xianyan/lib/features/discover/models/chat_session.dart

// ============================================================
// 闲言APP — 会话模型
// 创建时间: 2026-05-01
// 更新时间: 2026-06-08
// 作用: 发现页面会话列表数据模型，支持置顶/隐藏/备注/已读/免打扰
// 上次更新: 添加systemIcon getter，系统会话使用CupertinoIcons替代emoji
// ============================================================

import 'package:flutter/cupertino.dart';
import 'package:xianyan/l10n/types/t_discover_base.dart';

enum ChatSessionType {
  chat('chat', '会话流'),
  discover('discover', '发现'),
  footprint('footprint', '足迹'),
  custom('custom', '自定义'),
  readlater('readlater', '稍后读');

  const ChatSessionType(this.id, this.label);
  final String id;
  final String label;
}

class ChatSession {
  const ChatSession({
    required this.id,
    required this.type,
    required this.emoji,
    required this.name,
    required this.lastMessage,
    required this.lastTime,
    this.remark,
    this.isPinned = false,
    this.isHidden = false,
    this.unreadCount = 0,
    this.isMuted = false,
    this.route,
    this.tag,
    this.subtitle,
    this.linkedNoteId,
  });

  final String id;
  final ChatSessionType type;
  final String emoji;
  final String name;
  final String lastMessage;
  final DateTime lastTime;
  final String? remark;
  final bool isPinned;
  final bool isHidden;
  final int unreadCount;
  final bool isMuted;
  final String? route;
  final String? tag;
  final String? subtitle;

  /// 关联的笔记ID，用于"在发现中置顶"功能
  final int? linkedNoteId;

  /// 是否为置顶笔记会话
  bool get isPinnedNote => linkedNoteId != null;

  String get displayName => remark ?? name;

  String get displayTime {
    final now = DateTime.now();
    final today = DateTime(now.year, now.month, now.day);
    final yesterday = today.subtract(const Duration(days: 1));
    final msgDate = DateTime(lastTime.year, lastTime.month, lastTime.day);

    if (msgDate == today) {
      return '${lastTime.hour.toString().padLeft(2, '0')}:${lastTime.minute.toString().padLeft(2, '0')}';
    } else if (msgDate == yesterday) {
      return '昨天';
    } else if (lastTime.year == now.year) {
      return '${lastTime.month.toString().padLeft(2, '0')}/${lastTime.day.toString().padLeft(2, '0')}';
    } else {
      return '${lastTime.year}/${lastTime.month.toString().padLeft(2, '0')}/${lastTime.day.toString().padLeft(2, '0')}';
    }
  }

  ChatSession copyWith({
    String? id,
    ChatSessionType? type,
    String? emoji,
    String? name,
    String? lastMessage,
    DateTime? lastTime,
    String? remark,
    bool? isPinned,
    bool? isHidden,
    int? unreadCount,
    bool? isMuted,
    String? route,
    String? tag,
    String? subtitle,
    int? linkedNoteId,
    bool clearLinkedNoteId = false,
  }) {
    return ChatSession(
      id: id ?? this.id,
      type: type ?? this.type,
      emoji: emoji ?? this.emoji,
      name: name ?? this.name,
      lastMessage: lastMessage ?? this.lastMessage,
      lastTime: lastTime ?? this.lastTime,
      remark: remark ?? this.remark,
      isPinned: isPinned ?? this.isPinned,
      isHidden: isHidden ?? this.isHidden,
      unreadCount: unreadCount ?? this.unreadCount,
      isMuted: isMuted ?? this.isMuted,
      route: route ?? this.route,
      tag: tag ?? this.tag,
      subtitle: subtitle ?? this.subtitle,
      linkedNoteId: clearLinkedNoteId ? null : (linkedNoteId ?? this.linkedNoteId),
    );
  }
}

/// 系统会话ID常量（唯一权威定义，Provider层引用此处）
class SystemSessionIds {
  static const readlater = 'readlater';
  static const discover = 'discover';
  static const footprint = 'footprint';
  static const dailyCard = 'daily_card';
  static const template = 'template';
  static const readingReport = 'reading_report';
  static const weather = 'weather';
  static const poetry = 'poetry';
  static const countdown = 'countdown';
  static const dailyFortune = 'daily_fortune';
  static const solarTerm = 'solar_term';
  static const knowledgeGraph = 'knowledge_graph';
  static const studyPlan = 'study_plan';
  static const progress = 'progress';
  static const fileTransfer = 'file_transfer';
  static const rssFeed = 'rss_feed';
  static const translate = 'translate';
  static const leisure = 'leisure';
  static const ctcNoteRepo = 'ctc_note_repo';

  static const all = {
    readlater,
    discover,
    footprint,
    dailyCard,
    template,
    readingReport,
    weather,
    poetry,
    countdown,
    dailyFortune,
    solarTerm,
    knowledgeGraph,
    studyPlan,
    progress,
    fileTransfer,
    rssFeed,
    translate,
    leisure,
    ctcNoteRepo,
  };

  static bool isSystem(String id) => all.contains(id);
}

/// 会话多语言扩展 — 在UI层实时解析翻译，切换语言时自动响应
extension ChatSessionL10n on ChatSession {
  /// 获取本地化的显示名称（优先使用备注，其次使用翻译名）
  String localizedName(TDiscoverBase t) {
    if (remark != null && remark!.isNotEmpty) return remark!;
    final translated = _resolveName(t);
    return translated ?? name;
  }

