-- =====================================================
-- ORBIQUANT IA - REFUNDS TABLE
-- =====================================================
-- Description: Registro de reembolsos para compliance
-- Schema: financial
-- Gap: GAP-DDL-004
-- Created: 2026-02-03
-- =====================================================

CREATE TABLE financial.refunds (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  -- Relacion con pago original
  payment_id UUID NOT NULL REFERENCES financial.payments(id) ON DELETE RESTRICT,

  -- Monto y moneda
  amount DECIMAL(20,8) NOT NULL CHECK (amount > 0),
  currency financial.currency_code NOT NULL,

  -- Razon y metadata
  reason VARCHAR(255) NOT NULL,
  reason_code VARCHAR(50), -- e.g., 'duplicate', 'fraudulent', 'requested_by_customer'
  notes TEXT,

  -- Estado
  status financial.payment_status NOT NULL DEFAULT 'pending',

  -- Stripe integration
  stripe_refund_id VARCHAR(255) UNIQUE,
  stripe_failure_reason TEXT,

  -- Aprobacion
  requested_by UUID REFERENCES auth.users(id),
  approved_by UUID REFERENCES auth.users(id),
  approved_at TIMESTAMPTZ,
  rejected_at TIMESTAMPTZ,
  rejection_reason TEXT,

  -- Metadata
  metadata JSONB DEFAULT '{}',

  -- Timestamps
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  processed_at TIMESTAMPTZ,
  completed_at TIMESTAMPTZ,
  failed_at TIMESTAMPTZ,

  -- Constraints
  CONSTRAINT refund_approval_valid CHECK (
    (status = 'succeeded' AND approved_by IS NOT NULL AND approved_at IS NOT NULL) OR
    (status != 'succeeded')
  ),
  CONSTRAINT refund_failure_valid CHECK (
    (status = 'failed' AND failed_at IS NOT NULL) OR
    (status != 'failed')
  )
);

-- Indices
CREATE INDEX idx_refunds_payment ON financial.refunds(payment_id);
CREATE INDEX idx_refunds_status ON financial.refunds(status);
CREATE INDEX idx_refunds_stripe ON financial.refunds(stripe_refund_id)
  WHERE stripe_refund_id IS NOT NULL;
CREATE INDEX idx_refunds_created ON financial.refunds(created_at DESC);
CREATE INDEX idx_refunds_requested_by ON financial.refunds(requested_by)
  WHERE requested_by IS NOT NULL;

-- Comentarios
COMMENT ON TABLE financial.refunds IS 'Registro de reembolsos para compliance y tracking';
COMMENT ON COLUMN financial.refunds.payment_id IS 'Pago original que se esta reembolsando';
COMMENT ON COLUMN financial.refunds.reason_code IS 'Codigo de razon: duplicate, fraudulent, requested_by_customer, etc.';
COMMENT ON COLUMN financial.refunds.stripe_refund_id IS 'ID del refund en Stripe';
COMMENT ON COLUMN financial.refunds.requested_by IS 'Usuario que solicito el reembolso';
COMMENT ON COLUMN financial.refunds.approved_by IS 'Admin que aprobo el reembolso';