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| 1 | <?php |
| 2 | |
| 3 | namespace BuyerKiosk\ComebackCash\Services; |
| 4 | |
| 5 | use PDO; |
| 6 | use DateTime; |
| 7 | use BuyerKiosk\ComebackCash\Models\Coupon; |
| 8 | use BuyerKiosk\ComebackCash\Models\Event; |
| 9 | |
| 10 | /** |
| 11 | * CouponService - Handles coupon issuance, validation, and lookup |
| 12 | * |
| 13 | * This service implements the coupon issuance flow per SDD lines 989-1026: |
| 14 | * 1. Customer completes transaction at POS |
| 15 | * 2. POS sends transaction details to Comeback Cash API |
| 16 | * 3. System checks for active event on matching side (buy/sales) |
| 17 | * 4. System calculates reward based on event configuration |
| 18 | * 5. If qualified, system generates coupon and returns details |
| 19 | * 6. If customer phone provided, SMS notification is queued |
| 20 | * |
| 21 | * Business Rules: |
| 22 | * - Rule 16: Buy-side has NO earning thresholds - any completed buy earns flat coupon |
| 23 | * - Rule 15: Sales-side thresholds on net amount AFTER discounts |
| 24 | * - Rule 12: Coupons are bearer instruments - anyone with code can redeem |
| 25 | * |
| 26 | * @package BuyerKiosk\ComebackCash\Services |
| 27 | */ |
| 28 | class CouponService |
| 29 | { |
| 30 | /** |
| 31 | * Default number of days coupons are valid |
| 32 | */ |
| 33 | private const DEFAULT_DAYS_VALID = 30; |
| 34 | |
| 35 | /** |
| 36 | * @var PDO Database connection |
| 37 | */ |
| 38 | private PDO $db; |
| 39 | |
| 40 | /** |
| 41 | * @var EventService Event service for finding active events |
| 42 | */ |
| 43 | private EventService $eventService; |
| 44 | |
| 45 | /** |
| 46 | * @var SmsQueueInterface|null SMS queue for notifications |
| 47 | */ |
| 48 | private ?SmsQueueInterface $smsQueue; |
| 49 | |
| 50 | /** |
| 51 | * Create a new CouponService instance |
| 52 | * |
| 53 | * @param PDO $db Database connection |
| 54 | * @param EventService $eventService Event service for finding active events |
| 55 | * @param SmsQueueInterface|null $smsQueue Optional SMS queue for notifications |
| 56 | */ |
| 57 | public function __construct(PDO $db, EventService $eventService, ?SmsQueueInterface $smsQueue = null) |
| 58 | { |
| 59 | $this->db = $db; |
| 60 | $this->eventService = $eventService; |
| 61 | $this->smsQueue = $smsQueue; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Issue a coupon for a qualifying transaction |
| 66 | * |
| 67 | * This method is idempotent - duplicate transaction_ids return the existing coupon. |
| 68 | * |
| 69 | * @param string $side Transaction side: 'buy' or 'sales' |
| 70 | * @param string $transactionId Unique transaction identifier |
| 71 | * @param float $transactionAmount Transaction amount (net, after discounts) |
| 72 | * @param string|null $customerPhone Customer phone for SMS notification |
| 73 | * @param string|null $customerName Customer name for personalization |
| 74 | * @param int|null $employeeId Employee who processed the transaction |
| 75 | * @return array Result array with success, coupon data, or error info |
| 76 | */ |
| 77 | public function issueCoupon( |
| 78 | string $side, |
| 79 | string $transactionId, |
| 80 | float $transactionAmount, |
| 81 | ?string $customerPhone = null, |
| 82 | ?string $customerName = null, |
| 83 | ?int $employeeId = null |
| 84 | ): array { |
| 85 | // Validate side parameter |
| 86 | if (!in_array($side, [Event::SIDE_BUY, Event::SIDE_SALES], true)) { |
| 87 | return [ |
| 88 | 'success' => false, |
| 89 | 'error' => 'Invalid transaction side', |
| 90 | 'code' => 'INVALID_SIDE', |
| 91 | ]; |
| 92 | } |
| 93 | |
| 94 | // Reject negative transaction amounts |
| 95 | if ($transactionAmount < 0) { |
| 96 | return [ |
| 97 | 'success' => false, |
| 98 | 'error' => 'Transaction amount cannot be negative', |
