name: Kubeadm Bootstrap
run-name: ${{ gitea.actor }} requested kubeadm bootstrap

on:
  workflow_dispatch:
    inputs:
      confirm:
        description: "Type BOOTSTRAP to run rebuild + kubeadm bootstrap"
        required: true
        type: string

concurrency:
  group: kubeadm-bootstrap
  cancel-in-progress: false

jobs:
  bootstrap:
    name: "Rebuild and Bootstrap Cluster"
    runs-on: ubuntu-latest

    steps:
      - name: Validate confirmation phrase
        run: |
          if [ "${{ inputs.confirm }}" != "BOOTSTRAP" ]; then
            echo "Confirmation failed. You must type BOOTSTRAP."
            exit 1
          fi

      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Create SSH key
        run: |
          install -m 0700 -d ~/.ssh
          KEY_SOURCE=""
          KEY_CONTENT=""
          KEY_B64="$(printf '%s' "${{ secrets.SSH_KEY_PRIVATE_BASE64 }}")"
          if [ -n "$KEY_B64" ]; then
            KEY_SOURCE="SSH_KEY_PRIVATE_BASE64"
            KEY_CONTENT="$(printf '%s' "$KEY_B64" | base64 -d)"
          else
            KEY_CONTENT="$(printf '%s' "${{ secrets.SSH_KEY_PRIVATE }}")"
            if [ -n "$KEY_CONTENT" ]; then
              KEY_SOURCE="SSH_KEY_PRIVATE"
            else
              KEY_CONTENT="$(printf '%s' "${{ secrets.KUBEADM_SSH_PRIVATE_KEY }}")"
              KEY_SOURCE="KUBEADM_SSH_PRIVATE_KEY"
            fi
          fi

          if [ -z "$KEY_CONTENT" ]; then
            echo "Missing SSH private key secret. Set SSH_KEY_PRIVATE_BASE64, SSH_KEY_PRIVATE, or KUBEADM_SSH_PRIVATE_KEY."
            exit 1
          fi

          KEY_CONTENT="$(printf '%s' "$KEY_CONTENT" | tr -d '\r')"
          if printf '%s' "$KEY_CONTENT" | grep -q '\\n'; then
            printf '%b' "$KEY_CONTENT" > ~/.ssh/id_ed25519
          else
            printf '%s\n' "$KEY_CONTENT" > ~/.ssh/id_ed25519
          fi
          chmod 0600 ~/.ssh/id_ed25519

          if ! ssh-keygen -y -f ~/.ssh/id_ed25519 >/dev/null 2>&1; then
            echo "Invalid private key content from $KEY_SOURCE"
            exit 1
          fi

      - name: Set up Terraform
        uses: hashicorp/setup-terraform@v2
        with:
          terraform_version: 1.6.6
          terraform_wrapper: false

      - name: Build Terraform backend files
        working-directory: terraform
        run: |
          cat > secrets.auto.tfvars << EOF
          pm_api_token_secret = "${{ secrets.PM_API_TOKEN_SECRET }}"
          SSH_KEY_PUBLIC      = "$(printf '%s' "${{ secrets.SSH_KEY_PUBLIC }}" | tr -d '\r\n')"
          EOF

          cat > backend.hcl << EOF
          bucket                      = "${{ secrets.B2_TF_BUCKET }}"
          key                         = "terraform.tfstate"
          region                      = "us-east-005"
          endpoints = {
            s3 = "${{ secrets.B2_TF_ENDPOINT }}"
          }
          access_key                  = "$(printf '%s' "${{ secrets.B2_KEY_ID }}" | tr -d '\r\n')"
          secret_key                  = "$(printf '%s' "${{ secrets.B2_APPLICATION_KEY }}" | tr -d '\r\n')"
          skip_credentials_validation = true
          skip_metadata_api_check     = true
          skip_region_validation      = true
          skip_requesting_account_id  = true
          use_path_style              = true
          EOF

      - name: Terraform init for state read
        working-directory: terraform
        run: terraform init -reconfigure -backend-config=backend.hcl

      - name: Create kubeadm inventory
        env:
          KUBEADM_SSH_USER: ${{ secrets.KUBEADM_SSH_USER }}
        run: |
          set -euo pipefail
          terraform -chdir=terraform output -json | ./nixos/kubeadm/scripts/render-inventory-from-tf-output.py > nixos/kubeadm/scripts/inventory.env

      - name: Validate nix installation
        run: |
          if [ -x /nix/var/nix/profiles/default/bin/nix ]; then
            /nix/var/nix/profiles/default/bin/nix --version
            exit 0
          fi

          if command -v nix >/dev/null 2>&1; then
            nix --version
            exit 0
          fi

          echo "Nix missing; installing no-daemon Nix for this runner job"
          if [ "$(id -u)" -eq 0 ]; then
            mkdir -p /nix
            chown root:root /nix
            chmod 0755 /nix

            if ! getent group nixbld >/dev/null 2>&1; then
              groupadd --system nixbld
            fi

            for i in $(seq 1 10); do
              if ! id "nixbld$i" >/dev/null 2>&1; then
                useradd --system --create-home --home-dir /var/empty --shell /usr/sbin/nologin "nixbld$i"
              fi
              usermod -a -G nixbld "nixbld$i"
            done
          fi
          sh <(curl -L https://nixos.org/nix/install) --no-daemon

          if [ -f "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then
            . "$HOME/.nix-profile/etc/profile.d/nix.sh"
          elif [ -f "/root/.nix-profile/etc/profile.d/nix.sh" ]; then
            . /root/.nix-profile/etc/profile.d/nix.sh
          fi

          export PATH="$HOME/.nix-profile/bin:/root/.nix-profile/bin:/nix/var/nix/profiles/default/bin:$PATH"

          nix --version

      - name: Install nixos-rebuild tool
        env:
          NIX_CONFIG: experimental-features = nix-command flakes
        run: |
          if [ -f "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then
            . "$HOME/.nix-profile/etc/profile.d/nix.sh"
          elif [ -f "/root/.nix-profile/etc/profile.d/nix.sh" ]; then
            . /root/.nix-profile/etc/profile.d/nix.sh
          fi

          export PATH="$HOME/.nix-profile/bin:/root/.nix-profile/bin:/nix/var/nix/profiles/default/bin:$PATH"

          nix profile install nixpkgs#nixos-rebuild

      - name: Run cluster rebuild and bootstrap
        env:
          NIX_CONFIG: experimental-features = nix-command flakes
          FAST_MODE: "1"
          WORKER_PARALLELISM: "3"
          REBUILD_TIMEOUT: "45m"
          REBUILD_RETRIES: "2"
        run: |
          if [ -f "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then
            . "$HOME/.nix-profile/etc/profile.d/nix.sh"
          elif [ -f "/root/.nix-profile/etc/profile.d/nix.sh" ]; then
            . /root/.nix-profile/etc/profile.d/nix.sh
          fi

          export PATH="$HOME/.nix-profile/bin:/root/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH"

          ./nixos/kubeadm/scripts/rebuild-and-bootstrap.sh