'use strict'

const { query } = require('../database/postgres')

function tFilter(tenantId, alias = 't') {
  if (!tenantId) return ''
  const id = parseInt(tenantId, 10)
  if (!Number.isInteger(id) || id <= 0) throw new Error('tenantId inválido')
  return `AND ${alias}.tenant_id = ${id}`
}

class Analytics {
  static async getRevenueStats(raffle_id = null, tenantId = null) {
    const raffleFilter  = raffle_id ? `AND r.id = $1` : ''
    const tenantFilter  = tenantId  ? `AND t.tenant_id = ${parseInt(tenantId)}` : ''
    const params        = raffle_id ? [raffle_id] : []

    const sql = `
      SELECT
        COALESCE(SUM(t.price_paid), 0) AS total_revenue,
        COALESCE(AVG(t.price_paid), 0) AS avg_price,
        COUNT(t.id)                    AS total_tickets_sold
      FROM tickets t
      JOIN raffles r ON r.id = t.raffle_id
      WHERE t.status = 'sold' ${raffleFilter} ${tenantFilter}
    `
    const res = await query(sql, params)
    const row = res[0] || { total_revenue: 0, avg_price: 0, total_tickets_sold: 0 }

    const tWhere = tenantId ? `WHERE tenant_id = ${parseInt(tenantId, 10)}` : ''
    const [usersRow]  = await query(`SELECT COUNT(*) AS cnt FROM users ${tWhere}`)
    const [activeRow] = await query(
      tenantId
        ? `SELECT COUNT(t.id) AS cnt FROM tickets t JOIN raffles r ON r.id = t.raffle_id WHERE r.tenant_id = ${parseInt(tenantId, 10)} AND t.status = 'sold'`
        : `SELECT COUNT(*) AS cnt FROM tickets WHERE status = 'sold'`
    )

    row.total_users    = usersRow?.cnt  ?? 0
    row.active_tickets = activeRow?.cnt ?? 0
    return row
  }

  static getSalesByDay(tenantId = null) {
    const f = tFilter(tenantId)
    return query(`
      SELECT
        DATE(t.data_compra)  AS date,
        COUNT(t.id)          AS tickets_sold,
        SUM(t.price_paid)    AS revenue
      FROM tickets t
      WHERE t.data_compra >= NOW() - INTERVAL '30 days' AND t.status = 'sold' ${f}
      GROUP BY date
      ORDER BY date ASC
    `)
  }

  static getSalesByHour(tenantId = null) {
    const f = tFilter(tenantId)
    return query(`
      SELECT
        EXTRACT(HOUR FROM t.data_compra) AS hour_of_day,
        COUNT(t.id)                      AS tickets_sold,
        COALESCE(SUM(t.price_paid), 0)   AS revenue
      FROM tickets t
      WHERE t.data_compra >= NOW() - INTERVAL '7 days' AND t.status = 'sold' ${f}
      GROUP BY hour_of_day
      ORDER BY hour_of_day ASC
    `)
  }

  static getSalesByRaffle(tenantId = null) {
    const f = tenantId ? `AND r.tenant_id = ${parseInt(tenantId)}` : ''
    return query(`
      SELECT
        r.id                              AS raffle_id,
        r.titulo                          AS raffle_name,
        COUNT(t.id)                       AS tickets_sold,
        r.total_numeros,
        COALESCE(SUM(t.price_paid), 0)    AS revenue
      FROM raffles r
      LEFT JOIN tickets t ON t.raffle_id = r.id AND t.status = 'sold'
      WHERE r.ativo = 1 ${f}
      GROUP BY r.id, r.titulo, r.total_numeros
      ORDER BY tickets_sold DESC
    `)
  }
}

module.exports = Analytics