import { Injectable } from "@angular/core";
import { Observable } from "rxjs";
import { DocumentData } from "../symbols/DocumentData";
import { HttpClient, Request, Response } from "selenium-webdriver/http";
import { encodeUriSegment } from "@angular/router/src/url_tree";

@Injectable({
	providedIn: "root"
})
export class DocumentFetchService {

	constructor(private http: HttpClient) {}

	public async fetch(unsafeId: string): Promise<DocumentData> {
		const encodedId = this.encodeId(unsafeId);
		const response: Response = await this.http.send(new Request("GET", "/documents/" + encodedId + ".md"));
		if (response.status === 200) {
			return {
				found: true,
				id: encodedId,
				content: await response.body
			};
		}
		return {
			found: false,
			id: encodedId,
			content: await this.fetchErrorContent(404)
		};
	}

	public async fetchErrorContent(errorCode: number): Promise<string> {
		if (errorCode > 0 && errorCode <= 700) {
			const response: Response = await this.http.send(new Request("GET", "/documents/" + errorCode + ".md"));
			if (response.status === 200) {
				return await response.body;
			}
		}
		return "Error " + errorCode + ".";
	}

	private encodeId(id: string): string {
		return id.split("/").map(encodeUriSegment).filter((part) => part !== "." && part !== "..").join("/");
	}
}