-- ============================================
-- SIMPLE REFERRAL SYSTEM SETUP
-- No INFORMATION_SCHEMA queries - works with limited permissions
-- ============================================

-- Step 1: Add referralCode column to users table
-- If column exists, you'll get an error - that's OK, just continue
ALTER TABLE `users` 
ADD COLUMN `referralCode` VARCHAR(50) NULL UNIQUE AFTER `contactNumber`;

-- Step 2: Add referredByCode column to users table
-- If column exists, you'll get an error - that's OK, just continue
ALTER TABLE `users` 
ADD COLUMN `referredByCode` VARCHAR(50) NULL AFTER `referralCode`;

-- Step 3: Add indexes (if they don't exist, you may get errors - that's OK)
ALTER TABLE `users` 
ADD INDEX `idx_referral_code` (`referralCode`);

ALTER TABLE `users` 
ADD INDEX `idx_referred_by_code` (`referredByCode`);

-- Step 4: Create referrals table
-- NOTE: referralCode is NOT UNIQUE - same code can be used by multiple people
CREATE TABLE IF NOT EXISTS `referrals` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `referrerId` INT NOT NULL,
  `referrerType` ENUM('customer', 'supplier') NOT NULL,
  `referredCustomerId` INT NOT NULL,
  `referralCode` VARCHAR(50) NOT NULL,
  `status` ENUM('pending', 'active', 'completed', 'cancelled') DEFAULT 'pending',
  `totalEarnings` DECIMAL(10, 2) DEFAULT 0,
  `totalOrders` INT DEFAULT 0,
  `totalOrderValue` DECIMAL(10, 2) DEFAULT 0,
  `commissionRate` DECIMAL(5, 2) DEFAULT 0,
  `firstOrderCompleted` BOOLEAN DEFAULT FALSE,
  `firstOrderRewardPaid` BOOLEAN DEFAULT FALSE,
  `createdAt` DATETIME DEFAULT CURRENT_TIMESTAMP,
  `updatedAt` DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `idx_referrer` (`referrerId`),
  INDEX `idx_referred_customer` (`referredCustomerId`),
  INDEX `idx_referral_code` (`referralCode`),
  FOREIGN KEY (`referrerId`) REFERENCES `users`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`referredCustomerId`) REFERENCES `users`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Step 5: Create referral_rewards table
CREATE TABLE IF NOT EXISTS `referral_rewards` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `referralId` INT NOT NULL,
  `orderId` INT NULL,
  `rewardType` ENUM('first_order', 'commission', 'bonus') NOT NULL,
  `orderAmount` DECIMAL(10, 2) NOT NULL,
  `commissionRate` DECIMAL(5, 2) NOT NULL,
  `rewardAmount` DECIMAL(10, 2) NOT NULL,
  `status` ENUM('pending', 'paid', 'cancelled') DEFAULT 'pending',
  `paidAt` DATETIME NULL,
  `paidToWallet` BOOLEAN DEFAULT FALSE,
  `notes` TEXT NULL,
  `createdAt` DATETIME DEFAULT CURRENT_TIMESTAMP,
  `updatedAt` DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `idx_referral` (`referralId`),
  INDEX `idx_order` (`orderId`),
  INDEX `idx_status` (`status`),
  FOREIGN KEY (`referralId`) REFERENCES `referrals`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`orderId`) REFERENCES `orders`(`id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Step 6: Verify (simple checks)
SHOW TABLES LIKE 'referrals';
SHOW TABLES LIKE 'referral_rewards';
SHOW COLUMNS FROM `users` LIKE 'referralCode';
SHOW COLUMNS FROM `users` LIKE 'referredByCode';