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

import (
	"fmt"
	"time"
	"sync"
	"image"

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

var Status   map[int]*status
var Mutex    sync.Mutex
var statusid map[string]int
var Updated  chan bool
var updates  chan *status

const (
	Red    = 0xffaa2222
	Orange = 0xffaa7700
	Green  = 0xff00aa00
	Black  = 0xff000000
	Grey   = 0xff888888
	Yellow = 0xffaaaa00
	White  = 0xffcccccc
)

func init() {
	Status   = make(map[int]*status)
	statusid = make(map[string]int)
	Updated  = make(chan bool)
	updates  = make(chan *status)

	go func() {
		for {
			s := <- updates

			id := statusid[s.Name]

			Mutex.Lock()
			Status[id] = s
			Mutex.Unlock()

			Updated <- true
		}
	}()
}

func register(name string) {
	nid := 0
	for _, id := range statusid {
		if id >= nid {
			nid = id + 1
		}
	}
	statusid[name] = nid
}

type status struct {
	Name string
	I    *image.RGBA
	W    int
}

func newUpdate(name string) (*status) {
	var s status

	s.Name = name
	s.W    = 0
	s.I    = image.NewRGBA(image.Rect(0, 0, 1000, int(config.H)))

	// Use drw's in order not to modify s.W
	drw.DrawRect(s.I, 0, 0, 1000, int(config.H), config.Status, true)

	return &s
}

func checkError(name string, err error) {
	if err == nil { return }

	common.Error("status \"%s\": %s\n", name, err)

	u := newUpdate(name)
	u.drawText(0, Red, fmt.Sprintf("[err: %s]", name))
	updates <- u

	sleep(5)
}

func sleep(s int) {
	time.Sleep(time.Duration(s) * time.Second)
}

func blendGYR(percent int) uint32 {
	return drw.Blend3(Green, Yellow, Red, percent)
}

func (s *status) furthest(x int) {
	if x > s.W {
		s.W = x
	}
}

func (s *status) drawText(x int, col uint32, text string) (int, error) {
	w, err := drw.DrawText(s.I, x, col, text)
	s.furthest(x + w)
	return w, err
}

func (s *status) drawRect(x, y, w, h int, c uint32, fill bool) {
	drw.DrawRect(s.I, x, y, w, h, c, fill)
	s.furthest(x + w)
}