import 'dart:typed_data';

import 'package:equatable/equatable.dart';
import 'package:logging/logging.dart';
import 'package:nc_photos/account.dart';
import 'package:nc_photos/ci_string.dart';
import 'package:nc_photos/debug_util.dart';
import 'package:nc_photos/entity/exif.dart';
import 'package:nc_photos/or_null.dart';
import 'package:nc_photos/string_extension.dart';
import 'package:nc_photos/type.dart';
import 'package:path/path.dart' as path_util;

int compareFileDateTimeDescending(File x, File y) {
  final tmp = y.bestDateTime.compareTo(x.bestDateTime);
  if (tmp != 0) {
    return tmp;
  } else {
    // compare file name if files are modified at the same time
    return x.path.compareTo(y.path);
  }
}

/// Immutable object that hold metadata of a [File]
class Metadata with EquatableMixin {
  Metadata({
    DateTime? lastUpdated,
    this.fileEtag,
    this.imageWidth,
    this.imageHeight,
    this.exif,
  }) : lastUpdated = (lastUpdated ?? DateTime.now()).toUtc();

  @override
  // ignore: hash_and_equals
  bool operator ==(Object? other) => equals(other, isDeep: true);

  bool equals(Object? other, {bool isDeep = false}) {
    if (other is Metadata) {
      return super == other &&
          (exif == null) == (other.exif == null) &&
          (exif?.equals(other.exif, isDeep: isDeep) ?? true);
    } else {
      return false;
    }
  }

  /// Parse Metadata from [json]
  ///
  /// If the version saved in json does not match the active one, the
  /// corresponding upgrader will be called one by one to upgrade the json,
  /// version by version until it reached the active version. If any upgrader
  /// in the chain is null, the upgrade process will fail
  static Metadata? fromJson(
    JsonObj json, {
    required MetadataUpgraderV1? upgraderV1,
    required MetadataUpgraderV2? upgraderV2,
  }) {
    final jsonVersion = json["version"];
    JsonObj? result = json;
    if (jsonVersion < 2) {
      result = upgraderV1?.call(result);
      if (result == null) {
        _log.info("[fromJson] Version $jsonVersion not compatible");
        return null;
      }
    }
    if (jsonVersion < 3) {
      result = upgraderV2?.call(result);
      if (result == null) {
        _log.info("[fromJson] Version $jsonVersion not compatible");
        return null;
      }
    }
    return Metadata(
      lastUpdated: result["lastUpdated"] == null
          ? null
          : DateTime.parse(result["lastUpdated"]),
      fileEtag: result["fileEtag"],
      imageWidth: result["imageWidth"],
      imageHeight: result["imageHeight"],
      exif: result["exif"] == null
          ? null
          : Exif.fromJson(result["exif"].cast<String, dynamic>()),
    );
  }

  JsonObj toJson() {
    return {
      "version": version,
      "lastUpdated": lastUpdated.toIso8601String(),
      if (fileEtag != null) "fileEtag": fileEtag,
      if (imageWidth != null) "imageWidth": imageWidth,
      if (imageHeight != null) "imageHeight": imageHeight,
      if (exif != null) "exif": exif!.toJson(),
    };
  }

  Metadata copyWith({
    OrNull<DateTime>? lastUpdated,
    String? fileEtag,
    int? imageWidth,
    int? imageHeight,
    Exif? exif,
  }) {
    return Metadata(
      lastUpdated:
          lastUpdated == null ? null : (lastUpdated.obj ?? this.lastUpdated),
      fileEtag: fileEtag ?? this.fileEtag,
      imageWidth: imageWidth ?? this.imageWidth,
      imageHeight: imageHeight ?? this.imageHeight,
      exif: exif ?? this.exif,
    );
  }

  @override
  toString() {
    var product = "$runtimeType {"
        "lastUpdated: $lastUpdated, ";
    if (fileEtag != null) {
      product += "fileEtag: $fileEtag, ";
    }
    if (imageWidth != null) {
      product += "imageWidth: $imageWidth, ";
    }
    if (imageHeight != null) {
      product += "imageHeight: $imageHeight, ";
    }
    if (exif != null) {
      product += "exif: $exif, ";
    }
    return product + "}";
  }

  @override
  get props => [
        lastUpdated,
        fileEtag,
        imageWidth,
        imageHeight,
        // exif is handled separately, see [equals]
      ];

  final DateTime lastUpdated;

  /// Etag of the parent file when the metadata is saved
  final String? fileEtag;
  final int? imageWidth;
  final int? imageHeight;
  final Exif? exif;

