# ============================================
# 🧹 GitHub Workflow Cleanup
# --------------------------------------------
# This workflow deletes old workflow runs.
#
# 🔁 Triggered in two ways:
# - 🗓 Scheduled every Sunday at midnight UTC
# - 🧑‍💻 Manually via workflow_dispatch
#
# ⚙️ Behavior:
# - If `older_than_days` is provided:
#     → Deletes *all* runs older than that many days
# - If `older_than_days` is NOT provided:
#     → Deletes *only failed* runs regardless of age
#
# Uses GH CLI with token-based auth (stored as `GH_TOKEN`)
# Only affects runs with `status=completed` (not in-progress)
# ============================================

name: Workflow Cleanup

on:
  workflow_dispatch:
    inputs:
      older_than_days:
        description: 'Delete ANY run older than this many days (optional)'
        required: false
        type: number
  schedule:
    - cron: '0 0 * * 0' # Every Sunday at midnight UTC

jobs:
  cleanup:
    name: Cleanup Workflow Runs
    runs-on: ubuntu-latest

    steps:
      - name: Delete matching runs
        env:
          GH_TOKEN: ${{ secrets.GH_TOKEN }}
        run: |
          REPO="${{ github.repository }}"
          INPUT_DAYS="${{ github.event.inputs.older_than_days }}"
          echo "🔍 Evaluating workflow runs for cleanup"

          if [[ -n "$INPUT_DAYS" ]]; then
            CUTOFF_DATE=$(date -u -d "$INPUT_DAYS days ago" +%s)
            echo "🧹 Deleting ALL runs older than $INPUT_DAYS days"
            FILTER_BY_DATE=true
            RUN_FILTER='.'
          else
            echo "🧹 Deleting all FAILED runs (no age filter)"
            FILTER_BY_DATE=false
            RUN_FILTER='select(.conclusion == "failure")'
          fi

          # Fetch and parse runs (ID + created_at)
          RUNS=$(gh api -H "Authorization: token $GH_TOKEN" \
            -H "Accept: application/vnd.github+json" \
            "/repos/$REPO/actions/runs?per_page=100&status=completed" \
            --jq ".workflow_runs[] | $RUN_FILTER | [.id, .created_at] | @tsv")

          if [[ -z "$RUNS" ]]; then
            echo "✅ No matching runs found."
            exit 0
          fi

          echo "$RUNS" | while IFS=$'\t' read -r RUN_ID CREATED_AT; do
            CREATED_EPOCH=$(date -d "$CREATED_AT" +%s)

            if [[ "$FILTER_BY_DATE" == true && "$CREATED_EPOCH" -gt "$CUTOFF_DATE" ]]; then
              echo "⏩ Skipping run $RUN_ID (too recent)"
            else
              echo "🧹 Deleting run $RUN_ID (created $CREATED_AT)..."
              RESPONSE=$(gh api -X DELETE \
                -H "Authorization: token $GH_TOKEN" \
                "/repos/$REPO/actions/runs/$RUN_ID" 2>&1)

              if [[ $? -ne 0 ]]; then
                echo "⚠️ Failed to delete run $RUN_ID — $RESPONSE"
              else
                echo "✅ Deleted run $RUN_ID"
              fi
            fi
          done

          echo "🏁 Cleanup complete."