name: Discord Main Branch Notifier

on:
  push:
    branches:
      - main

permissions:
  contents: read

jobs:
  notify:
    runs-on: ubuntu-latest
    if: github.event.head_commit != null
    steps:
      - name: Checkout with full history
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Collect diff stats
        id: diff
        env:
          BEFORE: ${{ github.event.before }}
          AFTER: ${{ github.sha }}
        run: |
          set -e

          if [ "$BEFORE" = "0000000000000000000000000000000000000000" ] \
             || ! git cat-file -e "${BEFORE}^{commit}" 2>/dev/null; then
            echo "before SHA unusable, falling back to first parent of HEAD"
            BEFORE=$(git rev-parse "${AFTER}^" 2>/dev/null || echo "$AFTER")
          fi

          echo "Diffing $BEFORE -> $AFTER"

          NUMSTAT=$(git diff --numstat "$BEFORE" "$AFTER" || true)

          FILES=$(printf '%s\n' "$NUMSTAT" | grep -c . || true)
          ADD=$(printf '%s\n' "$NUMSTAT" | awk '{ if ($1 ~ /^[0-9]+$/) a += $1 } END { print a+0 }')
          DEL=$(printf '%s\n' "$NUMSTAT" | awk '{ if ($2 ~ /^[0-9]+$/) d += $2 } END { print d+0 }')
          COMMITS=$(git rev-list --count "${BEFORE}..${AFTER}" 2>/dev/null || echo 1)

          echo "files=$FILES  added=$ADD  removed=$DEL  commits=$COMMITS"

          {
            echo "files=$FILES"
            echo "added=$ADD"
            echo "removed=$DEL"
            echo "commits=$COMMITS"
          } >> "$GITHUB_OUTPUT"

      - name: Send Discord Notification
        env:
          WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
          FILES: ${{ steps.diff.outputs.files }}
          ADDED: ${{ steps.diff.outputs.added }}
          REMOVED: ${{ steps.diff.outputs.removed }}
          COMMITS: ${{ steps.diff.outputs.commits }}
        run: |
          PAYLOAD=$(jq -c \
            --arg files "$FILES" \
            --arg add "$ADDED" \
            --arg del "$REMOVED" \
            --arg commits "$COMMITS" '
            .head_commit as $c
            | (.repository.full_name) as $repo
            | (.ref | sub("refs/heads/"; "")) as $branch
            | ($c.message | split("\n")[0]) as $title
            | ($c.message | split("\n")[1:] | join("\n")) as $body
            | {
                username: "Ocatane - Main",
                avatar_url: "https://images.habbo.com/c_images/album1584/FR450.gif",
                embeds: [
                  {
                    author: {
                      name: ($c.author.username // $c.author.name),
                      url: ("https://github.com/" + ($c.author.username // "")),
                      icon_url: (.sender.avatar_url)
                    },
                    title: ("🏨  " + ($title | .[0:230])),
                    url: $c.url,
                    description: (
                      (if ($body | gsub("\\s"; "") | length) > 0
                        then ($body | .[0:1400]) + "\n\n"
                        else ""
                      end)
                      + "**Room:** `" + $repo + "`  •  **Branch:** `" + $branch + "`\n"
                      + "**Commit:** [`" + ($c.id[0:7]) + "`](" + $c.url + ")"
                      + "  •  [compare](" + .compare + ")"
                    ),
                    color: 16751616,
                    thumbnail: {
                      url: "https://www.habbo.com/habbo-imaging/avatarimage?figure=hr-165-45.hd-180-2.ch-255-66.lg-280-110.sh-305-62&direction=2&head_direction=3&size=l&action=wav"
                    },
                    fields: [
                      { name: "📦 Files changed", value: ("```" + $files + "```"), inline: true },
                      { name: "🟩 Added",         value: ("```diff\n+" + $add + "```"), inline: true },
                      { name: "🟥 Removed",       value: ("```diff\n-" + $del + "```"), inline: true }
                    ],
                    footer: {
                      text: ($repo + " • " + $commits + " commit(s) pushed to " + $branch),
                      icon_url: "https://github.githubassets.com/favicons/favicon.png"
                    },
                    timestamp: $c.timestamp
                  }
                ]
              }
          ' "$GITHUB_EVENT_PATH")

          curl -sS -f \
               -H "Content-Type: application/json" \
               -X POST \
               -d "$PAYLOAD" \
               "$WEBHOOK_URL"