"use server";

import { revalidatePath } from "next/cache";
import { redirect } from "next/navigation";
import { headers } from "next/headers";
import { z } from "zod";
import { eq } from "drizzle-orm";
import { whatsappAccounts, whatsappGroups } from "@cmbot/db";
import { db } from "@/lib/db";
import { getSeededOperator } from "@/lib/operator";
import { pgNotifyBot } from "@/lib/notify";
import { checkRateLimit } from "@/lib/rate-limit";

async function rateLimit(key: string) {
  const h = await headers();
  const ip =
    h.get("x-forwarded-for")?.split(",")[0]?.trim() ??
    h.get("x-real-ip") ??
    "unknown";
  const r = await checkRateLimit(`${key}:${ip}`, { max: 30, windowSec: 10 });
  if (r.limited) throw new Error("Too many requests");
}

const addAccountSchema = z.object({
  label: z
    .string()
    .trim()
    .min(1, "Label is required")
    .max(60, "Label too long (max 60)"),
});

export type AddAccountResult =
  | { ok: true; accountId: string }
  | { ok: false; error: string };

/**
 * Step 1 of the lifecycle: create an account row with status='unpaired'.
 * No QR scan yet. Caller redirects to /accounts/[id] where the operator
 * sees the account detail with a "Pair Now" button.
 */
export async function addAccountAction(
  _prev: unknown,
  formData: FormData,
): Promise<AddAccountResult> {
  await rateLimit("add-account");
  const parsed = addAccountSchema.safeParse({ label: formData.get("label") });
  if (!parsed.success) {
    return { ok: false, error: parsed.error.issues[0]?.message ?? "Invalid label" };
  }
  const op = await getSeededOperator();
  const existing = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.operatorId, op.id), eq(a.label, parsed.data.label)),
  });
  if (existing) {
    return {
      ok: false,
      error: `An account labelled "${parsed.data.label}" already exists.`,
    };
  }
  const [created] = await db
    .insert(whatsappAccounts)
    .values({ operatorId: op.id, label: parsed.data.label, status: "unpaired" })
    .returning({ id: whatsappAccounts.id });
  revalidatePath("/accounts");
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  redirect(`/accounts/${created!.id}` as any);
}

const renameAccountSchema = z.object({
  accountId: z.string().uuid(),
  label: z
    .string()
    .trim()
    .min(1, "Label is required")
    .max(60, "Label too long (max 60)"),
});

export type RenameAccountResult =
  | { ok: true }
  | { ok: false; error: string };

/**
 * Edit the operator-facing label for an existing account. The label is
 * what shows up in lists, the page header, and run history; it has no
 * effect on the WhatsApp side.
 */
export async function renameAccountAction(input: {
  accountId: string;
  label: string;
}): Promise<RenameAccountResult> {
  await rateLimit("rename-account");
  const parsed = renameAccountSchema.safeParse(input);
  if (!parsed.success) {
    return { ok: false, error: parsed.error.issues[0]?.message ?? "Invalid input" };
  }
  const op = await getSeededOperator();
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) =>
      and(eq(a.id, parsed.data.accountId), eq(a.operatorId, op.id)),
  });
  if (!account) return { ok: false, error: "Account not found" };
  // Reject duplicate labels for the same operator.
  const dupe = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and, ne }) =>
      and(
        eq(a.operatorId, op.id),
        eq(a.label, parsed.data.label),
        ne(a.id, parsed.data.accountId),
      ),
  });
  if (dupe) {
    return {
      ok: false,
      error: `An account labelled "${parsed.data.label}" already exists.`,
    };
  }
  await db
    .update(whatsappAccounts)
    .set({ label: parsed.data.label })
    .where(eq(whatsappAccounts.id, parsed.data.accountId));
  revalidatePath("/accounts");
  revalidatePath(`/accounts/${parsed.data.accountId}`);
  return { ok: true };
}

