package api

import (
	"RenewCMS/api/handlers/activity"
	"RenewCMS/api/handlers/apikey"
	"RenewCMS/api/handlers/article"
	"RenewCMS/api/handlers/auth"
	"RenewCMS/api/handlers/author"
	"RenewCMS/api/handlers/frontend"
	"RenewCMS/api/handlers/imagevariant"
	"RenewCMS/api/handlers/media"
	"RenewCMS/api/handlers/settings"
	"RenewCMS/api/handlers/site"
	"RenewCMS/api/handlers/staticimages"
	"RenewCMS/api/handlers/update"
	"RenewCMS/api/handlers/user"
	"RenewCMS/api/middleware"
	"RenewCMS/internal/infrastructure/config"
	"encoding/json"
	"net/http"
	"time"

	"github.com/MadAppGang/httplog"
	"github.com/go-chi/chi/v5"
	chimiddleware "github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/cors"
	"github.com/go-chi/jwtauth/v5"
)

func enableLoggingIfDev(r *chi.Mux, routerName string, environment string) {
	if environment == "development" {
		r.Use(httplog.LoggerWithName(routerName))
	}
}

func GetHelloWorld(w http.ResponseWriter, _ *http.Request) {
	msg, _ := json.Marshal(map[string]string{"message": "Hello World"})
	_, _ = w.Write(msg)
}

const (
	apiKeyMaxRequests = 120
	apiKeyWindow      = time.Minute
)

func (c *UseCases) apiKeyAuth() func(http.Handler) http.Handler {
	c.apiKeyAuthOnce.Do(func() {
		c.apiKeyAuthMiddleware = middleware.APIKeyAuth(c.AuthenticateAPIKeyUseCase, apiKeyMaxRequests, apiKeyWindow)
	})
	return c.apiKeyAuthMiddleware
}

func NewArticleRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()
	r.Use(container.apiKeyAuth())
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))

	articleHandler := article.NewHandler(container.CreateArticleUseCase, container.GetArticleUseCase, container.ListArticlesUseCase, container.DeleteArticleUseCase, container.UpdateArticleUseCase, container.GetUserUseCase)

	r.Group(func(r chi.Router) {
		r.Get("/", articleHandler.ListArticles)
		r.Get("/{id}", articleHandler.GetArticle)
	})
	r.Group(func(r chi.Router) {
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
		r.Post("/", articleHandler.PostArticle)
		r.Delete("/{id}", articleHandler.DeleteArticle)
		r.Patch("/{id}", articleHandler.UpdateArticleBody)
		r.Patch("/{id}/publish", articleHandler.PublishArticle)
		r.Patch("/{id}/unpublish", articleHandler.UnpublishArticle)
	})
	return r
}

func NewAuthRouter(container *UseCases, isProduction bool, rateLimit config.AuthRateLimitSettings, trustedProxies []string) http.Handler {
	r := chi.NewRouter()
	r.Use(jwtauth.Verifier(container.Token))
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))

	loginHandler := auth.NewLoginHandler(container.Token, container.CreateUserUseCase, container.AuthenticateUserUseCase, isProduction)
	verificationHandler := auth.NewVerificationHandler(container.VerifyUserUseCase, container.CancelRegistrationUseCase, isProduction)
	meHandler := auth.NewMeHandler(container.GetUserUseCase, container.GetMyAuthorUseCase)
	passwordResetHandler := auth.NewPasswordResetHandler(container.RequestPasswordResetUseCase, container.ResetPasswordUseCase)
	acceptInviteHandler := auth.NewAcceptInviteHandler(container.GetInviteUseCase, container.AcceptInviteUseCase, container.Token, isProduction)