| 99 | 'code' => 'INVALID_AMOUNT', |
| 100 | ]; |
| 101 | } |
| 102 | |
| 103 | // Check for active event on this side |
| 104 | $event = $this->eventService->getActiveEventBySide($side); |
| 105 | if ($event === null) { |
| 106 | return [ |
| 107 | 'success' => false, |
| 108 | 'error' => "No active event for {$side} side", |
| 109 | 'code' => 'NO_ACTIVE_EVENT', |
| 110 | ]; |
| 111 | } |
| 112 | |
| 113 | // Calculate reward based on event configuration FIRST |
| 114 | // This allows early return for non-qualifying transactions without DB queries |
| 115 | $rewardAmount = $event->calculateReward($transactionAmount); |
| 116 | |
| 117 | // For sales-side, null reward means below threshold - return early |
| 118 | if ($rewardAmount === null) { |
| 119 | return [ |
| 120 | 'success' => true, |
| 121 | 'coupon' => null, |
| 122 | 'reason' => 'Amount below minimum threshold', |
| 123 | ]; |
| 124 | } |
| 125 | |
| 126 | // Check for duplicate transaction (idempotency) - only for qualifying transactions |
| 127 | $existingCoupon = $this->findCouponByTransactionId($transactionId); |
| 128 | if ($existingCoupon !== null) { |
| 129 | // Return existing coupon without queueing another SMS |
| 130 | return [ |
| 131 | 'success' => true, |
| 132 | 'coupon' => $this->formatCouponResponse($existingCoupon, $event), |
| 133 | ]; |
| 134 | } |
| 135 | |
| 136 | // Generate unique coupon code |
| 137 | $code = Coupon::generateCode(); |
| 138 | |
| 139 | // Calculate expiration date |
| 140 | $daysValid = $event->redemptionDaysValid ?? self::DEFAULT_DAYS_VALID; |
| 141 | $expiresAt = new DateTime("+{$daysValid} days"); |
| 142 | |
| 143 | // Insert the coupon |
| 144 | $couponId = $this->insertCoupon( |
| 145 | eventId: $event->id, |
| 146 | code: $code, |
| 147 | value: $rewardAmount, |
| 148 | transactionId: $transactionId, |
| 149 | transactionAmount: $transactionAmount, |
| 150 | customerPhone: $customerPhone, |
| 151 | customerName: $customerName, |
| 152 | expiresAt: $expiresAt, |
| 153 | employeeId: $employeeId |
| 154 | ); |
| 155 | |
| 156 | // Build coupon response |
| 157 | $couponData = [ |
| 158 | 'id' => $couponId, |
| 159 | 'code' => $code, |
| 160 | 'value' => $rewardAmount, |
| 161 | 'expires_at' => $expiresAt->format('Y-m-d H:i:s'), |
| 162 | 'event_name' => $event->name, |
| 163 | 'display_code' => $this->formatDisplayCode($code), |
| 164 | ]; |
| 165 | |
| 166 | // Queue SMS notification if appropriate |
| 167 | if ($this->shouldQueueSms($customerPhone, $event)) { |
| 168 | $this->smsQueue->queueCouponNotification($customerPhone, $couponData, $event); |
| 169 | } |
| 170 | |
| 171 | return [ |
| 172 | 'success' => true, |
| 173 | 'coupon' => $couponData, |
| 174 | ]; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Validate a coupon code |
| 179 | * |
| 180 | * Checks if the coupon exists and is currently redeemable. |
| 181 | * |
| 182 | * @param string $code Coupon code (case-insensitive, hyphens ignored) |
| 183 | * @return array Validation result with valid flag, status, and optional error |
| 184 | */ |
| 185 | public function validateCoupon(string $code): array |
| 186 | { |
| 187 | $normalizedCode = $this->normalizeCode($code); |
| 188 | |
| 189 | $sql = "SELECT c.*, e.name as event_name, e.redemption_min_purchase |
| 190 | FROM ccCoupons c |
| 191 | JOIN ccEvents e ON c.event_id = e.id |
| 192 | WHERE c.code = ?"; |
| 193 | |
| 194 | $stmt = $this->db->prepare($sql); |
| 195 | $stmt->execute([$normalizedCode]); |
| 196 | $row = $stmt->fetch(PDO::FETCH_ASSOC); |
| 197 | |
| 198 | if ($row === false) { |
| 199 | return [ |
| 200 | 'valid' => false, |
| 201 | 'status' => 'not_found', |
| 202 | 'reason' => 'Coupon not found', |
| 203 | ]; |
| 204 | } |
| 205 | |
| 206 | $coupon = Coupon::fromRow($row); |
