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| 1 | <?php |
| 2 | |
| 3 | namespace BuyerKiosk\ComebackCash\Services; |
| 4 | |
| 5 | use PDO; |
| 6 | use PDOException; |
| 7 | use DateTime; |
| 8 | use BuyerKiosk\ComebackCash\Models\Coupon; |
| 9 | use BuyerKiosk\ComebackCash\Models\Redemption; |
| 10 | |
| 11 | /** |
| 12 | * Redemption Service for Comeback Cash system |
| 13 | * |
| 14 | * Handles coupon redemption workflow per SDD lines 1050-1104: |
| 15 | * 1. Look up coupon by code (normalize: uppercase, remove hyphens) |
| 16 | * 2. Validate coupon status (must be 'active') |
| 17 | * 3. Validate expiration (expires_at > NOW()) |
| 18 | * 4. Validate minimum purchase (transaction_amount >= event.redemption_min_purchase) |
| 19 | * 5. Begin transaction |
| 20 | * 6. Update coupon (reduce value, set status='redeemed' if fully used) |
| 21 | * 7. Insert redemption audit record |
| 22 | * 8. Commit transaction |
| 23 | * 9. Return success response |
| 24 | * |
| 25 | * Error Codes (per SDD lines 1098-1104): |
| 26 | * - INVALID_CODE (404): Coupon code not found |
| 27 | * - ALREADY_REDEEMED (409): Coupon already fully redeemed |
| 28 | * - EXPIRED (410): Coupon has expired |
| 29 | * - MIN_PURCHASE_NOT_MET (422): Transaction below minimum |
| 30 | * |
| 31 | * @package BuyerKiosk\ComebackCash\Services |
| 32 | */ |
| 33 | class RedemptionService |
| 34 | { |
| 35 | private PDO $db; |
| 36 | private CouponService $couponService; |
| 37 | |
| 38 | /** |
| 39 | * Constructor |
| 40 | * |
| 41 | * @param PDO $db Database connection |
| 42 | * @param CouponService $couponService Service for coupon operations |
| 43 | */ |
| 44 | public function __construct(PDO $db, CouponService $couponService) |
| 45 | { |
| 46 | $this->db = $db; |
| 47 | $this->couponService = $couponService; |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Redeem a coupon against a transaction |
| 52 | * |
| 53 | * Business Rules Applied: |
| 54 | * - Rule 9: Minimum purchase for redemption must be >= coupon value |
| 55 | * - Rule 12: Coupons are bearer instruments - no identity verification required |
| 56 | * - Rule 14: Minimum purchase threshold is pre-tax (merchandise subtotal only) |
| 57 | * |
| 58 | * @param string $code Coupon code to redeem |
| 59 | * @param string $transactionId POS transaction ID |
| 60 | * @param float $transactionAmount Transaction total (pre-tax merchandise subtotal) |
| 61 | * @param int $employeeId Employee processing the redemption |
| 62 | * @param string $redemptionMethod How coupon was presented (scan|manual|pos) |
| 63 | * @param float|null $amountToRedeem Optional partial redemption amount |
| 64 | * @return array Response with success status and redemption details |
| 65 | */ |
| 66 | public function redeemCoupon( |
| 67 | string $code, |
| 68 | string $transactionId, |
| 69 | float $transactionAmount, |
| 70 | int $employeeId, |
| 71 | string $redemptionMethod, |
| 72 | ?float $amountToRedeem = null |
| 73 | ): array { |
| 74 | // Normalize code: trim whitespace, uppercase, remove hyphens |
| 75 | $normalizedCode = $this->normalizeCode($code); |
| 76 | |
| 77 | // Validate redemption amount if provided |
| 78 | if ($amountToRedeem !== null) { |
| 79 | if ($amountToRedeem <= 0) { |
| 80 | return [ |
| 81 | 'success' => false, |
| 82 | 'error' => 'Redemption amount must be greater than zero', |
| 83 | 'code' => 'INVALID_AMOUNT' |
| 84 | ]; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | // Look up coupon by code |
| 89 | $coupon = $this->couponService->findByCode($normalizedCode); |
| 90 | |
| 91 | if ($coupon === null) { |
| 92 | return [ |
| 93 | 'success' => false, |
| 94 | 'error' => 'Coupon code not found', |
| 95 | 'code' => 'INVALID_CODE' |
| 96 | ]; |
| 97 | } |
| 98 | |
| 99 | // Validate coupon status |
| 100 | $statusValidation = $this->validateCouponStatus($coupon); |
| 101 | if ($statusValidation !== null) { |
| 102 | return $statusValidation; |
| 103 | } |
| 104 | |
| 105 | // Validate expiration |
| 106 | if ($coupon->isExpired()) { |
| 107 | return [ |
| 108 | 'success' => false, |
| 109 | 'error' => 'Coupon expired', |
| 110 | 'code' => 'EXPIRED' |
| 111 | ]; |
| 112 | } |
| 113 | |
