import { azureHeadersPaged } from "../../actions/core/headers";
import { escapeODataString } from "../../actions/core/guards";
import { consoleLogger } from "../../actions/core/logger";
import { relayGetData } from "../../pages/api/middleware/relayForwarding";
import { RELAY_POLICY_STRICT_LOGIN } from "../../pages/api/middleware/relayPolicyPresets";

const WELSH_LANGUAGE_CODE = 846040000;
const EMAIL_PATTERN = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

export const resolveCrmLocale = async (email) => {
    if (typeof email !== "string") return null;

    const normalizedEmail = email.trim().toLowerCase();

    if (!EMAIL_PATTERN.test(normalizedEmail)) return null;

    const queryUrl =
        "contacts?$filter=emailaddress1 eq '" +
        escapeODataString(normalizedEmail) +
        "' and statuscode eq 1&$count=true&$select=pinswg_preferredlanguage";

    try {
        const { data } = await relayGetData({
            queryUrl,
            requestOptionsBuilder: (accessToken) =>
                azureHeadersPaged(accessToken),
            relayPolicy: RELAY_POLICY_STRICT_LOGIN
        });
        const preferredLanguage = data?.value?.[0]?.pinswg_preferredlanguage;

        if (preferredLanguage === WELSH_LANGUAGE_CODE) return "cy";
        if (preferredLanguage != null) return "en";

        return null;
    } catch (error) {
        consoleLogger({
            name: "ResolveCrmLocale",
            message: "CRM locale lookup failed"
        });
        return null;
    }
};