| 207 | |
| 208 | // Check if expired by date (even if status is still 'active') |
| 209 | if ($coupon->isExpired()) { |
| 210 | return [ |
| 211 | 'valid' => false, |
| 212 | 'status' => 'expired', |
| 213 | 'reason' => 'Coupon has expired', |
| 214 | 'coupon' => $this->formatCouponFromRow($row), |
| 215 | ]; |
| 216 | } |
| 217 | |
| 218 | // Check status |
| 219 | switch ($coupon->getStatus()) { |
| 220 | case Coupon::STATUS_ACTIVE: |
| 221 | return [ |
| 222 | 'valid' => true, |
| 223 | 'status' => 'active', |
| 224 | 'coupon' => $this->formatCouponFromRow($row), |
| 225 | ]; |
| 226 | |
| 227 | case Coupon::STATUS_REDEEMED: |
| 228 | return [ |
| 229 | 'valid' => false, |
| 230 | 'status' => 'redeemed', |
| 231 | 'reason' => 'Coupon has already been redeemed', |
| 232 | 'coupon' => $this->formatCouponFromRow($row), |
| 233 | ]; |
| 234 | |
| 235 | case Coupon::STATUS_EXPIRED: |
| 236 | return [ |
| 237 | 'valid' => false, |
| 238 | 'status' => 'expired', |
| 239 | 'reason' => 'Coupon has expired', |
| 240 | 'coupon' => $this->formatCouponFromRow($row), |
| 241 | ]; |
| 242 | |
| 243 | case Coupon::STATUS_VOIDED: |
| 244 | return [ |
| 245 | 'valid' => false, |
| 246 | 'status' => 'voided', |
| 247 | 'reason' => 'Coupon has been voided', |
| 248 | 'coupon' => $this->formatCouponFromRow($row), |
| 249 | ]; |
| 250 | |
| 251 | default: |
| 252 | return [ |
| 253 | 'valid' => false, |
| 254 | 'status' => $coupon->getStatus(), |
| 255 | 'reason' => 'Coupon is not redeemable', |
| 256 | 'coupon' => $this->formatCouponFromRow($row), |
| 257 | ]; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Get coupon by code with event details |
| 263 | * |
| 264 | * @param string $code Coupon code (case-insensitive, hyphens ignored) |
| 265 | * @return array|null Coupon and event data, or null if not found |
| 266 | */ |
| 267 | public function getCouponByCode(string $code): ?array |
| 268 | { |
| 269 | $normalizedCode = $this->normalizeCode($code); |
| 270 | |
| 271 | $sql = "SELECT c.*, |
| 272 | e.name as event_name, |
| 273 | e.side as event_side, |
| 274 | e.redemption_min_purchase |
| 275 | FROM ccCoupons c |
| 276 | JOIN ccEvents e ON c.event_id = e.id |
| 277 | WHERE c.code = ?"; |
| 278 | |
| 279 | $stmt = $this->db->prepare($sql); |
| 280 | $stmt->execute([$normalizedCode]); |
| 281 | $row = $stmt->fetch(PDO::FETCH_ASSOC); |
| 282 | |
| 283 | if ($row === false) { |
| 284 | return null; |
| 285 | } |
| 286 | |
| 287 | return [ |
| 288 | 'coupon' => $this->formatCouponFromRow($row), |
| 289 | 'event' => [ |
| 290 | 'id' => (int) $row['event_id'], |
| 291 | 'name' => $row['event_name'], |
| 292 | 'side' => $row['event_side'] ?? null, |
| 293 | 'redemption_min_purchase' => isset($row['redemption_min_purchase']) |
| 294 | ? (float) $row['redemption_min_purchase'] |
| 295 | : null, |
| 296 | ], |
| 297 | ]; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Find an existing coupon by source transaction ID |
| 302 | * |
| 303 | * @param string $transactionId The source transaction ID |
| 304 | * @return array|null Coupon row data or null if not found |
| 305 | */ |
| 306 | private function findCouponByTransactionId(string $transactionId): ?array |
| 307 | { |
| 308 | $sql = "SELECT * FROM ccCoupons WHERE source_transaction_id = ?"; |
| 309 | $stmt = $this->db->prepare($sql); |
| 310 | $stmt->execute([$transactionId]); |
| 311 | $row = $stmt->fetch(PDO::FETCH_ASSOC); |
| 312 | |
| 313 | return $row !== false ? $row : null; |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Insert a new coupon record |
| 318 | * |
| 319 | * @param int $eventId Event ID |
| 320 | * @param string $code Coupon code |
| 321 | * @param float $value Coupon value |
| 322 | * @param string $transactionId Source transaction ID |
