package ats_tracer

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

	// 要追踪的ProviderArticle
	tracers *Tracers

	storage *storage.Storage
	client  *coach_client.US

	providerId v2.ProviderId
	interval   time.Duration
	threshold  int
}

func NewController(ctx context.Context, cfg *options.Config, client *coach_client.US, db *gorm.DB) *Controller {
	return &Controller{
		ctx:        ctx,
		providerId: cfg.ProviderId,
		interval:   cfg.AtsInterval,
		threshold:  cfg.AtsThreshold,
		client:     client,
		storage:    storage.NewStorage(db),
		tracers:    NewTracers(storage.NewStorage(db), cfg.ProviderId),
	}
}

func (c *Controller) Run() (err error) {
	// 加载要追踪的ProviderArticle
	if err = c.tracers.Load(); err != nil {
		return
	}
	ticker := time.NewTicker(c.interval)
	defer ticker.Stop()
	for {
		select {
		case <-c.ctx.Done():
			glog.Infof("tracer退出")
			return
		case <-ticker.C:
			c.traceRange()
		}
	}
}

// 清理24小时前的ProviderAts
func (c *Controller) CleanAts() error {
	ticker := time.NewTicker(24 * time.Hour)
	defer ticker.Stop()
	for {
		select {
		case <-c.ctx.Done():
			glog.Infof("cleaner退出")
			return nil
		case <-ticker.C:
			c.storage.DB().Delete(v2.ProviderAts{}, "created_at < ?", time.Now().Add(-24*time.Hour))
		}
	}
}

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

// Add 添加一个要追踪库存的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.SetTraceAts(true)
	article.Available = false
	if err = c.storage.ProviderArticle().Update(article, "trace_ats", "available"); err != nil {
		return fmt.Errorf("更新数据库失败：%v", err)
	}
	c.tracers.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.TraceAts = nil
	if err = c.storage.ProviderArticle().Update(article, "trace_ats"); err != nil {
		return fmt.Errorf("更新数据库失败：%v", err)
	}
	c.tracers.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.SetTraceAts(false)
	if err = c.storage.ProviderArticle().Update(article, "trace_ats"); err != nil {
		return fmt.Errorf("更新数据库失败：%v", err)
	}
	c.tracers.Remove(skuID)
	return nil
}

func (c *Controller) traceRange() {
	c.tracers.Range(func(tracer *Tracer) bool {
		return !tracer.tracing
	}, func(tracer *Tracer) {
		go func() {
			tracer.tracing = true
			defer func() {
				tracer.tracing = false
			}()

			if c.doTrace(tracer) {
				//如果蹲到了，需要通知
				resp, err := pusher.Push(c.ctx, &push.PushReq{
					Title:   "coach 断货",
					Content: fmt.Sprintf("coach 商品 %s 断货了\n库存为0\n链接：%s", tracer.pArticle.SkuID, tracer.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)
				}
				tracer.pArticle.SetTraceAts(false)
				_ = c.storage.ProviderArticle().Update(*tracer.pArticle, "trace_ats")
				c.tracers.Remove(tracer.pArticle.SkuID)
			}
		}()
	})
}

func (c *Controller) doTrace(tracer *Tracer) (available bool) {
	article := tracer.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
	if article.Ats == 0 {
		article.SetTraceAts(false)
	}

	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.SetTraceAts(true)
		return
	}
	if article.Ats != tracer.lastAts {
		if value := tracer.lastAts - article.Ats; value >= c.threshold {
			_, _ = pusher.Push(c.ctx, &push.PushReq{
				Title:   "coach 商品库存减少",
				Content: fmt.Sprintf("coach 商品 %s %s 减少了 %d，当前库存：%d \n链接：%s", tracer.pArticle.SkuID, time.Now().Sub(tracer.lastTraceTime).String(), value, article.Ats, tracer.pArticle.Link),
			})
		}
		c.storage.DB().Create(&v2.ProviderAts{
			ProviderArticleID: article.ID,
			Ats:               article.Ats,
		})
	}
	tracer.lastAts, tracer.lastTraceTime = article.Ats, time.Now()
	return article.Ats <= 0
}