import { NextResponse } from "next/server";
import { EterraClient } from "@/modules/parcel-sync/services/eterra-client";
import {
  createSession,
  destroySession,
  forceDestroySession,
  getSessionCredentials,
  getSessionStatus,
} from "@/modules/parcel-sync/services/session-store";
import { getEterraHealth } from "@/modules/parcel-sync/services/eterra-health";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

/**
 * GET /api/eterra/session — returns current server-side session status
 * enriched with eTerra platform health info.
 */
export async function GET() {
  const status = getSessionStatus();
  const health = getEterraHealth();
  return NextResponse.json({
    ...status,
    eterraAvailable: health.available,
    eterraMaintenance: health.maintenance,
    eterraHealthMessage: health.message,
  });
}

/**
 * POST /api/eterra/session — connect or disconnect.
 *
 * Connect:    { action: "connect", username?, password? }
 * Disconnect: { action: "disconnect", force?: boolean }
 */
export async function POST(req: Request) {
  try {
    const body = (await req.json()) as {
      action?: string;
      username?: string;
      password?: string;
      force?: boolean;
    };

    const action = body.action ?? "connect";

    if (action === "disconnect") {
      if (body.force) {
        forceDestroySession();
        return NextResponse.json({ success: true, disconnected: true });
      }
      const result = destroySession();
      if (!result.destroyed) {
        return NextResponse.json(
          { success: false, error: result.reason },
          { status: 409 },
        );
      }
      return NextResponse.json({ success: true, disconnected: true });
    }

    // Connect
    const username = (
      body.username ??
      process.env.ETERRA_USERNAME ??
      ""
    ).trim();
    const password = (
      body.password ??
      process.env.ETERRA_PASSWORD ??
      ""
    ).trim();

    if (!username || !password) {
      return NextResponse.json(
        { error: "Credențiale eTerra lipsă" },
        { status: 400 },
      );
    }

    // Block login when eTerra is in maintenance
    const health = getEterraHealth();
    if (!health.available && health.maintenance) {
      return NextResponse.json(
        {
          error:
            "eTerra este în mentenanță — conectarea este dezactivată temporar",
          maintenance: true,
        },
        { status: 503 },
      );
    }

    // Check if already connected with same credentials
    const existing = getSessionCredentials();
    if (existing && existing.username === username) {
      // Already connected — verify session is still alive by pinging
      try {
        await EterraClient.create(username, password);
        return NextResponse.json({ success: true, alreadyConnected: true });
      } catch {
        // Session expired, re-login below
      }
    }

    // Attempt login
    await EterraClient.create(username, password);
    createSession(username, password);

    return NextResponse.json({ success: true });
  } catch (error) {
    const message = error instanceof Error ? error.message : "Eroare server";
    const status = message.toLowerCase().includes("login") ? 401 : 500;
    return NextResponse.json({ error: message }, { status });
  }
}