name: "Diff Display and Update Cache"
description: "Compare current top5 results with previous cache, display new additions, and update the cache file."

inputs:
  currentResults:
    description: "The JSON string of current top5 results from malware-check action."
    required: true
  orgName:
    description: "The GitHub organization name."
    required: true

runs:
  using: "composite"
  steps:
    - name: Compare current results with previous cache and update cache
      id: diff-update
      uses: actions/github-script@v7
      env:
        INPUT_ORGNAME: ${{ inputs.orgName }}
      with:
        script: |
          const GREEN = "\x1b[32m";
          const YELLOW = "\x1b[33m";
          const CYAN = "\x1b[36m";
          const RESET = "\x1b[0m";
          
          const owner = context.repo.owner;
          const repo = context.repo.repo;
          // currentResults を入力から取得
          const currentResults = JSON.parse(core.getInput('currentResults') || "{}");
          let previousResults = {};
          let fileSha = null;
          try {
            const fileResponse = await github.rest.repos.getContent({
              owner,
              repo,
              path: 'top5_cache.json',
              ref: 'main'
            });
            const content = Buffer.from(fileResponse.data.content, 'base64').toString('utf8');
            previousResults = JSON.parse(content);
            fileSha = fileResponse.data.sha;
          } catch (error) {
            if (error.status === 404) {
              core.info("No previous cache found. Starting fresh.");
              previousResults = {};
            } else {
              throw error;
            }
          }
          
          // 差分算出: 各対象リポジトリごとに、current にあって previous にない項目（新規追加）のみ抽出
          const differences = {};
          for (const repoName in currentResults) {
            const currList = currentResults[repoName] || [];
            const prevList = previousResults[repoName] || [];
            const prevNames = new Set(prevList.map(item => item.full_name));
            const newItems = currList.filter(item => !prevNames.has(item.full_name));
            if (newItems.length > 0) {
              differences[repoName] = newItems;
            }
          }
          
          if (Object.keys(differences).length === 0) {
            core.info(`${YELLOW}No new additions detected compared to previous state.${RESET}`);
          } else {
            for (const repoName in differences) {
              core.info(`\nFor organization repo: ${repoName}`);
              differences[repoName].forEach(item => {
                core.info(`${GREEN}New addition: ${item.full_name}${RESET} | ${CYAN}Created: ${item.created_at} | Stars: ${item.stargazers_count} | URL: ${item.html_url}`);
              });
            }
          }
          
          // キャッシュの更新: currentResults を top5_cache.json として保存
          const newContent = Buffer.from(JSON.stringify(currentResults, null, 2)).toString('base64');
          const commitMessage = `Update top5 cache: ${new Date().toISOString()}`;
          await github.rest.repos.createOrUpdateFileContents({
              owner,
              repo,
              path: 'top5_cache.json',
              message: commitMessage,
              content: newContent,
              sha: fileSha || undefined
          });