// app/api/auth/register/route.ts
import { NextResponse } from "next/server";
import { loginDirectus } from "@/lib/directus";

export const runtime = "nodejs";

// Base URL (no trailing slash)
const API = (process.env.NEXT_PUBLIC_API_BASE_URL || process.env.DIRECTUS_URL || "").replace(/\/$/, "");
// Service token to create users / read roles
const SERVICE_TOKEN = process.env.DIRECTUS_SERVICE_TOKEN || process.env.DIRECTUS_STATIC_TOKEN || "";
// Auto login right after signup (default: true)
const AUTO_LOGIN = (process.env.SIGNUP_AUTO_LOGIN ?? "1") !== "0";
const secure = process.env.NODE_ENV === "production";

function bad(message: string, status = 400, extra: Record<string, any> = {}) {
    return NextResponse.json({ error: message, ...extra }, { status });
}

// Resolve the role id for the role named **Users**. No fallbacks.
async function getUsersRoleId(): Promise<string> {
    if (!API) throw new Error("DIRECTUS_URL / NEXT_PUBLIC_API_BASE_URL is not set");
    if (!SERVICE_TOKEN) throw new Error("DIRECTUS_SERVICE_TOKEN is not set");

    const r = await fetch(`${API}/roles?filter[name][_eq]=Users&fields=id,name&limit=1`, {
        headers: { Authorization: `Bearer ${SERVICE_TOKEN}`, Accept: "application/json" },
        cache: "no-store",
    });
    const j = await r.json().catch(() => ({}));
    if (!r.ok) {
        const reason = j?.errors?.[0]?.message || r.statusText;
        throw new Error(`Failed to query role "Users": ${reason}`);
    }
    const id = j?.data?.[0]?.id ?? j?.[0]?.id;
    if (!id) {
        throw new Error('Role "Users" not found. Create it in Directus or set DIRECTUS_SERVICE_TOKEN correctly.');
    }
    return String(id);
}

export async function POST(req: Request) {
    try {
        if (!API) return bad("Server misconfiguration: DIRECTUS_URL / NEXT_PUBLIC_API_BASE_URL is not set", 500);
        if (!SERVICE_TOKEN) {
            return bad(
                "Server misconfiguration: DIRECTUS_SERVICE_TOKEN is not set",
                500,
                { hint: "Create a service/static token in Directus Admin and set DIRECTUS_SERVICE_TOKEN." }
            );
        }

        const body = await req.json().catch(() => ({}));
        const username = String(body?.username || "").trim();
        const email = String(body?.email || "").trim().toLowerCase(); // optional
        const password = String(body?.password || "").trim();
        const first_name = String(body?.first_name || "").trim() || undefined;
        const last_name  = String(body?.last_name || "").trim() || undefined;

        if (!username) return bad("Username is required");
        if (!password || password.length < 8) return bad("Password must be at least 8 characters");

        // Only accept the "Users" role
        const roleId = await getUsersRoleId();

        // Create the user in Directus using service token
        const createPayload: Record<string, any> = {
            status: "active",   // change to "pending" if you want a verification flow
            role: roleId,
            username,
            password,
        };
        if (email) createPayload.email = email;
        if (first_name) createPayload.first_name = first_name;
        if (last_name)  createPayload.last_name  = last_name;

        const createRes = await fetch(`${API}/users`, {
            method: "POST",
            headers: {
                Authorization: `Bearer ${SERVICE_TOKEN}`,
                "Content-Type": "application/json",
                Accept: "application/json",
            },
            body: JSON.stringify(createPayload),
        });
        const createJson = await createRes.json().catch(() => ({}));

        if (!createRes.ok) {
            const reason =
            createJson?.errors?.[0]?.message ||
            createJson?.error ||
            createRes.statusText ||
            "Registration failed";
                return bad("Registration failed", createRes.status, { debug: reason });
        }

        const user = createJson?.data ?? createJson;
        const res = NextResponse.json({
            ok: true,
            user: { id: user?.id, email: user?.email, username: user?.username },
        });

        // Optional auto-login after signup
        if (AUTO_LOGIN && (email || username)) {
            try {
                // Prefer email when available; otherwise attempt username if your Directus login allows it
                const identifier = email || username;
                const auth = await loginDirectus(identifier, password);
                const access = auth?.access_token ?? auth?.data?.access_token;
                const expiresSec = auth?.expires ?? auth?.data?.expires;

                if (access) {
                    const maxAge =
                    typeof expiresSec === "number" ? Math.max(0, Math.floor(expiresSec)) : 60 * 60 * 8;
                    res.cookies.set({
                        name: "ma_at",
                        value: access,
                        httpOnly: true,
                        sameSite: "lax",
                        secure,
                        path: "/",
                        maxAge,
                    });
                }
            } catch {
                // Ignore auto-login failure; user creation succeeded.
            }
        }

        return res;
    } catch (e: any) {
        return bad(e?.message || "Registration error", e?.status || 500);
    }
}