import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { mount, flushPromises, enableAutoUnmount, type VueWrapper } from "@vue/test-utils";
import ViewUIPlus from "view-ui-plus";
import { nextTick } from "vue";

import FlowAssignEmbed from "@/components/FlowAssignEmbed.vue";

/**
 * FL 侧选人 iframe 宿主的协议测试（自动化测试宿主，不是产品入口）。
 * 覆盖：地址构造（单 hash）、四道校验、监听器生命周期、取消保留旧选择、确认后 B 替换 A。
 */

enableAutoUnmount(afterEach);

const PROTO = "flow";
const VERSION = 1;
const APP_ORIGIN = window.location.origin;

function baseData(over: Record<string, unknown> = {}) {
    return {
        proto: PROTO,
        v: VERSION,
        type: "assign-confirmed",
        contextId: "",
        flowGuid: "g-embed",
        defVersion: 3,
        assigns: [{ nodeId: "u2", userIds: [101] }],
        ...over,
    };
}

/** view-ui-plus Modal 默认把内容 teleport 到 body，组件子树里查不到——按真实 DOM 取 */
function frameEl(): HTMLIFrameElement | null {
    return document.querySelector("iframe") as HTMLIFrameElement | null;
}

/** 父页收到消息的唯一入口：直接派发 MessageEvent，绕开真实 iframe 加载 */
function post(wrapper: VueWrapper, data: unknown, opts: { origin?: string; source?: unknown } = {}) {
    const frame = frameEl() as HTMLIFrameElement;
    const ev = new MessageEvent("message", {
        origin: opts.origin ?? APP_ORIGIN,
        source: (opts.source ?? frame.contentWindow) as Window | null,
        data,
    });
    window.dispatchEvent(ev);
    return nextTick();
}

function mountHost(props: Record<string, unknown> = {}) {
    return mount(FlowAssignEmbed, {
        props: { flowGuid: "g-embed", ...props },
        global: { plugins: [ViewUIPlus] },
        attachTo: document.body,
    });
}

/** 开框后 jsdom 仍不会真正加载子文档：给 iframe 挂一个显式窗口桩，父侧按它核 event.source */
async function openHost(wrapper: VueWrapper) {
    (wrapper.vm as any).open();
    await nextTick();
    await flushPromises();
    const frame = frameEl() as HTMLIFrameElement;
    Object.defineProperty(frame, "contentWindow", { value: { __frame: true }, configurable: true });
}

beforeEach(() => {
    document.body.innerHTML = "";
});

describe("FlowAssignEmbed 地址与会话", () => {
    it("open 生成单 hash 的 iframe 地址，带 flowGuid 与本次 contextId", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const src = (frameEl() as HTMLIFrameElement).getAttribute("src") || "";
        expect(src.split("#").length - 1).toBe(1);
        expect(src).toContain(`${APP_ORIGIN}/#/assign-preview?`);
        expect(src).toContain("flowGuid=g-embed");
        expect(src).toContain("contextId=");
        expect((wrapper.vm as any).contextId).toBeTruthy();
    });

    it("缺少 flowGuid 时不开框、不监听", async () => {
        const addSpy = vi.spyOn(window, "addEventListener");
        const wrapper = mountHost({ flowGuid: "" });
        (wrapper.vm as any).open();
        await nextTick();
        expect(frameEl()).toBeNull();
        expect(addSpy.mock.calls.filter((c) => c[0] === "message").length).toBe(0);
        addSpy.mockRestore();
    });
});

describe("FlowAssignEmbed 消息校验", () => {
    it("协议相符的确认消息：回传最终选择与版本锚", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid = (wrapper.vm as any).contextId;
        await post(wrapper, baseData({ contextId: cid }));
        const events = wrapper.emitted("confirmed");
        expect(events).toHaveLength(1);
        expect((events[0][0] as any).assigns).toEqual([{ nodeId: "u2", userIds: [101] }]);
        expect((events[0][0] as any).defVersion).toBe(3);
        expect((events[0][0] as any).flowGuid).toBe("g-embed");
    });

    it("异源、异窗口、异 contextId、畸形信封一律丢弃，不影响宿主", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid = (wrapper.vm as any).contextId;
        const fakeOtherWindow = { __other: true };

