code-review/app/resolve.js

import { chatJSON } from './llm.js';
import { listAllReviewComments, resolvePullReviewComment, getFileContentAtRef } from './gitea.js';
import { line, ok, warn } from './log.js';

const EMPTY = { resolvedFindings: [], carriedFindings: [], resolvedCount: 0, unresolvedCount: 0 };

/** 取出 "**label**：value" 這一行的 value（單行）。 */
function fieldValue(body, label) {
  const m = body.match(new RegExp(`\\*\\*${label}\\*\\*[：:]\\s*(.+)`));
  return m ? m[1].trim() : '';
}

function levelToKey(raw) {
  if (!raw) return null;
  if (raw.includes('嚴重')) return 'critical';
  if (raw.includes('警告')) return 'warning';
  if (raw.includes('建議')) return 'info';
  return null;
}

/**
 * 嘗試把一則 review comment 內文解析回 bot 產生的 finding 欄位。
 * 同時支援 review comment（嚴重等級／審查員／問題／建議）與行內 critical comment（等級／審查員／建議）格式。
 * 不符合格式（例如人工自由留言）時回傳 null。
 */
export function parseBotReviewComment(body) {
  if (typeof body !== 'string' || !body.includes('**')) return null;
  const normalized = body.replace(/\r\n/g, '\n');
  const levelRaw = fieldValue(normalized, '嚴重等級') || fieldValue(normalized, '等級');
  const role = fieldValue(normalized, '審查員');
  const problem = fieldValue(normalized, '問題');
  const suggestion = fieldValue(normalized, '建議');
  const level = levelToKey(levelRaw);
  if (!level && !role) return null;
  if (!suggestion && !problem) return null;
  return {
    level: level || 'warning',
    role: role || 'AI Review',
    problem: problem || '',
    suggestion: suggestion || problem || '',
  };
}

/**
 * 把 PR 上的行內 review comment 依「檔案路徑 + 行號」收斂成對話（同一處的留言與回覆視為一段對話）。
 * 對話只要任一則 comment 帶有 resolver 即視為已解決；同時嘗試解析出該對話對應的 bot finding。
 */
export function groupConversations(comments) {
  const groups = new Map();
  for (const c of comments || []) {
    const filePath = typeof c?.path === 'string' ? c.path : '';
    const lineNum = Number(c?.position) || Number(c?.original_position) || 0;
    const key = `${filePath}|${lineNum}`;
    if (!groups.has(key)) {
      groups.set(key, { key, path: filePath, line: lineNum, commentIds: [], bodies: [], resolved: false, botFinding: null });
    }
    const g = groups.get(key);
    if (c?.id != null) g.commentIds.push(c.id);
    const body = typeof c?.body === 'string' ? c.body : '';
    if (body) g.bodies.push(body);
    if (c?.resolver) g.resolved = true;
    if (!g.botFinding) {
      const finding = parseBotReviewComment(body);
      if (finding) g.botFinding = { ...finding, location: lineNum ? `${filePath}:${lineNum}` : filePath };
    }
  }
  return [...groups.values()].map(g => ({ ...g, thread: g.bodies.join('\n---\n') }));
}

/** 取目標行附近的程式碼片段（含行號），讓 AI 對照判斷問題是否已解決。 */
export function codeWindow(content, lineNum, radius = 20) {
  if (!content) return '';
  const lines = content.split('\n');
  const center = Number.isFinite(lineNum) && lineNum > 0 ? lineNum - 1 : 0;
  const start = Math.max(0, center - radius);
  const end = Math.min(lines.length, center + radius + 1);
  return lines.slice(start, end).map((text, i) => `${start + i + 1}: ${text}`).join('\n');
}

/**
 * 批次請 AI 判斷每個對話指出的問題在最新程式碼中是否已解決。
 * 回傳與輸入等長、依 idx 對齊的 [{ idx, resolved }]；無法判斷一律視為未解決（寧可保留）。
 */
export async function judgeConversationsResolved(items, chatFn = chatJSON) {
  if (!items || items.length === 0) return [];
  const systemPrompt = `你是 🛡️ Paladin（聖騎士），公正的裁判。下面是一批 PR review 對話（JSON 陣列），每個對話包含：曾被指出的問題（thread）、問題所在檔案 path 與行號 line、以及該位置最新的程式碼片段 code。請逐一判斷「該對話指出的問題在最新程式碼中是否已被解決」。只回傳 JSON 陣列，每個元素為 {"idx": 數字, "resolved": true 或 false}，不要有其他文字。若資訊不足以判斷，resolved 一律填 false。`;
  const payload = items.map(it => ({ idx: it.idx, path: it.path, line: it.line, thread: it.thread, code: it.code }));
  const result = await chatFn(systemPrompt, JSON.stringify(payload));
  const byIdx = new Map(
    (Array.isArray(result) ? result : [])
      .filter(r => Number.isInteger(r?.idx))
      .map(r => [r.idx, r.resolved === true]),
  );
  return items.map(it => ({ idx: it.idx, resolved: byIdx.get(it.idx) === true }));
}

function pushCarried(target, conversation) {
  if (!conversation.botFinding) return;
  target.push({ ...conversation.botFinding, is_new: false });
}

