import { api } from "@/db/supabase";
import { CodeAnalysisEngine } from "@/services/codeAnalysis";

type GithubTreeItem = { path: string; type: "blob" | "tree"; size?: number; url: string; sha: string };

const TEXT_EXTENSIONS = [
  ".js", ".ts", ".tsx", ".jsx", ".py", ".java", ".go", ".rs", ".cpp", ".c", ".h", ".cs", ".php", ".rb", ".kt", ".swift", ".sql", ".sh", ".json", ".yml", ".yaml", ".md"
];
const MAX_FILE_SIZE_BYTES = 200 * 1024;
const MAX_ANALYZE_FILES = Number(import.meta.env.VITE_MAX_ANALYZE_FILES || 40);
const LLM_CONCURRENCY = Number(import.meta.env.VITE_LLM_CONCURRENCY || 2);
const LLM_GAP_MS = Number(import.meta.env.VITE_LLM_GAP_MS || 500);

const isTextFile = (p: string) => TEXT_EXTENSIONS.some(ext => p.toLowerCase().endsWith(ext));
const matchExclude = (p: string, ex: string[]) => ex.some(e => p.includes(e.replace(/^\//, "")) || (e.endsWith("/**") && p.startsWith(e.slice(0, -3).replace(/^\//, ""))));

async function githubApi<T>(url: string, token?: string): Promise<T> {
  const headers: Record<string, string> = { "Accept": "application/vnd.github+json" };
  const t = token || (import.meta.env.VITE_GITHUB_TOKEN as string | undefined);
  if (t) headers["Authorization"] = `Bearer ${t}`;
  const res = await fetch(url, { headers });
  if (!res.ok) {
    if (res.status === 403) throw new Error("GitHub API 403：请配置 VITE_GITHUB_TOKEN 或确认仓库权限/频率限制");
    throw new Error(`GitHub API ${res.status}: ${url}`);
  }
  return res.json() as Promise<T>;
}

export async function runRepositoryAudit(params: {
  projectId: string;
  repoUrl: string;
  branch?: string;
  exclude?: string[];
  githubToken?: string;
  createdBy?: string;
}) {
  const branch = params.branch || "main";
  const excludes = params.exclude || [];
  const task = await api.createAuditTask({
    project_id: params.projectId,
    task_type: "repository",
    branch_name: branch,
    exclude_patterns: excludes,
    scan_config: {},
    created_by: params.createdBy
  } as any);

  try {
    const m = params.repoUrl.match(/github\.com\/(.+?)\/(.+?)(?:\.git)?$/i);
    if (!m) throw new Error("仅支持 GitHub 仓库 URL，例如 https://github.com/owner/repo");
    const owner = m[1];
    const repo = m[2];

    const treeUrl = `https://api.github.com/repos/${owner}/${repo}/git/trees/${encodeURIComponent(branch)}?recursive=1`;
    const tree = await githubApi<{ tree: GithubTreeItem[] }>(treeUrl, params.githubToken);
    let files = (tree.tree || []).filter(i => i.type === "blob" && isTextFile(i.path) && !matchExclude(i.path, excludes));
    // 采样限制，优先分析较小文件与常见语言
    files = files
      .sort((a, b) => (a.path.length - b.path.length))
      .slice(0, MAX_ANALYZE_FILES);

    let totalFiles = 0, totalLines = 0, createdIssues = 0;
    let index = 0;
    const worker = async () => {
      while (true) {
        const current = index++;
        if (current >= files.length) break;
        const f = files[current];
        totalFiles++;
        try {
          const rawUrl = `https://raw.githubusercontent.com/${owner}/${repo}/${encodeURIComponent(branch)}/${f.path}`;
          const contentRes = await fetch(rawUrl);
          if (!contentRes.ok) { await new Promise(r=>setTimeout(r, LLM_GAP_MS)); continue; }
          const content = await contentRes.text();
          if (content.length > MAX_FILE_SIZE_BYTES) { await new Promise(r=>setTimeout(r, LLM_GAP_MS)); continue; }
          totalLines += content.split(/\r?\n/).length;
          const language = (f.path.split(".").pop() || "").toLowerCase();
          const analysis = await CodeAnalysisEngine.analyzeCode(content, language);
          const issues = analysis.issues || [];
          createdIssues += issues.length;
          for (const issue of issues) {
            await api.createAuditIssue({
              task_id: (task as any).id,
              file_path: f.path,
              line_number: issue.line || null,
              column_number: issue.column || null,
              issue_type: issue.type || "maintainability",
              severity: issue.severity || "low",
              title: issue.title || "Issue",
              description: issue.description || null,
              suggestion: issue.suggestion || null,
              code_snippet: issue.code_snippet || null,
              ai_explanation: issue.xai ? JSON.stringify(issue.xai) : (issue.ai_explanation || null),
              status: "open",
              resolved_by: null,
              resolved_at: null
            } as any);
          }
          if (totalFiles % 10 === 0) {
            await api.updateAuditTask((task as any).id, { status: "running", total_files: totalFiles, scanned_files: totalFiles, total_lines: totalLines, issues_count: createdIssues } as any);
          }
        } catch {}
        await new Promise(r=>setTimeout(r, LLM_GAP_MS));
      }
    };

    const pool = Array.from({ length: Math.min(LLM_CONCURRENCY, files.length) }, () => worker());
    await Promise.all(pool);

    await api.updateAuditTask((task as any).id, { status: "completed", total_files: totalFiles, scanned_files: totalFiles, total_lines: totalLines, issues_count: createdIssues, quality_score: 0 } as any);
    return (task as any).id as string;
  } catch (e) {
    await api.updateAuditTask((task as any).id, { status: "failed" } as any);
    throw e;
  }
}