-- name: GetFirstIncompletePreviousPractice :one
WITH target AS (
    SELECT id, owner_type, owner_id, COALESCE(display_order, 0) AS display_order
    FROM question_sets
    WHERE id = @question_set_id::BIGINT
      AND set_type = 'PRACTICE'
      AND status = 'PUBLISHED'
),
candidates AS (
    SELECT qs.id, qs.title, COALESCE(qs.display_order, 0) AS display_order
    FROM question_sets qs
    JOIN target t
      ON qs.owner_type = t.owner_type
     AND qs.owner_id = t.owner_id
    WHERE qs.set_type = 'PRACTICE'
      AND qs.status = 'PUBLISHED'
      AND COALESCE(qs.display_order, 0) < t.display_order
)
SELECT c.id, c.title, c.display_order
FROM candidates c
LEFT JOIN user_practice_progress upp
  ON upp.question_set_id = c.id
 AND upp.user_id = @user_id::BIGINT
 AND upp.completed_at IS NOT NULL
WHERE upp.id IS NULL
ORDER BY c.display_order ASC, c.id ASC
LIMIT 1;

-- name: MarkPracticeCompleted :execrows
INSERT INTO user_practice_progress (
    user_id,
    question_set_id,
    completed_at,
    updated_at
)
VALUES (
    @user_id::BIGINT,
    @question_set_id::BIGINT,
    CURRENT_TIMESTAMP,
    CURRENT_TIMESTAMP
)
ON CONFLICT (user_id, question_set_id) DO UPDATE
SET completed_at = EXCLUDED.completed_at,
    updated_at = EXCLUDED.updated_at;