package server

import (
	"context"
	"embed"
	"fmt"
	"io/fs"
	"net/http"
	"sync"
	"time"

	"git.mchus.pro/mchus/logpile/internal/collector"
	"git.mchus.pro/mchus/logpile/internal/models"
)

// WebFS holds embedded web files (set by main package)
var WebFS embed.FS

type Config struct {
	Port        int
	PreloadFile string
	AppVersion  string
	AppCommit   string
}

type Server struct {
	config     Config
	mux        *http.ServeMux
	httpServer *http.Server

	mu             sync.RWMutex
	result         *models.AnalysisResult
	detectedVendor string
	rawExport      *RawExportPackage
	convertJobs    map[string]struct{}
	convertOutput  map[string]ConvertArtifact

	jobManager *JobManager
	collectors *collector.Registry
}

type ConvertArtifact struct {
	Path    string
	Summary string
}

func New(cfg Config) *Server {
	s := &Server{
		config:        cfg,
		mux:           http.NewServeMux(),
		jobManager:    NewJobManager(),
		collectors:    collector.NewDefaultRegistry(),
		convertJobs:   make(map[string]struct{}),
		convertOutput: make(map[string]ConvertArtifact),
	}
	s.setupRoutes()
	return s
}

func (s *Server) setupRoutes() {
	// Static files
	staticContent, err := fs.Sub(WebFS, "static")
	if err != nil {
		panic(err)
	}
	s.mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticContent))))

	// Pages
	s.mux.HandleFunc("/", s.handleIndex)

	// API endpoints
	s.mux.HandleFunc("POST /api/upload", s.handleUpload)
	s.mux.HandleFunc("GET /api/status", s.handleGetStatus)
	s.mux.HandleFunc("GET /api/parsers", s.handleGetParsers)
	s.mux.HandleFunc("GET /api/file-types", s.handleGetFileTypes)
	s.mux.HandleFunc("GET /api/events", s.handleGetEvents)
	s.mux.HandleFunc("GET /api/sensors", s.handleGetSensors)
	s.mux.HandleFunc("GET /api/config", s.handleGetConfig)
	s.mux.HandleFunc("GET /api/serials", s.handleGetSerials)
	s.mux.HandleFunc("GET /api/firmware", s.handleGetFirmware)
	s.mux.HandleFunc("GET /api/parse-errors", s.handleGetParseErrors)
	s.mux.HandleFunc("GET /api/export/csv", s.handleExportCSV)
	s.mux.HandleFunc("GET /api/export/json", s.handleExportJSON)
	s.mux.HandleFunc("GET /api/export/reanimator", s.handleExportReanimator)
	s.mux.HandleFunc("POST /api/convert", s.handleConvertReanimatorBatch)
	s.mux.HandleFunc("GET /api/convert/{id}", s.handleConvertStatus)
	s.mux.HandleFunc("GET /api/convert/{id}/download", s.handleConvertDownload)
	s.mux.HandleFunc("DELETE /api/clear", s.handleClear)
	s.mux.HandleFunc("POST /api/shutdown", s.handleShutdown)
	s.mux.HandleFunc("POST /api/collect", s.handleCollectStart)
	s.mux.HandleFunc("GET /api/collect/{id}", s.handleCollectStatus)
	s.mux.HandleFunc("POST /api/collect/{id}/cancel", s.handleCollectCancel)
}

func (s *Server) Run() error {
	addr := fmt.Sprintf(":%d", s.config.Port)
	s.httpServer = &http.Server{
		Addr:    addr,
		Handler: s.mux,
	}
	return s.httpServer.ListenAndServe()
}

// Shutdown gracefully shuts down the server
func (s *Server) Shutdown() {
	if s.httpServer != nil {
		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
		defer cancel()
		s.httpServer.Shutdown(ctx)
	}
}

// SetResult sets the analysis result (thread-safe)
func (s *Server) SetResult(result *models.AnalysisResult) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.result = result
}

// GetResult returns the analysis result (thread-safe)
func (s *Server) GetResult() *models.AnalysisResult {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.result
}

func (s *Server) SetRawExport(pkg *RawExportPackage) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.rawExport = pkg
}

func (s *Server) GetRawExport() *RawExportPackage {
	s.mu.RLock()
	defer s.mu.RUnlock()
	if s.rawExport == nil {
		return nil
	}
	cloned := *s.rawExport
	return &cloned
}

func (s *Server) ClientVersionString() string {
	s.mu.RLock()
	defer s.mu.RUnlock()
	v := s.config.AppVersion
	c := s.config.AppCommit
	if v == "" {
		v = "dev"
	}
	if c == "" {
		c = "none"
	}
	return fmt.Sprintf("LOGPile %s (commit: %s)", v, c)
}

// SetDetectedVendor sets the detected vendor name
func (s *Server) SetDetectedVendor(vendor string) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.detectedVendor = vendor
}

// GetDetectedVendor returns the detected vendor name
func (s *Server) GetDetectedVendor() string {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.detectedVendor
}

func (s *Server) markConvertJob(id string) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.convertJobs[id] = struct{}{}
}

func (s *Server) isConvertJob(id string) bool {
	s.mu.RLock()
	defer s.mu.RUnlock()
	_, ok := s.convertJobs[id]
	return ok
}

func (s *Server) setConvertArtifact(id string, artifact ConvertArtifact) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.convertOutput[id] = artifact
}

func (s *Server) getConvertArtifact(id string) (ConvertArtifact, bool) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	artifact, ok := s.convertOutput[id]
	return artifact, ok
}

func (s *Server) clearConvertArtifact(id string) {
	s.mu.Lock()
	defer s.mu.Unlock()
	delete(s.convertOutput, id)
}

func (s *Server) clearAllConvertArtifacts() []ConvertArtifact {
	s.mu.Lock()
	defer s.mu.Unlock()
	out := make([]ConvertArtifact, 0, len(s.convertOutput))
	for _, artifact := range s.convertOutput {
		out = append(out, artifact)
	}
	s.convertOutput = make(map[string]ConvertArtifact)
	s.convertJobs = make(map[string]struct{})
	return out
}