import { Api } from "@jellyfin/sdk";
import {
  BaseItemDto,
  BaseItemPerson,
  MediaSourceInfo,
  PlaybackInfoResponse,
} from "@jellyfin/sdk/lib/generated-client/models";
import {
  getMediaInfoApi,
  getUserLibraryApi,
} from "@jellyfin/sdk/lib/utils/api";
import AsyncStorage from "@react-native-async-storage/async-storage";
import * as FileSystem from "expo-file-system";
import { useAtom } from "jotai";
import { useCallback, useRef, useState } from "react";
import { runningProcesses } from "./atoms/downloads";
import { iosProfile } from "./device-profiles";
import {
  FFmpegKit,
  FFmpegKitConfig,
  ReturnCode,
} from "ffmpeg-kit-react-native";
import { writeToLog } from "./log";

/**
 * Try to convert the downloaded file to a supported format on-device. Leveraging the capability of modern phones.
 *
 * ⚠️ This function does not work, and the app crashes when running it.
 */
// const convertAndReplaceVideo = async (id: string) => {
//   const input = FileSystem.documentDirectory + id;
//   const output = FileSystem.documentDirectory + id + "_tmp.mp4";

//   const command = `-i ${input} -c:v h264 -profile:v baseline -level 3.0 -pix_fmt yuv420p -c:a aac -b:a 128k -movflags +faststart ${output}`;
//   try {
//     const session = await FFmpegKit.execute(command);
//     const rc: ReturnCode = await session.getReturnCode();
//     if (ReturnCode.isSuccess(rc)) {
//       console.log("Conversion successful, replacing the original file");

//       await FileSystem.moveAsync({
//         from: output,
//         to: input,
//       });

//       console.log("Replacement successful");
//     } else {
//       console.log("Conversion failed");
//     }
//   } catch (error) {
//     console.error("Error during conversion", error);
//   }
// };

export const useDownloadMedia = (api: Api | null, userId?: string | null) => {
  const [isDownloading, setIsDownloading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [_, setProgress] = useAtom(runningProcesses);
  const downloadResumableRef = useRef<FileSystem.DownloadResumable | null>(
    null
  );

  const downloadMedia = useCallback(
    async (item: BaseItemDto | null) => {
      if (!item?.Id || !api || !userId) {
        setError("Invalid item or API");
        return false;
      }

      setIsDownloading(true);
      setError(null);
      setProgress({
        item,
        progress: 0,
      });

      const itemId = item.Id;

      try {
        const filename = `${itemId}`;
        const fileUri = `${FileSystem.documentDirectory}${filename}`;

        const url = `${api.basePath}/Items/${itemId}/File`;

        downloadResumableRef.current = FileSystem.createDownloadResumable(
          url,
          fileUri,
          {
            headers: {
              Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
            },
          },
          (downloadProgress) => {
            const currentProgress =
              downloadProgress.totalBytesWritten /
              downloadProgress.totalBytesExpectedToWrite;

            setProgress({
              item,
              progress: currentProgress * 100,
            });
          }
        );

        const res = await downloadResumableRef.current.downloadAsync();
        const uri = res?.uri;

        console.log("File downloaded to:", uri);

        const currentFiles: BaseItemDto[] = JSON.parse(
          (await AsyncStorage.getItem("downloaded_files")) ?? "[]"
        );

        const updatedFiles = [
          ...currentFiles.filter((file) => file.Id !== itemId),
          item,
        ];

        await AsyncStorage.setItem(
          "downloaded_files",
          JSON.stringify(updatedFiles)
        );

        setIsDownloading(false);
        setProgress(null);
        return true;
      } catch (error) {
        console.error("Error downloading media:", error);
        setError("Failed to download media");
        setIsDownloading(false);
        return false;
      }
    },
    [api, setProgress]
  );

  const cancelDownload = useCallback(async () => {
    if (downloadResumableRef.current) {
      try {
        await downloadResumableRef.current.pauseAsync();
        setIsDownloading(false);
        setError("Download cancelled");
        setProgress(null);
        downloadResumableRef.current = null;
      } catch (error) {
        console.error("Error cancelling download:", error);
        setError("Failed to cancel download");
      }
    }
  }, [setProgress]);

  return { downloadMedia, isDownloading, error, cancelDownload };
};

export const useRemuxHlsToMp4 = (url: string, item: BaseItemDto) => {
  const [_, setProgress] = useAtom(runningProcesses);

  if (!item.Id || !item.Name) {
    writeToLog("ERROR", "useRemuxHlsToMp4 ~ missing arguments");
    throw new Error("Item must have an Id and Name");
  }