| 114 | // Get minimum purchase requirement from event |
| 115 | $minimumPurchase = $this->couponService->getMinimumPurchaseForEvent($coupon->getEventId()); |
| 116 | |
| 117 | // Validate minimum purchase |
| 118 | if ($transactionAmount < $minimumPurchase) { |
| 119 | return [ |
| 120 | 'success' => false, |
| 121 | 'error' => "Minimum purchase of \${$minimumPurchase} required", |
| 122 | 'code' => 'MIN_PURCHASE_NOT_MET', |
| 123 | 'minimum_required' => $minimumPurchase |
| 124 | ]; |
| 125 | } |
| 126 | |
| 127 | // Determine redemption amount |
| 128 | $couponValue = $coupon->getValue(); |
| 129 | $actualRedemptionAmount = $amountToRedeem ?? $couponValue; |
| 130 | |
| 131 | // Cap at coupon value if amount exceeds it |
| 132 | if ($actualRedemptionAmount > $couponValue) { |
| 133 | $actualRedemptionAmount = $couponValue; |
| 134 | } |
| 135 | |
| 136 | // Calculate remaining value after redemption |
| 137 | $remainingValue = round($couponValue - $actualRedemptionAmount, 2); |
| 138 | |
| 139 | // Determine new status |
| 140 | // If remaining value is negligible (< $0.01), mark as fully redeemed |
| 141 | $newStatus = $remainingValue < 0.01 |
| 142 | ? Coupon::STATUS_REDEEMED |
| 143 | : Coupon::STATUS_ACTIVE; |
| 144 | |
| 145 | // Set remaining to exactly 0 if fully redeemed |
| 146 | if ($newStatus === Coupon::STATUS_REDEEMED) { |
| 147 | $remainingValue = 0.00; |
| 148 | } |
| 149 | |
| 150 | // Execute redemption in atomic transaction |
| 151 | try { |
| 152 | $this->db->beginTransaction(); |
| 153 | |
| 154 | // Update coupon status and value |
| 155 | $this->couponService->updateCouponStatus( |
| 156 | $coupon->getId(), |
| 157 | $newStatus, |
| 158 | $remainingValue |
| 159 | ); |
| 160 | |
| 161 | // Insert redemption audit record |
| 162 | $this->insertRedemptionRecord( |
| 163 | $coupon->getId(), |
| 164 | $actualRedemptionAmount, |
| 165 | $transactionId, |
| 166 | $transactionAmount, |
| 167 | $employeeId, |
| 168 | $redemptionMethod |
| 169 | ); |
| 170 | |
| 171 | $this->db->commit(); |
| 172 | |
| 173 | return [ |
| 174 | 'success' => true, |
| 175 | 'redeemed_amount' => $actualRedemptionAmount, |
| 176 | 'remaining_value' => $remainingValue, |
| 177 | 'coupon_status' => $newStatus, |
| 178 | 'redemption_method' => $redemptionMethod |
| 179 | ]; |
| 180 | |
| 181 | } catch (PDOException $e) { |
| 182 | $this->db->rollBack(); |
| 183 | return [ |
| 184 | 'success' => false, |
| 185 | 'error' => 'Database error during redemption: ' . $e->getMessage(), |
| 186 | 'code' => 'DATABASE_ERROR' |
| 187 | ]; |
| 188 | } catch (\Exception $e) { |
| 189 | $this->db->rollBack(); |
| 190 | return [ |
| 191 | 'success' => false, |
| 192 | 'error' => 'Error during redemption: ' . $e->getMessage(), |
| 193 | 'code' => 'REDEMPTION_ERROR' |
| 194 | ]; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Get redemptions for a specific event with optional date filtering |
| 200 | * |
| 201 | * @param int $eventId The event ID to query redemptions for |
| 202 | * @param DateTime|null $startDate Optional start date filter |
| 203 | * @param DateTime|null $endDate Optional end date filter |
| 204 | * @return Redemption[] Array of Redemption objects |
| 205 | */ |
| 206 | public function getRedemptionsByEvent( |
| 207 | int $eventId, |
| 208 | ?DateTime $startDate = null, |
| 209 | ?DateTime $endDate = null |
| 210 | ): array { |
| 211 | $sql = " |
| 212 | SELECT r.*, c.code as coupon_code, c.original_value, c.event_id |
| 213 | FROM ccRedemptions r |
| 214 | JOIN ccCoupons c ON r.coupon_id = c.id |
| 215 | WHERE c.event_id = :event_id |
| 216 | "; |
| 217 | |
| 218 | $params = [':event_id' => $eventId]; |
| 219 | |
| 220 | if ($startDate !== null) { |
| 221 | $sql .= " AND r.redeemed_at >= :start_date"; |
| 222 | $params[':start_date'] = $startDate->format('Y-m-d H:i:s'); |
| 223 | } |
| 224 | |
| 225 | if ($endDate !== null) { |
| 226 | $sql .= " AND r.redeemed_at <= :end_date"; |
| 227 | $params[':end_date'] = $endDate->format('Y-m-d H:i:s'); |
| 228 | } |
| 229 | |
| 230 | $sql .= " ORDER BY r.redeemed_at DESC"; |
| 231 | |
| 232 | $stmt = $this->db->prepare($sql); |
| 233 | $stmt->execute($params); |
| 234 | |
