import path from 'path';
import { GITEA_REPOSITORY, PR_NUMBER, PR_HEAD_BRANCH, PR_BASE_BRANCH, getLLMConfig, FINDINGS_PATH, EXCLUSIONS_PATH } from './config.js';
import { loadRoles, getRoleIntro } from './roles.js';
import { getPRDiff, postComment, getCommitMessageBySha, getBotReviewOutcome, shouldSkipBotCommit } from './gitea.js';
import { analyzeWithRole, loadOldFindings, mergeFindings, sortByLevel, deduplicateWithAI, loadExclusions, applyExclusions, filterFalsePositivesWithAI } from './findings.js';
import { reconcileConversations, dropResolvedFindings, addCarriedFindings } from './resolve.js';
import { saveFindings, postFindingsReview, formatFindingsStatsLine } from './comments.js';
import { cloneRepo, commitAndPush, getRepoState } from './git.js';
import { validateJSONArrayFile, ensureJSONArrayFileExists } from './json.js';
import { runPreflight } from './preflight.js';
import { section, step, line, ok, warn, error } from './log.js';

const WORKSPACE = process.env.GITHUB_WORKSPACE || '/workspace';

function logFindingsStats(label, findings) {
  line(`${label}: ${formatFindingsStatsLine(findings)}`);
}

async function main() {
  section('AI Code Review Pipeline');
  step('Step1', 'Pipeline 啟動');
  line(`repo=${GITEA_REPOSITORY}  PR=#${PR_NUMBER}`);
  line(`${PR_HEAD_BRANCH} -> ${PR_BASE_BRANCH}`);

  if (!(await runPreflight(WORKSPACE))) {
    error('前置驗證未通過，終止流程');
    section('Pipeline 結束');
    process.exit(1);
  }

  const headSha = process.env.PR_HEAD_SHA || process.env.GITHUB_SHA || '';
  const headMessage = await getCommitMessageBySha(headSha);
  const headOutcome = getBotReviewOutcome(headMessage);
  line(`head check: sha=${headSha || 'empty'} outcome=${headOutcome}`);
  if (headMessage.includes('[ai-review-bot]') && headOutcome === 'failure') {
    error('偵測到 [ai-review-bot][failure]，直接讓 workflow 失敗');
    section('Pipeline 結束');
    process.exit(1);
  }

  if (await shouldSkipBotCommit()) {
    ok('偵測到 [ai-review-bot] 自動提交，直接完成 action');
    section('Pipeline 結束');
    process.exit(0);
  }

  step('Step2', 'PR 對話收斂');
  let reconcile = { resolvedFindings: [], carriedFindings: [], resolvedCount: 0, unresolvedCount: 0 };
  try {
    reconcile = await reconcileConversations();
    ok(`Step2 完成: resolved=${reconcile.resolvedCount} unresolved=${reconcile.unresolvedCount} 加回=${reconcile.carriedFindings.length}`);
  } catch (e) {
    warn(`Step2 對話收斂失敗（繼續執行）: ${e.message}`);
  }

  const { provider, baseURL, model } = getLLMConfig();
  if (!provider) {
    error('未設定任何 LLM API Key，請檢查 action inputs');
    process.exit(1);
  }
  line(`LLM: provider=${provider}  model=${model}  base_url=${baseURL}`);

  const roles = loadRoles();
  line(`已載入 ${roles.length} 個角色: [${roles.map(r => r.name).join(', ')}]`);

  let diff;
  try {
    diff = await getPRDiff();
    line(`diff 長度: ${diff.length} 字元`);
  } catch (e) {
    error(`取得 diff 失敗: ${e.message}`);
    process.exit(1);
  }

  if (!diff.trim()) {
    warn('diff 為空，無需審查');
    process.exit(0);
  }

  try {
    const intro = getRoleIntro(roles) + `\n\n> 🔍 服務：${provider}  模型：${model}`;
    await postComment(intro);
    ok('角色介紹 comment 發布成功');
  } catch (e) {
    warn(`comment 發布失敗（繼續執行）: ${e.message}`);
  }

  step('Step3', 'Findings 產生');
  const results = await Promise.allSettled(roles.map(role => analyzeWithRole(role, diff)));
  const newFindings = [];
  for (let i = 0; i < results.length; i++) {
    if (results[i].status === 'fulfilled') {
      newFindings.push(...results[i].value);
    } else {
      warn(`[${roles[i].name}] 分析失敗（跳過）: ${results[i].reason?.message}`);
    }
  }
  ok(`Step3 完成: 新 findings 總計 ${newFindings.length} 筆`);
  logFindingsStats('Step3 統計', newFindings);

