// @title datarhei Core API
// @version 3.0
// @description Expose REST API for the datarhei Core

// @contact.name datarhei Core Support
// @contact.url https://www.datarhei.com
// @contact.email hello@datarhei.com

// @license.name Apache 2.0
// @license.url https://github.com/datarhei/core/v16/blob/main/LICENSE

// @BasePath /

// @securityDefinitions.apikey ApiKeyAuth
// @in header
// @name Authorization
// @Param Authorization header string true "Insert your access token" default(Bearer <Add access token here>)

// @securityDefinitions.apikey ApiRefreshKeyAuth
// @in header
// @name Authorization

// @securityDefinitions.apikey Auth0KeyAuth
// @in header
// @name Authorization

// @securityDefinitions.basic BasicAuth

package http

import (
	"net/http"
	"strings"

	"github.com/datarhei/core/v16/config"
	"github.com/datarhei/core/v16/http/cache"
	"github.com/datarhei/core/v16/http/errorhandler"
	"github.com/datarhei/core/v16/http/graph/resolver"
	"github.com/datarhei/core/v16/http/handler"
	api "github.com/datarhei/core/v16/http/handler/api"
	"github.com/datarhei/core/v16/http/jwt"
	"github.com/datarhei/core/v16/http/router"
	"github.com/datarhei/core/v16/http/validator"
	"github.com/datarhei/core/v16/io/fs"
	"github.com/datarhei/core/v16/log"
	"github.com/datarhei/core/v16/monitor"
	"github.com/datarhei/core/v16/net"
	"github.com/datarhei/core/v16/prometheus"
	"github.com/datarhei/core/v16/restream"
	"github.com/datarhei/core/v16/rtmp"
	"github.com/datarhei/core/v16/session"
	"github.com/datarhei/core/v16/srt"

	mwcache "github.com/datarhei/core/v16/http/middleware/cache"
	mwcors "github.com/datarhei/core/v16/http/middleware/cors"
	mwgzip "github.com/datarhei/core/v16/http/middleware/gzip"
	mwhlsrewrite "github.com/datarhei/core/v16/http/middleware/hlsrewrite"
	mwiplimit "github.com/datarhei/core/v16/http/middleware/iplimit"
	mwlog "github.com/datarhei/core/v16/http/middleware/log"
	mwmime "github.com/datarhei/core/v16/http/middleware/mime"
	mwredirect "github.com/datarhei/core/v16/http/middleware/redirect"
	mwsession "github.com/datarhei/core/v16/http/middleware/session"

	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"

	echoSwagger "github.com/swaggo/echo-swagger" // echo-swagger middleware

	// Expose the API docs
	_ "github.com/datarhei/core/v16/docs"
)

var ListenAndServe = http.ListenAndServe

type Config struct {
	Logger        log.Logger
	LogBuffer     log.BufferWriter
	Restream      restream.Restreamer
	Metrics       monitor.HistoryReader
	Prometheus    prometheus.Reader
	MimeTypesFile string
	DiskFS        fs.Filesystem
	MemFS         MemFSConfig
	IPLimiter     net.IPLimiter
	Profiling     bool
	Cors          CorsConfig
	RTMP          rtmp.Server
	SRT           srt.Server
	JWT           jwt.JWT
	Config        config.Store
	Cache         cache.Cacher
	Sessions      session.RegistryReader
	Router        router.Router
	ReadOnly      bool
}

type MemFSConfig struct {
	EnableAuth bool
	Username   string
	Password   string
	Filesystem fs.Filesystem
}

type CorsConfig struct {
	Origins []string
}

type Server interface {
	ServeHTTP(w http.ResponseWriter, r *http.Request)
}

type server struct {
	logger log.Logger

	handler struct {
		about      *api.AboutHandler
		memfs      *handler.MemFSHandler
		diskfs     *handler.DiskFSHandler
		prometheus *handler.PrometheusHandler
		profiling  *handler.ProfilingHandler
		ping       *handler.PingHandler
		graph      *api.GraphHandler
		jwt        jwt.JWT
	}

	v3handler struct {
		log       *api.LogHandler
		restream  *api.RestreamHandler
		playout   *api.PlayoutHandler
		memfs     *api.MemFSHandler
		diskfs    *api.DiskFSHandler
		rtmp      *api.RTMPHandler
		srt       *api.SRTHandler
		config    *api.ConfigHandler
		session   *api.SessionHandler
		widget    *api.WidgetHandler
		resources *api.MetricsHandler
	}

