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

// Gestión del foro para el admin, sobre el esquema FusionCMS (ver sql/forum_fusion.sql):
//   forum_categories(id, order, name)
//   forum_forums(id, category, order, name, description, icon, colortitle, type)
// No hay columnas _en / visibility / deleted: las categorías y foros son datos del
// seed, editables aquí. Borrar un foro es un DELETE real (se rechaza si tiene temas).

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

export interface AdminForum {
  id: number
  category: number
  name: string
  description: string
  icon: string | null
  colortitle: string | null
  type: number
  order: number
}

export async function listCategoriesWithForums(): Promise<
  { category: AdminCategory; forums: AdminForum[] }[]
> {
  const [cats] = await db(DB.web).query<RowDataPacket[]>(
    'SELECT id, name, `order` FROM forum_categories ORDER BY `order`, id',
  )
  const [forums] = await db(DB.web).query<RowDataPacket[]>(
    'SELECT id, category, name, description, icon, colortitle, type, `order` FROM forum_forums ORDER BY `order`, id',
  )
  return cats.map((c) => ({
    category: { id: c.id, name: c.name, order: c.order },
    forums: forums
      .filter((f) => f.category === c.id)
      .map((f) => ({
        id: f.id,
        category: f.category,
        name: f.name,
        description: f.description,
        icon: f.icon,
        colortitle: f.colortitle,
        type: f.type,
        order: f.order,
      })),
  }))
}

export async function createCategory(name: string, order: number): Promise<number> {
  const [res] = await db(DB.web).query<ResultSetHeader>(
    'INSERT INTO forum_categories (name, `order`) VALUES (?, ?)',
    [name.slice(0, 45), order],
  )
  return res.insertId
}

export async function updateCategory(id: number, name: string, order: number): Promise<void> {
  await db(DB.web).query('UPDATE forum_categories SET name = ?, `order` = ? WHERE id = ?', [
    name.slice(0, 45),
    order,
    id,
  ])
}

/** Borra una categoría solo si no tiene foros. */
export async function deleteCategory(id: number): Promise<boolean> {
  const [f] = await db(DB.web).query<RowDataPacket[]>(
    'SELECT COUNT(*) AS n FROM forum_forums WHERE category = ?',
    [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 interface ForumInput {
  category: number
  name: string
  description: string
  icon: string | null
  colortitle: string | null
  type: number
  order: number
}

export async function createForum(f: ForumInput): Promise<number> {
  const [res] = await db(DB.web).query<ResultSetHeader>(
    'INSERT INTO forum_forums (category, name, description, icon, colortitle, type, `order`) VALUES (?, ?, ?, ?, ?, ?, ?)',
    [f.category, f.name.slice(0, 45), f.description, f.icon || null, f.colortitle || null, f.type, f.order],
  )
  return res.insertId
}

export async function updateForum(id: number, f: ForumInput): Promise<void> {
  await db(DB.web).query(
    'UPDATE forum_forums SET category = ?, name = ?, description = ?, icon = ?, colortitle = ?, type = ?, `order` = ? WHERE id = ?',
    [f.category, f.name.slice(0, 45), f.description, f.icon || null, f.colortitle || null, f.type, f.order, id],
  )
}

/** Borra un foro solo si no tiene temas. */
export async function deleteForum(id: number): Promise<boolean> {
  const [t] = await db(DB.web).query<RowDataPacket[]>('SELECT COUNT(*) AS n FROM forum_topics WHERE forum = ?', [id])
  if (Number(t[0]?.n ?? 0) > 0) return false
  await db(DB.web).query('DELETE FROM forum_forums WHERE id = ?', [id])
  return true
}