  const output = `${FileSystem.documentDirectory}${item.Id}.mp4`;

  const command = `-y -fflags +genpts -i ${url} -c copy -bufsize 10M -max_muxing_queue_size 4096 ${output}`;

  const startRemuxing = useCallback(async () => {
    if (!item.Id || !item.Name) {
      writeToLog(
        "ERROR",
        "useRemuxHlsToMp4 ~ startRemuxing ~ missing arguments"
      );
      throw new Error("Item must have an Id and Name");
    }

    writeToLog(
      "INFO",
      `useRemuxHlsToMp4 ~ startRemuxing for item ${item.Id} with url ${url}`
    );

    try {
      setProgress({
        item,
        progress: 0,
      });

      FFmpegKitConfig.enableStatisticsCallback((statistics) => {
        let percentage = 0;

        const videoLength =
          (item.MediaSources?.[0].RunTimeTicks || 0) / 10000000; // In seconds
        const fps = item.MediaStreams?.[0].RealFrameRate || 25;
        const totalFrames = videoLength * fps;

        const processedFrames = statistics.getVideoFrameNumber();
        const speed = statistics.getSpeed();

        if (totalFrames > 0) {
          percentage = Math.floor((processedFrames / totalFrames) * 100);
        }

        setProgress((prev) => {
          return prev?.item.Id === item.Id!
            ? { ...prev, progress: percentage, speed }
            : prev;
        });
      });

      await FFmpegKit.executeAsync(command, async (session) => {
        const returnCode = await session.getReturnCode();
        if (returnCode.isValueSuccess()) {
          const currentFiles: BaseItemDto[] = JSON.parse(
            (await AsyncStorage.getItem("downloaded_files")) || "[]"
          );

          const otherItems = currentFiles.filter((i) => i.Id !== item.Id);

          await AsyncStorage.setItem(
            "downloaded_files",
            JSON.stringify([...otherItems, item])
          );

          writeToLog(
            "INFO",
            `useRemuxHlsToMp4 ~ remuxing completed successfully for item: ${item.Name}`
          );
          setProgress(null);
        } else if (returnCode.isValueError()) {
          console.error("Failed to remux:");
          writeToLog(
            "ERROR",
            `useRemuxHlsToMp4 ~ remuxing failed for item: ${item.Name}`
          );
          setProgress(null);
        } else if (returnCode.isValueCancel()) {
          console.log("Remuxing was cancelled");
          writeToLog(
            "INFO",
            `useRemuxHlsToMp4 ~ remuxing was canceled for item: ${item.Name}`
          );
          setProgress(null);
        }
      });
    } catch (error) {
      console.error("Failed to remux:", error);
      writeToLog(
        "ERROR",
        `useRemuxHlsToMp4 ~ remuxing failed for item: ${item.Name}`
      );
    }
  }, [output, item, command]);

  const cancelRemuxing = useCallback(async () => {
    FFmpegKit.cancel();
    setProgress(null);
    console.log("Remuxing cancelled");
  }, []);

  return { startRemuxing, cancelRemuxing };
};

export const markAsNotPlayed = async ({
  api,
  itemId,
  userId,
}: {
  api?: Api | null;
  itemId?: string | null;
  userId?: string | null;
}) => {
  if (!itemId || !userId || !api) {
    return false;
  }

  try {
    const response = await api.axiosInstance.delete(
      `${api.basePath}/UserPlayedItems/${itemId}`,
      {
        params: {
          userId,
        },
        headers: {
          Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
        },
      }
    );

    if (response.status === 200) return true;
    return false;
  } catch (error) {
    const e = error as any;
    console.error("Failed to report playback progress", e.message, e.status);
    return [];
  }
};

export const markAsPlayed = async ({
  api,
  item,
  userId,
}: {
  api?: Api | null;
  item?: BaseItemDto | null;
  userId?: string | null;
}) => {
  if (!item || !userId || !api || !item.RunTimeTicks) {
    return false;
  }

  const itemId = item.Id;

  try {
    const response = await api.axiosInstance.post(
      `${api.basePath}/UserPlayedItems/${itemId}`,
      {
        userId,
        datePlayed: new Date().toISOString(),
      },
      {
        headers: {
          Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
        },
      }
    );

    const response2 = await api.axiosInstance.post(
      `${api.basePath}/Sessions/Playing/Progress`,
      {
        ItemId: itemId,
        PositionTicks: item.RunTimeTicks,
        MediaSourceId: itemId,
      },
      {
        headers: {
          Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
        },
      }
    );

    console.log(response, response2);

