// confirm-backfilled-pdd-availability 把三个固定 Excel 的完整 PDD 规格确认为可采购候选。
// 默认只预览；只有显式传入 -apply 才写数据库。
package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"log"
	"os"
	"time"

	"cmautobuy/admin/config"
	"cmautobuy/admin/repository"
	"cmautobuy/admin/service"
)

type backupFile struct {
	Shop        string       `json:"shop"`
	GeneratedAt string       `json:"generated_at"`
	Files       []string     `json:"files"`
	Items       []backupItem `json:"items"`
}

type backupItem struct {
	PDDGoodsID            string  `json:"pdd_goods_id"`
	OriginalSKUsJSON      string  `json:"original_skus_json"`
	OriginalCollectStatus string  `json:"original_collect_status"`
	OriginalCollectMsg    *string `json:"original_collect_msg"`
	OriginalArtifactRef   *string `json:"original_artifact_ref"`
	OriginalCollectedAt   *string `json:"original_collected_at"`
	OriginalUpdatedAt     string  `json:"original_updated_at"`
}

func main() {
	dir := flag.String("dir", "../raw_data", "三个固定 Excel 所在目录")
	apply := flag.Bool("apply", false, "实际写入；不传时只做 dry-run")
	flag.Parse()
	if flag.NArg() != 0 {
		log.Fatal("不接受额外文件参数；只会读取 -dir 下三个固定文件名")
	}

	sources, err := service.LoadXLSXPriceSources(*dir)
	if err != nil {
		log.Fatalf("读取三个固定 Excel 失败: %v", err)
	}
	cfg, err := config.LoadDatabase()
	if err != nil {
		log.Fatalf("读取 MySQL 配置失败: %v", err)
	}
	db, err := repository.OpenMySQL(cfg)
	if err != nil {
		log.Fatalf("连接 MySQL 失败: %v", err)
	}
	defer db.Close()
	targets, err := repository.ListShopPDDPriceBackfillTargets(db, service.XLSXPriceBackfillShop)
	if err != nil {
		log.Fatal(err)
	}
	plan := service.BuildXLSXAvailabilityPlan(sources, targets, time.Now())
	if !*apply {
		printReport(plan, 0, "dry-run")
		return
	}
	if len(plan.Candidates) == 0 {
		printReport(plan, 0, "applied-noop")
		return
	}
	backupPath, err := writeBackup(plan)
	if err != nil {
		log.Fatalf("创建本机回退备份失败，未写数据库: %v", err)
	}
	updated, err := service.ApplyXLSXAvailabilityPlan(db, plan, time.Now())
	if err != nil {
		log.Fatalf("PDD 可售状态确认失败: %v；本机备份位于 %s", err, backupPath)
	}
	printReport(plan, updated, "applied")
	fmt.Printf("本机回退备份：%s\n", backupPath)
}

func printReport(plan service.XLSXAvailabilityPlan, updated int, mode string) {
	summary, _ := json.Marshal(plan.Summary)
	skuCount := 0
	for _, candidate := range plan.Candidates {
		skuCount += candidate.SKUCount
	}
	fmt.Printf("模式：%s\n店铺：%s\nExcel 行：%d\n蝦皮商品：%d\nPDD 商品：%d\n候选 PDD：%d\n候选 SKU：%d\n本次更新 PDD：%d\n分类：%s\n",
		mode, plan.Shop, plan.Sources.RowCount, plan.Sources.ShopeeProductCount,
		plan.Sources.PDDProductCount, len(plan.Candidates), skuCount, updated, summary)
}

func writeBackup(plan service.XLSXAvailabilityPlan) (string, error) {
	file, err := os.CreateTemp("", "cmautobuy_xlsx_availability_backup_*.json")
	if err != nil {
		return "", err
	}
	path := file.Name()
	defer file.Close()
	if err := file.Chmod(0o600); err != nil {
		return "", err
	}
	backup := backupFile{
		Shop: plan.Shop, GeneratedAt: time.Now().UTC().Format(time.RFC3339),
		Files: append([]string(nil), service.XLSXPriceBackfillFiles...),
	}
	for _, candidate := range plan.Candidates {
		original := candidate.Original
		backup.Items = append(backup.Items, backupItem{
			PDDGoodsID: candidate.PDDGoodsID, OriginalSKUsJSON: original.SKUsJSON,
			OriginalCollectStatus: original.CollectStatus, OriginalCollectMsg: original.CollectMsg,
			OriginalArtifactRef: original.ArtifactRef, OriginalCollectedAt: original.CollectedAt,
			OriginalUpdatedAt: original.UpdatedAt,
		})
	}
	encoder := json.NewEncoder(file)
	encoder.SetIndent("", "  ")
	if err := encoder.Encode(backup); err != nil {
		return "", err
	}
	return path, nil
}