package config

import (
	"net/http"
	"strings"
	"time"

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

// Config 描述 notice-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"`
	// HealthHTTPAddr 给 CLB/发布脚本探活使用，不承载业务 HTTP。
	HealthHTTPAddr string `yaml:"health_http_addr"`
	// MySQLDSN 是 notice-service 自己的投递位点和死信状态库。
	MySQLDSN string `yaml:"mysql_dsn"`
	// WalletDatabase 是 wallet_outbox 所在库名；notice 只把它当 append-only 事实源读取。
	WalletDatabase string `yaml:"wallet_database"`
	// RoomDatabase 是 room_outbox 所在库名；notice 只读取需要私有通知的房间事实。
	RoomDatabase string `yaml:"room_database"`
	// TencentIM 是私有 IM 投递通道配置；本地默认关闭，避免误发真实消息。
	TencentIM TencentIMConfig `yaml:"tencent_im"`
	// WalletNoticeWorker 消费 wallet_outbox 中的 WalletBalanceChanged 事件。
	WalletNoticeWorker WalletNoticeWorkerConfig `yaml:"wallet_notice_worker"`
	// RoomNoticeWorker 消费 room_outbox 中需要给单个用户发送的房间通知。
	RoomNoticeWorker WalletNoticeWorkerConfig `yaml:"room_notice_worker"`
	MySQLAutoMigrate bool                     `yaml:"mysql_auto_migrate"`
	Log              logx.Config              `yaml:"log"`
}

// TencentIMConfig 描述服务端调用腾讯云 IM REST API 的配置。
type TencentIMConfig struct {
	Enabled         bool          `yaml:"enabled"`
	SDKAppID        int64         `yaml:"sdk_app_id"`
	SecretKey       string        `yaml:"secret_key"`
	AdminIdentifier string        `yaml:"admin_identifier"`
	AdminUserSigTTL time.Duration `yaml:"admin_user_sig_ttl"`
	Endpoint        string        `yaml:"endpoint"`
	RequestTimeout  time.Duration `yaml:"request_timeout"`
}

// RESTConfig converts YAML config into shared Tencent IM REST config.
func (c TencentIMConfig) RESTConfig() tencentim.RESTConfig {
	timeout := c.RequestTimeout
	if timeout <= 0 {
		timeout = 5 * time.Second
	}
	return tencentim.RESTConfig{
		SDKAppID:        c.SDKAppID,
		SecretKey:       c.SecretKey,
		AdminIdentifier: c.AdminIdentifier,
		AdminUserSigTTL: c.AdminUserSigTTL,
		Endpoint:        c.Endpoint,
		HTTPClient:      &http.Client{Timeout: timeout},
	}
}

// WalletNoticeWorkerConfig 控制钱包私有通知投递 worker。
type WalletNoticeWorkerConfig struct {
	Enabled        bool          `yaml:"enabled"`
	PollInterval   time.Duration `yaml:"poll_interval"`
	BatchSize      int           `yaml:"batch_size"`
	LockTTL        time.Duration `yaml:"lock_ttl"`
	PublishTimeout time.Duration `yaml:"publish_timeout"`
	MaxRetryCount  int           `yaml:"max_retry_count"`
	InitialBackoff time.Duration `yaml:"initial_backoff"`
	MaxBackoff     time.Duration `yaml:"max_backoff"`
}

