/*
 * The marketing site is a static bundle. Both forms post to sitesvc, which owns
 * the contact mailer and the signup flow; the control plane is not involved.
 *
 * The base URL is baked in at build time. Contact falls back to composing an
 * email when sitesvc is not configured, so it never silently swallows what
 * someone typed. Signup has no fallback: an account cannot be created over
 * mailto, so the form says so rather than pretending.
 */

const SITE_API = (process.env.NEXT_PUBLIC_SITE_API ?? "").replace(/\/$/, "");
const FALLBACK_ADDRESS = process.env.NEXT_PUBLIC_CONTACT_EMAIL ?? "support@hostxtra.co.uk";

export type SubmitState = "idle" | "sending" | "sent" | "error";

export type SubmitResult = {
    state: SubmitState;
    /** Message to show when the submission was refused. */
    message?: string;
    /** Per-field messages, keyed by field name. */
    fields?: Record<string, string>;
};

type FieldProblem = { field: string; message: string };

async function post(url: string, payload: unknown): Promise<SubmitResult> {
    try {
        const res = await fetch(url, {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify(payload),
        });

        if (res.ok) return { state: "sent" };

        const data = await res.json().catch(() => null);
        const problems: FieldProblem[] = data?.fields ?? [];

        return {
            state: "error",
            message: data?.error ?? "That did not go through. Try again in a moment.",
            fields: Object.fromEntries(problems.map((p) => [p.field, p.message])),
        };
    } catch {
        return { state: "error", message: "We could not reach the server. Check your connection and try again." };
    }
}

export async function submitContact(fields: { name: string; email: string; servers: string; topic: string; message: string; website: string }): Promise<SubmitResult> {
    if (!SITE_API) {
        return {
            state: "error",
            message: `The contact form is not connected yet. Email ${FALLBACK_ADDRESS} directly.`,
        };
    }
    return post(`${SITE_API}/api/contact`, fields);
}

export async function submitSignup(fields: { org_name: string; email: string; password: string; website: string }): Promise<SubmitResult> {
    if (!SITE_API) {
        return {
            state: "error",
            message: `Signup is not available from here yet. Email ${FALLBACK_ADDRESS} and we will set you up.`,
        };
    }
    return post(`${SITE_API}/api/signup`, fields);
}