    if (response.status === 200) return true;
    return false;
  } catch (error) {
    const e = error as any;
    console.error("Failed to mark as played:", {
      message: e.message,
      status: e.response?.status,
      statusText: e.response?.statusText,
      url: e.config?.url,
      method: e.config?.method,
      data: e.response?.data,
      headers: e.response?.headers,
    });

    if (e.response) {
      // The request was made and the server responded with a status code
      // that falls out of the range of 2xx
      console.error("Server responded with error:", e.response.data);
    } else if (e.request) {
      // The request was made but no response was received
      console.error("No response received from server");
    } else {
      // Something happened in setting up the request that triggered an Error
      console.error("Error setting up the request:", e.message);
    }
    return [];
  }
};

export const nextUp = async ({
  itemId,
  userId,
  api,
}: {
  itemId?: string | null;
  userId?: string | null;
  api?: Api | null;
}) => {
  if (!userId || !api) {
    return [];
  }

  try {
    const response = await api.axiosInstance.get(
      `${api.basePath}/Shows/NextUp`,
      {
        params: {
          SeriesId: itemId ? itemId : undefined,
          UserId: userId,
          Fields: "MediaSourceCount",
        },
        headers: {
          Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
        },
      }
    );

    return response?.data.Items as BaseItemDto[];
  } catch (error) {
    const e = error as any;
    console.error("Failed to get next up", e.message, e.status);
    return [];
  }
};

export const reportPlaybackStopped = async ({
  api,
  sessionId,
  itemId,
  positionTicks,
}: {
  api: Api | null | undefined;
  sessionId: string | null | undefined;
  itemId: string | null | undefined;
  positionTicks: number | null | undefined;
}) => {
  if (!api || !sessionId || !itemId || !positionTicks) {
    console.log("Missing required parameters", {
      api,
      sessionId,
      itemId,
      positionTicks,
    });
    return;
  }

  try {
    await api.axiosInstance.delete(`${api.basePath}/PlayingItems/${itemId}`, {
      params: {
        playSessionId: sessionId,
        positionTicks: Math.round(positionTicks),
        mediaSourceId: itemId,
      },
      headers: {
        Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
      },
    });
  } catch (error) {
    console.error("Failed to report playback progress", error);
  }
};

export const reportPlaybackProgress = async ({
  api,
  sessionId,
  itemId,
  positionTicks,
}: {
  api: Api | null | undefined;
  sessionId: string | null | undefined;
  itemId: string | null | undefined;
  positionTicks: number | null | undefined;
}) => {
  if (!api || !sessionId || !itemId || !positionTicks) {
    console.log("Missing required parameters", {
      api,
      sessionId,
      itemId,
      positionTicks,
    });
    return;
  }

  try {
    await api.axiosInstance.post(
      `${api.basePath}/Sessions/Playing/Progress`,
      {
        ItemId: itemId,
        PlaySessionId: sessionId,
        IsPaused: false,
        PositionTicks: Math.round(positionTicks),
        CanSeek: true,
        MediaSourceId: itemId,
      },
      {
        headers: {
          Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
        },
      }
    );
  } catch (error) {
    console.error("Failed to report playback progress", error);
  }
};

/**
 *  Fetches the media info for a given item.
 *
 * @param {Api} api - The Jellyfin API instance.
 * @param  {string} itemId - The ID of the media to fetch info for.
 * @param {string} userId - The ID of the user to fetch info for.
 *
 * @returns {Promise<BaseItemDto>} - The media info.
 */
export const getUserItemData = async ({
  api,
  itemId,
  userId,
}: {
  api: Api | null | undefined;
  itemId: string | null | undefined;
  userId: string | null | undefined;
}) => {
  if (!api || !itemId || !userId) {
    return null;
  }
  return (await getUserLibraryApi(api).getItem({ itemId, userId })).data;
};

export const getPlaybackInfo = async (
  api?: Api | null | undefined,
  itemId?: string | null | undefined,
  userId?: string | null | undefined
) => {
  if (!api || !itemId || !userId) {
    return null;
  }

  const a = await getMediaInfoApi(api).getPlaybackInfo({
    itemId,
    userId,
  });

  return a.data;
};

/**
 * Retrieves the playback URL for the given item ID and user ID.
 *
 * @param api - The Jellyfin API instance.
 * @param itemId - The ID of the media item to retrieve playback URL for.
 * @param userId - The ID of the user requesting the playback URL.
 * @returns The playback URL as a string.
 */
export const getPlaybackUrl = async (
  api: Api,
  itemId: string,
  userId: string
): Promise<string> => {
  const playbackData = await getMediaInfoApi(api).getPlaybackInfo({
    itemId,
    userId,
  });

  const mediaSources = playbackData.data?.MediaSources;
  if (!mediaSources || mediaSources.length === 0) {
    throw new Error(
      "No media sources available for the requested item and user."
    );
  }

  const mediaSource = mediaSources[0];
  const transcodeUrl = mediaSource.TranscodingUrl;
  if (transcodeUrl) {
    return transcodeUrl;
  }

