import { fromJson } from "../json.js";
import { getResponseBody } from "./getResponseBody.js";

export async function getErrorResponseBody(response: Response): Promise<unknown> {
    let contentType = response.headers.get("Content-Type")?.toLowerCase();
    if (contentType == null || contentType.length === 0) {
        return getResponseBody(response);
    }

    if (contentType.indexOf(";") !== -1) {
        contentType = contentType.split(";")[0]?.trim() ?? "";
    }
    switch (contentType) {
        case "application/hal+json":
        case "application/json":
        case "application/ld+json":
        case "application/problem+json":
        case "application/vnd.api+json":
        case "text/json": {
            const text = await response.text();
            return text.length > 0 ? fromJson(text) : undefined;
        }
        default:
            if (contentType.startsWith("application/vnd.") && contentType.endsWith("+json")) {
                const text = await response.text();
                return text.length > 0 ? fromJson(text) : undefined;
            }

            // Fallback to plain text if content type is not recognized
            // Even if no body is present, the response will be an empty string
            return await response.text();
    }
}