package main

import "fmt"
import "os"
import "time"
import "net/http"

import "github.com/rs/zerolog/log"
import "github.com/gin-gonic/gin"
import "github.com/dn365/gin-zerolog"

type TootArchiverAPIServer struct {
	archiver *TootArchiver
}

func (a *TootArchiverAPIServer) Serve() {
	if a.archiver == nil {
		panic("must have archiver from which to serve stats")
	}
	s := a.getServer()
	err := s.ListenAndServe()
	if err != nil {
		log.Fatal().Msg("webserver failure: " + err.Error())
		return
	}
}

func (a *TootArchiverAPIServer) getRouter() *gin.Engine {
	if os.Getenv("DEBUG") == "" {
		gin.SetMode(gin.ReleaseMode)
	}

	// empty router
	r := gin.New()

	// wrap panics:
	r.Use(gin.Recovery())

	// attach logger middleware
	r.Use(ginzerolog.Logger("gin"))

	r.GET("/.well-known/healthcheck.json", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"status": "ok",
			"now":    time.Now().UTC().Format(time.RFC3339),
			"uptime": a.archiver.Uptime().String(),
		})
	})

	r.GET("/", func(c *gin.Context) {
		ir := a.archiver.manager.instanceSummaryReport()

		il := a.archiver.manager.instanceListForApi()
		c.JSON(200, gin.H{
			"status": "ok",
			"now":    time.Now().UTC().Format(time.RFC3339),
			"uptime": a.archiver.Uptime().String(),
			"instanceSummary": gin.H{
				"total":      ir.total,
				"up":         ir.up,
				"identified": ir.identified,
			},
			"instanceList": il,
		})
	})

	return r
}

func (a *TootArchiverAPIServer) getServer() *http.Server {
	r := a.getRouter()

	port := "8080"
	if os.Getenv("PORT") != "" {
		port = os.Getenv("PORT")
	}

	log.Info().Str("port", port).Msg("starting webserver")

	s := &http.Server{
		Addr:           fmt.Sprintf(":%s", port),
		Handler:        r,
		ReadTimeout:    10 * time.Second,
		WriteTimeout:   10 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}
	return s
}