---
- name: Set up the environment for the impress-2020 app
  hosts: webserver
  vars:
    email_address: "emi@matchu.dev" # TODO: Extract this to personal config?
  tasks:
    - name: Copy authorized SSH keys
      copy:
        dest: ~/.ssh/authorized_keys
        src: ../authorized-ssh-keys.txt

    - name: Disable root SSH login
      become: yes
      lineinfile:
        dest: /etc/ssh/sshd_config
        regexp: ^#?PermitRootLogin
        line: PermitRootLogin no

    - name: Disable password-based SSH authentication
      become: yes
      lineinfile:
        dest: /etc/ssh/sshd_config
        regexp: ^#?PasswordAuthentication
        line: PasswordAuthentication no

    - name: Install fail2ban firewall with default settings
      become: yes
      apt:
        update_cache: yes
        name: fail2ban

    - name: Configure ufw firewall to allow SSH connections on port 22
      become: yes
      community.general.ufw:
        rule: allow
        port: "22"

    - name: Configure ufw firewall to allow HTTP connections on port 80
      become: yes
      community.general.ufw:
        rule: allow
        port: "80"

    - name: Configure ufw firewall to allow HTTP connections on port 443
      become: yes
      community.general.ufw:
        rule: allow
        port: "443"

    - name: Enable ufw firewall with all other ports closed by default
      become: yes
      community.general.ufw:
        state: enabled
        policy: deny

    - name: Install unattended-upgrades
      become: yes
      apt:
        update_cache: yes
        name: unattended-upgrades

    - name: Enable unattended-upgrades to auto-upgrade our system
      become: yes
      copy:
        content: |
          APT::Periodic::Update-Package-Lists "1";
          APT::Periodic::Unattended-Upgrade "1";
        dest: /etc/apt/apt.conf.d/20auto-upgrades

    - name: Configure unattended-upgrades to auto-reboot our server when necessary
      become: yes
      lineinfile:
        regex: ^(//\s*)?Unattended-Upgrade::Automatic-Reboot ".*";$
        line: Unattended-Upgrade::Automatic-Reboot "true";
        dest: /etc/apt/apt.conf.d/50unattended-upgrades

    - name: Configure unattended-upgrades to delay necessary reboots to 3am
      become: yes
      lineinfile:
        regex: ^(//\s*)?Unattended-Upgrade::Automatic-Reboot-Time ".*";$
        line: Unattended-Upgrade::Automatic-Reboot-Time "03:00";
        dest: /etc/apt/apt.conf.d/50unattended-upgrades

    - name: Configure the system timezone to be US Pacific time
      become: yes
      community.general.timezone:
        name: America/Los_Angeles

    - name: Create the app versions folder
      become: yes
      file:
        path: /srv/impress-2020/versions
        owner: "{{ ansible_user_id }}"
        group: "{{ ansible_user_id }}"
        state: directory

    - name: Add Nodesource apt key
      become: yes
      apt_key:
        id: 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280
        url: https://deb.nodesource.com/gpgkey/nodesource.gpg.key

    - name: Add Node v16 apt repository
      become: yes
      apt_repository:
        repo: deb https://deb.nodesource.com/node_16.x focal main

    - name: Install Node v16
      become: yes
      apt:
        update_cache: yes
        name: nodejs

    - name: Install Yarn
      become: yes
      npm:
        name: yarn
        global: yes

    - name: Check for a current app version
      stat:
        path: /srv/impress-2020/current
      register: current_app_version

    - name: Check whether we already have a placeholder app
      stat:
        path: /srv/impress-2020/versions/initial-placeholder
      register: existing_placeholder_app
      when: not current_app_version.stat.exists

    - name: Create a placeholder app, to run until we deploy a real version
      command:
        chdir: /srv/impress-2020/versions
        cmd: yarn create next-app initial-placeholder
      when: |
        not current_app_version.stat.exists and
          not existing_placeholder_app.stat.exists

