/**
 * Deterministic livestream mock: create/manage lives, live chat
 * read/write/moderation, playback sources, and a scripted state transition
 * hook for Auto Director tests.
 */
import type {
  ConnectorCapabilities,
  ConnectorConnection,
  LiveChatMessage,
  LiveStream,
  NormalizedIdentity,
  Page,
  StreamPlaybackSource,
} from "@tactical-media-broadcast-hub/core";
import {
  assertValidManifest,
  pageOf,
  type ConnectorManifest,
  type PlatformConnector,
} from "@tactical-media-broadcast-hub/connector-sdk";

const CAPABILITIES: ConnectorCapabilities = {
  livestreams: true,
  createLivestream: true,
  manageLivestream: true,
  livePlaybackSource: true,
  liveChatRead: true,
  liveChatWrite: true,
  liveChatModeration: true,
  livestreamAnalytics: true,
};

let seq = 0;
const nextId = (prefix: string): string => `${prefix}-${(seq += 1)}`;

interface MockLive extends LiveStream {
  chat: LiveChatMessage[];
}

export interface MockLivestreamState {
  lives: Map<string, MockLive>;
}

export function createMockLivestreamState(): MockLivestreamState {
  return { lives: new Map() };
}

export function createMockLivestreamConnector(
  state: MockLivestreamState = createMockLivestreamState(),
): PlatformConnector {
  const manifest: ConnectorManifest = {
    id: "mock-livestream",
    displayName: "Mock Livestream",
    capabilities: CAPABILITIES,
    connectionFields: [{ name: "apiToken", label: "API token", required: true, secret: true }],
  };

  return {
    manifest: () => {
      assertValidManifest(manifest);
      return manifest;
    },

    async authorize() {
      throw new Error("mock-livestream uses token auth in tests only");
    },

    async getIdentity(connection: ConnectorConnection): Promise<NormalizedIdentity> {
      return {
        provider: manifest.id,
        remoteId: connection.channelId,
        handle: "mock@live",
        displayName: "Mock Live Channel",
      };
    },

    async createLiveStream(
      _connection: ConnectorConnection,
      request: { channelId: string; title: string; permanent: boolean; saveReplay: boolean },
    ): Promise<LiveStream> {
      const remoteId = nextId("live");
      const live: MockLive = {
        id: remoteId,
        provider: manifest.id,
        connectionId: "pending",
        remoteId,
        title: request.title,
        state: "created",
        streamKeyRef: { kind: "credential-ref", id: nextId("keyref") },
        rtmpUrl: "rtmp://mock.local/live",
        playbackUrls: [`https://mock.local/hls/${remoteId}/master.m3u8`],
        chat: [],
      };
      state.lives.set(remoteId, live);
      return live;
    },

    async updateLiveStream(
      _connection: ConnectorConnection,
      request: { remoteId: string; title?: string },
    ): Promise<LiveStream> {
      const live = state.lives.get(request.remoteId);
      if (live === undefined) throw new Error(`no live ${request.remoteId}`);
      if (request.title !== undefined) live.title = request.title;
      return live;
    },

    async getLiveStreams(
      _connection: ConnectorConnection,
      request: { cursor?: string; limit: number },
    ): Promise<Page<LiveStream>> {
      const all = [...state.lives.values()];
      const start = request.cursor ? Number(request.cursor) : 0;
      const items = all.slice(start, start + request.limit);
      const next = start + request.limit;
      return next < all.length ? pageOf(items, String(next)) : pageOf(items);
    },

    async getStreamPlaybackSources(
      _connection: ConnectorConnection,
      request: { remoteId: string },
    ): Promise<StreamPlaybackSource[]> {
      const live = state.lives.get(request.remoteId);
      if (live === undefined) return [];
      return [
        {
          remoteId: live.remoteId,
          url: `https://mock.local/hls/${live.remoteId}/master.m3u8`,
          kind: "hls",
          protocol: "https",
        },
      ];
    },

    async getLiveChat(
      _connection: ConnectorConnection,
      request: { liveRemoteId: string; cursor?: string; limit: number },
    ): Promise<Page<LiveChatMessage>> {
      const live = state.lives.get(request.liveRemoteId);
      if (live === undefined) return pageOf([]);
      const start = request.cursor ? Number(request.cursor) : 0;
      const items = live.chat.slice(start, start + request.limit);
      const next = start + request.limit;
      return next < live.chat.length ? pageOf(items, String(next)) : pageOf(items);
    },

    async sendLiveChatMessage(
      _connection: ConnectorConnection,
      request: { liveRemoteId: string; text: string },
    ): Promise<LiveChatMessage> {
      const live = state.lives.get(request.liveRemoteId);
      if (live === undefined) throw new Error(`no live ${request.liveRemoteId}`);
      const message: LiveChatMessage = {
        id: nextId("msg"),
        provider: manifest.id,
        liveStreamId: live.remoteId,
        authorHandle: "mock@live",
        text: request.text,
        sentAt: new Date(),
        isModerated: false,
      };
      live.chat.push(message);
      return message;
    },

    async moderateLiveChat(
      _connection: ConnectorConnection,
      request: { liveRemoteId: string; messageRemoteId: string; action: "delete" | "timeout" | "ban" },
    ): Promise<void> {
      const live = state.lives.get(request.liveRemoteId);
      if (live === undefined) return;
      for (const message of live.chat) {
        if (message.id === request.messageRemoteId && request.action === "delete") {
          message.isModerated = true;
        }
      }
    },
  };
}

/** Test hook: scripted state transitions for Auto Director fixtures. */
export function transitionMockLive(
  state: MockLivestreamState,
  remoteId: string,
  to: LiveStream["state"],
): void {
  const live = state.lives.get(remoteId);
  if (live === undefined) throw new Error(`no live ${remoteId}`);
  live.state = to;
}