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

export const runtime = "nodejs";

const API = (process.env.NEXT_PUBLIC_API_BASE_URL || process.env.DIRECTUS_URL || "").replace(/\/$/, "");
const bad = (m: string, c = 400, extra?: Record<string, any>) =>
NextResponse.json(extra ? { error: m, ...extra } : { error: m }, { status: c });

function readCookie(req: Request, name: string): string | null {
    const cookie = req.headers.get("cookie") || "";
    const m = cookie.match(new RegExp(`(?:^|;\\s*)${name}=([^;]*)`));
    return m ? decodeURIComponent(m[1]) : null;
}

function jwtPayload(token: string | null): any | null {
    if (!token) return null;
    try {
        const [, payload] = token.split(".");
        if (!payload) return null;
        const json = JSON.parse(
            Buffer.from(payload.replace(/-/g, "+").replace(/_/g, "/"), "base64").toString("utf8")
        );
        return json;
    } catch {
        return null;
    }
}

async function handle(req: Request) {
    const bearer = requireBearer(req);

    const body = await req.json().catch(() => ({} as any));
    const current = String(body?.current ?? body?.current_password ?? "").trim();
    const next = String(body?.next ?? body?.new_password ?? "").trim();
    // NEW: allow client to provide identifier explicitly
    let identifier = String(body?.identifier ?? "").trim();

    if (!current || !next) return bad("Missing current and/or new password");
    if (next.length < 8) return bad("Password must be at least 8 characters");

    // 1) Prefer client-provided identifier if present
    //    (email or username — whatever your Directus login accepts)
    if (!identifier) {
        // 2) Try to read from /users/me (email or username), honoring role perms
        const meRes = await fetch(`${API}/users/me?fields=id,email,username,provider`, {
            headers: { Authorization: `Bearer ${bearer}`, Accept: "application/json" },
            cache: "no-store",
        });
        const me = await meRes.json().catch(() => ({}));
        if (meRes.ok) {
            const provider: string = me?.data?.provider ?? me?.provider ?? "local";
            if (provider !== "local") {
                return bad("Password managed by external provider", 400, { debug: `provider=${provider}` });
            }
            const email: string | undefined = me?.data?.email ?? me?.email ?? undefined;
            const username: string | undefined = me?.data?.username ?? me?.username ?? undefined;
            identifier = email || username || "";
        } else {
            // If we can’t read user fields (permissions), keep going
        }
    }

    if (!identifier) {
        // 3) Try to decode JWT in ma_at — some Directus builds include email in JWT
        const token = readCookie(req, "ma_at");
        const claims = jwtPayload(token);
        const fromJwt = (claims?.email as string) || (claims?.user?.email as string) || "";
        identifier = fromJwt?.trim() || "";
    }

    if (!identifier) {
        // Last resort: ask client to pass identifier next time
        return bad("No login identifier available for this user", 400, {
            debug: "missing email and username; pass `identifier` in request body",
        });
    }

    // 4) Verify CURRENT password by logging in with identifier
    const auth = await loginDirectus(identifier, current).catch(() => null);
    const access = auth?.access_token ?? auth?.data?.access_token;
    if (!access) {
        return bad("Current password is incorrect", 401);
    }

    // 5) Update password using ONLY the 'password' field
    const patchRes = await fetch(`${API}/users/me`, {
        method: "PATCH",
        headers: {
            Authorization: `Bearer ${bearer}`,
            "Content-Type": "application/json",
            Accept: "application/json",
        },
        body: JSON.stringify({ password: next }),
    });

    const j = await patchRes.json().catch(() => ({}));
    if (!patchRes.ok) {
        const reason =
        j?.errors?.[0]?.message || j?.error || (typeof j === "string" ? j : "") || "Password change failed";
        return bad(reason, patchRes.status);
    }

    return NextResponse.json({ ok: true });
}

export async function POST(req: Request) { return handle(req); }
export async function PATCH(req: Request) { return handle(req); }