import type { AgentRunEvent } from "@umt/contracts";
import { createElement } from "react";
import { renderToStaticMarkup } from "react-dom/server";
import { describe, expect, it } from "vitest";
import { followBehavior } from "~/components/agentui/message-scroller.tsx";
import {
  agentListHref,
  agentRunHref,
  DRAFT_DRAWER_GOAL,
  DRAFT_PAGE_GOAL,
  readDraft,
  revealScrollTop,
  runDraftKey,
  writeDraft,
} from "./agent-nav.ts";
import { CompactPager } from "./agent-session-list.tsx";
import {
  agentReturnPath,
  clearAgentContext,
  isAgentPage,
  noteAgentReturnPath,
  openAgentDrawer,
  outletKey,
  setAgentDrawerOpen,
  showAgentRunInDrawer,
  syncAgentContextToPath,
  toggleAction,
  useAgentDrawer,
} from "./agent-store.ts";
import { cachedRunEvents, cacheRunEvents } from "./use-agent-stream.ts";

// 智能体页面切换的状态逻辑:整页重挂载 key、链接、草稿、滚动策略、快捷键在智能体页面的行为、路由上下文。

describe("主内容区重挂载 key", () => {
  it("列表页与各会话页共用一个 key,切换会话不重挂载", () => {
    expect(outletKey("/console/agent")).toBe("/console/agent");
    expect(outletKey("/console/agent/0b1c")).toBe("/console/agent");
    expect(outletKey("/console/agent/9f2e")).toBe(outletKey("/console/agent/0b1c"));
  });
  it("其它页面仍按路径重挂载", () => {
    expect(outletKey("/console/library")).toBe("/console/library");
    expect(outletKey("/console/agents-x")).toBe("/console/agents-x");
    expect(isAgentPage("/console/agentx")).toBe(false);
  });
});

describe("链接", () => {
  it("会话页、列表页链接保留演示开关;列表不再分栏,不带 tab", () => {
    expect(agentRunHref("r1")).toBe("/console/agent/r1");
    expect(agentRunHref("r1", true)).toBe("/console/agent/r1?mock=1");
    expect(agentListHref()).toBe("/console/agent");
    expect(agentListHref(true)).toBe("/console/agent?mock=1");
  });
});

describe("当前会话滚进可见区", () => {
  const vp = { scrollTop: 200, height: 300 };
  it("已经完整可见不滚", () => {
    expect(revealScrollTop({ top: 250, height: 40 }, vp)).toBeNull();
  });
  it("在上方:滚到顶边对齐;在下方:滚到底边刚好露出", () => {
    expect(revealScrollTop({ top: 120, height: 40 }, vp)).toBe(120);
    expect(revealScrollTop({ top: 600, height: 40 }, vp)).toBe(340);
  });
});

describe("会话列表分页(窄列表一行)", () => {
  const pager = (p: Partial<Parameters<typeof CompactPager>[0]>) =>
    renderToStaticMarkup(
      createElement(CompactPager, { page: 1, pageSize: 20, total: 0, onPageChange: () => {}, ...p }),
    );
  it("只有一页不显示", () => {
    expect(pager({ total: 12 })).toBe("");
  });
  it("多页:总数 + 当前页 / 页数,没有每页条数选择", () => {
    const html = pager({ total: 48, page: 2 });
    expect(html).toContain("共 48 条");
    expect(html).toContain("2 / 3");
    expect(html).not.toContain("每页");
  });
  it("还能往后加载时标出已加载条数和「+」", () => {
    const html = pager({ total: 20, hasMore: true });
    expect(html).toContain("已加载 20 条");
    expect(html).toContain("1 / 1+");
  });
});

describe("输入草稿", () => {
  it("按会话分开记,切走再回来还在,不串到别的会话", () => {
    writeDraft(runDraftKey("a"), "A 的草稿");
    writeDraft(runDraftKey("b"), "B 的草稿");
    expect(readDraft(runDraftKey("a"))).toBe("A 的草稿");
    expect(readDraft(runDraftKey("b"))).toBe("B 的草稿");
    expect(readDraft(runDraftKey("c"))).toBe("");
  });
  it("清空(发送成功)后不再恢复;只有空白也算清空", () => {
    writeDraft(runDraftKey("a"), "");
    writeDraft(runDraftKey("b"), "  ");
    expect(readDraft(runDraftKey("a"))).toBe("");
    expect(readDraft(runDraftKey("b"))).toBe("");
  });
  it("列表页与抽屉的新对话输入框各记各的;没有键时不记", () => {
    writeDraft(DRAFT_PAGE_GOAL, "页面里写了一半");
    writeDraft(DRAFT_DRAWER_GOAL, "抽屉里写了一半");
    writeDraft(undefined, "不记");
    expect(readDraft(DRAFT_PAGE_GOAL)).toBe("页面里写了一半");
    expect(readDraft(DRAFT_DRAWER_GOAL)).toBe("抽屉里写了一半");
    expect(readDraft(undefined)).toBe("");
  });
});

