import assert from "node:assert/strict";
import { existsSync, readFileSync, realpathSync } from "node:fs";
import { join, resolve } from "node:path";
import test from "node:test";
import { Agent } from "@mastra/core/agent";
import {
  jyotishSkillBinding,
  jyotishSkillBoundProcessor,
  jyotishSkillMethodBlock,
  jyotishSkillPackage,
  jyotishSkillRuntimePath,
} from "../src/mastra/skill-binding.ts";

const model = { specificationVersion: "v2", provider: "probe", modelId: "probe" } as never;

function probeAgent(options: Record<string, unknown>) {
  return new Agent({ id: "skill-binding-probe", name: "Probe", model, instructions: "x", ...options } as never);
}

function liveSkillBody() {
  const live = readFileSync(resolve(jyotishSkillPackage.resolvedPath, "SKILL.md"), "utf8");
  return live.slice(live.indexOf("---", 3) + 4).trim();
}

function boundMethodText() {
  const opened = jyotishSkillMethodBlock.indexOf(`<jyotish-skill name="${jyotishSkillPackage.name}"`);
  const closed = jyotishSkillMethodBlock.lastIndexOf("</jyotish-skill>");
  assert.ok(opened >= 0 && closed > opened);
  return jyotishSkillMethodBlock.slice(jyotishSkillMethodBlock.indexOf("\n", opened) + 1, closed).trim();
}

test("the method the model follows is the live skill, not a hashed snapshot", () => {
  const body = liveSkillBody();
  const bound = boundMethodText();

  assert.match(jyotishSkillMethodBlock, new RegExp(`name="${jyotishSkillPackage.name}"`));
  assert.doesNotMatch(jyotishSkillMethodBlock, /<jyotish-skill name="[^"]+" version="/);
  for (const line of bound.split("\n")) {
    if (line.length === 0) continue;
    assert.ok(body.includes(line), line.slice(0, 80));
  }
  assert.ok(jyotishSkillRuntimePath.endsWith(jyotishSkillPackage.name));
  assert.equal(jyotishSkillRuntimePath.includes("/versions/"), false);
  assert.equal(existsSync(join(jyotishSkillRuntimePath, "versions")), false);
  assert.equal(
    realpathSync(join(jyotishSkillRuntimePath, "SKILL.md")),
    realpathSync(join(jyotishSkillPackage.resolvedPath, "SKILL.md")),
  );
});

test("the bound method is the runtime excerpt, not the maintainer manual", () => {
  // Independent source: the commercial SKILL.md still contains both the
  // answering contract and the repo-construction notes. Binding the whole
  // file is what pushed Mastra past its 500-line warning; the excerpt keeps
  // the contract and drops the notes.
  const body = liveSkillBody();
  const bound = boundMethodText();

  for (const heading of ["商业运行时路由", "关联技法完整调取", "强制工作流", "五层硬约束", "核心方法论", "注意事项", "commercial_skill_truth_overlay"]) {
    assert.ok(body.includes(heading), heading);
    assert.ok(bound.includes(heading), heading);
  }
  for (const phrase of ["全谱系真实调用", "P0/P1 观察层", "网页对话的技法审计表由界面折叠展示", "静态分析10步"]) {
    assert.ok(bound.includes(phrase), phrase);
  }
  for (const heading of ["施工判断原则", "冲顶路线", "37大子命令", "验证与错题体系", "开源复用边界冻结"]) {
    assert.ok(body.includes(heading), heading);
    assert.equal(bound.includes(heading), false, heading);
  }
  assert.ok(body.includes("~/.workbuddy/skills"));
  assert.equal(bound.includes("~/.workbuddy/skills"), false);
  assert.ok(bound.split("\n").length < 500, `${bound.split("\n").length} lines`);
  assert.ok(bound.length < body.length * 0.7, `${bound.length} of ${body.length}`);
});

test("binding the method costs a fraction of activating the skill", async () => {
  // What activation would have sent, measured rather than assumed: Mastra answers
  // it with the entrypoint plus a flat listing of every file in the package, and
  // that listing is the majority of the bytes. Nothing carries over between
  // requests, so it was resent on every turn of every conversation.
  const activation = probeAgent({ skills: [jyotishSkillRuntimePath] });
  const skillTool = (await activation.getToolsForExecution({ runId: "probe" })).skill as {
    execute: (input: unknown, context: unknown) => Promise<unknown>;
  };
  const activated = await skillTool.execute(
    { name: jyotishSkillPackage.name },
    { runId: "probe" } as never,
  );
  const activationBytes = Buffer.byteLength(
    typeof activated === "string" ? activated : JSON.stringify(activated),
    "utf8",
  );
  const boundBytes = Buffer.byteLength(jyotishSkillMethodBlock, "utf8");

  assert.ok(activationBytes > boundBytes * 2, `${activationBytes} vs ${boundBytes}`);
  assert.ok(boundBytes < activationBytes * 0.45, `${boundBytes} of ${activationBytes}`);
});

test("agents that bind the method are not given a tool to load it", async () => {
  const bound = probeAgent(jyotishSkillBinding());
  const toolNames = Object.keys(await bound.getToolsForExecution({ runId: "probe" }));

  assert.deepEqual(toolNames, ["skill_read"]);
  // The skill is still declared, so the references the method names by path stay
  // reachable for the one question the delivered sections do not cover.
  assert.equal(
    (await bound.listSkills()).some((skill) => skill.name === jyotishSkillPackage.name),
    true,
  );
});

test("a prompt assembled without the method stops the run instead of answering", () => {
  const abortReasons: string[] = [];
  const abort = ((reason?: string) => {
    abortReasons.push(reason ?? "");
    throw new Error("aborted");
  }) as never;
  const step = (system: unknown[]) => jyotishSkillBoundProcessor.processInputStep({
    messageList: { getAllSystemMessages: () => system },
    abort,
  } as never);

  assert.throws(() => step([{ role: "system", content: "you are a guide" }]), /aborted/);
  assert.match(abortReasons[0], /not bound into the system prompt/);

  // A prompt that does carry the method, and a prompt that cannot be read at all,
  // both pass: this guard exists to catch a missing method, not to become a new
  // way for a run to fail.
  assert.doesNotThrow(() => step([{ role: "system", content: jyotishSkillMethodBlock }]));
  assert.doesNotThrow(() => step([]));
});

test("only chart-answering agents bind the method", () => {
  const mastra = readFileSync(new URL("../src/mastra/index.ts", import.meta.url), "utf8");
  const chart = mastra.slice(
    mastra.indexOf("const jyotishInstructions"),
    mastra.indexOf("const generalJyotishInstructions"),
  );
  const general = mastra.slice(
    mastra.indexOf("const generalJyotishInstructions"),
    mastra.indexOf("const onboardingInstructions"),
  );
  const onboarding = mastra.slice(
    mastra.indexOf("const onboardingInstructions"),
    mastra.indexOf("const dailyStarlanguageInstructions"),
  );
  const daily = mastra.slice(
    mastra.indexOf("const dailyStarlanguageInstructions"),
    mastra.indexOf("const birthTimeGuideInstructions"),
  );

  assert.match(chart, /\.\.\.jyotishSkillBinding\(\)/);
  assert.match(chart, /\$\{jyotishSkillMethodBlock\}/);
  for (const [name, source] of [["general", general], ["onboarding", onboarding], ["daily", daily]] as const) {
    assert.doesNotMatch(source, /jyotishSkillBinding|jyotishSkillMethodBlock/, name);
  }
});