// Package bridge 提供多用户小米设备管理门面。
//
// 外部只需 import 这一个包，无需直接依赖 xiaomi/devices/miot。
//
// 用法：
//
//	pool := bridge.NewPool()
//	pool.Add(ctx, id, uuid, auth, dataDir)
//	b, _ := pool.Get(id)
//	ac, _ := b.AC("did")
//	ac.TurnOn(ctx)
//	state := ac.GetState()
package bridge

import (
	"context"
	"fmt"
	"sync"

	"xiaomihome/logger"
	"xiaomihome/xiaomi"
	"xiaomihome/xiaomi/devices"
)

// ── 类型别名：业务层不需要 import devices ──

type (
	ACState          = devices.ACState
	LightState       = devices.LightState
	FanState         = devices.FanState
	HumidifierState  = devices.HumidifierState
	HeaterState      = devices.HeaterState
	VacuumStatus     = devices.VacuumStatus
)

// ── Pool ──

// Pool 全局路由：id → Bridge。
type Pool struct {
	mu    sync.RWMutex
	items map[int64]*Bridge
}

// NewPool 创建 Pool。
func NewPool() *Pool {
	return &Pool{items: make(map[int64]*Bridge)}
}

// Get 按 id 查找。
func (p *Pool) Get(id int64) (*Bridge, bool) {
	p.mu.RLock()
	defer p.mu.RUnlock()
	b, ok := p.items[id]
	return b, ok
}

// Add 新建并注册一个 Bridge。
func (p *Pool) Add(ctx context.Context, id int64, uuid string, auth xiaomi.AuthInfo, dataDir string, homeIDs []int64) (*Bridge, error) {
	p.mu.Lock()
	defer p.mu.Unlock()
	if _, exists := p.items[id]; exists {
		return nil, fmt.Errorf("bridge: %d already exists", id)
	}
	b, err := newBridge(ctx, id, uuid, auth, dataDir, homeIDs)
	if err != nil {
		return nil, err
	}
	p.items[id] = b
	return b, nil
}

// Remove 移除并关闭。
func (p *Pool) Remove(id int64) error {
	p.mu.Lock()
	b, ok := p.items[id]
	if ok {
		delete(p.items, id)
	}
	p.mu.Unlock()
	if !ok {
		return fmt.Errorf("bridge: %d not found", id)
	}
	return b.Close()
}

// Close 关闭所有。
func (p *Pool) Close() {
	p.mu.Lock()
	defer p.mu.Unlock()
	for id, b := range p.items {
		b.Close()
		delete(p.items, id)
	}
}

// ── Bridge ──

// Bridge 封装单个用户的 Client + 类型化设备控制器 + 状态缓存。
type Bridge struct {
	id     int64
	client *xiaomi.Client
	lgr    logger.Logger
	mu     sync.RWMutex
	dv     map[string]interface{} // DID → devices.Xxx interface

	onStateChanged func(id int64, did, deviceType, changed string, state interface{})
}

func newBridge(ctx context.Context, id int64, uuid string, auth xiaomi.AuthInfo, dataDir string, homeIDs []int64) (*Bridge, error) {
	idStr := fmt.Sprintf("%d", id)
	client, err := xiaomi.NewClient(ctx, xiaomi.Config{
		AuthInfo: auth,
		DataDir:  dataDir,
		UUID:     uuid,
		UID:      idStr,
		HomeIDs:  homeIDs,
	})
	if err != nil {
		return nil, fmt.Errorf("bridge: %w", err)
	}

	b := &Bridge{
		id:     id,
		client: client,
		lgr:    logger.Default(),
		dv:     make(map[string]interface{}),
	}

	devList, err := client.GetDevices(ctx)
	if err != nil {
		client.Close()
		return nil, fmt.Errorf("bridge: GetDevices: %w", err)
	}

	for _, info := range devList {
		d, createErr := devices.Create(client, info)
		if createErr != nil {
			continue
		}
		b.dv[info.DID] = d
	}

	b.lgr.Infof("[bridge] %d: %d devices", id, len(b.dv))
	return b, nil
}

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

func (b *Bridge) Close() error { return b.client.Close() }

// Devices 返回设备列表（DID → 类型名）。
func (b *Bridge) Devices() map[string]string {
	b.mu.RLock()
	defer b.mu.RUnlock()
	out := make(map[string]string, len(b.dv))
	for did, d := range b.dv {
		out[did] = deviceTypeName(d)
	}
	return out
}

func deviceTypeName(d interface{}) string {
	switch d.(type) {
	case devices.AirConditioner: return "air_conditioner"
	case devices.Light:          return "light"
	case devices.Switch:         return "switch"
	case devices.Fan:            return "fan"
	case devices.Cover:          return "cover"
	case devices.Humidifier:     return "humidifier"
	case devices.Vacuum:         return "vacuum"
	case devices.WaterHeater:    return "water_heater"
	case devices.Thermostat:     return "thermostat"
	case devices.TempHumiditySensor: return "temp_humidity_sensor"
	case devices.OccupancySensor: return "occupancy_sensor"
	case devices.Speaker: return "speaker"
	default: return "unknown"
	}
}

// ── 类型化设备访问器 ──

func (b *Bridge) AC(did string) (devices.AirConditioner, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	ac, ok := d.(devices.AirConditioner)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not an AirConditioner", did) }
	return ac, nil
}
func (b *Bridge) Light(did string) (devices.Light, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	lt, ok := d.(devices.Light)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Light", did) }
	return lt, nil
}
func (b *Bridge) Switch(did string) (devices.Switch, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	sw, ok := d.(devices.Switch)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Switch", did) }
	return sw, nil
}
func (b *Bridge) Fan(did string) (devices.Fan, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	f, ok := d.(devices.Fan)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Fan", did) }
	return f, nil
}
func (b *Bridge) Cover(did string) (devices.Cover, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	cv, ok := d.(devices.Cover)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Cover", did) }
	return cv, nil
}
func (b *Bridge) Humidifier(did string) (devices.Humidifier, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	h, ok := d.(devices.Humidifier)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Humidifier", did) }
	return h, nil
}
func (b *Bridge) Vacuum(did string) (devices.Vacuum, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	v, ok := d.(devices.Vacuum)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Vacuum", did) }
	return v, nil
}
func (b *Bridge) WaterHeater(did string) (devices.WaterHeater, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	wh, ok := d.(devices.WaterHeater)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a WaterHeater", did) }
	return wh, nil
}
func (b *Bridge) Thermostat(did string) (devices.Thermostat, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	t, ok := d.(devices.Thermostat)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Thermostat", did) }
	return t, nil
}
func (b *Bridge) TempHumidity(did string) (devices.TempHumiditySensor, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	s, ok := d.(devices.TempHumiditySensor)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a TempHumiditySensor", did) }
	return s, nil
}
func (b *Bridge) Occupancy(did string) (devices.OccupancySensor, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	s, ok := d.(devices.OccupancySensor)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not an OccupancySensor", did) }
	return s, nil
}
func (b *Bridge) Speaker(did string) (devices.Speaker, error) {
	d, ok := b.dv[did]
	if !ok { return nil, fmt.Errorf("bridge: device %s not found", did) }
	sp, ok := d.(devices.Speaker)
	if !ok { return nil, fmt.Errorf("bridge: device %s is not a Speaker", did) }
	return sp, nil
}