import { beforeEach, describe, expect, it } from "vitest";
import { buildDisplayChannelState } from "../src/server/display/state.js";
import { SignageError } from "../src/server/errors.js";
import { ingestNativeImage } from "../src/server/images/service.js";
import {
  createPlaybackService,
  type SignagePlaybackService,
} from "../src/server/playback/service.js";
import { createNativeImageProvider } from "../src/server/providers/native-provider.js";
import {
  createProviderRegistry,
  type SignageProviderRegistry,
} from "../src/server/providers/registry.js";
import type { StoredChannel } from "../src/server/store/types.js";
import { addProviderSource, addSlot, createTimeline } from "../src/server/timelines/service.js";
import { createDisplaysCapability } from "../src/server/viewers/capability.js";
import {
  describeViewerHealth,
  openViewerSession,
  recordViewerHeartbeat,
  SIGNAGE_VIEWER_OFFLINE_AFTER_MS,
  updateViewerAssignment,
} from "../src/server/viewers/service.js";
import { SIGNAGE_NATIVE_PROVIDER_ID } from "../src/shared/native-images.js";
import { SIGNAGE_DEFAULT_SETTINGS } from "../src/shared/settings.js";
import { createFakeStorage, type FakeStorage } from "./support/fake-storage.js";
import { announcementsFixture, type FixtureProvider } from "./support/fixture-provider.js";
import { makeImage } from "./support/images.js";
import { createMemorySignageStore, type MemorySignageStore } from "./support/memory-store.js";

const START = Date.parse("2026-08-30T15:00:00.000Z");

async function expectSignageCode(promise: Promise<unknown>, code: string): Promise<SignageError> {
  try {
    await promise;
  } catch (error) {
    expect(error).toBeInstanceOf(SignageError);
    const signageError = error as SignageError;
    expect(signageError.code).toBe(code);
    return signageError;
  }
  throw new Error(`Expected ${code}, but the operation succeeded.`);
}

describe("viewers", () => {
  let store: MemorySignageStore;
  let registry: SignageProviderRegistry;
  let service: SignagePlaybackService;
  let announcements: FixtureProvider;
  let clock: number;
  let counter: number;

  const newId = () => {
    counter += 1;
    return `00000000-0000-4000-8000-${String(counter).padStart(12, "0")}`;
  };

  beforeEach(async () => {
    clock = START;
    counter = 0;
    store = createMemorySignageStore({ now: () => new Date(clock) });
    registry = createProviderRegistry({ now: () => new Date(clock), timeoutMs: 1000 });
    announcements = announcementsFixture();
    registry.capability.register(announcements.registration);
    registry.capability.register(
      createNativeImageProvider({ defaultDurationMs: 7000, now: () => new Date(clock), store })
        .registration,
    );
    service = createPlaybackService({
      newId,
      now: () => clock,
      registry,
      setTimer: () => undefined,
      settings: SIGNAGE_DEFAULT_SETTINGS,
      store,
    });
    await service.ensureDefaultGroup();
  });

  async function defaultChannel(): Promise<StoredChannel> {
    const groups = await store.listChannelGroups();
    const channel = groups[0]?.channels[0];
    if (!channel) {
      throw new Error("Expected a default channel.");
    }
    return channel;
  }

  it("registers a display on the default channel, and never lets it pick one", async () => {
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });

    const channel = await defaultChannel();
    expect(session.channel.id).toBe(channel.id);
    expect(session.channel.isDefault).toBe(true);
    // There is no input by which a display could have asked for another channel: `openViewerSession`
    // takes an identity and nothing else.
    expect(session.viewer.name).toBe("New display");
  });

  it("recognizes a returning display rather than creating a ghost", async () => {
    const first = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });
    await updateViewerAssignment({ name: "Lobby north", store, viewerId: first.viewer.id });

    clock += 60_000;
    const second = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });

    // Same screen, same row, same name. A television that reboots does not fill the roster.
    expect(second.viewer.id).toBe(first.viewer.id);
    expect(second.viewer.name).toBe("Lobby north");
    expect(store.viewers.size).toBe(1);
  });

  it("stores only the safe device identifier a paired principal carries", async () => {
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: "3f2c1a9e-1111-4222-8333-444455556666",
      newId,
      store,
      viewerKey: "kiosk-lobby-0002",
    });

    expect(session.viewer.deviceId).toBe("3f2c1a9e-1111-4222-8333-444455556666");
    // Nothing about pairing, and no credential of any kind, is anywhere in the record.
    const serialized = JSON.stringify(session.viewer);
    for (const forbidden of ["token", "secret", "credential", "password", "pairing"]) {
      expect(serialized.toLowerCase()).not.toContain(forbidden);
    }
  });

  it("refuses a viewer key that is not one Signage issued the shape of", async () => {
    for (const viewerKey of ["", "short", "has spaces in it", "x".repeat(200)]) {
      await expectSignageCode(
        openViewerSession({ at: new Date(clock), deviceId: null, newId, store, viewerKey }),
        "SIGNAGE_INVALID_REQUEST",
      );
    }
  });

  it("coalesces a steady display's heartbeats into almost no writes", async () => {
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });
    const before = store.viewerWrites.count;

