name: Check File Size

on:
  pull_request_target:
    types: [opened, synchronize, reopened]

permissions:
  contents: read
  pull-requests: write
  issues: write
  
jobs:
  check-size:
    runs-on: ubuntu-latest
    steps:
      - name: Check file sizes
        uses: actions/github-script@v7
        with:
          script: |
            const MAX_SIZE = 1024 * 1024; // 1 MB
            const prNumber = context.payload.pull_request.number;
            const owner = context.repo.owner;
            const repo = context.repo.repo;
            const pr = context.payload.pull_request;

            let page = 1;
            let oversized = [];

            while (true) {
              const response = await github.rest.pulls.listFiles({
                owner,
                repo,
                pull_number: prNumber,
                per_page: 100,
                page
              });

              const files = response.data;
              if (files.length === 0) break;

              for (const file of files) {
                // 只检查新增或修改文件
                if (!["added","modified","renamed","copied"].includes(file.status))
                  continue;

                const content = await github.rest.repos.getContent({
                  owner: pr.head.repo.owner.login,
                  repo: pr.head.repo.name,
                  path: file.filename,
                  ref: pr.head.sha
                });

                const size = content.data.size;

                if (size > MAX_SIZE) {
                  oversized.push(`- ${file.filename} (${size} bytes)`);
                }
              }

              if (files.length < 100) break;
              page++;
            }

            if (oversized.length > 0) {
              const body = `
            我们注意到以下文件的大小超过了 1MB, 请在压缩后再次提交 Pull Request:
            We have noted that the following files exceed 1MB in size. Please resubmit your pull request after compressing them:

            ${oversized.join("\n")}
              `.trim();

              await github.rest.issues.createComment({
                owner,
                repo,
                issue_number: prNumber,
                body
              });

              core.setFailed("File size check failed");
            } else {
              core.info("All changed files are under 1 MB.");
            }