import {
  Component,
  OnInit,
  Output,
  EventEmitter,
  ViewChild,
  AfterViewInit,
  ChangeDetectorRef,
  OnDestroy,
  ElementRef
} from '@angular/core';

import { ucapAnimations, DialogService } from '@ucap-webmessenger/ui';

import { NGXLogger } from 'ngx-logger';

import moment from 'moment';

import { FileUtil } from '@ucap-webmessenger/core';
import { FormGroup, FormBuilder, Validators } from '@angular/forms';
import {
  ContentType,
  CategoryType,
  MessageType
} from '@ucap-webmessenger/api-message';
import { FileUploadItem } from '@ucap-webmessenger/api';
import { UserInfo } from '@ucap-webmessenger/protocol-sync';
import {
  ScheduleSendDialogComponent,
  ScheduleSendDialogData,
  ScheduleSendDialogResult
} from '../dialogs/schedule-send.dialog.component';

const ATTR_FILE = 'UCAP_ATTR_FILE';

interface Content {
  contentType: ContentType;
  content: string | File;
}

export interface Message {
  category: CategoryType;
  type: MessageType;
  title: string;
  listOrder: ContentType[];
  textContent: { text: string }[];
  recvUserList: { userSeq: number; userName: string }[];
  files?: File[];
  fileUploadItem?: FileUploadItem;
  reservationTime?: string;
  smsYn?: boolean;
}

@Component({
  selector: 'ucap-message-write',
  templateUrl: './write.component.html',
  styleUrls: ['./write.component.scss'],
  animations: ucapAnimations
})
export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
  @Output()
  send = new EventEmitter<Message>();

  @Output()
  cancel = new EventEmitter<void>();

  @Output()
  selectReceiver = new EventEmitter<UserInfo[]>();

  @ViewChild('editor', { static: true })
  editor: ElementRef<HTMLDivElement>;

  @ViewChild('fileInput', { static: true })
  fileInput: ElementRef<HTMLInputElement>;

  messageWriteForm: FormGroup;
  attachmentList: File[];
  fileUploadItem: FileUploadItem;
  receiverList: UserInfo[] = [];

  constructor(
    private formBuilder: FormBuilder,
    private dialogService: DialogService,
    private changeDetectorRef: ChangeDetectorRef,
    private logger: NGXLogger
  ) {}

  ngOnInit() {
    this.messageWriteForm = this.formBuilder.group({
      receiverList: ['', [Validators.required]],
      title: ['', [Validators.required]]
    });
  }

  ngOnDestroy(): void {}

  ngAfterViewInit(): void {}

  onClickImage() {
    this.fileInput.nativeElement.click();
    const self = this;
    this.fileInput.nativeElement.onchange = async () => {
      const fileList: FileList = self.fileInput.nativeElement.files;

      for (let i = 0; i < fileList.length; i++) {
        const file = fileList.item(i);

        const dataUrl = await FileUtil.fromBlobToDataUrl(file);
        const img = document.createElement('img');
        img.src = dataUrl as string;
        img[ATTR_FILE] = file;
        self.insertNode(img);
      }

      self.fileInput.nativeElement.value = '';
    };
  }

  onClickAttachment() {
    this.fileInput.nativeElement.click();
    const self = this;
    this.fileInput.nativeElement.onchange = () => {
      const fileList: FileList = this.fileInput.nativeElement.files;

      if (!self.attachmentList) {
        self.attachmentList = [];
      }

      for (let i = 0; i < fileList.length; i++) {
        const file = fileList.item(i);
        self.attachmentList.push(file);
      }

      self.changeDetectorRef.detectChanges();

      self.fileInput.nativeElement.value = '';
    };
  }

  onPasteEditor(event: ClipboardEvent) {
    const text = document.createTextNode(
      event.clipboardData.getData('text/plain')
    );
    this.insertNode(text, true);

    return false;
  }

  onRemovedReceiver(receiver: UserInfo) {
    const index = this.receiverList.indexOf(receiver);

