import { Component } from 'react';
import { NativeModules, Image, Platform } from 'react-native';
import { Configuration } from './configuration';

const { RNVideoEditorSDK } = NativeModules;

function resolveStaticAsset(assetSource, extractURI = true) {
  const resolvedSource = Image.resolveAssetSource(assetSource);
  const source = (resolvedSource != null) ? resolvedSource : assetSource;
  if (extractURI) {
    return (source == null) ? null : ((source.uri != null) ? source.uri : source);
  }
  return source
}

function getNestedObject(nestedObject, pathArray) {
  return pathArray.reduce((obj, key) =>
      (obj && obj[key] !== 'undefined') ? obj[key] : undefined, nestedObject);
}

function resolveNestedAsset(nestedObject, pathArray) {
  let asset = getNestedObject(nestedObject, pathArray);
  // Resolve `asset` if it is a number (opaque type returned by require('./foo.png'))
  if (asset && typeof asset === 'number') {
    let key = pathArray.pop();
    let obj = getNestedObject(nestedObject, pathArray);
    obj[key] = resolveStaticAsset(asset);
  }
}

function resolveStaticAssets(configuration) {
  let videoClipCategories = getNestedObject(configuration, ["composition", "categories"]);
  if (videoClipCategories) {
    for (let category of videoClipCategories) {
      resolveNestedAsset(category, ["thumbnailURI"]);
      let videoClips = getNestedObject(category, ["items"]);
      if (videoClips) {
        for (let videoClip of videoClips) {
          resolveNestedAsset(videoClip, ["thumbnailURI"]);
          resolveNestedAsset(videoClip, ["videoURI"]);
        }
      }
    }
  }
  let audioClipCategories = getNestedObject(configuration, ["audio", "categories"]);
  if (audioClipCategories) {
    for (let category of audioClipCategories) {
      resolveNestedAsset(category, ["thumbnailURI"]);
      let audioClips = getNestedObject(category, ["items"]);
      if (audioClips) {
        for (let audioClip of audioClips) {
          resolveNestedAsset(audioClip, ["thumbnailURI"]);
          resolveNestedAsset(audioClip, ["audioURI"]);
        }
      }
    }
  }
  let filterCategories = getNestedObject(configuration, ["filter", "categories"]);
  if (filterCategories) {
    for (let category of filterCategories) {
      resolveNestedAsset(category, ["thumbnailURI"]);
      let filters = getNestedObject(category, ["items"]);
      if (filters) {
        for (let filter of filters) {
          resolveNestedAsset(filter, ["lutURI"]);
        }
      }
    }
  }
  let stickerCategories = getNestedObject(configuration, ["sticker", "categories"]);
  if (stickerCategories) {
    for (let category of stickerCategories) {
      resolveNestedAsset(category, ["thumbnailURI"]);
      let stickers = getNestedObject(category, ["items"]);
      if (stickers) {
        for (let sticker of stickers) {
          resolveNestedAsset(sticker, ["thumbnailURI"]);
          resolveNestedAsset(sticker, ["stickerURI"]);
        }
      }
    }
  }
  let fonts = getNestedObject(configuration, ["text", "fonts"]);
  if (fonts) {
    for (let font of fonts) {
      resolveNestedAsset(font, ["fontURI"]);
    }
  }
  let overlays = getNestedObject(configuration, ["overlay", "items"]);
  if (overlays) {
    for (let overlay of overlays) {
      resolveNestedAsset(overlay, ["thumbnailURI"]);
      resolveNestedAsset(overlay, ["overlayURI"]);
    }
  }
  let frames = getNestedObject(configuration, ["frame", "items"]);
  if (frames) {
    for (let frame of frames) {
      resolveNestedAsset(frame, ["thumbnailURI"]);
      resolveNestedAsset(frame, ["imageGroups", "top", "startURI"]);
      resolveNestedAsset(frame, ["imageGroups", "top", "midURI"]);
      resolveNestedAsset(frame, ["imageGroups", "top", "endURI"]);
      resolveNestedAsset(frame, ["imageGroups", "left", "startURI"]);
      resolveNestedAsset(frame, ["imageGroups", "left", "midURI"]);
      resolveNestedAsset(frame, ["imageGroups", "left", "endURI"]);
      resolveNestedAsset(frame, ["imageGroups", "right", "startURI"]);
      resolveNestedAsset(frame, ["imageGroups", "right", "midURI"]);
      resolveNestedAsset(frame, ["imageGroups", "right", "endURI"]);
      resolveNestedAsset(frame, ["imageGroups", "bottom", "startURI"]);
      resolveNestedAsset(frame, ["imageGroups", "bottom", "midURI"]);
      resolveNestedAsset(frame, ["imageGroups", "bottom", "endURI"]);
    }
  }
}