	middleware struct {
		iplimit    echo.MiddlewareFunc
		log        echo.MiddlewareFunc
		accessJWT  echo.MiddlewareFunc
		refreshJWT echo.MiddlewareFunc
		cors       echo.MiddlewareFunc
		cache      echo.MiddlewareFunc
		session    echo.MiddlewareFunc
		hlsrewrite echo.MiddlewareFunc
	}

	memfs struct {
		enableAuth bool
		username   string
		password   string
	}

	diskfs fs.Filesystem

	gzip struct {
		mimetypes []string
	}

	router        *echo.Echo
	mimeTypesFile string
	profiling     bool

	readOnly bool
}

func NewServer(config Config) (Server, error) {
	s := &server{
		logger:        config.Logger,
		mimeTypesFile: config.MimeTypesFile,
		profiling:     config.Profiling,
		diskfs:        config.DiskFS,
		readOnly:      config.ReadOnly,
	}

	s.v3handler.diskfs = api.NewDiskFS(
		config.DiskFS,
		config.Cache,
	)

	s.handler.diskfs = handler.NewDiskFS(
		config.DiskFS,
		config.Cache,
	)

	s.middleware.hlsrewrite = mwhlsrewrite.NewHLSRewriteWithConfig(mwhlsrewrite.HLSRewriteConfig{
		PathPrefix: config.DiskFS.Base(),
	})

	s.memfs.enableAuth = config.MemFS.EnableAuth
	s.memfs.username = config.MemFS.Username
	s.memfs.password = config.MemFS.Password

	if config.Logger == nil {
		s.logger = log.New("HTTP")
	}

	if config.JWT == nil {
		s.handler.about = api.NewAbout(
			config.Restream,
			[]string{},
		)
	} else {
		s.handler.about = api.NewAbout(
			config.Restream,
			config.JWT.Validators(),
		)
	}

	s.v3handler.log = api.NewLog(
		config.LogBuffer,
	)

	if config.Restream != nil {
		s.v3handler.restream = api.NewRestream(
			config.Restream,
		)

		s.v3handler.playout = api.NewPlayout(
			config.Restream,
		)
	}

	if config.MemFS.Filesystem != nil {
		s.v3handler.memfs = api.NewMemFS(
			config.MemFS.Filesystem,
		)

		s.handler.memfs = handler.NewMemFS(
			config.MemFS.Filesystem,
		)
	}

	if config.Prometheus != nil {
		s.handler.prometheus = handler.NewPrometheus(
			config.Prometheus.HTTPHandler(),
		)
	}

	if config.Profiling {
		s.handler.profiling = handler.NewProfiling()
	}

	if config.IPLimiter != nil {
		s.middleware.iplimit = mwiplimit.NewWithConfig(mwiplimit.Config{
			Limiter: config.IPLimiter,
		})
	}

	s.handler.ping = handler.NewPing()

	if config.RTMP != nil {
		s.v3handler.rtmp = api.NewRTMP(
			config.RTMP,
		)
	}

	if config.SRT != nil {
		s.v3handler.srt = api.NewSRT(
			config.SRT,
		)
	}

	if config.Config != nil {
		s.v3handler.config = api.NewConfig(
			config.Config,
		)
	}

	if config.JWT != nil {
		s.handler.jwt = config.JWT
		s.middleware.accessJWT = config.JWT.AccessMiddleware()
		s.middleware.refreshJWT = config.JWT.RefreshMiddleware()
	}

	if config.Sessions == nil {
		config.Sessions, _ = session.New(session.Config{})
	}

	s.v3handler.session = api.NewSession(
		config.Sessions,
	)
	s.middleware.session = mwsession.NewHLSWithConfig(mwsession.HLSConfig{
		EgressCollector:  config.Sessions.Collector("hls"),
		IngressCollector: config.Sessions.Collector("hlsingress"),
	})

	s.middleware.log = mwlog.NewWithConfig(mwlog.Config{
		Logger: s.logger,
	})

	if config.Cache != nil {
		s.middleware.cache = mwcache.NewWithConfig(mwcache.Config{
			Cache: config.Cache,
		})
	}

