// @vitest-environment happy-dom
import { act } from "react";
import { beforeEach, describe, expect, it } from "vitest";
import { createSceneStage, type SceneStage } from "../../src/browser/scene.js";
import { rendererInputFor } from "../../src/browser/scene-request.js";
import { createMemoryMediaCache, createMemoryStore } from "../../src/browser/storage.js";
import {
  createDisplayController,
  type DisplayChannelStateView,
} from "../../src/display/controller.js";
import { createFakeHost } from "./support/fake-host.js";
import {
  createFixtureRenderer,
  createReadiness,
  type FixtureRendererCounters,
} from "./support/fixture-renderer.js";

/**
 * A provider's live React renderer, on a Signage slide.
 *
 * The renderer here is test-only and is built with the platform's own `defineModuleContribution`, so
 * what these prove is the real contract: Signage hands it identity, timing, and an opaque payload,
 * mounts it through the host, waits for it to say it is ready, updates it in place, and takes it
 * down deterministically — and never learns anything about what it draws.
 */

(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;

const SELECTION = {
  availableUntilMs: null,
  deadlineAtMs: 20_000,
  durationMs: 20_000,
  id: "sel-trivia",
  itemId: "question-1",
  itemRevision: "1",
  payload: { answer: "Bethlehem", question: "Where was Jesus born?", revealAfterMs: 2000 },
  presentation: null,
  providerId: "fixture.trivia",
  renderer: {
    contributionId: "fixture.trivia.slide",
    contributionVersion: "1.0.0",
    kind: "contribution" as const,
  },
  revision: 1,
  slotId: "slot-trivia",
  startedAtMs: 0,
  withdrawn: false,
};

const CONTEXT = {
  audienceKey: "default",
  localNowMs: 1_000_000,
  paused: false,
  remainingMs: null,
  serverNowMs: 5000,
};

async function settle(): Promise<void> {
  for (let index = 0; index < 10; index += 1) {
    await act(async () => {
      await new Promise((resolve) => setTimeout(resolve, 0));
    });
  }
}

describe("a provider's contributed renderer", () => {
  let root: HTMLElement;
  let counters: FixtureRendererCounters;
  let stage: SceneStage;

  function mountFixture(readiness?: ReturnType<typeof createReadiness>) {
    const fixture = createFixtureRenderer({ counters, ...(readiness ? { readiness } : {}) });
    return createSceneStage({
      crossfadeMs: 0,
      mountContribution: async ({ container, input }) =>
        (await fixture.definition.mount(container, {
          contributionId: fixture.definition.id,
          input: input as never,
        })) ?? {},
      root,
      setTimer: (handler) => {
        handler();
        return undefined;
      },
    });
  }

  beforeEach(() => {
    root = document.createElement("div");
    document.body.append(root);
    counters = { mounts: 0, unmounts: 0, updates: 0 };
  });

  it("is not shown until it says it is ready", async () => {
    const readiness = createReadiness();
    stage = mountFixture(readiness);

    const showing = stage.show({
      contributionId: "fixture.trivia.slide",
      input: rendererInputFor(SELECTION, CONTEXT),
      key: "sel-trivia:default",
      kind: "contribution",
    });
    await settle();

    // Mounted, rendering, and still invisible: the stage waits for the renderer's own promise.
    expect(counters.mounts).toBe(1);
    const layers = [...root.querySelectorAll(".signage-layer")] as HTMLElement[];
    expect(layers.map((layer) => layer.style.opacity)).toEqual(["0", "0"]);

    readiness.ready();
    await act(async () => {
      await showing;
    });
    expect(layers.filter((layer) => layer.style.opacity === "1")).toHaveLength(1);
  });

  it("runs its own multi-stage presentation inside one Signage slide", async () => {
    stage = mountFixture();

    await act(async () => {
      await stage.show({
        contributionId: "fixture.trivia.slide",
        input: rendererInputFor(SELECTION, CONTEXT),
        key: "sel-trivia:default",
        kind: "contribution",
      });
    });
    await settle();

    expect(root.querySelector("[data-testid='fixture-trivia-question']")?.textContent).toBe(
      "Where was Jesus born?",
    );
    // The answer has not been revealed yet: that is the renderer's own timing, inside one slot whose
    // deadline Signage set and the renderer cannot extend.
    expect(root.querySelector("[data-testid='fixture-trivia-answer']")).toBeNull();

    await act(async () => {
      await new Promise((resolve) => setTimeout(resolve, 2100));
    });

    expect(root.querySelector("[data-testid='fixture-trivia-answer']")?.textContent).toBe(
      "Bethlehem",
    );
    // Still one mount, one slide. Signage never learned that anything happened.
    expect(counters.mounts).toBe(1);
    expect(counters.updates).toBe(0);
  });

  it("computes its countdown from the clock anchor, not the device's clock", async () => {
    stage = mountFixture();

    await act(async () => {
      await stage.show({
        contributionId: "fixture.trivia.slide",
        input: rendererInputFor(SELECTION, {
          ...CONTEXT,
          // A television whose clock is a year out. The anchor is what makes this right.
          localNowMs: Date.now(),
          serverNowMs: 5000,
        }),
        key: "sel-trivia:default",
        kind: "contribution",
      });
    });
    await settle();

