/**
 * Queries de servidores
 * CRUD completo para a tabela servers
 */

import { query } from "../index";

export interface Server {
  server_id: number;
  server_name: string;
  server_type: "pvp" | "no-pvp" | "retro-pvp" | "hardcore-pvp" | null;
  location: "NA" | "SA" | "EU" | "OC" | "BR" | null;
  is_active: boolean;
  total_listings: number;
  total_users: number;
  total_subscribers: number;
  total_transactions: number;
  total_volume: number;
  average_listing_price: number;
  last_activity_at: Date | null;
  created_at: Date;
  updated_at: Date;
}

export interface ServerStats {
  total_listings?: number;
  total_users?: number;
  total_subscribers?: number;
  total_transactions?: number;
  total_volume?: number;
  average_listing_price?: number;
  last_activity_at?: Date;
}

/**
 * Lista todos os servidores
 */
export async function getAllServers(): Promise<Server[]> {
  const result = await query<Server>(
    `SELECT * FROM servers ORDER BY server_name ASC`,
  );
  return result.rows;
}

/**
 * Lista apenas servidores ativos
 */
export async function getActiveServers(): Promise<Server[]> {
  const result = await query<Server>(
    `SELECT * FROM servers WHERE is_active = TRUE ORDER BY server_name ASC`,
  );
  return result.rows;
}

/**
 * Busca servidor por nome
 */
export async function getServerByName(
  serverName: string,
): Promise<Server | null> {
  const result = await query<Server>(
    `SELECT * FROM servers WHERE server_name = $1`,
    [serverName],
  );
  return result.rows[0] || null;
}

/**
 * Busca servidor por ID
 */
export async function getServerById(serverId: number): Promise<Server | null> {
  const result = await query<Server>(
    `SELECT * FROM servers WHERE server_id = $1`,
    [serverId],
  );
  return result.rows[0] || null;
}

/**
 * Verifica se servidor existe e está ativo
 */
export async function isServerActive(serverName: string): Promise<boolean> {
  const result = await query<{ count: string }>(
    `SELECT COUNT(*) as count FROM servers WHERE server_name = $1 AND is_active = TRUE`,
    [serverName],
  );
  return parseInt(result.rows[0].count, 10) > 0;
}

/**
 * Incrementa estatísticas do servidor
 */
export async function incrementServerStats(
  serverName: string,
  stats: Partial<{
    total_listings: number;
    total_users: number;
    total_subscribers: number;
    total_transactions: number;
    total_volume: number;
  }>,
): Promise<void> {
  const updates: string[] = [];
  const values: any[] = [];
  let paramIndex = 1;

  if (stats.total_listings !== undefined) {
    updates.push(`total_listings = total_listings + $${paramIndex++}`);
    values.push(stats.total_listings);
  }
  if (stats.total_users !== undefined) {
    updates.push(`total_users = total_users + $${paramIndex++}`);
    values.push(stats.total_users);
  }
  if (stats.total_subscribers !== undefined) {
    updates.push(`total_subscribers = total_subscribers + $${paramIndex++}`);
    values.push(stats.total_subscribers);
  }
  if (stats.total_transactions !== undefined) {
    updates.push(`total_transactions = total_transactions + $${paramIndex++}`);
    values.push(stats.total_transactions);
  }
  if (stats.total_volume !== undefined) {
    updates.push(`total_volume = total_volume + $${paramIndex++}`);
    values.push(stats.total_volume);
  }

  if (updates.length === 0) {
    return;
  }

  // Sempre atualizar last_activity_at
  updates.push(`last_activity_at = CURRENT_TIMESTAMP`);
  values.push(serverName);

  await query(
    `UPDATE servers SET ${updates.join(", ")} WHERE server_name = $${paramIndex}`,
    values,
  );
}

/**
 * Atualiza estatísticas completas do servidor
 */
export async function updateServerStats(
  serverName: string,
  stats: ServerStats,
): Promise<void> {
  const updates: string[] = [];
  const values: any[] = [];
  let paramIndex = 1;

  if (stats.total_listings !== undefined) {
    updates.push(`total_listings = $${paramIndex++}`);
    values.push(stats.total_listings);
  }
  if (stats.total_users !== undefined) {
    updates.push(`total_users = $${paramIndex++}`);
    values.push(stats.total_users);
  }
  if (stats.total_subscribers !== undefined) {
    updates.push(`total_subscribers = $${paramIndex++}`);
    values.push(stats.total_subscribers);
  }
  if (stats.total_transactions !== undefined) {
    updates.push(`total_transactions = $${paramIndex++}`);
    values.push(stats.total_transactions);
  }
  if (stats.total_volume !== undefined) {
    updates.push(`total_volume = $${paramIndex++}`);
    values.push(stats.total_volume);
  }
  if (stats.average_listing_price !== undefined) {
    updates.push(`average_listing_price = $${paramIndex++}`);
    values.push(stats.average_listing_price);
  }
  if (stats.last_activity_at !== undefined) {
    updates.push(`last_activity_at = $${paramIndex++}`);
    values.push(stats.last_activity_at);
  }

  if (updates.length === 0) {
    return;
  }

  values.push(serverName);

  await query(
    `UPDATE servers SET ${updates.join(", ")} WHERE server_name = $${paramIndex}`,
    values,
  );
}

/**
 * Incrementa total_users de múltiplos servidores
 */
export async function incrementUsersForServers(
  serverNames: string[],
): Promise<void> {
  if (serverNames.length === 0) {
    return;
  }

  await query(
    `UPDATE servers 
     SET total_users = total_users + 1, 
         last_activity_at = CURRENT_TIMESTAMP
     WHERE server_name = ANY($1::text[])`,
    [serverNames],
  );
}