name: PR Format Validation

on:
  pull_request:
    types: [opened, edited, synchronize]

jobs:
  validate-pr:
    runs-on: ubuntu-latest
    steps:
      - name: Check for Spam PR
        uses: actions/github-script@v7
        with:
          script: |
            const prTitle = context.payload.pull_request.title;
            const spamRegex = /^(feat|chore|fix)(\(.*\))?\s*:/i;

            if (spamRegex.test(prTitle)) {
              // Leave a comment explaining why
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.pull_request.number,
                body: `## PR Closed as Spam

            This PR was automatically closed because the title format \`feat:\`, \`fix:\`, or \`chore:\` is commonly associated with spam contributions.

            If this is a legitimate contribution, please:
            1. Review our contribution guidelines
            2. Use the correct PR title format: \`directory, ...: description\`
            3. Open a new PR with the proper title format

            Thank you for your understanding.`
              });

              // Close the PR
              await github.rest.pulls.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: context.payload.pull_request.number,
                state: 'closed'
              });

              core.setFailed('PR closed as spam due to suspicious title format');
              return;
            }

            console.log('✅ PR passed spam check');

      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check PR Title Format
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const path = require('path');
            const prTitle = context.payload.pull_request.title;
            const titleRegex = /^([\w\s,{}/.]+): .+/;
            
            if (!titleRegex.test(prTitle)) {
              core.setFailed(`PR title "${prTitle}" does not match required format: directory, ...: description`);
              return;
            }

            const match = prTitle.match(titleRegex);
            const dirPart = match[1];
            const directories = dirPart.split(',').map(d => d.trim());
            const missingDirs = [];
            for (const dir of directories) {
              const fullPath = path.join(process.env.GITHUB_WORKSPACE, dir);
              if (!fs.existsSync(fullPath)) {
                missingDirs.push(dir);
              }
            }
            
            if (missingDirs.length > 0) {
              core.setFailed(`The following directories in the PR title do not exist: ${missingDirs.join(', ')}`);
              return;
            }
            
            console.log('✅ PR title format is valid');