CREATE OR REPLACE FUNCTION rlarp.get_list(_billto text, _shipto text, _item text, _qty numeric)
RETURNS jsonb
LANGUAGE plpgsql AS
--DO
$func$
DECLARE
--    _billto text;
--    _shipto text;
--    _item   text;
--    _qty    numeric;
    _rslt   jsonb;

BEGIN
    --_billto := 'DIAM0004';
    --_shipto := 'DIAM0004';
    --_item   := 'AMK06000G18B054';
    --_qty    := 5400;

CREATE TEMP TABLE IF NOT EXISTS cp AS (
--every unqiue price list scenario
SELECT
     s.bill_cust
    ,s.ship_cust
    ,s.part
    ,i.unti unit
    ,s.qtyord
    ,i.uomp
    ,CASE WHEN COALESCE(sc.plevel,'') = '' THEN bc.plevel ELSE sc.plevel END plvl
FROM
    (SELECT _billto bill_cust, _shipto ship_cust, _item part, _qty qtyord) s
    LEFT OUTER JOIN "CMS.CUSLG".itemm i ON
        i.item = s.part
    LEFT OUTER JOIN rlarp.cust sc ON
        sc.code = s.ship_cust
    LEFT OUTER JOIN rlarp.cust bc ON
        bc.code = s.bill_cust
WHERE
    CASE WHEN COALESCE(sc.plevel,'') = '' THEN bc.plevel ELSE sc.plevel END <> ''
GROUP BY
     s.bill_cust
    ,s.ship_cust
    ,s.part
    ,i.unti
    ,s.qtyord
    ,i.uomp
    ,CASE WHEN COALESCE(sc.plevel,'') = '' THEN bc.plevel ELSE sc.plevel END
) WITH DATA;

--drop table cp
--SELECT * FROM cp WHERE bill_cust = 'DIST0008'  and part = 'TCF06SG0G18C050' and ship_cust = 'DIST0007'

CREATE TEMP TABLE IF NOT EXISTS plfull AS (
--all all rows for relevant part/price levels
WITH 
----------unique price points-----------------------
lvl AS (
    SELECT DISTINCT
        plvl
        ,part
        ,unit
    FROM
        cp
)
------------join prices for price level------------
,plj AS (
    SELECT
        lvl.plvl
        ,lvl.part
        ,lvl.unit
        ,i.jcplcd
        ,i.jcunit
        ,i.jcvoll
        ,i.jcpric
    FROM
        lvl
        INNER JOIN "CMS.CUSLG".iprcbhc hc ON
            hc.jbplvl  = lvl.plvl
            AND current_date BETWEEN hc.jbfdat AND hc.jbtdat 
        INNER JOIN lgdat.iprcc i ON
            i.jcplcd = hc.jbplcd 
            AND i.jcpart = lvl.part
)
-----------uom conversions-------------------
,uom AS (
    SELECT 
        uom.p part
        ,uom.f
        ,uom.t
        ,uom.nm/uom.dm rate
    FROM 
        (
            SELECT 
                jsonb_agg(row_to_json(d)::jsonb) jdoc 
            FROM 
                (
                    SELECT DISTINCT 
                        part partn 
                        ,jcunit fu
                        ,unit tu 
                    FROM 
                        plj
                    WHERE 
                        part <> ''
                ) d
        ) c 
        JOIN LATERAL rlarp.uom_array(c.jdoc) uom ON TRUE
)
------price list sorted---------------------
    SELECT
         plj.plvl
        ,plj.part
        ,plj.unit
        ,plj.jcplcd
        --,plj.jcunit
        ,round(plj.jcvoll * uom.rate,5) vol
        ,round(plj.jcpric / uom.rate,5) price
        --,uom.rate
        --dont partition by list code becuase there could be duplicate assignments
        ,row_number() OVER (PARTITION BY plj.plvl, plj.part, plj.unit ORDER BY round(plj.jcvoll * uom.rate,5) ASC) rn
    FROM
        plj
        INNER JOIN uom  ON
            uom.part = plj.part
            AND uom.f = plj.jcunit
            AND uom.t = plj.unit
) WITH DATA;

--select * from plfull

CREATE TEMP TABLE IF NOT EXISTS pl AS (
--create from-to volume range for price list
WITH RECURSIVE
pl(plvl, listcode, part, unit, volf, volt, price1, price2, rn, lvl) AS (
    SELECT
         p1.plvl
        ,p1.jcplcd as listcode
        ,p1.part
        ,p1.unit
        ,0::numeric     volf
        ,p1.vol         volt
        ,null::numeric  price1
        ,p1.price       price2
        ,p1.rn
        ,0 lvl
    FROM
        plfull p1
    WHERE
        p1.rn = 1
    UNION ALL
    SELECT
         pl.plvl
        ,COALESCE(f.jcplcd,pl.listcode) listcode
        ,pl.part
        ,pl.unit
        ,pl.volt                    volf
        ,COALESCE(f.vol,999999999)  volt
        ,pl.price2                  price1
        ,f.price                    price2
        ,f.rn
        ,pl.lvl + 1
    FROM
        pl
        LEFT OUTER JOIN plfull f ON
                f.plvl = pl.plvl
            AND f.part = pl.part
            AND f.unit = pl.unit
            AND f.rn = pl.rn + 1
    WHERE
        pl.price2 IS NOT NULL
) SEARCH DEPTH FIRST BY part, plvl, unit SET ordercol
SELECT
    plvl
    ,listcode
    ,part
    ,unit
    ,volf
    ,volt
    ,numrange(volf, volt) vrange
    ,price1 price
    --,price2
    --,rn
    --,lvl
    --,ordercol
FROM 
    pl
ORDER BY 
    ordercol 
) WITH DATA;

--select * from pl
--add primary key to test if there are any price level that overlap the same part number
--alter table pl add primary key (plvl, part, unit, vrange);

CREATE TEMP TABLE IF NOT EXISTS cpj AS (
--go back to every unique scenario and join to modified list with volum range
SELECT
    cp.*
    ,pl.price
    ,pl.listcode
FROM
    cp
    INNER JOIN pl ON
        pl.part = cp.part
        AND pl.plvl = cp.plvl
        AND pl.unit = cp.unit
WHERE
    pl.vrange @> cp.qtyord
) WITH DATA;

--select * from cpj where part = 'TCF06SG0G18C050'

SELECT
    jsonb_build_object('list',cpj.price) 
    ||jsonb_build_object('listcode',cpj.listcode) 
    ||jsonb_build_object('plvl',cpj.plvl)
INTO
    _rslt
FROM
    cpj;

--RAISE NOTICE 'list: %' ,_rslt;

DROP TABLE IF EXISTS cp;
DROP TABLE IF EXISTS plfull;
DROP TABLE IF EXISTS pl;
DROP TABLE IF EXISTS cpj;

RETURN _rslt;


END;
$func$;