tps/functions/srce_import_dev.sql

DO $F$
DECLARE _t text;
DECLARE _c text;
DECLARE _log_info jsonb;
DECLARE _log_id text;
DECLARE _cnt numeric;
DECLARE _message jsonb;
_MESSAGE_TEXT text;
_PG_EXCEPTION_DETAIL text;
_PG_EXCEPTION_HINT text;
_path text;
_srce text;

BEGIN

    _path := 'C:\users\fleet\downloads\testj.csv';
    _srce := 'DMAPI';

----------------------------------------------------test if source exists----------------------------------------------------------------------------------

    SELECT
        COUNT(*)
    INTO
        _cnt
    FROM
        tps.srce    
    WHERE
        srce = _srce;

    IF _cnt = 0 THEN
        _message:= 
        format(
            $$
                {
                    "status":"fail",
                    "message":"source %L does not exists"
                }
            $$,
            _srce
        )::jsonb;
    END IF;
----------------------------------------------------build the column list of the temp table----------------------------------------------------------------

	SELECT
        string_agg(quote_ident(prs.key)||' '||prs.type,','),
        string_agg(quote_ident(prs.key),',')
    INTO
    	_t, 
        _c
    FROM 
        tps.srce
        --unwrap the schema definition array
        LEFT JOIN LATERAL jsonb_populate_recordset(null::tps.srce_defn_schema, defn->'schema') prs ON TRUE
    WHERE   
        srce = _srce
    GROUP BY
        srce;
        
----------------------------------------------------add create table verbage in front of column list--------------------------------------------------------

    _t := format('CREATE TEMP TABLE csv_i (%s, id SERIAL)', _t);
    --RAISE NOTICE '%', _t;
    --RAISE NOTICE '%', _c;

    DROP TABLE IF EXISTS csv_i;
    
    EXECUTE _t;

----------------------------------------------------do the insert-------------------------------------------------------------------------------------------

    --the column list needs to be dynamic forcing this whole line to be dynamic
    _t := format('COPY csv_i (%s) FROM %L WITH (HEADER TRUE,DELIMITER '','', FORMAT CSV, ENCODING ''SQL_ASCII'',QUOTE ''"'');',_c,_path);

    --RAISE NOTICE '%', _t;

    EXECUTE _t;
	
	--drop table if exists tps.x;
	--create table tps.x as
	--(
    WITH 

    -------------extract the limiter fields to one row per source----------------------------------

    ext AS (
    SELECT 
        srce
        ,defn->'unique_constraint'->>'fields'
        ,ARRAY(SELECT ae.e::text[] FROM jsonb_array_elements_text(defn->'unique_constraint'->'fields') ae(e)) text_array
    FROM
        tps.srce
    WHERE
        srce = _srce
        --add where clause for targeted source
    )

    -------------for each imported row in the COPY table, genereate the json rec, and a column for the json key specified in the srce.defn-----------

    ,pending_list AS (
        SELECT
            tps.jsonb_extract(
                    row_to_json(i)::jsonb
                    ,ext.text_array
            ) json_key,
            row_to_json(i)::JSONB rec,
            srce,
            --ae.rn,
            id
        FROM
            csv_i i
            INNER JOIN ext ON
                ext.srce = _srce
        ORDER BY    
            id ASC
    )
    

    -----------create a unique list of keys from staged rows------------------------------------------------------------------------------------------

    , pending_keys AS (
        SELECT DISTINCT
            json_key
        FROM 
            pending_list
    )
    
        -----------list of keys already loaded to tps-----------------------------------------------------------------------------------------------------

    , matched_keys AS (
        SELECT DISTINCT
            k.json_key
        FROM
            pending_keys k
            INNER JOIN tps.trans t ON
                t.ic = k.json_key
    )

    -----------return unique keys that are not already in tps.trans-----------------------------------------------------------------------------------

    , unmatched_keys AS (
    SELECT
        json_key
    FROM
        pending_keys

    EXCEPT

    SELECT
        json_key
    FROM
        matched_keys
    )

    -----------insert pending rows that have key with no trans match-----------------------------------------------------------------------------------
    --need to look into mapping the transactions prior to loading

    , inserted AS (
        INSERT INTO
            tps.trans (srce, rec, ic)
        SELECT
            pl.srce
            ,pl.rec
            ,pl.json_key
        FROM 
            pending_list pl
            INNER JOIN unmatched_keys u ON
                u.json_key = pl.json_key
        ORDER BY
            pl.id ASC
        ----this conflict is only if an exact duplicate rec json happens, which will be rejected
        ----therefore, records may not be inserted due to ay matches with certain json fields, or if the entire json is a duplicate, reason is not specified
        RETURNING *
    )

    --------summarize records not inserted-------------------+------------------------------------------------------------------------------------------------

    , logged AS (
    INSERT INTO
        tps.trans_log (info)
    SELECT
        JSONB_BUILD_OBJECT('time_stamp',CURRENT_TIMESTAMP)
        ||JSONB_BUILD_OBJECT('srce',_srce)
        ||JSONB_BUILD_OBJECT('path',_path)
        ||JSONB_BUILD_OBJECT('not_inserted',
            (
                SELECT 
                    jsonb_agg(json_key)
                FROM
                    matched_keys
            )
        )
        ||JSONB_BUILD_OBJECT('inserted',
            (
                SELECT 
                    jsonb_agg(json_key)
                FROM
                    unmatched_keys
            )
        )
    RETURNING *
    )

    SELECT
        id
        ,info
    INTO
        _log_id
        ,_log_info
    FROM
        logged;

    RAISE NOTICE 'import logged under id# %, info: %', _log_id, _log_info;

    /*
    _message:= 
    (
        format(
        $$
            {
            "status":"complete",
            "message":"import of %L for source %L complete"
            }
        $$, _path, _srce)::jsonb
    )||jsonb_build_object('details',_log_info);


    RAISE NOTICE '%s',_message;
    */
    --select * from pending_keys
	--) with data;
end;
$F$;
/*
SELECT
    JSONB_PRETTY(k.json_key) orig, 
    jsonb_pretty(jsonb_build_object('input_constraint',k.json_key)) uq,
    T.REC
FROM
    tps.x k
    left outer JOIN tps.trans t ON
        t.rec @> k.json_key;
*/