package log

import (
	"io"
	"os"
)

// logger is just an index into the loggers pool.
type logger int

const DefaultLogger logger = 0

// loggers is the pool of available loggers. The first entry always is empty,
// describing the default logger.
//var loggers []string = make([]string, 1, 10)
//var levels []level = make([]level, 1, 10)
//var targets []io.Writer = make([]io.Writer, 1, 10)

type loggerData struct {
	name   string
	level  level
	target io.Writer
	format Formatter
}

var loggers []loggerData = make([]loggerData, 1, 10)

func init() {
	DefaultLogger.SetLevel(INFO)
	DefaultLogger.SetTarget(os.Stdout)
	DefaultLogger.SetFormatter(&PlainFormatter{})
}

// Logger returns a logger with the given name. If there is no logger with this
// name, a new one will be created.
func Logger(name string) logger {
	for i, v := range loggers {
		if v.name == name {
			return logger(i)
		}
	}
	loggers = append(loggers, loggerData{
		name:   name,
		level:  INFO,
		target: os.Stdout,
		format: &PlainFormatter{},
	})
	return logger(len(loggers) - 1)
}

// Level returns the log level this logger is set to.
func (l logger) Level() level {
	return loggers[l].level
}

// SetLevel sets the log level for this logger. Returns the logger, which enables chaining during initialization.
func (l logger) SetLevel(lvl level) logger {
	loggers[l].level = lvl
	return l
}

func (l logger) Target() io.Writer {
	return loggers[l].target
}

// SetTarget sets the logging target. Returns the logger, which enables chaining during initialization.
func (l logger) SetTarget(t io.Writer) logger {
	loggers[l].target = t
	return l
}

func (l logger) Formatter() Formatter {
	return loggers[l].format
}

func (l logger) SetFormatter(f Formatter) logger {
	loggers[l].format = f
	return l
}

func (l logger) String() string {
	return loggers[l].name
}

// Configure parses a config string, enabling the configuration of multiple loggers at once.
// [logger:]level[@target][#format]
// target may be a file name
func Configure(config string) error {

	return nil
}