import { NextRequest, NextResponse } from "next/server";
import { apiRoute } from "../../../lib/server/apiRoute";
import { submitWorkshopSignup } from "../../../lib/server/workshopSignup";
import { attachWorkshopSignupDraft } from "../../../lib/server/workshopSignupDraft";
import { readLimitedJson } from "../../../lib/server/validation/requestBody";
import { workshopSignupFromFormData } from "../../../lib/server/validation/workshopSignupSchemas";

const SCOPE = "workshop-signup.submit";

function wantsHtmlForm(request: NextRequest): boolean {
  const type = request.headers.get("content-type") ?? "";
  return (
    type.includes("application/x-www-form-urlencoded") ||
    type.includes("multipart/form-data")
  );
}

function redirectBack(
  request: NextRequest,
  status: string,
  largeOrganization: boolean,
): NextResponse {
  const url = new URL("/workshops", request.url);
  url.searchParams.set("signup", status);
  if (status === "sent") {
    url.searchParams.set("band", largeOrganization ? "large" : "standard");
  }
  url.hash = "workshop-signup";
  return NextResponse.redirect(url, 303);
}

export const POST = apiRoute(SCOPE, async (request: NextRequest, _ctx, { requestId }) => {
  const htmlForm = wantsHtmlForm(request);

  let raw: unknown;
  if (htmlForm) {
    const formData = await request.formData();
    const parsed = workshopSignupFromFormData(formData);
    raw = {
      ...parsed.values,
      company_website: parsed.honeypot,
      startedAt: parsed.startedAt,
    };
  } else {
    const parsedBody = await readLimitedJson(request);
    if (parsedBody.ok === false) return parsedBody.response;
    raw = parsedBody.value;
  }

  const result = await submitWorkshopSignup(raw, requestId);

  if (htmlForm) {
    const status =
      result.status === "unavailable" ? "failed" : result.status === "sent" ? "sent" : result.status;
    const response = redirectBack(request, status === "rate_limited" ? "failed" : status, result.largeOrganization);
    if (result.status !== "sent") {
      attachWorkshopSignupDraft(response, {
        values: result.values,
        fieldErrors: result.fieldErrors,
      });
    }
    return response;
  }

  if (result.status === "invalid") {
    return NextResponse.json(
      {
        ok: false,
        status: "invalid",
        fieldErrors: result.fieldErrors,
        values: result.values,
      },
      { status: 400 },
    );
  }

  if (result.status === "rate_limited") {
    return NextResponse.json({ ok: false, status: "rate_limited" }, { status: 429 });
  }

  if (result.status === "failed" || result.status === "unavailable") {
    return NextResponse.json({ ok: false, status: "failed" }, { status: 502 });
  }

  return NextResponse.json({
    ok: true,
    status: "sent",
    largeOrganization: result.largeOrganization,
  });
});