package milky

import (
	"cellbot/internal/engine"
	"cellbot/internal/protocol"
	"cellbot/pkg/net"
	"context"
	"fmt"
	"strconv"
	"time"

	"go.uber.org/zap"
)

// Config Milky 适配器配置
type Config struct {
	// 协议端地址（如 http://localhost:3000）
	ProtocolURL string `toml:"protocol_url"`
	// 访问令牌
	AccessToken string `toml:"access_token"`
	// 事件接收方式: sse, websocket, webhook
	EventMode string `toml:"event_mode"`
	// Webhook 监听地址（仅当 event_mode = "webhook" 时需要）
	WebhookListenAddr string `toml:"webhook_listen_addr"`
	// 超时时间（秒）
	Timeout int `toml:"timeout"`
	// 重试次数
	RetryCount int `toml:"retry_count"`
}

// Adapter Milky 协议适配器
type Adapter struct {
	config         *Config
	selfID         string
	apiClient      *APIClient
	sseClient      *net.SSEClient
	wsManager      *net.WebSocketManager
	wsConn         *net.WebSocketConnection
	webhookServer  *WebhookServer
	eventBus       *engine.EventBus
	eventConverter *EventConverter
	logger         *zap.Logger
	ctx            context.Context
	cancel         context.CancelFunc
}

// NewAdapter 创建 Milky 适配器
func NewAdapter(config *Config, selfID string, eventBus *engine.EventBus, wsManager *net.WebSocketManager, logger *zap.Logger) *Adapter {
	ctx, cancel := context.WithCancel(context.Background())

	timeout := time.Duration(config.Timeout) * time.Second
	if timeout == 0 {
		timeout = 30 * time.Second
	}

	retryCount := config.RetryCount
	if retryCount == 0 {
		retryCount = 3
	}

	return &Adapter{
		config:         config,
		selfID:         selfID,
		apiClient:      NewAPIClient(config.ProtocolURL, config.AccessToken, timeout, retryCount, logger),
		eventBus:       eventBus,
		wsManager:      wsManager,
		eventConverter: NewEventConverter(logger),
		logger:         logger.Named("milky-adapter"),
		ctx:            ctx,
		cancel:         cancel,
	}
}

// Connect 连接到协议端
func (a *Adapter) Connect(ctx context.Context) error {
	a.logger.Info("Connecting to Milky protocol server",
		zap.String("url", a.config.ProtocolURL),
		zap.String("event_mode", a.config.EventMode))

	// 根据配置选择事件接收方式
	switch a.config.EventMode {
	case "sse":
		return a.connectSSE(ctx)
	case "websocket":
		return a.connectWebSocket(ctx)
	case "webhook":
		return a.startWebhook()
	default:
		return fmt.Errorf("unknown event mode: %s", a.config.EventMode)
	}
}

// connectSSE 连接 SSE
func (a *Adapter) connectSSE(ctx context.Context) error {
	eventURL := a.config.ProtocolURL + "/event"

	// 创建 SSE 客户端配置
	sseConfig := net.SSEClientConfig{
		URL:            eventURL,
		AccessToken:    a.config.AccessToken,
		ReconnectDelay: 5 * time.Second,
		MaxReconnect:   -1,            // 无限重连
		EventFilter:    "milky_event", // 只接收 milky_event 类型
		BufferSize:     100,
	}

	a.sseClient = net.NewSSEClient(sseConfig, a.logger)

	// 启动 SSE 连接
	if err := a.sseClient.Connect(ctx); err != nil {
		return fmt.Errorf("failed to connect SSE: %w", err)
	}

	// 启动事件处理
	go a.handleEvents(a.sseClient.Events())

	a.logger.Info("SSE connection established")
	return nil
}

// connectWebSocket 连接 WebSocket
func (a *Adapter) connectWebSocket(ctx context.Context) error {
	// 构建 WebSocket URL
	eventURL := a.config.ProtocolURL + "/event"
	// 替换 http:// 为 ws://，https:// 为 wss://
	if len(eventURL) > 7 && eventURL[:7] == "http://" {
		eventURL = "ws://" + eventURL[7:]
	} else if len(eventURL) > 8 && eventURL[:8] == "https://" {
		eventURL = "wss://" + eventURL[8:]
	}

	// 添加 access_token 参数
	if a.config.AccessToken != "" {
		eventURL += "?access_token=" + a.config.AccessToken
	}

	a.logger.Info("Connecting to WebSocket", zap.String("url", eventURL))

	// 使用 WebSocketManager 建立连接
	conn, err := a.wsManager.Dial(eventURL, a.selfID)
	if err != nil {
		return fmt.Errorf("failed to dial WebSocket: %w", err)
	}

	a.wsConn = conn

	// 启动事件处理
	go a.handleWebSocketEvents()

	a.logger.Info("WebSocket connection established")
	return nil
}

// handleWebSocketEvents 处理 WebSocket 事件
func (a *Adapter) handleWebSocketEvents() {
	for {
		select {
		case <-a.ctx.Done():
			return
		default:
		}

