package web

import (
	"errors"
	"git.timovolkmann.de/gyrogpsc/core"
	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/template/html"
	"github.com/gofiber/websocket/v2"
	"github.com/google/uuid"
	"github.com/sirupsen/logrus"
)

func CreateServer(s *core.TrackingService, sub core.Subscriber, c *core.Configuration) {
	app := fiber.New(fiber.Config{
		Views: fiberTemplateEngine(c),
	})
	app.Static("/static", "static")

	// Application Main Page
	app.Get("/", fiberHomeHandler)
	app.Get("/tracking", fiberTrackingHandler)

	// Websocket
	app.Get("/ws", websocket.New(createFiberWebsocketHandler(sub)))

	// Tracking persistence controls HTTP JSON RPC API
	trackings := app.Group("/trackings")
	trackings.Get("/", allTrackingsHandler(s, c))            // Get all trackings Metadata
	trackings.Post("/", startPipelineHandler(s, c))          // Initialize new tracking, open websocket and prepare for automatic recording. Toggle ?serial=true and ?tcp=true. Returns trackingId
	trackings.Patch("/", startRecordingHandler(s, c))        // Starts recording
	trackings.Put("/", stopRecordingHandler(s, c))           // Stops current recording. Returns trackingId if record was successful
	trackings.Delete("/", stopAllHandler(s, c))              // Stops websocket connection, pipelines and collectors
	trackings.Get("/:trackingId", LoadTrackingHandler(s, c)) // Gets Tracking Metadata and loads sensorRecords from storage.

	logrus.Fatal(app.Listen(c.Webserver.Port))
}

func LoadTrackingHandler(s *core.TrackingService, c *core.Configuration) fiber.Handler {
	return func(ctx *fiber.Ctx) error {
		trackId := ctx.Params("trackingId")
		uid, err := uuid.Parse(trackId)
		if err != nil {
			logrus.Error(err)
			ctx.Status(404).JSON(err)
			return err
		}
		var replay bool
		if ctx.Query("replay", "false") == "true" {
			replay = true
		} else {
			replay = false
		}
		tracking, err := s.LoadTracking(uid, replay)
		if err != nil {
			logrus.Error(err)
			ctx.Status(404).JSON(err)
			return err
		}
		st := struct {
			core.TrackingMetadata
			Data map[string][]core.SensorData
		}{}
		st.TrackingMetadata = tracking.TrackingMetadata
		st.Data = make(map[string][]core.SensorData)
		for _, el := range tracking.Data {
			st.Data[string(el.Source())] = append(st.Data[string(el.Source())], el)
		}
		prepres := make(map[string]interface{})
		prepres["data"] = st

		err2 := ctx.JSON(prepres)
		if err2 != nil {
			ctx.Status(500).JSON(err2)
			return err2
		}
		return nil
	}
}
func allTrackingsHandler(s *core.TrackingService, c *core.Configuration) fiber.Handler {
	return func(ctx *fiber.Ctx) error {
		trackings, err := s.AllTrackings()

		prepres := make(map[string]interface{})
		prepres["data"] = trackings
		if err != nil {
			prepres["error"] = err.Error()
		}
		err2 := ctx.JSON(prepres)
		if err2 != nil {
			ctx.Status(500).JSON(err2)
			return err2
		}
		return nil
	}
}

func startPipelineHandler(s *core.TrackingService, c *core.Configuration) fiber.Handler {
	return func(ctx *fiber.Ctx) error {
		var collecs []core.CollectorType
		ser := ctx.Query("serial", "true")
		if ser == "true" {
			collecs = append(collecs, core.SERIAL)
		} else if ser != "false" && ser != "" {
			collecs = append(collecs, core.CollectorType(ser)) // TODO: allow passing serial port as url parameter
		}
		tcp := ctx.Query("tcp", "true")
		logrus.Debugln("query values: serial/tcp", ser, tcp)
		if tcp == "true" {
			collecs = append(collecs, core.TCP)
		}
		res, err := s.StartLivetracking(collecs...)

