package com.rolster.capacitor.update;

public class UpdateManagerUtils {
  public static String getStatusUpdate(
    int numberStore,
    int numberApp,
    int minorMandatory,
    int patchMandatory, 
    int splitCount) {
    UpdateManagerVersion versionApp = createVersion(numberApp, splitCount);
    UpdateManagerVersion versionStore = createVersion(numberStore, splitCount);

    return getStatus(versionStore, versionApp, minorMandatory, patchMandatory);
  }

  private static String getStatus(
    UpdateManagerVersion versionStore,
    UpdateManagerVersion versionApp,
    int minorMandatory,
    int patchMandatory) {
    if (versionStore.major > versionApp.major) {
      return "mandatory";
    }

    if (versionStore.minor > versionApp.minor) {
      int minorCount = versionStore.minor - versionApp.minor;

      return minorCount >= minorMandatory ? "mandatory" : "flexible";
    }

    if (versionStore.minor == versionApp.minor && versionStore.patch > versionApp.patch) {
      int patchCount = versionStore.patch - versionApp.patch;

      return patchCount >= patchMandatory ? 
        "mandatory" : patchCount >= minorMandatory ? "flexible" : "optional";
    }

    return "unnecessary";
  }

  private static UpdateManagerVersion createVersion(int versionCode, int splitCount) {
    String code = padZeros(String.valueOf(versionCode), splitCount * 3);

    int limitPatch = code.length() - splitCount;
    int limitMinor = limitPatch - splitCount;

    int codePatch = Integer.parseInt(code.substring(limitPatch));
    int codeMinor = Integer.parseInt(code.substring(limitMinor, limitPatch));
    int codeMajor = Integer.parseInt(code.substring(0, limitMinor));

    return new UpdateManagerVersion(codeMajor, codeMinor, codePatch);
  }

  private static String padZeros(String inputString, int length) {
    if (inputString.length() >= length) {
      return inputString;
    }

    StringBuilder sb = new StringBuilder();

    while (sb.length() < length - inputString.length()) {
      sb.append('0');
    }

    sb.append(inputString);

    return sb.toString();
  }
}