package config

import (
	"strconv"
	"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 leaderboard-service.
type Config struct {
	AppName string
	Port    int

	TopLimit             int
	PlayerHistoryDefault int
	PlayerHistoryMax     int
	CacheTTL             time.Duration
	UpdateRequireAuth    bool
	UpstreamHTTPTimeout  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 config from env vars.
func FromEnv() Config {
	env := envutil.String("ENVIRONMENT", "development")
	serviceName := "leaderboard-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 - Leaderboard Service",
		Port:                 envutil.Int("LEADERBOARD_PORT", 8083),
		TopLimit:             envutil.Int("LEADERBOARD_TOP_LIMIT", 10),
		PlayerHistoryDefault: envutil.Int("LEADERBOARD_PLAYER_HISTORY_DEFAULT_LIMIT", 20),
		PlayerHistoryMax:     envutil.Int("LEADERBOARD_PLAYER_HISTORY_MAX_LIMIT", 100),
		CacheTTL:             envutil.Duration("LEADERBOARD_CACHE_TTL", 60*time.Second),
		UpdateRequireAuth:    parseBool("LEADERBOARD_UPDATE_REQUIRE_AUTH", true),
		UpstreamHTTPTimeout:  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", ""),
	}
}

func parseBool(key string, fallback bool) bool {
	v := envutil.String(key, "")
	if v == "" {
		return fallback
	}
	parsed, err := strconv.ParseBool(v)
	if err != nil {
		return fallback
	}
	return parsed
}