import 'dart:async';
import 'dart:core' as core;
import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:isar/isar.dart';
import 'package:stackwallet/models/isar/models/log.dart';
import 'package:stackwallet/utilities/constants.dart';
import 'package:stackwallet/utilities/enums/log_level_enum.dart';

export 'enums/log_level_enum.dart';

class Logging {
  static final isTestEnv = Platform.environment["FLUTTER_TEST"] == "true";
  Logging._();
  static final Logging _instance = Logging._();
  static Logging get instance => _instance;

  static const core.int defaultPrintLength = 1020;

  late final Isar? isar;

  Future<void> init(Isar isar) async {
    this.isar = isar;
  }

  Future<void> initInIsolate() async {
    if (isTestEnv) {
      // do this for now until we mock Isar properly for testing
      isar = null;
      return;
    }
    isar = await Isar.open(
      [LogSchema],
      inspector: false,
    );
  }

  void log(
    core.Object? object, {
    required LogLevel level,
    core.bool printToConsole = true,
    core.bool printFullLength = false,
  }) {
    if (isTestEnv) {
      Logger.print(object, normalLength: !printFullLength);
      return;
    }
    final now = core.DateTime.now().toUtc();
    final log = Log()
      ..message = object.toString()
      ..logLevel = level
      ..timestampInMillisUTC = now.millisecondsSinceEpoch;
    if (level == LogLevel.Error || level == LogLevel.Fatal) {
      printFullLength = true;
    }

    isar!.writeTxnSync(() => log.id = isar!.logs.putSync(log));

    if (printToConsole) {
      final core.String logStr = "Log: ${log.toString()}";
      final core.int logLength = logStr.length;

      if (!printFullLength || logLength <= defaultPrintLength) {
        debugPrint(logStr);
      } else {
        core.int start = 0;
        core.int endIndex = defaultPrintLength;
        core.int tmpLogLength = logLength;
        while (endIndex < logLength) {
          debugPrint(logStr.substring(start, endIndex));
          endIndex += defaultPrintLength;
          start += defaultPrintLength;
          tmpLogLength -= defaultPrintLength;
        }
        if (tmpLogLength > 0) {
          debugPrint(logStr.substring(start, logLength));
        }
      }
    }
  }
}

abstract class Logger {
  static final isTestEnv = Platform.environment["FLUTTER_TEST"] == "true";

  static void print(
    core.Object? object, {
    core.bool withTimeStamp = true,
    core.bool normalLength = true,
  }) async {
    if (Constants.disableLogger && !isTestEnv) {
      return;
    }
    final utcTime = withTimeStamp ? "${core.DateTime.now().toUtc()}: " : "";
    core.int defaultPrintLength = 1020 - utcTime.length;
    if (normalLength) {
      debugPrint("$utcTime$object");
    } else if (object == null ||
        object.toString().length <= defaultPrintLength) {
      debugPrint("$utcTime$object");
    } else {
      core.String log = object.toString();
      core.int start = 0;
      core.int endIndex = defaultPrintLength;
      core.int logLength = log.length;
      core.int tmpLogLength = log.length;
      while (endIndex < logLength) {
        debugPrint(utcTime + log.substring(start, endIndex));
        endIndex += defaultPrintLength;
        start += defaultPrintLength;
        tmpLogLength -= defaultPrintLength;
      }
      if (tmpLogLength > 0) {
        debugPrint(utcTime + log.substring(start, logLength));
      }
    }
  }
}