package config

import (
	"time"

	sharedpostgres "knowfoolery/backend/shared/infra/database/postgres"
	sharedredis "knowfoolery/backend/shared/infra/database/redis"
	"knowfoolery/backend/shared/infra/observability/logging"
	"knowfoolery/backend/shared/infra/observability/metrics"
	"knowfoolery/backend/shared/infra/observability/tracing"
	"knowfoolery/backend/shared/infra/utils/envutil"
)

// Config holds runtime service configuration.
type Config struct {
	AppName string

	Port       int
	Env        string
	LogLevel   string
	CacheTTL   time.Duration
	MaxExclude int
	BulkMax    int

	Postgres sharedpostgres.Config
	Redis    sharedredis.Config
	Tracing  tracing.Config
	Metrics  metrics.Config
	Logging  logging.Config

	ZitadelBaseURL  string
	ZitadelIssuer   string
	ZitadelAudience string
	ZitadelClientID string
	ZitadelSecret   string
}

// FromEnv builds service config from environment variables.
func FromEnv() Config {
	env := envutil.String("ENVIRONMENT", "development")
	appName := "Know Foolery - Question Bank Service"
	serviceName := "question-bank-service"

	logCfg := logging.DefaultConfig()
	logCfg.ServiceName = serviceName
	logCfg.Environment = env
	logCfg.Level = envutil.String("LOG_LEVEL", logCfg.Level)

	traceCfg := tracing.ConfigFromEnv()
	if traceCfg.ServiceName == "knowfoolery" {
		traceCfg.ServiceName = serviceName
	}
	traceCfg.Environment = env

	metricsCfg := metrics.ConfigFromEnv()
	if metricsCfg.ServiceName == "knowfoolery" {
		metricsCfg.ServiceName = serviceName
	}

	return Config{
		AppName: appName,

		Port:       envutil.Int("QUESTION_BANK_PORT", 8081),
		Env:        env,
		LogLevel:   logCfg.Level,
		CacheTTL:   envutil.Duration("QUESTION_CACHE_TTL", 5*time.Minute),
		MaxExclude: envutil.Int("QUESTION_RANDOM_MAX_EXCLUSIONS", 200),
		BulkMax:    envutil.Int("QUESTION_BULK_MAX_ITEMS", 5000),

		Postgres: sharedpostgres.ConfigFromEnv(),
		Redis:    sharedredis.ConfigFromEnv(),
		Tracing:  traceCfg,
		Metrics:  metricsCfg,
		Logging:  logCfg,

		ZitadelBaseURL:  envutil.String("ZITADEL_URL", ""),
		ZitadelIssuer:   envutil.String("ZITADEL_ISSUER", ""),
		ZitadelAudience: envutil.String("ZITADEL_AUDIENCE", ""),
		ZitadelClientID: envutil.String("ZITADEL_CLIENT_ID", ""),
		ZitadelSecret:   envutil.String("ZITADEL_CLIENT_SECRET", ""),
	}
}