name: CI and release

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  workflow_dispatch:

env:
  CARGO_TERM_COLOR: always
  DATABASE_URL: postgres://postgres:postgres@postgres:5432/tg_dev_srv_bot
  DISCORD_TOKEN: testing
  SQLX_OFFLINE: true

jobs:
  test:
    name: Run tests
    runs-on: ubuntu-latest
    permissions:
      contents: read
    services:
      postgres:
        image: postgres:16-alpine
        env:
          POSTGRES_USER: postgres
          POSTGRES_PASSWORD: postgres
          POSTGRES_DB: tg_dev_srv_bot
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

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

      - name: Install system dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y libgmp-dev libmpfr-dev libmpc-dev

      - name: Set up Rust
        run: |
          if ! command -v rustup >/dev/null 2>&1; then
            curl --proto '=https' --tlsv1.2 --silent --show-error --fail \
              https://sh.rustup.rs --output /tmp/rustup-init.sh
            sh /tmp/rustup-init.sh -y --profile minimal
            echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
            export PATH="$HOME/.cargo/bin:$PATH"
          fi

          rustup toolchain install stable --profile minimal
          rustup default stable

      - name: Run tests
        run: cargo test --verbose

  release_metadata:
    name: Detect release commit
    if: github.event_name == 'push'
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      is_release: ${{ steps.release_commit.outputs.is_release }}
      version: ${{ steps.release_commit.outputs.version }}

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

      - name: Detect release commit
        id: release_commit
        shell: bash
        run: |
          subject="$(git log -1 --pretty=%s)"
          echo "is_release=false" >> "$GITHUB_OUTPUT"

          if [[ "$subject" =~ ^Release\ ([0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
            echo "is_release=true" >> "$GITHUB_OUTPUT"
            echo "version=${BASH_REMATCH[1]}" >> "$GITHUB_OUTPUT"
          fi

  container:
    name: Build and publish container
    needs: release_metadata
    if: github.event_name == 'push'
    runs-on: ubuntu-latest

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: git.ewenlau.net
          username: ${{ secrets.GIT_USERNAME }}
          password: ${{ secrets.GIT_PASSWORD }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: git.ewenlau.net/${{ secrets.GIT_USERNAME }}/tg-dev-srv-bot
          tags: |
            type=raw,value=dev
            type=raw,value=${{ needs.release_metadata.outputs.version }},enable=${{ needs.release_metadata.outputs.is_release == 'true' }}
            type=raw,value=latest,enable=${{ needs.release_metadata.outputs.is_release == 'true' }}

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

  release:
    name: Create release
    needs: [release_metadata, container]
    if: success() && needs.release_metadata.outputs.is_release == 'true'
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout complete history
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Generate linked release notes
        env:
          SERVER_URL: ${{ github.server_url }}
          REPOSITORY: ${{ github.repository }}
        shell: bash
        run: |
          previous_tag="$(
            git tag --merged HEAD^ --sort=-version:refname \
              | grep -E '^[0-9]+\.[0-9]+\.[0-9]+$' \
              | head -n 1 || true
          )"

          if [[ -n "$previous_tag" ]]; then
            range="${previous_tag}..HEAD"
            heading="## Commits since ${previous_tag}"
          else
            range="HEAD"
            heading="## Commits"
          fi

          echo "$heading" > release-notes.md
          echo >> release-notes.md
          while IFS=$'\t' read -r sha subject; do
            short_sha="${sha:0:7}"
            printf -- '- [`%s`](%s/%s/commit/%s) %s\n' \
              "$short_sha" "$SERVER_URL" "$REPOSITORY" "$sha" "$subject"
          done < <(git log --reverse --pretty=tformat:'%H%x09%s' "$range") \
            >> release-notes.md

      - name: Publish release
        env:
          API_URL: ${{ github.api_url }}
          REPOSITORY: ${{ github.repository }}
          RELEASE_TOKEN: ${{ secrets.GITEA_TOKEN }}
          VERSION: ${{ needs.release_metadata.outputs.version }}
        shell: bash
        run: |
          release_url="${API_URL}/repos/${REPOSITORY}/releases/tags/${VERSION}"
          status="$(
            curl --silent --show-error \
              --output existing-release.json \
              --write-out '%{http_code}' \
              --header "Authorization: token ${RELEASE_TOKEN}" \
              "$release_url"
          )"

          if [[ "$status" == "200" ]]; then
            echo "Release ${VERSION} already exists; nothing to do."
            exit 0
          fi

          if [[ "$status" != "404" ]]; then
            cat existing-release.json >&2
            exit 1
          fi

          jq --null-input \
            --arg tag_name "$VERSION" \
            --arg name "Release $VERSION" \
            --arg target_commitish "$GITHUB_SHA" \
            --rawfile body release-notes.md \
            '{
              tag_name: $tag_name,
              target_commitish: $target_commitish,
              name: $name,
              body: $body,
              draft: false,
              prerelease: false
            }' > release.json

          status="$(
            curl --silent --show-error \
              --output created-release.json \
              --write-out '%{http_code}' \
              --request POST \
              --header "Authorization: token ${RELEASE_TOKEN}" \
              --header "Content-Type: application/json" \
              --data @release.json \
              "${API_URL}/repos/${REPOSITORY}/releases"
          )"

          if [[ "$status" != "201" ]]; then
            cat created-release.json >&2
            exit 1
          fi