package com.box.sdk;

import static com.box.sdk.BinaryBodyUtils.writeStream;

import com.eclipsesource.json.Json;
import com.eclipsesource.json.JsonObject;
import com.eclipsesource.json.JsonValue;
import java.io.OutputStream;
import java.net.URL;
import java.text.ParseException;
import java.util.Date;

/** Represents a particular version of a file on Box. */
@BoxResourceType("file_version")
public class BoxFileVersion extends BoxResource {
  /** Content URL Template. */
  public static final URLTemplate CONTENT_URL_TEMPLATE =
      new URLTemplate("files/%s/content?version=%s");
  /** Version URL Template. */
  public static final URLTemplate VERSION_URL_TEMPLATE = new URLTemplate("files/%s/versions/%s");

  /** The default limit of entries per response. */
  public static final long DEFAULT_LIMIT = 1000;

  private String fileID;

  private String versionID;
  private String sha1;
  private String name;
  private long size;
  private String uploaderDisplayName;
  private Date createdAt;
  private Date modifiedAt;
  private BoxUser.Info modifiedBy;
  private Date trashedAt;
  private BoxUser.Info trashedBy;
  private Date restoredAt;
  private BoxUser.Info restoredBy;
  private Date purgedAt;
  private Long versionNumber;

  /**
   * Constructs a BoxFileVersion from a JSON string.
   *
   * @param api the API connection to be used by the file.
   * @param json the JSON encoded file version.
   * @param fileID the ID of the file.
   */
  public BoxFileVersion(BoxAPIConnection api, String json, String fileID) {
    this(api, Json.parse(json).asObject(), fileID);
  }

  BoxFileVersion(BoxAPIConnection api, JsonObject jsonObject, String fileID) {
    super(api, jsonObject.get("id").asString());

    this.fileID = fileID;
    this.parseJSON(jsonObject);
  }

  /**
   * Method used to update fields with values received from API.
   *
   * @param jsonObject JSON-encoded info about File Version object.
   */
  private void parseJSON(JsonObject jsonObject) {
    for (JsonObject.Member member : jsonObject) {
      JsonValue value = member.getValue();
      if (value.isNull()) {
        continue;
      }

      try {
        String memberName = member.getName();
        if (memberName.equals("id")) {
          this.versionID = value.asString();
        } else if (memberName.equals("sha1")) {
          this.sha1 = value.asString();
        } else if (memberName.equals("name")) {
          this.name = value.asString();
        } else if (memberName.equals("size")) {
          this.size = Double.valueOf(value.toString()).longValue();
        } else if (memberName.equals("uploader_display_name")) {
          this.uploaderDisplayName = value.asString();
        } else if (memberName.equals("created_at")) {
          this.createdAt = BoxDateFormat.parse(value.asString());
        } else if (memberName.equals("modified_at")) {
          this.modifiedAt = BoxDateFormat.parse(value.asString());
        } else if (memberName.equals("trashed_at")) {
          this.trashedAt = BoxDateFormat.parse(value.asString());
        } else if (memberName.equals("trashed_by")) {
          JsonObject userJSON = value.asObject();
          String userID = userJSON.get("id").asString();
          BoxUser user = new BoxUser(getAPI(), userID);
          this.trashedBy = user.new Info(userJSON);
        } else if (memberName.equals("modified_by")) {
          JsonObject userJSON = value.asObject();
          String userID = userJSON.get("id").asString();
          BoxUser user = new BoxUser(getAPI(), userID);
          this.modifiedBy = user.new Info(userJSON);
        } else if (memberName.equals("restored_at")) {
          this.restoredAt = BoxDateFormat.parse(value.asString());
        } else if (memberName.equals("restored_by")) {
          JsonObject userJSON = value.asObject();
          String userID = userJSON.get("id").asString();
          BoxUser user = new BoxUser(getAPI(), userID);
          this.restoredBy = user.new Info(userJSON);
        } else if (memberName.equals("purged_at")) {
          this.purgedAt = BoxDateFormat.parse(value.asString());
        } else if (memberName.equals("version_number")) {
          this.versionNumber = Long.parseLong(value.asString());
        }
      } catch (ParseException e) {
        assert false : "A ParseException indicates a bug in the SDK.";
      }
    }
  }

  /** @return the file id this file version belongs to. */
  public String getFileID() {
    return this.fileID;
  }

