import android.content.ContentUris
import android.content.Context
import android.database.Cursor
import android.net.Uri
import android.os.Build
import android.os.Environment
import android.provider.DocumentsContract
import android.provider.MediaStore
import android.support.v4.content.CursorLoader
import android.text.TextUtils
import com.github.ajalt.timberkt.e


object RealPathUtil {
    
    fun getRealPath(context: Context, fileUri: Uri): String? {
        val realPath: String?
        if (Build.VERSION.SDK_INT < 11) {
            // SDK < 11
            realPath = RealPathUtil.getRealPathFromUriBelowAPI11(context, fileUri)
        } else if (Build.VERSION.SDK_INT < 19) {
            // SDK >= 11 && SDK < 19
            realPath = RealPathUtil.getRealPathFromUriAPI11to18(context, fileUri)
        } else {
            // SDK > 19 (Android 4.4) and up
            realPath = RealPathUtil.getRealPathFromUriAPI19(context, fileUri)
        }
        return realPath
    }


    private fun getRealPathFromUriAPI11to18(context: Context, contentUri: Uri): String? {
        val proj = arrayOf(MediaStore.Images.Media.DATA)
        var result: String? = null

        val cursorLoader = CursorLoader(context, contentUri, proj, null, null, null)
        val cursor = cursorLoader.loadInBackground()

        if (cursor != null) {
            val column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA)
            cursor.moveToFirst()
            result = cursor.getString(column_index)
            cursor.close()
        }
        return result
    }

    private fun getRealPathFromUriBelowAPI11(context: Context, contentUri: Uri): String {
        val proj = arrayOf(MediaStore.Images.Media.DATA)
        val cursor = context.contentResolver.query(contentUri, proj, null, null, null)
        var column_index = 0
        var result = ""
        if (cursor != null) {
            column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA)
            cursor.moveToFirst()
            result = cursor.getString(column_index)
            cursor.close()
            return result
        }
        return result
    }

    /**
     * Get a file path from a Uri. This will get the the path for Storage Access
     * Framework Documents, as well as the _data field for the MediaStore and
     * other file-based ContentProviders.
     *
     * @param context The context.
     * @param uri     The Uri to query.
     * @author paulburke
     */
    private fun getRealPathFromUriAPI19(context: Context, uri: Uri): String? {

        val isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                val docId = DocumentsContract.getDocumentId(uri)
                val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
                val type = split[0]

                if ("primary".equals(type, ignoreCase = true)) {
                    val path = StringBuilder()
                    path.append(Environment.getExternalStorageDirectory())
                    path.append("/")
                    path.append(split[1])
                    return path.toString()
                }

                // TODO handle non-primary volumes
            } else if (isDownloadsDocument(uri)) {
                val id = DocumentsContract.getDocumentId(uri)
                if (!TextUtils.isEmpty(id)) {
                    if (id.startsWith("raw:")) {
                        return id.replaceFirst("raw:", "");
                    }
                    return try {
                        val contentUri = ContentUris.withAppendedId(
                                Uri.parse("content://downloads/public_downloads"), java.lang.Long.valueOf(id))

                        getDataColumn(context, contentUri, null, null)
                    } catch (e: NumberFormatException) {
                        e(e)
                        null
                    }
                }
            } else if (isMediaDocument(uri)) {
                val docId = DocumentsContract.getDocumentId(uri)
                val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
                val type = split[0]

                var contentUri: Uri? = null
                if ("image" == type) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
                } else if ("video" == type) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
                } else if ("audio" == type) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
                }

                val selection = "_id=?"
                val selectionArgs = arrayOf(split[1])

                return getDataColumn(context, contentUri, selection, selectionArgs)
            }// MediaProvider
            // DownloadsProvider
        } else if ("content".equals(uri.scheme, ignoreCase = true)) {

            // Return the remote address
            return if (isGooglePhotosUri(uri)) uri.lastPathSegment else getDataColumn(context, uri, null, null)

        } else if ("file".equals(uri.scheme, ignoreCase = true)) {
            return uri.path
        }// File
        // MediaStore (and general)

        return null
    }

    /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context       The context.
     * @param uri           The Uri to query.
     * @param selection     (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    private fun getDataColumn(context: Context, uri: Uri?, selection: String?,
                      selectionArgs: Array<String>?): String? {

        var cursor: Cursor? = null
        val column = "_data"
        val projection = arrayOf(column)

        try {
            cursor = context.contentResolver.query(uri!!, projection, selection, selectionArgs, null)
            if (cursor != null && cursor!!.moveToFirst()) {
                val index = cursor!!.getColumnIndexOrThrow(column)
                return cursor!!.getString(index)
            }
        } finally {
            if (cursor != null)
                cursor!!.close()
        }
        return null
    }


    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    private fun isExternalStorageDocument(uri: Uri): Boolean {
        return "com.android.externalstorage.documents" == uri.authority
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    private fun isDownloadsDocument(uri: Uri): Boolean {
        return "com.android.providers.downloads.documents" == uri.authority
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    private fun isMediaDocument(uri: Uri): Boolean {
        return "com.android.providers.media.documents" == uri.authority
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is Google Photos.
     */
    private fun isGooglePhotosUri(uri: Uri): Boolean {
        return "com.google.android.apps.photos.content" == uri.authority
    }

}