"use server";

import { and, eq, max } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { z } from "zod";
import type { ApiAuthContext } from "@/lib/api-auth";
import { db } from "@/lib/db";
import { getCurrentSession } from "@/lib/session";
import { logActivityForScope } from "@/modules/_core/activity";
import { fireItemToggleHooks } from "@/modules/_core/registry";
import { listItems, lists } from "../schema";
import { canAccessList, getList, getListForScope } from "./queries";
import { notifyListChanged } from "./realtime";
import { itemInput, listInput, listUpdateInput, updateItemInput } from "./schemas";

function toScope(ctx: ApiAuthContext) {
  return { householdId: ctx.householdId, userId: ctx.userId };
}

export async function createListForScope(scope: ApiAuthContext, input: z.input<typeof listInput>) {
  const parsed = listInput.parse(input);
  const [list] = await db
    .insert(lists)
    .values({
      householdId: scope.householdId,
      type: parsed.type,
      name: parsed.name,
    })
    .returning();

  if (!list) throw new Error("List was not created");
  await logActivityForScope(toScope(scope), {
    entityType: "lists.list",
    entityId: list.id,
    action: "create",
    payload: { name: list.name },
  });
  return list;
}

export async function createList(input: z.input<typeof listInput>) {
  const { household, user } = await getCurrentSession();
  const list = await createListForScope(
    { householdId: household.id, userId: user.id, role: null },
    input,
  );
  revalidatePath("/lists");
  return list;
}

export async function updateListForScope(
  scope: ApiAuthContext,
  input: { id: string } & z.input<typeof listUpdateInput>,
) {
  const parsed = z.object({ id: z.string().uuid() }).and(listUpdateInput).parse(input);
  await assertCanAccessList(parsed.id, scope.householdId);

  await db
    .update(lists)
    .set({
      name: parsed.name,
      type: parsed.type,
      archived: parsed.archived,
    })
    .where(eq(lists.id, parsed.id));

  if (parsed.name || parsed.type) {
    await logActivityForScope(toScope(scope), {
      entityType: "lists.list",
      entityId: parsed.id,
      action: "update",
      payload: {
        ...(parsed.name ? { name: parsed.name } : {}),
        ...(parsed.type ? { type: parsed.type } : {}),
      },
    });
  }
  if (parsed.archived === true) {
    await logActivityForScope(toScope(scope), {
      entityType: "lists.list",
      entityId: parsed.id,
      action: "archive",
    });
  }

  await notifyListChanged(parsed.id);
}

export async function renameList(input: { id: string; name: string }) {
  const parsed = z.object({ id: z.string().uuid(), name: listInput.shape.name }).parse(input);
  const { household, user } = await getCurrentSession();
  await updateListForScope(
    { householdId: household.id, userId: user.id, role: null },
    { id: parsed.id, name: parsed.name },
  );
  revalidatePath("/lists");
  revalidatePath(`/lists/${parsed.id}`);
}

export async function updateListProperties(input: { id: string; name?: string; type?: string }) {
  const parsed = z
    .object({
      id: z.string().uuid(),
      name: listInput.shape.name.optional(),
      type: listInput.shape.type.optional(),
    })
    .parse(input);
  const { household, user } = await getCurrentSession();
  await updateListForScope({ householdId: household.id, userId: user.id, role: null }, parsed);
  revalidatePath("/lists");
  revalidatePath(`/lists/${parsed.id}`);
}

export async function archiveList(input: { id: string }) {
  const parsed = z.object({ id: z.string().uuid() }).parse(input);
  const { household, user } = await getCurrentSession();
  await updateListForScope(
    { householdId: household.id, userId: user.id, role: null },
    { id: parsed.id, archived: true },
  );
  revalidatePath("/lists");
  revalidatePath(`/lists/${parsed.id}`);
}

export async function deleteListForScope(scope: ApiAuthContext, input: { id: string }) {
  await updateListForScope(scope, { id: input.id, archived: true });
}

export async function addItemForScope(scope: ApiAuthContext, input: z.input<typeof itemInput>) {
  const parsed = itemInput.parse(input);
  await assertCanAccessList(parsed.listId, scope.householdId);

  const [positionRow] = await db
    .select({ maxPosition: max(listItems.position) })
    .from(listItems)
    .where(eq(listItems.listId, parsed.listId));

  const [item] = await db
    .insert(listItems)
    .values({
      listId: parsed.listId,
      text: parsed.text,
      qty: parsed.qty || null,
      notes: parsed.notes || null,
      dueAt: parsed.dueAt ?? null,
      assigneeId: parsed.assigneeId ?? null,
      metadata: parsed.metadata ?? null,
      position: (positionRow?.maxPosition ?? -1) + 1,
    })
    .returning();

  if (!item) throw new Error("List item was not created");
  await logActivityForScope(toScope(scope), {
    entityType: "lists.item",
    entityId: item.id,
    action: "create",
    payload: { text: item.text },
  });
  await notifyListChanged(parsed.listId);
  return toItemDto(item);
}

export async function addItem(input: z.input<typeof itemInput>) {
  const parsed = itemInput.parse(input);
  const { household, user } = await getCurrentSession();
  await addItemForScope({ householdId: household.id, userId: user.id, role: null }, parsed);
  revalidatePath(`/lists/${parsed.listId}`);
  return getList(parsed.listId);
}

