/**
 * 预设保真度（conformance）：预设声明什么，发出去的 messages[] 就得是什么。
 *
 * 每个用例对应一条「预设是否真的实现了」的断言：
 *   顺序 / 双过滤 / 未引用条目 / 角色 / 宏 / 历史多轮 / 深度插入 / 生成参数 / squash
 */
import { describe, expect, it } from "vitest";
import type {
  ChatMessage,
  CompleteResult,
  LlmProvider,
} from "../src/llm/client.js";
import { wrapLlmForSession, resolveSquashForPreset } from "../src/llm/preset-wrapper.js";
import { importSillyTavernPreset, readSquashMode } from "../src/preset/importer.js";
import { assemblePlayWorkerMessages } from "../src/preset/play-frame.js";
import type { WorldInfoPack } from "../src/preset/world-info-pack.js";

type RawPreset = Record<string, unknown>;

/** 一份「把该有的都放上」的 ST 预设：顺序、双过滤、宏、深度插入、未引用条目。 */
function richPreset(extra: RawPreset = {}): RawPreset {
  return {
    name: "保真度样本",
    temperature: 0.77,
    top_p: 0.9,
    openai_max_tokens: 777,
    squash_system_messages: false,
    prompts: [
      { identifier: "main", name: "主提示", role: "system", content: "MAIN {{char}}" },
      { identifier: "style", name: "文风", role: "system", content: "文风：克制" },
      {
        identifier: "personaDescription",
        name: "用户角色",
        role: "system",
        marker: true,
      },
      {
        identifier: "chatHistory",
        name: "历史",
        role: "system",
        marker: true,
      },
      {
        identifier: "deep",
        name: "历史里的破限",
        role: "system",
        content: "DEEP",
        injection_position: 1,
        injection_depth: 1,
        injection_order: 0,
      },
      {
        identifier: "jailbreak",
        name: "越狱",
        role: "system",
        content: "PHI {{user}} / {{persona}}",
      },
      { identifier: "vars", name: "变量", role: "system", content: "{{setvar::hp::3}}" },
      {
        identifier: "readvar",
        name: "读变量",
        role: "system",
        content: "HP={{getvar::hp}}",
      },
      { identifier: "off-entry", name: "关掉的条目", role: "system", content: "OFF" },
      {
        identifier: "order-off",
        name: "顺序里关掉",
        role: "system",
        content: "ORDER_OFF",
      },
      { identifier: "orphan", name: "没被顺序引用", role: "system", content: "ORPHAN" },
    ],
    prompt_order: [
      {
        character_id: 1,
        order: [
          { identifier: "main", enabled: true },
          { identifier: "style", enabled: true },
          { identifier: "personaDescription", enabled: true },
          { identifier: "chatHistory", enabled: true },
          { identifier: "deep", enabled: true },
          { identifier: "jailbreak", enabled: true },
          { identifier: "vars", enabled: true },
          { identifier: "readvar", enabled: true },
          { identifier: "off-entry", enabled: true },
          { identifier: "order-off", enabled: false },
          // orphan 不在这里 → 必须不出现
        ],
      },
    ],
    ...extra,
  };
}

const pack: WorldInfoPack = {
  worldBookBefore: [{ id: "lore", name: "", content: "舞台：古镇夜雨" }],
  history: [
    { role: "assistant", content: "门开了。" },
    { role: "user", content: "我推门。" },
  ],
  worldBookAfter: [{ id: "state", name: "", content: "HP 3" }],
  turn: "我抬头",
  postTurn: [],
};

function build(raw: RawPreset, opts: { charName?: string } = {}): ChatMessage[] {
  const report = importSillyTavernPreset(raw);
  return assemblePlayWorkerMessages({
    systemPrompt: "",
    preset: report.preset,
    pack,
    persona: { name: "林晚", description: "二十岁，缄默" },
    charName: opts.charName ?? "长夜行",
  });
}

describe("预设保真度：结构", () => {
  it("按 prompt_order 顺序、按条目 role 发消息（squash=none 时原样）", () => {
    const messages = build(richPreset());
    expect(messages.map((m) => [m.role, m.content])).toEqual([
      ["system", "MAIN 长夜行"],
      ["system", "文风：克制"],
      ["system", "二十岁，缄默"],
      ["system", "舞台：古镇夜雨"],
      ["assistant", "门开了。"],
      ["system", "DEEP"], // depth=1 → 插在历史倒数第一条之前
      ["user", "我推门。"],
      ["system", "HP 3"],
      ["user", "我抬头"],
      ["system", "PHI 林晚 / 二十岁，缄默"],
      ["system", "HP=3"],
      ["system", "OFF"],
    ]);
  });

