import { Modal } from './modal';
import Cropper from 'cropperjs';

export class AvatarModal extends Modal {
  private cropper?: Cropper;
  private csrf!: string;
  private stages!: NodeListOf<HTMLElement>;
  private fileInput!: HTMLInputElement;
  private continueBtn!: HTMLElement;
  private resetBtn!: HTMLElement;
  private uploadBtn!: HTMLElement;

  private cropRoot!: HTMLImageElement;
  private previewRoot!: HTMLImageElement;
  private currentAvatar!: HTMLImageElement;

  private cropResultUrl?: string;
  private cropResultBlob?: Blob;

  private currentStep = 1;

  constructor() {
    super('avatar');
  }

  public reset(): void {
    super.reset();
    if (!this.modal) {
      return;
    }

    if (this.cropper) {
      this.cropper.destroy();
    }

    this.cropResultUrl = null;
    this.cropResultBlob = null;
    this.fileInput.value = null;
    this.previewRoot.removeAttribute('src');
    this.cropRoot.removeAttribute('src');
    this.setStep(1);
  }

  public initialize(): void {
    super.initialize();

    if (!this.modal) {
      return;
    }

    this.csrf = (document.querySelector('#csrf') as HTMLInputElement).value;
    this.stages = this.modal?.querySelectorAll(
      '[data-upload-step]',
    ) as NodeListOf<HTMLElement>;

    this.fileInput = this.modal?.querySelector(
      '#image-file',
    ) as HTMLInputElement;

    this.cropRoot = this.modal?.querySelector('#cropper') as HTMLImageElement;
    this.previewRoot = this.modal?.querySelector(
      '#crop-result',
    ) as HTMLImageElement;
    this.currentAvatar = document.querySelector(
      '#current-avatar',
    ) as HTMLImageElement;

    this.continueBtn = this.modal?.querySelector('#continue') as HTMLElement;
    this.resetBtn = this.modal?.querySelector('#reset') as HTMLElement;
    this.uploadBtn = this.modal?.querySelector('#upload') as HTMLElement;

    this.setSteps();
    this.registerEvents();
  }

  public setSteps(): void {
    this.stages?.forEach((item) => {
      const itemState = parseInt(item.getAttribute('data-upload-step'), 10);
      item.style.display = itemState === this.currentStep ? null : 'none';
    });
  }

  public setStep(index: number): void {
    this.currentStep = index;
    this.setSteps();
  }

  private startCrop(): void {
    const imgf = this.fileInput.files[0];
    if (!imgf.type.includes('image/') || imgf.type.includes('svg')) {
      // TODO: error
      return;
    }

    const reader = new FileReader();
    reader.onerror = () => {
      // TODO: error
      this.reset();
    };

    reader.onload = () => {
      this.cropRoot.src = reader.result as string;
      this.createCropper();
      this.setStep(2);
    };

    reader.readAsDataURL(imgf);
  }

  private registerEvents(): void {
    if (!this.modal) {
      return;
    }

    this.fileInput.addEventListener('change', () => {
      this.startCrop();
    });

    this.continueBtn.addEventListener('click', () => {
      this.createCropResult();
      this.setStep(3);
    });

    this.resetBtn.addEventListener('click', () => {
      if (this.cropper) {
        this.cropper.destroy();
      }
      this.fileInput.value = null;
      this.cropResultUrl = null;
      this.cropResultBlob = null;
      this.previewRoot.removeAttribute('src');
      this.setStep(1);
    });

    this.uploadBtn.addEventListener('click', () => {
      const formData = new FormData();
      formData.append('file', this.cropResultBlob);
      formData.append('_csrf', this.csrf);

      // TODO: error
      fetch('/account/avatar', {
        method: 'POST',
        body: formData,
      })
        .then((res) => res.json())
        .then((data) => {
          this.reset();
          if (data.file) {
            this.currentAvatar.src = `/uploads/${data.file}`;
          }
        });
    });
  }

  private createCropper(): void {
    this.cropper = new Cropper(this.cropRoot, {
      aspectRatio: 1,
      viewMode: 1,
      modal: false,
    });
  }

  private createCropResult(): void {
    const cropCanvas = this.cropper.getCroppedCanvas({
      maxHeight: 1024,
      maxWidth: 1024,
      imageSmoothingEnabled: true,
      imageSmoothingQuality: 'high',
    });

    this.cropResultUrl = cropCanvas.toDataURL();
    this.previewRoot.src = this.cropResultUrl;

    cropCanvas.toBlob((blob) => {
      this.cropResultBlob = blob;
      this.setStep(3);
    });
  }
}