syntax = "proto3";

package next_edu_cloud.analytics.v1;

// AnalyticsService 数据分析服务契约（D6 智能洞察领域）.
// P4 启用 gRPC server 端口 50055，HTTP 3006 保留作 Gateway 直连降级.
// 所有 RPC 返回 ActionState 信封（success/data/error/details.degraded）.
service AnalyticsService {
  // 班级成绩分析（平均分/及格率/参考人数）.
  rpc GetClassPerformance(GetClassPerformanceRequest) returns (ClassPerformance);
  // 学生薄弱知识点（mastery_level < 0.6）.
  rpc GetStudentWeakness(GetStudentWeaknessRequest) returns (StudentWeakness);
  // 学习趋势（历史成绩曲线）.
  rpc GetLearningTrend(GetLearningTrendRequest) returns (LearningTrend);
  // 教师仪表盘聚合（班级概览 + 待办 + 预警）.
  rpc GetTeacherDashboard(GetTeacherDashboardRequest) returns (TeacherDashboard);
  // 学生仪表盘（个人学情 + 排名 + 薄弱点）.
  rpc GetStudentDashboard(GetStudentDashboardRequest) returns (StudentDashboard);
  // 家长仪表盘（孩子学情概览）.
  rpc GetParentDashboard(GetParentDashboardRequest) returns (ParentDashboard);
  // 管理员仪表盘（全校统计 + AI 用量）.
  rpc GetAdminDashboard(GetAdminDashboardRequest) returns (AdminDashboard);
  // 预警列表查询（按班级/严重度/时间过滤）.
  rpc GetWarnings(GetWarningsRequest) returns (WarningList);
  // 手动触发预警（管理员/教师主动标记关注）.
  rpc TriggerWarning(TriggerWarningRequest) returns (TriggerWarningResponse);
  // 班级掌握度分布（mastered/progressing/weak 三档）.
  rpc GetMasteryDistribution(GetMasteryDistributionRequest) returns (MasteryDistribution);
  // 学生知识点掌握度明细.
  rpc GetStudentMastery(GetStudentMasteryRequest) returns (StudentMastery);
  // 订阅掌握度更新（server-streaming，P5+ AI 个性化推荐实时推送通道）.
  rpc SubscribeMasteryUpdate(SubscribeMasteryUpdateRequest) returns (stream MasteryUpdateEvent);

  // ===== P6+ v2 扩展 RPC（响应上游 parent-bff / student-bff v2 请求） =====
  // 学生成长档案（综合成绩趋势 + 掌握度变化 + 考勤统计，供 parent-bff GrowthArchiveService）.
  rpc GetStudentGrowth(GetStudentGrowthRequest) returns (StudentGrowth);
  // 作业/考试分析（单次作业/考试维度统计，供 student-bff / parent-bff）.
  rpc GetAssignmentAnalysis(GetAssignmentAnalysisRequest) returns (AssignmentAnalysis);
  // 学生掌握度汇总（轻量级，仅返回总体掌握度 + 三档分布，供 parent-bff MasteryService.GetSummary）.
  rpc GetMasterySummary(GetMasterySummaryRequest) returns (MasterySummary);
  // 诊断报告列表（占位实现，真实数据需 ai 服务集成，供 parent-bff / student-bff）.
  rpc ListDiagnosticReports(ListDiagnosticReportsRequest) returns (DiagnosticReportList);
  // 错题本列表（gRPC 版本，供 parent-bff ErrorBookService.List）.
  rpc ListErrorBookItems(ListErrorBookItemsRequest) returns (ErrorBookList);
  // 错题本统计（按知识点聚合，供 parent-bff ErrorBookService.GetStats）.
  rpc GetErrorBookStats(GetErrorBookStatsRequest) returns (ErrorBookStats);
}

// ===== 请求消息 =====

message GetClassPerformanceRequest {
  string class_id = 1;
  string subject_id = 2;
  int64 start_date = 3; // Unix timestamp（秒）
  int64 end_date = 4;
}

message GetStudentWeaknessRequest {
  string student_id = 1;
  string subject_id = 2;
}

message GetLearningTrendRequest {
  string student_id = 1;
  int64 start_date = 2;
  int64 end_date = 3;
  string subject_id = 4;
}

message GetTeacherDashboardRequest {
  string user_id = 1;
  string class_id = 2; // 可选，不传则返回教师全部班级
}

message GetStudentDashboardRequest {
  string user_id = 1;
}

message GetParentDashboardRequest {
  string user_id = 1;
  string student_id = 2; // 家长查看指定孩子
}

message GetAdminDashboardRequest {
  string user_id = 1;
  string scope = 2; // ALL / SCHOOL / DISTRICT
  string scope_id = 3; // 具体范围 ID
}

