// Package settings owns this project's configuration; it adds no business identity model.
package config

import (
	"errors"
	"os"
	"strings"
	"time"

	"git.yuntuo.hk/k2safe/go-omni/config"
	"git.yuntuo.hk/k2safe/go-omni/logx"
)

type Config struct {
	Server config.Config `json:"server"`
}

func Default() Config {
	server := config.Default()
	server.Address = "127.0.0.1:8080"
	server.EnableLogger = true
	server.SlowRequestThreshold = 500 * time.Millisecond
	server.Log.Service = "example.com/managed"
	server.Log.Format = "json"
	server.Log.Output = "stderr"
	return Config{Server: server}
}

// Load uses defaults -> strict YAML/JSON -> nonempty environment variables.
// Pass an empty path to use only defaults and environment.
func Load(path string) (Config, error) {
	cfg := Default()
	var err error
	if path != "" {
		cfg, err = config.DecodeFile(path, cfg)
		if err != nil {
			return Config{}, err
		}
	}
	cfg.Server, err = config.ApplyEnv(cfg.Server, "")
	if err != nil {
		return Config{}, err
	}
	// A stream explicitly selected by environment overrides a file profile.
	if output := strings.TrimSpace(os.Getenv("GO_OMNI_LOG_OUTPUT")); output != "" && strings.TrimSpace(os.Getenv("GO_OMNI_LOG_FILE")) == "" {
		cfg.Server.Log.File = ""
		cfg.Server.Log.Rotation = logx.RotationConfig{}
	}

	if err = cfg.Validate(); err != nil {
		return Config{}, err
	}
	return cfg, nil
}
func (c Config) Validate() error {

	if err := c.Server.Validate(); err != nil {
		return err
	}
	if c.Server.Log.Format != "json" && c.Server.Log.Format != "text" {
		return errors.New("log.format must be json or text")
	}
	switch strings.ToLower(c.Server.Log.Level) {
	case "debug", "info", "warn", "warning", "error":
	default:
		return errors.New("invalid log.level")
	}
	return nil
}