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

import (
	"os"
	"path"
	"errors"
	"strings"
	"image/color"

	// "hhvn.uk/hbspbar/drw"
	"hhvn.uk/hbspbar/config"
	"hhvn.uk/hbspbar/common"
)

func bat(name string) error {
	dir := "/sys/class/power_supply"

	const (
		nothing = iota
		charging
		discharging
	)

	u := newUpdate(name)

	dirs, err := os.ReadDir(dir)
	if dirs == nil { return err }

	totalcap := 0
	usedcap := 0

	stati := nothing

	for _, d := range dirs {
		if !strings.HasPrefix(d.Name(), "BAT") { continue }
		
		caps, err := common.FileAsLines(path.Join(dir, d.Name(), "capacity"))
		if err != nil { return err }

		capi, err := common.Intify(caps[0])
		if err != nil { return err }

		totalcap += 100
		usedcap += capi

		stats, err := common.FileAsLines(path.Join(dir, d.Name(), "status"))
		if err != nil { return err }

		// Doesn't deal with 1 battery charging, and another discharging but w/e
		switch stats[0] {
		case "Charging": if charging > stati { stati = charging }
		case "Discharging": if discharging > stati { stati = discharging}
		}
	}

	if totalcap == 0 {
		return errors.New("no batteries")
	}

	avgcap := (usedcap * 100) / totalcap

	var c color.Color

	// Colour of outline = charge indicator
	switch stati {
	case nothing:     c = config.Fg
	case charging:    c = config.Green
	case discharging: c = config.Red
	}

	var iw int = 20
	var ih int = int(config.H) - 8
	var w  int = iw * avgcap / 100

	// Draw nose
	u.drawRect(2, int((config.H - 5) / 2), 2, 5, c, true)

	// Draw border
	u.drawRect(4, 3, iw + 2, ih + 2, c, false)

	switch {
	case avgcap < 25:  c = config.Red
	case avgcap >= 99: c = config.Green
	default:           c = config.FgDark
	}

	// Fill
	u.drawRect(4 + iw - w, 4, w + 1, ih, c, true)

	updates <- u
	sleep(1)

	return nil
}

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