-- ═══════════════════════════════════════════════════════════════════════
-- v3.3 — Marketplace accepts any part number (seller listings)
-- Target: nexus_autoparts (master DB)
-- Date: 2026-05-17
--
-- Makes warehouse_inventory part_id nullable and adds seller-defined
-- fields so any seller can list parts that don't exist in the OEM catalog.
-- Existing OEM-matched listings are untouched.
-- ═══════════════════════════════════════════════════════════════════════

-- ─── 1. WAREHOUSE_INVENTORY — add seller listing columns ─────────────

ALTER TABLE warehouse_inventory
    ADD COLUMN IF NOT EXISTS seller_part_number VARCHAR(100),
    ADD COLUMN IF NOT EXISTS seller_part_name   VARCHAR(300),
    ADD COLUMN IF NOT EXISTS seller_category    VARCHAR(100),
    ADD COLUMN IF NOT EXISTS tenant_inventory_id INTEGER;

-- Make part_id nullable so seller listings (without catalog match) can exist
ALTER TABLE warehouse_inventory ALTER COLUMN part_id DROP NOT NULL;

-- ─── 2. WAREHOUSE_INVENTORY — drop old unique, add partial uniques ───

-- The old constraint was on (user_id, part_id, warehouse_location).
-- We replace it with two partial unique indexes:
--   - OEM items:    (bodega_id, part_id, warehouse_location) WHERE part_id IS NOT NULL
--   - Seller items: (bodega_id, seller_part_number, warehouse_location) WHERE part_id IS NULL

ALTER TABLE warehouse_inventory
    DROP CONSTRAINT IF EXISTS warehouse_inventory_user_id_part_id_warehouse_location_key;

DROP INDEX IF EXISTS idx_wi_unique_composite;

CREATE UNIQUE INDEX IF NOT EXISTS idx_wi_unique_oem
ON warehouse_inventory(bodega_id, part_id, warehouse_location)
WHERE part_id IS NOT NULL;

CREATE UNIQUE INDEX IF NOT EXISTS idx_wi_unique_seller
ON warehouse_inventory(bodega_id, seller_part_number, warehouse_location)
WHERE part_id IS NULL;

-- Ensure every row has either part_id or seller_part_number
ALTER TABLE warehouse_inventory
    DROP CONSTRAINT IF EXISTS chk_wi_part_or_seller;

ALTER TABLE warehouse_inventory
    ADD CONSTRAINT chk_wi_part_or_seller
    CHECK (
        (part_id IS NOT NULL AND seller_part_number IS NULL)
        OR
        (part_id IS NULL AND seller_part_number IS NOT NULL)
    );

-- ─── 3. WAREHOUSE_INVENTORY — search indexes ─────────────────────────

CREATE INDEX IF NOT EXISTS idx_wi_seller_pn
ON warehouse_inventory (bodega_id, seller_part_number)
WHERE part_id IS NULL;

CREATE INDEX IF NOT EXISTS idx_wi_seller_category
ON warehouse_inventory (seller_category)
WHERE part_id IS NULL;

-- GIN index for text search on seller listings
CREATE INDEX IF NOT EXISTS idx_wi_seller_search
ON warehouse_inventory
USING gin (to_tsvector('spanish',
    COALESCE(seller_part_name, '') || ' ' || COALESCE(seller_part_number, '')
))
WHERE part_id IS NULL;

-- ─── 4. PURCHASE_ORDER_ITEMS — make part_id nullable ─────────────────

ALTER TABLE purchase_order_items
    ALTER COLUMN part_id DROP NOT NULL;

-- Add a flag so seller listings can be distinguished in POs
ALTER TABLE purchase_order_items
    ADD COLUMN IF NOT EXISTS is_seller_listing BOOLEAN NOT NULL DEFAULT FALSE;

-- ─── 5. Back-compat: ensure existing rows are valid ──────────────────

-- Existing rows should have part_id set and seller_part_number NULL.
-- If any row violates the new check, this will fail loudly.
UPDATE warehouse_inventory
SET seller_part_number = NULL
WHERE part_id IS NOT NULL AND seller_part_number IS NOT NULL;

UPDATE warehouse_inventory
SET part_id = NULL
WHERE part_id IS NULL AND seller_part_number IS NULL;