  // Construct a fallback URL if the TranscodingUrl is not available
  const { Id, ETag } = mediaSource;
  if (!Id) {
    throw new Error("Media source ID is missing.");
  }

  const queryParams = new URLSearchParams({
    videoBitRate: "4000",
    videoCodec: "h264",
    audioCodec: "aac",
    container: "mp4",
    SegmentContainer: "mp4",
    deviceId: api.deviceInfo?.id || "",
    api_key: api.accessToken || "",
    Tag: ETag || "",
    MediaSourceId: Id || "",
  });

  return `/Videos/${Id}/stream?${queryParams}`;
};

/**
 * Retrieves an item by its ID from the API.
 *
 * @param api - The Jellyfin API instance.
 * @param itemId - The ID of the item to retrieve.
 * @returns The item object or undefined if no item matches the ID.
 */
export const getItemById = async (
  api?: Api | null | undefined,
  itemId?: string | null | undefined
): Promise<BaseItemDto | undefined> => {
  if (!api || !itemId) {
    return undefined;
  }

  try {
    const itemData = await getUserLibraryApi(api).getItem({ itemId });

    const item = itemData.data;
    if (!item) {
      console.error("No items found with the specified ID:", itemId);
      return undefined;
    }

    return item;
  } catch (error) {
    console.error("Failed to retrieve the item:", error);
    throw new Error(`Failed to retrieve the item due to an error: ${error}`);
  }
};

export const getStreamUrl = async ({
  api,
  item,
  userId,
  startTimeTicks = 0,
  maxStreamingBitrate,
  sessionData,
  deviceProfile = iosProfile,
}: {
  api: Api | null | undefined;
  item: BaseItemDto | null | undefined;
  userId: string | null | undefined;
  startTimeTicks: number;
  maxStreamingBitrate?: number;
  sessionData: PlaybackInfoResponse;
  deviceProfile: any;
}) => {
  if (!api || !userId || !item?.Id) {
    return null;
  }

  const itemId = item.Id;

  const response = await api.axiosInstance.post(
    `${api.basePath}/Items/${itemId}/PlaybackInfo`,
    {
      DeviceProfile: deviceProfile,
      UserId: userId,
      MaxStreamingBitrate: maxStreamingBitrate,
      StartTimeTicks: startTimeTicks,
      EnableTranscoding: maxStreamingBitrate ? true : undefined,
      AutoOpenLiveStream: true,
      MediaSourceId: itemId,
      AllowVideoStreamCopy: maxStreamingBitrate ? false : true,
    },
    {
      headers: {
        Authorization: `MediaBrowser DeviceId="${api.deviceInfo.id}", Token="${api.accessToken}"`,
      },
    }
  );

  const mediaSource = response.data.MediaSources?.[0] as MediaSourceInfo;

  if (!mediaSource) {
    throw new Error("No media source");
  }
  if (!sessionData.PlaySessionId) {
    throw new Error("no PlaySessionId");
  }

  if (mediaSource.SupportsDirectPlay) {
    console.log("Using direct stream!");
    return `${api.basePath}/Videos/${itemId}/stream.mp4?playSessionId=${sessionData.PlaySessionId}&mediaSourceId=${itemId}&static=true`;
  }

  console.log("Using transcoded stream!");
  return `${api.basePath}${mediaSource.TranscodingUrl}`;
};

/**
 * Retrieves the primary image URL for a given item.
 *
 * @param api - The Jellyfin API instance.
 * @param item - The media item to retrieve the backdrop image URL for.
 * @param quality - The desired image quality (default: 90).
 */
export const getPrimaryImage = ({
  api,
  item,
  quality = 90,
  width = 500,
}: {
  api?: Api | null;
  item?: BaseItemDto | BaseItemPerson | null;
  quality?: number | null;
  width?: number | null;
}) => {
  if (!item || !api) {
    return null;
  }

  if (!isBaseItemDto(item)) {
    return `${api?.basePath}/Items/${item?.Id}/Images/Primary`;
  }

  const backdropTag = item.BackdropImageTags?.[0];
  const primaryTag = item.ImageTags?.["Primary"];

  const params = new URLSearchParams({
    fillWidth: width ? String(width) : "500",
    quality: quality ? String(quality) : "90",
  });

  if (primaryTag) {
    params.set("tag", primaryTag);
  } else if (backdropTag) {
    params.set("tag", backdropTag);
  }

  return `${api?.basePath}/Items/${
    item.Id
  }/Images/Primary?${params.toString()}`;
};

