import { Injectable } from '@angular/core';
import axios, { AxiosInstance, AxiosResponse } from 'axios';
import { environment } from 'src/environments/environment';

import { Answer } from '../enums/answer.enum';
import { Poll } from '../models/poll.model';
import { HttpClient } from '@angular/common/http';
import { Observable, Subscription } from 'rxjs';
import { ToastService } from './toast.service';
import { LoaderService } from './loader.service';
import { Stack } from '../models/stack.model';

const apiVersion = environment.api.versionToUse;
const currentApiRoutes = environment.api.version[apiVersion];
const apiBaseHref = environment.api.version[apiVersion].baseHref;

const apiEndpoints = environment.api.endpoints;

@Injectable({
	providedIn: 'root',
})
export class ApiService {
	private axiosInstance: AxiosInstance;
	private readonly pollsEndpoint = apiEndpoints.polls.name;
	private readonly answersEndpoint = apiEndpoints.polls.answers.name;
	private readonly commentsEndpoint = apiEndpoints.polls.comments.name;
	private readonly slugsEndpoint = apiEndpoints.polls.slugs.name;
	private readonly usersEndpoint = apiEndpoints.users.name;
	private readonly usersPollsEndpoint = apiEndpoints.users.polls.name;
	private readonly usersPollsSendEmailEndpoint = apiEndpoints.users.polls.sendEmail.name;
	private baseHref: string;
	private static loaderService: LoaderService;

	constructor(private http: HttpClient, private toastService: ToastService, private loaderService: LoaderService) {
		this.baseHref = apiBaseHref;

		this.axiosInstance = axios.create({ baseURL: apiBaseHref });
		this.axiosInstance.defaults.timeout = 2500;
		this.axiosInstance.defaults.headers.post['Content-Type'] = 'application/json';
		this.axiosInstance.defaults.headers.post['Accept'] = 'application/json';
		this.axiosInstance.defaults.headers.post['Charset'] = 'UTF-8';
		// this.axiosInstance.defaults.headers.post['Accept-Charset'] = 'UTF-8';
		this.axiosInstance.defaults.headers.post['Access-Control-Allow-Methods'] = 'GET, POST, PUT, DELETE, OPTIONS';
		this.axiosInstance.defaults.headers.post['Referrer-Policy'] = 'origin-when-cross-origin';
		this.axiosInstance.defaults.headers.post['Access-Control-Allow-Origin'] = '*';
		this.axiosInstance.defaults.headers.post['Allow-Origin'] = '*';
		this.axiosInstance.defaults.headers.post['Access-Control-Allow-Headers'] =
			'Origin, X-Requested-With, Content-Type, Accept';

		console.log('this.axiosInstance.defaults.headers', this.axiosInstance.defaults.headers);
	}

	//////////////////////
	// CREATE OR UPDATE //
	//////////////////////

	/////////////////////
	/**
	 * prepare headers like the charset and json type for any call to the backend
	 * @param bodyContent?
	 */
	static makeHeaders(bodyContent?: any) {
		const headerDict = {
			Charset: 'UTF-8',
			// 'Content-Type': 'application/json',
			// Accept: 'application/json',
			'Access-Control-Allow-Origin': '*',
			'Content-Type': 'application/json',
			mode: 'no-cors',
			'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
			'Access-Control-Allow-Headers': 'Accept,Accept-Language,Content-Language,Content-Type',
			// 'Access-Control-Allow-Origin': '*',
		};

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

	public async createPoll(poll: Poll): Promise<Subscription> {
		// this.loaderService.setStatus(true);
		console.log('createPoll config', poll);
		return this.axiosInstance.post(
			`${this.baseHref}${currentApiRoutes['api_new_poll']}`,
			poll,
			ApiService.makeHeaders()
		);
	}

	/**
	 * send a new vote stack
	 * @param vote_stack
	 */
	public sendNewVoteStackOfPoll(vote_stack: Stack): Promise<void> {
		// api_new_vote_stack                   POST       ANY      ANY    /api/v1/poll/{id}/answer

		console.log('vote_stack', vote_stack);
		console.log('this.baseHref', this.baseHref);
		const headers = ApiService.makeHeaders(vote_stack);
		console.log('headers', headers);
		const url = `${this.baseHref}/vote-stack/`;

		const axiosconf = {
			url,
			method: 'POST',
			body: vote_stack,
			headers,
		};

		return this.axiosInstance.post(url, vote_stack);
	}

	//////////
	// READ //

	public async createParticipation(
		pollId: string,
		choiceLabel: string,
		pseudo: string,
		response: Answer
	): Promise<string> {
		try {
			return await this.axiosInstance.post(`${this.pollsEndpoint}/${pollId}${this.answersEndpoint}`, {
				choiceLabel,
				pseudo,
				response,
			});
		} catch (error) {
			ApiService.handleError(error);
		}
	}

	public async createComment(slug: string, comment: string): Promise<string> {
		try {
			return await this.axiosInstance.post(`${this.pollsEndpoint}/${slug}${this.commentsEndpoint}`, comment);
		} catch (error) {
			ApiService.handleError(error);
		}
	}

