VPS 4 Builder
58 lines
1.6 KiB
JavaScript
58 lines
1.6 KiB
JavaScript
'use strict'
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const { query, execute, queryOne } = require('../database/postgres')
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class RaffleDiscount {
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static listByRaffle(raffleId) {
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return query(
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`SELECT id, min_qty, discount_pct, active
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FROM raffle_discounts
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WHERE raffle_id = $1
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ORDER BY min_qty ASC`,
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[raffleId]
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)
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}
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// Returns the best (highest) active discount for the given quantity
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static getBestForQty(raffleId, qty) {
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return queryOne(
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`SELECT id, min_qty, discount_pct
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FROM raffle_discounts
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WHERE raffle_id = $1 AND min_qty <= $2 AND active = TRUE
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ORDER BY discount_pct DESC
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LIMIT 1`,
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[raffleId, qty]
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)
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}
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// Returns the next discount tier above current qty (for "buy X more" hint)
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static getNextTier(raffleId, qty) {
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return queryOne(
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`SELECT id, min_qty, discount_pct
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FROM raffle_discounts
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WHERE raffle_id = $1 AND min_qty > $2 AND active = TRUE
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ORDER BY min_qty ASC
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LIMIT 1`,
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[raffleId, qty]
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)
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}
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static deleteByRaffle(raffleId) {
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return execute('DELETE FROM raffle_discounts WHERE raffle_id = $1', [raffleId])
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}
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static bulkInsert(raffleId, tiers) {
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if (!tiers || tiers.length === 0) return Promise.resolve()
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const values = tiers
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.map((t, i) => `($1, $${i * 2 + 2}, $${i * 2 + 3}, TRUE)`)
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.join(', ')
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const params = [raffleId, ...tiers.flatMap(t => [parseInt(t.min_qty), parseFloat(t.discount_pct)])]
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return execute(
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`INSERT INTO raffle_discounts (raffle_id, min_qty, discount_pct, active) VALUES ${values}`,
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params
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)
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}
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}
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module.exports = RaffleDiscount
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