import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../api/statistics_api.dart';
import '../models/statistics_response.dart';
import '../utils/date_util.dart';

/// 统计页的时间粒度
enum StatisticsTab { daily, weekly, monthly }

class StatisticsTabNotifier extends Notifier<StatisticsTab> {
  @override
  StatisticsTab build() => StatisticsTab.monthly; // 对齐 uniApp 默认按月

  void set(StatisticsTab tab) => state = tab;
}

final statisticsTabProvider =
    NotifierProvider<StatisticsTabNotifier, StatisticsTab>(StatisticsTabNotifier.new);

/// 按时间粒度取统计。日期范围在 provider 内按"当前时刻"计算，
/// 与 uniApp 行为一致：日=今天，周=本周一~今天，月=本自然月。
final statisticsProvider =
    FutureProvider.autoDispose.family<StatisticsResponse, StatisticsTab>((ref, tab) {
  final api = ref.watch(statisticsApiProvider);
  final now = DateTime.now();
  switch (tab) {
    case StatisticsTab.daily:
      final today = formatDate(now);
      return api.getDaily(startDate: today, endDate: today);
    case StatisticsTab.weekly:
      return api.getWeekly(weekStart: formatDate(weekStart(now)));
    case StatisticsTab.monthly:
      return api.getMonthly(year: now.year, month: now.month);
  }
});