  /// versioning of this class, use to upgrade old persisted metadata
  static const version = 3;

  static final _log = Logger("entity.file.Metadata");
}

abstract class MetadataUpgrader {
  JsonObj? call(JsonObj json);
}

/// Upgrade v1 Metadata to v2
class MetadataUpgraderV1 implements MetadataUpgrader {
  MetadataUpgraderV1({
    required this.fileContentType,
    this.logFilePath,
  });

  @override
  JsonObj? call(JsonObj json) {
    if (fileContentType == "image/webp") {
      // Version 1 metadata for webp is bugged, drop it
      _log.fine("[call] Upgrade v1 metadata for file: $logFilePath");
      return null;
    } else {
      return json;
    }
  }

  final String? fileContentType;

  /// File path for logging only
  final String? logFilePath;

  static final _log = Logger("entity.file.MetadataUpgraderV1");
}

/// Upgrade v2 Metadata to v3
class MetadataUpgraderV2 implements MetadataUpgrader {
  MetadataUpgraderV2({
    required this.fileContentType,
    this.logFilePath,
  });

  @override
  JsonObj? call(JsonObj json) {
    if (fileContentType == "image/jpeg") {
      // Version 2 metadata for jpeg doesn't consider orientation
      if (json["exif"] != null && json["exif"].containsKey("Orientation")) {
        // Check orientation
        final orientation = json["exif"]["Orientation"];
        if (orientation >= 5 && orientation <= 8) {
          _log.fine("[call] Upgrade v2 metadata for file: $logFilePath");
          final temp = json["imageWidth"];
          json["imageWidth"] = json["imageHeight"];
          json["imageHeight"] = temp;
        }
      }
    }
    return json;
  }

  final String? fileContentType;

  /// File path for logging only
  final String? logFilePath;

  static final _log = Logger("entity.file.MetadataUpgraderV2");
}

class File with EquatableMixin {
  File({
    required String path,
    this.contentLength,
    this.contentType,
    this.etag,
    this.lastModified,
    this.isCollection,
    this.usedBytes,
    this.hasPreview,
    this.fileId,
    this.ownerId,
    this.metadata,
    this.isArchived,
    this.overrideDateTime,
    this.trashbinFilename,
    this.trashbinOriginalLocation,
    this.trashbinDeletionTime,
  }) : path = path.trimAny("/");

  @override
  // ignore: hash_and_equals
  bool operator ==(Object? other) => equals(other, isDeep: true);

  bool equals(Object? other, {bool isDeep = false}) {
    if (other is File) {
      return super == other &&
          (metadata == null) == (other.metadata == null) &&
          (metadata?.equals(other.metadata, isDeep: isDeep) ?? true);
    } else {
      return false;
    }
  }

  factory File.fromJson(JsonObj json) {
    return File(
      path: json["path"],
      contentLength: json["contentLength"],
      contentType: json["contentType"],
      etag: json["etag"],
      lastModified: json["lastModified"] == null
          ? null
          : DateTime.parse(json["lastModified"]),
      isCollection: json["isCollection"],
      usedBytes: json["usedBytes"],
      hasPreview: json["hasPreview"],
      fileId: json["fileId"],
      ownerId: json["ownerId"] == null ? null : CiString(json["ownerId"]),
      trashbinFilename: json["trashbinFilename"],
      trashbinOriginalLocation: json["trashbinOriginalLocation"],
      trashbinDeletionTime: json["trashbinDeletionTime"] == null
          ? null
          : DateTime.parse(json["trashbinDeletionTime"]),
      metadata: json["metadata"] == null
          ? null
          : Metadata.fromJson(
              json["metadata"].cast<String, dynamic>(),
              upgraderV1: MetadataUpgraderV1(
                fileContentType: json["contentType"],
                logFilePath: json["path"],
              ),
              upgraderV2: MetadataUpgraderV2(
                fileContentType: json["contentType"],
                logFilePath: json["path"],
              ),
            ),
      isArchived: json["isArchived"],
      overrideDateTime: json["overrideDateTime"] == null
          ? null
          : DateTime.parse(json["overrideDateTime"]),
    );
  }

  @override
  toString() {
    var product = "$runtimeType {"
        "path: '$path', ";
    if (contentLength != null) {
      product += "contentLength: $contentLength, ";
    }
    if (contentType != null) {
      product += "contentType: '$contentType', ";
    }
    if (etag != null) {
      product += "etag: '$etag', ";
    }
    if (lastModified != null) {
      product += "lastModified: $lastModified, ";
    }
    if (isCollection != null) {
      product += "isCollection: $isCollection, ";
    }
    if (usedBytes != null) {
      product += "usedBytes: $usedBytes, ";
    }
    if (hasPreview != null) {
      product += "hasPreview: $hasPreview, ";
    }
    if (fileId != null) {
      product += "fileId: $fileId, ";
    }
    if (ownerId != null) {
      product += "ownerId: '$ownerId', ";
    }
    if (trashbinFilename != null) {
      product += "trashbinFilename: '$trashbinFilename', ";
    }
    if (trashbinOriginalLocation != null) {
      product += "trashbinOriginalLocation: '$trashbinOriginalLocation', ";
    }
    if (trashbinDeletionTime != null) {
      product += "trashbinDeletionTime: $trashbinDeletionTime, ";
    }
    if (metadata != null) {
      product += "metadata: $metadata, ";
    }
    if (isArchived != null) {
      product += "isArchived: $isArchived, ";
    }
    if (overrideDateTime != null) {
      product += "overrideDateTime: $overrideDateTime, ";
    }
    return product + "}";
  }

