package server

import (
	"net/http"
	"time"

	sentryhttp "github.com/getsentry/sentry-go/http"
	"github.com/go-chi/chi"
	"github.com/go-chi/chi/middleware"
	"github.com/prometheus/client_golang/prometheus/promhttp"
	"sneak.berlin/go/webhooker/static"
)

// maxFormBodySize is the maximum allowed request body size (in
// bytes) for form POST endpoints. 1 MB is generous for any form
// submission while preventing abuse from oversized payloads.
const maxFormBodySize int64 = 1 * 1024 * 1024 // 1 MB

// requestTimeout is the maximum time allowed for a single HTTP
// request.
const requestTimeout = 60 * time.Second

// SetupRoutes configures all HTTP routes and middleware on the
// server's router.
func (s *Server) SetupRoutes() {
	s.router = chi.NewRouter()
	s.setupGlobalMiddleware()
	s.setupRoutes()
}

func (s *Server) setupGlobalMiddleware() {
	s.router.Use(middleware.Recoverer)
	s.router.Use(middleware.RequestID)
	s.router.Use(s.mw.SecurityHeaders())
	s.router.Use(s.mw.Logging())

	// Metrics middleware (only if credentials are configured)
	if s.params.Config.MetricsUsername != "" {
		s.router.Use(s.mw.Metrics())
	}

	s.router.Use(s.mw.CORS())
	s.router.Use(middleware.Timeout(requestTimeout))

	// Sentry error reporting (if SENTRY_DSN is set). Repanic is
	// true so panics still bubble up to the Recoverer middleware.
	if s.sentryEnabled {
		sentryHandler := sentryhttp.New(sentryhttp.Options{
			Repanic: true,
		})
		s.router.Use(sentryHandler.Handle)
	}
}

func (s *Server) setupRoutes() {
	s.router.Get("/", s.h.HandleIndex())

	s.router.Mount(
		"/s",
		http.StripPrefix("/s", http.FileServer(http.FS(static.Static))),
	)

	s.router.Route("/api/v1", func(_ chi.Router) {
		// API routes will be added here.
	})

	s.router.Get(
		"/.well-known/healthcheck",
		s.h.HandleHealthCheck(),
	)

	// set up authenticated /metrics route:
	if s.params.Config.MetricsUsername != "" {
		s.router.Group(func(r chi.Router) {
			r.Use(s.mw.MetricsAuth())
			r.Get(
				"/metrics",
				http.HandlerFunc(
					promhttp.Handler().ServeHTTP,
				),
			)
		})
	}

	s.setupPageRoutes()
	s.setupUserRoutes()
	s.setupSourceRoutes()
	s.setupWebhookRoutes()
}

func (s *Server) setupPageRoutes() {
	s.router.Route("/pages", func(r chi.Router) {
		r.Use(s.mw.CSRF())
		r.Use(s.mw.MaxBodySize(maxFormBodySize))

		r.Group(func(r chi.Router) {
			r.Use(s.mw.LoginRateLimit())
			r.Get("/login", s.h.HandleLoginPage())
			r.Post("/login", s.h.HandleLoginSubmit())
		})

		r.Post("/logout", s.h.HandleLogout())
	})
}

func (s *Server) setupUserRoutes() {
	s.router.Route("/user/{username}", func(r chi.Router) {
		r.Use(s.mw.CSRF())
		r.Get("/", s.h.HandleProfile())
	})
}

func (s *Server) setupSourceRoutes() {
	s.router.Route("/sources", func(r chi.Router) {
		r.Use(s.mw.CSRF())
		r.Use(s.mw.RequireAuth())
		r.Use(s.mw.MaxBodySize(maxFormBodySize))
		r.Get("/", s.h.HandleSourceList())
		r.Get("/new", s.h.HandleSourceCreate())
		r.Post("/new", s.h.HandleSourceCreateSubmit())
	})

	s.router.Route("/source/{sourceID}", func(r chi.Router) {
		r.Use(s.mw.CSRF())
		r.Use(s.mw.RequireAuth())
		r.Use(s.mw.MaxBodySize(maxFormBodySize))
		r.Get("/", s.h.HandleSourceDetail())
		r.Get("/edit", s.h.HandleSourceEdit())
		r.Post("/edit", s.h.HandleSourceEditSubmit())
		r.Post("/delete", s.h.HandleSourceDelete())
		r.Get("/logs", s.h.HandleSourceLogs())
		r.Post(
			"/entrypoints",
			s.h.HandleEntrypointCreate(),
		)
		r.Post(
			"/entrypoints/{entrypointID}/delete",
			s.h.HandleEntrypointDelete(),
		)
		r.Post(
			"/entrypoints/{entrypointID}/toggle",
			s.h.HandleEntrypointToggle(),
		)
		r.Post("/targets", s.h.HandleTargetCreate())
		r.Post(
			"/targets/{targetID}/delete",
			s.h.HandleTargetDelete(),
		)
		r.Post(
			"/targets/{targetID}/toggle",
			s.h.HandleTargetToggle(),
		)
	})
}

func (s *Server) setupWebhookRoutes() {
	s.router.HandleFunc(
		"/webhook/{uuid}",
		s.h.HandleWebhook(),
	)
}