import 'package:flutter/material.dart';
import 'package:timemanage/model/project.dart';
import 'package:timemanage/model/timer_entry.dart';

abstract class DataProvider {
  Future<Project> createProject({required String name, Color? colour});
  Future<List<Project>> listProjects();
  Future<void> editProject(Project project);
  Future<void> deleteProject(Project project);
  Future<TimerEntry> createTimer({
    String? description,
    int? projectID,
    DateTime? startTime,
    DateTime? endTime,
  });
  Future<List<TimerEntry>> listTimers();
  Future<void> editTimer(TimerEntry timer);
  Future<void> deleteTimer(TimerEntry timer);

  Future<void> import(DataProvider other) async {
    List<TimerEntry> otherEntries = await other.listTimers();
    List<Project> otherProjects = await other.listProjects();

    List<Project> newOtherProjects = await Stream.fromIterable(otherProjects)
        .asyncMap((event) => createProject(name: event.name))
        .toList();

    for (TimerEntry otherEntry in otherEntries) {
      int projectOffset = otherProjects
          .indexWhere((element) => element.id == otherEntry.projectID);
      int? projectID;
      if (projectOffset >= 0) {
        projectID = newOtherProjects[projectOffset].id;
      }

      await createTimer(
        description: otherEntry.description,
        projectID: projectID,
        startTime: otherEntry.startTime,
        endTime: otherEntry.endTime,
      );
    }
  }
}