- name: "Clean up the Synapse DB"
  hosts: unhb4
  remote_user: root

  tasks:
    - name: "Install jq"
      ansible.builtin.apt:
        pkg:
         - jq
         - python3-psycopg2

    - name: "Get IP of DB container for the database synapse uses"
      ansible.builtin.shell: |
        docker inspect {{ synapse_db_clean_container_db }} | jq -r '.[].NetworkSettings.Networks[].IPAddress'
      register: docker_network_inspect_synapse_db

    - ansible.builtin.set_fact:
        postgres_ip_synapse_db: "{{ docker_network_inspect_synapse_db.stdout }}"

    - name: "Ensure Synapse is disabled before accessing the database"
      ansible.builtin.shell:
        cmd: "docker compose stop {{ synapse_db_clean_container_synapse }}"
        chdir: "{{ synapse_db_clean_compose_file_dir }}"
      tags: molecule-notest

    - name: "Delete orphan state_groups_state"
      postgresql_query:
        db: "{{ synapse_db_clean_db }}"
        login_host: "{{ postgres_ip_synapse_db }}"
        login_user: "{{ synapse_db_clean_user }}"
        login_password: "{{ synapse_db_clean_password }}"
        query: DELETE FROM state_groups_state WHERE room_id IN (SELECT DISTINCT(state_groups.room_id) AS room_id_gone FROM state_groups LEFT JOIN events USING(room_id) WHERE events.room_id IS NULL GROUP BY room_id_gone)

    - name: "Delete orphan state_groups_state"
      postgresql_query:
        db: "{{ synapse_db_clean_db }}"
        login_host: "{{ postgres_ip_synapse_db }}"
        login_user: "{{ synapse_db_clean_user }}"
        login_password: "{{ synapse_db_clean_password }}"
        query: DELETE FROM state_groups WHERE room_id IN (SELECT DISTINCT(state_groups.room_id) AS room_id_gone FROM state_groups LEFT JOIN events USING(room_id) WHERE events.room_id IS NULL GROUP BY room_id_gone)

    - name: "Reindex DB"
      postgresql_query:
        db: "{{ synapse_db_clean_db }}"
        login_host: "{{ postgres_ip_synapse_db }}"
        login_user: "{{ synapse_db_clean_user }}"
        login_password: "{{ synapse_db_clean_password }}"
        autocommit: yes
        query: "REINDEX (VERBOSE) DATABASE {{ synapse_db_clean_db }}"

    - name: "Vacuum DB"
      postgresql_query:
        db: "{{ synapse_db_clean_db }}"
        login_host: "{{ postgres_ip_synapse_db }}"
        login_user: "{{ synapse_db_clean_user }}"
        login_password: "{{ synapse_db_clean_password }}"
        autocommit: yes
        query: VACUUM FULL VERBOSE

    - name: "Ensure Synapse is re-enabled"
      ansible.builtin.shell:
        cmd: "docker compose up -d {{ synapse_db_clean_container_synapse }}"
        chdir: "{{ synapse_db_clean_compose_file_dir }}"
      tags: molecule-notest