import { ref } from "vue";
import apiClient, { getApiErrorMessage } from "@/api/client";
import type { DanmakuEvent, DanmakuResponse, SessionDanmakuResponse } from "@/types";

export function useDanmakuPlayer() {
  const danmakuEvents = ref<DanmakuEvent[]>([]);
  const loading = ref(false);
  const error = ref("");

  async function loadTaskDanmaku(taskId: string): Promise<boolean> {
    loading.value = true;
    error.value = "";

    try {
      const { data } = await apiClient.get<DanmakuResponse>(`/record-tasks/${taskId}/danmaku`);
      danmakuEvents.value = data.events;
      return data.events.length > 0;
    } catch (err) {
      if ((err as { response?: { status?: number } })?.response?.status === 404) {
        error.value = "该分片没有弹幕数据。";
      } else {
        error.value = getApiErrorMessage(err, "弹幕数据加载失败。");
      }
      danmakuEvents.value = [];
      return false;
    } finally {
      loading.value = false;
    }
  }

  async function loadSessionDanmaku(sessionId: string): Promise<boolean> {
    loading.value = true;
    error.value = "";

    try {
      const { data } = await apiClient.get<SessionDanmakuResponse>(`/record-sessions/${sessionId}/danmaku`);
      // Flatten all task events into a single list with session-level offsets
      const allEvents: DanmakuEvent[] = [];
      for (const task of data.tasks) {
        allEvents.push(...task.events);
      }
      // Sort by offset for proper playback order
      allEvents.sort((a, b) => a.offsetSeconds - b.offsetSeconds);
      danmakuEvents.value = allEvents;
      return allEvents.length > 0;
    } catch (err) {
      if ((err as { response?: { status?: number } })?.response?.status === 404) {
        error.value = "该场次没有弹幕数据。";
      } else {
        error.value = getApiErrorMessage(err, "弹幕数据加载失败。");
      }
      danmakuEvents.value = [];
      return false;
    } finally {
      loading.value = false;
    }
  }

  function clear(): void {
    danmakuEvents.value = [];
    error.value = "";
    loading.value = false;
  }

  return { danmakuEvents, loading, error, loadTaskDanmaku, loadSessionDanmaku, clear };
}