		prepres := make(map[string]interface{})
		prepres["tracking_state"] = res
		prepres["data"] = collecs
		if err != nil {
			prepres["error"] = err.Error()
		}
		if len(collecs) == 0 {
			e := errors.New("attention! no collectors running. start a new pipeline")
			prepres["error"] = e.Error()
		}
		err2 := ctx.JSON(prepres)
		if err2 != nil {
			ctx.Status(500).JSON(err2)
			return err2
		}
		return nil
	}
}

func startRecordingHandler(s *core.TrackingService, c *core.Configuration) fiber.Handler {
	return func(ctx *fiber.Ctx) error {
		rec, err := s.StartRecord()

		prepres := make(map[string]interface{})
		prepres["tracking_state"] = "RECORD"
		prepres["data"] = rec
		if err != nil {
			prepres["error"] = err.Error()

		}
		err2 := ctx.JSON(prepres)
		if err2 != nil {
			ctx.Status(500).JSON(err2)
			return err2
		}
		return nil
	}
}

func stopRecordingHandler(s *core.TrackingService, c *core.Configuration) fiber.Handler {
	return func(ctx *fiber.Ctx) error {
		rec, err := s.StopRecord()

		prepres := make(map[string]interface{})
		prepres["tracking_state"] = "LIVE"
		prepres["data"] = rec
		if err != nil {
			prepres["error"] = err.Error()

		}
		err2 := ctx.JSON(prepres)
		if err2 != nil {
			ctx.Status(500).JSON(err2)
			return err2
		}
		return nil
	}
}

func stopAllHandler(s *core.TrackingService, c *core.Configuration) fiber.Handler {
	return func(ctx *fiber.Ctx) error {
		rec, err := s.StopAll()

		prepres := make(map[string]interface{})
		prepres["tracking_state"] = "STOPPED"
		prepres["data"] = rec
		if err != nil {
			prepres["error"] = err.Error()

		}
		err2 := ctx.JSON(prepres)
		if err2 != nil {
			ctx.Status(500).JSON(err2)
			return err2
		}
		return nil
	}
}

func createFiberWebsocketHandler(s core.Subscriber) func(conn *websocket.Conn) {
	return func(c *websocket.Conn) {
		logrus.Info("new websocket client")
		// Handle and discard inbound messages
		go func() {
			for {
				if _, _, err := c.NextReader(); err != nil {
					c.Close()
					break
				}
			}
		}()

		dispatcherId, channel := s.Subscribe()
		defer s.Unsubscribe(dispatcherId)
		for {
			cmsg := <-channel
			logrus.Traceln("write to ws:", cmsg)
			err := c.WriteMessage(websocket.TextMessage, []byte(cmsg))
			if err != nil {
				logrus.Infoln("close websocket connection", err)
				c.Close()
				break
			}
		}
	}
}

func fiberTemplateEngine(c *core.Configuration) *html.Engine {
	// Create a new engine by passing the template folder
	// and template extension using <engine>.New(dir, ext string)
	engine := html.New("./templates", ".html")

	// We also support the http.FileSystem interface
	// See examples below to load templates from embedded files
	// engine := html.NewFileSystem(http.Dir("./views"), ".html")

	// Reload the templates on each render, good for development
	//engine.Reload(strings.ToLower(c.Debuglevel) == "debug") // Optional. Default: false
	engine.Reload(true) // Optional. Default: false

	// Debug will print each template that is parsed, good for debugging
	//engine.Debug(strings.ToLower(c.Debuglevel) == "debug") // Optional. Default: false
	engine.Debug(true) // Optional. Default: false

	// Layout defines the variable name that is used to yield templates within layouts
	//engine.Layout("embed") // Optional. Default: "embed"

	// Delims sets the action delimiters to the specified strings
	//engine.Delims("{{", "}}") // Optional. Default: engine delimiters

	// AddFunc adds a function to the template's global function map.
	//engine.AddFunc("greet", func(name string) string {
	//    return "Hello, " + name + "!"
	//})
	return engine
}

func fiberHomeHandler(c *fiber.Ctx) error {
	// Render index template
	return c.Render("index", "ws://"+c.Hostname()+"/ws")
}

func fiberTrackingHandler(c *fiber.Ctx) error {
	// Render index template
	return c.Render("replayFull", nil)
}