-- Migration to add Invoice functionality
-- Run this on your existing database

-- Create invoices table
CREATE TABLE IF NOT EXISTS invoices (
    id SERIAL PRIMARY KEY,
    invoice_number VARCHAR(50) UNIQUE NOT NULL,
    customer_id INTEGER REFERENCES customers(id),
    invoice_date DATE NOT NULL,
    terms VARCHAR(100) DEFAULT 'Net 30',
    auth_code VARCHAR(255),
    tax_exempt BOOLEAN DEFAULT FALSE,
    tax_rate DECIMAL(5,2) DEFAULT 8.25,
    subtotal DECIMAL(10,2) DEFAULT 0,
    tax_amount DECIMAL(10,2) DEFAULT 0,
    total DECIMAL(10,2) DEFAULT 0,
    created_from_quote_id INTEGER REFERENCES quotes(id),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Create invoice_items table
CREATE TABLE IF NOT EXISTS invoice_items (
    id SERIAL PRIMARY KEY,
    invoice_id INTEGER REFERENCES invoices(id) ON DELETE CASCADE,
    quantity VARCHAR(20) NOT NULL,
    description TEXT NOT NULL,
    rate VARCHAR(50) NOT NULL,
    amount VARCHAR(50) NOT NULL,
    item_order INTEGER NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Create indexes
CREATE INDEX IF NOT EXISTS idx_invoices_invoice_number ON invoices(invoice_number);
CREATE INDEX IF NOT EXISTS idx_invoices_customer_id ON invoices(customer_id);
CREATE INDEX IF NOT EXISTS idx_invoice_items_invoice_id ON invoice_items(invoice_id);
CREATE INDEX IF NOT EXISTS idx_invoices_created_from_quote ON invoices(created_from_quote_id);