message GetWarningsRequest {
  string class_id = 1;
  string severity = 2; // INFO / WARN / CRITICAL
  int64 since = 3; // Unix timestamp（秒）
}

message TriggerWarningRequest {
  string target_id = 1; // 学生 ID
  string warning_type = 2; // LOW_MASTERY / SCORE_DROP / ABSENT_FREQUENT
  string severity = 3; // INFO / WARN / CRITICAL
}

message GetMasteryDistributionRequest {
  string class_id = 1;
  string subject_id = 2;
  string knowledge_point_id = 3; // 可选
}

message GetStudentMasteryRequest {
  string student_id = 1;
  string subject_id = 2; // 可选
}

message SubscribeMasteryUpdateRequest {
  string student_id = 1; // 可选，订阅指定学生
  string class_id = 2; // 可选，订阅指定班级全部学生
}

// ===== P6+ v2 扩展 RPC 请求消息 =====

message GetStudentGrowthRequest {
  string student_id = 1;
  int64 start_date = 2; // Unix timestamp（秒）
  int64 end_date = 3;
  string subject_id = 4; // 可选
}

message GetAssignmentAnalysisRequest {
  string class_id = 1;
  string assignment_id = 2; // exam_id 或 homework_id
  string subject_id = 3; // 可选
}

message GetMasterySummaryRequest {
  string student_id = 1;
  string subject_id = 2; // 可选
}

message ListDiagnosticReportsRequest {
  string student_id = 1;
  int64 since = 2; // Unix timestamp（秒）
  int32 limit = 3; // 默认 10
}

message ListErrorBookItemsRequest {
  string student_id = 1;
  string subject_id = 2; // 可选，按学科过滤
  int32 limit = 3; // 默认 100
  int32 offset = 4; // 分页偏移
}

message GetErrorBookStatsRequest {
  string student_id = 1;
  string subject_id = 2; // 可选
}

// ===== 响应消息 =====

message ClassPerformance {
  string class_id = 1;
  double average_score = 2;
  double pass_rate = 3;
  int32 total_students = 4;
  repeated StudentScore scores = 5;
}

message StudentScore {
  string student_id = 1;
  double score = 2;
  string grade = 3;
}

message StudentWeakness {
  string student_id = 1;
  repeated WeakPoint weak_points = 2;
}

message WeakPoint {
  string knowledge_point_id = 1;
  string title = 2;
  double mastery = 3;
  int32 error_count = 4;
}

message LearningTrend {
  string student_id = 1;
  repeated TrendPoint points = 2;
}

message TrendPoint {
  int64 date = 1;
  double score = 2;
}

message TeacherDashboard {
  string user_id = 1;
  int32 total_classes = 2;
  int32 total_students = 3;
  double class_avg_score = 4;
  int32 pending_homework_count = 5;
  repeated ClassSummary classes = 6;
  repeated StudentSummary top_students = 7;
  repeated WarningInfo recent_warnings = 8;
}

message ClassSummary {
  string class_id = 1;
  string class_name = 2;
  int32 student_count = 3;
  double average_score = 4;
}

message StudentSummary {
  string student_id = 1;
  string student_name = 2;
  double score = 3;
  int32 rank_in_class = 4;
}

message StudentDashboard {
  string user_id = 1;
  double avg_score = 2;
  int32 class_rank = 3;
  int32 total_students = 4;
  repeated WeakPoint weak_points = 5;
  repeated TrendPoint recent_trends = 6;
  int32 pending_homework = 7;
}

message ParentDashboard {
  string user_id = 1;
  string student_id = 2;
  double child_avg_score = 3;
  int32 child_class_rank = 4;
  int32 total_class_students = 5;
  repeated WeakPoint child_weak_points = 6;
  repeated WarningInfo child_warnings = 7;
}

message AdminDashboard {
  string user_id = 1;
  int32 total_teachers = 2;
  int32 total_students = 3;
  int32 total_classes = 4;
  double school_avg_score = 5;
  repeated WarningInfo recent_warnings = 6;
  AIUsageSummary ai_usage = 7;
}

message AIUsageSummary {
  int64 total_requests = 1;
  int64 total_tokens = 2;
  int64 total_cost_cents = 3;
  repeated AIUsageByProvider by_provider = 4;
}

message AIUsageByProvider {
  string provider = 1;
  int64 request_count = 2;
  int64 total_tokens = 3;
  int64 cost_cents = 4;
}

message WarningList {
  repeated WarningInfo warnings = 1;
  int32 total = 2;
}

message WarningInfo {
  string warning_id = 1;
  string warning_type = 2; // LOW_MASTERY / CRITICAL_LOW / SCORE_DROP / ABSENT_FREQUENT / TREND_DECLINE
  string target_id = 3; // 学生 ID
  string target_name = 4;
  double threshold = 5;
  double current_value = 6;
  string severity = 7; // INFO / WARN / CRITICAL
  int64 occurred_at = 8; // Unix timestamp（秒）
}

