-- v4.4 Workshop Lite
-- Extends service orders with inventory reservation, sale linking and a labor catalog.

-- ═════════════════════════════════════════════════════════════════════════════
-- 1. SERVICE_ORDERS: link to the sale generated from the order
-- ═════════════════════════════════════════════════════════════════════════════
ALTER TABLE service_orders
    ADD COLUMN IF NOT EXISTS sale_id INTEGER REFERENCES sales(id);

COMMENT ON COLUMN service_orders.sale_id IS 'Sale/invoice generated from this service order';

CREATE INDEX IF NOT EXISTS idx_service_orders_sale_id ON service_orders(sale_id);

-- ═════════════════════════════════════════════════════════════════════════════
-- 2. SERVICE_CATALOG: reusable labor/work concepts for mechanics
-- ═════════════════════════════════════════════════════════════════════════════
CREATE TABLE IF NOT EXISTS service_catalog (
    id SERIAL PRIMARY KEY,
    tenant_id INTEGER NOT NULL,
    name VARCHAR(200) NOT NULL,
    description TEXT,
    suggested_hours NUMERIC(6,2) DEFAULT 0,
    suggested_rate NUMERIC(12,2) DEFAULT 0,
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_service_catalog_tenant ON service_catalog(tenant_id);
CREATE INDEX IF NOT EXISTS idx_service_catalog_active ON service_catalog(is_active);

COMMENT ON TABLE service_catalog IS 'Reusable labor concepts for workshop service orders';

-- Trigger to auto-update updated_at on service_catalog
CREATE OR REPLACE FUNCTION update_service_catalog_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS trg_service_catalog_updated_at ON service_catalog;
CREATE TRIGGER trg_service_catalog_updated_at
    BEFORE UPDATE ON service_catalog
    FOR EACH ROW
    EXECUTE FUNCTION update_service_catalog_updated_at();

-- ═════════════════════════════════════════════════════════════════════════════
-- 3. SERVICE_ORDER_ITEMS: track reserved quantity separately
-- ═════════════════════════════════════════════════════════════════════════════
ALTER TABLE service_order_items
    ADD COLUMN IF NOT EXISTS reserved_quantity NUMERIC(10,2) DEFAULT 0;

COMMENT ON COLUMN service_order_items.reserved_quantity IS 'Quantity currently reserved from inventory';

-- ═════════════════════════════════════════════════════════════════════════════
-- 4. INVENTORY_OPERATIONS: new operation types for service orders
-- ═════════════════════════════════════════════════════════════════════════════
-- operation_type is VARCHAR(20) without a constraint, so no ALTER is needed.
-- New types used by the workshop module:
--   SO_RESERVE  : negative quantity, reserves stock when item is added to SO
--   SO_RELEASE  : positive quantity, releases a previous reservation
--   SO_CONSUME  : negative quantity, final deduction when SO is converted to sale
COMMENT ON COLUMN inventory_operations.operation_type IS
    'SALE, PURCHASE, RETURN, ADJUST, TRANSFER, INITIAL, QUOTE_RESERVE, QUOTE_RELEASE, SO_RESERVE, SO_RELEASE, SO_CONSUME';