	r.Post("/register", loginHandler.Register)
	r.Get("/registration", loginHandler.RegistrationStatus)
	r.Group(func(r chi.Router) {
		r.Use(middleware.TrustedProxyRealIP(trustedProxies))
		r.Use(middleware.NewRateLimiter(rateLimit.MaxAttempts, rateLimit.Window))
		r.Post("/login", loginHandler.Login)
	})
	r.Post("/logout", loginHandler.Logout)
	r.Group(func(r chi.Router) {
		r.Use(middleware.TrustedProxyRealIP(trustedProxies))
		r.Use(middleware.NewRateLimiter(rateLimit.MaxAttempts, rateLimit.Window))
		r.Post("/password-reset", passwordResetHandler.RequestPasswordReset)
	})
	r.Post("/password-reset/confirm", passwordResetHandler.ResetPassword)
	r.Group(func(r chi.Router) {
		r.Use(middleware.TrustedProxyRealIP(trustedProxies))
		r.Use(middleware.NewRateLimiter(rateLimit.MaxAttempts, rateLimit.Window))
		r.Get("/invite", acceptInviteHandler.GetInvite)
		r.Post("/invite/accept", acceptInviteHandler.AcceptInvite)
	})
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireSession)
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Post("/verify", verificationHandler.Verify)
		r.Delete("/register", verificationHandler.CancelRegistration)
	})
	r.Group(func(r chi.Router) {
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(container.apiKeyAuth())
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Get("/me", meHandler.Me)
	})
	return r
}

func NewUserRouter(container *UseCases, rateLimit config.AuthRateLimitSettings, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	userHandler := user.NewHandler(container.UpdateUserProfileUseCase)
	inviteHandler := user.NewInviteHandler(container.CreateInviteUseCase, container.CancelInviteUseCase, container.RenewInviteUseCase, container.ListUsersAndInvitesUseCase)

	r.Use(jwtauth.Verifier(container.Token))
	r.Use(container.apiKeyAuth())
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
	r.Use(jwtauth.Authenticator(container.Token))
	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
	r.Patch("/me", userHandler.UpdateMe)
	r.Get("/", inviteHandler.ListUsers)
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireOwner(container.GetUserUseCase))
		r.Use(middleware.TrustedProxyRealIP(trustedProxies))
		r.Use(middleware.NewRateLimiter(rateLimit.MaxAttempts, rateLimit.Window))
		r.Post("/invite", inviteHandler.CreateInvite)
		r.Delete("/invite/{id}", inviteHandler.CancelInvite)
		r.Post("/invite/{id}/renew", inviteHandler.RenewInvite)
	})
	return r
}

func NewSettingsRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	settingsHandler := settings.NewHandler(container.GetSettingsUseCase, container.GetActivityRetentionUseCase, container.UpdateActivityRetentionUseCase)

	r.Group(func(r chi.Router) {
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(container.apiKeyAuth())
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
		r.Get("/", settingsHandler.GetSettings)
	})
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireSession)
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
		r.Use(middleware.RequireSignedIn)
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
		r.Use(middleware.RequireOwner(container.GetUserUseCase))
		r.Patch("/", settingsHandler.UpdateSettings)
	})
	return r
}

func NewSiteRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	siteHandler := site.NewHandler(container.ListSitesUseCase, container.CreateSiteUseCase, container.UpdateSiteUseCase, container.SetDefaultSiteUseCase, container.DeleteSiteUseCase)

	r.Group(func(r chi.Router) {
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(container.apiKeyAuth())
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
		r.Get("/", siteHandler.List)
	})
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireSession)
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
		r.Use(middleware.RequireSignedIn)
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
		r.Use(middleware.RequireOwner(container.GetUserUseCase))
		r.Post("/", siteHandler.Create)
		r.Patch("/{id}", siteHandler.Update)
		r.Patch("/{id}/default", siteHandler.SetDefault)
		r.Delete("/{id}", siteHandler.Delete)
	})
	return r
}

func NewAuthorRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	authorHandler := author.NewHandler(container.ListAuthorsUseCase, container.CreateAuthorUseCase, container.CreateMyAuthorUseCase, container.UpdateAuthorUseCase, container.DeleteAuthorUseCase, container.GetUserUseCase)

	r.Group(func(r chi.Router) {
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(container.apiKeyAuth())
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
		r.Get("/", authorHandler.List)
	})
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireSession)
		r.Use(jwtauth.Verifier(container.Token))
		r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
		r.Use(middleware.RequireSignedIn)
		r.Use(jwtauth.Authenticator(container.Token))
		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
		r.Post("/me", authorHandler.CreateMine)
		r.Patch("/{id}", authorHandler.Update)
		r.Group(func(r chi.Router) {
			r.Use(middleware.RequireOwnerOrAdmin(container.GetUserUseCase))
			r.Post("/", authorHandler.Create)
			r.Delete("/{id}", authorHandler.Delete)
		})
	})
	return r
}

func NewActivityRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	activityHandler := activity.NewHandler(container.ListActivityUseCase, container.GetActivitySummaryUseCase, container.ExportActivityUseCase)

	r.Use(middleware.RequireSession)
	r.Use(jwtauth.Verifier(container.Token))
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
	r.Use(middleware.RequireSignedIn)
	r.Use(jwtauth.Authenticator(container.Token))
	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
	r.Get("/", activityHandler.List)
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireOwnerOrAdmin(container.GetUserUseCase))
		r.Get("/summary", activityHandler.Summary)
		r.Get("/export", activityHandler.Export)
	})
	return r
}

const (
	updateCheckMaxAttempts    = 5
	updateCheckWindow         = time.Minute
	updateDownloadMaxAttempts = 5
	updateDownloadWindow      = time.Minute
)

func NewSystemRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	updateHandler := update.NewHandler(container.GetUpdateStatusUseCase, container.CheckForUpdateUseCase, container.StartUpdateDownloadUseCase, container.RequestRestartUseCase, container.GetUserUseCase)

	r.Use(middleware.RequireSession)
	r.Use(jwtauth.Verifier(container.Token))
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
	r.Use(jwtauth.Authenticator(container.Token))
	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
	r.Get("/update", updateHandler.GetStatus)
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireOwner(container.GetUserUseCase))
		r.Use(middleware.NewUserRateLimiter(updateCheckMaxAttempts, updateCheckWindow))
		r.Post("/update/check", updateHandler.Check)
	})
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireOwner(container.GetUserUseCase))
		r.Use(middleware.NewUserRateLimiter(updateDownloadMaxAttempts, updateDownloadWindow))
		r.Post("/update/download", updateHandler.Download)
	})
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireOwner(container.GetUserUseCase))
		r.Post("/update/restart", updateHandler.Restart)
	})
	return r
}

func NewAPIKeyRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	apiKeyHandler := apikey.NewHandler(container.CreateAPIKeyUseCase, container.ListAPIKeysUseCase, container.RevokeAPIKeyUseCase)

	r.Use(middleware.RequireSession)
	r.Use(jwtauth.Verifier(container.Token))
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
	r.Use(jwtauth.Authenticator(container.Token))
	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
	r.Post("/", apiKeyHandler.Create)
	r.Get("/", apiKeyHandler.List)
	r.Delete("/{id}", apiKeyHandler.Revoke)
	return r
}

func NewMediaRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	mediaHandler := media.NewHandler(container.CreateImageUseCase, container.ListMediaUseCase, container.RenameMediaUseCase, container.DeleteMediaUseCase, container.MergeMediaUseCase, container.GetMediaUsageUseCase, container.GetPurgeSettingsUseCase, container.UpdatePurgeSettingsUseCase, container.PreviewPurgeUseCase, container.RunPurgeUseCase, container.ListImageVariantsUseCase, container.GenerateImageVariantUseCase, container.GenerateAllImageVariantsUseCase, container.PurgeImageVariantUseCase, container.GenerateVariantsOnUploadUseCase)

	r.Use(jwtauth.Verifier(container.Token))
	r.Use(container.apiKeyAuth())
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
	r.Use(middleware.RequireSignedIn)
	r.Use(jwtauth.Authenticator(container.Token))
	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireOwnerOrAdmin(container.GetUserUseCase))
		r.Get("/purge-settings", mediaHandler.GetPurgeSettings)
		r.Patch("/purge-settings", mediaHandler.UpdatePurgeSettings)
		r.Get("/purge-preview", mediaHandler.PreviewPurge)
		r.Post("/purge", mediaHandler.RunPurge)
	})
	r.Group(func(r chi.Router) {
		r.Use(middleware.RejectAPIKey)
		r.Use(middleware.RequireOwnerOrAdmin(container.GetUserUseCase))
		r.Get("/{id}/variants", mediaHandler.ListVariants)
		r.Post("/{id}/variants", mediaHandler.GenerateAllVariants)
		r.Post("/{id}/variants/{name}", mediaHandler.GenerateVariant)
		r.Delete("/{id}/variants/{name}", mediaHandler.PurgeVariant)
	})
	r.Get("/", mediaHandler.List)
	r.Post("/", mediaHandler.Upload)
	r.Post("/merge", mediaHandler.Merge)
	r.Patch("/{id}", mediaHandler.Rename)
	r.Delete("/{id}", mediaHandler.Delete)
	r.Get("/{id}/usage", mediaHandler.Usage)
	return r
}

