package watcher

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

	"gitea.timerzz.com/kedaya_haitao/coach-spider/pkg/options"
	coach_client "gitea.timerzz.com/kedaya_haitao/common/pkg/coach-client"
	"gitea.timerzz.com/kedaya_haitao/common/structs/storage"
	v2 "gitea.timerzz.com/kedaya_haitao/common/structs/v2"
	"gitea.timerzz.com/kedaya_haitao/pusher/kitex_gen/push"
	"gitea.timerzz.com/kedaya_haitao/pusher/rpc/pusher"
	"github.com/golang/glog"
	"gorm.io/gorm"
)

type Controller struct {
	ctx context.Context
	m   sync.RWMutex

	// 要蹲货的ProviderArticle
	watchers *Watchers

	storage *storage.Storage
	client  coach_client.USClient

	providerId v2.ProviderId
	interval   time.Duration
}

func NewController(ctx context.Context, cfg *options.Config, client coach_client.USClient, db *gorm.DB) *Controller {
	return &Controller{
		ctx:        ctx,
		providerId: cfg.ProviderId,
		interval:   cfg.WatchInterval,
		client:     client,
		storage:    storage.NewStorage(db),
		watchers:   NewWatchers(storage.NewStorage(db), cfg.ProviderId),
	}
}

func (c *Controller) Run() (err error) {
	// 加载要蹲货的ProviderArticle
	if err = c.watchers.Load(); err != nil {
		return
	}
	ticker := time.NewTicker(c.interval)
	defer ticker.Stop()
	for {
		select {
		case <-c.ctx.Done():
			glog.Info("watcher 退出")
			return
		case <-ticker.C:
			c.watchRange()
		}
	}
}

// 返回ready
func (c *Controller) Ready() bool {
	return c.watchers.Ready()
}

// Add 添加一个要蹲货的ProviderArticle
func (c *Controller) Add(skuID string) error {
	article, err := c.storage.ProviderArticle().Get(storage.NewGetProviderArticleQuery().SetProviderId(c.providerId).SetSkuId(skuID))
	if err != nil {
		return fmt.Errorf("获取商品信息失败: %v", err)
	}
	article.SetWatch(true)
	article.Available = false
	if err = c.storage.ProviderArticle().Update(article, "watch", "available"); err != nil {
		return fmt.Errorf("更新数据库失败：%v", err)
	}
	c.watchers.Add(&article)
	return nil
}

func (c *Controller) Delete(skuID string) error {
	article, err := c.storage.ProviderArticle().Get(storage.NewGetProviderArticleQuery().SetProviderId(c.providerId).SetSkuId(skuID))
	if err != nil {
		return fmt.Errorf("获取商品信息失败: %v", err)
	}
	article.Watch = nil
	if err = c.storage.ProviderArticle().Update(article, "watch"); err != nil {
		return fmt.Errorf("更新数据库失败：%v", err)
	}
	c.watchers.Remove(skuID)
	return nil
}

func (c *Controller) Stop(skuID string) error {
	article, err := c.storage.ProviderArticle().Get(storage.NewGetProviderArticleQuery().SetProviderId(c.providerId).SetSkuId(skuID))
	if err != nil {
		return fmt.Errorf("获取商品信息失败: %v", err)
	}
	article.SetWatch(false)
	if err = c.storage.ProviderArticle().Update(article, "watch"); err != nil {
		return fmt.Errorf("更新数据库失败：%v", err)
	}
	c.watchers.Remove(skuID)
	return nil
}

func (c *Controller) watchRange() {
	c.watchers.Range(func(watcher *Watcher) bool {
		return !watcher.watching
	}, func(watcher *Watcher) {
		go func() {
			watcher.watching = true
			defer func() {
				watcher.watching = false
			}()

			if c.doWatch(watcher) {
				// 如果蹲到了，需要通知
				resp, err := pusher.Push(c.ctx, &push.PushReq{
					Title:   "coach 补货",
					Content: fmt.Sprintf("coach 商品 %s 补货\n库存：%d\n链接：%s", watcher.pArticle.SkuID, watcher.pArticle.Ats, watcher.pArticle.Link),
				})
				if err != nil {
					glog.Errorf("消息推送失败：%v", err)
				}
				if resp.Code != 0 {
					glog.Errorf("消息推送失败:%s", resp.Msg)
				}
				watcher.pArticle.SetWatch(false)
				_ = c.storage.ProviderArticle().Update(*watcher.pArticle, "watch")
				c.watchers.Remove(watcher.pArticle.SkuID)
			}
		}()
	})
}

func (c *Controller) doWatch(watcher *Watcher) (available bool) {
	article := watcher.pArticle
	inventory, err := c.client.RequestInventory(c.ctx, article.SkuID)
	if err != nil {
		glog.Warningf("获取coach %s 库存失败:%v", article.SkuID, err)
		return
	}
	article.Available = inventory.Orderable && inventory.Ats > 0
	article.Ats = inventory.Ats
	article.SetWatch(!article.Available)
	if err = c.storage.ProviderArticle().Update(*article, "available", "ats", "updated_at"); err != nil {
		glog.Errorf("更新数据库失败：%v", err)
		article.SetWatch(true)
		return
	}
	return article.Available

}