  /**
   * Used if no or wrong file id was set with constructor.
   *
   * @param fileID the file id this file version belongs to.
   */
  public void setFileID(String fileID) {
    this.fileID = fileID;
  }

  /**
   * Gets the version ID of this version of the file.
   *
   * @return the version ID of this version of the file.
   */
  public String getVersionID() {
    return this.versionID;
  }

  /**
   * Gets the SHA1 hash of this version of the file.
   *
   * @return the SHA1 hash of this version of the file.
   */
  public String getSha1() {
    return this.sha1;
  }

  /**
   * Gets the name of this version of the file.
   *
   * @return the name of this version of the file.
   */
  public String getName() {
    return this.name;
  }

  /**
   * Gets the size of this version of the file.
   *
   * @return the size of this version of the file.
   */
  public long getSize() {
    return this.size;
  }

  /**
   * Gets the time that this version of the file was created.
   *
   * @return the time that this version of the file was created.
   */
  public Date getCreatedAt() {
    return this.createdAt;
  }

  /**
   * Gets the user's name at the time of upload.
   *
   * @return the time user's name at the time of upload.
   */
  public String getUploaderDisplayName() {
    return this.uploaderDisplayName;
  }

  /**
   * Gets the time that this version of the file was modified.
   *
   * @return the time that this version of the file was modified.
   */
  public Date getModifiedAt() {
    return this.modifiedAt;
  }

  /**
   * Gets the time that this version of the file was deleted.
   *
   * @return the time that this version of the file was deleted.
   */
  public Date getTrashedAt() {
    return this.trashedAt;
  }

  /**
   * Gets information about the user who trashed this version of the file.
   *
   * @return info about the user who trashed this version of the file.
   */
  public BoxUser.Info getTrashedBy() {
    return this.trashedBy;
  }

  /**
   * Gets information about the user who last modified this version of the file.
   *
   * @return info about the user who last modified this version of the file.
   */
  public BoxUser.Info getModifiedBy() {
    return this.modifiedBy;
  }

  /**
   * Gets the time that this version of the file was restored.
   *
   * @return the time that this version of the file was restored.
   */
  public Date getRestoredAt() {
    return this.restoredAt;
  }

  /**
   * Gets information about the user who restored this version of the file.
   *
   * @return info about the user who restored this version of the file.
   */
  public BoxUser.Info getRestoredBy() {
    return this.restoredBy;
  }

  /**
   * Gets the time that this version of the file was purged.
   *
   * @return the time that this version of the file was purged.
   */
  public Date getPurgedAt() {
    return this.purgedAt;
  }

  /**
   * Returns version number.
   *
   * @return version number
   */
  public Long getVersionNumber() {
    return versionNumber;
  }

  /** Deletes this version of the file. */
  public void delete() {
    URL url = VERSION_URL_TEMPLATE.build(this.getAPI().getBaseURL(), this.fileID, this.getID());
    BoxAPIRequest request = new BoxAPIRequest(this.getAPI(), url, "DELETE");
    request.send().close();
  }

  /**
   * Downloads this version of the file to a given OutputStream.
   *
   * @param output the stream to where the file will be written.
   */
  public void download(OutputStream output) {
    this.download(output, null);
  }

  /**
   * Downloads this version of the file to a given OutputStream while reporting the progress to a
   * ProgressListener.
   *
   * @param output the stream to where the file will be written.
   * @param listener a listener for monitoring the download's progress.
   */
  public void download(OutputStream output, ProgressListener listener) {
    URL url = CONTENT_URL_TEMPLATE.build(this.getAPI().getBaseURL(), this.fileID, this.getID());
    BoxAPIRequest request = new BoxAPIRequest(this.getAPI(), url, "GET");
    writeStream(request.send(), output, listener);
  }

  /** Promotes this version of the file to be the latest version. */
  public void promote() {
    URL url = VERSION_URL_TEMPLATE.buildAlpha(this.getAPI().getBaseURL(), this.fileID, "current");

    JsonObject jsonObject = new JsonObject();
    jsonObject.add("type", "file_version");
    jsonObject.add("id", this.getID());

    BoxJSONRequest request = new BoxJSONRequest(this.getAPI(), url, "POST");
    request.setBody(jsonObject.toString());
    try (BoxJSONResponse response = request.send()) {
      this.parseJSON(Json.parse(response.getJSON()).asObject());
    }
  }
}