-- Held Carts Table
CREATE TABLE IF NOT EXISTS pos_held_carts (
    id INT AUTO_INCREMENT PRIMARY KEY,
    cart_name VARCHAR(100) NOT NULL,
    items_json TEXT NOT NULL,
    customer_id INT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (customer_id) REFERENCES customers(id) ON DELETE SET NULL
);

-- Discount Codes Table
CREATE TABLE IF NOT EXISTS discount_codes (
    id INT AUTO_INCREMENT PRIMARY KEY,
    code VARCHAR(50) UNIQUE NOT NULL,
    type ENUM('percentage', 'fixed') NOT NULL DEFAULT 'percentage',
    value DECIMAL(15, 3) NOT NULL,
    min_purchase DECIMAL(15, 3) DEFAULT 0.000,
    expiry_date DATE NULL,
    status ENUM('active', 'inactive') DEFAULT 'active',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Update Customers for Loyalty Points
-- Check if column exists first (handled by IF NOT EXISTS in some dialects, but let's be safe for MySQL 5.7/MariaDB)
-- Using a procedure or just trying it. MySQL 8.0/MariaDB supports IF NOT EXISTS for ADD COLUMN but older versions don't always.
-- For this VM, we can just run it.

ALTER TABLE customers ADD COLUMN IF NOT EXISTS loyalty_points DECIMAL(15, 3) DEFAULT 0.000;

-- Update POS Transactions for Discounts and Loyalty
ALTER TABLE pos_transactions 
    ADD COLUMN IF NOT EXISTS discount_code_id INT NULL,
    ADD COLUMN IF NOT EXISTS discount_amount DECIMAL(15, 3) DEFAULT 0.000,
    ADD COLUMN IF NOT EXISTS loyalty_points_earned DECIMAL(15, 3) DEFAULT 0.000,
    ADD COLUMN IF NOT EXISTS loyalty_points_redeemed DECIMAL(15, 3) DEFAULT 0.000,
    ADD COLUMN IF NOT EXISTS net_amount DECIMAL(15, 3) NOT NULL DEFAULT 0.000;

-- Adding foreign key separately to be safe
-- ALTER TABLE pos_transactions ADD FOREIGN KEY (discount_code_id) REFERENCES discount_codes(id) ON DELETE SET NULL;

-- Insert some dummy discount codes
INSERT IGNORE INTO discount_codes (code, type, value, min_purchase) VALUES 
('WELCOME10', 'percentage', 10.000, 0.000),
('SAVE5', 'fixed', 5.000, 50.000);