feat: initial project structure (Model Project) - Backend + Multi-Frontend + Docker

backend/models/PriceRule.js

@@ -0,0 +1,62 @@
+'use strict'
+
+const { execute, queryOne, query } = require('../database/postgres')
+const Raffle = require('./Raffle')
+
+class PriceRule {
+  static async create({ raffle_id, rule_type, price, start_at, end_at, priority }) {
+    return execute(
+      `INSERT INTO raffle_price_rules (raffle_id, rule_type, price, start_at, end_at, priority)
+       VALUES ($1, $2, $3, $4, $5, $6) RETURNING id`,
+      [raffle_id, rule_type, price, start_at || null, end_at || null, priority || 0]
+    )
+  }
+
+  static async listByRaffle(raffle_id) {
+    return query(
+      `SELECT * FROM raffle_price_rules WHERE raffle_id = $1 AND active = 1 ORDER BY priority DESC`,
+      [raffle_id]
+    )
+  }
+
+  /**
+   * Engine de Preço Dinâmico: Verifica qual regra está ativa agora.
+   * Retorna o preço apropriado e o ID da regra aplicada (se houver).
+   */
+  static async getCurrentPrice(raffle_id) {
+    const rules = await this.listByRaffle(raffle_id)
+    const now = new Date()
+
+    let appliedRuleId = null
+
+    for (const rule of rules) {
+      if (rule.rule_type === 'time_range') {
+        const start = rule.start_at ? new Date(rule.start_at) : new Date(0)
+        const end = rule.end_at ? new Date(rule.end_at) : new Date(8640000000000000) // max date
+        if (now >= start && now <= end) {
+          return { price: parseFloat(rule.price), rule_id: rule.id }
+        }
+      }
+
+      if (rule.rule_type === 'fixed') {
+        return { price: parseFloat(rule.price), rule_id: rule.id }
+      }
+    }
+
+    // Fallback: Busca o preço padrão do sorteio
+    const raffle = await Raffle.findById(raffle_id)
+    if (!raffle) throw new Error('Sorteio não encontrado')
+
+    return { price: parseFloat(raffle.preco_numero), rule_id: null }
+  }
+
+  static async logPrice({ raffle_id, order_id, user_cpf, price_applied, rule_id }) {
+    return execute(
+      `INSERT INTO price_logs (raffle_id, order_id, user_cpf, price_applied, rule_id)
+       VALUES ($1, $2, $3, $4, $5)`,
+      [raffle_id, order_id || null, user_cpf || null, price_applied, rule_id || null]
+    )
+  }
+}
+
+module.exports = PriceRule