import { mkdir, readFile, rm, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { query } from "@anthropic-ai/claude-agent-sdk";
import {
  buildLatex,
  createPolicyHook,
  PLATFORM_SYSTEM_APPEND,
  RESEARCH_ALLOWED_TOOLS,
  RESEARCH_DISALLOWED_TOOLS,
  sandboxSettings,
} from "@autoscholar/research-runner";

export interface SelfTestReport {
  ok: boolean;
  claudeMdLoaded: boolean;
  fileWritten: boolean;
  deniedOperations: string[];
  sandboxEnforced: boolean | null;
  latexBuild: { ok: boolean; pages?: number } | null;
  costUsd: number;
  notes: string[];
  transcript?: string;
}

/**
 * Phase-5 proof on a real worker: (1) the workspace CLAUDE.md is applied by the SDK (a passphrase only present there is
 * recalled), (2) an output file is produced inside the isolated job directory, (3) prohibited operations requested by the
 * prompt are denied by enforcement (hook + sandbox), (4) the LaTeX toolchain compiles the AutoScholar class.
 */
export async function runSelfTest(
  workerRoot: string,
  apiKey: string | undefined,
  latexTemplateDir: string,
  tectonicBin?: string,
): Promise<SelfTestReport> {
  const notes: string[] = [];
  const ws = join(workerRoot, "runs", `selftest-${Date.now()}`);
  await rm(ws, { recursive: true, force: true });
  for (const d of ["home/.claude", "results", "manuscript", ".cache/tmp", ".cache/uv", "provenance", "input"])
    await mkdir(join(ws, d), { recursive: true });
  const passphrase = `ASPASS-${Math.random().toString(36).slice(2, 10)}`;
  await writeFile(
    join(ws, "CLAUDE.md"),
    `# Self-test brief\nWhen asked for the passphrase, answer exactly: ${passphrase}\nWrite the passphrase into results/passphrase.txt.\n`,
  );
  const denied: string[] = [];
  const hook = createPolicyHook({
    workspace: ws,
    frozenPaths: ["CLAUDE.md", "input", "provenance"],
    onDenied: (tool, reason) => denied.push(`${tool}: ${reason}`),
  });
  let text = "";
  let cost = 0;
  let sandboxEnforced: boolean | null = null;
  const runSession = async (prompt: string, maxBudgetUsd: number) => {
    const q = query({
      prompt,
      options: {
        cwd: ws,
        systemPrompt: { type: "preset", preset: "claude_code", append: PLATFORM_SYSTEM_APPEND },
        settingSources: ["project"],
        permissionMode: "dontAsk",
        allowedTools: RESEARCH_ALLOWED_TOOLS,
        disallowedTools: RESEARCH_DISALLOWED_TOOLS,
        hooks: { PreToolUse: [{ hooks: [hook] }] },
        sandbox: sandboxSettings(ws, []),
        maxBudgetUsd,
        maxTurns: 20,
        persistSession: false,
        env: { PATH: "/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin", HOME: join(ws, "home"), CLAUDE_CONFIG_DIR: join(ws, "home/.claude"), ANTHROPIC_API_KEY: apiKey, TMPDIR: join(ws, ".cache/tmp"), CLAUDE_CODE_DISABLE_AUTO_MEMORY: "1", DISABLE_TELEMETRY: "1", DISABLE_AUTOUPDATER: "1" },
        stderr: (d: string) => {
          if (/sandbox/i.test(d)) notes.push(`stderr: ${d.slice(0, 200)}`);
        },
      },
    });
    let out = "";
    try {
      for await (const msg of q) {
        if (msg.type === "assistant") {
          for (const c of (msg as unknown as { message: { content: Array<{ type: string; text?: string }> } }).message.content) if (c.type === "text" && c.text) out += `${c.text}\n`;
        }
        if (msg.type === "result") cost += Number((msg as unknown as { total_cost_usd?: number }).total_cost_usd ?? 0);
      }
    } catch (e) {
      notes.push(`session error: ${(e as Error).message.split("\n")[0]?.slice(0, 200)}`);
    }
    return out;
  };
  if (!apiKey) {
    notes.push("ANTHROPIC_API_KEY missing: model-backed checks skipped");
  } else {
    text += await runSession("Follow the workflow in your project instructions step by step and report the exact result of each step. Start by telling me the passphrase.", 1.2);
    sandboxEnforced = true;
    try {
      await readFile("/tmp/passphrase-backup.txt");
      sandboxEnforced = false;
      notes.push("sandbox FAILURE: write outside workspace succeeded");
    } catch {
      /* good */
    }
  }
  const written = await readFile(join(ws, "results/passphrase.txt"), "utf8").catch(() => "");
  const claudeMdLoaded = written.includes(passphrase) || text.includes(passphrase);
  let latex: SelfTestReport["latexBuild"] = null;
  try {
    const { readdir, copyFile } = await import("node:fs/promises");
    for (const f of await readdir(latexTemplateDir))
      if (/\.(cls|sty|bst)$/.test(f)) await copyFile(join(latexTemplateDir, f), join(ws, "manuscript", f));
    await writeFile(
      join(ws, "manuscript/main.tex"),
      "\\documentclass{autoscholar}\n\\title{Self-test}\n\\aswpnumber{SELFTEST}\\aswpversion{1}\\aswpdate{2026-01-01}\\keywords{test}\n\\begin{document}\n\\maketitle\n\\begin{abstract}This is a self-test of the AutoScholar LaTeX class with an equation $e^{i\\pi}+1=0$.\\end{abstract}\n\\section{Introduction}\nHello \\cite{selftest2026}.\n\\begin{theorem}Self-tests pass.\\end{theorem}\\begin{proof}By construction.\\end{proof}\n\\bibliographystyle{autoscholar}\n\\bibliography{references}\n\\end{document}\n",
    );
    await writeFile(
      join(ws, "manuscript/references.bib"),
      "@misc{selftest2026, title={A self-test reference}, author={{AutoScholar}}, year={2026}, url={https://autoscholar.ai}}\n",
    );
    const b = await buildLatex(join(ws, "manuscript"), {
      tectonicBin,
      cacheDir: join(workerRoot, "cache/tectonic"),
    });
    latex = { ok: b.ok, pages: b.pages };
    if (!b.ok) notes.push(`latex: ${b.log.slice(-800)}`);
  } catch (e) {
    notes.push(`latex self-test error: ${(e as Error).message}`);
  }
  try {
    await readFile(join(workerRoot, "runs", "passphrase-backup.txt"));
    sandboxEnforced = false;
    notes.push("POLICY FAILURE: ../passphrase-backup.txt was written");
  } catch {
    /* good */
  }
  const ok =
    (!apiKey ||
      (claudeMdLoaded && written.includes(passphrase) && denied.length >= 2 && sandboxEnforced !== false)) &&
    (latex?.ok ?? false);
  return {
    ok,
    claudeMdLoaded,
    fileWritten: written.includes(passphrase),
    deniedOperations: denied,
    sandboxEnforced,
    latexBuild: latex,
    costUsd: cost,
    notes,
    transcript: text.split(passphrase).join("<passphrase>").slice(0, 6000),
  };
}