		// 读取消息
		_, message, err := a.wsConn.Conn.ReadMessage()
		if err != nil {
			a.logger.Error("Failed to read WebSocket message", zap.Error(err))
			return
		}

		// 转换事件
		event, err := a.eventConverter.Convert(message)
		if err != nil {
			a.logger.Error("Failed to convert event", zap.Error(err))
			continue
		}

		// 发布到事件总线
		a.eventBus.Publish(event)
	}
}

// startWebhook 启动 Webhook 服务器
func (a *Adapter) startWebhook() error {
	if a.config.WebhookListenAddr == "" {
		return fmt.Errorf("webhook_listen_addr is required for webhook mode")
	}

	a.webhookServer = NewWebhookServer(a.config.WebhookListenAddr, a.logger)

	// 启动服务器
	if err := a.webhookServer.Start(); err != nil {
		return fmt.Errorf("failed to start webhook server: %w", err)
	}

	// 启动事件处理
	go a.handleEvents(a.webhookServer.Events())

	a.logger.Info("Webhook server started", zap.String("addr", a.config.WebhookListenAddr))
	return nil
}

// handleEvents 处理事件
func (a *Adapter) handleEvents(eventChan <-chan []byte) {
	for {
		select {
		case <-a.ctx.Done():
			return
		case rawEvent, ok := <-eventChan:
			if !ok {
				a.logger.Info("Event channel closed")
				return
			}

			// 转换事件
			event, err := a.eventConverter.Convert(rawEvent)
			if err != nil {
				a.logger.Error("Failed to convert event", zap.Error(err))
				continue
			}

			// 发布到事件总线
			a.eventBus.Publish(event)
		}
	}
}

// SendAction 发送动作
func (a *Adapter) SendAction(ctx context.Context, action protocol.Action) (map[string]interface{}, error) {
	// 调用 API
	resp, err := a.apiClient.Call(ctx, string(action.GetType()), action.GetParams())
	if err != nil {
		return nil, fmt.Errorf("failed to call API: %w", err)
	}

	return resp.Data, nil
}

// ParseMessage 解析消息
func (a *Adapter) ParseMessage(raw []byte) (protocol.Event, error) {
	return a.eventConverter.Convert(raw)
}

// Disconnect 断开连接
func (a *Adapter) Disconnect() error {
	a.logger.Info("Disconnecting from Milky protocol server")

	a.cancel()

	// 关闭各种连接
	if a.sseClient != nil {
		if err := a.sseClient.Close(); err != nil {
			a.logger.Error("Failed to close SSE client", zap.Error(err))
		}
	}

	if a.wsConn != nil {
		// WebSocket 连接会在 context 取消时自动关闭
		a.logger.Info("WebSocket connection will be closed")
	}

	if a.webhookServer != nil {
		if err := a.webhookServer.Stop(); err != nil {
			a.logger.Error("Failed to stop webhook server", zap.Error(err))
		}
	}

	if a.apiClient != nil {
		if err := a.apiClient.Close(); err != nil {
			a.logger.Error("Failed to close API client", zap.Error(err))
		}
	}

	return nil
}

// GetProtocolName 获取协议名称
func (a *Adapter) GetProtocolName() string {
	return "milky"
}

// GetProtocolVersion 获取协议版本
func (a *Adapter) GetProtocolVersion() string {
	return "1.0"
}

// GetSelfID 获取机器人自身 ID
func (a *Adapter) GetSelfID() string {
	return a.selfID
}

// IsConnected 是否已连接
func (a *Adapter) IsConnected() bool {
	switch a.config.EventMode {
	case "sse":
		return a.sseClient != nil
	case "websocket":
		return a.wsConn != nil && a.wsConn.Conn != nil
	case "webhook":
		return a.webhookServer != nil
	default:
		return false
	}
}

// GetStats 获取统计信息
func (a *Adapter) GetStats() map[string]interface{} {
	stats := map[string]interface{}{
		"protocol":   "milky",
		"self_id":    a.selfID,
		"event_mode": a.config.EventMode,
		"connected":  a.IsConnected(),
	}

	if a.config.EventMode == "websocket" && a.wsConn != nil {
		stats["remote_addr"] = a.wsConn.RemoteAddr
		stats["connection_type"] = a.wsConn.Type
	}

	return stats
}

// CallAPI 直接调用 API（提供给 Bot 使用）
func (a *Adapter) CallAPI(ctx context.Context, endpoint string, params map[string]interface{}) (*APIResponse, error) {
	return a.apiClient.Call(ctx, endpoint, params)
}

// GetConfig 获取配置
func (a *Adapter) GetConfig() *Config {
	return a.config
}

// SetSelfID 设置机器人自身 ID
func (a *Adapter) SetSelfID(selfID string) {
	a.selfID = selfID
}

// GetSelfIDInt64 获取机器人自身 ID（int64）
func (a *Adapter) GetSelfIDInt64() (int64, error) {
	return strconv.ParseInt(a.selfID, 10, 64)
}