    // Ten heartbeats over forty seconds, saying exactly the same thing each time.
    for (let index = 0; index < 10; index += 1) {
      clock += 4000;
      await recordViewerHeartbeat({
        at: new Date(clock),
        heartbeat: { cachedAssetCount: 0, offlineReady: false, reportedSelectionId: null },
        minimumWriteIntervalMs: SIGNAGE_DEFAULT_SETTINGS.viewerHeartbeatWriteMs,
        store,
        viewerId: session.viewer.id,
      });
    }

    // Forty seconds at a thirty-second floor is one write, not ten. A wall of televisions is a wall
    // of these, and writing every one would say nothing new very expensively.
    expect(store.viewerWrites.count - before).toBe(1);
  });

  it("writes immediately when a display says something an operator would notice", async () => {
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });
    const before = store.viewerWrites.count;

    clock += 1000;
    const changed = await recordViewerHeartbeat({
      at: new Date(clock),
      heartbeat: { reportedSelectionId: "sel-1" },
      minimumWriteIntervalMs: SIGNAGE_DEFAULT_SETTINGS.viewerHeartbeatWriteMs,
      store,
      viewerId: session.viewer.id,
    });
    clock += 1000;
    const failing = await recordViewerHeartbeat({
      at: new Date(clock),
      heartbeat: {
        error: { code: "SLIDE_DECODE_FAILED", detail: "one image could not be decoded" },
        reportedSelectionId: "sel-1",
      },
      minimumWriteIntervalMs: SIGNAGE_DEFAULT_SETTINGS.viewerHeartbeatWriteMs,
      store,
      viewerId: session.viewer.id,
    });

    expect(changed.written).toBe(true);
    expect(failing.written).toBe(true);
    expect(store.viewerWrites.count - before).toBe(2);
    expect(failing.viewer.lastError).toMatchObject({ code: "SLIDE_DECODE_FAILED" });
  });

  it("refuses an unbounded or malformed error report from a display", async () => {
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });

    await expectSignageCode(
      recordViewerHeartbeat({
        at: new Date(clock),
        heartbeat: { error: { code: "x".repeat(200) } },
        minimumWriteIntervalMs: 0,
        store,
        viewerId: session.viewer.id,
      }),
      "SIGNAGE_INVALID_REQUEST",
    );
    await expectSignageCode(
      recordViewerHeartbeat({
        at: new Date(clock),
        heartbeat: { error: { code: "OK", detail: "y".repeat(5000) } },
        minimumWriteIntervalMs: 0,
        store,
        viewerId: session.viewer.id,
      }),
      "SIGNAGE_INVALID_REQUEST",
    );
  });

  it("reports a display as offline once it stops checking in", async () => {
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });

    expect(describeViewerHealth(session.viewer, clock).online).toBe(true);
    expect(
      describeViewerHealth(session.viewer, clock + SIGNAGE_VIEWER_OFFLINE_AFTER_MS + 1).online,
    ).toBe(false);
  });

  it("moves a display between channels, and refuses a channel that does not exist", async () => {
    const groups = await store.listChannelGroups();
    const group = groups[0];
    if (!group) {
      throw new Error("Expected a group.");
    }
    const onlineChannelId = newId();
    await store.addChannel({
      groupId: group.group.id,
      id: onlineChannelId,
      isDefault: false,
      key: "online",
      name: "Online",
    });
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: null,
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });

    const moved = await updateViewerAssignment({
      channelId: onlineChannelId,
      store,
      viewerId: session.viewer.id,
    });
    expect(moved.channelId).toBe(onlineChannelId);

    await expectSignageCode(
      updateViewerAssignment({
        channelId: "11111111-1111-4111-8111-111111111111",
        store,
        viewerId: session.viewer.id,
      }),
      "SIGNAGE_NOT_FOUND",
    );
  });

  it("exposes a sanitized roster through the displays capability", async () => {
    const session = await openViewerSession({
      at: new Date(clock),
      deviceId: "3f2c1a9e-1111-4222-8333-444455556666",
      newId,
      store,
      viewerKey: "kiosk-lobby-0001",
    });
    const capability = createDisplaysCapability(
      () => store,
      () => new Date(clock),
    );

    const viewers = await capability.listViewers();
    const channels = await capability.listChannels();

