-- Atomic insert that generates a unique task_number and inserts a task in one transaction
-- Returns: id (uuid), task_number (text)

CREATE OR REPLACE FUNCTION insert_task_with_number(
  p_title text,
  p_description text,
  p_office_id text,
  p_ticket_id text,
  p_request_type text,
  p_request_type_other text,
  p_request_category text,
  p_creator_id uuid
)
RETURNS TABLE(id uuid, task_number text)
LANGUAGE plpgsql
SECURITY DEFINER
AS $$
DECLARE
  -- The numbering trigger on `tasks` will set `task_number` before insert.
  -- This RPC inserts the task row and returns the resulting id and task_number.
BEGIN
  -- atomically increment (or create) the month counter and use it as the task_number
  INSERT INTO task_number_counters(year_month, counter)
    VALUES (to_char(now(), 'YYYY-MM-'), 1)
    ON CONFLICT (year_month) DO UPDATE
      SET counter = task_number_counters.counter + 1
    RETURNING counter INTO seq;

  -- build the formatted task number
  PERFORM seq; -- ensure seq is set
  new_task_number := to_char(now(), 'YYYY-MM-') || lpad(seq::text, 5, '0');

  INSERT INTO tasks(
    title, description, office_id, ticket_id,
    request_type, request_type_other, request_category,
    creator_id, created_at, task_number
  ) VALUES (
    p_title,
    p_description,
    CASE WHEN p_office_id IS NULL OR p_office_id = '' THEN NULL ELSE p_office_id::uuid END,
    CASE WHEN p_ticket_id IS NULL OR p_ticket_id = '' THEN NULL ELSE p_ticket_id::uuid END,
    CASE WHEN p_request_type IS NULL OR p_request_type = '' THEN NULL ELSE p_request_type::request_type END,
    p_request_type_other,
    CASE WHEN p_request_category IS NULL OR p_request_category = '' THEN NULL ELSE p_request_category::request_category END,
    p_creator_id,
    now(),
    new_task_number
  ) RETURNING tasks.id, tasks.task_number INTO id, task_number;

  RETURN NEXT;
END;
$$;

-- Grant execute to authenticated so client RPC can call it
GRANT EXECUTE ON FUNCTION insert_task_with_number(text,text,text,text,text,text,text,uuid) TO authenticated;