/**
 * 對話收斂主流程：
 * 1. 取得 PR 所有行內 review comment，收斂成對話，跳過已 resolve 的；
 * 2. 取每個對話所在檔案的最新內容，請 AI 判斷問題是否已解決；
 * 3. 已解決者呼叫 Gitea resolve API 解決對話，並記錄其 finding（供移除舊問題）；
 * 4. 未解決且可解析為 bot finding 者，收集為「加回問題列表」清單。
 * 任一外部呼叫失敗都降級處理（保守視為未解決），不中斷整體 pipeline。
 */
export async function reconcileConversations(deps = {}) {
  const {
    listComments = listAllReviewComments,
    resolveComment = resolvePullReviewComment,
    getFileContent = getFileContentAtRef,
    judge = judgeConversationsResolved,
  } = deps;

  let comments;
  try {
    comments = await listComments();
  } catch (e) {
    warn(`取得 PR review comments 失敗，跳過對話收斂: ${e.message}`);
    return { ...EMPTY };
  }

  const conversations = groupConversations(comments);
  const open = conversations.filter(c => !c.resolved && c.commentIds.length > 0);
  const alreadyResolved = conversations.length - open.length;
  line(`對話收斂: 對話總數=${conversations.length} 已解決/不可處理=${alreadyResolved} 待判斷=${open.length}`);
  if (open.length === 0) return { ...EMPTY };

  const fileCache = new Map();
  for (const filePath of [...new Set(open.map(c => c.path).filter(Boolean))]) {
    fileCache.set(filePath, await getFileContent(filePath));
  }

  const items = open.map((c, idx) => ({
    idx,
    path: c.path,
    line: c.line,
    thread: c.thread,
    code: codeWindow(fileCache.get(c.path) || '', c.line),
  }));

  let verdicts;
  try {
    verdicts = await judge(items);
  } catch (e) {
    warn(`AI 判斷對話解決狀態失敗，全部視為未解決: ${e.message}`);
    verdicts = items.map(it => ({ idx: it.idx, resolved: false }));
  }
  const resolvedSet = new Set(verdicts.filter(v => v.resolved).map(v => v.idx));

  const resolvedFindings = [];
  const carriedFindings = [];
  let resolvedCount = 0;
  for (let i = 0; i < open.length; i++) {
    const c = open[i];
    if (resolvedSet.has(i)) {
      try {
        await resolveComment(c.commentIds[0]);
        resolvedCount += 1;
        if (c.botFinding) resolvedFindings.push({ ...c.botFinding, is_new: false });
        ok(`對話已解決並 resolve: ${c.path}:${c.line}`);
        continue;
      } catch (e) {
        warn(`resolve 對話失敗（保留為未解決）: ${c.path}:${c.line} error=${e.message}`);
      }
    }
    pushCarried(carriedFindings, c);
  }

  const unresolvedCount = open.length - resolvedCount;
  ok(`對話收斂完成: resolved=${resolvedCount} unresolved=${unresolvedCount} 加回 findings=${carriedFindings.length}`);
  return { resolvedFindings, carriedFindings, resolvedCount, unresolvedCount };
}

function fileOf(location) {
  return String(location || '').split(':')[0].trim();
}

function normalizeKey(text) {
  return String(text || '')
    .normalize('NFKC')
    .replace(/[\p{P}\p{S}\s]+/gu, '')
    .trim()
    .toLowerCase();
}

/** 以「檔案路徑 + 正規化建議內容」為簽章，對 line 漂移與標點差異穩定。 */
function findingSig(f) {
  return `${fileOf(f?.location)}|${normalizeKey(f?.suggestion)}`;
}

/**
 * 從 findings 中移除「已解決對話」對應的問題（以檔案路徑＋建議內容比對，避免行號漂移誤判）。
 */
export function dropResolvedFindings(findings, resolvedFindings = []) {
  if (!resolvedFindings || resolvedFindings.length === 0) return findings;
  const resolved = new Set(resolvedFindings.map(findingSig));
  return findings.filter(f => !resolved.has(findingSig(f)));
}

/**
 * 把「未解決對話」對應、但目前 findings 清單中已遺漏的問題加回（去重以檔案路徑＋建議內容為準）。
 */
export function addCarriedFindings(findings, carriedFindings = []) {
  if (!carriedFindings || carriedFindings.length === 0) return findings;
  const seen = new Set(findings.map(findingSig));
  const additions = carriedFindings.filter(f => {
    const sig = findingSig(f);
    if (seen.has(sig)) return false;
    seen.add(sig);
    return true;
  });
  if (additions.length > 0) ok(`加回未解決問題: ${additions.length} 筆`);
  return [...findings, ...additions];
}