  /// 获取本地化的描述/最后消息
  String localizedLastMessage(TDiscoverBase t) {
    final translated = _resolveDesc(t);
    return translated ?? lastMessage;
  }

  /// 获取本地化的副标题
  String localizedSubtitle(TDiscoverBase t) {
    final translated = _resolveDesc(t);
    return translated ?? subtitle ?? lastMessage;
  }

  /// 是否为系统会话（需要翻译）
  bool get isSystemSession => SystemSessionIds.isSystem(id);

  /// 系统会话对应的 CupertinoIcon，非系统会话返回 null
  IconData? get systemIcon {
    switch (id) {
      case SystemSessionIds.readlater:
        return CupertinoIcons.book_fill;
      case SystemSessionIds.discover:
        return CupertinoIcons.lightbulb_fill;
      case SystemSessionIds.footprint:
        return CupertinoIcons.location_fill;
      case SystemSessionIds.dailyCard:
        return CupertinoIcons.calendar;
      case SystemSessionIds.template:
        return CupertinoIcons.paintbrush_fill;
      case SystemSessionIds.readingReport:
        return CupertinoIcons.chart_bar_fill;
      case SystemSessionIds.weather:
        return CupertinoIcons.cloud_sun_fill;
      case SystemSessionIds.poetry:
        return CupertinoIcons.doc_text_fill;
      case SystemSessionIds.dailyFortune:
        return CupertinoIcons.star_circle_fill;
      case SystemSessionIds.solarTerm:
        return CupertinoIcons.tree;
      case SystemSessionIds.knowledgeGraph:
        return CupertinoIcons.link_circle_fill;
      case SystemSessionIds.studyPlan:
        return CupertinoIcons.book_circle_fill;
      case SystemSessionIds.progress:
        return CupertinoIcons.gauge;
      case SystemSessionIds.fileTransfer:
        return CupertinoIcons.folder_fill;
      case SystemSessionIds.rssFeed:
        return CupertinoIcons.antenna_radiowaves_left_right;
      case SystemSessionIds.translate:
        return CupertinoIcons.globe;
      case SystemSessionIds.leisure:
        return CupertinoIcons.sparkles;
      case SystemSessionIds.ctcNoteRepo:
        return CupertinoIcons.doc_text_search;
      default:
        return null;
    }
  }

  String? _resolveName(TDiscoverBase t) {
    switch (id) {
      case SystemSessionIds.readlater:
        return t.sessionReadLater;
      case SystemSessionIds.discover:
        return t.sessionInspiration;
      case SystemSessionIds.footprint:
        return t.sessionFootprint;
      case SystemSessionIds.dailyCard:
        return t.sessionDailyCard;
      case SystemSessionIds.template:
        return t.sessionTemplate;
      case SystemSessionIds.readingReport:
        return t.sessionReadingReport;
      case SystemSessionIds.weather:
        return t.sessionWeather;
      case SystemSessionIds.poetry:
        return t.sessionPoetry;
      case SystemSessionIds.dailyFortune:
        return t.sessionDailyFortune;
      case SystemSessionIds.solarTerm:
        return t.sessionSolarTerm;
      case SystemSessionIds.knowledgeGraph:
        return t.sessionKnowledgeGraph;
      case SystemSessionIds.studyPlan:
        return t.sessionStudyPlan;
      case SystemSessionIds.progress:
        return t.sessionProgress;
      case SystemSessionIds.fileTransfer:
        return t.sessionFileTransfer;
      case SystemSessionIds.rssFeed:
        return t.sessionRssFeed;
      case SystemSessionIds.translate:
        return t.sessionTranslate;
      case SystemSessionIds.leisure:
        return t.sessionLeisure;
      case SystemSessionIds.ctcNoteRepo:
        return t.sessionCtcNoteRepo;
      default:
        return null;
    }
  }

  String? _resolveDesc(TDiscoverBase t) {
    switch (id) {
      case SystemSessionIds.readlater:
        return t.sessionReadLaterDesc;
      case SystemSessionIds.discover:
        return t.sessionInspirationDesc;
      case SystemSessionIds.footprint:
        return t.sessionFootprintDesc;
      case SystemSessionIds.dailyCard:
        return t.sessionDailyCardDesc;
      case SystemSessionIds.template:
        return t.sessionTemplateDesc;
      case SystemSessionIds.readingReport:
        return t.sessionReadingReportDesc;
      case SystemSessionIds.weather:
        return t.sessionWeatherDesc;
      case SystemSessionIds.poetry:
        return t.sessionPoetryDesc;
      case SystemSessionIds.dailyFortune:
        return t.sessionDailyFortuneDesc;
      case SystemSessionIds.solarTerm:
        return t.sessionSolarTermDesc;
      case SystemSessionIds.knowledgeGraph:
        return t.sessionKnowledgeGraphDesc;
      case SystemSessionIds.studyPlan:
        return t.sessionStudyPlanDesc;
      case SystemSessionIds.progress:
        return t.sessionProgressDesc;
      case SystemSessionIds.fileTransfer:
        return t.sessionFileTransferDesc;
      case SystemSessionIds.rssFeed:
        return t.sessionRssFeedDesc;
      case SystemSessionIds.translate:
        return t.sessionTranslateDesc;
      case SystemSessionIds.leisure:
        return t.sessionLeisureDesc;
      case SystemSessionIds.ctcNoteRepo:
        return t.sessionCtcNoteRepoDesc;
      default:
        return null;
    }
  }
}