package config

import (
	"log"
	"net"
	"os"
	"strings"
	"time"

	ftsService "bsm/full/module/base/fts/service"
	mgtService "bsm/full/module/base/mgt/service"
	passportService "bsm/full/module/base/passport/service"
	senderService "bsm/full/module/base/sender/service"
	walletService "bsm/full/module/finance/wallet/service"
	"git.apinb.com/bsm-sdk/core/conf"
	"git.apinb.com/bsm-sdk/core/env"
	"git.apinb.com/bsm-sdk/core/printer"
	coreVars "git.apinb.com/bsm-sdk/core/vars"
)

// SrvConfig is the ecmall aggregate configuration. It only carries the
// services registered by pkgs/ecmall: the e-commerce domain (address, mall,
// market, order), the payment domain (wallet), the platform domain (ads, cms,
// feedback, fts, logs, mgt) and the base support services they rely on
// (initial, passport, sender). Modules that are not part of ecmall keep their
// own configuration in their own process.
type SrvConfig struct {
	conf.Base     `yaml:",inline"`
	Server        ServerConfig            `yaml:"Server"`
	Authorization AuthorizationConfig     `yaml:"Authorization"`
	Databases     *conf.DBConf            `yaml:"Databases"`
	MicroService  *conf.MicroServiceConf  `yaml:"MicroService"`
	Rpc           map[string]conf.RpcConf `yaml:"Rpc"`
	Apm           *conf.ApmConf           `yaml:"APM"`
	Etcd          *conf.EtcdConf          `yaml:"Etcd"`
	Services      []string                `yaml:"Services"`
	Fts           *ftsService.Config      `yaml:"Fts"`
	Mgt           *mgtService.Config      `yaml:"Mgt"`
	Passport      *passportService.Config `yaml:"Passport"`
	Sender        *senderService.Config   `yaml:"Sender"`
	Wallet        *walletService.Config   `yaml:"Wallet"`
}

type ListenerConfig struct {
	BindIP string `yaml:"BindIP"`
	Port   string `yaml:"Port"`
	Addr   string `yaml:"-"`
}

type ServerConfig struct {
	GRPC ListenerConfig `yaml:"GRPC"`
	HTTP ListenerConfig `yaml:"HTTP"`
}

type AuthorizationConfig struct {
	Key       string   `yaml:"Key"`
	Expire    int64    `yaml:"Expire"`
	Anonymous []string `yaml:"Anonymous"`
}

var Spec SrvConfig

// publicJwtSecretKeys 是仓库中出现过的公开 JWT 密钥字面量，绝不允许被当作有效签名密钥使用：
//   - CHANGE_ME_32_BYTE_JWT_SECRET_KEY：历史样例值（恰好 32 字节，能通过长度校验）；
//   - Cblocksmesh2022C：bsm-sdk env.NewEnv() 的内置默认值（SDK 不可改，只能在此拒绝）。
var publicJwtSecretKeys = map[string]struct{}{
	"CHANGE_ME_32_BYTE_JWT_SECRET_KEY": {},
	"Cblocksmesh2022C":                 {},
}

// publicSessionSecret 是 session cookie HMAC 密钥的公开占位值。
const publicSessionSecret = "CHANGE_ME"

