defmodule BdfrBrowser.Repo.Migrations.AddPostCommentFulltextSearch do
  use Ecto.Migration

  def up do
    # Posts
    execute """
      ALTER TABLE posts 
        ADD COLUMN searchable_content tsvector
        GENERATED ALWAYS AS (
          setweight(to_tsvector('english', coalesce(title, '')), 'A') ||
          setweight(to_tsvector('german', coalesce(title, '')), 'A') ||
          setweight(to_tsvector('english', coalesce(selftext, '')), 'B') ||
          setweight(to_tsvector('german', coalesce(selftext, '')), 'B') ||
          setweight(to_tsvector('simple', coalesce(author, '')), 'C')
        ) STORED;
    """

    execute """
      CREATE INDEX posts_searchable_content_index ON posts USING gin(searchable_content);
    """

    # Comments
    execute """
      ALTER TABLE comments 
        ADD COLUMN searchable_content tsvector
        GENERATED ALWAYS AS (
          setweight(to_tsvector('english', coalesce(body, '')), 'A') ||
          setweight(to_tsvector('german', coalesce(body, '')), 'A') ||
          setweight(to_tsvector('simple', coalesce(author, '')), 'B')
        ) STORED;
    """

    execute """
      CREATE INDEX comments_searchable_content_index ON comments USING gin(searchable_content);
    """
  end

  def down do
    # Posts
    drop index("posts", [:searchable_content])

    alter table(:posts) do
      remove :searchable_content
    end

    # Comments
    drop index("comments", [:searchable_content])

    alter table(:comments) do
      remove :searchable_content
    end
  end
end