post-reel.yml

name: Post weekly reel to Instagram

# Generates the week's reel, commits it so GitHub Pages serves it at a public
# URL, then publishes it to Instagram via the Meta Graph API.
#
# Required repo secrets (Settings → Secrets and variables → Actions):
#   IG_USER_ID       Instagram Business account id
#   IG_ACCESS_TOKEN  long-lived access token
# See tools/REELS_AUTOMATION.md for the one-time setup.

on:
  schedule:
    - cron: "0 16 * * 3"   # every Wednesday 16:00 UTC
  workflow_dispatch:
    inputs:
      key:
        description: "Edition key to post (blank = auto rotation)"
        required: false
        default: ""
      color:
        description: "Ink color"
        required: false
        default: "red"
      dry_run:
        description: "Build + print only, do not publish"
        type: boolean
        required: false
        default: false

permissions:
  contents: write   # to commit the generated mp4

concurrency:
  group: post-reel
  cancel-in-progress: false

jobs:
  post:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      - name: Install fonts and Python deps
        run: |
          sudo apt-get update
          sudo apt-get install -y fonts-ipafont-gothic fonts-liberation
          python -m pip install --upgrade pip
          pip install pillow numpy imageio-ffmpeg

      - name: Resolve edition key
        id: pick
        run: |
          KEY="${{ github.event.inputs.key }}"
          if [ -z "$KEY" ]; then
            KEY=$(python - <<'PY'
          import json, time
          src=open("data/editions.js").read(); src=src[src.index("{"):src.rindex("}")+1]
          order=json.loads(src).get("plotterOrder")
          print(order[int(time.time()//(7*86400))%len(order)])
          PY
          )
          fi
          COLOR="${{ github.event.inputs.color }}"; COLOR="${COLOR:-red}"
          echo "key=$KEY"     >> "$GITHUB_OUTPUT"
          echo "color=$COLOR" >> "$GITHUB_OUTPUT"
          echo "Posting: $KEY ($COLOR)"

      - name: Generate reel
        run: |
          mkdir -p reels
          python - <<PY
          import sys; sys.path.insert(0, "tools")
          import gen_reel
          gen_reel.render("${{ steps.pick.outputs.key }}", "${{ steps.pick.outputs.color }}",
                          dur=15, fps=30,
                          out="reels/${{ steps.pick.outputs.key }}-${{ steps.pick.outputs.color }}-reel.mp4")
          PY

      - name: Commit reel so Pages can serve it
        run: |
          git config user.name  "plotflow-bot"
          git config user.email "bot@plotflow.io"
          git add reels/*.mp4
          if git diff --staged --quiet; then
            echo "No change to reel file."
          else
            git commit -m "Add reel for ${{ steps.pick.outputs.key }} [skip ci]"
            git push origin HEAD:${{ github.ref_name }}
          fi

      - name: Publish to Instagram
        env:
          IG_USER_ID: ${{ secrets.IG_USER_ID }}
          IG_ACCESS_TOKEN: ${{ secrets.IG_ACCESS_TOKEN }}
        run: |
          ARGS="--key ${{ steps.pick.outputs.key }} --color ${{ steps.pick.outputs.color }}"
          if [ "${{ github.event.inputs.dry_run }}" = "true" ]; then ARGS="$ARGS --dry-run"; fi
          python tools/post_reel.py $ARGS