#!/usr/bin/env node
/**
 * Upload files changed between ORIG_HEAD and HEAD to AnythingLLM (post-merge / after pull).
 * Requires: ANYTHINGLLM_BASE_URL, ANYTHINGLLM_API_KEY, workspace slug via ANYTHINGLLM_WORKSPACE_SLUG or .anythingllm.json
 */
import { execFileSync } from "node:child_process";
import * as fs from "node:fs";
import * as fsPromises from "node:fs/promises";
import * as path from "node:path";
import { fileURLToPath } from "node:url";
import ignore from "ignore";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

const ALWAYS_IGNORE = [".git/", "node_modules/", "**/node_modules/"].join("\n");

const readJson = (p) => {
  const raw = fs.readFileSync(p, "utf8");
  return JSON.parse(raw);
};

const git = (repoRoot, args) => {
  return execFileSync("git", args, {
    cwd: repoRoot,
    encoding: "utf8",
    stdio: ["ignore", "pipe", "pipe"],
  }).trim();
};

const parseArgs = () => {
  const out = { repoRoot: process.cwd(), uploadAll: false, uploadPrefix: "" };
  const argv = process.argv.slice(2);
  for (let i = 0; i < argv.length; i += 1) {
    if (argv[i] === "--repo-root" && argv[i + 1]) {
      out.repoRoot = path.resolve(argv[i + 1]);
      i += 1;
      continue;
    }
    if (argv[i] === "--upload-all") {
      out.uploadAll = true;
      continue;
    }
    if (argv[i] === "--upload-prefix" && argv[i + 1]) {
      out.uploadPrefix = String(argv[i + 1] ?? "").trim();
      i += 1;
      continue;
    }
  }
  return out;
};

const walkFiles = async (dir) => {
  const out = [];
  const scan = async (d) => {
    const entries = await fsPromises.readdir(d, { withFileTypes: true });
    for (const e of entries) {
      const p = path.join(d, e.name);
      if (e.isSymbolicLink()) {
        continue;
      }
      if (e.isDirectory()) {
        await scan(p);
        continue;
      }
      if (e.isFile()) {
        out.push(p);
      }
    }
  };
  await scan(dir);
  return out;
};

const toPosixRel = (root, abs) => {
  const rel = path.relative(root, abs);
  return rel.split(path.sep).join("/");
};

const loadWorkspaceSlug = (repoRoot) => {
  const env = process.env.ANYTHINGLLM_WORKSPACE_SLUG?.trim();
  if (env) {
    return env;
  }
  const cfgPath = path.join(repoRoot, ".anythingllm.json");
  try {
    const j = readJson(cfgPath);
    if (typeof j.workspaceSlug === "string" && j.workspaceSlug.trim().length > 0) {
      return j.workspaceSlug.trim();
    }
  } catch {
    /* missing */
  }
  // smart_ide integration: resolve slug from projects/<id>/conf.json when available.
  // This avoids having to write per-repo config files into the target clones.
  try {
    const smartIdeRoot = path.resolve(__dirname, "..", "..");
    const projectsDir = path.join(smartIdeRoot, "projects");
    if (!fs.existsSync(projectsDir)) {
      return "";
    }
    const repoReal = fs.realpathSync(repoRoot);
    const envNameRaw = process.env.SMART_IDE_ENV?.trim() ?? "";
    const envName = envNameRaw === "test" || envNameRaw === "pprod" || envNameRaw === "prod" ? envNameRaw : "test";

    for (const ent of fs.readdirSync(projectsDir, { withFileTypes: true })) {
      if (!ent.isDirectory()) {
        continue;
      }
      const confPath = path.join(projectsDir, ent.name, "conf.json");
      if (!fs.existsSync(confPath)) {
        continue;
      }
      let conf;
      try {
        conf = readJson(confPath);
      } catch {
        continue;
      }
      const projectPath = typeof conf?.project_path === "string" ? conf.project_path.trim() : "";
      if (!projectPath) {
        continue;
      }
      const absProjectPath = path.isAbsolute(projectPath)
        ? projectPath
        : path.resolve(smartIdeRoot, projectPath);
      let projectReal;
      try {
        projectReal = fs.realpathSync(absProjectPath);
      } catch {
        continue;
      }
      if (projectReal !== repoReal) {
        continue;
      }

