package main
import (
"fmt"
"github.com/sam-rba/share"
"html/template"
"log"
"net/http"
)
const dashboardHtml = `
HVAC Dashboard
Average humidity:
{{/* A value less than 0 means no data. */}}
{{- if ge .Average 0.0 -}}
{{ printf "%.1f%%" .Average }}
{{- else -}}
unknown
{{- end -}}
Duty cycle:
{{/* A value less than 0 means no data. */}}
{{- if ge .DutyCycle 0.0 -}}
{{ printf "%.1f%%" .DutyCycle }}
{{- else -}}
unknown
{{- end -}}
| Room | Humidity |
|---|
{{ range $id, $humidity := .Rooms }}
| {{ $id }} |
{{/* A value less than 0 means no data. */}}
{{- if ge $humidity 0.0 -}}
{{ printf "%.1f%%" $humidity }}
{{- else -}}
unknown
{{- end -}}
|
{{ end }}
`
var dashboard = template.Must(template.New("dashboard").Parse(dashboardHtml))
type Dashboard struct {
Average Humidity
DutyCycle DutyCycle
Rooms map[RoomID]Humidity
}
type DashboardHandler struct {
building Building
dutyCycle share.Val[DutyCycle]
}
func (h DashboardHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
log.Println(r.Method, r.URL)
if r.Method != http.MethodGet {
w.WriteHeader(http.StatusMethodNotAllowed)
fmt.Fprintf(w, "invalid method: '%s'", r.Method)
return
}
db := h.buildDashboard()
err := dashboard.Execute(w, db)
if err != nil {
log.Println(err)
}
}
func (h DashboardHandler) buildDashboard() Dashboard {
average, ok := h.building.average()
if !ok {
average = -1
}
var duty DutyCycle
if dutyp, ok := h.dutyCycle.TryGet(); ok {
duty = *dutyp
} else {
duty = -1
}
rooms := make(map[RoomID]Humidity)
for id, record := range h.building {
c := make(chan Humidity)
record.getRecent <- c
humidity, ok := <-c
if !ok {
humidity = -1
}
rooms[id] = humidity
}
return Dashboard{average, duty, rooms}
}