name: 'Nginx Switch'
description: 'Switches the Nginx upstream to the newly staged color'
inputs:
  ssh_key:
    description: 'SSH Private Key'
    required: true
  host:
    description: 'Remote Nginx Host'
    required: true
  port:
    description: 'Remote SSH Port'
    required: true
  user:
    description: 'Remote User'
    required: true
  app_key:
    description: 'Application Key'
    required: true
  app_upstream_host:
    description: 'App Server Host or IP'
    required: true
  pending_port:
    description: 'Pending Port'
    required: true
  pending_color:
    description: 'Pending Color'
    required: true
  auto_deploy_path:
    description: 'Path to auto-deploy repo on remote'
    required: true
  auto_deploy_branch:
    description: 'Branch to checkout in auto-deploy repo'
    required: false
    default: 'main'
runs:
  using: 'composite'
  steps:
    - name: SSH Nginx Switch
      shell: bash
      env:
        SSH_KEY: ${{ inputs.ssh_key }}
        DEPLOY_HOST: ${{ inputs.host }}
        DEPLOY_PORT: ${{ inputs.port }}
        DEPLOY_USER: ${{ inputs.user }}
        APP_KEY: ${{ inputs.app_key }}
        APP_UPSTREAM_HOST: ${{ inputs.app_upstream_host }}
        PENDING_PORT: ${{ inputs.pending_port }}
        PENDING_COLOR: ${{ inputs.pending_color }}
        AUTO_DEPLOY_PATH: ${{ inputs.auto_deploy_path }}
        AUTO_DEPLOY_BRANCH: ${{ inputs.auto_deploy_branch }}
      run: |
        set -eu
        
        SSH_TMP_DIR="$(mktemp -d)"
        trap 'rm -rf "$SSH_TMP_DIR"' EXIT
        
        echo "$SSH_KEY" > "$SSH_TMP_DIR/id_rsa"
        chmod 600 "$SSH_TMP_DIR/id_rsa"
        ssh-keyscan -p "$DEPLOY_PORT" "$DEPLOY_HOST" > "$SSH_TMP_DIR/known_hosts"
        
        SSH_OPTS=(
          -i "$SSH_TMP_DIR/id_rsa"
          -o UserKnownHostsFile="$SSH_TMP_DIR/known_hosts"
          -o StrictHostKeyChecking=yes
          -p "$DEPLOY_PORT"
        )
        
        ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$DEPLOY_HOST" \
          "APP_KEY=$(printf '%q' "$APP_KEY") \
           APP_UPSTREAM_HOST=$(printf '%q' "$APP_UPSTREAM_HOST") \
           PENDING_PORT=$(printf '%q' "$PENDING_PORT") \
           PENDING_COLOR=$(printf '%q' "$PENDING_COLOR") \
           AUTO_DEPLOY_PATH=$(printf '%q' "$AUTO_DEPLOY_PATH") \
           AUTO_DEPLOY_BRANCH=$(printf '%q' "$AUTO_DEPLOY_BRANCH") \
           bash -se" << 'EOF'
          cd "$AUTO_DEPLOY_PATH"
          git checkout "$AUTO_DEPLOY_BRANCH"
          git pull --ff-only
          git submodule sync --recursive
          git submodule update --init --recursive
          echo "[remote] auto-deploy repo updated on nginx server"
          ./common/nginx/manage-nginx.sh switch "$APP_KEY" "$APP_UPSTREAM_HOST" "$PENDING_PORT"
          echo "[remote] nginx switched $APP_KEY to $APP_UPSTREAM_HOST:$PENDING_PORT ($PENDING_COLOR)"
        EOF