| 323 | * @param float $transactionAmount Source transaction amount |
| 324 | * @param string|null $customerPhone Customer phone |
| 325 | * @param string|null $customerName Customer name |
| 326 | * @param DateTime $expiresAt Expiration date |
| 327 | * @param int|null $employeeId Issuing employee ID |
| 328 | * @return int The inserted coupon ID |
| 329 | */ |
| 330 | private function insertCoupon( |
| 331 | int $eventId, |
| 332 | string $code, |
| 333 | float $value, |
| 334 | string $transactionId, |
| 335 | float $transactionAmount, |
| 336 | ?string $customerPhone, |
| 337 | ?string $customerName, |
| 338 | DateTime $expiresAt, |
| 339 | ?int $employeeId |
| 340 | ): int { |
| 341 | $sql = "INSERT INTO ccCoupons ( |
| 342 | event_id, |
| 343 | code, |
| 344 | value, |
| 345 | original_value, |
| 346 | source_transaction_id, |
| 347 | source_transaction_amount, |
| 348 | customer_phone, |
| 349 | customer_name, |
| 350 | status, |
| 351 | expires_at, |
| 352 | issued_at, |
| 353 | issued_by_employee_id |
| 354 | ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NOW(), ?)"; |
| 355 | |
| 356 | $stmt = $this->db->prepare($sql); |
| 357 | $stmt->execute([ |
| 358 | $eventId, |
| 359 | $code, |
| 360 | $value, |
| 361 | $value, // original_value same as value at issuance |
| 362 | $transactionId, |
| 363 | $transactionAmount, |
| 364 | $customerPhone, |
| 365 | $customerName, |
| 366 | Coupon::STATUS_ACTIVE, |
| 367 | $expiresAt->format('Y-m-d H:i:s'), |
| 368 | $employeeId, |
| 369 | ]); |
| 370 | |
| 371 | return (int) $this->db->lastInsertId(); |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * Determine if SMS should be queued |
| 376 | * |
| 377 | * SMS is queued only when: |
| 378 | * 1. Phone number is provided and not empty |
| 379 | * 2. Event has SMS enabled |
| 380 | * 3. SMS queue service is available |
| 381 | * |
| 382 | * @param string|null $customerPhone Customer phone number |
| 383 | * @param Event $event The event configuration |
| 384 | * @return bool Whether to queue SMS |
| 385 | */ |
| 386 | private function shouldQueueSms(?string $customerPhone, Event $event): bool |
| 387 | { |
| 388 | return $customerPhone !== null |
| 389 | && $customerPhone !== '' |
| 390 | && $event->smsEnabled |
| 391 | && $this->smsQueue !== null; |
| 392 | } |
| 393 | |
| 394 | /** |
| 395 | * Normalize a coupon code for lookup |
| 396 | * |
| 397 | * Converts to uppercase and removes hyphens for consistent matching. |
| 398 | * |
| 399 | * @param string $code Raw coupon code |
| 400 | * @return string Normalized code |
| 401 | */ |
| 402 | private function normalizeCode(string $code): string |
| 403 | { |
| 404 | return strtoupper(str_replace('-', '', $code)); |
| 405 | } |
| 406 | |
| 407 | /** |
| 408 | * Format code for display (XXXX-XXXX) |
| 409 | * |
| 410 | * @param string $code 8-character code |
| 411 | * @return string Formatted code with hyphen |
| 412 | */ |
| 413 | private function formatDisplayCode(string $code): string |
| 414 | { |
| 415 | if (strlen($code) === 8) { |
| 416 | return substr($code, 0, 4) . '-' . substr($code, 4, 4); |
| 417 | } |
| 418 | return $code; |
| 419 | } |
| 420 | |
| 421 | /** |
| 422 | * Format coupon response from existing coupon row and event |
| 423 | * |
| 424 | * @param array $couponRow Database row |
| 425 | * @param Event $event Event model |
| 426 | * @return array Formatted coupon data |
| 427 | */ |
| 428 | private function formatCouponResponse(array $couponRow, Event $event): array |
| 429 | { |
| 430 | return [ |
| 431 | 'id' => (int) $couponRow['id'], |
| 432 | 'code' => $couponRow['code'], |
| 433 | 'value' => (float) $couponRow['value'], |
| 434 | 'expires_at' => $couponRow['expires_at'], |
| 435 | 'event_name' => $event->name, |
| 436 | 'display_code' => $this->formatDisplayCode($couponRow['code']), |
