package main

import (
	"context"
	gm "db_service/gorm_models"
	cb "db_service/models"
	helper "db_service/pkg"
	"fmt"
	"log"
	"os"
	"sync"
	"time"

	"gorm.io/gorm"
)

var mainCategories []gm.Category
var baza *gorm.DB
var resultingChannel = make(chan gm.Category)
var producer_wg sync.WaitGroup
var consumer_wg sync.WaitGroup

func insertToBaza(product cb.Product) bool {

	return true
}

func tayyarla() {

	// baza, err := gorm.Open("mysql", os.Getenv("database_url"))

	// if err != nil {
	// 	panic(err)
	// }

	// mainCategories = gm.GetMainCategories(baza)

}

func bashlat() error {

	fmt.Println("Insert service starts")
	start := time.Now()
	tayyarla()

	fmt.Println("consuming")
	for c := 0; c < len(mainCategories); c++ {
		producer_wg.Add(1)
		go func() {
			defer consumer_wg.Done()

			// WaitGroup for iterate functions
			const max = 20
			var wg sync.WaitGroup

			responses := make(chan bool, max)

			for item := range resultingChannel {

				wg.Add(1)

				db := "ty_db_" + item.Translations[0].Slug

				dbExists := helper.CheckDBExists(os.Getenv("couchdb_url") + db)

				if dbExists {
					go iterateCategories(db, responses, func() { wg.Done() })
				}
			}

			// close iterate function responses
			go func() {
				defer close(responses)
				wg.Wait()
			}()

			for response := range responses {
				fmt.Println("response", response)
			}
		}()
	}

	fmt.Println("producing")
	for _, cat := range mainCategories {
		consumer_wg.Add(1)
		go func(category gm.Category) {
			defer producer_wg.Done()
			resultingChannel <- category
		}(cat)
	}
	producer_wg.Wait()

	close(resultingChannel)

	consumer_wg.Wait()

	elapsed := time.Since(start)

	log.Println("DB Time Elapsed:", elapsed)

	return nil

}

// func consumer() {
// 	fmt.Println("consuming")
// 	for c := 0; c < len(mainCategories); c++ {
// 		producer_wg.Add(1)
// 		go func() {
// 			defer consumer_wg.Done()

// 			// WaitGroup for iterate functions
// 			const max = 20
// 			var wg sync.WaitGroup

// 			responses := make(chan bool, max)

// 			for item := range resultingChannel {

// 				wg.Add(1)

// 				db := "ty_db_" + item.Translations[0].Slug

// 				dbExists := helper.CheckDBExists(os.Getenv("couchdb_url") + db)

// 				if dbExists {
// 					go iterateCategories(db, responses, func() { wg.Done() })
// 				}
// 			}

// 			// close iterate function responses
// 			go func() {
// 				defer close(responses)
// 				wg.Wait()
// 			}()

// 			for response := range responses {
// 				fmt.Println("response", response)
// 			}
// 		}()
// 	}
// }

// func producer() {
// 	fmt.Println("producing")
// 	for _, cat := range mainCategories {
// 		consumer_wg.Add(1)
// 		go func(category gm.Category) {
// 			defer producer_wg.Done()
// 			resultingChannel <- category
// 		}(cat)
// 	}
// 	producer_wg.Wait()

// 	close(resultingChannel)

// 	consumer_wg.Wait()
// }

// iterate categories
func iterateCategories(db string, finished chan<- bool, onExit func()) {

	_, cancel := context.WithCancel(context.Background())
	defer cancel()

	defer onExit()

	// start := time.Now()

	// get total product count from couch database
	totalDocCount := getTotalDocumentCount(db)

	if totalDocCount == 0 {
		cancel()
		return
	}

	// total document counter
	i := 0

	for i < totalDocCount {

		cdbTime := time.Now()
		product, err := getDataFromCouchDb(i, db)
		i++
		if err != nil {
			fmt.Println(err)
			cancel()
			return
		}

		//TODO: insert product to mysql
		fmt.Println("product: ", product.Name, " db: ", db)

		log.Println("Couch DB. Time elapsed:", time.Since(cdbTime), " DB: ", db)

		// gorm.AutoMigrate(&product)

		// // if there is an error inserting, handle it
		// if err != nil {
		// 	gorm.Close()
		// 	panic(err.Error())
		// }
		// be careful deferring Queries if you are using transactions
		// gorm.Close()

	}

	finished <- true
}