| 235 | $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); |
| 236 | $redemptions = []; |
| 237 | |
| 238 | foreach ($rows as $row) { |
| 239 | $redemptions[] = Redemption::fromRow($row); |
| 240 | } |
| 241 | |
| 242 | return $redemptions; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Normalize a coupon code for lookup |
| 247 | * |
| 248 | * - Trims whitespace |
| 249 | * - Converts to uppercase |
| 250 | * - Removes hyphens (display format is XXXX-XXXX) |
| 251 | * |
| 252 | * @param string $code Raw coupon code input |
| 253 | * @return string Normalized code |
| 254 | */ |
| 255 | private function normalizeCode(string $code): string |
| 256 | { |
| 257 | return strtoupper(str_replace('-', '', trim($code))); |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * Validate coupon status for redemption eligibility |
| 262 | * |
| 263 | * @param Coupon $coupon The coupon to validate |
| 264 | * @return array|null Error response if invalid, null if valid |
| 265 | */ |
| 266 | private function validateCouponStatus(Coupon $coupon): ?array |
| 267 | { |
| 268 | $status = $coupon->getStatus(); |
| 269 | |
| 270 | if ($status === Coupon::STATUS_REDEEMED) { |
| 271 | return [ |
| 272 | 'success' => false, |
| 273 | 'error' => 'Coupon already redeemed', |
| 274 | 'code' => 'ALREADY_REDEEMED' |
| 275 | ]; |
| 276 | } |
| 277 | |
| 278 | if ($status === Coupon::STATUS_EXPIRED) { |
| 279 | return [ |
| 280 | 'success' => false, |
| 281 | 'error' => 'Coupon expired', |
| 282 | 'code' => 'EXPIRED' |
| 283 | ]; |
| 284 | } |
| 285 | |
| 286 | if ($status === Coupon::STATUS_VOIDED) { |
| 287 | return [ |
| 288 | 'success' => false, |
| 289 | 'error' => 'Coupon has been voided', |
| 290 | 'code' => 'ALREADY_REDEEMED' |
| 291 | ]; |
| 292 | } |
| 293 | |
| 294 | if ($status !== Coupon::STATUS_ACTIVE) { |
| 295 | return [ |
| 296 | 'success' => false, |
| 297 | 'error' => 'Coupon is not active', |
| 298 | 'code' => 'INVALID_CODE' |
| 299 | ]; |
| 300 | } |
| 301 | |
| 302 | return null; |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * Insert a redemption audit record |
| 307 | * |
| 308 | * @param int $couponId Coupon being redeemed |
| 309 | * @param float $redeemedAmount Amount being redeemed |
| 310 | * @param string $transactionId POS transaction ID |
| 311 | * @param float $transactionAmount Transaction total |
| 312 | * @param int $employeeId Employee processing redemption |
| 313 | * @param string $redemptionMethod How coupon was presented |
| 314 | * @return int The inserted redemption ID |
| 315 | * @throws PDOException If insert fails |
| 316 | */ |
| 317 | private function insertRedemptionRecord( |
| 318 | int $couponId, |
| 319 | float $redeemedAmount, |
| 320 | string $transactionId, |
| 321 | float $transactionAmount, |
| 322 | int $employeeId, |
| 323 | string $redemptionMethod |
| 324 | ): int { |
| 325 | $sql = " |
| 326 | INSERT INTO ccRedemptions ( |
| 327 | coupon_id, |
| 328 | redeemed_amount, |
| 329 | transaction_id, |
| 330 | transaction_amount, |
| 331 | redeemed_by_employee_id, |
| 332 | redeemed_at, |
| 333 | redemption_method |
| 334 | ) VALUES ( |
| 335 | :coupon_id, |
| 336 | :redeemed_amount, |
| 337 | :transaction_id, |
| 338 | :transaction_amount, |
| 339 | :redeemed_by_employee_id, |
| 340 | NOW(), |
| 341 | :redemption_method |
| 342 | ) |
| 343 | "; |
| 344 | |
| 345 | $stmt = $this->db->prepare($sql); |
| 346 | |
| 347 | if ($stmt === false) { |
| 348 | throw new PDOException('Failed to prepare redemption insert statement'); |
| 349 | } |
| 350 | |
| 351 | $stmt->bindValue(':coupon_id', $couponId, PDO::PARAM_INT); |
| 352 | $stmt->bindValue(':redeemed_amount', $redeemedAmount); |
| 353 | $stmt->bindValue(':transaction_id', $transactionId); |
| 354 | $stmt->bindValue(':transaction_amount', $transactionAmount); |
| 355 | $stmt->bindValue(':redeemed_by_employee_id', $employeeId, PDO::PARAM_INT); |
| 356 | $stmt->bindValue(':redemption_method', $redemptionMethod); |
| 357 | |
| 358 | $result = $stmt->execute(); |
| 359 | |
| 360 | if (!$result) { |
| 361 | throw new PDOException('Failed to insert redemption record'); |
| 362 | } |
| 363 | |
| 364 | return (int) $this->db->lastInsertId(); |
| 365 | } |
| 366 | } |