// Default 返回本地开发默认配置。
func Default() Config {
	return Config{
		ServiceName:      "notice-service",
		NodeID:           "notice-local",
		Environment:      "local",
		GRPCAddr:         ":13009",
		HealthHTTPAddr:   ":13109",
		MySQLDSN:         "hyapp:hyapp@tcp(127.0.0.1:23306)/hyapp_notice?parseTime=true&charset=utf8mb4&loc=UTC",
		WalletDatabase:   "hyapp_wallet",
		RoomDatabase:     "hyapp_room",
		MySQLAutoMigrate: false,
		TencentIM: TencentIMConfig{
			Enabled:         false,
			AdminIdentifier: "administrator",
			AdminUserSigTTL: 24 * time.Hour,
			Endpoint:        tencentim.DefaultEndpoint,
			RequestTimeout:  5 * time.Second,
		},
		WalletNoticeWorker: WalletNoticeWorkerConfig{
			Enabled:        false,
			PollInterval:   time.Second,
			BatchSize:      100,
			LockTTL:        30 * time.Second,
			PublishTimeout: 3 * time.Second,
			MaxRetryCount:  10,
			InitialBackoff: 5 * time.Second,
			MaxBackoff:     5 * time.Minute,
		},
		RoomNoticeWorker: WalletNoticeWorkerConfig{
			Enabled:        false,
			PollInterval:   time.Second,
			BatchSize:      100,
			LockTTL:        30 * time.Second,
			PublishTimeout: 3 * time.Second,
			MaxRetryCount:  10,
			InitialBackoff: 5 * time.Second,
			MaxBackoff:     5 * time.Minute,
		},
		Log: logx.Config{
			Level:           "info",
			Format:          "json",
			MaxPayloadBytes: 2048,
		},
	}
}

// Load 从独立 config.yaml 读取 notice-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
	}
	cfg.ServiceName = strings.TrimSpace(cfg.ServiceName)
	if cfg.ServiceName == "" {
		cfg.ServiceName = "notice-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"
	}
	cfg.GRPCAddr = strings.TrimSpace(cfg.GRPCAddr)
	if cfg.GRPCAddr == "" {
		cfg.GRPCAddr = ":13009"
	}
	cfg.HealthHTTPAddr = strings.TrimSpace(cfg.HealthHTTPAddr)
	if cfg.HealthHTTPAddr == "" {
		cfg.HealthHTTPAddr = ":13109"
	}
	cfg.WalletDatabase = strings.TrimSpace(cfg.WalletDatabase)
	if cfg.WalletDatabase == "" {
		cfg.WalletDatabase = "hyapp_wallet"
	}
	cfg.RoomDatabase = strings.TrimSpace(cfg.RoomDatabase)
	if cfg.RoomDatabase == "" {
		cfg.RoomDatabase = "hyapp_room"
	}
	cfg.WalletNoticeWorker = normalizeWalletNoticeWorker(cfg.WalletNoticeWorker)
	cfg.RoomNoticeWorker = normalizeWalletNoticeWorker(cfg.RoomNoticeWorker)
	if strings.TrimSpace(cfg.TencentIM.AdminIdentifier) == "" {
		cfg.TencentIM.AdminIdentifier = "administrator"
	}
	if cfg.TencentIM.AdminUserSigTTL <= 0 {
		cfg.TencentIM.AdminUserSigTTL = 24 * time.Hour
	}
	if strings.TrimSpace(cfg.TencentIM.Endpoint) == "" {
		cfg.TencentIM.Endpoint = tencentim.DefaultEndpoint
	}
	if cfg.TencentIM.RequestTimeout <= 0 {
		cfg.TencentIM.RequestTimeout = 5 * time.Second
	}
	return cfg, nil
}

func normalizeWalletNoticeWorker(cfg WalletNoticeWorkerConfig) WalletNoticeWorkerConfig {
	def := Default().WalletNoticeWorker
	if cfg.PollInterval <= 0 {
		cfg.PollInterval = def.PollInterval
	}
	if cfg.BatchSize <= 0 {
		cfg.BatchSize = def.BatchSize
	}
	if cfg.LockTTL <= 0 {
		cfg.LockTTL = def.LockTTL
	}
	if cfg.PublishTimeout <= 0 {
		cfg.PublishTimeout = def.PublishTimeout
	}
	if cfg.MaxRetryCount <= 0 {
		cfg.MaxRetryCount = def.MaxRetryCount
	}
	if cfg.InitialBackoff <= 0 {
		cfg.InitialBackoff = def.InitialBackoff
	}
	if cfg.MaxBackoff <= 0 {
		cfg.MaxBackoff = def.MaxBackoff
	}
	return cfg
}