	s.v3handler.widget = api.NewWidget(api.WidgetConfig{
		Restream: config.Restream,
		Registry: config.Sessions,
	})

	s.v3handler.resources = api.NewMetrics(api.MetricsConfig{
		Metrics: config.Metrics,
	})

	if middleware, err := mwcors.NewWithConfig(mwcors.Config{
		Prefixes: map[string][]string{
			"/":      config.Cors.Origins,
			"/api":   {"*"},
			"/memfs": config.Cors.Origins,
		},
	}); err != nil {
		return nil, err
	} else {
		s.middleware.cors = middleware
	}

	s.handler.graph = api.NewGraph(resolver.Resolver{
		Restream:  config.Restream,
		Monitor:   config.Metrics,
		LogBuffer: config.LogBuffer,
	}, "/api/graph/query")

	s.gzip.mimetypes = []string{
		"text/plain",
		"text/html",
		"text/javascript",
		"application/json",
		"application/x-mpegurl",
		"application/vnd.apple.mpegurl",
		"image/svg+xml",
	}

	s.router = echo.New()
	s.router.HTTPErrorHandler = errorhandler.HTTPErrorHandler
	s.router.Validator = validator.New()
	s.router.Use(s.middleware.log)
	s.router.Use(middleware.RecoverWithConfig(middleware.RecoverConfig{
		LogErrorFunc: func(c echo.Context, err error, stack []byte) error {
			rows := strings.Split(string(stack), "\n")
			s.logger.Error().WithField("stack", rows).Log("recovered from a panic")
			return nil
		},
	}))
	s.router.Use(mwsession.NewHTTPWithConfig(mwsession.HTTPConfig{
		Collector: config.Sessions.Collector("http"),
	}))

	s.router.HideBanner = true
	s.router.HidePort = true

	s.router.Logger.SetOutput(newLogwrapper(s.logger))

	if s.middleware.cors != nil {
		s.router.Use(s.middleware.cors)
	}

	// Add static routes
	if path, target := config.Router.StaticRoute(); len(target) != 0 {
		group := s.router.Group(path)
		group.Use(middleware.AddTrailingSlashWithConfig(middleware.TrailingSlashConfig{
			Skipper: func(c echo.Context) bool {
				return path != c.Request().URL.Path
			},
			RedirectCode: 301,
		}))
		group.Use(middleware.StaticWithConfig(middleware.StaticConfig{
			Skipper:    middleware.DefaultSkipper,
			Root:       target,
			Index:      "index.html",
			IgnoreBase: true,
		}))
	}

	s.router.Use(mwredirect.NewWithConfig(mwredirect.Config{
		Redirects: config.Router.FileRoutes(),
	}))

	for prefix, target := range config.Router.DirRoutes() {
		group := s.router.Group(prefix)
		group.Use(middleware.AddTrailingSlashWithConfig(middleware.TrailingSlashConfig{
			Skipper: func(prefix string) func(c echo.Context) bool {
				return func(c echo.Context) bool {
					return prefix != c.Request().URL.Path
				}
			}(prefix),
			RedirectCode: 301,
		}))
		group.Use(middleware.StaticWithConfig(middleware.StaticConfig{
			Skipper:    middleware.DefaultSkipper,
			Root:       target,
			Index:      "index.html",
			IgnoreBase: true,
		}))
	}

	s.setRoutes()

	return s, nil
}

func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	s.router.ServeHTTP(w, r)
}

func (s *server) setRoutes() {
	gzipMiddleware := mwgzip.NewWithConfig(mwgzip.Config{
		Level:     mwgzip.BestSpeed,
		MinLength: 1000,
		Skipper:   mwgzip.ContentTypeSkipper(nil),
	})

	// API router grouo
	api := s.router.Group("/api")

	if s.middleware.iplimit != nil {
		api.Use(s.middleware.iplimit)
	}

	if s.middleware.accessJWT != nil {
		// Enable JWT auth
		api.Use(s.middleware.accessJWT)

		// The login endpoint should not be blocked by auth
		s.router.POST("/api/login", s.handler.jwt.LoginHandler)
		s.router.GET("/api/login/refresh", s.handler.jwt.RefreshHandler, s.middleware.refreshJWT)
	}

	api.GET("", s.handler.about.About)

