package config

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"

	"github.com/spf13/viper"
)

type AppConfig struct {
	AppEnv                 string
	AppPort                string
	LogLevel               string
	RedisAddr              string
	MySQLDSN               string
	PostgresDSN            string
	MongoDSN               string
	MinIoEndpoint          string
	MinioAccessKey         string
	MinioSecretKey         string
	MinioBucketName        string
	AsynqmonPort           string
	TotpViewPassword       string
	TotpViewHost           string
	TotpViewPort           string
	SimCardDingTalkWebhook string
	SimCardDingTalkSecret  string
}

type FwhApiConfig struct {
	FwhEnergy     string
	FwhOss        string
	FwhUser       string
	FwhPassword   string
	FwhTotpSecret string
}

type FwhMqttConfig struct {
	FwhMqttBroker  string
	FwhMqttCaUrl   string
	FwhMqttCertUrl string
	FwhMqttKeyUrl  string
}

// FwhEsConfig Elasticsearch(iotcore-stat) 连接配置
type FwhEsConfig struct {
	// EsHost 形如 "alb-prod.franklinwh.click:5603"（不含 scheme）
	EsHost string
	// EsUser / EsPassword basic auth 凭证
	EsUser     string
	EsPassword string
	// EsIndexPrefix 索引前缀，形如 "iotcore-stat"，
	// 实际索引名会拼接日期，如 "iotcore-stat-2026.09.07"
	EsIndexPrefix string
	// EsInsecureSkipVerify 是否跳过 TLS 证书校验（对应 curl -k）
	EsInsecureSkipVerify bool
}

type PlaneApiConfig struct {
	Host           string
	ApiKey         string
	WorkspaceSlug  string
	ProjectId      string
	LabelBugId     string
	LabelFeatureId string
}

type PlaneWebApiConfig struct {
	Host            string
	Email           string
	Password        string
	WorkspaceSlug   string
	ProjectId       string
	LabelBugId      string
	LabelFeatureId  string
	LabelFeedbackId string
}

// AgentConfig 新 AI 助手（AgentServer）配置，见 docs/ai-assistant-agentserver/technical-design.md §3.2
type AgentConfig struct {
	// Enabled 新 AI 助手总开关（AGENT_ENABLED）
	Enabled bool
	// ServerURL AgentServer 地址，如 http://127.0.0.1:8787（AGENT_SERVER_URL）
	ServerURL string
	// ApiKey AgentServer 签发的平台 API Key，只在后端使用（AGENT_SERVER_API_KEY）
	ApiKey string
	// ProfileDefault 默认 Profile ID（AGENT_PROFILE_DEFAULT），为空时使用 API Key 的默认 Profile
	ProfileDefault string
	// ProfileByRole 角色到 Profile 的映射，格式 "role:prf_x,role2:prf_y"，按顺序取第一个命中的（AGENT_PROFILE_BY_ROLE）
	ProfileByRole string
	// AllowedRoles 允许使用新助手的角色，逗号分隔；为空表示所有登录用户（AGENT_ALLOWED_ROLES）
	AllowedRoles string
}

type Config struct {
	App         AppConfig
	FwhApi      FwhApiConfig
	FwhTestApi  FwhApiConfig
	FwhMqtt     FwhMqttConfig
	FwhTestMqtt FwhMqttConfig
	FwhEs       FwhEsConfig
	PlaneApi    PlaneApiConfig
	PlaneWebApi PlaneWebApiConfig
	Agent       AgentConfig
}

// 需先执行LoadConfig后才能读取ENV
// var APP_ENV string = "dev"
// var FWH_ENERGY string = "energy.franklinwh.com"
// var FWH_OSS string = "oss.franklinwh.com"
// var FWH_USER string = ""
// var FWH_PASSWORD string = "" // The production API receives its MD5 digest.