    if (index >= 0) {
      this.receiverList.splice(index, 1);
    }
  }

  onClickReceiverList() {
    this.selectReceiver.emit(this.receiverList);
  }

  onClickSend() {
    this.sendMessage();
  }

  onClickCancel() {
    this.cancel.emit();
  }

  async onClickSendSchedule() {
    const result = await this.dialogService.open<
      ScheduleSendDialogComponent,
      ScheduleSendDialogData,
      ScheduleSendDialogResult
    >(ScheduleSendDialogComponent, {
      width: '600px',
      height: '600px',
      disableClose: true,
      data: {}
    });

    if (!!result && !!result.scheduleSendDate) {
      this.sendMessage(result.scheduleSendDate);
    }
  }

  private sendMessage(reservationDate?: moment.Moment) {
    const contentList: Content[] = this.generateContent();
    if (!contentList || 0 === contentList.length) {
      return;
    }

    const listOrder: ContentType[] = [];
    const textContent: { text: string }[] = [];
    const recvUserList: { userSeq: number; userName: string }[] = [];
    const files: File[] = [];
    const title = this.messageWriteForm.get('title').value;

    contentList.forEach(v => {
      listOrder.push(v.contentType);
      switch (v.contentType) {
        case ContentType.Text:
          textContent.push({ text: v.content as string });
          break;
        case ContentType.Image:
        case ContentType.AttachFile:
          files.push(v.content as File);
          break;
        default:
          break;
      }
    });

    this.receiverList.forEach(v => {
      recvUserList.push({
        userSeq: v.seq,
        userName: v.name
      });
    });

    this.fileUploadItem = FileUploadItem.from();

    this.send.emit({
      category: CategoryType.General,
      type: !!reservationDate ? MessageType.Reservation : MessageType.Send,
      title,
      listOrder,
      textContent,
      recvUserList,
      reservationTime: !!reservationDate
        ? `${reservationDate.format('YYYY-MM-DD HH:mm')}:00`
        : undefined,
      files,
      fileUploadItem: this.fileUploadItem
    });
  }

  private generateContent(): Content[] {
    const contentList: Content[] = [];

    this.editor.nativeElement.childNodes.forEach((v, k) => {
      this.parseNode(contentList, v);
    });

    if (!!this.attachmentList && 0 < this.attachmentList.length) {
      this.attachmentList.forEach(v => {
        contentList.push({
          contentType: ContentType.AttachFile,
          content: v
        });
      });
    }

    return contentList;
  }

  private parseNode(contentList: Content[], node: ChildNode) {
    switch (node.nodeType) {
      case Node.ELEMENT_NODE:
        {
          if (0 < node.childNodes.length) {
            let prevNode: ChildNode;
            node.childNodes.forEach(v => {
              if (
                !!prevNode &&
                'IMG' === prevNode.nodeName &&
                'BR' === v.nodeName
              ) {
                prevNode = v;
                return;
              }
              prevNode = v;
              this.parseNode(contentList, v);
            });
          } else {
            if ('IMG' === node.nodeName) {
              const img: HTMLImageElement = node as HTMLImageElement;
              this.appendNode(contentList, ContentType.Image, img[ATTR_FILE]);
            } else if ('BR' === node.nodeName) {
              this.appendNode(contentList, ContentType.Text, `\n`);
            } else {
            }
          }
        }
        break;
      case Node.TEXT_NODE:
        this.appendNode(contentList, ContentType.Text, node.textContent);
        break;

      default:
        break;
    }
  }

  private appendNode(
    contentList: Content[],
    contentType: ContentType,
    content: string | File
  ) {
    const prevContent = contentList[contentList.length - 1];
    switch (contentType) {
      case ContentType.Text:
        if (!!prevContent && ContentType.Text === prevContent.contentType) {
          prevContent.content = `${prevContent.content}${content}`;
        } else {
          contentList.push({
            contentType: ContentType.Text,
            content
          });
        }
        break;
      default:
        contentList.push({ contentType, content });
        break;
    }
  }

  private insertNode(node: Node, removeSelected: boolean = false) {
    const selection: Selection = document.getSelection();
    const range: Range = selection.getRangeAt(0);

    if (removeSelected) {
      selection.empty();
    }

    range.insertNode(node);
  }
}