  JsonObj toJson() {
    return {
      "path": path,
      if (contentLength != null) "contentLength": contentLength,
      if (contentType != null) "contentType": contentType,
      if (etag != null) "etag": etag,
      if (lastModified != null)
        "lastModified": lastModified!.toUtc().toIso8601String(),
      if (isCollection != null) "isCollection": isCollection,
      if (usedBytes != null) "usedBytes": usedBytes,
      if (hasPreview != null) "hasPreview": hasPreview,
      if (fileId != null) "fileId": fileId,
      if (ownerId != null) "ownerId": ownerId.toString(),
      if (trashbinFilename != null) "trashbinFilename": trashbinFilename,
      if (trashbinOriginalLocation != null)
        "trashbinOriginalLocation": trashbinOriginalLocation,
      if (trashbinDeletionTime != null)
        "trashbinDeletionTime": trashbinDeletionTime!.toUtc().toIso8601String(),
      if (metadata != null) "metadata": metadata!.toJson(),
      if (isArchived != null) "isArchived": isArchived,
      if (overrideDateTime != null)
        "overrideDateTime": overrideDateTime!.toUtc().toIso8601String(),
    };
  }

  File copyWith({
    String? path,
    int? contentLength,
    String? contentType,
    String? etag,
    DateTime? lastModified,
    bool? isCollection,
    int? usedBytes,
    bool? hasPreview,
    int? fileId,
    CiString? ownerId,
    String? trashbinFilename,
    String? trashbinOriginalLocation,
    DateTime? trashbinDeletionTime,
    OrNull<Metadata>? metadata,
    OrNull<bool>? isArchived,
    OrNull<DateTime>? overrideDateTime,
  }) {
    return File(
      path: path ?? this.path,
      contentLength: contentLength ?? this.contentLength,
      contentType: contentType ?? this.contentType,
      etag: etag ?? this.etag,
      lastModified: lastModified ?? this.lastModified,
      isCollection: isCollection ?? this.isCollection,
      usedBytes: usedBytes ?? this.usedBytes,
      hasPreview: hasPreview ?? this.hasPreview,
      fileId: fileId ?? this.fileId,
      ownerId: ownerId ?? this.ownerId,
      trashbinFilename: trashbinFilename ?? this.trashbinFilename,
      trashbinOriginalLocation:
          trashbinOriginalLocation ?? this.trashbinOriginalLocation,
      trashbinDeletionTime: trashbinDeletionTime ?? this.trashbinDeletionTime,
      metadata: metadata == null ? this.metadata : metadata.obj,
      isArchived: isArchived == null ? this.isArchived : isArchived.obj,
      overrideDateTime: overrideDateTime == null
          ? this.overrideDateTime
          : overrideDateTime.obj,
    );
  }

  @override
  get props => [
        path,
        contentLength,
        contentType,
        etag,
        lastModified,
        isCollection,
        usedBytes,
        hasPreview,
        fileId,
        ownerId,
        trashbinFilename,
        trashbinOriginalLocation,
        trashbinDeletionTime,
        // metadata is handled separately, see [equals]
        isArchived,
        overrideDateTime,
      ];

  final String path;
  final int? contentLength;
  final String? contentType;
  final String? etag;
  final DateTime? lastModified;
  final bool? isCollection;
  final int? usedBytes;
  final bool? hasPreview;
  // maybe null when loaded from old cache
  final int? fileId;
  final CiString? ownerId;
  final String? trashbinFilename;
  final String? trashbinOriginalLocation;
  final DateTime? trashbinDeletionTime;
  // metadata
  final Metadata? metadata;
  final bool? isArchived;
  final DateTime? overrideDateTime;
}

extension FileExtension on File {
  DateTime get bestDateTime {
    try {
      return overrideDateTime ??
          metadata?.exif?.dateTimeOriginal ??
          lastModified ??
          DateTime.now().toUtc();
    } catch (e) {
      _log.severe(
          "[bestDateTime] Non standard EXIF DateTimeOriginal '${metadata?.exif?.data["DateTimeOriginal"]}' for file: ${logFilename(path)}",
          e);
      return lastModified ?? DateTime.now().toUtc();
    }
  }

  bool isOwned(CiString username) => ownerId == null || ownerId == username;

