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"
)

// ── Channel Types ───────────────────────────

const (
	ChannelTypeDirect  = "direct"  // 1:1 AI chat (legacy "chat")
	ChannelTypeGroup   = "group"   // multi-model conversation
	ChannelTypeChannel = "channel" // named, persistent, membered
)

// Channel represents a conversation channel (unified: chats + channels).
type Channel struct {
	BaseModel
	UserID       string  `json:"user_id" db:"user_id"`
	Title        string  `json:"title" db:"title"`
	Description  string  `json:"description,omitempty" db:"description"`
	Type         string  `json:"type" db:"type"`
	Model        string  `json:"model,omitempty" db:"model"`
	SystemPrompt string  `json:"system_prompt,omitempty" db:"system_prompt"`
	APIConfigID  *string `json:"api_config_id,omitempty" db:"api_config_id"`
	IsArchived   bool    `json:"is_archived" db:"is_archived"`
	IsPinned     bool    `json:"is_pinned" db:"is_pinned"`
	FolderID     *string `json:"folder_id,omitempty" db:"folder_id"`
}

// Message represents a message in a channel
type Message struct {
	BaseModel
	ChannelID       string  `json:"channel_id" db:"channel_id"`
	Role            string  `json:"role" db:"role"`
	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"`
	ParentID        *string `json:"parent_id,omitempty" db:"parent_id"`
	ParticipantType string  `json:"participant_type,omitempty" db:"participant_type"`
	ParticipantID   string  `json:"participant_id,omitempty" db:"participant_id"`
}

const (
	MessageRoleUser      = "user"
	MessageRoleAssistant = "assistant"
	MessageRoleSystem    = "system"
)

// ── Channel Members & Models ────────────────

type ChannelMember struct {
	ID         string    `json:"id" db:"id"`
	ChannelID  string    `json:"channel_id" db:"channel_id"`
	UserID     string    `json:"user_id" db:"user_id"`
	Role       string    `json:"role" db:"role"`
	JoinedAt   time.Time `json:"joined_at" db:"joined_at"`
	LastReadAt time.Time `json:"last_read_at" db:"last_read_at"`
}

type ChannelModel struct {
	ID           string `json:"id" db:"id"`
	ChannelID    string `json:"channel_id" db:"channel_id"`
	ModelID      string `json:"model_id" db:"model_id"`
	APIConfigID  string `json:"api_config_id,omitempty" db:"api_config_id"`
	DisplayName  string `json:"display_name,omitempty" db:"display_name"`
	SystemPrompt string `json:"system_prompt,omitempty" db:"system_prompt"`
	IsDefault    bool   `json:"is_default" db:"is_default"`
}

type ChannelCursor struct {
	ID           string    `json:"id" db:"id"`
	ChannelID    string    `json:"channel_id" db:"channel_id"`
	UserID       string    `json:"user_id" db:"user_id"`
	ActiveLeafID *string   `json:"active_leaf_id,omitempty" db:"active_leaf_id"`
	UpdatedAt    time.Time `json:"updated_at" db:"updated_at"`
}

// ── Organization ────────────────────────────

type Folder struct {
	BaseModel
	UserID   string  `json:"user_id" db:"user_id"`
	Name     string  `json:"name" db:"name"`
	ParentID *string `json:"parent_id,omitempty" db:"parent_id"`
}

type Project struct {
	BaseModel
	UserID      string `json:"user_id" db:"user_id"`
	Name        string `json:"name" db:"name"`
	Description string `json:"description,omitempty" db:"description"`
	Color       string `json:"color,omitempty" db:"color"`
}

// ── API Config ──────────────────────────────

type APIConfig struct {
	BaseModel
	UserID    string `json:"user_id" db:"user_id"`
	Name      string `json:"name" db:"name"`
	Provider  string `json:"provider" db:"provider"`
	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"`
}

// ── Notes (future Phase 2) ──────────────────

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"`
}

type KnowledgeBase struct {
	BaseModel
	UserID   string `json:"user_id" db:"user_id"`
	Name     string `json:"name" db:"name"`
	Source   string `json:"source" db:"source"`
	Settings string `json:"settings,omitempty" db:"settings"`
}

// ── Model Presets ──────────────────────────

const (
	PresetScopeGlobal   = "global"
	PresetScopeTeam     = "team"
	PresetScopePersonal = "personal"
)

type ModelPreset struct {
	BaseModel
	Name         string   `json:"name" db:"name"`
	Description  string   `json:"description" db:"description"`
	BaseModelID  string   `json:"base_model_id" db:"base_model_id"`
	APIConfigID  *string  `json:"api_config_id,omitempty" db:"api_config_id"`
	SystemPrompt string   `json:"system_prompt,omitempty" db:"system_prompt"`
	Temperature  *float64 `json:"temperature,omitempty" db:"temperature"`
	MaxTokens    *int     `json:"max_tokens,omitempty" db:"max_tokens"`
	ToolsEnabled string   `json:"tools_enabled,omitempty" db:"tools_enabled"` // JSON array
	Scope        string   `json:"scope" db:"scope"`
	TeamID       *string  `json:"team_id,omitempty" db:"team_id"`
	CreatedBy    string   `json:"created_by" db:"created_by"`
	IsShared     bool     `json:"is_shared" db:"is_shared"`
	IsActive     bool     `json:"is_active" db:"is_active"`
	Icon         string   `json:"icon,omitempty" db:"icon"`
}

// ── 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"`
}

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"`
}