name: Delete Caches

# yamllint disable-line rule:truthy
on:
  pull_request:
    types: [closed]
  workflow_dispatch:
    inputs:
      pr-number:
        description: "Closed PR number"
        type: string
        required: true

jobs:
  delete:
    name: "Delete unused caches (PR #${{ github.event.inputs.pr-number || github.event.number }})"
    runs-on: ubuntu-latest
    permissions:
      actions: write
    steps:
      - name: Delete caches
        run: |
          ref="refs/pull/${{ github.event.inputs.pr-number || github.event.number }}/merge"

          page=1
          per_page=100
          del_count=0

          while true; do
            res=$(curl -fsS \
              -H "Accept: application/vnd.github+json" \
              -H "Authorization: token ${{ github.token }}" \
              "https://api.github.com/repos/${{ github.repository }}/actions/caches?per_page=$per_page&page=$page")

            res_count=$(echo $res | jq '.actions_caches | length')
            if [ $res_count -eq 0 ]; then break; fi

            targets=$(echo $res | jq \
              --arg ref "$ref" \
              '.actions_caches[] | select(.ref == $ref) | del(.created_at, .size_in_bytes, .version)')
            echo "$targets"

            for id in $(echo $targets | jq '.id'); do
              curl -fsS \
                -X DELETE \
                -H "Accept: application/vnd.github+json" \
                -H "Authorization: token ${{ github.token }}" \
                "https://api.github.com/repos/${{ github.repository }}/actions/caches/$id"
              ((del_count+=1))
            done

            if [ $res_count -lt $per_page ]; then break; fi
            ((page+=1))
          done

          echo "Delete $del_count caches."