package http

import (
	"context"
	"net/http"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/mark3labs/mcp-go/server"
	"github.com/rs/zerolog/log"

	"github.com/sjzar/chatlog/internal/chatlog/conf"
	"github.com/sjzar/chatlog/internal/chatlog/database"
	"github.com/sjzar/chatlog/internal/errors"
	"github.com/sjzar/chatlog/internal/whisper"
)

type Service struct {
	conf Config
	db   *database.Service

	router *gin.Engine
	server *http.Server

	mcpServer           *server.MCPServer
	mcpSSEServer        *server.SSEServer
	mcpStreamableServer *server.StreamableHTTPServer

	speechTranscriber whisper.Transcriber
	speechOptions     whisper.Options
}

type Config interface {
	GetHTTPAddr() string
	GetDataDir() string
	GetSpeech() *conf.SpeechConfig
}

func NewService(conf Config, db *database.Service) *Service {
	gin.SetMode(gin.ReleaseMode)
	router := gin.New()

	// Handle error from SetTrustedProxies
	if err := router.SetTrustedProxies(nil); err != nil {
		log.Err(err).Msg("Failed to set trusted proxies")
	}

	// Middleware
	router.Use(
		errors.RecoveryMiddleware(),
		errors.ErrorHandlerMiddleware(),
		gin.LoggerWithWriter(log.Logger, "/health"),
		corsMiddleware(),
	)

	s := &Service{
		conf:   conf,
		db:     db,
		router: router,
	}

	s.initMCPServer()
	s.initRouter()
	s.initSpeech(conf)
	return s
}

func (s *Service) initSpeech(cfg Config) {
	if s.speechTranscriber != nil {
		s.speechTranscriber.Close()
		s.speechTranscriber = nil
	}

	speechCfg := cfg.GetSpeech()
	if speechCfg == nil || !speechCfg.Enabled {
		return
	}

	speechCfg.Normalize()

	opts := speechCfg.ToOptions()
	timeout := time.Duration(speechCfg.RequestTimeoutSeconds) * time.Second

	provider := strings.ToLower(speechCfg.Provider)
	switch provider {
	case "openai":
		transcriber, err := whisper.NewOpenAITranscriber(whisper.OpenAIConfig{
			Model:          speechCfg.Model,
			TranslateModel: speechCfg.TranslateModel,
			APIKey:         speechCfg.APIKey,
			BaseURL:        speechCfg.BaseURL,
			Organization:   speechCfg.Organization,
			ProxyURL:       speechCfg.Proxy,
			RequestTimeout: timeout,
			DefaultOptions: opts,
		})
		if err != nil {
			log.Err(err).Msg("initialise openai whisper transcriber failed")
			return
		}
		s.speechTranscriber = transcriber
		s.speechOptions = opts
		log.Info().Str("model", transcriber.ModelName()).Msg("speech transcription backend initialised via openai whisper")
	case "webservice", "local", "docker", "http", "whisper-asr":
		transcriber, err := whisper.NewWebServiceTranscriber(whisper.WebServiceConfig{
			BaseURL:        speechCfg.ServiceURL,
			OutputFormat:   speechCfg.ServiceOutput,
			WordTimestamps: speechCfg.WordTimestamps,
			VADFilter:      speechCfg.VADFilter,
			RequestTimeout: timeout,
			DefaultOptions: opts,
		})
		if err != nil {
			log.Err(err).Msg("initialise webservice whisper transcriber failed")
			return
		}
		s.speechTranscriber = transcriber
		s.speechOptions = opts
		log.Info().Str("base_url", speechCfg.ServiceURL).Msg("speech transcription backend initialised via whisper webservice")
	case "whispercpp", "whisper.cpp", "cpp":
		modelPath := strings.TrimSpace(speechCfg.Model)
		transcriber, err := whisper.NewWhisperCPPTranscriber(whisper.WhisperCPPConfig{
			ModelPath:      modelPath,
			Threads:        speechCfg.Threads,
			DefaultOptions: opts,
		})
		if err != nil {
			log.Err(err).Msg("initialise whisper.cpp transcriber failed")
			return
		}
		s.speechTranscriber = transcriber
		s.speechOptions = opts
		log.Info().Str("model_path", modelPath).Msg("speech transcription backend initialised via whisper.cpp")
	default:
		log.Warn().Str("provider", speechCfg.Provider).Msg("unsupported speech provider; speech transcription disabled")
	}
}

func (s *Service) ReloadSpeech() {
	s.initSpeech(s.conf)
}

func (s *Service) Start() error {

	s.server = &http.Server{
		Addr:    s.conf.GetHTTPAddr(),
		Handler: s.router,
	}

	go func() {
		// Handle error from Run
		if err := s.server.ListenAndServe(); err != nil {
			log.Err(err).Msg("Failed to start HTTP server")
		}
	}()

	log.Info().Msg("Starting HTTP server on " + s.conf.GetHTTPAddr())

	return nil
}

func (s *Service) ListenAndServe() error {

	s.server = &http.Server{
		Addr:    s.conf.GetHTTPAddr(),
		Handler: s.router,
	}

	log.Info().Msg("Starting HTTP server on " + s.conf.GetHTTPAddr())
	return s.server.ListenAndServe()
}

func (s *Service) Stop() error {

	if s.server == nil {
		return nil
	}

	// 使用超时上下文优雅关闭
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()

	if err := s.server.Shutdown(ctx); err != nil {
		log.Debug().Err(err).Msg("Failed to shutdown HTTP server")
		return nil
	}

	if s.speechTranscriber != nil {
		s.speechTranscriber.Close()
		s.speechTranscriber = nil
	}

	log.Info().Msg("HTTP server stopped")
	return nil
}

func (s *Service) GetRouter() *gin.Engine {
	return s.router
}