import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import { after, before, test } from "node:test";

import React, { createElement } from "react";
import { renderToStaticMarkup } from "react-dom/server";
import { createServer } from "vite";

let server;
let DEVICE_PLUGIN_SELECTED_MODEL_STORAGE_KEY;
let DevicePluginHostProvider;
let commitPersistedDeviceModelId;
let restorePersistedDeviceModelId;

const hostSourceUrl = new URL(
  "../src/core/device-plugins/DevicePluginHost.tsx",
  import.meta.url,
);

before(async () => {
  server = await createServer({
    appType: "custom",
    logLevel: "silent",
    server: { middlewareMode: true },
  });
  ({
    DEVICE_PLUGIN_SELECTED_MODEL_STORAGE_KEY,
    DevicePluginHostProvider,
    commitPersistedDeviceModelId,
    restorePersistedDeviceModelId,
  } = await server.ssrLoadModule("/src/core/device-plugins/DevicePluginHost.tsx"));
});

after(async () => {
  await server?.close();
});

function memoryStorage(seed = {}) {
  const values = new Map(Object.entries(seed));
  const calls = [];
  return {
    calls,
    getItem(key) {
      calls.push(["get", key]);
      return values.get(key) ?? null;
    },
    setItem(key, value) {
      calls.push(["set", key, value]);
      values.set(key, value);
    },
    removeItem(key) {
      calls.push(["remove", key]);
      values.delete(key);
    },
    value(key) {
      return values.get(key) ?? null;
    },
  };
}

function registryWith(...modelIds) {
  const registered = new Set(modelIds);
  return {
    resolveModel(modelId) {
      return registered.has(modelId) ? { model: { id: modelId } } : null;
    },
  };
}

function fakePlugin(modelId) {
  function RuntimeProvider({ activeModel, children }) {
    return createElement(
      "div",
      { "data-active-model": activeModel?.id ?? "" },
      children,
    );
  }
  function ConnectionView() {
    return null;
  }
  return {
    manifest: {
      apiVersion: "missioncore.nodedc/v1alpha1",
      kind: "DevicePlugin",
      metadata: {
        id: "test.device.plugin",
        version: "1.0.0",
        displayName: "Test device",
      },
      spec: {
        hostApiRange: "v1alpha1",
        runtime: {
          backendEntrypoint: "test.device:plugin",
          isolation: "transitional-in-process",
        },
        permissions: [],
        actions: [{ id: "state.read", mutating: false, secretFields: [] }],
        models: [{
          id: modelId,
          vendor: "Test",
          displayName: "Test model",
          category: "test",
          description: "test",
          verified: true,
          capabilities: [],
          ui: {
            slot: "device.connection",
            componentKey: "test.connection",
          },
        }],
      },
    },
    RuntimeProvider,
    connectionViews: { "test.connection": ConnectionView },
  };
}

test("persisted model restore admits only an id in the current plugin registry", () => {
  const key = DEVICE_PLUGIN_SELECTED_MODEL_STORAGE_KEY;
  const registry = registryWith("xgrids.lixelkity-k1");
  const valid = memoryStorage({ [key]: "  xgrids.lixelkity-k1  " });

  assert.equal(
    restorePersistedDeviceModelId(registry, valid),
    "xgrids.lixelkity-k1",
  );
  assert.equal(valid.calls.some(([operation]) => operation === "remove"), false);

  for (const staleValue of ["removed.model", "   "]) {
    const stale = memoryStorage({ [key]: staleValue });
    assert.equal(restorePersistedDeviceModelId(registry, stale), null);
    assert.equal(stale.value(key), null, "a stale model id must be cleared");
  }
  assert.equal(restorePersistedDeviceModelId(registry, null), null);
});

test("fresh provider mount immediately activates the registry-validated persisted model", () => {
  const modelId = "test.model.one";
  const storage = memoryStorage({
    [DEVICE_PLUGIN_SELECTED_MODEL_STORAGE_KEY]: modelId,
  });
  const previousWindow = globalThis.window;
  globalThis.window = { localStorage: storage };
  try {
    const markup = renderToStaticMarkup(createElement(
      DevicePluginHostProvider,
      { plugins: [fakePlugin(modelId)] },
      createElement("span", null, "runtime child"),
    ));
    assert.match(markup, /data-active-model="test\.model\.one"/);
  } finally {
    if (previousWindow === undefined) delete globalThis.window;
    else globalThis.window = previousWindow;
  }
});

test("successful selection commits and explicit clear removes the same durable key", () => {
  const storage = memoryStorage();
  commitPersistedDeviceModelId("xgrids.lixelkity-k1", storage);
  assert.equal(
    storage.value(DEVICE_PLUGIN_SELECTED_MODEL_STORAGE_KEY),
    "xgrids.lixelkity-k1",
  );

  commitPersistedDeviceModelId(null, storage);
  assert.equal(storage.value(DEVICE_PLUGIN_SELECTED_MODEL_STORAGE_KEY), null);
  assert.deepEqual(
    storage.calls.slice(-1)[0],
    ["remove", DEVICE_PLUGIN_SELECTED_MODEL_STORAGE_KEY],
  );
});

test("unavailable browser storage fails closed without blocking host state", () => {
  const denied = {
    getItem() {
      throw new Error("storage denied");
    },
    setItem() {
      throw new Error("storage denied");
    },
    removeItem() {
      throw new Error("storage denied");
    },
  };
  assert.equal(
    restorePersistedDeviceModelId(registryWith("xgrids.lixelkity-k1"), denied),
    null,
  );
  assert.doesNotThrow(() =>
    commitPersistedDeviceModelId("xgrids.lixelkity-k1", denied)
  );
  assert.doesNotThrow(() => commitPersistedDeviceModelId(null, denied));
});

test("host writes persistence only after plugin deactivation succeeds", () => {
  const source = readFileSync(hostSourceUrl, "utf8");
  const failedDeactivation = source.indexOf("if (!(await deactivate()))");
  const admittedState = source.indexOf("setSelectedModelId(nextModelId);");
  const durableCommit = source.indexOf(
    "commitPersistedDeviceModelId(nextModelId, selectionStorage);",
    admittedState,
  );

  assert.ok(failedDeactivation >= 0);
  assert.ok(
    failedDeactivation < admittedState && admittedState < durableCommit,
    "failed deactivation branches must return before in-memory and durable commit",
  );
  assert.match(
    source,
    /if \(nextModelId === selectedModelId\) \{[\s\S]*?commitPersistedDeviceModelId\(nextModelId, selectionStorage\);[\s\S]*?return true;/,
    "explicit clear must remove stale persistence even from an already-empty host",
  );
  assert.match(
    source,
    /useState<string \| null>\(\(\) =>\s*restorePersistedDeviceModelId\(registry, selectionStorage\)/,
    "a fresh provider mount must restore before runtime providers receive activeModel",
  );
});