import { Component, input, model, output, signal } from '@angular/core';
import { UiButton } from '../button/button';

/**
 * 上传头像:圆形头像预览 + 上传/删除(操作按钮复用 ui-button),
 * 读取本地文件为 dataURL;文件输入为浏览器原生能力,组件内部持有。
 */
@Component({
  selector: 'ui-upload-avatar',
  imports: [UiButton],
  templateUrl: './upload-avatar.html',
  styleUrl: './upload-avatar.scss',
})
export class UiUploadAvatar {
  /** 头像地址(dataURL 或 URL,双向绑定) */
  readonly src = model<string>('');
  /** 头像直径(px) */
  readonly size = input(80);
  /** 是否圆形 */
  readonly circle = input(true, { transform: (v: unknown) => v === true || v === 'true' });
  /** 空态图标 */
  readonly icon = input('fa-solid fa-camera');
  /** 上传成功(拿到 dataURL)时触发 */
  readonly change = output<string>();
  /** 校验通过后输出原始 File(供业务方走真实上传链路) */
  readonly changeFile = output<File>();

  protected readonly uploading = signal(false);

  protected onPick(e: Event): void {
    const input = e.currentTarget as HTMLInputElement;
    const file = input.files?.[0];
    input.value = '';
    if (!file || !file.type.startsWith('image/')) return;
    this.uploading.set(true);
    this.changeFile.emit(file);
    const reader = new FileReader();
    reader.onload = () => {
      this.uploading.set(false);
      if (typeof reader.result === 'string') {
        this.src.set(reader.result);
        this.change.emit(reader.result);
      }
    };
    reader.onerror = () => this.uploading.set(false);
    reader.readAsDataURL(file);
  }

  protected remove(): void {
    this.src.set('');
  }
}