CREATE TABLE IF NOT EXISTS payments (
    id CHAR(36) NOT NULL PRIMARY KEY,
    student_id CHAR(36) NOT NULL,
    payment_date DATE NOT NULL,
    amount_received DECIMAL(10, 2) NOT NULL,
    payment_method VARCHAR(50) NOT NULL CHECK (payment_method IN ('Cash', 'Bank Transfer', 'Mobile Money', 'Other')),
    reference_number VARCHAR(255) NULL,
    journal_entry_id CHAR(36) DEFAULT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
    FOREIGN KEY (student_id) REFERENCES students(id),
    FOREIGN KEY (journal_entry_id) REFERENCES journal_entries(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS payment_lines (
    id CHAR(36) NOT NULL PRIMARY KEY,
    payment_id CHAR(36) NOT NULL,
    invoice_id CHAR(36) NOT NULL,
    amount_applied DECIMAL(10, 2) NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
    FOREIGN KEY (payment_id) REFERENCES payments(id) ON DELETE CASCADE,
    FOREIGN KEY (invoice_id) REFERENCES invoices(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;