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 configuration for game-session-service.
type Config struct {
	AppName string

	Port               int
	Env                string
	LogLevel           string
	SessionDuration    time.Duration
	MaxAttempts        int
	MinAnswerLatencyMs int
	LockTTL            time.Duration
	ActiveKeyTTL       time.Duration
	EndReasonDefault   string

	QuestionBankBaseURL string
	UserServiceBaseURL  string
	UpstreamTimeout     time.Duration

	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 configuration from environment variables.
func FromEnv() Config {
	env := envutil.String("ENVIRONMENT", "development")
	appName := "Know Foolery - Game Session Service"
	serviceName := "game-session-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("GAME_SESSION_PORT", 8080),
		Env:                env,
		LogLevel:           logCfg.Level,
		SessionDuration:    envutil.Duration("GAME_SESSION_DURATION", 30*time.Minute),
		MaxAttempts:        envutil.Int("GAME_SESSION_MAX_ATTEMPTS", 3),
		MinAnswerLatencyMs: envutil.Int("GAME_SESSION_MIN_ANSWER_LATENCY_MS", 300),
		LockTTL:            envutil.Duration("GAME_SESSION_LOCK_TTL", 3*time.Second),
		ActiveKeyTTL:       envutil.Duration("GAME_SESSION_ACTIVE_KEY_TTL", 35*time.Minute),
		EndReasonDefault:   envutil.String("GAME_SESSION_END_REASON_DEFAULT", "abandoned"),

		QuestionBankBaseURL: envutil.String("QUESTION_BANK_BASE_URL", "http://localhost:8081"),
		UserServiceBaseURL:  envutil.String("USER_SERVICE_BASE_URL", "http://localhost:8082"),
		UpstreamTimeout:     envutil.Duration("UPSTREAM_HTTP_TIMEOUT", 3*time.Second),

		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", ""),
	}
}