// LoadConfig 读取配置文件和环境变量。
// 可选参数 configPaths 指定候选配置文件路径（按顺序尝试，命中第一个存在的即停）。
// 不传时使用默认路径 ["./.env", "./config.env"]（后端主服务用）。
// MCP 等独立进程可传入自己的配置文件，例如 LoadConfig("./config.agent-mcp.env")。
func LoadConfig(configPaths ...string) (*Config, error) {
	v := viper.New()

	// 默认值（避免缺省时崩溃）
	// APP
	v.SetDefault("APP_ENV", "dev")
	v.SetDefault("APP_PORT", "8080")
	v.SetDefault("REDIS_ADDR", "localhost:6379")
	v.SetDefault("MYSQL_DSN", "")
	v.SetDefault("POSTGRES_DSN", "host=localhost user=fwh_toolbox password=fwh_toolbox dbname=fwh_toolbox_db port=5432 sslmode=disable")
	v.SetDefault("MONGO_DSN", "mongodb://localhost:27017/FwhToolboxDbDev")
	v.SetDefault("MINIO_ENDPOINT", "localhost:9198")
	v.SetDefault("MINIO_ACCESS_KEY", "fwh-toolbox")
	v.SetDefault("MINIO_SECRET_KEY", "fwh-toolbox")
	v.SetDefault("MINIO_BUCKET_NAME", "fwh-toolbox")
	v.SetDefault("ASYNQMON_PORT", "8081")
	v.SetDefault("FWH_TOTP_VIEW_PORT", "8303")
	v.SetDefault("FWH_TOTP_VIEW_HOST", "127.0.0.1")
	// FWH API
	v.SetDefault("FWH_ENERGY", "energy.franklinwh.com")
	v.SetDefault("FWH_OSS", "oss.franklinwh.com")
	// FWH MQTT

	// FWH ES(iotcore-stat)
	v.SetDefault("FWH_ES_INDEX_PREFIX", "iotcore-stat")
	v.SetDefault("FWH_ES_INSECURE_SKIP_VERIFY", true)
	// 新 AI 助手（AgentServer）
	v.SetDefault("AGENT_ENABLED", false)
	v.SetDefault("AGENT_SERVER_URL", "http://127.0.0.1:8787")
	// 多文件路径支持：优先使用调用方传入的路径，否则回退默认
	paths := configPaths
	if len(paths) == 0 {
		paths = []string{"./.env", "./config.env"}
	}
	var readErr error
	for _, path := range paths {
		v.SetConfigFile(path)
		if err := v.ReadInConfig(); err == nil {
			fmt.Printf("✅ Using config file: %s\n", path)
			readErr = nil
			break
		} else {
			readErr = err
		}
	}

	// 环境变量覆盖文件配置
	v.AutomaticEnv()

	// 如果两个文件都没读到，也没关系，直接用默认值
	if readErr != nil {
		fmt.Println("⚠️ No config file found, using default values & environment variables")
	}

	// APP_ENV = v.GetString("APP_ENV")
	// FWH_ENERGY = v.GetString("FWH_ENERGY")
	// FWH_OSS = v.GetString("FWH_OSS")
	// FWH_USER = v.GetString("FWH_USER")
	// FWH_PASSWORD = v.GetString("FWH_PASSWORD")

	h := md5.New()
	h.Write([]byte(v.GetString("FWH_PASSWORD")))
	fwhApiPassword := hex.EncodeToString(h.Sum(nil))

	h = md5.New()
	h.Write([]byte(v.GetString("FWH_TEST_PASSWORD")))
	fwhTestApiPassword := hex.EncodeToString(h.Sum(nil))

