import { PagedResult } from "../classes/pagedResult";
import { isNullOrUndefined } from "util";

export function resolverBlobToBase64<T>(data: T, field: string, aliasNameField?: string): T {
    let img: string;
    if (data && data[field]) {
        img = data[field].toString('base64');
        if (aliasNameField) {
            data[aliasNameField] = 'data:image/jpeg;base64,'.concat(img);
            delete data[field];
        } else {
            data[field] = 'data:image/jpeg;base64,'.concat(img);
        }
    }
    return data;
}

export function base64TotoFile(dataUrl: any, fileName: any): File {
    var arr = dataUrl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
    while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new File([u8arr], fileName, { type: mime });
}

export function resize(base64, maxWidth?, maxHeight?): string {

    maxWidth = maxWidth ? maxWidth : 50;
    maxHeight = maxHeight ? maxHeight : 50;

    // Create and initialize two canvas
    var canvas = document.createElement("canvas");
    var ctx = canvas.getContext("2d");
    var canvasCopy = document.createElement("canvas");
    var copyContext = canvasCopy.getContext("2d");

    // Create original image
    var img = new Image();
    img.src = base64;

    // Determine new ratio based on max size
    var ratio = 1;
    if (img.width > maxWidth)
        ratio = maxWidth / img.width;
    else if (img.height > maxHeight)
        ratio = maxHeight / img.height;

    // Draw original image in second canvas
    canvasCopy.width = img.width;
    canvasCopy.height = img.height;
    copyContext.drawImage(img, 0, 0);

    // Copy and resize second canvas to first canvas
    canvas.width = img.width * ratio;
    canvas.height = img.height * ratio;
    ctx.drawImage(canvasCopy, 0, 0, canvasCopy.width, canvasCopy.height, 0, 0, canvas.width, canvas.height);

    return canvas.toDataURL();
}

export function isInvalid(image: any): { typeNotification: string, message: string, descricao: string } | boolean {
    if (isNullOrUndefined(image)) {
        return { typeNotification: 'warn', message: 'Ops!', descricao: 'Imagem é obrigatória.' };
    }

    let lengthImg: any = (image).replace(/=/g, "").length * 0.75;
    let byteLength = parseInt(lengthImg);
    if (byteLength > 2000000) {
        return { typeNotification: 'warn', message: 'Ops!', descricao: 'A imagem excedeu o tamanho permitido, reduza a área selecionada.' };
    }

    return false;
}

export function getImage(value: any, defaultAvatar?: boolean): string {
    if (isNullOrUndefined(value)) {
        if (defaultAvatar) {
            return 'https://meristes-image.s3.amazonaws.com/meristes_commun/imagem-pessoa-avatar.png';
        } else {
            return 'https://meristes-image.s3.amazonaws.com/meristes_commun/imagem-pessoa.jpeg';
        }
    } else {
        return value;
    }
}