package repository

import (
	"database/sql"
	"errors"
	"fmt"
	"strings"
	"testing"

	"github.com/go-sql-driver/mysql"
	_ "modernc.org/sqlite"

	"cmautobuy/admin/model"
)

type skuSpecConflictExecer struct {
	*sql.DB
	conflictKey string
	inserted    bool
}

func (q *skuSpecConflictExecer) Exec(query string, args ...any) (sql.Result, error) {
	if !q.inserted && strings.HasPrefix(strings.TrimSpace(query), "INSERT INTO shopee_skus") {
		q.inserted = true
		_, err := q.DB.Exec(`INSERT INTO shopee_skus(
			sku_id,goods_id,spec_raw,spec_key,color,size,advice,parse_ok,is_manual,
			source,field_sources,field_observed_at,source_observed_at,created_at,updated_at
		) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)`,
			"catalog:existing", "GOODS-1", "白色,M", "白色,M", "目录白", "M", "",
			1, 0, "xlsx-processed", `{"color":"xlsx-processed","size":"xlsx-processed","advice":"","sku_code":""}`,
			`{"color":"2026-08-21T00:00:00Z","size":"2026-08-21T00:00:00Z","advice":"","sku_code":""}`,
			"2026-08-21T00:00:00Z", "2026-08-21T00:00:00Z", "2026-08-21T00:00:00Z")
		if err != nil {
			return nil, err
		}
		return nil, &mysql.MySQLError{Number: 1062, Message: "Duplicate entry for key '" + q.conflictKey + "'"}
	}
	return q.DB.Exec(query, args...)
}

func (q *skuSpecConflictExecer) QueryRow(query string, args ...any) *sql.Row {
	return q.DB.QueryRow(strings.TrimSuffix(query, " FOR UPDATE"), args...)
}

func newSKUConflictTestDB(t *testing.T, conflictKey string) *skuSpecConflictExecer {
	t.Helper()
	db, err := sql.Open("sqlite", ":memory:")
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { db.Close() })
	if _, err := db.Exec(`CREATE TABLE shopee_skus (
		sku_id TEXT PRIMARY KEY, shopee_sku_id TEXT, goods_id TEXT NOT NULL,
		spec_raw TEXT NOT NULL, spec_key TEXT NOT NULL, color TEXT, size TEXT,
		advice TEXT, parse_ok INTEGER NOT NULL, sku_code TEXT, is_manual INTEGER NOT NULL,
		source TEXT, field_sources TEXT, field_observed_at TEXT, source_observed_at TEXT,
		created_at TEXT NOT NULL, updated_at TEXT NOT NULL,
		UNIQUE(goods_id, spec_key)
	)`); err != nil {
		t.Fatal(err)
	}
	return &skuSpecConflictExecer{DB: db, conflictKey: conflictKey}
}

func TestUpsertCatalogShopeeSKU_规格唯一键并发冲突后安全重读(t *testing.T) {
	q := newSKUConflictTestDB(t, "uq_shopee_skus_spec")
	outcome, err := UpsertCatalogShopeeSKU(q, CatalogShopeeSKUInput{
		RecordID: "syb:incoming", GoodsID: "GOODS-1", SpecRaw: "白色,M", SpecKey: "白色,M",
		Color: "顺运宝白", Size: "M", ParseOK: true, Source: "syb",
		ObservedAt: "2026-08-21T00:01:00Z", Now: "2026-08-21T00:01:00Z", UpdatePolicy: "fill_missing",
	})
	if err != nil || outcome != CatalogSKUSkipped {
		t.Fatalf("并发撞键后应重读并按既有规则跳过：outcome=%q err=%v", outcome, err)
	}
	var id, color, source string
	if err := q.QueryRow(`SELECT sku_id,color,source FROM shopee_skus WHERE goods_id='GOODS-1' AND spec_key='白色,M'`).Scan(&id, &color, &source); err != nil {
		t.Fatal(err)
	}
	if id != "catalog:existing" || color != "目录白" || source != "xlsx-processed" {
		t.Fatalf("竞争方目录数据不得被 SYB 覆盖：id=%q color=%q source=%q", id, color, source)
	}
}

func TestUpsertCatalogShopeeSKU_非规格唯一键冲突仍失败(t *testing.T) {
	q := newSKUConflictTestDB(t, "uq_shopee_skus_external")
	_, err := UpsertCatalogShopeeSKU(q, CatalogShopeeSKUInput{
		RecordID: "syb:incoming", GoodsID: "GOODS-1", SpecRaw: "白色,M", SpecKey: "白色,M",
		Color: "顺运宝白", Size: "M", ParseOK: true, Source: "syb",
		ObservedAt: "2026-08-21T00:01:00Z", Now: "2026-08-21T00:01:00Z", UpdatePolicy: "fill_missing",
	})
	var mysqlErr *mysql.MySQLError
	if !errors.As(err, &mysqlErr) || mysqlErr.Number != 1062 {
		t.Fatalf("非规格唯一键冲突必须原样失败：%v", err)
	}
}

