import { FrontendVariables } from "@Front/Config/VariablesFront";
import CookieService from "@Front/Services/CookieService/CookieService";
import { uuid } from "uuidv4";

export enum ContentType {
	JSON = "application/json",
	PDF = "application/pdf",
	FORM_DATA = "multipart/form-data;",
}
export default abstract class BaseApiService {
	private static baseUrl: string;
	protected readonly variables = FrontendVariables.getInstance();

	protected constructor() {
		BaseApiService.baseUrl ??=
			this.variables.BACK_API_PROTOCOL +
			this.variables.BACK_API_HOST +
			this.variables.BACK_API_ROOT_URL +
			this.variables.BACK_API_VERSION;
	}

	protected getBaseUrl(): string {
		return BaseApiService.baseUrl;
	}

	protected buildHeaders(contentType: ContentType) {
		const token = CookieService.getInstance().getCookie("leCoffreAccessToken");

		const headers = new Headers();

		if (contentType === ContentType.JSON || contentType === ContentType.PDF) {
			headers.set("Content-Type", contentType);
		}
		headers.set("Authorization", `Bearer ${token}`);
		return headers;
	}

	protected buildBody(body: { [key: string]: unknown }): string {
		return JSON.stringify(body);
	}

	protected async getRequest<T>(url: URL, token?: string, contentType?: ContentType, filename?: string) {
		const request = async () =>
			await fetch(url, {
				method: "GET",
				headers: this.buildHeaders(contentType ?? ContentType.JSON),
			});
		return this.sendRequest<T>(request, filename);
	}

	protected async postRequest<T>(url: URL, body: { [key: string]: unknown } = {}, token?: string) {
		return this.sendRequest<T>(
			async () =>
				await fetch(url, {
					method: "POST",
					headers: this.buildHeaders(ContentType.JSON),
					body: this.buildBody(body),
				}),
		);
	}

	protected async postRequestFormData<T>(url: URL, body: FormData) {
		return this.sendRequest<T>(
			async () =>
				await fetch(url, {
					method: "POST",
					headers: this.buildHeaders(ContentType.FORM_DATA),
					body,
				}),
		);
	}

	protected async putRequest<T>(url: URL, body: { [key: string]: unknown } = {}, token?: string) {
		const request = async () =>
			await fetch(url, {
				method: "PUT",
				headers: this.buildHeaders(ContentType.JSON),
				body: this.buildBody(body),
			});

		return this.sendRequest<T>(request);
	}

	protected async patchRequest<T>(url: URL, body: { [key: string]: unknown } = {}) {
		const request = async () =>
			await fetch(url, {
				method: "PATCH",
				headers: this.buildHeaders(ContentType.JSON),
				body: this.buildBody(body),
			});

		return this.sendRequest<T>(request);
	}

	protected async deleteRequest<T>(url: URL, body: { [key: string]: unknown } = {}, token?: string) {
		const request = async () =>
			await fetch(url, {
				method: "DELETE",
				headers: this.buildHeaders(ContentType.JSON),
				body: this.buildBody(body),
			});

		return this.sendRequest<T>(request);
	}

	protected async putFormDataRequest<T>(url: URL, body: FormData, token?: string) {
		const request = async () =>
			await fetch(url, {
				method: "PUT",
				headers: this.buildHeaders(ContentType.FORM_DATA),
				body,
			});

		return this.sendRequest<T>(request);
	}

	private async sendRequest<T>(request: () => Promise<Response>, filename?: string): Promise<T> {
		const response = await request();
		return this.processResponse<T>(response, request, filename);
	}

	protected async processResponse<T>(response: Response, request: () => Promise<Response>, filename?: string): Promise<T> {
		let responseContent: T;

		if (response.ok) {
			// Check the Content-Type header to determine the response type
			const contentType = response.headers.get("Content-Type");

			if (contentType && contentType.includes("application/octet-stream")) {
				// Handle PDF response
				const blob = await response.blob();
				const url = URL.createObjectURL(blob);

				const anchor = document.createElement("a");

				anchor.href = url;
				anchor.download = filename ?? `${uuid()}.pdf`;
				anchor.click();

				URL.revokeObjectURL(url);

				responseContent = {} as T;
			} else {
				// Handle JSON response
				try {
					responseContent = await response.json();
				} catch (err) {
					return Promise.reject(err);
				}
			}
		} else {
			// Handle error response
			try {
				const responseJson = await response.json();
				return Promise.reject(responseJson);
			} catch (err) {
				return Promise.reject(err);
			}
		}

		return responseContent;
	}

	protected onError(error: unknown) {
		//console.error(error);
	}
}

export interface IResponse {
	http_status: number;
}