	// Swagger API documentation router group
	doc := s.router.Group("/api/swagger/*")
	doc.Use(gzipMiddleware)
	doc.GET("", echoSwagger.WrapHandler)

	// Serve static data
	fs := s.router.Group("/*")
	fs.Use(mwmime.NewWithConfig(mwmime.Config{
		MimeTypesFile:      s.mimeTypesFile,
		DefaultContentType: "text/html",
	}))
	fs.Use(mwgzip.NewWithConfig(mwgzip.Config{
		Level:     mwgzip.BestSpeed,
		MinLength: 1000,
		Skipper:   mwgzip.ContentTypeSkipper(s.gzip.mimetypes),
	}))
	if s.middleware.cache != nil {
		fs.Use(s.middleware.cache)
	}
	fs.Use(s.middleware.hlsrewrite)
	if s.middleware.session != nil {
		fs.Use(s.middleware.session)
	}

	fs.GET("", s.handler.diskfs.GetFile)
	fs.HEAD("", s.handler.diskfs.GetFile)

	// Memory FS
	if s.handler.memfs != nil {
		memfs := s.router.Group("/memfs/*")
		memfs.Use(mwmime.NewWithConfig(mwmime.Config{
			MimeTypesFile:      s.mimeTypesFile,
			DefaultContentType: "application/data",
		}))
		memfs.Use(mwgzip.NewWithConfig(mwgzip.Config{
			Level:     mwgzip.BestSpeed,
			MinLength: 1000,
			Skipper:   mwgzip.ContentTypeSkipper(s.gzip.mimetypes),
		}))
		if s.middleware.session != nil {
			memfs.Use(s.middleware.session)
		}

		memfs.HEAD("", s.handler.memfs.GetFile)
		memfs.GET("", s.handler.memfs.GetFile)

		var authmw echo.MiddlewareFunc

		if s.memfs.enableAuth {
			authmw = middleware.BasicAuth(func(username, password string, c echo.Context) (bool, error) {
				if username == s.memfs.username && password == s.memfs.password {
					return true, nil
				}

				return false, nil
			})

			memfs.POST("", s.handler.memfs.PutFile, authmw)
			memfs.PUT("", s.handler.memfs.PutFile, authmw)
			memfs.DELETE("", s.handler.memfs.DeleteFile, authmw)
		} else {
			memfs.POST("", s.handler.memfs.PutFile)
			memfs.PUT("", s.handler.memfs.PutFile)
			memfs.DELETE("", s.handler.memfs.DeleteFile)
		}
	}

	// Prometheus metrics
	if s.handler.prometheus != nil {
		metrics := s.router.Group("/metrics")

		if s.middleware.iplimit != nil {
			metrics.Use(s.middleware.iplimit)
		}

		metrics.GET("", s.handler.prometheus.Metrics)
	}

	// Health check
	s.router.GET("/ping", s.handler.ping.Ping)

	// Profiling routes
	if s.profiling {
		prof := s.router.Group("/profiling")

		if s.middleware.iplimit != nil {
			prof.Use(s.middleware.iplimit)
		}

		s.handler.profiling.Register(prof)
	}

	// GraphQL
	graphql := api.Group("/graph")
	graphql.Use(gzipMiddleware)

	graphql.GET("", s.handler.graph.Playground)
	graphql.POST("/query", s.handler.graph.Query)

	// APIv3 router group
	v3 := api.Group("/v3")

	if s.handler.jwt != nil {
		v3.Use(s.middleware.accessJWT)
	}

	v3.Use(gzipMiddleware)

	s.setRoutesV3(v3)
}

func (s *server) setRoutesV3(v3 *echo.Group) {
	if s.v3handler.widget != nil {
		// The widget endpoint should not be blocked by auth
		s.router.GET("/api/v3/widget/process/:id", s.v3handler.widget.Get)
	}

