package status // import "hhvn.uk/hbspbar/status"

import (
	"fmt"
	"strings"

	"hhvn.uk/hbspbar/common"
)

func checkMemField(m map[string]int, k string) error {
	_, ok := m[k]
	if !ok {
		return fmt.Errorf("missing %s", k)
	}
	return nil
}

func mem(name string) error {
	u := newUpdate(name)

	mem := make(map[string]int)

	lines, err := common.FileAsLines("/proc/meminfo")
	if err != nil { return err }

	for _, l := range lines {
		name, rest, _ := strings.Cut(l, ":")
		val := strings.TrimLeft(strings.TrimSuffix(rest, " kB"), " ")

		n, err := common.Intify(val)
		if err != nil { return err }

		mem[name] = n
	}

	if err := checkMemField(mem, "MemTotal"); err != nil { return err }
	if err := checkMemField(mem, "MemAvailable"); err != nil { return err }

	total  := mem["MemTotal"]
	used   := total - mem["MemAvailable"]
	p      := int(float64(used) / float64(total) * 100.0)
	cx     := 0
	
	cx     += u.drawPercentBar(cx, p)
	_, err  = u.drawText(cx, blendGYR(p), fmt.Sprintf("%d%%", p))

	updates <- u

	sleep(1)

	return nil
}

func init() {
	register("mem", mem)
}