        await post(wrapper, baseData({ contextId: cid }), { origin: "https://evil.example.com" });
        await post(wrapper, baseData({ contextId: cid }), { source: fakeOtherWindow });
        await post(wrapper, baseData({ contextId: "stale-from-prev-session" }));
        await post(wrapper, { proto: "fc", v: VERSION, type: "assign-confirmed", contextId: cid });
        await post(wrapper, { proto: PROTO, v: 99, type: "assign-confirmed", contextId: cid });
        await post(wrapper, { proto: PROTO, v: VERSION, type: "not-ours", contextId: cid });
        await post(wrapper, "plain-string-from-page-script");

        expect(wrapper.emitted("confirmed")).toBeUndefined();
        expect(wrapper.emitted("cancelled")).toBeUndefined();
    });

    it("确认消息缺 assigns 时形状校验拦下（不落成空选择）", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid = (wrapper.vm as any).contextId;
        await post(wrapper, baseData({ contextId: cid, assigns: undefined }));
        expect(wrapper.emitted("confirmed")).toBeUndefined();
    });
});

describe("FlowAssignEmbed 生命周期与选择语义", () => {
    it("取消：只通知宿主，不产生确认，旧选择不被覆盖", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid = (wrapper.vm as any).contextId;
        await post(wrapper, baseData({ contextId: cid, type: "assign-cancelled" }));
        expect(wrapper.emitted("cancelled")).toHaveLength(1);
        expect(wrapper.emitted("confirmed")).toBeUndefined();
    });

    it("确认后同一会话的迟到消息不再触发（监听器已摘）", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid = (wrapper.vm as any).contextId;
        await post(wrapper, baseData({ contextId: cid }));
        await post(wrapper, baseData({ contextId: cid, assigns: [{ nodeId: "u2", userIds: [777] }] }));
        const events = wrapper.emitted("confirmed");
        expect(events).toHaveLength(1);
        expect((events[0][0] as any).assigns[0].userIds).toEqual([101]);
    });

    it("宿主自己关框（未答复）：按取消处理并摘监听", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid = (wrapper.vm as any).contextId;
        (wrapper.vm as any).close();
        await nextTick();
        expect(wrapper.emitted("cancelled")).toHaveLength(1);
        await post(wrapper, baseData({ contextId: cid }));
        expect(wrapper.emitted("confirmed")).toBeUndefined();
    });

    it("重开换新 contextId：旧会话残消息不影响新一轮，确认以最近一次为准（B 替换 A）", async () => {
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid1 = (wrapper.vm as any).contextId;
        await post(wrapper, baseData({ contextId: cid1, assigns: [{ nodeId: "u2", userIds: [101] }] }));
        expect((wrapper.emitted("confirmed")![0][0] as any).assigns[0].userIds).toEqual([101]);

        // 宿主把 A 记在内存里，重开选 B
        await openHost(wrapper);
        const cid2 = (wrapper.vm as any).contextId;
        expect(cid2).not.toEqual(cid1);

        // 上一轮残帧补发一条：按 context 失效
        await post(wrapper, baseData({ contextId: cid1, assigns: [{ nodeId: "u2", userIds: [999] }] }));
        expect(wrapper.emitted("confirmed")).toHaveLength(1);

        await post(wrapper, baseData({ contextId: cid2, assigns: [{ nodeId: "u2", userIds: [102, 103] }] }));
        const events = wrapper.emitted("confirmed");
        expect(events).toHaveLength(2);
        expect((events[1][0] as any).assigns[0].userIds).toEqual([102, 103]);
    });

    it("卸载后监听器摘掉，后续消息不再回传", async () => {
        const removeSpy = vi.spyOn(window, "removeEventListener");
        const wrapper = mountHost();
        await openHost(wrapper);
        const cid = (wrapper.vm as any).contextId;
        const frame = frameEl() as HTMLIFrameElement;
        wrapper.unmount();
        expect(removeSpy.mock.calls.filter((c) => c[0] === "message").length).toBeGreaterThan(0);
        window.dispatchEvent(new MessageEvent("message", {
            origin: APP_ORIGIN,
            source: frame.contentWindow as Window,
            data: baseData({ contextId: cid }),
        }));
        await flushPromises();
        expect(wrapper.emitted("confirmed")).toBeUndefined();
        removeSpy.mockRestore();
    });
});