package flog

import (
	"io"
	"time"
)

// LevelType defines the level type
type LevelType uint8

// All possible log levels
const (
	LevelDebug LevelType = iota
	LevelInfo
	LevelWarning
	LevelError
	LevelCritical
)

var levels = []string{`debug`, `info`, `warning`, `error`, `critical`}

// String returns the name of the level as string
func (l LevelType) String() string {
	return levels[l]
}

// LogEntry is an entry for the log
type LogEntry struct {
	Level      LevelType         `json:"level"`
	Time       time.Time         `json:"time"`
	Message    string            `json:"message"`
	StackTrace []StackTraceEntry `json:"stack_trace,omitempty"`
}

// StackTraceEntry is an entry in the stack trace
type StackTraceEntry struct {
	Function string `json:"function"`
	File     string `json:"file"`
	Line     int    `json:"line"`
}

// LogFormatType defines the log format
type LogFormatType interface {
	FormatMessage(io.Writer, LogEntry)
}