  /// Return the path of this file with the DAV part stripped
  ///
  /// WebDAV file path: remote.php/dav/files/{username}/{strippedPath}
  String get strippedPath {
    if (path.contains("remote.php/dav/files")) {
      final position = path.indexOf("/", "remote.php/dav/files/".length) + 1;
      if (position == 0) {
        // root dir path
        return ".";
      } else {
        return path.substring(position);
      }
    } else {
      return path;
    }
  }

  String get filename => path_util.basename(path);

  /// Compare the server identity of two Files
  ///
  /// Return true if two Files point to the same file on server. Be careful that
  /// this does NOT mean that the two Files are identical
  bool compareServerIdentity(File other) {
    if (fileId != null && other.fileId != null) {
      return fileId == other.fileId;
    } else {
      return path == other.path;
    }
  }

  static final _log = Logger("entity.file.FileExtension");
}

class FileServerIdentityComparator {
  const FileServerIdentityComparator(this.file);

  @override
  operator ==(Object other) {
    if (other is FileServerIdentityComparator) {
      return file.compareServerIdentity(other.file);
    } else if (other is File) {
      return file.compareServerIdentity(other);
    } else {
      return false;
    }
  }

  @override
  get hashCode => file.fileId?.hashCode ?? file.path.hashCode;

  final File file;
}

class FileRepo {
  const FileRepo(this.dataSrc);

  /// See [FileDataSource.list]
  Future<List<File>> list(Account account, File root) =>
      dataSrc.list(account, root);

  /// See [FileDataSource.listSingle]
  Future<File> listSingle(Account account, File root) =>
      dataSrc.listSingle(account, root);

  /// See [FileDataSource.remove]
  Future<void> remove(Account account, File file) =>
      dataSrc.remove(account, file);

  /// See [FileDataSource.getBinary]
  Future<Uint8List> getBinary(Account account, File file) =>
      dataSrc.getBinary(account, file);

  /// See [FileDataSource.putBinary]
  Future<void> putBinary(Account account, String path, Uint8List content) =>
      dataSrc.putBinary(account, path, content);

  /// See [FileDataSource.updateMetadata]
  Future<void> updateProperty(
    Account account,
    File file, {
    OrNull<Metadata>? metadata,
    OrNull<bool>? isArchived,
    OrNull<DateTime>? overrideDateTime,
  }) =>
      dataSrc.updateProperty(
        account,
        file,
        metadata: metadata,
        isArchived: isArchived,
        overrideDateTime: overrideDateTime,
      );

  /// See [FileDataSource.copy]
  Future<void> copy(
    Account account,
    File f,
    String destination, {
    bool? shouldOverwrite,
  }) =>
      dataSrc.copy(
        account,
        f,
        destination,
        shouldOverwrite: shouldOverwrite,
      );

  /// See [FileDataSource.move]
  Future<void> move(
    Account account,
    File f,
    String destination, {
    bool? shouldOverwrite,
  }) =>
      dataSrc.move(
        account,
        f,
        destination,
        shouldOverwrite: shouldOverwrite,
      );

  /// See [FileDataSource.createDir]
  Future<void> createDir(Account account, String path) =>
      dataSrc.createDir(account, path);

  final FileDataSource dataSrc;
}

abstract class FileDataSource {
  /// List all files under [f]
  Future<List<File>> list(Account account, File f);

  /// List a single file [f]
  Future<File> listSingle(Account account, File f);

  /// Remove file
  Future<void> remove(Account account, File f);

  /// Read file as binary array
  Future<Uint8List> getBinary(Account account, File f);

  /// Upload content to [path]
  Future<void> putBinary(Account account, String path, Uint8List content);

  /// Update one or more properties of a file
  Future<void> updateProperty(
    Account account,
    File f, {
    OrNull<Metadata>? metadata,
    OrNull<bool>? isArchived,
    OrNull<DateTime>? overrideDateTime,
  });

  /// Copy [f] to [destination]
  ///
  /// [destination] should be a relative WebDAV path like
  /// remote.php/dav/files/admin/new/location
  Future<void> copy(
    Account account,
    File f,
    String destination, {
    bool? shouldOverwrite,
  });

  /// Move [f] to [destination]
  ///
  /// [destination] should be a relative WebDAV path like
  /// remote.php/dav/files/admin/new/location
  Future<void> move(
    Account account,
    File f,
    String destination, {
    bool? shouldOverwrite,
  });

  /// Create a directory at [path]
  ///
  /// [path] should be a relative WebDAV path like
  /// remote.php/dav/files/admin/new/dir
  Future<void> createDir(Account account, String path);
}