package process

import (
	"fmt"
	"net/http"
	"runtime"
	"strings"
	"time"

	u "git.eeqj.de/sneak/goutil"
	"github.com/flosch/pongo2"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/labstack/echo"
)

type hash map[string]interface{}

func (a *Server) instances() []hash {
	resp := make([]hash, 0)
	now := time.Now()
	for _, v := range a.feta.manager.ListInstances() {
		i := make(hash)
		// TODO move this locking onto a method on Instance that just
		// returns a new hash
		// FIXME figure out why a very short lock here deadlocks
		v.Lock()
		i["hostname"] = v.Hostname
		i["uuid"] = v.UUID.String()
		i["nextCheck"] = v.NextFetch.UTC().Format(time.RFC3339)
		i["nextCheckAfter"] = (-1 * now.Sub(v.NextFetch)).String()
		i["successCount"] = v.SuccessCount
		i["errorCount"] = v.ErrorCount
		i["identified"] = v.Identified
		//this only locks the FSM, not the whole instance struct
		i["status"] = v.Status()
		i["software"] = "unknown"
		i["version"] = "unknown"
		if v.Identified {
			i["software"] = v.ServerImplementationString
			i["version"] = v.ServerVersionString
		}
		v.Unlock()
		resp = append(resp, i)
	}

	for _, item := range resp {
		count, err := a.feta.dbm.TootCountForHostname(item["hostname"].(string))
		item["tootCount"] = 0
		if err != nil {
			item["tootCount"] = count
		}
	}
	return resp
}

func (a *Server) instanceSummary() map[string]int {
	resp := make(map[string]int)
	for _, v := range a.feta.manager.ListInstances() {
		v.Lock()
		resp[fmt.Sprintf("STATUS_%s", v.Status())]++
		if v.ServerImplementationString != "" {
			impl := strings.ToUpper(u.FilterToAlnum(v.ServerImplementationString))
			resp[fmt.Sprintf("SOFTWARE_%s", impl)]++
		}
		v.Unlock()
	}
	return resp
}

/*
func (a *Server) getInstanceListHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {

		result := &gin.H{
			"instances": a.instances(),
		}

		json, err := json.Marshal(result)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		w.Header().Set("Content-Type", "application/json")
		w.Write(json)
	}
}
*/

func (a *Server) notFoundHandler(c echo.Context) error {
	return c.String(http.StatusNotFound, "404 not found")
}

func (a *Server) instanceHandler(c echo.Context) error {
	tu := c.Param("uuid")
	u, err := uuid.Parse(tu)
	if err != nil {
		return a.notFoundHandler(c)
	}

	tc := pongo2.Context{}
	instances := a.feta.manager.ListInstances()
	found := false
	for _, item := range instances {
		if item.UUID == u {
			tc["instance"] = item
			found = true
		}
	}

	if !found {
		return a.notFoundHandler(c)
	}

	return c.Render(http.StatusOK, "instance.html", tc)
}

func (a *Server) indexHandler(c echo.Context) error {
	tc := pongo2.Context{
		"time":      time.Now().UTC().Format(time.RFC3339Nano),
		"gitrev":    a.feta.version,
		"instances": a.instances(),
	}
	return c.Render(http.StatusOK, "index.html", tc)
}

func (a *Server) statsHandler(c echo.Context) error {
	index := &gin.H{
		"server": &gin.H{
			"now":        time.Now().UTC().Format(time.RFC3339),
			"uptime":     a.feta.uptime().String(),
			"goroutines": runtime.NumGoroutine(),
			"goversion":  runtime.Version(),
			"version":    a.feta.version,
			"buildarch":  a.feta.buildarch,
		},
		"instanceSummary": a.instanceSummary(),
	}

	return c.JSONPretty(http.StatusOK, index, "    ")
}

func (a *Server) healthCheckHandler(c echo.Context) error {
	resp := &gin.H{
		"status": "ok",
		"now":    time.Now().UTC().Format(time.RFC3339),
		"uptime": a.feta.uptime().String(),
	}
	return c.JSONPretty(http.StatusOK, resp, "    ")

}