SELECT
    i.item_number AS "Item Number",
    COALESCE(NULLIF(i.item_descrip1, ''), i.item_descrip2) AS "Description",
    CASE i.item_type
        WHEN 'P' THEN 'Purchased'
        WHEN 'M' THEN 'Manufactured'
        WHEN 'R' THEN 'Reference'
        WHEN 'T' THEN 'Tooling'
        WHEN 'O' THEN 'Outside Process'
        WHEN 'B' THEN 'Breeder'
        WHEN 'C' THEN 'Co-Product'
        WHEN 'F' THEN 'Phantom'
        ELSE i.item_type
    END AS "Item Type",
    clc.classcode_code AS "Class Code",
    COALESCE(bom_count.num_boms, 0) AS "BOMs Used In",
    COALESCE(qoh.qty_on_hand, 0) AS "QOH",
    cc.comment_user AS "Created By",
    COALESCE(i.item_created, cc.comment_date)::date AS "Date Created",
    last_txn.last_transaction_date::date AS "Last Transaction",
    (CURRENT_DATE - COALESCE(last_txn.last_transaction_date, i.item_created, cc.comment_date)::date) AS "Days Unused"
FROM item i
LEFT JOIN classcode clc ON clc.classcode_id = i.item_classcode_id
LEFT JOIN (
    SELECT bomitem_item_id, COUNT(DISTINCT bomitem_parent_item_id) AS num_boms
    FROM bomitem
    GROUP BY bomitem_item_id
) bom_count ON bom_count.bomitem_item_id = i.item_id
LEFT JOIN (
    SELECT itemsite_item_id, SUM(itemsite_qtyonhand) AS qty_on_hand
    FROM itemsite
    GROUP BY itemsite_item_id
) qoh ON qoh.itemsite_item_id = i.item_id
LEFT JOIN comment cc
    ON cc.comment_source_id = i.item_id
    AND cc.comment_source = 'I'
    AND cc.comment_text = 'Created'
LEFT JOIN (
    SELECT
        isite.itemsite_item_id,
        MAX(ih.invhist_transdate) AS last_transaction_date
    FROM itemsite isite
    JOIN invhist ih ON ih.invhist_itemsite_id = isite.itemsite_id
    GROUP BY isite.itemsite_item_id
) last_txn ON last_txn.itemsite_item_id = i.item_id
WHERE i.item_active
  AND (CURRENT_DATE - COALESCE(last_txn.last_transaction_date, i.item_created, cc.comment_date)::date)
      >= '{{UnusedDays.text}}'::int
ORDER BY "Days Unused" DESC