      const slugCfg = conf?.smart_ide?.anythingllm_workspace_slug;
      if (typeof slugCfg === "string" && slugCfg.trim().length > 0) {
        return slugCfg.trim();
      }
      if (slugCfg && typeof slugCfg === "object") {
        const slug = slugCfg?.[envName];
        if (typeof slug === "string" && slug.trim().length > 0) {
          return slug.trim();
        }
      }
    }
  } catch {
    // ignore and fall back to empty (explicit skip handled by caller)
  }
  return "";
};

const normalizeApiKey = (raw) => {
  const t = raw.trim();
  const m = /^Bearer\s+/i.exec(t);
  return m ? t.slice(m[0].length).trim() : t;
};

const readPositiveIntEnv = (name, fallback) => {
  const raw = process.env[name];
  if (!raw || raw.trim().length === 0) {
    return fallback;
  }
  const s = raw.trim();
  if (!/^\d+$/.test(s)) {
    console.error(
      `anythingllm-pull-sync: invalid ${name}=${JSON.stringify(raw)}; using default ${fallback}`,
    );
    return fallback;
  }
  const n = Number(s);
  if (!Number.isFinite(n) || n <= 0) {
    console.error(
      `anythingllm-pull-sync: invalid ${name}=${JSON.stringify(raw)}; using default ${fallback}`,
    );
    return fallback;
  }
  return n;
};

const uploadOne = async (baseUrl, apiKey, slug, absPath, uploadName) => {
  const root = baseUrl.replace(/\/+$/, "");
  const buf = await fsPromises.readFile(absPath);
  const body = new FormData();
  body.append("file", new Blob([buf]), uploadName);
  body.append("addToWorkspaces", slug);
  const res = await fetch(`${root}/api/v1/document/upload`, {
    method: "POST",
    headers: { Authorization: `Bearer ${apiKey}` },
    body,
  });
  const text = await res.text();
  let parsed;
  try {
    parsed = JSON.parse(text);
  } catch {
    throw new Error(`non-JSON ${res.status}: ${text.slice(0, 200)}`);
  }
  if (!res.ok || parsed.success !== true) {
    throw new Error(`${res.status}: ${text.slice(0, 400)}`);
  }
};

const main = async () => {
  const { repoRoot, uploadAll, uploadPrefix } = parseArgs();
  const baseUrl = process.env.ANYTHINGLLM_BASE_URL?.trim() ?? "";
  const apiKeyRaw = process.env.ANYTHINGLLM_API_KEY?.trim() ?? "";
  const maxBytes = readPositiveIntEnv("ANYTHINGLLM_SYNC_MAX_FILE_BYTES", 5_242_880);
  const maxFiles = readPositiveIntEnv("ANYTHINGLLM_SYNC_MAX_FILES", 200);

  if (!baseUrl || !apiKeyRaw) {
    console.error(
      "anythingllm-pull-sync: missing ANYTHINGLLM_BASE_URL or ANYTHINGLLM_API_KEY — skip.",
    );
    process.exit(0);
  }
  const apiKey = normalizeApiKey(apiKeyRaw);
  const slug = loadWorkspaceSlug(repoRoot);
  if (!slug) {
    console.error(
      "anythingllm-pull-sync: set ANYTHINGLLM_WORKSPACE_SLUG or .anythingllm.json { \"workspaceSlug\": \"…\" } — skip.",
    );
    process.exit(0);
  }

  if (uploadAll === true) {
    const ignorePath = path.join(repoRoot, ".4nkaiignore");
    let userRules = "";
    try {
      userRules = await fsPromises.readFile(ignorePath, "utf8");
    } catch {
      userRules = "";
    }
    const ig = ignore();
    ig.add(ALWAYS_IGNORE);
    ig.add(userRules);

    let uploaded = 0;
    let skipped = 0;
    const errors = [];

