package model

import (
	"encoding/json"
	"time"
)

// User represents a system user
type User struct {
	ID        string     `json:"id"`
	Email     string     `json:"email"`
	Name      string     `json:"name"`
	Role      string     `json:"role"` // admin, user
	AvatarURL *string    `json:"avatar_url,omitempty"`
	CreatedAt time.Time  `json:"created_at"`
	LastLogin *time.Time `json:"last_login,omitempty"`
	IsActive  bool       `json:"is_active"`
}

// Entry represents any content in the system (deal room, document, note, etc.)
type Entry struct {
	ID          string          `json:"id"`
	ParentID    *string         `json:"parent_id,omitempty"`
	DealRoomID  string          `json:"deal_room_id"`
	EntryType   string          `json:"entry_type"`
	Title       string          `json:"title"`
	Content     json.RawMessage `json:"content"`
	FilePath    *string         `json:"file_path,omitempty"`
	FileSize    *int64          `json:"file_size,omitempty"`
	FileHash    *string         `json:"file_hash,omitempty"`
	Embedding   []byte          `json:"-"` // Not included in JSON output
	CreatedBy   string          `json:"created_by"`
	CreatedAt   time.Time       `json:"created_at"`
	UpdatedAt   time.Time       `json:"updated_at"`
}

// Access represents RBAC permissions for entries
type Access struct {
	ID          string    `json:"id"`
	EntryID     string    `json:"entry_id"`
	UserID      string    `json:"user_id"`
	Permissions int       `json:"permissions"` // Bitmask: read=1, write=2, delete=4, manage=8
	GrantedBy   string    `json:"granted_by"`
	GrantedAt   time.Time `json:"granted_at"`
}

// Permission constants
const (
	PermissionRead   = 1
	PermissionWrite  = 2
	PermissionDelete = 4
	PermissionManage = 8
)

// HasPermission checks if access includes the given permission
func (a *Access) HasPermission(permission int) bool {
	return a.Permissions&permission != 0
}

// Session represents a user session
type Session struct {
	Token     string     `json:"token"`
	UserID    string     `json:"user_id"`
	ExpiresAt time.Time  `json:"expires_at"`
	CreatedAt time.Time  `json:"created_at"`
	LastUsed  time.Time  `json:"last_used"`
	UserAgent *string    `json:"user_agent,omitempty"`
	IPAddress *string    `json:"ip_address,omitempty"`
}

// IsExpired checks if the session has expired
func (s *Session) IsExpired() bool {
	return time.Now().After(s.ExpiresAt)
}

// AuditLog represents an audit trail entry
type AuditLog struct {
	ID        string          `json:"id"`
	UserID    *string         `json:"user_id,omitempty"`
	EntryID   *string         `json:"entry_id,omitempty"`
	Action    string          `json:"action"`
	Details   json.RawMessage `json:"details,omitempty"`
	IPAddress *string         `json:"ip_address,omitempty"`
	UserAgent *string         `json:"user_agent,omitempty"`
	CreatedAt time.Time       `json:"created_at"`
}

// Deal Room specific content types

// DealRoomContent represents the content structure for deal room entries
type DealRoomContent struct {
	Type                string                 `json:"type"`
	Description         string                 `json:"description"`
	Stage               string                 `json:"stage"` // sourcing, loi, due_diligence, closing, completed
	TargetCompany       string                 `json:"target_company"`
	DealValue           string                 `json:"deal_value"`
	Participants        []DealParticipant      `json:"participants"`
	KeyDates            map[string]string      `json:"key_dates"`
	ConfidentialityLevel string                 `json:"confidentiality_level"`
}

type DealParticipant struct {
	Name         string `json:"name"`
	Role         string `json:"role"`
	Organization string `json:"organization"`
}

// DocumentContent represents the content structure for document entries
type DocumentContent struct {
	Type         string            `json:"type"`
	Category     string            `json:"category"` // nda, cim, financial_model, teaser, legal, dd_report
	MimeType     string            `json:"mime_type"`
	OriginalName string            `json:"original_name"`
	Version      string            `json:"version"`
	Analysis     *DocumentAnalysis `json:"analysis,omitempty"`
	RequiresNDA  bool              `json:"requires_nda"`
}

type DocumentAnalysis struct {
	Summary      string   `json:"summary"`
	KeyMetrics   []string `json:"key_metrics"`
	RiskFactors  []string `json:"risk_factors"`
	AIConfidence float64  `json:"ai_confidence"`
}

// NoteContent represents the content structure for note/message entries
type NoteContent struct {
	Type          string   `json:"type"`
	Body          string   `json:"body"`
	Mentions      []string `json:"mentions"` // User IDs mentioned with @
	Attachments   []string `json:"attachments"` // Entry IDs referenced
	ThreadContext string   `json:"thread_context"` // Context for organizing conversations
}

// ActivityItem represents an item in the activity feed
type ActivityItem struct {
	ID        string          `json:"id"`
	UserID    string          `json:"user_id"`
	UserName  string          `json:"user_name"`
	Action    string          `json:"action"`
	EntryID   string          `json:"entry_id"`
	EntryType string          `json:"entry_type"`
	Title     string          `json:"title"`
	Details   json.RawMessage `json:"details,omitempty"`
	CreatedAt time.Time       `json:"created_at"`
}