package config

import (
	"strings"

	"hyapp/pkg/configx"
	"hyapp/pkg/logx"
)

// Config 描述 activity-service 启动配置。
type Config struct {
	ServiceName string `yaml:"service_name"`
	NodeID      string `yaml:"node_id"`
	Environment string `yaml:"environment"`
	GRPCAddr    string `yaml:"grpc_addr"`
	// MySQLDSN 是活动状态、事件消费幂等和 outbox 的必需存储连接串。
	MySQLDSN string `yaml:"mysql_dsn"`
	// UserServiceAddr 是 fanout worker 读取目标用户游标的内部 gRPC 地址。
	UserServiceAddr string `yaml:"user_service_addr"`
	// MySQLAutoMigrate 保留给显式本地迁移；线上 schema 由发布流程或 initdb 管理。
	MySQLAutoMigrate bool               `yaml:"mysql_auto_migrate"`
	Consumer         ConsumerConfig     `yaml:"consumer"`
	MessageInbox     MessageInboxConfig `yaml:"message_inbox"`
	Log              logx.Config        `yaml:"log"`
}

// ConsumerConfig 保存 room outbox 消费底座配置。
type ConsumerConfig struct {
	RoomOutboxPollIntervalMs int64 `yaml:"room_outbox_poll_interval_ms"`
	BatchSize                int   `yaml:"batch_size"`
}

// MessageInboxConfig 保存 App system/activity inbox 的缓存和 fanout worker 参数。
type MessageInboxConfig struct {
	UnreadCacheTTL string                    `yaml:"unread_cache_ttl"`
	FanoutWorker   MessageFanoutWorkerConfig `yaml:"fanout_worker"`
}

// MessageFanoutWorkerConfig 描述后台消息 fanout worker 的 claim、批量和重试策略。
type MessageFanoutWorkerConfig struct {
	Enabled      bool   `yaml:"enabled"`
	PollInterval string `yaml:"poll_interval"`
	BatchSize    int    `yaml:"batch_size"`
	LockTTL      string `yaml:"lock_ttl"`
	MaxRetry     int    `yaml:"max_retry"`
}

// Default 返回本地默认配置。
func Default() Config {
	return Config{
		ServiceName:      "activity-service",
		NodeID:           "activity-local",
		Environment:      "local",
		GRPCAddr:         ":13006",
		MySQLDSN:         "hyapp:hyapp@tcp(127.0.0.1:23306)/hyapp_activity?parseTime=true&charset=utf8mb4&loc=Local",
		UserServiceAddr:  "127.0.0.1:13005",
		MySQLAutoMigrate: false,
		Consumer: ConsumerConfig{
			RoomOutboxPollIntervalMs: 1000,
			BatchSize:                100,
		},
		MessageInbox: MessageInboxConfig{
			UnreadCacheTTL: "60s",
			FanoutWorker: MessageFanoutWorkerConfig{
				Enabled:      true,
				PollInterval: "1s",
				BatchSize:    500,
				LockTTL:      "30s",
				MaxRetry:     8,
			},
		},
		Log: logx.Config{
			Level:           "info",
			Format:          "json",
			MaxPayloadBytes: 2048,
		},
	}
}

// Load 从独立 config.yaml 读取 activity-service 配置。
func Load(path string) (Config, error) {
	cfg := Default()
	if path == "" {
		return cfg, nil
	}

	if err := configx.LoadYAML(path, &cfg); err != nil {
		return Config{}, err
	}
	if strings.TrimSpace(cfg.UserServiceAddr) == "" {
		cfg.UserServiceAddr = Default().UserServiceAddr
	}
	cfg.ServiceName = strings.TrimSpace(cfg.ServiceName)
	if cfg.ServiceName == "" {
		cfg.ServiceName = "activity-service"
	}
	cfg.NodeID = strings.TrimSpace(cfg.NodeID)
	if cfg.NodeID == "" {
		cfg.NodeID = cfg.ServiceName
	}
	cfg.Environment = strings.ToLower(strings.TrimSpace(cfg.Environment))
	if cfg.Environment == "" {
		cfg.Environment = "local"
	}

	return cfg, nil
}