message TriggerWarningResponse {
  string warning_id = 1;
  bool triggered = 2;
}

message MasteryDistribution {
  string class_id = 1;
  int32 mastered_count = 2; // mastery >= 0.8
  int32 progressing_count = 3; // 0.4 <= mastery < 0.8
  int32 weak_count = 4; // mastery < 0.4
  int32 total_students = 5;
}

message StudentMastery {
  string student_id = 1;
  repeated KnowledgePointMastery knowledge_points = 2;
  double overall_mastery = 3;
}

message KnowledgePointMastery {
  string knowledge_point_id = 1;
  string title = 2;
  string subject_id = 3;
  double mastery_level = 4; // 0.0-1.0
  string mastery_label = 5; // mastered / progressing / weak
  int64 calculated_at = 6; // Unix timestamp（秒）
}

message MasteryUpdateEvent {
  string event_id = 1;
  string student_id = 2;
  string knowledge_point_id = 3;
  double mastery_level = 4;
  double previous_level = 5;
  int64 calculated_at = 6; // Unix timestamp（秒）
}

// ===== P6+ v2 扩展 RPC 响应消息 =====

message StudentGrowth {
  string student_id = 1;
  // 成绩趋势（来自 LearningTrend）
  repeated TrendPoint score_trend = 2;
  // 掌握度变化趋势（按时间排序的快照）
  repeated MasteryTrendPoint mastery_trend = 3;
  // 考勤统计
  AttendanceSummary attendance = 4;
  // 总体成长评分（综合分数、掌握度、考勤计算）
  double growth_score = 5;
  // 成长等级（excellent / good / average / needs_improvement）
  string growth_level = 6;
}

message MasteryTrendPoint {
  int64 calculated_at = 1;
  double overall_mastery = 2;
}

message AttendanceSummary {
  int32 total_days = 1;
  int32 present_days = 2;
  int32 absent_days = 3;
  int32 late_days = 4;
  double attendance_rate = 5; // 出勤率 0.0-1.0
}

message AssignmentAnalysis {
  string assignment_id = 1;
  string class_id = 2;
  string subject_id = 3;
  double average_score = 4;
  double highest_score = 5;
  double lowest_score = 6;
  int32 total_students = 7;
  int32 submitted_count = 8;
  double pass_rate = 9; // 及格率
  // 分数段分布（90-100 / 80-89 / 70-79 / 60-69 / <60）
  repeated ScoreRange ranges = 10;
}

message ScoreRange {
  string label = 1; // "90-100" / "80-89" etc.
  int32 count = 2;
  double percentage = 3; // 占比 0.0-1.0
}

message MasterySummary {
  string student_id = 1;
  double overall_mastery = 2; // 0.0-1.0
  int32 mastered_count = 3; // mastery >= 0.8
  int32 progressing_count = 4; // 0.4 <= mastery < 0.8
  int32 weak_count = 5; // mastery < 0.4
  int32 total_knowledge_points = 6;
  string mastery_level = 7; // mastered / progressing / weak（总体）
}

message DiagnosticReportList {
  string student_id = 1;
  repeated DiagnosticReport reports = 2;
  int32 total = 3;
}

message DiagnosticReport {
  string report_id = 1;
  string student_id = 2;
  string report_type = 3; // KNOWLEDGE_GAP / LEARNING_STYLE / WEAKNESS_ANALYSIS
  string title = 4;
  string summary = 5; // 报告摘要
  int64 generated_at = 6; // Unix timestamp（秒）
  string status = 7; // pending / completed / failed
}

message ErrorBookList {
  string student_id = 1;
  repeated ErrorBookItem items = 2;
  int32 total = 3;
}

message ErrorBookItem {
  string question_id = 1;
  string knowledge_point_id = 2;
  string knowledge_point_title = 3;
  int32 error_count = 4;
  int64 last_error_time = 5; // Unix timestamp（秒）
  string content = 6; // 题目内容摘要
}

message ErrorBookStats {
  string student_id = 1;
  int32 total_error_questions = 2;
  int32 total_error_count = 3; // 总错误次数
  // 按知识点聚合的错题统计
  repeated KnowledgePointErrorStats by_knowledge_point = 4;
  // 最近 7 天错误次数
  int32 recent_7d_errors = 5;
}

message KnowledgePointErrorStats {
  string knowledge_point_id = 1;
  string title = 2;
  int32 error_count = 3;
  int32 question_count = 4;
  double error_rate = 5; // 错误率 0.0-1.0
}