package config

import (
	"time"

	sharedpostgres "knowfoolery/backend/shared/infra/database/postgres"
	"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 configuration for admin-service.
type Config struct {
	AppName string
	Port    int

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

	ZitadelBaseURL  string
	ZitadelIssuer   string
	ZitadelAudience string
	ZitadelClientID string
	ZitadelSecret   string

	AuditRetentionDays int
	HTTPTimeout        time.Duration
}

// FromEnv builds config from env vars.
func FromEnv() Config {
	env := envutil.String("ENVIRONMENT", "development")
	serviceName := "admin-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:            "Know Foolery - Admin Service",
		Port:               envutil.Int("ADMIN_SERVICE_PORT", 8085),
		Postgres:           sharedpostgres.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", ""),
		AuditRetentionDays: envutil.Int("ADMIN_AUDIT_RETENTION_DAYS", 90),
		HTTPTimeout:        envutil.Duration("UPSTREAM_HTTP_TIMEOUT", 3*time.Second),
	}
}