package hiedalog

const (
	DLN_FATAL   = "FATAL"
	DLN_PANIC   = "PANIC"
	DLN_ERROR   = "ERROR"
	DLN_WARN    = "WARN"
	DLN_INFO    = "INFO"
	DLN_VERBOSE = "VERBOSE"
	DLN_DEBUG   = "DEBUG"
)

type HiedaLogLevel struct {
	Name        string
	LevelNumber uint8
}

type HiedaLogLevelFilter struct {
	levelNameMap   map[string]HiedaLogLevel
	defaultLevelID uint8
}

func (f *HiedaLogLevelFilter) NameToID(name string) uint8 {
	v, ok := f.levelNameMap[name]
	if ok {
		return v.LevelNumber
	} else {
		return f.defaultLevelID
	}
}

func (f *HiedaLogLevelFilter) NameToLevel(name string) HiedaLogLevel {
	v, ok := f.levelNameMap[name]
	if ok {
		return v
	} else {
		return HiedaLogLevel{Name: name, LevelNumber: f.defaultLevelID}
	}
}

func (f *HiedaLogLevelFilter) CanEmit(name string, reflevel uint8) bool {
	id := f.NameToID(name)
	return id <= reflevel
}

func (f *HiedaLogLevelFilter) CanEmitEx(name string, reflevel uint8) (bool, HiedaLogLevel) {
	l := f.NameToLevel(name)
	return l.LevelNumber <= reflevel, l
}

func (f *HiedaLogLevelFilter) GetLevelList() []HiedaLogLevel {
	o := make([]HiedaLogLevel, 0, len(f.levelNameMap))
	for _, v := range f.levelNameMap {
		o = append(o, v)
	}
	return o
}

func NewLevelFilter(levelList []HiedaLogLevel, defaultLevelID uint8) HiedaLogLevelFilter {
	m := make(map[string]HiedaLogLevel)
	for _, v := range levelList {
		m[v.Name] = v
	}
	return HiedaLogLevelFilter{
		levelNameMap:   m,
		defaultLevelID: defaultLevelID,
	}
}

func NewDefaultLevelFilter() HiedaLogLevelFilter {
	ld := []HiedaLogLevel{
		{Name: "FATAL", LevelNumber: 0},
		{Name: "PANIC", LevelNumber: 1},
		{Name: "ERROR", LevelNumber: 2},
		{Name: "WARN", LevelNumber: 3},
		{Name: "INFO", LevelNumber: 4},
		{Name: "VERBOSE", LevelNumber: 5},
		{Name: "DEBUG", LevelNumber: 6},
		{Name: "UNKNOWN", LevelNumber: 7},
	}
	return NewLevelFilter(ld, 7)
}