    expect(viewers).toHaveLength(1);
    expect(viewers[0]).toMatchObject({ id: session.viewer.id, online: true });
    expect(channels[0]).toMatchObject({ isDefault: true, key: "default" });
    // A consuming module sees identity and health. It never sees a credential, an object key, a
    // delivery URL, or a provider payload.
    const serialized = JSON.stringify({ channels, viewers });
    for (const forbidden of ["token", "secret", "objectKey", "https://", "payload"]) {
      expect(serialized).not.toContain(forbidden);
    }
  });
});

describe("display channel state", () => {
  let store: MemorySignageStore;
  let storage: FakeStorage;
  let registry: SignageProviderRegistry;
  let service: SignagePlaybackService;
  let announcements: FixtureProvider;
  let clock: number;
  let counter: number;

  const newId = () => {
    counter += 1;
    return `00000000-0000-4000-8000-${String(counter).padStart(12, "0")}`;
  };

  beforeEach(async () => {
    clock = START;
    counter = 0;
    store = createMemorySignageStore({ now: () => new Date(clock) });
    storage = createFakeStorage({ now: () => new Date(clock) });
    registry = createProviderRegistry({ now: () => new Date(clock), timeoutMs: 1000 });
    announcements = announcementsFixture();
    registry.capability.register(announcements.registration);
    registry.capability.register(
      createNativeImageProvider({ defaultDurationMs: 7000, now: () => new Date(clock), store })
        .registration,
    );
    service = createPlaybackService({
      newId,
      now: () => clock,
      registry,
      setTimer: () => undefined,
      settings: SIGNAGE_DEFAULT_SETTINGS,
      store,
    });
    await service.ensureDefaultGroup();
  });

  async function channelsOf(): Promise<readonly StoredChannel[]> {
    const groups = await store.listChannelGroups();
    return groups[0]?.channels ?? [];
  }

  async function stateFor(channel: StoredChannel) {
    return buildDisplayChannelState({
      atMs: clock,
      channel,
      playback: await service.snapshot(channel.groupId),
      registry,
      settings: SIGNAGE_DEFAULT_SETTINGS,
      storage,
      store,
    });
  }

  it("carries the frame, the timeline's shape, and recent selections — and no object key", async () => {
    const groups = await store.listChannelGroups();
    const groupId = groups[0]?.group.id as string;
    let timeline = await createTimeline({ name: "Loop", newId, store });
    timeline = await addProviderSource({
      label: "Announcements",
      newId,
      providerId: "fixture.announcements",
      sourceId: "active-slides",
      store,
      timelineId: timeline.timeline.id,
    });
    const source = timeline.sources[0];
    if (!source) {
      throw new Error("Expected a source.");
    }
    await addSlot({
      newId,
      source: { sourceId: source.id },
      store,
      timelineId: timeline.timeline.id,
    });
    await addSlot({
      newId,
      source: { sourceId: source.id },
      store,
      timelineId: timeline.timeline.id,
    });
    await service.activate(groupId, timeline.timeline.id, "now");

    const [channel] = await channelsOf();
    if (!channel) {
      throw new Error("Expected a channel.");
    }
    const state = await stateFor(channel);

    expect(state.current?.itemId).toBe("welcome");
    expect(state.current?.renderer).toEqual({
      contributionId: "fixture.announcements.slide",
      contributionVersion: "1.0.0",
      kind: "contribution",
    });
    // The shape a disconnected display advances its own cursor over, with the same estimates the
    // server skips passes with.
    expect(state.timeline?.slots).toHaveLength(2);
    expect(state.timeline?.slots[0]?.estimatedDurationMs).toBe(5000);
    expect(state.selections.length).toBeGreaterThan(0);
    // A display is handed identity, timing, and payloads — never an object key.
    expect(JSON.stringify(state)).not.toContain("objectKey");
  });

  it("gives each channel its own audience's payload, from one logical selection", async () => {
    const groups = await store.listChannelGroups();
    const groupId = groups[0]?.group.id as string;
    await store.addChannel({
      groupId,
      id: newId(),
      isDefault: false,
      key: "online",
      name: "Online",
    });
    let timeline = await createTimeline({ name: "Loop", newId, store });
    timeline = await addProviderSource({
      label: "Announcements",
      newId,
      providerId: "fixture.announcements",
      sourceId: "active-slides",
      store,
      timelineId: timeline.timeline.id,
    });
    const source = timeline.sources[0];
    if (!source) {
      throw new Error("Expected a source.");
    }
    await addSlot({
      newId,
      source: { sourceId: source.id },
      store,
      timelineId: timeline.timeline.id,
    });
    await service.activate(groupId, timeline.timeline.id, "now");
    // Move to the announcement that has an audience-specific variant.
    clock += 5000;
    await service.reconcile(groupId, "timer");