func New(serviceKey string) {
	conf.New(serviceKey, &Spec)
	normalizeListener(&Spec.Server.GRPC)
	normalizeListener(&Spec.Server.HTTP)
	if Spec.Server.GRPC.Addr == Spec.Server.HTTP.Addr {
		panic("gRPC and HTTP listeners must use different addresses")
	}
	// JWT 是全系统身份凭据，签名密钥必须由部署显式提供：优先取 BSM_JwtSecretKey 环境变量，
	// 空值与公开样例值一律拒绝启动，避免默认配置直接上线后被用于伪造任意身份。
	if envKey := strings.TrimSpace(os.Getenv("BSM_JwtSecretKey")); envKey != "" {
		Spec.Authorization.Key = envKey
	}
	Spec.Authorization.Key = strings.TrimSpace(Spec.Authorization.Key)
	if Spec.Authorization.Key == "" {
		log.Fatalln("ERROR: JWT secret is not configured; provide it through the BSM_JwtSecretKey environment variable")
	}
	if _, isPublic := publicJwtSecretKeys[Spec.Authorization.Key]; isPublic {
		log.Fatalln("ERROR: JWT secret is a public sample value; provide a private key through the BSM_JwtSecretKey environment variable")
	}
	keyLength := len(Spec.Authorization.Key)
	if keyLength != 16 && keyLength != 24 && keyLength != 32 {
		log.Fatalln("ERROR: JWT secret must contain 16, 24, or 32 bytes")
	}
	if Spec.Authorization.Expire <= 0 {
		panic("Authorization.Expire must be greater than zero")
	}
	// session cookie 的 HMAC 密钥同样不得为空或公开占位值。
	sessionSecret := strings.TrimSpace(Spec.SecretKey)
	if sessionSecret == "" || sessionSecret == publicSessionSecret {
		log.Fatalln("ERROR: SecretKey must not be empty or a public placeholder; provide a private secret through the BSM_SECRET_KEY environment variable")
	}
	env.NewEnv().JwtSecretKey = Spec.Authorization.Key
	coreVars.JwtExpire = time.Duration(Spec.Authorization.Expire) * time.Second
	// Keep the embedded base address meaningful for module configurations that
	// still consume it, while ecmall itself uses the two explicit listeners.
	Spec.BindIP, Spec.Port, Spec.Addr = Spec.Server.HTTP.BindIP, Spec.Server.HTTP.Port, Spec.Server.HTTP.Addr
	conf.NotNil(Spec.Service, Spec.Cache)
	assignSharedConfig()
	conf.PrintInfo(Spec.Server.GRPC.Addr)
	printer.Info("gRPC Address: %s", Spec.Server.GRPC.Addr)
	printer.Info("HTTP Address: %s", Spec.Server.HTTP.Addr)
}

func normalizeListener(listener *ListenerConfig) {
	listener.Port = conf.CheckPort(listener.Port)
	listener.BindIP = conf.CheckIP(listener.BindIP)
	listener.Addr = net.JoinHostPort(listener.BindIP, listener.Port)
}

func assignSharedConfig() {
	if Spec.Fts != nil {
		Spec.Fts.Base, Spec.Fts.Databases, Spec.Fts.Rpc, Spec.Fts.Apm, Spec.Fts.Etcd = Spec.Base, Spec.Databases, Spec.Rpc, Spec.Apm, Spec.Etcd
	}
	if Spec.Mgt != nil {
		Spec.Mgt.Base, Spec.Mgt.Databases, Spec.Mgt.Rpc, Spec.Mgt.Apm, Spec.Mgt.Etcd = Spec.Base, Spec.Databases, Spec.Rpc, Spec.Apm, Spec.Etcd
	}
	if Spec.Passport != nil {
		Spec.Passport.Base, Spec.Passport.Databases, Spec.Passport.MicroService, Spec.Passport.Rpc, Spec.Passport.Apm, Spec.Passport.Etcd = Spec.Base, Spec.Databases, Spec.MicroService, Spec.Rpc, Spec.Apm, Spec.Etcd
	}
	if Spec.Sender != nil {
		Spec.Sender.Base, Spec.Sender.Databases, Spec.Sender.MicroService, Spec.Sender.Rpc, Spec.Sender.Apm, Spec.Sender.Etcd = Spec.Base, Spec.Databases, Spec.MicroService, Spec.Rpc, Spec.Apm, Spec.Etcd
	}
	if Spec.Wallet != nil {
		Spec.Wallet.Base, Spec.Wallet.Databases, Spec.Wallet.MicroService, Spec.Wallet.Rpc, Spec.Wallet.Apm, Spec.Wallet.Etcd = Spec.Base, Spec.Databases, Spec.MicroService, Spec.Rpc, Spec.Apm, Spec.Etcd
	}
}

func Enabled(name string) bool {
	if raw := strings.TrimSpace(os.Getenv("BSM_SERVICES")); raw != "" {
		for _, selected := range strings.Split(raw, ",") {
			if strings.EqualFold(strings.TrimSpace(selected), name) || strings.EqualFold(strings.TrimSpace(selected), "all") {
				return true
			}
		}
		return false
	}
	for _, service := range Spec.Services {
		if strings.EqualFold(strings.TrimSpace(service), name) || strings.EqualFold(strings.TrimSpace(service), "all") {
			return true
		}
	}
	return false
}