// Package bridge provides multi-platform message bridging for Cyrene.
// It defines unified message types and adapter interfaces for QQ, Telegram, Discord, and Webhook.
package bridge

import (
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
)

// UnifiedMessage is the internal representation of a message from any platform.
type UnifiedMessage struct {
	ID          string       `json:"id"`
	Platform    string       `json:"platform"`     // "qq" | "telegram" | "discord" | "webhook"
	Source      string       `json:"source"`        // Group ID or user ID
	SenderID    string       `json:"sender_id"`     // Platform-specific sender ID
	SenderName  string       `json:"sender_name"`   // Display name
	Content     string       `json:"content"`
	IsAtBot     bool         `json:"is_at_bot"`     // Whether @bot was used
	IsDM        bool         `json:"is_dm"`         // Private message
	IsAdmin     bool         `json:"is_admin"`      // Sender is admin
	Attachments []Attachment `json:"attachments,omitempty"`
	RawData     any          `json:"raw_data,omitempty"` // Platform-specific raw payload
	Timestamp   time.Time    `json:"timestamp"`
}

// Attachment represents a file, image, or voice attachment.
type Attachment struct {
	Type string `json:"type"` // "image" | "file" | "voice" | "video"
	URL  string `json:"url"`
	Mime string `json:"mime,omitempty"`
	Size int64  `json:"size,omitempty"`
}

// SendOptions controls how a message is sent to a platform.
type SendOptions struct {
	ReplyTo   string        // Message ID to reply to
	MaxLength int           // Max content length (default 500 for group chats)
	MinGap    time.Duration // Min interval between messages (default 3s for QQ groups)
}

// Adapter is the interface for all platform adapters.
type Adapter interface {
	// Name returns the unique adapter identifier (e.g. "qq-main", "telegram-bot")
	Name() string

	// Platform returns the platform type: "qq", "telegram", "discord", "webhook"
	Platform() string

	// Start begins listening for messages (WebSocket connect / long polling / HTTP server)
	Start() error

	// Stop shuts down the adapter
	Stop() error

	// Send delivers a message to the platform
	Send(target string, content string, opts SendOptions) error

	// Incoming returns the channel of incoming messages from this adapter
	Incoming() <-chan *UnifiedMessage

	// IsConnected returns whether the adapter is currently connected
	IsConnected() bool
}

// Router matches incoming messages to the AI pipeline and routes responses back.
type Router struct {
	adapters map[string]Adapter
	onMessage func(msg *UnifiedMessage) // Called when a message should be sent to AI-Core
}

// NewRouter creates a new bridge router.
func NewRouter() *Router {
	return &Router{adapters: make(map[string]Adapter)}
}

// Register adds an adapter to the router.
func (r *Router) Register(a Adapter) {
	r.adapters[a.Name()] = a
}

// SetMessageHandler sets the callback for incoming messages.
func (r *Router) SetMessageHandler(fn func(*UnifiedMessage)) {
	r.onMessage = fn
}

// StartAll starts all registered adapters.
func (r *Router) StartAll() {
	for name, a := range r.adapters {
		go func(name string, a Adapter) {
			if err := a.Start(); err != nil {
				logger.Info("[bridge]", name, "start error:", err.Error())
				return
			}
			for msg := range a.Incoming() {
				if r.onMessage != nil {
					r.onMessage(msg)
				}
			}
		}(name, a)
	}
}

// StopAll stops all adapters.
func (r *Router) StopAll() {
	for _, a := range r.adapters {
		a.Stop()
	}
}

// SendTo routes a response message to the appropriate adapter.
func (r *Router) SendTo(platform, target, content string, opts SendOptions) error {
	for _, a := range r.adapters {
		if a.Platform() == platform {
			return a.Send(target, content, opts)
		}
	}
	return nil
}

// GroupChatRules defines the behavior constraints for group chat interactions.
type GroupChatRules struct {
	MaxLength         int           // Max characters per message
	MinGap            time.Duration // Min interval between messages
	MaxPerRound       int           // Max messages per conversation round
	SilenceKeywords   []string      // Keywords that trigger silence mode ("闭嘴", "别说话")
	AmbientMode       bool          // Whether to use ambient/审查 mode (reply only when mentioned or LLM decides)
}

// DefaultGroupRules returns sensible defaults for QQ group chats.
func DefaultGroupRules() GroupChatRules {
	return GroupChatRules{
		MaxLength:       500,
		MinGap:          3 * time.Second,
		MaxPerRound:     2,
		SilenceKeywords: []string{"闭嘴", "别说话", "别说了", "安静", "shut up", "stop"},
		AmbientMode:     true,
	}
}