package models

import "time"

const (
	ExamStatusDraft     = "draft"
	ExamStatusReady     = "ready"
	ExamStatusEnded     = "ended"
	ExamStatusCancelled = "cancelled"
)

// ExamRoom — phòng thi độc lập với lớp học
type ExamRoom struct {
	ID          uint      `gorm:"primaryKey" json:"id"`
	CreatedAt   time.Time `json:"createdAt"`
	UpdatedAt   time.Time `json:"updatedAt"`
	Name        string    `gorm:"column:name;size:255;not null" json:"name"`
	StartTime   time.Time `gorm:"column:start_time;not null;index" json:"startTime"`
	EndTime     time.Time `gorm:"column:end_time;not null;index" json:"endTime"`
	AllowedApps string    `gorm:"column:allowed_apps;type:text" json:"allowedApps"`
	QuizURL     string    `gorm:"column:quiz_url;size:1024" json:"quizUrl"`
	Status      string    `gorm:"column:status;size:16;not null;default:draft;index" json:"status"`
}

func (ExamRoom) TableName() string { return "exam_rooms" }

// ExamPaper — gói đề (1 PDF chính + tài nguyên kèm theo)
type ExamPaper struct {
	ID         uint   `gorm:"primaryKey" json:"id"`
	ExamRoomID uint   `gorm:"column:exam_room_id;not null;index" json:"examRoomId"`
	Title      string `gorm:"column:title;size:128;not null" json:"title"`
	PdfPath    string `gorm:"column:pdf_path;size:512;not null" json:"pdfPath"`
	SortOrder  int    `gorm:"column:sort_order;default:0" json:"sortOrder"`
}

func (ExamPaper) TableName() string { return "exam_papers" }

// ExamPaperResource — file tài nguyên kèm đề (đuôi bất kỳ)
type ExamPaperResource struct {
	ID          uint   `gorm:"primaryKey" json:"id"`
	ExamPaperID uint   `gorm:"column:exam_paper_id;not null;index" json:"examPaperId"`
	FilePath    string `gorm:"column:file_path;size:512;not null" json:"filePath"`
	FileName    string `gorm:"column:file_name;size:255;not null" json:"fileName"`
}

func (ExamPaperResource) TableName() string { return "exam_paper_resources" }

// ExamRoomStudent — sinh viên trong phòng thi
type ExamRoomStudent struct {
	ID               uint       `gorm:"primaryKey" json:"id"`
	ExamRoomID       uint       `gorm:"column:exam_room_id;not null;uniqueIndex:idx_exam_room_student,priority:1" json:"examRoomId"`
	StudentRkID      int64      `gorm:"column:student_rk_id;not null;uniqueIndex:idx_exam_room_student,priority:2" json:"studentRkId"`
	AssignedPaperID  *uint      `gorm:"column:assigned_paper_id;index" json:"assignedPaperId,omitempty"`
	PaperSentAt      *time.Time `gorm:"column:paper_sent_at" json:"paperSentAt,omitempty"`
	PaperScheduledAt *time.Time `gorm:"column:paper_scheduled_at;index" json:"paperScheduledAt,omitempty"`
}

func (ExamRoomStudent) TableName() string { return "exam_room_students" }

// ExamSubmission — bài nộp (zip folder) của sinh viên
type ExamSubmission struct {
	ID          uint      `gorm:"primaryKey" json:"id"`
	CreatedAt   time.Time `json:"createdAt"`
	ExamRoomID  uint      `gorm:"column:exam_room_id;not null;index" json:"examRoomId"`
	StudentRkID int64     `gorm:"column:student_rk_id;not null;index" json:"studentRkId"`
	FilePath    string    `gorm:"column:file_path;size:512;not null" json:"filePath"`
	FileName    string    `gorm:"column:file_name;size:255;not null" json:"fileName"`
}

func (ExamSubmission) TableName() string { return "exam_submissions" }