package panel

import (
	"context"
	"fmt"
	"net/http"

	"github.com/go-chi/chi/v5"
	chimiddleware "github.com/go-chi/chi/v5/middleware"

	"github.com/leolionad58/ticketbot/internal/config"
	"github.com/leolionad58/ticketbot/internal/db"
	panelauth "github.com/leolionad58/ticketbot/internal/panel/auth"
	"github.com/leolionad58/ticketbot/internal/panel/handlers"
)

// Server is the HTTP panel server.
type Server struct {
	http *http.Server
}

// NewServer builds the panel HTTP server with all routes wired up.
func NewServer(
	cfg config.PanelWebConfig,
	sqlDB *db.TicketRepo,
	adminRepo *db.PanelAdminRepo,
	sessionRepo *db.PanelSessionRepo,
	auditRepo *db.AuditLogRepo,
	panelRepo *db.PanelConfigRepo,
	convocRepo *db.ConvocationConfigRepo,
	convocPanelRepo *db.ConvocationPanelRepo,
	guildID string,
	bot BotService,
) *Server {
	authSvc := panelauth.NewService(adminRepo, sessionRepo, cfg.SessionTimeoutMinutes)
	authMw := panelauth.NewMiddleware(authSvc, adminRepo)

	oauthCfg := panelauth.NewOAuthConfig(
		cfg.OAuthClientID,
		cfg.OAuthClientSecret,
		cfg.BaseURL+"/oauth/callback",
	)

	rnd := handlers.NewRenderer(ParseTemplates)
	if bot != nil {
		rnd.SetBotStatus(bot.GetBotStatus)
	}

	loginH := &handlers.LoginHandler{
		Admins:   adminRepo,
		Auth:     authSvc,
		OAuthCfg: oauthCfg,
		Renderer: rnd,
	}
	authH := &handlers.AuthHandler{
		Admins:   adminRepo,
		Auth:     authSvc,
		AuditLog: auditRepo,
		Issuer:   "TicketBot",
		Renderer: rnd,
	}
	var getBotStatus func() handlers.BotStatus
	if bot != nil {
		getBotStatus = bot.GetBotStatus
	}
	dashH := &handlers.DashboardHandler{
		TicketRepo:   sqlDB,
		PanelRepo:    panelRepo,
		GetBotStatus: getBotStatus,
		Renderer:     rnd,
	}
	var discordInfo handlers.DiscordInfo
	if bot != nil {
		if di, ok := bot.(handlers.DiscordInfo); ok {
			discordInfo = di
		}
	}
	panelsH := &handlers.PanelsHandler{
		PanelRepo:   panelRepo,
		AuditLog:    auditRepo,
		BotService:  bot,
		DiscordInfo: discordInfo,
		Renderer:    rnd,
	}
	var convocBot handlers.ConvocBotService
	var convocInfo handlers.ConvocDiscordInfo
	if bot != nil {
		convocBot = bot
		if di, ok := bot.(handlers.ConvocDiscordInfo); ok {
			convocInfo = di
		}
	}
	convocH := &handlers.ConvocationsHandler{
		TicketRepo:      sqlDB,
		ConvocRepo:      convocRepo,
		ConvocPanelRepo: convocPanelRepo,
		GuildID:         guildID,
		BotService:      convocBot,
		DiscordInfo:     convocInfo,
		Renderer:        rnd,
	}
	transcriptsH := &handlers.TranscriptsHandler{
		TicketRepo:  sqlDB,
		Renderer:    rnd,
		DiscordInfo: discordInfo,
	}
	auditH := &handlers.AuditHandler{
		AuditRepo: auditRepo,
		Renderer:  rnd,
	}
	sessH := &handlers.SessionsHandler{
		SessionRepo: sessionRepo,
		AdminRepo:   adminRepo,
		AuditLog:    auditRepo,
		Renderer:    rnd,
	}

	r := chi.NewRouter()
	r.Use(chimiddleware.Recoverer)
	r.Use(securityHeaders)

	// Static files
	r.Handle("/static/*", http.StripPrefix("/static/", http.FileServer(StaticFS())))