  step('Step4', 'Findings 合併與語意去重');
  let repoDir;
  try {
    repoDir = cloneRepo(WORKSPACE);
  } catch (e) {
    warn(`clone repo 失敗（繼續執行）: ${e.message}`);
  }
  const repoState = repoDir ? getRepoState(repoDir) : null;
  if (repoState) {
    line(`repo 狀態: branch=${repoState.branch || 'detached'} commit=${repoState.shortSha || 'unknown'} commit_time=${repoState.commitTime || 'unknown'} path=${repoState.repoDir}`);
  }
  let oldFindings = loadOldFindings(repoDir || WORKSPACE);
  logFindingsStats('Step4 舊 findings 統計', oldFindings);
  const beforeReconcile = oldFindings.length;
  oldFindings = dropResolvedFindings(oldFindings, reconcile.resolvedFindings);
  oldFindings = addCarriedFindings(oldFindings, reconcile.carriedFindings);
  line(`Step4 對話收斂套用: ${beforeReconcile} -> ${oldFindings.length} 筆（移除已解決 ${reconcile.resolvedFindings.length}、加回未解決 ${reconcile.carriedFindings.length}）`);
  logFindingsStats('Step4 收斂後舊 findings 統計', oldFindings);
  logFindingsStats('Step4 新 findings 統計', newFindings);
  const mergedFindings = mergeFindings(oldFindings, newFindings);
  ok(`Step4 merged findings total=${mergedFindings.length}`);
  logFindingsStats('Step4 合併後統計', mergedFindings);
  const deduped = await deduplicateWithAI(mergedFindings);
  logFindingsStats('Step4 AI 去重後統計', deduped);
  const sorted = sortByLevel(deduped);
  ok(`Step4 去重完成: ${mergedFindings.length} -> ${sorted.length} 筆`);
  logFindingsStats('Step4 排序後統計', sorted);

  step('Step5', 'AI 排除問題過濾');
  const exclusions = loadExclusions(repoDir || WORKSPACE, repoState, WORKSPACE);
  const ruleFiltered = applyExclusions(sorted, exclusions);
  logFindingsStats('Step5 規則排除後統計', ruleFiltered);
  const filtered = await filterFalsePositivesWithAI(ruleFiltered, exclusions);
  logFindingsStats('Step5 AI 誤報過濾後統計', filtered);
  ok(`Step5 完成: findings total=${filtered.length}`);

  step('Step6', 'Findings 寫入與 Review 發布');
  const reviewDir = repoDir || WORKSPACE;
  saveFindings(WORKSPACE, filtered, reviewDir);
  try {
    logFindingsStats('Step6 儲存 findings 統計', filtered);
    logFindingsStats('Step6 review summary 統計', filtered);
    logFindingsStats('Step6 review comments 統計', filtered);
    await postFindingsReview(filtered, {
      summaryFindings: filtered,
      commentFindings: filtered,
    });
    ok('Step6 完成');
  } catch (e) {
    warn(`review 發布失敗（繼續執行）: ${e.message}`);
  }

  step('Step7', 'JSON 格式驗證');
  const missingPaths = [];
  for (const relPath of [FINDINGS_PATH, EXCLUSIONS_PATH]) {
    const fullPath = path.join(reviewDir, relPath);
    try {
      const result = await validateJSONArrayFile(fullPath, relPath);
      if (!result.exists) missingPaths.push({ fullPath, relPath });
    } catch {
      process.exit(1);
    }
  }

  for (const { fullPath, relPath } of missingPaths) {
    ensureJSONArrayFileExists(fullPath, relPath);
  }

  step('Step8', '記憶區 Commit/Push');
  const reviewOutcome = filtered.some(f => f.level === 'critical') ? 'failure' : 'success';
  line(`review outcome=${reviewOutcome}`);
  await commitAndPush(WORKSPACE, repoDir || WORKSPACE, undefined, undefined, reviewOutcome);

  step('Step9', '嚴重問題檢查');
  const criticalCount = filtered.filter(f => f.level === 'critical').length;
  if (criticalCount > 0) {
    error(`發現 ${criticalCount} 個嚴重問題，workflow 結束（exit 1）`);
    section('Pipeline 結束');
    process.exit(1);
  }
  ok('無嚴重問題');
  ok('Pipeline 完成');
  section('Pipeline 結束');
}

main().catch(e => {
  error(`Runner failed: ${e.message}`);
  process.exit(1);
});