	// v3 Restreamer
	if s.v3handler.restream != nil {
		v3.GET("/skills", s.v3handler.restream.Skills)
		v3.GET("/skills/reload", s.v3handler.restream.ReloadSkills)

		v3.GET("/process", s.v3handler.restream.GetAll)
		v3.GET("/process/:id", s.v3handler.restream.Get)

		v3.GET("/process/:id/config", s.v3handler.restream.GetConfig)
		v3.GET("/process/:id/state", s.v3handler.restream.GetState)
		v3.GET("/process/:id/report", s.v3handler.restream.GetReport)
		v3.GET("/process/:id/probe", s.v3handler.restream.Probe)

		v3.GET("/process/:id/metadata", s.v3handler.restream.GetProcessMetadata)
		v3.GET("/process/:id/metadata/:key", s.v3handler.restream.GetProcessMetadata)

		v3.GET("/metadata", s.v3handler.restream.GetMetadata)
		v3.GET("/metadata/:key", s.v3handler.restream.GetMetadata)

		if !s.readOnly {
			v3.POST("/process", s.v3handler.restream.Add)
			v3.PUT("/process/:id", s.v3handler.restream.Update)
			v3.DELETE("/process/:id", s.v3handler.restream.Delete)
			v3.PUT("/process/:id/command", s.v3handler.restream.Command)
			v3.PUT("/process/:id/metadata/:key", s.v3handler.restream.SetProcessMetadata)
			v3.PUT("/metadata/:key", s.v3handler.restream.SetMetadata)
		}

		// v3 Playout
		if s.v3handler.playout != nil {
			v3.GET("/process/:id/playout/:inputid/status", s.v3handler.playout.Status)
			v3.GET("/process/:id/playout/:inputid/reopen", s.v3handler.playout.ReopenInput)
			v3.GET("/process/:id/playout/:inputid/keyframe/*", s.v3handler.playout.Keyframe)
			v3.GET("/process/:id/playout/:inputid/errorframe/encode", s.v3handler.playout.EncodeErrorframe)

			if !s.readOnly {
				v3.PUT("/process/:id/playout/:inputid/errorframe/*", s.v3handler.playout.SetErrorframe)
				v3.POST("/process/:id/playout/:inputid/errorframe/*", s.v3handler.playout.SetErrorframe)

				v3.PUT("/process/:id/playout/:inputid/stream", s.v3handler.playout.SetStream)
			}
		}
	}

	// v3 Memory FS
	if s.v3handler.memfs != nil {
		v3.GET("/fs/mem", s.v3handler.memfs.ListFiles)
		v3.GET("/fs/mem/*", s.v3handler.memfs.GetFile)

		if !s.readOnly {
			v3.DELETE("/fs/mem/*", s.v3handler.memfs.DeleteFile)
			v3.PUT("/fs/mem/*", s.v3handler.memfs.PutFile)
			v3.PATCH("/fs/mem/*", s.v3handler.memfs.PatchFile)
		}
	}

	// v3 Disk FS
	v3.GET("/fs/disk", s.v3handler.diskfs.ListFiles)
	v3.GET("/fs/disk/*", s.v3handler.diskfs.GetFile, mwmime.NewWithConfig(mwmime.Config{
		MimeTypesFile:      s.mimeTypesFile,
		DefaultContentType: "application/data",
	}))
	v3.HEAD("/fs/disk/*", s.v3handler.diskfs.GetFile, mwmime.NewWithConfig(mwmime.Config{
		MimeTypesFile:      s.mimeTypesFile,
		DefaultContentType: "application/data",
	}))

	if !s.readOnly {
		v3.PUT("/fs/disk/*", s.v3handler.diskfs.PutFile)
		v3.DELETE("/fs/disk/*", s.v3handler.diskfs.DeleteFile)
	}

	// v3 RTMP
	if s.v3handler.rtmp != nil {
		v3.GET("/rtmp", s.v3handler.rtmp.ListChannels)
	}

	// v3 SRT
	if s.v3handler.srt != nil {
		v3.GET("/srt", s.v3handler.srt.ListChannels)
	}

	// v3 Config
	if s.v3handler.config != nil {
		v3.GET("/config", s.v3handler.config.Get)

		if !s.readOnly {
			v3.PUT("/config", s.v3handler.config.Set)
			v3.GET("/config/reload", s.v3handler.config.Reload)
		}
	}

	// v3 Session
	if s.v3handler.session != nil {
		v3.GET("/session", s.v3handler.session.Summary)
		v3.GET("/session/active", s.v3handler.session.Active)
	}

	// v3 Log
	v3.GET("/log", s.v3handler.log.Log)

	// v3 Metrics
	v3.GET("/metrics", s.v3handler.resources.Describe)
	v3.POST("/metrics", s.v3handler.resources.Metrics)
}