import type { RowDataPacket, ResultSetHeader } from 'mysql2'
import { db, DB } from './db'

export interface AdminCategory {
  id: number
  name: string
  name_en: string
  order: number
}

export interface AdminForum {
  id: number
  category_id: number
  name: string
  name_en: string
  description: string
  description_en: string
  order: number
  visibility: number
}

/** Categorías con sus foros (incluye ocultos y sin borrar), para el admin. */
export async function listCategoriesWithForums(): Promise<
  { category: AdminCategory; forums: AdminForum[] }[]
> {
  const [cats] = await db(DB.web).query<RowDataPacket[]>(
    'SELECT id, name, name_en, `order` FROM forum_categories ORDER BY `order`, id',
  )
  const [forums] = await db(DB.web).query<RowDataPacket[]>(
    'SELECT id, category_id, name, name_en, description, description_en, `order`, visibility FROM forums WHERE deleted = 0 ORDER BY `order`, id',
  )
  return cats.map((c) => ({
    category: { id: c.id, name: c.name, name_en: c.name_en || '', order: c.order },
    forums: forums
      .filter((f) => f.category_id === c.id)
      .map((f) => ({
        id: f.id,
        category_id: f.category_id,
        name: f.name,
        name_en: f.name_en || '',
        description: f.description,
        description_en: f.description_en || '',
        order: f.order,
        visibility: f.visibility,
      })),
  }))
}

export async function createCategory(name: string, nameEn: string | null, order: number): Promise<number> {
  const [res] = await db(DB.web).query<ResultSetHeader>(
    'INSERT INTO forum_categories (name, name_en, `order`, created_at) VALUES (?, ?, ?, NOW())',
    [name, nameEn || null, order],
  )
  return res.insertId
}

export async function updateCategory(id: number, name: string, nameEn: string | null, order: number): Promise<void> {
  await db(DB.web).query('UPDATE forum_categories SET name = ?, name_en = ?, `order` = ? WHERE id = ?', [
    name,
    nameEn || null,
    order,
    id,
  ])
}

/** Borra una categoría solo si no tiene foros (no borrados). */
export async function deleteCategory(id: number): Promise<boolean> {
  const [f] = await db(DB.web).query<RowDataPacket[]>(
    'SELECT COUNT(*) AS n FROM forums WHERE category_id = ? AND deleted = 0',
    [id],
  )
  if (Number(f[0]?.n ?? 0) > 0) return false
  await db(DB.web).query('DELETE FROM forum_categories WHERE id = ?', [id])
  return true
}

export async function createForum(
  categoryId: number,
  name: string,
  nameEn: string | null,
  description: string,
  descriptionEn: string | null,
  order: number,
  visibility: number,
): Promise<number> {
  const [res] = await db(DB.web).query<ResultSetHeader>(
    'INSERT INTO forums (category_id, name, name_en, description, description_en, `order`, type, visibility, deleted, created_at, updated_at) ' +
      'VALUES (?, ?, ?, ?, ?, ?, 0, ?, 0, NOW(), NOW())',
    [categoryId, name, nameEn || null, description, descriptionEn || null, order, visibility ? 1 : 0],
  )
  return res.insertId
}

export async function updateForum(
  id: number,
  name: string,
  nameEn: string | null,
  description: string,
  descriptionEn: string | null,
  order: number,
  visibility: number,
): Promise<void> {
  await db(DB.web).query(
    'UPDATE forums SET name = ?, name_en = ?, description = ?, description_en = ?, `order` = ?, visibility = ?, updated_at = NOW() WHERE id = ?',
    [name, nameEn || null, description, descriptionEn || null, order, visibility ? 1 : 0, id],
  )
}

/** Borrado lógico de un foro (deleted = 1). */
export async function deleteForum(id: number): Promise<void> {
  await db(DB.web).query('UPDATE forums SET deleted = 1 WHERE id = ?', [id])
}

/** Cambia la visibilidad de un foro. */
export async function setForumVisibility(id: number, visible: boolean): Promise<void> {
  await db(DB.web).query('UPDATE forums SET visibility = ? WHERE id = ?', [visible ? 1 : 0, id])
}