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

// tslint:disable:prefer-for-of

import { AfterViewInit, ChangeDetectionStrategy, ChangeDetectorRef, Component, ElementRef, EventEmitter, forwardRef, OnDestroy, Output, ViewChild } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

import {
    AppsState,
    AssetDto,
    AssetsService,
    AuthService,
    DateTime,
    DialogModel,
    ResourceLoaderService,
    Types
} from '@app/shared/internal';

declare var tinymce: any;

export const SQX_RICH_EDITOR_CONTROL_VALUE_ACCESSOR: any = {
    provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => RichEditorComponent), multi: true
};

const ImageTypes = [
    'image/jpeg',
    'image/png',
    'image/jpg',
    'image/gif'
];

@Component({
    selector: 'sqx-rich-editor',
    styleUrls: ['./rich-editor.component.scss'],
    templateUrl: './rich-editor.component.html',
    providers: [SQX_RICH_EDITOR_CONTROL_VALUE_ACCESSOR],
    changeDetection: ChangeDetectionStrategy.OnPush
})
export class RichEditorComponent implements ControlValueAccessor, AfterViewInit, OnDestroy {
    private callChange = (v: any) => { /* NOOP */ };
    private callTouched = () => { /* NOOP */ };
    private tinyEditor: any;
    private tinyInitTimer: any;
    private value: string;
    private isDisabled = false;

    public assetsDialog = new DialogModel();

    @ViewChild('editor')
    public editor: ElementRef;

    @Output()
    public assetPluginClicked = new EventEmitter<any>();

    constructor(
        private readonly appsState: AppsState,
        private readonly assetsService: AssetsService,
        private readonly authState: AuthService,
        private readonly changeDetector: ChangeDetectorRef,
        private readonly resourceLoader: ResourceLoaderService
    ) {
    }

    public ngOnDestroy() {
        clearTimeout(this.tinyInitTimer);

        tinymce.remove(this.editor);
    }

    public ngAfterViewInit() {
        const self = this;

        this.resourceLoader.loadScript('https://cdnjs.cloudflare.com/ajax/libs/tinymce/4.9.3/tinymce.min.js').then(() => {
            tinymce.init(self.getEditorOptions());
        });
    }

    private showSelector = () => {
        this.assetsDialog.show();

        this.changeDetector.detectChanges();
    }

    private getEditorOptions() {
        const self = this;

        return {
            convert_fonts_to_spans: true,
            convert_urls: false,
            plugins: 'code image media link lists advlist paste',
            removed_menuitems: 'newdocument',
            resize: true,
            toolbar: 'undo redo | styleselect | bold italic | alignleft aligncenter | bullist numlist outdent indent | link image media | assets',

            images_upload_handler: (blob: any, success: (url: string) => void, failed: () => void) => {
                const file = new File([blob.blob()], blob.filename(), { lastModified: new Date().getTime() });

                this.assetsService.uploadFile(this.appsState.appName, file, this.authState.user!.token, DateTime.now())
                    .subscribe(asset => {
                        if (Types.is(asset, AssetDto)) {
                            success(asset.url);
                        }
                    }, () => {
                        failed();
                    });
            },

            setup: (editor: any) => {
                self.tinyEditor = editor;
                self.tinyEditor.setMode(this.isDisabled ? 'readonly' : 'design');

                self.tinyEditor.addButton('assets', {
                    onclick: this.showSelector,
                    icon: 'assets',
                    text: '',
                    tooltip: 'Insert Assets'
                });

                self.tinyEditor.on('change', () => {
                    const value = editor.getContent();

                    if (this.value !== value) {
                        this.value = value;

                        self.callChange(value);
                    }
                });

                self.tinyEditor.on('paste', (event: ClipboardEvent) => {
                    for (let i = 0; i < event.clipboardData.items.length; i++) {
                        const file = event.clipboardData.items[i].getAsFile();

                        if (file && ImageTypes.indexOf(file.type) >= 0) {
                            self.uploadFile(file);
                        }
                    }
                });

                self.tinyEditor.on('drop', (event: DragEvent) => {
                    if (event.dataTransfer) {
                        for (let i = 0; i < event.dataTransfer.files.length; i++) {
                            const file = event.dataTransfer.files.item(i);

                            if (file && ImageTypes.indexOf(file.type) >= 0) {
                                self.uploadFile(file);
                            }
                        }
                    }
                });

                self.tinyEditor.on('blur', () => {
                    self.callTouched();
                });

                self.tinyInitTimer =
                    setTimeout(() => {
                        self.tinyEditor.setContent(this.value || '');
                    }, 1000);
            },

            target: this.editor.nativeElement
        };
    }

    public writeValue(obj: any) {
        this.value = Types.isString(obj) ? obj : '';

        if (this.tinyEditor) {
            this.tinyEditor.setContent(this.value);
        }
    }

    public setDisabledState(isDisabled: boolean): void {
        this.isDisabled = isDisabled;

        if (this.tinyEditor) {
            this.tinyEditor.setMode(isDisabled ? 'readonly' : 'design');
        }
    }

    public registerOnChange(fn: any) {
        this.callChange = fn;
    }

    public registerOnTouched(fn: any) {
        this.callTouched = fn;
    }

    public insertAssets(assets: AssetDto[]) {
        let content = '';

        for (let asset of assets) {
            content += `<img src="${asset.url}" alt="${asset.fileName}" />`;
        }

        if (content.length > 0) {
            this.tinyEditor.execCommand('mceInsertContent', false, content);
        }

        this.assetsDialog.hide();
    }

    public insertFiles(files: File[]) {
        for (let file of files) {
            this.uploadFile(file);
        }
    }

    private uploadFile(file: File) {
        const uploadText = `[Uploading file...${new Date()}]`;

        this.tinyEditor.execCommand('mceInsertContent', false, uploadText);

        const replaceText = (replacement: string) => {
            const content =  this.tinyEditor.getContent().replace(uploadText, replacement);

            this.tinyEditor.setContent(content);
        };

        this.assetsService.uploadFile(this.appsState.appName, file, this.authState.user!.token, DateTime.now())
            .subscribe(asset => {
                if (Types.is(asset, AssetDto)) {
                    replaceText(`<img src="${asset.url}" alt="${asset.fileName}" />`);
                }
            }, () => {
                replaceText('FAILED');
            });
    }
}