describe("消息区滚动策略", () => {
  it("流式的小段增长平滑跟随", () => {
    expect(followBehavior({ gap: 48, viewport: 600, reduce: false })).toBe("smooth");
  });
  it("一次多出一屏以上(打开 / 切回会话铺开历史)直接跳到底", () => {
    expect(followBehavior({ gap: 1400, viewport: 600, reduce: false })).toBe("auto");
  });
  it("减少动态效果时一律直接跳", () => {
    expect(followBehavior({ gap: 48, viewport: 600, reduce: true })).toBe("auto");
  });
});

describe("切回看过的会话:事件缓存", () => {
  const ev = (seq: number) => ({ seq, at: "2026-10-06T00:00:00Z", type: "text_delta", delta: "x" }) as AgentRunEvent;
  it("记住最近读到的事件,切回时直接可用", () => {
    cacheRunEvents("live:a", [ev(0), ev(1)]);
    expect(cachedRunEvents("live:a").map((e) => e.seq)).toEqual([0, 1]);
    expect(cachedRunEvents("mock:a")).toEqual([]);
  });
  it("空列表不覆盖已有缓存;超过 30 条会话丢掉最早看的", () => {
    cacheRunEvents("live:a", []);
    expect(cachedRunEvents("live:a")).toHaveLength(2);
    for (let i = 0; i < 30; i++) cacheRunEvents(`live:n${i}`, [ev(i)]);
    expect(cachedRunEvents("live:a")).toEqual([]);
    expect(cachedRunEvents("live:n29")).toHaveLength(1);
  });
});

describe("Ctrl+J / 智能体入口在不同页面", () => {
  it("抽屉开着:收起", () => {
    expect(toggleAction({ open: true, runId: "r" }, "/console/library")).toBe("close");
    expect(toggleAction({ open: true, runId: null }, "/console/agent/r")).toBe("close");
  });
  it("已在智能体页面:聚焦页面输入框,不在抽屉里再开一份同一会话", () => {
    expect(toggleAction({ open: false, runId: "r" }, "/console/agent/r")).toBe("focus-page");
    expect(toggleAction({ open: false, runId: null }, "/console/agent")).toBe("focus-page");
  });
  it("其它页面:上次的会话还在就接着看,否则开新对话", () => {
    expect(toggleAction({ open: false, runId: "r" }, "/console/library")).toBe("restore");
    expect(toggleAction({ open: false, runId: null }, "/console/library")).toBe("open");
  });
});

describe("会话页「在侧边打开」回到之前的页面", () => {
  it("只记非智能体页面,带查询串", () => {
    noteAgentReturnPath("/console/library", "?filter=unidentified");
    noteAgentReturnPath("/console/agent");
    noteAgentReturnPath("/console/agent/r1", "?tab=auto");
    expect(agentReturnPath()).toBe("/console/library?filter=unidentified");
    noteAgentReturnPath("/console/sites");
    expect(agentReturnPath()).toBe("/console/sites");
  });
});

describe("抽屉开着时路由变化", () => {
  // useAgentDrawer 是 useSyncExternalStore,测试里直接读快照
  const snapshot = () => {
    let out: ReturnType<typeof useAgentDrawer> | null = null;
    const Probe = () => {
      out = useAgentDrawer();
      return null;
    };
    renderToStaticMarkup(createElement(Probe));
    return out as unknown as ReturnType<typeof useAgentDrawer>;
  };
  it("新对话的路由上下文跟着页面换", () => {
    openAgentDrawer({ label: "作品 aaaa", entityId: "aaaa", fromPath: true });
    syncAgentContextToPath("/console/sites/hdh");
    expect(snapshot().context).toMatchObject({ siteId: "hdh", fromPath: true });
    syncAgentContextToPath("/console/home");
    expect(snapshot().context).toBeNull();
  });
  it("下载详情页带上下载任务;下载计划页不算", () => {
    openAgentDrawer({ label: "作品 aaaa", entityId: "aaaa", fromPath: true });
    syncAgentContextToPath("/console/downloads/t1");
    expect(snapshot().context).toMatchObject({ downloadTaskId: "t1", fromPath: true });
    syncAgentContextToPath("/console/downloads/plans");
    expect(snapshot().context).toBeNull();
    setAgentDrawerOpen(false);
  });
  it("关上再打开:接着看同一个会话(没有最小化小窗)", () => {
    showAgentRunInDrawer("r9");
    setAgentDrawerOpen(false);
    expect(snapshot()).toMatchObject({ open: false, runId: "r9" });
    expect(toggleAction(snapshot(), "/console/library")).toBe("restore");
    setAgentDrawerOpen(true);
    expect(snapshot()).toMatchObject({ open: true, runId: "r9" });
    setAgentDrawerOpen(false);
  });
  it("页面按钮带的上下文、正在看的会话、抽屉关着时不动", () => {
    openAgentDrawer({ label: "作品：沙丘", entityId: "e1" });
    syncAgentContextToPath("/console/sites/hdh");
    expect(snapshot().context).toMatchObject({ entityId: "e1" });
    clearAgentContext();
    showAgentRunInDrawer("r1");
    syncAgentContextToPath("/console/sites/hdh");
    expect(snapshot().context).toBeNull();
    setAgentDrawerOpen(false);
  });
});