import { buildChatChannelDetailVM, type ChatMessageCandidate } from "@hivegrid/view-models";
import { describe, expect, it } from "vitest";

import { overlayChatChannelDetailRealtime } from "./chatRealtimeViewModel";

const message: ChatMessageCandidate = {
  id: "message_1",
  clientMessageId: "client_1",
  source: "websocket",
  deliveryState: "sent",
  failureReasonKey: null,
  author: {
    userId: "user_1",
    displayName: "Ada",
    avatar: { imageUrl: null, fallbackLabel: "A" },
    isCurrentUser: false,
  },
  bodyMarkdown: "Hallo",
  bodyFormat: "markdown",
  systemEvent: null,
  createdAtIso: "2026-07-15T08:00:00.000Z",
  updatedAtIso: "2026-07-15T08:00:00.000Z",
  editedAtIso: null,
  deletedAtIso: null,
  parentMessageId: null,
  mentions: [],
  reactions: [],
  thread: null,
  attachments: [],
  linkPreviews: [],
  readAggregate: { readCount: 0, recipientCount: 1, readerUserIds: [], readerLabels: [], labelKey: "chat.message.read.none" },
  pin: null,
  actions: { canReact: false, canReply: false, canEdit: false, canDelete: false, canPin: false, canMarkAsTask: false },
};

function readyVm() {
  return buildChatChannelDetailVM({
    header: {
      id: "chat_1",
      kind: "group",
      title: "Team",
      subtitle: null,
      avatar: { imageUrl: null, fallbackLabel: "T" },
      project: null,
      memberCount: 2,
      isPrivate: false,
      isArchived: false,
      isAuditMode: false,
      canManage: false,
      settingsHref: null,
      pinnedHref: null,
      searchHref: "/tenant/chat/chat_1/search",
    },
    messages: [],
    pinnedMessages: [],
    typingLabels: [],
    history: { olderCursor: null, hasOlder: false },
    composer: {
      disabledReasonKey: null,
      canSend: true,
      canAttachFiles: false,
      canRecordVoice: false,
      canMention: false,
      canMarkAsTask: false,
      draftStorageKey: "chat:draft",
      maxBodyLength: 8_000,
    },
    connection: { state: "connecting", reconnectAttempt: 0, retryAtIso: null },
  });
}

describe("overlayChatChannelDetailRealtime", () => {
  it("overlays transport state on a ready loader VM without replacing domain data", () => {
    const renderedMessage = buildChatChannelDetailVM({ ...readyVmInput(), messages: [message] });
    if (renderedMessage.status !== "ready") throw new Error("fixture must be ready");
    const vm = readyVm();
    const result = overlayChatChannelDetailRealtime(vm, {
      messages: renderedMessage.data.messages,
      messageGroups: renderedMessage.data.messageGroups,
      presence: [{ userId: "user_2", status: "online" }],
      typingLabels: ["Ada"],
      connection: { state: "reconnecting", reconnectAttempt: 2, retryAtIso: "2026-07-15T08:01:00.000Z" },
    });

    expect(result.status).toBe("ready");
    if (result.status !== "ready" || vm.status !== "ready") throw new Error("fixture must be ready");
    expect(result.data.header).toBe(vm.data.header);
    expect(result.data.messages).toEqual(renderedMessage.data.messages);
    expect(result.data.presence).toEqual([{ userId: "user_2", status: "online" }]);
    expect(result.data.typingLabels).toEqual(["Ada"]);
    expect(result.data.connection).toEqual({
      state: "reconnecting",
      stateLabelKey: "chat.connection.reconnecting",
      reconnectAttempt: 2,
      retryAtIso: "2026-07-15T08:01:00.000Z",
      canRetry: true,
    });
  });

  it("leaves non-ready loader states untouched", () => {
    const vm = { status: "loading" } as const;
    expect(
      overlayChatChannelDetailRealtime(vm, {
        messages: [],
        messageGroups: [],
        presence: [],
        typingLabels: [],
        connection: { state: "online", reconnectAttempt: 0, retryAtIso: null },
      })
    ).toBe(vm);
  });

  it("makes a terminally blocked connection read-only without hiding the draft", () => {
    const vm = readyVm();
    const result = overlayChatChannelDetailRealtime(vm, {
      messages: [],
      messageGroups: [],
      presence: [],
      typingLabels: [],
      connection: { state: "blocked", reconnectAttempt: 0, retryAtIso: null },
    });

    expect(result.status).toBe("ready");
    if (result.status !== "ready") return;
    expect(result.data.composer).toMatchObject({
      enabled: false,
      canSend: false,
      disabledReasonKey: "chat.composer.connectionBlocked",
    });
    expect(result.data.connection.canRetry).toBe(false);
  });
});

function readyVmInput(): Parameters<typeof buildChatChannelDetailVM>[0] {
  const vm = readyVm();
  if (vm.status !== "ready") throw new Error("fixture must be ready");
  return {
    header: {
      id: vm.data.header.id,
      kind: vm.data.header.kind,
      title: vm.data.header.title,
      subtitle: vm.data.header.subtitle,
      avatar: vm.data.header.avatar,
      project: vm.data.header.project,
      memberCount: vm.data.header.memberCount,
      isPrivate: vm.data.header.isPrivate,
      isArchived: vm.data.header.isArchived,
      isAuditMode: vm.data.header.isAuditMode,
      canManage: vm.data.header.canManage,
      settingsHref: vm.data.header.settingsHref,
      pinnedHref: vm.data.header.pinnedHref,
      searchHref: vm.data.header.searchHref,
    },
    messages: [],
    pinnedMessages: [],
    typingLabels: [],
    history: vm.data.history,
    composer: {
      disabledReasonKey: vm.data.composer.disabledReasonKey,
      canSend: vm.data.composer.canSend,
      canAttachFiles: vm.data.composer.canAttachFiles,
      canRecordVoice: vm.data.composer.canRecordVoice,
      canMention: vm.data.composer.canMention,
      canMarkAsTask: vm.data.composer.canMarkAsTask,
      draftStorageKey: vm.data.composer.draftStorageKey,
      maxBodyLength: vm.data.composer.maxBodyLength,
    },
    connection: {
      state: vm.data.connection.state,
      reconnectAttempt: vm.data.connection.reconnectAttempt,
      retryAtIso: vm.data.connection.retryAtIso,
    },
  };
}