-- 007_remove_duplicate_recipes_by_name.sql
-- Removes duplicate recipes that share the same "Name" (trimmed, exact match).
-- Keeps the row with the lowest "Id" for each name.
--
-- Analysis of Recipes-2.csv export (196 rows):
--   168 unique names, 28 duplicate groups, 28 rows to delete (Ids 113–140).
--   Those duplicate Ids mirror Ids 29–56 one-to-one.
--
-- Run inside a transaction. Review the preview queries before COMMIT.

BEGIN;

-- ---------------------------------------------------------------------------
-- 1) Preview duplicates
-- ---------------------------------------------------------------------------
-- SELECT
--     r."Name",
--     array_agg(r."Id" ORDER BY r."Id") AS ids,
--     min(r."Id") AS keep_id,
--     array_agg(r."Id" ORDER BY r."Id") FILTER (WHERE r."Id" <> min(r."Id")) AS remove_ids
-- FROM diet."Recipes" r
-- GROUP BY r."Name"
-- HAVING count(*) > 1
-- ORDER BY min(r."Id");

-- ---------------------------------------------------------------------------
-- 2) Build duplicate map: remove_id -> keep_id
-- ---------------------------------------------------------------------------
CREATE TEMP TABLE recipe_dedup_map ON COMMIT DROP AS
SELECT
    r."Id" AS remove_id,
    d.keep_id
FROM diet."Recipes" r
INNER JOIN (
    SELECT btrim("Name") AS name_key, MIN("Id") AS keep_id
    FROM diet."Recipes"
    GROUP BY btrim("Name")
    HAVING COUNT(*) > 1
) d ON btrim(r."Name") = d.name_key
WHERE r."Id" <> d.keep_id;

-- Optional: restrict to known duplicate ids from export
-- DELETE FROM recipe_dedup_map WHERE remove_id NOT BETWEEN 113 AND 140;

DO $$
DECLARE
    dup_count int;
BEGIN
    SELECT count(*) INTO dup_count FROM recipe_dedup_map;
    RAISE NOTICE 'Duplicate recipe rows to remove: %', dup_count;
END $$;

-- ---------------------------------------------------------------------------
-- 3) Re-point foreign keys to the canonical (lowest-id) recipe
-- ---------------------------------------------------------------------------

-- Meal planner / diet generator drafts
UPDATE diet."MealPlanEntries" e
SET "RecipeId" = m.keep_id,
    "UpdatedAt" = now()
FROM recipe_dedup_map m
WHERE e."RecipeId" = m.remove_id;

UPDATE diet."DietGeneratorDraftMeals" d
SET "RecipeId" = m.keep_id
FROM recipe_dedup_map m
WHERE d."RecipeId" = m.remove_id;

-- AI recipe generator saved draft pointer
UPDATE diet."RecipeGeneratorSessions" s
SET "SavedRecipeId" = m.keep_id,
    "UpdatedAt" = now()
FROM recipe_dedup_map m
WHERE s."SavedRecipeId" = m.remove_id;

-- Diet tracking (nullable FK)
UPDATE diet."MealConsumptions" c
SET "RecipeId" = m.keep_id
FROM recipe_dedup_map m
WHERE c."RecipeId" = m.remove_id;

-- Favorites: drop rows that would collide after merge, then re-point the rest
DELETE FROM diet."UserFavoriteRecipes" f
USING recipe_dedup_map m
WHERE f."RecipeId" = m.remove_id
  AND EXISTS (
      SELECT 1
      FROM diet."UserFavoriteRecipes" f2
      WHERE f2."UserId" = f."UserId"
        AND f2."RecipeId" = m.keep_id
  );

UPDATE diet."UserFavoriteRecipes" f
SET "RecipeId" = m.keep_id
FROM recipe_dedup_map m
WHERE f."RecipeId" = m.remove_id;

-- ---------------------------------------------------------------------------
-- 4) Delete duplicate recipes (Ingredients + RecipeSteps cascade)
-- ---------------------------------------------------------------------------
DELETE FROM diet."Recipes" r
USING recipe_dedup_map m
WHERE r."Id" = m.remove_id;

-- ---------------------------------------------------------------------------
-- 5) Verify
-- ---------------------------------------------------------------------------
DO $$
DECLARE
    remaining_dup_names int;
    recipe_count int;
BEGIN
    SELECT count(*) INTO remaining_dup_names
    FROM (
        SELECT btrim("Name")
        FROM diet."Recipes"
        GROUP BY btrim("Name")
        HAVING count(*) > 1
    ) d;

    SELECT count(*) INTO recipe_count FROM diet."Recipes";

    IF remaining_dup_names > 0 THEN
        RAISE EXCEPTION 'Duplicate recipe names still present: % groups', remaining_dup_names;
    END IF;

    RAISE NOTICE 'Done. Active recipe count: %', recipe_count;
END $$;

COMMIT;

-- Optional hardening (uncomment if every recipe name must be unique going forward):
-- CREATE UNIQUE INDEX IF NOT EXISTS "UX_Recipes_Name"
--     ON diet."Recipes" (btrim("Name"))
--     WHERE "IsActive" AND NOT "IsDraft";