import { createSummitRequest } from "@/lib/summit-requests";
import type { AdminRequestRow } from "@/types/admin-submission";
import { NextResponse } from "next/server";

export const runtime = "nodejs";

const INDUSTRY_SEGMENT: Record<string, string> = {
  government: "enterprise",
  telecom: "tier1",
  cloud: "cloud",
  ai: "enterprise",
  others: "enterprise",
};

function displayDateNow(): string {
  return new Date()
    .toLocaleDateString("en-GB", { day: "2-digit", month: "short", year: "numeric" })
    .toUpperCase()
    .replace(/ /g, " ");
}

function newId(): string {
  return `V6-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
}

type RegistrationBody = {
  type: "registration";
  fullName: string;
  phone: string;
  email: string;
  company: string;
  jobTitle: string;
  industry: string;
  industryLabel?: string;
  notes: string;
};

type FeedbackBody = {
  type: "feedback";
  eventRating: string;
  venueSatisfaction: string;
  session: string;
  sessionLabel?: string;
  speakerRating: string;
  improve2027: string;
  comments: string;
  ipv6Readiness: string;
  challenge: string;
  challengeLabel?: string;
  introductions: string;
  collaboration: string[];
  collaborationLabels?: string[];
  venueRating: string;
};

function buildFeedbackNotes(b: FeedbackBody): string {
  const collab =
    b.collaborationLabels?.length ? b.collaborationLabels.join(", ") : b.collaboration.join(", ") || "—";
  const lines = [
    "Source: Event feedback",
    b.eventRating && `Overall event rating: ${b.eventRating}/5`,
    b.venueSatisfaction && `Venue & logistics satisfaction: ${b.venueSatisfaction}/5`,
    (b.sessionLabel || b.session) && `Most valuable session: ${b.sessionLabel || b.session || "—"}`,
    b.speakerRating && `Keynote rating: ${b.speakerRating}/5`,
    b.ipv6Readiness && `IPv6 readiness: ${b.ipv6Readiness}/5`,
    (b.challengeLabel || b.challenge) &&
      `Infrastructure challenge: ${b.challengeLabel || b.challenge || "—"}`,
    b.introductions && `Speaker / company introductions: ${b.introductions}`,
    `Collaboration interests: ${collab}`,
    b.venueRating && `Venue rating (HCMC): ${b.venueRating}/5`,
    b.improve2027 && `Improve for 2027: ${b.improve2027}`,
    b.comments && `Comments: ${b.comments}`,
  ];
  return lines.filter(Boolean).join("\n");
}

export async function POST(req: Request) {
  let body: unknown;
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
  }

  if (!body || typeof body !== "object" || !("type" in body)) {
    return NextResponse.json({ error: "Missing type" }, { status: 400 });
  }

  const t = (body as { type: string }).type;
  const submittedAt = new Date().toISOString().slice(0, 10);
  const displayDate = displayDateNow();

  if (t === "registration") {
    const b = body as RegistrationBody;
    const fullName = typeof b.fullName === "string" ? b.fullName.trim() : "";
    const email = typeof b.email === "string" ? b.email.trim() : "";
    if (!fullName || !email) {
      return NextResponse.json({ error: "Full name and email are required" }, { status: 400 });
    }

    const industry = typeof b.industry === "string" ? b.industry : "";
    const segment = INDUSTRY_SEGMENT[industry] ?? "enterprise";
    const industryLabel = typeof b.industryLabel === "string" ? b.industryLabel : industry;
    const noteParts = [
      typeof b.notes === "string" && b.notes.trim() ? b.notes.trim() : "",
      industryLabel ? `Industry: ${industryLabel}` : "",
    ].filter(Boolean);

    const row: AdminRequestRow = {
      id: newId(),
      submittedAt,
      displayDate,
      fullName,
      jobTitle: typeof b.jobTitle === "string" ? b.jobTitle.trim() : "",
      company: typeof b.company === "string" ? b.company.trim() : "",
      segment,
      email,
      phone: typeof b.phone === "string" ? b.phone.trim() : "",
      status: "pending",
      notes: noteParts.join("\n"),
      source: "registration",
    };

    try {
      await createSummitRequest(row);
    } catch (e: unknown) {
      const code = e && typeof e === "object" && "code" in e ? (e as { code?: number }).code : undefined;
      if (code === 11000) {
        return NextResponse.json({ error: "Duplicate submission id" }, { status: 409 });
      }
      console.error(e);
      return NextResponse.json({ error: "Could not save submission" }, { status: 500 });
    }
    return NextResponse.json({ ok: true, id: row.id });
  }

  if (t === "feedback") {
    const b = body as FeedbackBody;
    const sessionTitle =
      typeof b.sessionLabel === "string" && b.sessionLabel
        ? b.sessionLabel
        : typeof b.session === "string" && b.session
          ? b.session
          : "General";

    const row: AdminRequestRow = {
      id: newId(),
      submittedAt,
      displayDate,
      fullName: "Event feedback",
      jobTitle: sessionTitle,
      company: "—",
      segment: "enterprise",
      email: "—",
      phone: "—",
      status: "pending",
      notes: buildFeedbackNotes(b),
      source: "feedback",
    };

    try {
      await createSummitRequest(row);
    } catch (e: unknown) {
      const code = e && typeof e === "object" && "code" in e ? (e as { code?: number }).code : undefined;
      if (code === 11000) {
        return NextResponse.json({ error: "Duplicate submission id" }, { status: 409 });
      }
      console.error(e);
      return NextResponse.json({ error: "Could not save submission" }, { status: 500 });
    }
    return NextResponse.json({ ok: true, id: row.id });
  }

  return NextResponse.json({ error: "Unknown type" }, { status: 400 });
}