/*-
 * ========================LICENSE_START=================================
 * O-RAN-SC
 * %%
 * Copyright (C) 2019 Nordix 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.
 * ========================LICENSE_END===================================
 */

import { MatSort, Sort } from '@angular/material/sort';
import { Component, OnInit, ViewChild, Input, AfterViewInit } from '@angular/core';
import { MatDialog } from '@angular/material/dialog';
import { PolicyTypeSchema } from '@interfaces/policy.types';
import { PolicyInstanceDataSource } from './policy-instance.datasource';
import { ErrorDialogService } from '@services/ui/error-dialog.service';
import { NotificationService } from '@services/ui/notification.service';
import { PolicyService } from '@services/policy/policy.service';
import { ConfirmDialogService } from '@services/ui/confirm-dialog.service';
import { PolicyInstance } from '@interfaces/policy.types';
import { PolicyInstanceDialogComponent } from '../policy-instance-dialog/policy-instance-dialog.component';
import { getPolicyDialogProperties } from '../policy-instance-dialog/policy-instance-dialog.component';
import { HttpErrorResponse, HttpResponse } from '@angular/common/http';
import { BehaviorSubject, Observable } from 'rxjs';
import { UiService } from '@services/ui/ui.service';
import { FormControl, FormGroup } from '@angular/forms';
import { MatTableDataSource } from '@angular/material/table';

class PolicyTypeInfo {
  constructor(public type: PolicyTypeSchema) { }

  isExpanded: BehaviorSubject<boolean> = new BehaviorSubject<boolean>(false);
}

@Component({
    selector: 'nrcp-policy-instance',
    templateUrl: './policy-instance.component.html',
    styleUrls: ['./policy-instance.component.scss']
})


export class PolicyInstanceComponent implements OnInit, AfterViewInit {
    policyInstanceDataSource: PolicyInstanceDataSource;
    @Input() policyTypeSchema: PolicyTypeSchema;
    @Input() expanded: Observable<boolean>;
    @ViewChild(MatSort, { static: true }) sort: MatSort;
    policyTypeInfo = new Map<string, PolicyTypeInfo>();
    instanceDataSource: MatTableDataSource<PolicyInstance> = new MatTableDataSource<PolicyInstance>();
    policyInstanceForm: FormGroup;
    darkMode: boolean;

    constructor(
        private policySvc: PolicyService,
        private dialog: MatDialog,
        private errorDialogService: ErrorDialogService,
        private notificationService: NotificationService,
        private confirmDialogService: ConfirmDialogService,
        private ui: UiService) {
            this.policyInstanceForm = new FormGroup({
                id: new FormControl(''),
                target: new FormControl(''),
                owner: new FormControl(''),
                lastModified: new FormControl('')
            })
    }

    ngOnInit() {
        let schemaId = this.policyTypeSchema.id;
        if(schemaId.includes('<No Type>')){
            schemaId = '';
        }
        this.policyInstanceDataSource = new PolicyInstanceDataSource(this.policySvc, this.sort, this.notificationService, schemaId);
        this.expanded.subscribe((isExpanded: boolean) => this.onExpand(isExpanded));

        this.policyInstanceDataSource.connect().subscribe((data) => {
            this.instanceDataSource.data = data;
        })

        this.policyInstanceForm.valueChanges.subscribe(value => {
            const filter = {...value, id: value.id.trim().toLowerCase()} as string;
            this.instanceDataSource.filter = filter;
        });

        this.instanceDataSource.filterPredicate = ((data: PolicyInstance, filter) => {
            return this.isDataIncluding(data.policy_id, filter.id)
                && this.isDataIncluding(data.ric_id, filter.target)
                && this.isDataIncluding(data.service_id, filter.owner)
                && this.isDataIncluding(data.lastModified, filter.lastModified);
          }) as (data: PolicyInstance, filter: any) => boolean;

        this.ui.darkModeState.subscribe((isDark) => {
            this.darkMode = isDark;
        });
    }

    compare(a: any, b: any, isAsc: boolean) {
      return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
    }

    stopSort(event: any){
        event.stopPropagation();
    }

    isDataIncluding(data: string, filter: string) : boolean {
        return !filter || data.toLowerCase().includes(filter);
    }

    ngAfterViewInit() {
        this.policyInstanceDataSource.sort = this.sort;
    }

    private onExpand(isExpanded: boolean) {
        if (isExpanded) {
            this.policyInstanceDataSource.getPolicyInstances();
        }
    }

    private isSchemaEmpty(): boolean {
        return this.policyTypeSchema.schemaObject === '{}';
    }

    modifyInstance(instance: PolicyInstance): void {
        this.policySvc.getPolicyInstance(instance.policy_id).subscribe(
            (refreshedJson: any) => {
                instance = refreshedJson;
                this.dialog.open(
                    PolicyInstanceDialogComponent,
                    getPolicyDialogProperties(this.policyTypeSchema, instance, this.darkMode)).afterClosed().subscribe(
                        (_: any) => {
                            this.policyInstanceDataSource.getPolicyInstances();
                        }
                    );
            },
            (httpError: HttpErrorResponse) => {
                this.notificationService.error('Could not refresh instance. Please try again.' + httpError.message);
            }
        );
    }

    hasInstances(): boolean {
        return this.policyInstanceDataSource.rowCount > 0;
    }

    nbInstances(): number {
        return this.policyInstanceDataSource.policyInstances.length;
    }

    toLocalTime(utcTime: string): string {
        const date = new Date(utcTime);
        const toutc = date.toUTCString();
        return new Date(toutc + ' UTC').toLocaleString();

    }

    createPolicyInstance(policyTypeSchema: PolicyTypeSchema): void {
        let dialogRef = this.dialog.open(PolicyInstanceDialogComponent,
            getPolicyDialogProperties(policyTypeSchema, null, this.darkMode));
        const info: PolicyTypeInfo = this.getPolicyTypeInfo(policyTypeSchema);
        dialogRef.afterClosed().subscribe(
            (_) => {
                info.isExpanded.next(info.isExpanded.getValue());
            }
        );
    }

    deleteInstance(instance: PolicyInstance): void {
        this.confirmDialogService
            .openConfirmDialog('Are you sure you want to delete this policy instance?')
            .afterClosed().subscribe(
                (res: any) => {
                    if (res) {
                        this.policySvc.deletePolicy(instance.policy_id)
                            .subscribe(
                                (response: HttpResponse<Object>) => {
                                    switch (response.status) {
                                        case 204:
                                            this.notificationService.success('Delete succeeded!');
                                            this.policyInstanceDataSource.getPolicyInstances();
                                            break;
                                        default:
                                            this.notificationService.warn('Delete failed ' + response.status + ' ' + response.body);
                                    }
                                },
                                (error: HttpErrorResponse) => {
                                    this.errorDialogService.displayError(error.statusText + ', ' + error.error);
                                });
                    }
                });
    }

    getPolicyTypeInfo(policyTypeSchema: PolicyTypeSchema): PolicyTypeInfo {
        let info: PolicyTypeInfo = this.policyTypeInfo.get(policyTypeSchema.name);
        if (!info) {
            info = new PolicyTypeInfo(policyTypeSchema);
            this.policyTypeInfo.set(policyTypeSchema.name, info);
        }
        return info;
    }

    refreshTable() {
        this.policyInstanceDataSource.getPolicyInstances();
    }
}