	//////////
	public async getAllAvailablePolls(): Promise<Poll[]> {
		// TODO: used for facilities in DEV, should be removed in production
		try {
			const response: AxiosResponse<Poll[]> = await this.axiosInstance.get<Poll[]>(`${this.pollsEndpoint}`);
			return response?.data;
		} catch (error) {
			ApiService.handleError(error);
		}
	}

	public async getPollByCustomUrl(slug: string): Promise<Poll | undefined> {
		try {
			console.log('fetch API : asking for poll with custom_url=' + slug);
			const response: AxiosResponse<Poll> = await this.axiosInstance.get<Poll>(`${this.pollsEndpoint}/${slug}`);

			return response && response.data && !Array.isArray(response.data) ? response.data : undefined;
		} catch (error) {
			if (error.response?.status === 404) {
				return undefined;
			} else {
				ApiService.handleError(error);
			}
		}
	}

	public async getPollByCustomUrlWithHash(slug: string, hash: string): Promise<Poll | undefined> {
		try {
			const response: AxiosResponse<Poll> = await this.axiosInstance.get<Poll>(
				`${this.pollsEndpoint}/${slug}/pass/${hash}`
			);
			console.log('fetch API : asking for poll with custom_url=' + slug, { response });

			return response && response.data && !Array.isArray(response.data) ? response.data : undefined;
		} catch (error) {
			if (error.response?.status === 404) {
				return undefined;
			} else {
				ApiService.handleError(error);
			}
		}
	}

	public async getSlug(slug: string): Promise<boolean> {
		try {
			// TODO: scenario should be : if we can get this custom_url, it exists. if not, it doesn't. It's just a GET.
			const response: AxiosResponse = await this.axiosInstance.get(
				`${this.pollsEndpoint}${this.slugsEndpoint}/${slug}`
			);
			if (response?.status !== 404) {
				return false;
			}
		} catch (error) {
			if (error.response?.status === 404) {
				return true;
			} else {
				ApiService.handleError(error);
			}
		}
	}

	////////////
	// UPDATE //

	public async sendUpdateVoteStack(vote_stack: Stack) {
		try {
			return await this.axiosInstance.patch(
				`${this.baseHref}/vote-stack/${vote_stack.id}/token/${vote_stack.owner.modifier_token}`,
				vote_stack
			);
		} catch (error) {
			ApiService.handleError(error);
		}
	}
	public findMyPollsByEmail(email: string): Promise<any> {
		return this.axiosInstance.get<any>(`${this.baseHref}/poll/owner/${email}`);
	}
	public async updateAnswer(slug: string, choiceLabel: string, pseudo: string, answer: Answer): Promise<string> {
		try {
			return await this.axiosInstance.patch(`${this.baseHref}/${slug}${this.answersEndpoint}`, {
				choiceLabel,
				pseudo,
				answer,
			});
		} catch (error) {
			ApiService.handleError(error);
		}
	}
	////////////
	// DELETE //

	////////////

	////////////
	public async deletePoll(slug: string): Promise<boolean> {
		try {
			const response: AxiosResponse = await this.axiosInstance.delete(`${this.pollsEndpoint}/${slug}`);
			return response?.status === 204;
		} catch (error) {
			ApiService.handleError(error);
		}
	}

	public async deletePollAnswers(slug: string): Promise<boolean> {
		try {
			const response: AxiosResponse = await this.axiosInstance.delete(
				`${this.pollsEndpoint}/${slug}${this.answersEndpoint}`
			);
			return response?.status === 204;
		} catch (error) {
			ApiService.handleError(error);
		}
	}

	public async deletePollComments(slug: string): Promise<boolean> {
		try {
			const response: AxiosResponse = await this.axiosInstance.delete(
				`${this.pollsEndpoint}/${slug}${this.commentsEndpoint}`
			);
			return response?.status === 204;
		} catch (error) {
			ApiService.handleError(error);
		}
	}

	/////////////////////
	// PRIVATE METHODS //
	/////////////////////
	private static handleError(error): void {
		// this.loaderService.setStatus(true);
		if (error.response) {
			// The request was made and the server responded with a status code
			// that falls out of the range of 2xx
			console.error('Error response data', error.response.data);
			console.error('Error response status', error.response.status);
			console.error('Error response headers', error.response.headers);
		} else if (error.request) {
			// The request was made but no response was received
			// `error.request` is an instance of XMLHttpRequest in the browser and an instance of
			// http.ClientRequest in node.js
			console.log('ErrorRequest', error.request);
		} else {
			// Something happened in setting up the request that triggered an Error
			console.log('Error', error.message);
		}
		console.log(error.config);
		// this.loaderService.setStatus(false);
	}
	public ousideHandleError(error) {
		// this.loaderService.setStatus(true);
		if (error.response) {
			// The request was made and the server responded with a status code
			// that falls out of the range of 2xx
			console.error('Error response data', error.response.data);
			console.error('Error response status', error.response.status);
			console.error('Error response headers', error.response.headers);
		} else if (error.request) {
			// The request was made but no response was received
			// `error.request` is an instance of XMLHttpRequest in the browser and an instance of
			// http.ClientRequest in node.js
			console.log('ErrorRequest', error.request);
		} else {
			// Something happened in setting up the request that triggered an Error
			console.log('Error', error.message);
		}
		console.log(error.config);
		// this.loaderService.setStatus(false);
	}
}