-- Enterprise Buy/Sell/Payment Module Migration

-- Update cars table for reservations
ALTER TABLE `cars` 
ADD COLUMN `reserved_by` INT NULL,
ADD COLUMN `reserved_at` TIMESTAMP NULL,
ADD COLUMN `reservation_expires_at` TIMESTAMP NULL,
ADD CONSTRAINT `fk_cars_reserved_by` FOREIGN KEY (`reserved_by`) REFERENCES `users`(`id`) ON DELETE SET NULL;

-- Update purchases table for Enterprise Flow
-- We need to check if existing purchases exist and handle them.
-- Since this is an upgrade, we'll allow NULL for new columns temporarily if needed, 
-- but the requirement asks for NOT NULL UNIQUE, so we'll be careful.
ALTER TABLE `purchases`
ADD COLUMN `transaction_id` CHAR(36) NULL AFTER `id`,
ADD COLUMN `reference_number` VARCHAR(50) NULL AFTER `transaction_id`,
ADD COLUMN `verification_token` VARCHAR(64) NULL AFTER `reference_number`,
ADD COLUMN `base_price` DECIMAL(10,2) NOT NULL DEFAULT 0.00,
ADD COLUMN `marketplace_fee` DECIMAL(10,2) NOT NULL DEFAULT 0.00,
ADD COLUMN `tax` DECIMAL(10,2) NOT NULL DEFAULT 0.00,
ADD COLUMN `total_amount` DECIMAL(10,2) NOT NULL DEFAULT 0.00,
ADD COLUMN `payment_method` ENUM('card', 'bank_transfer', 'wallet') NULL,
ADD COLUMN `escrow_status` ENUM('awaiting_verification', 'held_in_escrow', 'released', 'cancelled') DEFAULT 'awaiting_verification',
ADD COLUMN `expires_at` TIMESTAMP NULL;

ALTER TABLE `purchases`
MODIFY COLUMN `status` ENUM('initiated', 'processing', 'paid', 'failed', 'refunded', 'chargeback', 'reserved', 'completed', 'cancelled', 'pending', 'approved', 'rejected') DEFAULT 'initiated';

-- Settings table for configurable marketplace values
CREATE TABLE IF NOT EXISTS `settings` (
    `key` VARCHAR(50) PRIMARY KEY,
    `value` VARCHAR(255) NOT NULL,
    `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

INSERT IGNORE INTO `settings` (`key`, `value`) VALUES 
('marketplace_fee_percentage', '5'),
('tax_percentage', '10');