	// Transcript view — served without CSP headers (must be outside securityHeaders group)
	r.Get("/transcripts/view/{id}", transcriptsH.HandleView)

	// Public auth routes
	r.Get("/login", loginH.HandleLogin)
	r.Get("/oauth/callback", loginH.HandleCallback)
	r.Get("/auth/password-setup", authH.HandlePasswordSetupGET)
	r.Post("/auth/password-setup", authH.HandlePasswordSetupPOST)
	r.Get("/auth/totp-setup", authH.HandleTOTPSetupGET)
	r.Post("/auth/totp-setup", authH.HandleTOTPSetupPOST)
	r.Get("/auth/verify", authH.HandleVerifyGET)
	r.Post("/auth/verify", authH.HandleVerifyPOST)
	r.Post("/auth/logout", authH.HandleLogout)

	// Protected routes
	r.Group(func(r chi.Router) {
		r.Use(authMw.RequireAuth)
		r.Get("/", dashH.Handle)

		// Panels CRUD
		r.Get("/panels", panelsH.HandleList)
		r.Get("/panels/new", panelsH.HandleNew)
		r.Post("/panels/new", panelsH.HandleCreate)
		r.Post("/panels/preview", panelsH.HandlePreview)
		r.Get("/panels/{id}/edit", panelsH.HandleEdit)
		r.Post("/panels/{id}/edit", panelsH.HandleUpdate)
		r.Post("/panels/{id}/delete", panelsH.HandleDelete)
		r.Post("/panels/{id}/duplicate", panelsH.HandleDuplicate)
		r.Post("/panels/{id}/types/reorder", panelsH.HandleReorderTypes)

		// Convocations
		r.Get("/convocations", convocH.HandleGET)
		r.Post("/convocations", convocH.HandlePOST)
		r.Post("/convocations/create", convocH.HandleCreate)
		r.Post("/convocations/panels/new", convocH.HandleCreatePanel)
		r.Post("/convocations/panels/{id}/send", convocH.HandleSendPanel)
		r.Post("/convocations/panels/{id}/delete", convocH.HandleDeletePanel)

		// Transcripts (list + download only; view is outside securityHeaders)
		r.Get("/transcripts", transcriptsH.HandleList)
		r.Get("/transcripts/download/{id}", transcriptsH.HandleDownload)

		// Audit log
		r.Get("/audit", auditH.HandleList)

		// Sessions (superadmin only)
		r.Group(func(r chi.Router) {
			r.Use(authMw.RequireSuperadmin)
			r.Get("/sessions", sessH.HandleList)
			r.Post("/sessions/{id}/revoke", sessH.HandleRevoke)
			r.Post("/sessions/revoke-all", sessH.HandleRevokeAll)
		})
	})

	addr := fmt.Sprintf(":%d", cfg.Port)
	return &Server{
		http: &http.Server{
			Addr:    addr,
			Handler: r,
		},
	}
}

// Start runs the HTTP server until ctx is cancelled.
func (s *Server) Start(ctx context.Context) error {
	errCh := make(chan error, 1)
	go func() { errCh <- s.http.ListenAndServe() }()
	select {
	case <-ctx.Done():
		return s.http.Shutdown(context.Background())
	case err := <-errCh:
		return err
	}
}

func securityHeaders(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Security-Policy",
			"default-src 'self'; script-src 'self' 'unsafe-inline' https://unpkg.com https://cdn.tailwindcss.com https://cdn.jsdelivr.net; "+
				"style-src 'self' 'unsafe-inline' https://cdn.tailwindcss.com; "+
				"img-src 'self' https://cdn.discordapp.com data:; frame-src 'self'")
		w.Header().Set("X-Content-Type-Options", "nosniff")
		w.Header().Set("X-Frame-Options", "DENY")
		w.Header().Set("X-XSS-Protection", "0")
		w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
		w.Header().Set("Permissions-Policy", "camera=(), microphone=(), geolocation=()")
		next.ServeHTTP(w, r)
	})
}