package config

import (
	"fmt"
	"os"
	"strconv"
)

type Config struct {
	Server ServerConfig
	GRPC   GRPCConfig
	S3     S3Config
	Auth   AuthConfig
}

type ServerConfig struct {
	Port string
	Host string
}

type GRPCConfig struct {
	AuthServiceAddr         string
	UserServiceAddr         string
	CompetitionServiceAddr  string
	TaskServiceAddr         string
	SubmissionServiceAddr   string
	ResultsServiceAddr      string
	ReviewServiceAddr       string
	AchievementsServiceAddr string
}

type S3Config struct {
	AccessKeyID     string
	SecretAccessKey string
	Region          string
	Bucket          string
	Endpoint        string
}

type AuthConfig struct {
	JWTSecret string
}

func Load() (*Config, error) {
	cfg := &Config{
		Server: ServerConfig{
			Port: getEnv("SERVER_PORT", "8080"),
			Host: getEnv("SERVER_HOST", "0.0.0.0"),
		},
		GRPC: GRPCConfig{
			AuthServiceAddr:         getEnvRequired("AUTH_SERVICE_ADDR"),
			UserServiceAddr:         getEnvRequired("USER_SERVICE_ADDR"),
			CompetitionServiceAddr:  getEnvRequired("COMPETITION_SERVICE_ADDR"),
			TaskServiceAddr:         getEnvRequired("TASK_SERVICE_ADDR"),
			SubmissionServiceAddr:   getEnvRequired("SUBMISSION_SERVICE_ADDR"),
			ResultsServiceAddr:      getEnvRequired("RESULTS_SERVICE_ADDR"),
			ReviewServiceAddr:       getEnvRequired("REVIEW_SERVICE_ADDR"),
			AchievementsServiceAddr: getEnvRequired("ACHIEVEMENTS_SERVICE_ADDR"),
		},
		S3: S3Config{
			AccessKeyID:     getEnvRequired("AWS_ACCESS_KEY_ID"),
			SecretAccessKey: getEnvRequired("AWS_SECRET_ACCESS_KEY"),
			Region:          getEnvRequired("AWS_REGION"),
			Bucket:          getEnvRequired("S3_BUCKET"),
			Endpoint:        getEnv("S3_ENDPOINT", ""),
		},
		Auth: AuthConfig{
			JWTSecret: getEnv("JWT_SECRET", ""),
		},
	}

	return cfg, nil
}

func getEnv(key, defaultValue string) string {
	value := os.Getenv(key)
	if value == "" {
		return defaultValue
	}
	return value
}

func getEnvRequired(key string) string {
	value := os.Getenv(key)
	if value == "" {
		panic(fmt.Sprintf("required environment variable %s is not set", key))
	}
	return value
}

func getEnvAsInt(key string, defaultValue int) int {
	valueStr := os.Getenv(key)
	if valueStr == "" {
		return defaultValue
	}
	value, err := strconv.Atoi(valueStr)
	if err != nil {
		return defaultValue
	}
	return value
}