import 'dart:developer';

import 'package:flutter/foundation.dart';

import 'package:fluffychat/pangea/enum/time_span.dart';
import 'package:fluffychat/pangea/models/student_analytics_summary_model.dart';
import '../enum/use_type.dart';

class TimeSeriesTotals {
  int ta;
  int ga;
  int wa;
  int un;

  int get all => ta + ga + wa + un;

  TimeSeriesTotals({
    required this.ta,
    required this.ga,
    required this.wa,
    required this.un,
  });

  Map<String, dynamic> toJson() => {
        UseType.ta.string: ta,
        UseType.ga.string: ga,
        UseType.wa.string: wa,
        UseType.un.string: un,
      };

  factory TimeSeriesTotals.fromJson(json) => TimeSeriesTotals(
        ta: json[UseType.ta.string],
        ga: json[UseType.ga.string],
        wa: json[UseType.wa.string],
        un: json[UseType.un.string],
      );

  static get empty => TimeSeriesTotals(ta: 0, ga: 0, wa: 0, un: 0);

  int get taPercent => all != 0 ? (ta / all * 100).round() : 0;
  int get gaPercent => all != 0 ? (ga / all * 100).round() : 0;
  int get waPercent => all != 0 ? (wa / all * 100).round() : 0;
  int get unPercent => all != 0 ? (un / all * 100).round() : 0;

  void increment(RecentMessageRecord msg) {
    switch (msg.useType) {
      case UseType.ta:
        ta += 1;
        break;
      case UseType.wa:
        wa += 1;
        break;
      case UseType.ga:
        ga += 1;
        break;
      case UseType.un:
        un += 1;
        break;
      default:
        debugger(when: kDebugMode);
        debugPrint("message with bad type ${msg.toJson()}");
    }
  }
}

class TimeSeriesInterval {
  DateTime start;
  DateTime end;
  TimeSeriesTotals totals;

  TimeSeriesInterval({
    required this.start,
    required this.end,
    required this.totals,
  });

  Map<String, dynamic> toJson() => {
        "strt": start.toIso8601String(),
        "end": end.toIso8601String(),
        "totals": totals.toJson(),
      };

  factory TimeSeriesInterval.fromJson(json) => TimeSeriesInterval(
        start: DateTime.parse(json["strt"]),
        end: DateTime.parse(json["end"]),
        totals: TimeSeriesTotals.fromJson(json["totals"]),
      );
}

class ChartAnalyticsModel {
  final TimeSpan timeSpan;
  final TimeSeriesTotals totals = TimeSeriesTotals.empty;
  final List<RecentMessageRecord> msgs;
  final String? chatId;

  late DateTime fetchedAt;
  late List<TimeSeriesInterval> timeSeries;
  DateTime? lastMessage;

  ChartAnalyticsModel({
    required this.timeSpan,
    required this.msgs,
    this.chatId,
  }) {
    fetchedAt = DateTime.now();
    calculate();
  }

  bool get isEmpty => (totals.ga + totals.ta + totals.wa == 0);

  void calculate() {
    final Map<String, TimeSeriesInterval> intervals = timeSpan.emptyIntervals;
    final DateTime cutOff = timeSpan.cutOffDate;

    final filtered = msgs.where(
      (msg) =>
          (chatId == null || msg.chatId == chatId) && msg.time.isAfter(cutOff),
    );

    //remove msgs with duplicate ids
    final Map<String, RecentMessageRecord> unique = {};
    for (final msg in filtered) {
      if (unique[msg.eventId] == null) {
        unique[msg.eventId] = msg;
      }
    }

    for (final msg in unique.values) {
      final String key = timeSpan.getMapKey(msg.time);
      if (intervals[key] == null) {
        debugger(when: kDebugMode);
      } else {
        intervals[key]!.totals.increment(msg);
        totals.increment(msg);
        lastMessage = msg.time;
      }
    }
    timeSeries = intervals.values.toList().reversed.toList();
  }
}