package models

import (
	"time"
)

// BaseModel contains fields common to all models
type BaseModel struct {
	ID        string    `json:"id" db:"id"`
	CreatedAt time.Time `json:"created_at" db:"created_at"`
	UpdatedAt time.Time `json:"updated_at" db:"updated_at"`
}

// User represents a user in the system
type User struct {
	BaseModel
	Email        string    `json:"email" db:"email"`
	PasswordHash string    `json:"-" db:"password_hash"`
	Name         string    `json:"name" db:"name"`
	Role         string    `json:"role" db:"role"`
	LastLoginAt  *time.Time `json:"last_login_at,omitempty" db:"last_login_at"`
	IsActive     bool      `json:"is_active" db:"is_active"`
}

// UserRole constants
const (
	UserRoleUser  = "user"
	UserRoleAdmin = "admin"
)

// Chat represents a chat conversation
type Chat struct {
	BaseModel
	UserID      string    `json:"user_id" db:"user_id"`
	Title       string    `json:"title" db:"title"`
	Model       string    `json:"model" db:"model"`
	SystemPrompt string   `json:"system_prompt,omitempty" db:"system_prompt"`
	IsArchived  bool      `json:"is_archived" db:"is_archived"`
}

// Message represents a chat message
type Message struct {
	BaseModel
	ChatID      string    `json:"chat_id" db:"chat_id"`
	Role        string    `json:"role" db:"role"` // "user", "assistant", "system"
	Content     string    `json:"content" db:"content"`
	Tokens      int       `json:"tokens,omitempty" db:"tokens"`
	Model       string    `json:"model,omitempty" db:"model"`
	FinishReason string   `json:"finish_reason,omitempty" db:"finish_reason"`
}

// MessageRole constants
const (
	MessageRoleUser      = "user"
	MessageRoleAssistant = "assistant"
	MessageRoleSystem    = "system"
)

// APIConfig represents a configured API provider
type APIConfig struct {
	BaseModel
	UserID      string `json:"user_id" db:"user_id"`
	Name        string `json:"name" db:"name"`
	Provider    string `json:"provider" db:"provider"` // "openai", "anthropic", "google", etc.
	APIKey      string `json:"-" db:"api_key"`
	BaseURL     string `json:"base_url,omitempty" db:"base_url"`
	Model       string `json:"model" db:"model"`
	IsDefault   bool   `json:"is_default" db:"is_default"`
}

// Channel represents a chat channel
type Channel struct {
	BaseModel
	Name        string `json:"name" db:"name"`
	Description string `json:"description,omitempty" db:"description"`
	IsPrivate   bool   `json:"is_private" db:"is_private"`
	OwnerID     string `json:"owner_id" db:"owner_id"`
}

// ChannelMember represents a member of a channel
type ChannelMember struct {
	BaseModel
	ChannelID string `json:"channel_id" db:"channel_id"`
	UserID    string `json:"user_id" db:"user_id"`
	Role      string `json:"role" db:"role"` // "member", "moderator", "admin"
}

// ChannelMessage represents a message in a channel
type ChannelMessage struct {
	BaseModel
	ChannelID string `json:"channel_id" db:"channel_id"`
	UserID    string `json:"user_id" db:"user_id"`
	Content   string `json:"content" db:"content"`
	ParentID  string `json:"parent_id,omitempty" db:"parent_id"`
}

// Note represents a user note
type Note struct {
	BaseModel
	UserID    string `json:"user_id" db:"user_id"`
	Title     string `json:"title" db:"title"`
	Content   string `json:"content" db:"content"`
	Tags      []string `json:"tags,omitempty" db:"tags"`
	FolderID  string `json:"folder_id,omitempty" db:"folder_id"`
	IsShared  bool   `json:"is_shared" db:"is_shared"`
}

// KnowledgeBase represents a knowledge base collection
type KnowledgeBase struct {
	BaseModel
	UserID   string `json:"user_id" db:"user_id"`
	Name     string `json:"name" db:"name"`
	Source   string `json:"source" db:"source"` // "url", "file", "text"
	Settings string `json:"settings,omitempty" db:"settings"` // JSON settings
}

// Workflow represents a workflow definition
type Workflow struct {
	BaseModel
	UserID  string `json:"user_id" db:"user_id"`
	Name    string `json:"name" db:"name"`
	Steps   string `json:"steps" db:"steps"` // JSON array of steps
	Settings string `json:"settings,omitempty" db:"settings"`
	IsPublic bool  `json:"is_public" db:"is_public"`
}

// Settings represents user settings
type Settings struct {
	UserID           string `json:"user_id" db:"user_id"`
	Theme            string `json:"theme" db:"theme"`
	Language         string `json:"language" db:"language"`
	Model            string `json:"model" db:"model"`
	SystemPrompt     string `json:"system_prompt,omitempty" db:"system_prompt"`
	MaxTokens        int    `json:"max_tokens" db:"max_tokens"`
	Temperature      float64 `json:"temperature" db:"temperature"`
	DefaultAPIConfigID string `json:"default_api_config_id,omitempty" db:"default_api_config_id"`
}

// APIToken represents an API token for external access
type APIToken struct {
	BaseModel
	UserID    string    `json:"user_id" db:"user_id"`
	Name      string    `json:"name" db:"name"`
	Token     string    `json:"-" db:"token"`
	ExpiresAt time.Time `json:"expires_at,omitempty" db:"expires_at"`
	LastUsedAt *time.Time `json:"last_used_at,omitempty" db:"last_used_at"`
	IsActive  bool      `json:"is_active" db:"is_active"`
}