import { NextResponse } from "next/server";
import { cookies } from "next/headers";
import {
  SESSION_COOKIE_NAME,
  type BillingCheckoutResult,
  popiartFetchEnvelope,
} from "@/lib/popiart-api";

export async function POST(request: Request) {
  const cookieStore = await cookies();
  const token = cookieStore.get(SESSION_COOKIE_NAME)?.value;

  if (!token) {
    return NextResponse.json(
      {
        ok: false,
        error: {
          code: "UNAUTHENTICATED",
          message: "missing local popiart session",
        },
      },
      { status: 401 },
    );
  }

  let body: {
    kind?: "subscription" | "points";
    provider?: string;
    plan_id?: number;
    package_id?: number;
    return_url?: string;
  } = {};

  try {
    body = (await request.json()) as typeof body;
  } catch {
    body = {};
  }

  const pathname =
    body.kind === "subscription"
      ? "/billing/checkout/subscription"
      : body.kind === "points"
        ? "/billing/checkout/points"
        : "";

  if (!pathname) {
    return NextResponse.json(
      {
        ok: false,
        error: {
          code: "VALIDATION_ERROR",
          message: "kind must be subscription or points",
        },
      },
      { status: 400 },
    );
  }

  try {
    const { response, payload } = await popiartFetchEnvelope<BillingCheckoutResult>(pathname, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Authorization: `Bearer ${token}`,
      },
      body: JSON.stringify(body),
    });

    return NextResponse.json(
      payload ?? {
        ok: false,
        error: {
          code: "SERVER_ERROR",
          message: "invalid response from popiartServer",
        },
      },
      { status: response.status },
    );
  } catch (error) {
    return NextResponse.json(
      {
        ok: false,
        error: {
          code: "SERVER_ERROR",
          message: "failed to reach popiartServer",
          details: error instanceof Error ? error.message : String(error),
        },
      },
      { status: 502 },
    );
  }
}

export async function GET(request: Request) {
  const cookieStore = await cookies();
  const token = cookieStore.get(SESSION_COOKIE_NAME)?.value;

  if (!token) {
    return NextResponse.json(
      {
        ok: false,
        error: {
          code: "UNAUTHENTICATED",
          message: "missing local popiart session",
        },
      },
      { status: 401 },
    );
  }

  const url = new URL(request.url);
  const query = new URLSearchParams(url.searchParams);

  try {
    const { response, payload } = await popiartFetchEnvelope<{
      message?: string;
      status?: string;
      data?: Record<string, unknown>;
    }>(`/billing/checkout/status?${query.toString()}`, {
      method: "GET",
      headers: {
        Authorization: `Bearer ${token}`,
      },
    });

    return NextResponse.json(
      payload ?? {
        ok: false,
        error: {
          code: "SERVER_ERROR",
          message: "invalid response from popiartServer",
        },
      },
      { status: response.status },
    );
  } catch (error) {
    return NextResponse.json(
      {
        ok: false,
        error: {
          code: "SERVER_ERROR",
          message: "failed to reach popiartServer",
          details: error instanceof Error ? error.message : String(error),
        },
      },
      { status: 502 },
    );
  }
}