    const absFiles = await walkFiles(repoRoot);
    for (const abs of absFiles) {
      const rel = toPosixRel(repoRoot, abs);
      if (rel.length === 0 || rel.startsWith("..")) {
        skipped += 1;
        continue;
      }
      if (ig.ignores(rel)) {
        skipped += 1;
        continue;
      }
      let st;
      try {
        st = await fsPromises.stat(abs);
      } catch {
        skipped += 1;
        continue;
      }
      if (!st.isFile()) {
        skipped += 1;
        continue;
      }
      if (st.size > maxBytes) {
        skipped += 1;
        continue;
      }
      if (uploaded >= maxFiles) {
        console.error("anythingllm-pull-sync: cap reached (ANYTHINGLLM_SYNC_MAX_FILES).");
        break;
      }
      const relPosix = rel.split(path.sep).join("/");
      const baseName = relPosix.split("/").join("__");
      const uploadName =
        uploadPrefix && uploadPrefix.length > 0 ? `${uploadPrefix}__${baseName}` : baseName;
      try {
        await uploadOne(baseUrl, apiKey, slug, abs, uploadName);
        uploaded += 1;
      } catch (e) {
        errors.push(`${relPosix}: ${e instanceof Error ? e.message : String(e)}`);
      }
    }

    console.error(
      `anythingllm-pull-sync: mode=upload-all uploaded=${uploaded} skipped=${skipped} errors=${errors.length}`,
    );
    for (const line of errors.slice(0, 20)) {
      console.error(line);
    }
    if (errors.length > 20) {
      console.error(`… ${errors.length - 20} more`);
    }
    process.exit(errors.length > 0 ? 1 : 0);
  }

  try {
    git(repoRoot, ["rev-parse", "-q", "--verify", "ORIG_HEAD"]);
  } catch {
    console.error("anythingllm-pull-sync: no ORIG_HEAD (not a merge/pull) — skip.");
    process.exit(0);
  }

  let names;
  try {
    const out = git(repoRoot, [
      "diff",
      "--name-only",
      "--diff-filter=ACMRT",
      "ORIG_HEAD",
      "HEAD",
    ]);
    names = out.length > 0 ? out.split("\n").filter(Boolean) : [];
  } catch (e) {
    console.error(
      "anythingllm-pull-sync: git diff failed — skip.",
      e instanceof Error ? e.message : String(e),
    );
    process.exit(0);
  }

  if (names.length === 0) {
    console.error("anythingllm-pull-sync: no file changes between ORIG_HEAD and HEAD.");
    process.exit(0);
  }

  const ignorePath = path.join(repoRoot, ".4nkaiignore");
  let userRules = "";
  try {
    userRules = await fsPromises.readFile(ignorePath, "utf8");
  } catch {
    userRules = "";
  }
  const ig = ignore();
  ig.add(ALWAYS_IGNORE);
  ig.add(userRules);

  let uploaded = 0;
  let skipped = 0;
  const errors = [];

  for (const rel of names) {
    if (rel.includes("..") || path.isAbsolute(rel)) {
      skipped += 1;
      continue;
    }
    const posix = rel.split(path.sep).join("/");
    if (ig.ignores(posix)) {
      skipped += 1;
      continue;
    }
    const abs = path.join(repoRoot, rel);
    let st;
    try {
      st = await fsPromises.stat(abs);
    } catch {
      skipped += 1;
      continue;
    }
    if (!st.isFile()) {
      skipped += 1;
      continue;
    }
    if (st.size > maxBytes) {
      skipped += 1;
      continue;
    }
    if (uploaded >= maxFiles) {
      console.error("anythingllm-pull-sync: cap reached (ANYTHINGLLM_SYNC_MAX_FILES).");
      break;
    }
    const uploadName = posix.split("/").join("__");
    try {
      await uploadOne(baseUrl, apiKey, slug, abs, uploadName);
      uploaded += 1;
    } catch (e) {
      errors.push(`${posix}: ${e instanceof Error ? e.message : String(e)}`);
    }
  }

  console.error(
    `anythingllm-pull-sync: uploaded=${uploaded} skipped=${skipped} errors=${errors.length}`,
  );
  for (const line of errors.slice(0, 20)) {
    console.error(line);
  }
  if (errors.length > 20) {
    console.error(`… ${errors.length - 20} more`);
  }
  process.exit(errors.length > 0 ? 1 : 0);
};

main().catch((e) => {
  console.error("anythingllm-pull-sync:", e);
  process.exit(1);
});