/**
 * Trigger pair / re-pair for an existing account. Transitions the row to
 * status='pending' and asks the bot to open a Baileys session. Operator
 * lands on the live QR page.
 */
export async function pairAccountAction(formData: FormData): Promise<void> {
  await rateLimit("pair");
  const accountId = formData.get("accountId");
  if (typeof accountId !== "string") return;
  const op = await getSeededOperator();
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, accountId), eq(a.operatorId, op.id)),
  });
  if (!account) return;
  if (account.status === "connected") {
    // Already connected — bounce to detail
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    redirect(`/accounts/${accountId}` as any);
  }
  await db
    .update(whatsappAccounts)
    .set({ status: "pending", lastQrAt: new Date() })
    .where(eq(whatsappAccounts.id, accountId));
  await pgNotifyBot({ type: "account.start_pairing", accountId });
  revalidatePath("/accounts");
  revalidatePath(`/accounts/${accountId}`);
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  redirect(`/accounts/${accountId}/pairing` as any);
}

/**
 * Unpair: stop the Baileys session and clear session files via the bot,
 * but KEEP the account row (status -> 'unpaired') so the operator can
 * re-pair without retyping the label or losing any references.
 */
export async function unpairAccountAction(formData: FormData): Promise<void> {
  await rateLimit("unpair");
  const accountId = formData.get("accountId");
  if (typeof accountId !== "string") return;
  const op = await getSeededOperator();
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, accountId), eq(a.operatorId, op.id)),
  });
  if (!account) return;
  await pgNotifyBot({ type: "account.unpair", accountId });
  await db
    .update(whatsappAccounts)
    .set({ status: "unpaired", phoneNumber: null })
    .where(eq(whatsappAccounts.id, accountId));
  // Soft-archive synced groups instead of DELETEing. Hard delete
  // failed with "violates foreign key constraint
  // reminder_targets_group_id_whatsapp_groups_id_fk" whenever any
  // group had ever been used in a reminder, which aborted the
  // unpair. Archived groups vanish from the picker; a re-pair flips
  // them back via the on-conflict upsert in syncGroupsForAccount.
  await db
    .update(whatsappGroups)
    .set({ isArchived: true })
    .where(eq(whatsappGroups.accountId, accountId));
  revalidatePath("/accounts");
  revalidatePath(`/accounts/${accountId}`);
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  redirect(`/accounts/${accountId}` as any);
}

/**
 * Permanently delete an account, its groups, reminders and run history
 * via the cascade FKs added in migration 0003.
 */
export async function deleteAccountAction(formData: FormData): Promise<void> {
  await rateLimit("delete-account");
  const accountId = formData.get("accountId");
  if (typeof accountId !== "string") return;
  const op = await getSeededOperator();
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, accountId), eq(a.operatorId, op.id)),
  });
  if (!account) return;
  // Tell the bot to logout() over the live socket FIRST (so WhatsApp
  // drops this device from the operator's linked-devices list), then
  // close + remove session files. Distinct from account.unpair which
  // never calls logout — keeping linked-devices clean is specific to
  // the delete flow.
  await pgNotifyBot({ type: "account.delete", accountId });
  // Cascade FKs handle groups, reminders, runs, run_targets, messages.
  await db.delete(whatsappAccounts).where(eq(whatsappAccounts.id, accountId));
  revalidatePath("/accounts");
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  redirect("/accounts" as any);
}

export async function syncGroupsAction(formData: FormData): Promise<void> {
  await rateLimit("sync");
  const accountId = formData.get("accountId");
  if (typeof accountId !== "string") return;
  const op = await getSeededOperator();
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) =>
      and(eq(a.id, accountId), eq(a.operatorId, op.id)),
  });
  if (!account) return;
  await pgNotifyBot({ type: "account.sync_groups", accountId });
  revalidatePath(`/accounts/${accountId}`);
  revalidatePath(`/accounts/${accountId}/groups`);
}