/*
 * Squidex Headless CMS
 *
 * @license
 * Copyright (c) Squidex UG (haftungsbeschränkt). All rights reserved.
 */

import { CdkDragDrop } from '@angular/cdk/drag-drop';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, EventEmitter, Input, OnChanges, OnInit, Output, SimpleChanges } from '@angular/core';

import {
    fadeAnimation,
    LocalStoreService,
    SchemaCategory,
    SchemaDto,
    SchemasState,
    StatefulComponent
} from '@app/shared/internal';

interface State {
    // The filtered schemas.
    filtered: ReadonlyArray<SchemaDto>;

    // True when the category is open.
    isOpen?: boolean;
}

@Component({
    selector: 'sqx-schema-category',
    styleUrls: ['./schema-category.component.scss'],
    templateUrl: './schema-category.component.html',
    animations: [
        fadeAnimation
    ],
    changeDetection: ChangeDetectionStrategy.OnPush
})
export class SchemaCategoryComponent extends StatefulComponent<State> implements OnInit, OnChanges {
    @Output()
    public remove = new EventEmitter();

    @Input()
    public schemaCategory: SchemaCategory;

    @Input()
    public schemasFilter: string;

    @Input()
    public forContent: boolean;

    constructor(changeDetector: ChangeDetectorRef,
        private readonly localStore: LocalStoreService,
        private readonly schemasState: SchemasState
    ) {
        super(changeDetector, { filtered: [], isOpen: true });
    }

    public ngOnInit() {
        this.next(s => ({ ...s, isOpen: !this.localStore.getBoolean(this.configKey()) }));
    }

    public toggle() {
        this.next(s => ({ ...s, isOpen: !s.isOpen }));

        this.localStore.setBoolean(this.configKey(), !this.snapshot.isOpen);
    }

    public ngOnChanges(changes: SimpleChanges): void {
        if (changes['schemaCategory'] || changes['schemasFilter']) {
            let filtered = this.schemaCategory.schemas;

            if (this.forContent) {
                filtered = filtered.filter(x => x.canReadContents && x.isPublished);
            }

            let isOpen = false;

            if (this.schemasFilter) {
                filtered = filtered.filter(x => x.name.indexOf(this.schemasFilter) >= 0);

                isOpen = true;
            } else {
                isOpen = this.localStore.get(`schema-category.${this.schemaCategory.name}`) !== 'false';
            }

            this.next(s => ({ ...s, isOpen, filtered }));
        }
    }

    public schemaRoute(schema: SchemaDto) {
        if (schema.isSingleton && this.forContent) {
            return [schema.name, schema.id, 'history'];
        } else {
            return [schema.name];
        }
    }

    public changeCategory(drag: CdkDragDrop<any>) {
        if (drag.previousContainer !== drag.container) {
            this.schemasState.changeCategory(drag.item.data, this.schemaCategory.name);
        }
    }

    public trackBySchema(index: number, schema: SchemaDto) {
        return schema.id;
    }

    private configKey(): string {
        return `squidex.schema.category.${this.schemaCategory.name}.closed`;
    }
}