    const channels = await channelsOf();
    const base = channels.find((channel) => channel.key === "default") as StoredChannel;
    const online = channels.find((channel) => channel.key === "online") as StoredChannel;
    const baseState = await stateFor(base);
    const onlineState = await stateFor(online);

    expect(baseState.current?.payload).toEqual({ headline: "Good morning" });
    expect(onlineState.current?.payload).toEqual({ headline: "Watching from home" });
    // One selection, one slot, one deadline — two renderings.
    expect(onlineState.current?.id).toBe(baseState.current?.id);
    expect(onlineState.current?.deadlineAtMs).toBe(baseState.current?.deadlineAtMs);
    expect(onlineState.playback.startedAtMs).toBe(baseState.playback.startedAtMs);
  });

  it("resolves a native image into a scene and fresh delivery URLs", async () => {
    const groups = await store.listChannelGroups();
    const groupId = groups[0]?.group.id as string;
    const ingested = await ingestNativeImage({
      bytes: await makeImage({ format: "png", height: 1080, width: 1080 }),
      displayName: "Square",
      expiresAt: null,
      filename: "square.png",
      storage,
      store,
    });
    let timeline = await createTimeline({ name: "Images", newId, store });
    await addSlot({
      newId,
      pinned: { itemId: ingested.image.id, providerId: SIGNAGE_NATIVE_PROVIDER_ID },
      presentation: { backgroundMode: "blurred", blurPixels: 24 },
      store,
      timelineId: timeline.timeline.id,
    });
    timeline = (await store.findTimeline(timeline.timeline.id)) as never;
    await service.activate(groupId, timeline.timeline.id, "now");

    const [channel] = await channelsOf();
    if (!channel) {
      throw new Error("Expected a channel.");
    }
    const state = await stateFor(channel);

    expect(state.current?.renderer).toEqual({ kind: "native-image" });
    // A square image is not 16:9, so it is shown whole on the background the slot asked for.
    expect(state.current?.scene).toMatchObject({
      backgroundImage: true,
      blurPixels: 24,
      fit: "contain",
      shadow: true,
    });
    expect(state.current?.media?.display.url).toContain("https://storage.invalid/");
    expect(state.current?.media?.display.expiresAtMs).toBeGreaterThan(clock);
    // The URL was minted for this response and is nowhere in the database.
    expect(JSON.stringify([...store.selections.values()])).not.toContain("https://");
  });

  it("shapes a static hold exactly like a selection, so a display has one renderer path", async () => {
    const groups = await store.listChannelGroups();
    const groupId = groups[0]?.group.id as string;
    const ingested = await ingestNativeImage({
      bytes: await makeImage({ format: "png", height: 1080, width: 1920 }),
      displayName: "Hold",
      expiresAt: null,
      filename: "hold.png",
      storage,
      store,
    });
    await service.setStaticHold(groupId, ingested.image.id);

    const [channel] = await channelsOf();
    if (!channel) {
      throw new Error("Expected a channel.");
    }
    const state = await stateFor(channel);

    expect(state.playback.transport).toBe("static");
    expect(state.staticHold?.renderer).toEqual({ kind: "native-image" });
    // A true 16:9 image fills the frame on its own: no blurred duplicate, no shadow.
    expect(state.staticHold?.scene).toMatchObject({
      backgroundImage: false,
      fit: "fill",
      shadow: false,
    });
  });

  it("keeps a display's state usable when storage is briefly unreachable", async () => {
    const groups = await store.listChannelGroups();
    const groupId = groups[0]?.group.id as string;
    const ingested = await ingestNativeImage({
      bytes: await makeImage({ format: "png", height: 1080, width: 1920 }),
      displayName: "Slide",
      expiresAt: null,
      filename: "slide.png",
      storage,
      store,
    });
    const timeline = await createTimeline({ name: "Images", newId, store });
    await addSlot({
      newId,
      pinned: { itemId: ingested.image.id, providerId: SIGNAGE_NATIVE_PROVIDER_ID },
      store,
      timelineId: timeline.timeline.id,
    });
    await service.activate(groupId, timeline.timeline.id, "now");

    const [channel] = await channelsOf();
    if (!channel) {
      throw new Error("Expected a channel.");
    }
    const broken = {
      ...storage,
      bucket: () => {
        throw new Error("storage is down");
      },
    };
    const state = await buildDisplayChannelState({
      atMs: clock,
      channel,
      playback: await service.snapshot(groupId),
      registry,
      settings: SIGNAGE_DEFAULT_SETTINGS,
      storage: broken as never,
      store,
    });

    // The frame's identity, timing, and scene all survive. Only the URLs are missing, which costs a
    // display that already cached the bytes nothing at all.
    expect(state.current?.itemId).toBe(ingested.image.id);
    expect(state.current?.scene).toBeDefined();
    expect(state.current?.media).toBeUndefined();
  });
});