name: Build and Push Image

on:
  push:
    branches:
      - main
      - master
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set image variables
        id: vars
        env:
          REGISTRY_URL: ${{ secrets.REGISTRY_URL }}
        run: |
          set -euo pipefail
          REGISTRY_HOST="${REGISTRY_URL#https://}"
          REGISTRY_HOST="${REGISTRY_HOST#http://}"
          REPO_NAME="${GITHUB_REPOSITORY##*/}"
          if [ -z "$REPO_NAME" ]; then
            REPO_NAME="$(basename "$PWD")"
          fi
          TERRARIA_VERSION="$(awk -F= '/^ARG T_VERSION=/{print $2; exit}' Dockerfile)"
          if [ -z "$TERRARIA_VERSION" ]; then
            echo "T_VERSION not found in Dockerfile" >&2
            exit 1
          fi
          echo "registry_host=$REGISTRY_HOST" >> "$GITHUB_OUTPUT"
          echo "image=$REGISTRY_HOST/$REPO_NAME" >> "$GITHUB_OUTPUT"
          echo "terraria_version=$TERRARIA_VERSION" >> "$GITHUB_OUTPUT"

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ steps.vars.outputs.registry_host }}
          username: ${{ secrets.REGISTRY_USERNAME }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ steps.vars.outputs.image }}
          tags: |
            type=sha
            type=raw,value=latest
            type=raw,value=${{ steps.vars.outputs.terraria_version }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}