import { HttpHeaders } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Poll } from '../models/poll.model';
import { Comment } from '../models/comment.model';

@Injectable({
	providedIn: 'root',
})
export class PollUtilitiesService {
	// utils functions
	/**
	 * generate unique id to have a default url for future poll
	 */
	makeUuid() {
		return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
			const r = (Math.random() * 16) | 0,
				v = c == 'x' ? r : (r & 0x3) | 0x8;
			return v.toString(16);
		});
	}

	/**
	 * make a uniq custom_url for the current poll creation
	 * @param str
	 */
	makeSlug(config: Poll) {
		let str = '';
		const creation = new Date(config.creation_date);

		str =
			creation.getFullYear() +
			'_' +
			(creation.getMonth() + 1) +
			'_' +
			creation.getDate() +
			'_' +
			config.creatorPseudo +
			'_' +
			config.title;

		return this.makeSlugFromString(str);
	}

	makeSlugFromString(text: string): string {
		let str = text.replace(/^\s+|\s+$/g, ''); // trim
		str = str.toLowerCase();

		// remove accents, swap ñ for n, etc
		const from = 'àáäâèéëêìíïîòóöôùúüûñç·/_,:;';
		const to = 'aaaaeeeeiiiioooouuuunc------';
		for (let i = 0, l = from.length; i < l; i++) {
			str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
		}

		str = str
			.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
			.replace(/\s+/g, '-') // collapse whitespace and replace by -
			.replace(/-+/g, '-'); // collapse dashes

		return str;
	}

	/**
	 * prepare headers like the charset and json type for any call to the backend
	 * @param bodyContent
	 */
	makeHeaders(bodyContent?: any) {
		const headerDict = {
			Charset: 'UTF-8',
			'Content-Type': 'application/json',
			Accept: 'application/json',
			'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
			'Access-Control-Allow-Origin': '*',
		};

		return {
			headers: headerDict,
			body: bodyContent,
		};
	}

	exportCSV(poll: Poll): void {
		let rows = [];
		const now = new Date();
		const headers = [
			['export de sondage Framadate ', poll.custom_url],
			['le', now.toISOString()],
			[poll.id, poll.title, poll.custom_url, poll.creation_date],
			['pseudo'],
		];

		const listOfChoices = ['choices : '];
		poll.choices.map((choice) => {
			listOfChoices.push(choice.name);
		});
		listOfChoices.push('pseudo');

		poll.stacks.map((voteStack) => {
			const voteStackInArray = [voteStack.pseudo];
			const keysVotes = Object.keys(voteStack.votes);

			keysVotes.map((id) => {
				voteStackInArray.push(voteStack.votes[id].value ? voteStack.votes[id].value : '');
			});
			rows.push(voteStackInArray);
		});
		const headersComments = [['comments'], ['pseudo', 'text', 'creation_date']];
		const comments = [];
		poll.comments.map((item: Comment) => {
			comments.push([item.pseudo, item.text, new Date(item.created_at), '\n']);
		});
		headers.push(listOfChoices);
		rows = [headers, listOfChoices, rows, headersComments, comments];

		const convertedCsv = rows
			.map((elem) => {
				console.log('elem', elem);
				return elem
					.map((item) => {
						console.log('item', item);
						if (typeof item === typeof Array) {
							return item.join('\n');
						}
						return item;
					})
					.join('\n');
			})
			.join('\n');
		console.log('rows', rows);
		console.log('convertedCsv', convertedCsv);

		const csvContent = 'data:text/csv;charset=utf-8,' + convertedCsv;
		console.log('csvContent', csvContent);
		const encodedUri = encodeURI(csvContent);
		const link = document.createElement('a');
		link.setAttribute('href', encodedUri);
		const exportFileName =
			(poll.custom_url ? poll.custom_url : this.makeSlug(poll)) + '_export_' + new Date() + '.csv';
		link.setAttribute('download', exportFileName);
		document.body.appendChild(link); // Required for FF
		link.click(); // This will download the data file named "my_data.csv".
	}

	download(filename: string, text: string): void {
		const element = document.createElement('a');
		element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
		element.setAttribute('download', filename);

		element.style.display = 'none';
		document.body.appendChild(element);

		element.click();

		document.body.removeChild(element);
	}
}