package logr

import (
	"sync"
)

// CustomFilter allows targets to enable logging via a list of levels.
type CustomFilter struct {
	mux    sync.RWMutex
	levels map[LevelID]Level
}

// IsEnabled returns true if the specified Level exists in this list.
func (st *CustomFilter) IsEnabled(level Level) bool {
	st.mux.RLock()
	defer st.mux.RUnlock()
	_, ok := st.levels[level.ID]
	return ok
}

// IsStacktraceEnabled returns true if the specified Level requires a stack trace.
func (st *CustomFilter) IsStacktraceEnabled(level Level) bool {
	st.mux.RLock()
	defer st.mux.RUnlock()
	lvl, ok := st.levels[level.ID]
	if ok {
		return lvl.Stacktrace
	}
	return false
}

// Add adds one or more levels to the list. Adding a level enables logging for
// that level on any targets using this CustomFilter.
func (st *CustomFilter) Add(levels ...Level) {
	st.mux.Lock()
	defer st.mux.Unlock()

	if st.levels == nil {
		st.levels = make(map[LevelID]Level)
	}

	for _, s := range levels {
		st.levels[s.ID] = s
	}
}