name: 'Rate Limit Check'
description: 'Circuit breaker to prevent GitHub API exhaustion'
author: 'ClaudeForge'

branding:
  icon: 'activity'
  color: 'orange'

inputs:
  github-token:
    description: 'GitHub token for API access (usually secrets.GITHUB_TOKEN)'
    required: true
  minimum-remaining:
    description: 'Minimum API calls remaining to proceed (default: 50)'
    required: false
    default: '50'
  fail-on-limit:
    description: 'Whether to fail the workflow if below threshold (default: false, just warns)'
    required: false
    default: 'false'

outputs:
  can-proceed:
    description: 'Boolean indicating if enough API calls remain (true/false)'
    value: ${{ steps.check-limit.outputs.can-proceed }}
  remaining:
    description: 'Number of API calls remaining in current window'
    value: ${{ steps.check-limit.outputs.remaining }}
  limit:
    description: 'Total API rate limit for the token'
    value: ${{ steps.check-limit.outputs.limit }}
  used:
    description: 'Number of API calls used in current window'
    value: ${{ steps.check-limit.outputs.used }}
  reset-time:
    description: 'Unix timestamp when rate limit resets'
    value: ${{ steps.check-limit.outputs.reset-time }}
  reset-time-human:
    description: 'Human-readable time when rate limit resets'
    value: ${{ steps.check-limit.outputs.reset-time-human }}

runs:
  using: 'composite'
  steps:
    - name: Check GitHub API Rate Limit
      id: check-limit
      shell: bash
      env:
        GITHUB_TOKEN: ${{ inputs.github-token }}
        MIN_REMAINING: ${{ inputs.minimum-remaining }}
        FAIL_ON_LIMIT: ${{ inputs.fail-on-limit }}
      run: |
        echo "::group::GitHub API Rate Limit Check"

        # Query rate limit status
        echo "🔍 Querying GitHub API rate limit status..."
        RATE_LIMIT_JSON=$(gh api rate_limit)

        # Extract core API rate limit info
        REMAINING=$(echo "$RATE_LIMIT_JSON" | jq -r '.resources.core.remaining')
        LIMIT=$(echo "$RATE_LIMIT_JSON" | jq -r '.resources.core.limit')
        USED=$(echo "$RATE_LIMIT_JSON" | jq -r '.resources.core.used')
        RESET_TIMESTAMP=$(echo "$RATE_LIMIT_JSON" | jq -r '.resources.core.reset')

        # Convert reset timestamp to human-readable format
        if [[ "$OSTYPE" == "darwin"* ]]; then
          # macOS date command
          RESET_TIME_HUMAN=$(date -r "$RESET_TIMESTAMP" '+%Y-%m-%d %H:%M:%S %Z')
        else
          # Linux date command
          RESET_TIME_HUMAN=$(date -d "@$RESET_TIMESTAMP" '+%Y-%m-%d %H:%M:%S %Z')
        fi

        # Calculate percentage used
        PERCENT_USED=$(echo "scale=1; ($USED * 100) / $LIMIT" | bc)

        # Determine if we can proceed
        CAN_PROCEED="false"
        if [[ $REMAINING -ge $MIN_REMAINING ]]; then
          CAN_PROCEED="true"
        fi

        # Set outputs
        echo "can-proceed=$CAN_PROCEED" >> $GITHUB_OUTPUT
        echo "remaining=$REMAINING" >> $GITHUB_OUTPUT
        echo "limit=$LIMIT" >> $GITHUB_OUTPUT
        echo "used=$USED" >> $GITHUB_OUTPUT
        echo "reset-time=$RESET_TIMESTAMP" >> $GITHUB_OUTPUT
        echo "reset-time-human=$RESET_TIME_HUMAN" >> $GITHUB_OUTPUT

        # Display results
        echo ""
        echo "📊 Rate Limit Status:"
        echo "   - Limit: $LIMIT"
        echo "   - Used: $USED ($PERCENT_USED%)"
        echo "   - Remaining: $REMAINING"
        echo "   - Minimum Required: $MIN_REMAINING"
        echo "   - Reset Time: $RESET_TIME_HUMAN"
        echo ""

        # Status indicators
        if [[ $CAN_PROCEED == "true" ]]; then
          echo "✅ Sufficient API calls remaining ($REMAINING >= $MIN_REMAINING)"
        else
          echo "⚠️  Rate limit too low ($REMAINING < $MIN_REMAINING)"
          echo "🕐 API limit will reset at: $RESET_TIME_HUMAN"

          # Calculate wait time
          CURRENT_TIME=$(date +%s)
          WAIT_SECONDS=$((RESET_TIMESTAMP - CURRENT_TIME))
          WAIT_MINUTES=$((WAIT_SECONDS / 60))

          if [[ $WAIT_SECONDS -gt 0 ]]; then
            echo "⏱️  Wait time: ~$WAIT_MINUTES minutes"
          else
            echo "⏱️  Rate limit should reset momentarily"
          fi
        fi

        echo "::endgroup::"

        # Handle warnings and failures
        if [[ $CAN_PROCEED == "false" ]]; then
          if [[ $FAIL_ON_LIMIT == "true" ]]; then
            echo "::error::GitHub API rate limit too low ($REMAINING remaining, need $MIN_REMAINING). Failing workflow."
            exit 1
          else
            echo "::warning::GitHub API rate limit too low ($REMAINING remaining, need $MIN_REMAINING). Workflow may fail or be rate-limited."
          fi
        fi

    - name: Rate Limit Summary
      shell: bash
      if: steps.check-limit.outputs.can-proceed == 'false'
      run: |
        echo "::notice::⚠️ Low API Rate Limit Detected"
        echo "::notice::Remaining: ${{ steps.check-limit.outputs.remaining }} / ${{ steps.check-limit.outputs.limit }}"
        echo "::notice::Resets at: ${{ steps.check-limit.outputs.reset-time-human }}"