class VESDK {
  /**
   * Modally present a video editor.
   * @note Edited videos from remote resources can be previewed in the editor but their export will
   * fail! Remote video resources are currently supported for debugging purposes only, e.g., when
   * loading videos with `require('./video.mp4')` for debug builds static video assets will be
   * resolved to remote URLs served by the development packager.
   *
   * @param {AssetURI | [AssetURI] | {uri: string}} video The source of the video to be edited.
   * Can be either an URI (local only), an object with a member `uri`, or an asset reference
   * which can be optained by, e.g., `require('./video.mp4')` as `number`.
   *
   * For video compositions an array of video sources is accepted as input. If an empty array is
   * passed to the editor `videoSize` must be set. You need to obtain a **valid license** for this 
   * feature to work.
   * @param {Configuration} configuration The configuration used to initialize the editor.
   * @param {object} serialization The serialization used to initialize the editor. This
   * restores a previous state of the editor by re-applying all modifications to the loaded
   * video.
   * @param {Size} videoSize **Video composition only:** The size of the video in pixels that is about to be edited.
   * This overrides the natural dimensions of the video(s) passed to the editor. All videos will
   * be fitted to the `videoSize` aspect by adding black bars on the left and right side or top and bottom.
   *
   * @return {Promise<VideoEditorResult>} Returns a `VideoEditorResult` or `null` if the editor
   * is dismissed without exporting the edited video.
   */
  static openEditor(video, configuration = null, serialization = null, videoSize = null) {
    resolveStaticAssets(configuration)
      const videoDimensions = videoSize == null ? (Platform.OS == 'android' ? null : {height: 0, width: 0}) : videoSize;
      const resolvedSerialization = Platform.OS == 'android' ? (serialization != null ? JSON.stringify(serialization) : null) : serialization;

      if (Array.isArray(video)) {
        var source: Array<any> = [];

        video.forEach((videoClip) => {
          source.push(resolveStaticAsset(videoClip, Platform.OS == 'android'));
        });
        return RNVideoEditorSDK.presentComposition(source, configuration, resolvedSerialization, videoDimensions);
      } else {
        if (videoSize != null) {
          console.warn("Ignoring the video size. This parameter can only be used in combination with video compositions. If your license includes the video composition feature please wrap your video source into an array instead.")
        }
        const resolvedVideo = resolveStaticAsset(video, Platform.OS == 'android');
        return RNVideoEditorSDK.present(resolvedVideo, configuration, resolvedSerialization);
      }
  }

  /**
   * Unlock VideoEditor SDK with a license.
   *
   * @param {string | object} license The license used to unlock the SDK. Can be either an URI
   * pointing to a local `file://` resource that contains the license, the license as a string,
   * or the license as an object which can be optained by, e.g., `require('./vesdk_license')`
   * where the required license files must be named `./vesdk_license.ios.json` for the iOS license
   * and `./vesdk_license.android.json` for the Android license file in order to get automatically
   * resolved by the packager.
   */
  static unlockWithLicense(license) {
    if (Platform.OS == 'android') {
      RNVideoEditorSDK.unlockWithLicense(JSON.stringify(license));
    } else {
      RNVideoEditorSDK.unlockWithLicense(license);
    }
  }
}

class VideoEditorModal extends Component {
  state = {
    visible: false
  }

  static getDerivedStateFromProps = (props, state) => {
    const { video, configuration, serialization, videoSize, onExport, onCancel, onError } = props;
    if (props.visible  && !state.visible) {
      VESDK.openEditor(video, configuration, serialization, videoSize).then(result => {
        if (result !== null) {
          onExport(result);
        } else {
          if (onCancel) {
            onCancel();
          }
        }
      }).catch((error) => {
        if (onError) {
          onError(error);
        }
      });
    }

    return ({ visible: props.visible })
  }

  render() {
    return null;
  }
}

export { VESDK, VideoEditorModal };
export * from './configuration';