    // Deadline 20s, server now 5s: fifteen seconds left, whatever the device believes.
    expect(root.querySelector("[data-testid='fixture-trivia-remaining']")?.textContent).toBe("15s");
  });

  it("renders a different audience differently, from one logical selection", async () => {
    stage = mountFixture();

    await act(async () => {
      await stage.show({
        contributionId: "fixture.trivia.slide",
        input: rendererInputFor(SELECTION, { ...CONTEXT, audienceKey: "online" }),
        key: "sel-trivia:online",
        kind: "contribution",
      });
    });
    await settle();

    expect(root.querySelector("[data-testid='fixture-trivia-audience']")?.textContent).toBe(
      "online",
    );
  });

  it("takes new content in place, without remounting or restarting its stage", async () => {
    stage = mountFixture();
    await act(async () => {
      await stage.show({
        contributionId: "fixture.trivia.slide",
        input: rendererInputFor(SELECTION, CONTEXT),
        key: "sel-trivia:default",
        kind: "contribution",
      });
    });
    await settle();

    await act(async () => {
      await stage.show({
        contributionId: "fixture.trivia.slide",
        input: rendererInputFor(
          {
            ...SELECTION,
            payload: { answer: "Bethlehem", question: "Cancelled", revealAfterMs: 2000 },
            revision: 2,
          },
          CONTEXT,
        ),
        key: "sel-trivia:default",
        kind: "contribution",
      });
    });
    await settle();

    expect(root.querySelector("[data-testid='fixture-trivia-question']")?.textContent).toBe(
      "Cancelled",
    );
    expect(counters.mounts).toBe(1);
    expect(counters.updates).toBe(1);
    expect(counters.unmounts).toBe(0);
  });

  it("mounts and unmounts repeatedly without leaking", async () => {
    stage = mountFixture();

    for (let index = 0; index < 4; index += 1) {
      await act(async () => {
        await stage.show({
          contributionId: "fixture.trivia.slide",
          input: rendererInputFor({ ...SELECTION, id: `sel-${index}` }, CONTEXT),
          key: `sel-${index}:default`,
          kind: "contribution",
        });
      });
      await settle();
    }
    await act(async () => {
      await stage.destroy();
    });

    // Four mounts, four unmounts, and nothing left in the DOM.
    expect(counters.mounts).toBe(4);
    expect(counters.unmounts).toBe(4);
    expect(root.querySelector("[data-testid='fixture-trivia']")).toBeNull();
  });

  it("keeps working from cached state with no network at all", async () => {
    const store = createMemoryStore();
    const media = createMemoryMediaCache();
    const fixture = createFixtureRenderer({ counters });
    const host = createFakeHost({
      contributions: [
        { capability: "signage.slide-renderer", id: "fixture.trivia.slide", version: "1.0.0" },
      ],
      mount: async (options) => {
        const instance = await fixture.definition.mount(options.container, {
          contributionId: options.contributionId,
          input: options.input,
        });
        return {
          contributionId: options.contributionId,
          mounted: true,
          unmount: async () => {
            await instance?.unmount?.();
          },
          update: async (input) => {
            await instance?.update?.(input);
          },
          version: "1.0.0",
        };
      },
      permissions: [],
      routes: [],
    });
    const state: DisplayChannelStateView = {
      channel: { groupId: "group-1", id: "chan-1", key: "default" },
      crossfadeMs: 0,
      current: SELECTION,
      playback: {
        activeTimelineId: "timeline-1",
        blackout: false,
        currentSelectionId: SELECTION.id,
        currentSlotId: SELECTION.slotId,
        deadlineAtMs: 20_000,
        pendingTimelineId: null,
        remainingMs: 20_000,
        revision: 1,
        selectionRevision: 1,
        startedAtMs: 0,
        transport: "playing",
      },
      selections: [SELECTION],
      serverNowMs: 5000,
      staticHold: null,
      timeline: {
        eligibleFromMs: null,
        eligibleUntilMs: null,
        id: "timeline-1",
        revision: 1,
        slots: [
          {
            eligibleFromMs: null,
            eligibleUntilMs: null,
            enabled: true,
            estimatedDurationMs: 20_000,
            id: "slot-trivia",
            position: 0,
          },
        ],
      },
    };

    // One successful online state, persisted.
    const online = createDisplayController({
      context: host.context,
      decodeImage: () => Promise.resolve(),
      media,
      now: () => 1_000_000,
      root,
      setTimer: () => undefined,
      store,
      telemetry: false,
    });
    await act(async () => {
      await online.start();
      await online.apply(state);
    });
    await settle();
    await act(async () => {
      await online.stop();
    });

    // A fresh controller with the same local storage and no server at all.
    const offlineRoot = document.createElement("div");
    document.body.append(offlineRoot);
    const offline = createDisplayController({
      context: host.context,
      decodeImage: () => Promise.resolve(),
      media,
      now: () => 1_000_000,
      root: offlineRoot,
      setTimer: () => undefined,
      store,
      telemetry: false,
    });
    await act(async () => {
      await offline.start();
    });
    await settle();

    // The renderer is on screen, from its cached artifact and this display's cached payload — with
    // no request made and nothing invented.
    expect(offlineRoot.querySelector("[data-testid='fixture-trivia-question']")?.textContent).toBe(
      "Where was Jesus born?",
    );
    expect(host.requests).toEqual([]);
    expect(offline.diagnostics().offline).toBe(true);
    await act(async () => {
      await offline.stop();
    });
  });
});