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

export interface RecruitRewardView {
  id: number
  required_friends: number
  reward_name: string
  item_id: number
  item_quantity: number
  item_link: string
  icon_class: string
  claimed: boolean
}

/** IDs de cuentas reclutadas por `accountId` (con su IP). */
async function getRecruitedAccounts(accountId: number): Promise<{ id: number; last_ip: string | null }[]> {
  const [rows] = await db(DB.auth).query<RowDataPacket[]>(
    'SELECT id, last_ip FROM account WHERE recruiter = ?',
    [accountId],
  )
  return rows.map((r) => ({ id: r.id, last_ip: r.last_ip ?? null }))
}

/** Nº de personajes de amigos reclutados que han alcanzado el nivel 80. */
export async function getRecruitedLevel80Count(accountId: number): Promise<number> {
  const recruited = await getRecruitedAccounts(accountId)
  if (recruited.length === 0) return 0
  const ids = recruited.map((r) => r.id)
  const [rows] = await db(DB.characters).query<RowDataPacket[]>(
    'SELECT COUNT(*) AS n FROM characters WHERE level = 80 AND account IN (?)',
    [ids],
  )
  return Number(rows[0]?.n ?? 0)
}

/** Estado de reclutamiento de la cuenta: si fue reclutada y cuántos amigos ha reclutado. */
export async function getRecruitStats(accountId: number): Promise<{ isRecruited: boolean; recruitedCount: number }> {
  let isRecruited = false
  let recruitedCount = 0
  try {
    const [r] = await db(DB.auth).query<RowDataPacket[]>('SELECT recruiter FROM account WHERE id = ?', [accountId])
    isRecruited = Boolean(r[0]?.recruiter)
    const [c] = await db(DB.auth).query<RowDataPacket[]>('SELECT COUNT(*) AS n FROM account WHERE recruiter = ?', [accountId])
    recruitedCount = Number(c[0]?.n ?? 0)
  } catch {
    /* ignore */
  }
  return { isRecruited, recruitedCount }
}

/**
 * Cuentas reclutadas válidas: tienen un personaje de nivel 80 y NO comparten IP
 * con el reclutador (anti-abuso). Devuelve hasta `requiredCount` IDs.
 */
async function getValidRecruitsAtLevel80(accountId: number, requiredCount: number): Promise<number[]> {
  const recruited = await getRecruitedAccounts(accountId)
  if (recruited.length === 0) return []
  const ipById = new Map(recruited.map((r) => [r.id, r.last_ip]))
  const ids = recruited.map((r) => r.id)

  const [ipRows] = await db(DB.auth).query<RowDataPacket[]>('SELECT last_ip FROM account WHERE id = ?', [accountId])
  const userIp = ipRows[0]?.last_ip ?? null

  const [rows] = await db(DB.characters).query<RowDataPacket[]>(
    'SELECT DISTINCT account FROM characters WHERE level = 80 AND account IN (?)',
    [ids],
  )
  const atLevel80 = rows.map((r) => Number(r.account))
  // Excluir los que comparten IP con el reclutador.
  return atLevel80.filter((acc) => ipById.get(acc) !== userIp).slice(0, requiredCount)
}

/** Todas las recompensas con marca de si esta cuenta ya las reclamó. */
export async function getRecruitRewards(accountId: number | null): Promise<RecruitRewardView[]> {
  const [rows] = await db(DB.default).query<RowDataPacket[]>(
    'SELECT id, required_friends, reward_name, item_id, item_quantity, item_link, icon_class FROM recruitreward ORDER BY required_friends, id',
  )
  let claimedIds = new Set<number>()
  if (accountId) {
    const [claimed] = await db(DB.default).query<RowDataPacket[]>(
      'SELECT recruit_reward_id FROM claimedreward WHERE account_id = ?',
      [accountId],
    )
    claimedIds = new Set(claimed.map((c) => Number(c.recruit_reward_id)))
  }
  return rows.map((r) => ({
    id: r.id,
    required_friends: r.required_friends,
    reward_name: r.reward_name,
    item_id: r.item_id,
    item_quantity: r.item_quantity,
    item_link: r.item_link,
    icon_class: r.icon_class,
    claimed: claimedIds.has(Number(r.id)),
  }))
}

/** ¿El personaje pertenece a la cuenta? */
async function characterBelongsToAccount(accountId: number, name: string): Promise<boolean> {
  const [rows] = await db(DB.characters).query<RowDataPacket[]>(
    'SELECT 1 FROM characters WHERE name = ? AND account = ? LIMIT 1',
    [name, accountId],
  )
  return Boolean(rows[0])
}

export interface ClaimResult {
  success: boolean
  message: string // clave i18n de RecruitClaim
}

/** Reclama una recompensa de reclutamiento: valida requisitos, envía el item por SOAP y lo registra. */
export async function claimRecruitReward(
  accountId: number,
  username: string,
  rewardId: number,
  characterName: string,
  ip: string,
): Promise<ClaimResult> {
  const [rewardRows] = await db(DB.default).query<RowDataPacket[]>(
    'SELECT id, required_friends, reward_name, item_id, item_quantity FROM recruitreward WHERE id = ?',
    [rewardId],
  )
  const reward = rewardRows[0]
  if (!reward) return { success: false, message: 'rewardNotFound' }

  if (!(await characterBelongsToAccount(accountId, characterName))) {
    return { success: false, message: 'invalidCharacter' }
  }

  const [already] = await db(DB.default).query<RowDataPacket[]>(
    'SELECT 1 FROM claimedreward WHERE account_id = ? AND recruit_reward_id = ? LIMIT 1',
    [accountId, rewardId],
  )
  if (already[0]) return { success: false, message: 'alreadyClaimed' }

  const valid = await getValidRecruitsAtLevel80(accountId, reward.required_friends)
  if (valid.length < reward.required_friends) return { success: false, message: 'requirementsNotMet' }

  const command = `.send items ${characterName} 'Recompensa de Recluta Amigo' 'Tu amigo alcanzó el Nivel 80' ${reward.item_id}:${reward.item_quantity}`
  const response = await executeSoapCommand(command)
  if (!response || !response.includes('Mail sent to')) {
    return { success: false, message: 'deliveryError' }
  }

  await db(DB.default).query(
    'INSERT INTO claimedreward (account_id, username, recruit_reward_id, character_name, claimed_at, ip_address) VALUES (?, ?, ?, ?, NOW(), ?)',
    [accountId, username, rewardId, characterName, ip.slice(0, 45)],
  )
  return { success: true, message: 'claimSuccess' }
}