	return &Config{
		App: AppConfig{
			AppEnv:                 v.GetString("APP_ENV"),
			AppPort:                v.GetString("APP_PORT"),
			LogLevel:               v.GetString("LOG_LEVEL"),
			RedisAddr:              v.GetString("REDIS_ADDR"),
			MySQLDSN:               v.GetString("MYSQL_DSN"),
			PostgresDSN:            v.GetString("POSTGRES_DSN"),
			MongoDSN:               v.GetString("MONGO_DSN"),
			MinIoEndpoint:          v.GetString("MINIO_ENDPOINT"),
			MinioAccessKey:         v.GetString("MINIO_ACCESS_KEY"),
			MinioSecretKey:         v.GetString("MINIO_SECRET_KEY"),
			MinioBucketName:        v.GetString("MINIO_BUCKET_NAME"),
			AsynqmonPort:           v.GetString("ASYNQMON_PORT"),
			TotpViewPassword:       v.GetString("FWH_TOTP_VIEW_PASSWORD"),
			TotpViewHost:           v.GetString("FWH_TOTP_VIEW_HOST"),
			TotpViewPort:           v.GetString("FWH_TOTP_VIEW_PORT"),
			SimCardDingTalkWebhook: v.GetString("SIM_CARD_DINGTALK_WEBHOOK"),
			SimCardDingTalkSecret:  v.GetString("SIM_CARD_DINGTALK_SECRET"),
		},
		FwhApi: FwhApiConfig{
			FwhEnergy:     v.GetString("FWH_ENERGY"),
			FwhOss:        v.GetString("FWH_OSS"),
			FwhUser:       v.GetString("FWH_USER"),
			FwhPassword:   fwhApiPassword,
			FwhTotpSecret: v.GetString("FWH_TOTP_SECRET"),
		},
		FwhTestApi: FwhApiConfig{
			FwhEnergy:   v.GetString("FWH_TEST_ENERGY"),
			FwhOss:      v.GetString("FWH_TEST_OSS"),
			FwhUser:     v.GetString("FWH_TEST_USER"),
			FwhPassword: fwhTestApiPassword,
		},
		FwhMqtt: FwhMqttConfig{
			FwhMqttBroker:  v.GetString("FWH_MQTT_BROKER"),
			FwhMqttCaUrl:   v.GetString("FWH_MQTT_CA"),
			FwhMqttCertUrl: v.GetString("FWH_MQTT_CERT"),
			FwhMqttKeyUrl:  v.GetString("FWH_MQTT_KEY"),
		},
		FwhTestMqtt: FwhMqttConfig{
			FwhMqttBroker:  v.GetString("FWH_MQTT_TEST_BROKER"),
			FwhMqttCaUrl:   v.GetString("FWH_MQTT_TEST_CA"),
			FwhMqttCertUrl: v.GetString("FWH_MQTT_TEST_CERT"),
			FwhMqttKeyUrl:  v.GetString("FWH_MQTT_TEST_KEY"),
		},
		FwhEs: FwhEsConfig{
			EsHost:               v.GetString("FWH_ES_HOST"),
			EsUser:               v.GetString("FWH_ES_USER"),
			EsPassword:           v.GetString("FWH_ES_PASSWORD"),
			EsIndexPrefix:        v.GetString("FWH_ES_INDEX_PREFIX"),
			EsInsecureSkipVerify: v.GetBool("FWH_ES_INSECURE_SKIP_VERIFY"),
		},
		PlaneApi: PlaneApiConfig{
			Host:           v.GetString("PLANE_HOST"),
			ApiKey:         v.GetString("PLANE_API_KEY"),
			WorkspaceSlug:  v.GetString("PLANE_WORKSPACE_SLUG"),
			ProjectId:      v.GetString("PLANE_PROJECT_ID"),
			LabelBugId:     v.GetString("PLANE_LABEL_BUG"),
			LabelFeatureId: v.GetString("PLANE_LABEL_FEATURE"),
		},
		PlaneWebApi: PlaneWebApiConfig{
			Host:            v.GetString("PLANE_WEB_HOST"),
			Email:           v.GetString("PLANE_WEB_EMAIL"),
			Password:        v.GetString("PLANE_WEB_PASSWORD"),
			WorkspaceSlug:   v.GetString("PLANE_WEB_WORKSPACE_SLUG"),
			ProjectId:       v.GetString("PLANE_WEB_PROJECT_ID"),
			LabelBugId:      v.GetString("PLANE_WEB_LABEL_BUG"),
			LabelFeatureId:  v.GetString("PLANE_WEB_LABEL_FEATURE"),
			LabelFeedbackId: v.GetString("PLANE_WEB_LABEL_FEEDBACK"),
		},
		Agent: AgentConfig{
			Enabled:        v.GetBool("AGENT_ENABLED"),
			ServerURL:      v.GetString("AGENT_SERVER_URL"),
			ApiKey:         v.GetString("AGENT_SERVER_API_KEY"),
			ProfileDefault: v.GetString("AGENT_PROFILE_DEFAULT"),
			ProfileByRole:  v.GetString("AGENT_PROFILE_BY_ROLE"),
			AllowedRoles:   v.GetString("AGENT_ALLOWED_ROLES"),
		},
	}, nil
}