name: Announce release on Discord

on:
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      tag:
        description: Release tag to announce
        required: true
        type: string

permissions:
  contents: read

jobs:
  announce:
    runs-on: ubuntu-latest

    steps:
      - name: Send Discord announcement
        env:
          DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
          RELEASE_TAG_INPUT: ${{ inputs.tag }}
          REPO: ${{ github.repository }}
          GH_TOKEN: ${{ github.token }}
        run: |
          test -n "$DISCORD_WEBHOOK_URL"

          if [ "$GITHUB_EVENT_NAME" = "workflow_dispatch" ]; then
            test -n "$RELEASE_TAG_INPUT"
            curl --fail-with-body \
              -H "Accept: application/vnd.github+json" \
              -H "Authorization: Bearer $GH_TOKEN" \
              -H "X-GitHub-Api-Version: 2022-11-28" \
              "$GITHUB_API_URL/repos/$REPO/releases/tags/$RELEASE_TAG_INPUT" \
              > release.json
          else
            jq '.release' "$GITHUB_EVENT_PATH" > release.json
          fi

          if [ "$(jq -r '.prerelease' release.json)" = "true" ]; then
            echo "Skipping prerelease."
            exit 0
          fi

          jq -n \
            --arg repo "$REPO" \
            --arg name "$(jq -r '.name // ""' release.json)" \
            --arg tag "$(jq -r '.tag_name' release.json)" \
            --arg url "$(jq -r '.html_url' release.json)" \
            --arg body "$(jq -r '.body // ""' release.json)" \
            '($body | if length > 1500 then .[:1500] + "...\n\n[Read more](" + $url + ")" else . end) as $description |
            {
              username: "Basecoat Releases",
              allowed_mentions: { parse: [] },
              embeds: [{
                title: ($repo + " " + $tag),
                url: $url,
                description: ((if $name != "" then "**" + $name + "**\n\n" else "" end) + $description),
                color: 5793266
              }]
            }' > payload.json

          curl --fail-with-body \
            --retry 3 \
            --retry-all-errors \
            --retry-delay 2 \
            -H "Content-Type: application/json" \
            -X POST \
            -d @payload.json \
            "$DISCORD_WEBHOOK_URL"