func TestCatalogImportRun_登记查询重放和冲突(t *testing.T) {
	db, err := sql.Open("sqlite", ":memory:")
	if err != nil {
		t.Fatal(err)
	}
	defer db.Close()
	if _, err := db.Exec(`CREATE TABLE catalog_import_runs (
		source TEXT NOT NULL,batch_id TEXT NOT NULL,request_hash TEXT NOT NULL,status TEXT NOT NULL,
		request_count INTEGER NOT NULL,conflict_count INTEGER NOT NULL,observed_at TEXT,update_policy TEXT NOT NULL DEFAULT 'fill_missing',last_request_at TEXT NOT NULL,
		last_conflict_at TEXT,shopee_created INTEGER NOT NULL DEFAULT 0,shopee_updated INTEGER NOT NULL DEFAULT 0,shopee_fields_filled INTEGER NOT NULL DEFAULT 0,shopee_fields_same_source_updated INTEGER NOT NULL DEFAULT 0,shopee_fields_manual_skipped INTEGER NOT NULL DEFAULT 0,shopee_fields_stale_skipped INTEGER NOT NULL DEFAULT 0,
		sku_created INTEGER NOT NULL DEFAULT 0,sku_updated INTEGER NOT NULL DEFAULT 0,sku_filled INTEGER NOT NULL DEFAULT 0,sku_same_source_updated INTEGER NOT NULL DEFAULT 0,sku_skipped INTEGER NOT NULL DEFAULT 0,sku_manual_skipped INTEGER NOT NULL DEFAULT 0,sku_stale_skipped INTEGER NOT NULL DEFAULT 0,pdd_created INTEGER NOT NULL DEFAULT 0,
		pdd_updated INTEGER NOT NULL DEFAULT 0,association_created INTEGER NOT NULL DEFAULT 0,
		association_unchanged INTEGER NOT NULL DEFAULT 0,failure_count INTEGER NOT NULL DEFAULT 0,
		error_summary TEXT,response_body TEXT,created_at TEXT NOT NULL,finished_at TEXT,
		PRIMARY KEY(source,batch_id))`); err != nil {
		t.Fatal(err)
	}
	run := model.CatalogImportRun{Source: "script-a", BatchID: "batch-1", RequestHash: "abc",
		Status: model.CatalogImportProcessing, ObservedAt: "2026-08-11T00:00:00Z",
		LastRequestAt: "2026-08-11T00:01:00Z", CreatedAt: "2026-08-11T00:01:00Z"}
	if err := InsertCatalogImportRun(db, run); err != nil {
		t.Fatal(err)
	}
	if err := InsertCatalogImportRun(db, run); !errors.Is(err, ErrCatalogImportRunExists) {
		t.Fatalf("重复批次应由唯一键拦截：%v", err)
	}
	if err := RecordCatalogImportReplay(db, run.Source, run.BatchID, "2026-08-11T00:02:00Z"); err != nil {
		t.Fatal(err)
	}
	if err := RecordCatalogImportConflict(db, run.Source, run.BatchID, "2026-08-11T00:03:00Z"); err != nil {
		t.Fatal(err)
	}
	got, err := GetCatalogImportRun(db, run.Source, run.BatchID)
	if err != nil {
		t.Fatal(err)
	}
	if got.RequestCount != 3 || got.ConflictCount != 1 || got.LastConflictAt == "" {
		t.Fatalf("批次计数不正确：%+v", got)
	}
	other := run
	other.Source, other.BatchID = "script-b", "batch-2"
	if err := InsertCatalogImportRun(db, other); err != nil {
		t.Fatal(err)
	}
	list, total, err := ListCatalogImportRuns(db, "script-a", model.CatalogImportProcessing, 20, 0)
	if err != nil || total != 1 || len(list) != 1 || list[0].BatchID != "batch-1" {
		t.Fatalf("分页筛选错误：total=%d list=%+v err=%v", total, list, err)
	}
	sources, err := ListCatalogImportSources(db)
	if err != nil || len(sources) != 2 {
		t.Fatalf("来源列表错误：%v %v", sources, err)
	}
	for i := 3; i <= 1001; i++ {
		bulk := run
		bulk.Source = "script-b"
		bulk.BatchID = fmt.Sprintf("batch-%04d", i)
		if err := InsertCatalogImportRun(db, bulk); err != nil {
			t.Fatal(err)
		}
	}
	page, total, err := ListCatalogImportRuns(db, "script-b", "", 20, 20)
	if err != nil || total != 1000 || len(page) != 20 {
		t.Fatalf("1000 条数据库分页错误：total=%d rows=%d err=%v", total, len(page), err)
	}
}