/**
 * Retrieves the primary image URL for a given item.
 *
 * @param api - The Jellyfin API instance.
 * @param item - The media item to retrieve the backdrop image URL for.
 * @param quality - The desired image quality (default: 90).
 */
export const getPrimaryImageById = ({
  api,
  id,
  quality = 90,
  width = 500,
}: {
  api?: Api | null;
  id?: string | null;
  quality?: number | null;
  width?: number | null;
}) => {
  if (!id) {
    return null;
  }

  const params = new URLSearchParams({
    fillWidth: width ? String(width) : "500",
    quality: quality ? String(quality) : "90",
  });

  return `${api?.basePath}/Items/${id}/Images/Primary?${params.toString()}`;
};

function isBaseItemDto(item: any): item is BaseItemDto {
  return item && "BackdropImageTags" in item && "ImageTags" in item;
}

/**
 * Retrieves the primary image URL for a given item.
 *
 * @param api - The Jellyfin API instance.
 * @param item - The media item to retrieve the backdrop image URL for.
 * @param quality - The desired image quality (default: 10).
 */
export const getLogoImageById = ({
  api,
  item,
}: {
  api?: Api | null;
  item?: BaseItemDto | null;
}) => {
  if (!api || !item) {
    return null;
  }

  const imageTags = item.ImageTags?.["Logo"];

  if (!imageTags) return null;

  const params = new URLSearchParams();

  params.append("tag", imageTags);
  params.append("quality", "90");
  params.append("fillHeight", "130");

  return `${api.basePath}/Items/${item.Id}/Images/Logo?${params.toString()}`;
};

/**
 * Retrieves the primary image URL for a given item.
 *
 * @param api - The Jellyfin API instance.
 * @param item - The media item to retrieve the backdrop image URL for.
 * @param quality - The desired image quality (default: 10).
 */
export const getBackdrop = ({
  api,
  item,
  quality,
  width,
}: {
  api?: Api | null;
  item?: BaseItemDto | null;
  quality?: number;
  width?: number;
}) => {
  if (!api || !item) {
    return null;
  }

  const backdropImageTags = item.BackdropImageTags?.[0];

  const params = new URLSearchParams();

  if (quality) {
    params.append("quality", quality.toString());
  }

  if (width) {
    params.append("fillWidth", width.toString());
  }

  if (backdropImageTags) {
    params.append("tag", backdropImageTags);
    return `${api.basePath}/Items/${
      item.Id
    }/Images/Backdrop/0?${params.toString()}`;
  } else {
    return getPrimaryImage({ api, item, quality, width });
  }
};

/**
 * Builds a stream URL for the given item ID, user ID, and other parameters.
 *
 * @param {object} options - Options to build the stream URL.
 * @param {string} options.deviceId - The device ID of the requesting client.
 * @param {string} options.apiKey - The API key used for authentication.
 * @param {string} options.sessionId - The session ID of the user requesting the stream.
 * @param {string} options.itemId - The ID of the media item to retrieve the stream URL for.
 * @param {string} options.serverUrl - The base URL of the Jellyfin server.
 * @param {string} options.mediaSourceId - The ID of the media source requested.
 * @param {string} options.tag - The ETag tag of the media source.
 *
 * @returns {URL} A URL that can be used to stream the media item.
 */
function buildStreamUrl({
  deviceId,
  apiKey,
  sessionId,
  itemId,
  serverUrl,
  mediaSourceId,
  tag,
}: {
  deviceId: string;
  apiKey: string;
  sessionId: string;
  itemId: string;
  serverUrl: string;
  mediaSourceId: string;
  tag: string;
}): URL {
  const streamParams = new URLSearchParams({
    Static: "true",
    deviceId,
    api_key: apiKey,
    playSessionId: sessionId,
    videoCodec: "h264",
    audioCodec: "aac,mp3,ac3,eac3,flac,alac",
    maxAudioChannels: "6",
    mediaSourceId,
    Tag: tag,
  });
  return new URL(
    `${serverUrl}/Videos/${itemId}/stream.mp4?${streamParams.toString()}`
  );
}

export const bitrateToString = (bitrate: number) => {
  const kbps = bitrate / 1000;
  const mbps = (bitrate / 1000000).toFixed(2);

  return `${mbps} Mb/s`;
};