package gpaste

import (
	"fmt"
	"io"
	"os"
	"strings"

	"github.com/pelletier/go-toml"
)

type ServerConfig struct {
	LogLevel   string             `toml:"LogLevel"`
	URL        string             `toml:"URL"`
	ListenAddr string             `toml:"ListenAddr"`
	Store      *ServerStoreConfig `toml:"Store"`
}

type ServerStoreConfig struct {
	Type string                    `toml:"Type"`
	FS   *ServerStoreFSStoreConfig `toml:"FS"`
}

type ServerStoreFSStoreConfig struct {
	Dir string `toml:"Dir"`
}

func ServerConfigFromReader(r io.Reader) (*ServerConfig, error) {
	decoder := toml.NewDecoder(r)
	c := ServerConfig{
		Store: &ServerStoreConfig{
			FS: &ServerStoreFSStoreConfig{},
		},
	}
	if err := decoder.Decode(&c); err != nil {
		return nil, fmt.Errorf("error decoding server config: %w", err)
	}

	c.updateFromEnv()

	return &c, nil
}

func (sc *ServerConfig) updateFromEnv() {
	if value, ok := os.LookupEnv("GPASTE_LOGLEVEL"); ok {
		sc.LogLevel = strings.ToUpper(value)
	}

	if value, ok := os.LookupEnv("GPASTE_URL"); ok {
		sc.URL = value
	}

	if value, ok := os.LookupEnv("GPASTE_LISTENADDR"); ok {
		sc.ListenAddr = value
	}

	if value, ok := os.LookupEnv("GPASTE_STORE_TYPE"); ok {
		sc.Store.Type = value
	}

	if value, ok := os.LookupEnv("GPASTE_STORE_FS_DIR"); ok {
		sc.Store.FS.Dir = value
	}
}