    - name: Build the placeholder app
      command:
        chdir: /srv/impress-2020/versions/initial-placeholder
        cmd: yarn build
      when: not current_app_version.stat.exists

    - name: Set the placeholder app as the current version
      file:
        src: /srv/impress-2020/versions/initial-placeholder
        dest: /srv/impress-2020/current
        state: link
      when: not current_app_version.stat.exists

    - name: Install pm2
      become: yes
      npm:
        name: pm2
        global: yes

    - name: Create pm2 startup script
      # The current user is going to become the pm2 owner of the app server
      # process. They'll be able to manage it without `sudo`, including during
      # normal deploys, and run `pm2 monit` from their shell to see status.
      become: yes
      command: "pm2 startup systemd {{ ansible_user_id }} --hp /home/{{ ansible_user_id }}"

    - name: Create pm2 ecosystem file
      copy:
        content: |
          module.exports = {
            apps: [
              {
                name: "impress-2020",
                cwd: "/srv/impress-2020/current",
                // Instead of `yarn start`, we specify the `next` binary
                // directly, because it helps pm2 monitor our app correctly.
                // https://github.com/vercel/next.js/discussions/10675#discussioncomment-34615
                script: "./node_modules/.bin/next",
                args: "start --port=3000",
                instances: "max",
                exec_mode: "cluster",
              }
            ]
          }
        dest: "~/ecosystem.config.js"
        # Create a temporary backup file, so we can use it to delete the old
        # version of the services. (This is important if e.g. a service is
        # removed or renamed, in which case deleting from the *new* config file
        # wouldn't include it.)
        backup: yes
      register: pm2_ecosystem_file

    - name: Delete old pm2 services if config file changed
      command: "pm2 delete {{ pm2_ecosystem_file.backup_file | quote }}"
      when: pm2_ecosystem_file is changed and pm2_ecosystem_file.backup_file is defined

    - name: Delete old pm2 config file if it changed
      file:
        path: "{{ pm2_ecosystem_file.backup_file }}"
        state: absent
      when: pm2_ecosystem_file is changed and pm2_ecosystem_file.backup_file is defined

    - name: Start pm2 services
      command: "pm2 start ~/ecosystem.config.js"

    - name: Save pm2 startup script
      command: pm2 save

    - name: Install nginx
      become: yes
      apt:
        update_cache: yes
        name: nginx

    - name: Install core snap
      become: yes
      community.general.snap:
        name: core

    - name: Install certbot as a snap
      become: yes
      community.general.snap:
        name: certbot
        classic: yes

    - name: Set up certbot
      become: yes
      command: "certbot certonly --nginx -n --agree-tos --email {{ email_address }} --domains impress-2020-box.openneo.net"

    - name: Add impress-2020 config file to nginx
      become: yes
      copy:
        content: |
          server {
            server_name impress-2020-box.openneo.net;
            listen 80;
            if ($host = impress-2020-box.openneo.net) {
              return 301 https://$host$request_uri;
            }
          }

          server {
            server_name impress-2020-box.openneo.net;
            listen 443 ssl;
            ssl_certificate /etc/letsencrypt/live/impress-2020-box.openneo.net/fullchain.pem;
            ssl_certificate_key /etc/letsencrypt/live/impress-2020-box.openneo.net/privkey.pem;
            include /etc/letsencrypt/options-ssl-nginx.conf;
            ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
            ssl_session_cache shared:SSL:10m; # https://superuser.com/q/1484466/14127

            # TODO: Serve static files directly, instead of through the proxy
            location / {
              proxy_pass http://127.0.0.1:3000;
            }
          }
        dest: /etc/nginx/sites-enabled/impress-2020
      notify:
        - Restart nginx

    - name: Install dependencies for the npm module node-canvas
      become: yes
      apt:
        update_cache: yes
        name:
          - build-essential
          - libcairo2-dev
          - libpango1.0-dev
          - libjpeg-dev
          - libgif-dev
          - librsvg2-dev

  handlers:
    - name: Restart nginx
      become: yes
      systemd:
        name: nginx
        state: restarted