func NewImageVariantRouter(container *UseCases, trustedProxies []string) http.Handler {
	r := chi.NewRouter()

	variantHandler := imagevariant.NewHandler(container.ListVariantsUseCase, container.CreateVariantUseCase, container.UpdateVariantUseCase, container.SetVariantEnabledUseCase, container.DeleteVariantUseCase, container.PurgeVariantUseCase, container.GetVariantCacheStatsUseCase, container.PurgeVariantCacheUseCase)

	r.Use(jwtauth.Verifier(container.Token))
	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
	r.Use(middleware.RequireSignedIn)
	r.Use(jwtauth.Authenticator(container.Token))
	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
	r.Use(middleware.RequireOwnerOrAdmin(container.GetUserUseCase))
	r.Get("/", variantHandler.List)
	r.Post("/", variantHandler.Create)
	r.Get("/cache", variantHandler.CacheStats)
	r.Post("/cache/purge", variantHandler.PurgeCache)
	r.Put("/{name}", variantHandler.Update)
	r.Patch("/{name}", variantHandler.SetEnabled)
	r.Delete("/{name}", variantHandler.Delete)
	r.Post("/{name}/purge", variantHandler.Purge)
	return r
}

func InitBackendRoutes(container *UseCases, settings config.Settings) *chi.Mux {
	r := chi.NewRouter()

	enableLoggingIfDev(r, "backend", settings.Environment)

	r.Use(chimiddleware.GetHead)
	r.Use(middleware.JsonContentTypeMiddleware)
	r.Get("/", GetHelloWorld)
	r.Group(func(r chi.Router) {
		r.Use(jwtauth.Verifier(container.Token))
		r.Mount("/article", NewArticleRouter(container, settings.TrustedProxies))
	})
	r.Mount("/user", NewUserRouter(container, settings.AuthRateLimit, settings.TrustedProxies))
	r.Mount("/settings", NewSettingsRouter(container, settings.TrustedProxies))
	r.Mount("/site", NewSiteRouter(container, settings.TrustedProxies))
	r.Mount("/author", NewAuthorRouter(container, settings.TrustedProxies))
	r.Mount("/activity", NewActivityRouter(container, settings.TrustedProxies))
	r.Mount("/media", NewMediaRouter(container, settings.TrustedProxies))
	r.Mount("/image-variants", NewImageVariantRouter(container, settings.TrustedProxies))
	r.Mount("/api-key", NewAPIKeyRouter(container, settings.TrustedProxies))
	r.Mount("/system", NewSystemRouter(container, settings.TrustedProxies))
	r.Mount("/auth", NewAuthRouter(container, settings.IsProduction(), settings.AuthRateLimit, settings.TrustedProxies))

	return r
}

func InitFrontendRoutes(environment string) *chi.Mux {
	r := chi.NewRouter()

	enableLoggingIfDev(r, "frontend", environment)

	r.Mount("/", frontend.NewFrontendRouter())

	return r
}

func GetHealth(w http.ResponseWriter, _ *http.Request) {
	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	_, _ = w.Write([]byte("ok"))
}

func enableCorsIfConfigured(r *chi.Mux, origins []string) {
	if len(origins) == 0 {
		return
	}
	r.Use(cors.Handler(cors.Options{
		AllowedOrigins:   origins,
		AllowedMethods:   []string{"GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"},
		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
		ExposedHeaders:   []string{"Link"},
		AllowCredentials: false,
		MaxAge:           300,
	}))
}

func InitRoutes(container *UseCases, settings config.Settings) *chi.Mux {
	backend := InitBackendRoutes(container, settings)
	frontend := InitFrontendRoutes(settings.Environment)

	apiRouter := chi.NewRouter()
	apiRouter.Use(middleware.SecurityHeaders(settings.IsProduction()))
	enableCorsIfConfigured(apiRouter, settings.CorsAllowedOrigins)
	apiRouter.Use(chimiddleware.GetHead)
	apiRouter.Get("/healthz", GetHealth)
	apiRouter.Mount("/v1", backend)
	apiRouter.Mount("/static/uploadedImages", staticimages.NewHandler(container.OpenMediaUseCase, container.ServeVariantUseCase))
	apiRouter.Mount("/", frontend)

	return apiRouter
}