86 lines
3.3 KiB
Transact-SQL
86 lines
3.3 KiB
Transact-SQL
CREATE OR ALTER FUNCTION pricing.guidance_logic(
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@target numeric(20,5),
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@last_norm numeric(20,5),
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@list_eff numeric(20,5),
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@last_date date,
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@floor_pct numeric(10,5) = 0.05,
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@cap_last_pct numeric(10,5) = 1.00,
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@cap_list_pct numeric(10,5) = 1.00
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)
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RETURNS @ret TABLE (
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guidance_price numeric(20,5),
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guidance_reason nvarchar(4000)
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)
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AS
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BEGIN
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DECLARE
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@base_price numeric(20,5), -- starting point (target if available, else last_norm, else list_eff)
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@after_floor numeric(20,5), -- after applying floor: raised if below (1 - floor_pct) * last_norm
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@after_cap_last numeric(20,5), -- after applying last cap: lowered if above cap_last_pct * last_norm
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@final_price numeric(20,5), -- after applying list cap: lowered if above cap_list_pct * list_eff
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@reason nvarchar(4000) = N''; -- explanation text for what rules applied
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-- Early exit if nothing to work with
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IF @target IS NULL AND @last_norm IS NULL AND @list_eff IS NULL
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BEGIN
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INSERT INTO @ret VALUES (NULL, N'No target, last, or list available');
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RETURN;
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END;
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-- Pick starting base price
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SET @base_price = COALESCE(@target, @last_norm, @list_eff);
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-- Step 1: use base price unless it's more than x% below last price
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SET @after_floor = @base_price;
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IF @last_norm IS NOT NULL
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SET @after_floor = ROUND(
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CASE WHEN @base_price >= @last_norm*(1-@floor_pct)
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THEN @base_price
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ELSE @last_norm*(1-@floor_pct)
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END, 5);
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-- Step 2: cap vs last_norm
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SET @after_cap_last = @after_floor;
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IF @last_norm IS NOT NULL
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SET @after_cap_last = ROUND(
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CASE WHEN @after_floor <= @last_norm*@cap_last_pct
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THEN @after_floor
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ELSE @last_norm*@cap_last_pct
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END, 5);
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-- Step 3: cap vs list_eff
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SET @final_price = @after_cap_last;
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IF @list_eff IS NOT NULL
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SET @final_price = ROUND(
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CASE WHEN @after_cap_last <= @list_eff*@cap_list_pct
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THEN @after_cap_last
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ELSE @list_eff*@cap_list_pct
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END, 5);
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-- Reason text
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SET @reason =
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CASE
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WHEN @target IS NOT NULL THEN 'Using target price'
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WHEN @last_norm IS NOT NULL THEN 'Using last price as base'
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WHEN @list_eff IS NOT NULL THEN 'Using list price as base'
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END;
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IF @last_norm IS NOT NULL AND @floor_pct > 0 AND @after_floor > @base_price
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SET @reason += N', floored to ' + FORMAT(@floor_pct*100,'0.##') + N'% below last price';
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IF @last_norm IS NOT NULL AND @after_cap_last < @after_floor
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SET @reason += CASE WHEN @cap_last_pct = 1
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THEN N', capped to not exceed last price'
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ELSE N', capped to ' + FORMAT(@cap_last_pct*100,'0.##') + N'% of last price'
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END;
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IF @list_eff IS NOT NULL AND @final_price < @after_cap_last
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SET @reason += CASE WHEN @cap_list_pct = 1
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THEN N', capped to not exceed list price'
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ELSE N', capped to ' + FORMAT(@cap_list_pct*100,'0.##') + N'% of list price'
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END;
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INSERT INTO @ret VALUES (@final_price, @reason);
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RETURN;
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END;
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