package server

import (
	"database/sql"
	"net/http"

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

	"git.unsupervised.ca/walkies/internal/auth"
	"git.unsupervised.ca/walkies/internal/checkin"
	"git.unsupervised.ca/walkies/internal/notification"
	"git.unsupervised.ca/walkies/internal/schedule"
	"git.unsupervised.ca/walkies/internal/server/middleware"
	"git.unsupervised.ca/walkies/internal/setup"
	"git.unsupervised.ca/walkies/internal/timeoff"
	"git.unsupervised.ca/walkies/internal/volunteer"
)

func New(db *sql.DB, jwtSecret string, staticDir string) http.Handler {
	authSvc := auth.NewService(db, jwtSecret)

	volunteerStore := volunteer.NewStore(db)
	volunteerHandler := volunteer.NewHandler(volunteerStore, authSvc)

	notificationStore := notification.NewStore(db)
	notificationHandler := notification.NewHandler(notificationStore)

	timeoffStore := timeoff.NewStore(db)

	scheduleStore := schedule.NewStore(db)
	scheduleHandler := schedule.NewHandler(scheduleStore, notificationStore, timeoffStore)

	timeoffHandler := timeoff.NewHandler(timeoffStore, notificationStore, volunteerStore)

	checkinStore := checkin.NewStore(db)
	checkinHandler := checkin.NewHandler(checkinStore)

	setupStore := setup.NewStore(db)
	setupHandler := setup.NewHandler(setupStore, authSvc)

	r := chi.NewRouter()
	r.Use(chimiddleware.Logger)
	r.Use(chimiddleware.Recoverer)
	r.Use(chimiddleware.RealIP)

	// API routes
	r.Route("/api/v1", func(r chi.Router) {
		// Public auth endpoints
		r.Post("/auth/login", volunteerHandler.Login)
		r.Post("/auth/activate", volunteerHandler.Activate)

		// Public setup endpoints (self-disabling once first user exists)
		r.Get("/setup/status", setupHandler.Status)
		r.Post("/setup/admin", setupHandler.CreateAdmin)

		// Protected routes
		r.Group(func(r chi.Router) {
			r.Use(middleware.Authenticate(authSvc))

			// Volunteers
			r.With(middleware.RequireAdmin).Post("/volunteers", volunteerHandler.Create)
			r.Get("/volunteers", volunteerHandler.List)
			r.Get("/volunteers/{id}", volunteerHandler.Get)
			r.Put("/volunteers/{id}", volunteerHandler.Update)
			r.With(middleware.RequireAdmin).Post("/volunteers/{id}/invite", volunteerHandler.ResendInvite)

			// Shift templates (admin only)
			r.Get("/shift-templates", scheduleHandler.ListTemplates)
			r.With(middleware.RequireAdmin).Post("/shift-templates", scheduleHandler.CreateTemplate)
			r.With(middleware.RequireAdmin).Put("/shift-templates/{id}", scheduleHandler.UpdateTemplate)
			r.With(middleware.RequireAdmin).Delete("/shift-templates/{id}", scheduleHandler.DeleteTemplate)

			// Shift instances
			r.Get("/shifts", scheduleHandler.ListInstances)
			r.With(middleware.RequireAdmin).Post("/shifts/generate", scheduleHandler.GenerateInstances)
			r.With(middleware.RequireAdmin).Post("/shifts/publish", scheduleHandler.PublishMonth)
			r.With(middleware.RequireAdmin).Post("/shifts/unpublish", scheduleHandler.UnpublishMonth)
			r.With(middleware.RequireAdmin).Put("/shifts/{id}", scheduleHandler.UpdateInstance)
			r.Post("/shifts/{id}/confirm", scheduleHandler.ConfirmShift)

			// Time off
			r.Get("/timeoff", timeoffHandler.List)
			r.Post("/timeoff", timeoffHandler.Create)
			r.Put("/timeoff/{id}", timeoffHandler.Update)
			r.Delete("/timeoff/{id}", timeoffHandler.Delete)
			r.With(middleware.RequireAdmin).Put("/timeoff/{id}/review", timeoffHandler.Review)
			r.With(middleware.RequireAdmin).Get("/timeoff/{id}/shifts", timeoffHandler.RemovedShifts)

			// Check-in / check-out
			r.Post("/checkin", checkinHandler.CheckIn)
			r.Post("/checkout", checkinHandler.CheckOut)
			r.Get("/checkin/history", checkinHandler.History)

			// Notifications
			r.Get("/notifications", notificationHandler.List)
			r.Put("/notifications/{id}/read", notificationHandler.MarkRead)
		})
	})

	// Serve static React app for all other routes, with SPA fallback
	r.Handle("/*", spaHandler(staticDir))

	return r
}

// spaHandler serves static files from dir, falling back to index.html for
// paths that don't match a file on disk (so client-side routing works).
func spaHandler(dir string) http.HandlerFunc {
	fs := http.Dir(dir)
	fileServer := http.FileServer(fs)
	return func(w http.ResponseWriter, r *http.Request) {
		// Try to open the requested path as a static file.
		if f, err := fs.Open(r.URL.Path); err == nil {
			f.Close()
			fileServer.ServeHTTP(w, r)
			return
		}
		// Not a real file — serve index.html and let React Router handle it.
		http.ServeFile(w, r, dir+"/index.html")
	}
}