| 437 | ]; |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Format coupon data from database row |
| 442 | * |
| 443 | * @param array $row Database row |
| 444 | * @return array Formatted coupon data |
| 445 | */ |
| 446 | private function formatCouponFromRow(array $row): array |
| 447 | { |
| 448 | return [ |
| 449 | 'id' => (int) $row['id'], |
| 450 | 'code' => $row['code'], |
| 451 | 'value' => (float) $row['value'], |
| 452 | 'original_value' => (float) $row['original_value'], |
| 453 | 'status' => $row['status'], |
| 454 | 'expires_at' => $row['expires_at'], |
| 455 | 'issued_at' => $row['issued_at'], |
| 456 | 'source_transaction_id' => $row['source_transaction_id'], |
| 457 | 'source_transaction_amount' => (float) $row['source_transaction_amount'], |
| 458 | 'customer_phone' => $row['customer_phone'] ?? null, |
| 459 | 'customer_name' => $row['customer_name'] ?? null, |
| 460 | 'display_code' => $this->formatDisplayCode($row['code']), |
| 461 | 'event_name' => $row['event_name'] ?? null, |
| 462 | 'redemption_min_purchase' => isset($row['redemption_min_purchase']) |
| 463 | ? (float) $row['redemption_min_purchase'] |
| 464 | : null, |
| 465 | ]; |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * Find a coupon by its code |
| 470 | * |
| 471 | * Used by RedemptionService for coupon lookup during redemption. |
| 472 | * |
| 473 | * @param string $code Coupon code (case-insensitive, hyphens ignored) |
| 474 | * @return Coupon|null The Coupon model or null if not found |
| 475 | */ |
| 476 | public function findByCode(string $code): ?Coupon |
| 477 | { |
| 478 | $normalizedCode = $this->normalizeCode($code); |
| 479 | |
| 480 | $sql = "SELECT c.*, e.name as event_name, e.redemption_min_purchase |
| 481 | FROM ccCoupons c |
| 482 | JOIN ccEvents e ON c.event_id = e.id |
| 483 | WHERE c.code = ?"; |
| 484 | |
| 485 | $stmt = $this->db->prepare($sql); |
| 486 | $stmt->execute([$normalizedCode]); |
| 487 | $row = $stmt->fetch(PDO::FETCH_ASSOC); |
| 488 | |
| 489 | if ($row === false) { |
| 490 | return null; |
| 491 | } |
| 492 | |
| 493 | return Coupon::fromRow($row); |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * Get the minimum purchase requirement for an event |
| 498 | * |
| 499 | * Used by RedemptionService to validate transaction meets minimum. |
| 500 | * |
| 501 | * @param int $eventId The event ID |
| 502 | * @return float The minimum purchase amount (0 if not set) |
| 503 | */ |
| 504 | public function getMinimumPurchaseForEvent(int $eventId): float |
| 505 | { |
| 506 | $sql = "SELECT redemption_min_purchase FROM ccEvents WHERE id = ?"; |
| 507 | $stmt = $this->db->prepare($sql); |
| 508 | $stmt->execute([$eventId]); |
| 509 | $row = $stmt->fetch(PDO::FETCH_ASSOC); |
| 510 | |
| 511 | if ($row === false || $row['redemption_min_purchase'] === null) { |
| 512 | return 0.0; |
| 513 | } |
| 514 | |
| 515 | return (float) $row['redemption_min_purchase']; |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * Update coupon status and value after redemption |
| 520 | * |
| 521 | * Used by RedemptionService during the redemption transaction. |
| 522 | * |
| 523 | * @param int $couponId The coupon ID to update |
| 524 | * @param string $status New status (active, redeemed, expired, voided) |
| 525 | * @param float $remainingValue New remaining value |
| 526 | * @return bool True if update was successful |
| 527 | */ |
| 528 | public function updateCouponStatus(int $couponId, string $status, float $remainingValue): bool |
| 529 | { |
| 530 | $sql = "UPDATE ccCoupons |
| 531 | SET value = ?, status = ?, updated_at = NOW() |
| 532 | WHERE id = ?"; |
| 533 | |
| 534 | $stmt = $this->db->prepare($sql); |
| 535 | return $stmt->execute([$remainingValue, $status, $couponId]); |
| 536 | } |
| 537 | } |