export const KIMI_INSTRUCTION_RUNTIME_SOURCE = [
  "function createKimiInstructionRuntime(raw, { createHash, byteLength }) {",
  "  const schema = \"paperclip.kimi.instructions.v1\";",
  "  const fail = () => { throw new Error(\"Kimi instruction binding is missing or invalid\"); };",
  "  if (typeof raw !== \"string\" || byteLength(raw) > 200_000) fail();",
  "  let value;",
  "  try { value = JSON.parse(raw); } catch { fail(); }",
  "  if (!value || typeof value !== \"object\" || Array.isArray(value)",
  "    || Object.keys(value).sort().join(\",\") !== \"byteLength,content,digest,schema\"",
  "    || value.schema !== schema || typeof value.content !== \"string\"",
  "    || value.content.includes(\"\\0\") || !value.content.isWellFormed()",
  "    || byteLength(value.content) > 32_768 || value.byteLength !== byteLength(value.content)",
  "    || typeof value.digest !== \"string\") fail();",
  "  const digest = text => `sha256:${createHash(\"sha256\").update(text, \"utf8\").digest(\"hex\")}`;",
  "  const content = value.content;",
  "  if (value.digest !== digest(content)) fail();",
  "  const suffix = content.length === 0 ? \"\" : `\\n\\n${content}`;",
  "  const append = base => {",
  "    if (typeof base !== \"string\" || byteLength(base) > 2_097_152) fail();",
  "    return suffix.length === 0 || base.endsWith(suffix) ? base : `${base}${suffix}`;",
  "  };",
  "  return Object.freeze({",
  "    append,",
  "    receipt(sessionId, effectivePrompt) {",
  "      if (typeof sessionId !== \"string\" || !sessionId.trim() || append(effectivePrompt) !== effectivePrompt) fail();",
  "      return Object.freeze({ schema, sessionId, digest: value.digest,",
  "        byteLength: byteLength(content), effectiveDigest: digest(effectivePrompt),",
  "        effectiveByteLength: byteLength(effectivePrompt) });",
  "    },",
  "  });",
  "}",
].join("\n");

export const createKimiInstructionRuntime = new Function(`return (${KIMI_INSTRUCTION_RUNTIME_SOURCE});`)();