-- Add price and currency to courses table in LMS
ALTER TABLE courses ADD COLUMN price NUMERIC(10, 2) DEFAULT 0.00;
ALTER TABLE courses ADD COLUMN currency VARCHAR(10) DEFAULT 'USD';

-- Create transactions table
CREATE TABLE transactions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    organization_id UUID NOT NULL REFERENCES organizations(id),
    user_id UUID NOT NULL REFERENCES users(id),
    course_id UUID NOT NULL REFERENCES courses(id),
    amount NUMERIC(10, 2) NOT NULL,
    currency VARCHAR(10) NOT NULL,
    status TEXT NOT NULL DEFAULT 'pending', -- 'pending', 'success', 'failure'
    provider_reference TEXT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Trigger for updated_at in transactions
CREATE TRIGGER set_timestamp_transactions
BEFORE UPDATE ON transactions
FOR EACH ROW
EXECUTE PROCEDURE trigger_set_timestamp();