  it("order.enabled=false 才不发；prompt.enabled=false 照发（跟酒馆一致）", () => {
    const raw = richPreset();
    const prompts = raw.prompts as Array<Record<string, unknown>>;
    prompts.find((p) => p.identifier === "off-entry")!.enabled = false;
    const text = build(raw)
      .map((m) => m.content)
      .join("\n");
    expect(text).toContain("OFF");
    expect(text).not.toContain("ORDER_OFF");
  });

  it("prompt_order 没引用的条目一律不发", () => {
    const text = build(richPreset())
      .map((m) => m.content)
      .join("\n");
    expect(text).not.toContain("ORPHAN");
  });

  it("宏在装配期展开，跨条目共享一份变量表", () => {
    const text = build(richPreset())
      .map((m) => m.content)
      .join("\n");
    expect(text).toContain("MAIN 长夜行");
    expect(text).toContain("PHI 林晚 / 二十岁，缄默");
    // setvar 在 vars 条目、getvar 在后面的 readvar 条目
    expect(text).toContain("HP=3");
  });

  it("历史洞展开成真多轮，不是一段文本", () => {
    const messages = build(richPreset());
    // 两轮各自一条 message，且没有哪一条把两轮揉在一起
    expect(messages.some((m) => m.role === "assistant" && m.content === "门开了。"))
      .toBe(true);
    expect(messages.some((m) => m.role === "user" && m.content === "我推门。"))
      .toBe(true);
    expect(messages.some((m) => m.content.includes("门开了") && m.content.includes("我推门")))
      .toBe(false);
    // 变成一条 system 文本也不算：历史里的轮次必须保留 user / assistant
    const assistantTurns = messages.filter((m) => m.role === "assistant");
    expect(assistantTurns.length).toBeGreaterThan(0);
  });

  it("injection_position=1 按 depth 从历史底部插", () => {
    const messages = build(richPreset());
    const index = messages.findIndex((m) => m.content === "DEEP");
    const histStart = messages.findIndex((m) => m.content === "门开了。");
    const histEnd = messages.findIndex((m) => m.content === "我推门。");
    expect(index).toBeGreaterThan(histStart);
    expect(index).toBeLessThan(histEnd);
  });

  it("depth=0 贴在历史末尾（本轮输入之前）", () => {
    const raw = richPreset();
    const prompts = raw.prompts as Array<Record<string, unknown>>;
    prompts.find((p) => p.identifier === "deep")!.injection_depth = 0;
    const messages = build(raw);
    const order = messages.map((m) => m.content);
    expect(order.indexOf("DEEP")).toBe(order.indexOf("我推门。") + 1);
    expect(order.indexOf("我抬头")).toBeGreaterThan(order.indexOf("DEEP"));
  });
});

describe("预设保真度：squash 与生成参数", () => {
  it("读 squash_system_messages：bool / 枚举 / 缺失", () => {
    expect(readSquashMode(true)).toBe("system");
    expect(readSquashMode(false)).toBe("none");
    expect(readSquashMode("strict")).toBe("strict");
    expect(readSquashMode(2)).toBe("semi");
    expect(readSquashMode(undefined)).toBeUndefined();
    expect(readSquashMode("weird")).toBeUndefined();
  });

  it("预设写了 squash 就跟预设；没写落回缺省 strict", () => {
    const withNone = importSillyTavernPreset(richPreset()).preset;
    expect(withNone.messagePolicy?.squash).toBe("none");
    expect(resolveSquashForPreset(withNone, "follow-preset")).toBe("none");

    const withTrue = importSillyTavernPreset(
      richPreset({ squash_system_messages: true }),
    ).preset;
    expect(resolveSquashForPreset(withTrue, "follow-preset")).toBe("system");

    const rawDefault = richPreset();
    delete rawDefault.squash_system_messages;
    const byDefault = importSillyTavernPreset(rawDefault).preset;
    expect(byDefault.messagePolicy).toBeUndefined();
    expect(resolveSquashForPreset(byDefault, "follow-preset")).toBe("strict");

    // 设置页显式选的优先于预设
    expect(resolveSquashForPreset(withTrue, "semi")).toBe("semi");
  });

  it("生成参数从预设进请求", async () => {
    const seen: Array<Record<string, unknown>> = [];
    const provider: LlmProvider = {
      async complete(_messages, options): Promise<CompleteResult> {
        seen.push((options?.generation ?? {}) as Record<string, unknown>);
        return { content: "ok", model: "m" };
      },
      async completeWithTools() {
        return { content: "ok", toolCalls: [], model: "m" };
      },
    };
    const preset = importSillyTavernPreset(richPreset()).preset;
    await wrapLlmForSession(provider, undefined, () => preset).complete([
      { role: "user", content: "TASK" },
    ]);
    expect(seen[0]).toMatchObject({ temperature: 0.77, topP: 0.9, maxOutputTokens: 777 });
  });
});