export async function toggleItemForScope(
  scope: ApiAuthContext,
  input: { id: string; done?: boolean },
) {
  const parsed = z.object({ id: z.string().uuid(), done: z.boolean().optional() }).parse(input);
  const existing = await getAuthorizedItem(parsed.id, scope.householdId);
  const done = parsed.done ?? !existing.done;

  await db
    .update(listItems)
    .set({ done, updatedAt: new Date() })
    .where(eq(listItems.id, parsed.id));

  await logActivityForScope(toScope(scope), {
    entityType: "lists.item",
    entityId: parsed.id,
    action: "toggle",
    payload: { done, text: existing.text },
  });

  if (done && existing.metadata && scope.userId) {
    await fireItemToggleHooks({
      itemId: parsed.id,
      metadata: existing.metadata as Record<string, unknown>,
      done,
      userId: scope.userId,
    });
  }

  await notifyListChanged(existing.listId);
  return getListForScope(scope.householdId, existing.listId);
}

export async function toggleItem(input: { id: string; done?: boolean }) {
  const { household, user } = await getCurrentSession();
  const list = await toggleItemForScope(
    { householdId: household.id, userId: user.id, role: null },
    input,
  );
  revalidatePath(`/lists/${list.id}`);
  return list;
}

export async function updateItemForScope(
  scope: ApiAuthContext,
  input: z.input<typeof updateItemInput>,
) {
  const parsed = updateItemInput.parse(input);
  const existing = await getAuthorizedItem(parsed.id, scope.householdId);

  if (parsed.done !== undefined) {
    return toggleItemForScope(scope, { id: parsed.id, done: parsed.done });
  }

  await db
    .update(listItems)
    .set({
      text: parsed.text,
      qty: parsed.qty === undefined ? undefined : parsed.qty || null,
      notes: parsed.notes === undefined ? undefined : parsed.notes || null,
      dueAt: parsed.dueAt === undefined ? undefined : parsed.dueAt,
      assigneeId: parsed.assigneeId === undefined ? undefined : parsed.assigneeId,
      updatedAt: new Date(),
    })
    .where(eq(listItems.id, parsed.id));

  await logActivityForScope(toScope(scope), {
    entityType: "lists.item",
    entityId: parsed.id,
    action: "update",
    payload: { text: parsed.text ?? existing.text },
  });
  await notifyListChanged(existing.listId);
  return getListForScope(scope.householdId, existing.listId);
}

export async function updateItem(input: z.input<typeof updateItemInput>) {
  const { household, user } = await getCurrentSession();
  const list = await updateItemForScope(
    { householdId: household.id, userId: user.id, role: null },
    input,
  );
  revalidatePath(`/lists/${list.id}`);
  return list;
}

export async function deleteItemForScope(scope: ApiAuthContext, input: { id: string }) {
  const parsed = z.object({ id: z.string().uuid() }).parse(input);
  const existing = await getAuthorizedItem(parsed.id, scope.householdId);
  await logActivityForScope(toScope(scope), {
    entityType: "lists.item",
    entityId: parsed.id,
    action: "delete",
    payload: { text: existing.text },
  });
  await db.delete(listItems).where(eq(listItems.id, parsed.id));
  await notifyListChanged(existing.listId);
  return getListForScope(scope.householdId, existing.listId);
}

export async function deleteItem(input: { id: string }) {
  const { household, user } = await getCurrentSession();
  const list = await deleteItemForScope(
    { householdId: household.id, userId: user.id, role: null },
    input,
  );
  revalidatePath(`/lists/${list.id}`);
  return list;
}

export async function reorderItems(input: { listId: string; itemIds: string[] }) {
  const parsed = z
    .object({ listId: z.string().uuid(), itemIds: z.array(z.string().uuid()) })
    .parse(input);
  const { household } = await getCurrentSession();
  await assertCanAccessList(parsed.listId, household.id);

  await db.transaction(async (tx) => {
    for (const [position, id] of parsed.itemIds.entries()) {
      await tx
        .update(listItems)
        .set({ position, updatedAt: new Date() })
        .where(and(eq(listItems.id, id), eq(listItems.listId, parsed.listId)));
    }
  });

  revalidatePath(`/lists/${parsed.listId}`);
  await notifyListChanged(parsed.listId);
  return getList(parsed.listId);
}

async function assertCanAccessList(listId: string, householdId: string) {
  if (!(await canAccessList(listId, householdId))) throw new Error("Forbidden");
}

async function getAuthorizedItem(itemId: string, householdId: string) {
  const [item] = await db
    .select({
      id: listItems.id,
      listId: listItems.listId,
      done: listItems.done,
      text: listItems.text,
      metadata: listItems.metadata,
    })
    .from(listItems)
    .innerJoin(lists, eq(listItems.listId, lists.id))
    .where(and(eq(listItems.id, itemId), eq(lists.householdId, householdId)))
    .limit(1);

  if (!item) throw new Error("Item not found");
  return item;
}

function toItemDto(item: typeof listItems.$inferSelect) {
  return {
    id: item.id,
    listId: item.listId,
    text: item.text,
    done: item.done,
    qty: item.qty,
    notes: item.notes,
    dueAt: item.dueAt?.toISOString() ?? null,
    assigneeId: item.assigneeId,
    position: item.position,
    createdAt: item.createdAt.toISOString(),
    updatedAt: item.updatedAt.toISOString(),
  };
}