"use server";

import { db } from "@/db";
import { forms, submissions } from "@/db/schema";
import { and, asc, count, eq, ilike, or } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { redirect } from "next/navigation";
import { requireAdmin } from "@/lib/auth/auth";
import { sanitizeHtml } from "@/lib/sanitize-html";
import { sse } from "@/lib/realtime/sse";
import { isValidDiscordWebhookUrl } from "@/lib/discord/discord-webhook-settings";

const RESPONSE_NAVIGATION_PAGE_SIZE = 50;

export async function getResponseNavigation(
  formId: string,
  page = 1,
  query = "",
) {
  await requireAdmin();
  const safeQuery = query.trim().slice(0, 100);
  const requestedPage = Number.isFinite(page) && page > 0 ? Math.floor(page) : 1;
  const where = and(
    eq(submissions.formId, formId),
    safeQuery
      ? or(
          ilike(submissions.userName, `%${safeQuery}%`),
          ilike(submissions.userDiscordId, `%${safeQuery}%`),
        )
      : undefined,
  );
  const [{ total }] = await db
    .select({ total: count() })
    .from(submissions)
    .where(where);
  const pageCount = Math.max(
    1,
    Math.ceil(total / RESPONSE_NAVIGATION_PAGE_SIZE),
  );
  const currentPage = Math.min(requestedPage, pageCount);
  const rows = await db
    .select({
      id: submissions.id,
      userName: submissions.userName,
      userDiscordId: submissions.userDiscordId,
    })
    .from(submissions)
    .where(where)
    .orderBy(asc(submissions.submittedAt), asc(submissions.id))
    .limit(RESPONSE_NAVIGATION_PAGE_SIZE)
    .offset((currentPage - 1) * RESPONSE_NAVIGATION_PAGE_SIZE);

  return {
    items: rows.map((row, index) => ({
      id: row.id,
      displayName: row.userName || row.userDiscordId || "Anonymous",
      queueNumber:
        (currentPage - 1) * RESPONSE_NAVIGATION_PAGE_SIZE + index + 1,
    })),
    page: currentPage,
    pageCount,
    total,
  };
}

export async function createForm(formData: FormData) {
  await requireAdmin();

  const title = formData.get("title") as string;
  const description = formData.get("description") as string | null;

  const [form] = await db
    .insert(forms)
    .values({ title, description: description ? sanitizeHtml(description) : null })
    .returning();

  void sse.forms.pub("update", {
    formId: form.id,
    entity: "form",
    action: "created",
  });
  revalidatePath("/admin/form");
  redirect(`/admin/form/${form.id}`);
}

export async function createDefaultForm() {
  await requireAdmin();

  const [form] = await db
    .insert(forms)
    .values({ title: "New Form", description: "" })
    .returning();

  void sse.forms.pub("update", {
    formId: form.id,
    entity: "form",
    action: "created",
  });
  revalidatePath("/admin/form");
  redirect(`/admin/form/${form.id}`);
}

export async function updateForm(id: string, data: { title?: string; description?: string | null; isOpen?: boolean; closesAt?: string | null; allowMultipleSubmissions?: boolean; discordWebhookUrl?: string | null; discordWebhookTemplate?: string | null; discordWebhookUpdateTemplate?: string | null; allowedRoles?: string[]; deniedRoles?: string[] }) {
  await requireAdmin();
  if (data.title !== undefined && !data.title.trim()) {
    throw new Error("Form title is required.");
  }
  if (
    data.discordWebhookUrl &&
    !isValidDiscordWebhookUrl(data.discordWebhookUrl)
  ) {
    throw new Error("Enter a valid Discord webhook URL.");
  }

  const closesAt = data.closesAt === undefined
    ? undefined
    : data.closesAt === null
      ? null
      : new Date(data.closesAt);
  if (closesAt instanceof Date && Number.isNaN(closesAt.getTime())) {
    throw new Error("Enter a valid closing date and time.");
  }

  const nextData = {
    ...data,
    closesAt,
    description: data.description === undefined
      ? undefined
      : data.description
        ? sanitizeHtml(data.description)
        : data.description,
  };

  await db.update(forms).set(nextData).where(eq(forms.id, id));
  void sse.forms.pub("update", {
    formId: id,
    entity: "form",
    action: "updated",
  });
  revalidatePath("/form");
  revalidatePath("/admin/form");
}

export async function updateSubmissionAdminNote(
  formId: string,
  submissionId: string,
  note: string
) {
  await requireAdmin();

  if (
    typeof formId !== "string" ||
    !formId ||
    typeof submissionId !== "string" ||
    !submissionId ||
    typeof note !== "string" ||
    note.length > 10_000
  ) {
    throw new Error("Invalid admin note.");
  }

  const [updatedSubmission] = await db
    .update(submissions)
    .set({ adminNote: note.trim() || null })
    .where(
      and(
        eq(submissions.id, submissionId),
        eq(submissions.formId, formId)
      )
    )
    .returning({ id: submissions.id });

  if (!updatedSubmission) {
    throw new Error("Submission not found.");
  }

  revalidatePath(`/admin/form/${formId}/result`);
  revalidatePath(`/admin/form/${formId}/result/${submissionId}`);
  return { ok: true };
}

export async function testDiscordWebhook(url: string, content: string) {
  await requireAdmin();
  const trimmedUrl = url.trim();
  if (!isValidDiscordWebhookUrl(trimmedUrl)) {
    throw new Error("Enter a valid Discord webhook URL.");
  }
  if (!content.trim()) {
    throw new Error("The test message is empty.");
  }

  const response = await fetch(trimmedUrl, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ content: content.slice(0, 2000) }),
  });
  if (!response.ok) {
    throw new Error(`Discord rejected the test message (${response.status}).`);
  }
  return { ok: true };
}

export async function deleteForm(id: string) {
  await requireAdmin();

  await db.delete(forms).where(eq(forms.id, id));
  void sse.forms.pub("update", {
    formId: id,
    entity: "form",
    action: "deleted",
  });
  revalidatePath("/admin/form");
}