgmtEndpoint + '/' + user.user_id + '/sysadmin',
                JSON.stringify(user),
                HTTP_JSON_OPTIONS
            )
            .pipe(
                map(() => null),
                catchError(error => this.handleError(error))
            );
    }

    // admin change normal user pwd
    changePassword(
        uid: number,
        newPassword: string,
        confirmPwd: string
    ): Observable<any> {
        if (!uid || !newPassword) {
            return observableThrowError('Invalid change uid or password');
        }

        return this.http
            .put(
                userMgmtEndpoint + '/' + uid + '/password',
                {
                    old_password: newPassword,
                    new_password: confirmPwd,
                },
                HTTP_JSON_OPTIONS
            )
            .pipe(
                map(response => response),
                catchError(error => {
                    return observableThrowError(error);
                })
            );
    }

    // Get User from LDAP
    getLDAPUsers(username: string): Observable<User[]> {
        return this.http
            .get(
                `${ldapUserEndpoint}/search?username=${username}`,
                HTTP_GET_OPTIONS
            )
            .pipe(
                map(response => {
                    let ldapUser = (response as LDAPUser[]) || [];
                    return ldapUser.map(u => LDAPUsertoUser(u));
                }),
                catchError(error => this.handleError(error))
            );
    }

    importLDAPUsers(usernames: string[]): Observable<any> {
        return this.http
            .post(
                `${ldapUserEndpoint}/import`,
                JSON.stringify({ ldap_uid_list: usernames }),
                HTTP_JSON_OPTIONS
            )
            .pipe(
                map(() => null),
                catchError(err => this.handleError(err))
            );
    }
}
