75 lines
2.4 KiB
PL/PgSQL
75 lines
2.4 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION pricequote.guidance_logic(
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_target_price NUMERIC(20,5),
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_last_price NUMERIC(20,5),
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_list_price NUMERIC(20,5),
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_last_date DATE
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)
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RETURNS TABLE (
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guidance_price NUMERIC(20,5),
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guidance_reason TEXT
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) AS $$
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DECLARE
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_price NUMERIC(20,5);
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_reason TEXT := '';
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_floored NUMERIC(20,5);
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_capped NUMERIC(20,5);
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_use_last_price BOOLEAN := FALSE;
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BEGIN
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-- Evaluate whether last price is recent enough
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IF _last_price IS NOT NULL AND _last_date IS NOT NULL AND _last_date > CURRENT_DATE - INTERVAL '2 years' THEN
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_use_last_price := TRUE;
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END IF;
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IF _target_price IS NOT NULL AND _use_last_price THEN
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_floored := GREATEST(_target_price, _last_price * 0.95);
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_capped := LEAST(_floored, _last_price);
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_price := LEAST(COALESCE(_list_price, 1e9), _capped);
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IF _price = _last_price THEN
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_reason := 'Cap at last price';
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ELSE
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_reason := 'Using target price';
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IF _target_price < _last_price * 0.95 THEN
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_reason := _reason || ', floored to 5% below last price';
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END IF;
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IF _target_price > _last_price THEN
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_reason := _reason || ', capped to not exceed last price';
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END IF;
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IF _list_price IS NOT NULL AND _price = _list_price AND _target_price > _list_price THEN
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_reason := _reason || ', capped to not exceed list price';
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END IF;
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END IF;
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ELSIF _use_last_price THEN
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_price := _last_price;
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_reason := 'Last price - no target';
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ELSIF _target_price IS NOT NULL THEN
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_price := _target_price;
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IF _last_price IS NOT NULL AND _last_date IS NOT NULL THEN
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_reason := format(
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'Last price ignored (too old: %s), using target price',
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to_char(_last_date, 'YYYY-MM-DD')
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);
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ELSE
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_reason := 'Target price - no prior sale';
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END IF;
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ELSE
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_price := NULL;
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IF _last_price IS NOT NULL AND _last_date IS NOT NULL THEN
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_reason := format(
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'Last price ignored (too old: %s), no pricing available',
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to_char(_last_date, 'YYYY-MM-DD')
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);
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ELSE
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_reason := 'No pricing available';
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END IF;
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END IF;
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RETURN QUERY SELECT _price, _reason;
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END;
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$$ LANGUAGE plpgsql;
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