name: Close stale PRs with failed workflows

on:
  schedule:
    - cron: '0 3 * * *' # runs daily at 03:00 UTC
  workflow_dispatch:

permissions:
  contents: read
  issues: write
  pull-requests: write

jobs:
  close-stale:
    runs-on: ubuntu-latest
    steps:
      - name: Close stale PRs
        uses: actions/github-script@v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const mainBranches = ['main', 'master'];
            const cutoffDays = 14;
            const cutoff = new Date();
            cutoff.setDate(cutoff.getDate() - cutoffDays);

            console.log(`Checking PRs older than: ${cutoff.toISOString()}`);

            try {
              const { data: prs } = await github.rest.pulls.list({
                owner: context.repo.owner,
                repo: context.repo.repo,
                state: 'open',
                sort: 'updated',
                direction: 'asc',
                per_page: 100
              });

              console.log(`Found ${prs.length} open PRs to check`);

              for (const pr of prs) {
                try {
                  const updated = new Date(pr.updated_at);
                  
                  if (updated > cutoff) {
                    console.log(`⏩ Skipping PR #${pr.number} - updated recently`);
                    continue;
                  }

                  console.log(`🔍 Checking PR #${pr.number}: "${pr.title}"`);

                  // Get commits
                  const commits = await github.paginate(github.rest.pulls.listCommits, {
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    pull_number: pr.number,
                    per_page: 100
                  });

                  const meaningfulCommits = commits.filter(c => {
                    const msg = c.commit.message.toLowerCase();
                    const date = new Date(c.commit.committer.date);
                    const isMergeFromMain = mainBranches.some(branch =>
                      msg.startsWith(`merge branch '${branch}'`) ||
                      msg.includes(`merge remote-tracking branch '${branch}'`)
                    );
                      
                    return !isMergeFromMain && date > cutoff;
                  });

                  // Get checks with error handling
                  let hasFailedChecks = false;
                  let allChecksCompleted = false;
                  let hasChecks = false;
                  
                  try {
                    const { data: checks } = await github.rest.checks.listForRef({
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      ref: pr.head.sha
                    });
                    
                    hasChecks = checks.check_runs.length > 0;
                    hasFailedChecks = checks.check_runs.some(c => c.conclusion === 'failure');
                    allChecksCompleted = checks.check_runs.every(c => 
                      c.status === 'completed' || c.status === 'skipped'
                    );
                  } catch (error) {
                    console.log(`⚠️ Could not fetch checks for PR #${pr.number}: ${error.message}`);
                  }

                  // Get workflow runs with error handling
                  let hasFailedWorkflows = false;
                  let allWorkflowsCompleted = false;
                  let hasWorkflows = false;
                  
                  try {
                    const { data: runs } = await github.rest.actions.listWorkflowRuns({
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      head_sha: pr.head.sha,
                      per_page: 50
                    });

                    hasWorkflows = runs.workflow_runs.length > 0;
                    hasFailedWorkflows = runs.workflow_runs.some(r => r.conclusion === 'failure');
                    allWorkflowsCompleted = runs.workflow_runs.every(r => 
                      ['completed', 'skipped', 'cancelled'].includes(r.status)
                    );

                    console.log(`PR #${pr.number}: ${runs.workflow_runs.length} workflow runs found`);

                  } catch (error) {
                    console.log(`⚠️ Could not fetch workflow runs for PR #${pr.number}: ${error.message}`);
                  }

                  console.log(`PR #${pr.number}: ${meaningfulCommits.length} meaningful commits`);
                  console.log(`Checks - has: ${hasChecks}, failed: ${hasFailedChecks}, completed: ${allChecksCompleted}`);
                  console.log(`Workflows - has: ${hasWorkflows}, failed: ${hasFailedWorkflows}, completed: ${allWorkflowsCompleted}`);

                  // Combine conditions - only consider if we actually have checks/workflows
                  const hasAnyFailure = (hasChecks && hasFailedChecks) || (hasWorkflows && hasFailedWorkflows);
                  const allCompleted = (!hasChecks || allChecksCompleted) && (!hasWorkflows || allWorkflowsCompleted);

                  if (meaningfulCommits.length === 0 && hasAnyFailure && allCompleted) {
                    console.log(`✅ Closing PR #${pr.number} (${pr.title})`);

                    await github.rest.issues.createComment({
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      issue_number: pr.number,
                      body: `This pull request has been automatically closed because its workflows or checks failed and it has been inactive for more than ${cutoffDays} days. Please fix the workflows and reopen if you'd like to continue. Merging from main/master alone does not count as activity.`
                    });

                    await github.rest.pulls.update({
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      pull_number: pr.number,
                      state: 'closed'
                    });
                    
                    console.log(`✅ Successfully closed PR #${pr.number}`);
                  } else {
                    console.log(`⏩ Not closing PR #${pr.number} - conditions not met`);
                  }

                } catch (prError) {
                  console.error(`❌ Error processing PR #${pr.number}: ${prError.message}`);
                  continue;
                }
              }
              
            } catch (error) {
              console.error(`❌ Fatal error: ${error.message}`);
              throw error;
            }