package xiaomi

import (
	"context"
	"fmt"
	"sync"
	"time"

	"xiaomihome/logger"
	"xiaomihome/miot"
)

// Client 高级封装客户端（包装 miot.MIoTClient + miot.MIoTHttpClient）
type Client struct {
	cfg        Config
	inner      *miot.MIoTClient
	http       *miot.MIoTHttpClient
	mipsCloud  *miot.MipsCloudClient
	specParser *miot.MIoTSpecParser
	uuid       string
	lgr        logger.Logger
	deviceMu   sync.RWMutex
	devices    map[string]*miot.MIoTDevice

	propSubs  map[string]string
	eventSubs map[string]string
	mu        sync.RWMutex

	readbackModels map[string]struct{} // 需要 set 后回读的型号集合
}

// NewClient 创建并初始化客户端。
func NewClient(ctx context.Context, cfg Config) (*Client, error) {
	if cfg.AuthInfo.AccessToken == "" {
		return nil, fmt.Errorf("xiaomi: Config.AuthInfo.AccessToken is required")
	}
	if cfg.UUID == "" {
		return nil, fmt.Errorf("xiaomi: Config.UUID is required")
	}

	if cfg.DataDir == "" {
		cfg.DataDir = "./data"
	}

	// 计算 expires_ts（如果未提供，从 expires_in 推算）
	expiresTS := float64(cfg.AuthInfo.ExpiresTS)
	if expiresTS == 0 && cfg.AuthInfo.ExpiresIn > 0 {
		expiresTS = float64(time.Now().Unix() + int64(cfg.AuthInfo.ExpiresIn))
	}

	uuid := cfg.UUID
	entryData := map[string]interface{}{
		"access_token":  cfg.AuthInfo.AccessToken,
		"refresh_token": cfg.AuthInfo.RefreshToken,
		"expires_ts":    expiresTS,
		"uuid":          uuid,
	}

	miotClient := miot.NewMIoTClient("xiaomi_sdk", entryData, cfg.UID, "cn", miot.CtrlModeAuto)
	miotClient.SetStorage(miot.NewMIoTStorage(cfg.DataDir))
	miotClient.SetSpecParser(miot.NewMIoTSpecParser("en", miot.NewMIoTStorage(cfg.DataDir), cfg.DataDir+"/specs"))

	httpClient, err := miot.NewMIoTHttpClient("cn", miot.OAUTH2_CLIENT_ID, cfg.AuthInfo.AccessToken)
	if err != nil {
		return nil, fmt.Errorf("xiaomi: http: %w", err)
	}
	miotClient.SetHTTPClient(httpClient)

	mipsCloud := miot.NewMipsCloudClient(
		"ssl://cn-ha.mqtt.io.mi.com:8883",
		"ha."+uuid,
		miot.OAUTH2_CLIENT_ID,
		cfg.AuthInfo.AccessToken,
	)
	miotClient.SetMipsCloud(mipsCloud)

	var ids []string
	if len(cfg.HomeIDs) > 0 {
		ids = make([]string, len(cfg.HomeIDs))
		for i, v := range cfg.HomeIDs {
			ids[i] = fmt.Sprintf("%d", v)
		}
		miotClient.SetHomeIDs(ids)
	}

	if err := miotClient.Init(); err != nil {
		return nil, fmt.Errorf("xiaomi: init: %w", err)
	}

	// Use the same homeIDs slice from above (nil if not set)
	_ = miotClient.RefreshDevices(ids)

	if err := mipsCloud.Connect(); err != nil {
		return nil, fmt.Errorf("xiaomi: mips connect: %w", err)
	}

	c := &Client{
		cfg:        cfg,
		inner:      miotClient,
		http:       httpClient,
		mipsCloud:  mipsCloud,
		uuid:       uuid,
		lgr:        logger.Default(),
		specParser: miot.NewMIoTSpecParser("en", miot.NewMIoTStorage(cfg.DataDir), cfg.DataDir+"/specs"),
		devices:    make(map[string]*miot.MIoTDevice),
		propSubs:  make(map[string]string),
		eventSubs: make(map[string]string),
		readbackModels: make(map[string]struct{}, len(cfg.ReadbackModels)),
	}
	for _, m := range cfg.ReadbackModels {
		if m != "" {
			c.readbackModels[m] = struct{}{}
		}
	}
	return c, nil
}

// NeedReadback 判断指定型号是否需要"set 成功后回读状态"。
func (c *Client) NeedReadback(model string) bool {
	if model == "" || len(c.readbackModels) == 0 {
		return false
	}
	_, ok := c.readbackModels[model]
	return ok
}

// SetLogger 设置日志记录器。
func (c *Client) SetLogger(l logger.Logger) { c.lgr = l }

// Logger 返回日志记录器。
func (c *Client) Logger() logger.Logger { return c.lgr }

// SetHomeIDs 动态设置 miot 层的家庭过滤，供后台定时 RefreshDevices 使用。
func (c *Client) SetHomeIDs(homeIDs []string) { c.inner.SetHomeIDs(homeIDs) }

// Close 关闭客户端。
func (c *Client) Close() error {
	if c.mipsCloud != nil {
		c.mipsCloud.Disconnect()
	}
	if c.inner != nil {
		return c.inner.Deinit()
	}
	return nil
}

// RefreshToken 手动刷新 token，返回新值供调用方持久化。
func (c *Client) RefreshToken(ctx context.Context) (*TokenResult, error) {
	result, err := c.inner.RefreshAuthInfo()
	if err != nil {
		return nil, fmt.Errorf("xiaomi: refresh token: %w", err)
	}
	return &TokenResult{
		AccessToken:  strVal(result, "access_token"),
		RefreshToken: strVal(result, "refresh_token"),
		ExpiresIn:    int32(intVal(result, "expires_in")),
		ExpiresTS:    int64(intVal(result, "expires_ts")),
		UID:          strVal(result, "uid"),
	}, nil
}

func (c *Client) getOrCreateDevice(did string, info map[string]interface{}) *miot.MIoTDevice {
	c.deviceMu.Lock()
	defer c.deviceMu.Unlock()
	if dev, ok := c.devices[did]; ok {
		return dev
	}

	urn, _ := info["urn"].(string)
	model, _ := info["model"].(string)
	var spec *miot.MIoTSpecInstance
	if c.specParser != nil && urn != "" {
		s, err := c.specParser.Parse(urn, model)
		if err == nil {
			spec = s
		} else {
			c.lgr.Warnf("[xiaomi] spec parse failed for %s (%s): %v", did, urn, err)
		}
	}

	dev := miot.NewMIoTDevice(c.inner, info, spec)
	c.devices[did] = dev
	return dev
}

func (c *Client) getDevice(did string) *miot.MIoTDevice {
	c.deviceMu.RLock()
	defer c.deviceMu.RUnlock()
	return c.devices[did]
}