package config

import (
	"errors"
	"log/slog"
	"reflect"
)

// JSCKLogging is the logging section's configuration key.
const JSCKLogging string = "logging"

// JobSearchConfigLogging configures logging. Level is one of debug, info,
// warn or error. File, if set, is where commands that log to a file write.
type JobSearchConfigLogging struct {
	Level string `cfg:"level" default:"warn"`
	File  string `cfg:"file"`
}

// ---------- Section methods (see Section) ----------

func (c JobSearchConfigLogging) Map() map[string]any { return mapOf(c) }

func (c JobSearchConfigLogging) Flatten() map[string]any {
	return flattenOf(JSCKLogging, c)
}

func (c JobSearchConfigLogging) TypeOf(key string) (reflect.Kind, error) {
	return typeOf(c, key)
}

func (c JobSearchConfigLogging) ValueOf(key string) (any, error) {
	return valueOf(c, key)
}

func (c *JobSearchConfigLogging) SetValue(key string, value any) error {
	return setValue(c, key, value)
}

// Keys returns the keys directly in the section.
func (c *JobSearchConfigLogging) Keys() []string { return keysOf(c) }

// ---------- Section specific methods ----------

// validate checks values before they are stored (see validator).
func (c *JobSearchConfigLogging) validate(key string, value any) error {
	switch key {
	case "level":
		switch value.(string) {
		case "debug", "info", "warn", "error":
		default:
			return errors.New(
				"invalid log level. Must be one of: debug, info, warn, error")
		}
	}
	return nil
}

// ConfigLevelToLogLevel converts a configured level name to an slog level. An
// unknown name gives 99, above every real level, so nothing is logged.
func ConfigLevelToLogLevel(level string) slog.Level {
	switch level {
	case "debug":
		return slog.LevelDebug
	case "info":
		return slog.LevelInfo
	case "warn":
		return slog.LevelWarn
	case "error":
		return slog.LevelError
	default:
		return 99
	}
}

// LogLevel returns the configured level as an slog level. An unknown level
// gives 99, above every real level, so nothing is logged.
func (c *JobSearchConfigLogging) LogLevel() slog.Level {
	return ConfigLevelToLogLevel(c.Level)
}