package services

import (
	"fmt"
	"testing"

	"git.mchus.pro/mchus/priceforge/internal/models"
	"github.com/glebarez/sqlite"
	"gorm.io/gorm"
)

func TestUpsertMappingWithOriginalVendor_DeletesEmptyOriginalVendorRow(t *testing.T) {
	db, err := gorm.Open(sqlite.Open(testSQLiteDSN(t)), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}

	stmts := []string{
		`CREATE TABLE lot (
			lot_name TEXT PRIMARY KEY,
			lot_description TEXT,
			lot_category TEXT
		)`,
		`CREATE TABLE qt_vendor_partnumber_seen (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			source_type TEXT NOT NULL,
			vendor TEXT NOT NULL DEFAULT '',
			partnumber TEXT NOT NULL UNIQUE,
			description TEXT NULL,
			last_seen_at DATETIME NOT NULL,
			is_ignored INTEGER NOT NULL DEFAULT 0,
			is_pattern INTEGER NOT NULL DEFAULT 0,
			ignored_at DATETIME NULL,
			ignored_by TEXT NULL,
			created_at DATETIME NULL,
			updated_at DATETIME NULL
		)`,
		`CREATE TABLE qt_partnumber_book_items (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			partnumber TEXT NOT NULL UNIQUE,
			lots_json TEXT NOT NULL,
			description TEXT NULL
		)`,
	}
	for _, stmt := range stmts {
		if err := db.Exec(stmt).Error; err != nil {
			t.Fatalf("exec schema: %v", err)
		}
	}

	if err := db.Create(&models.Lot{LotName: "MB_INTEL_6.6700/6500(GNR-SP,SRF-SP)_2S_32xDDR5"}).Error; err != nil {
		t.Fatalf("insert lot: %v", err)
	}
	if err := db.Create(&models.PartnumberBookItem{
		Partnumber: "7DG9-CTO1WW",
		LotsJSON:   `[{"lot_name":"MB_INTEL_6.6700/6500(GNR-SP,SRF-SP)_2S_32xDDR5","qty":1}]`,
	}).Error; err != nil {
		t.Fatalf("insert original mapping: %v", err)
	}

	svc := NewVendorMappingService(db)
	if err := svc.UpsertMappingWithOriginalVendor(
		"",
		"Lenovo",
		"7DG9-CTO1WW",
		"MB_INTEL_6.6700/6500(GNR-SP,SRF-SP)_2S_32xDDR5",
		"",
		nil,
	); err != nil {
		t.Fatalf("upsert mapping: %v", err)
	}

	var rows []models.PartnumberBookItem
	if err := db.Order("partnumber").Find(&rows).Error; err != nil {
		t.Fatalf("list mappings: %v", err)
	}
	if len(rows) != 1 {
		t.Fatalf("got %d mapping rows, want 1", len(rows))
	}
	if rows[0].Partnumber != "7DG9-CTO1WW" {
		t.Fatalf("got partnumber %q, want %q", rows[0].Partnumber, "7DG9-CTO1WW")
	}

	var seen models.VendorPartnumberSeen
	if err := db.Where("partnumber = ?", "7DG9-CTO1WW").First(&seen).Error; err != nil {
		t.Fatalf("load seen row: %v", err)
	}
	if seen.Vendor != "Lenovo" {
		t.Fatalf("got vendor %q, want %q", seen.Vendor, "Lenovo")
	}
}

func TestUpsertMappingWithOriginalVendor_PreservesDescriptionFromEmptyOriginalVendorRow(t *testing.T) {
	db, err := gorm.Open(sqlite.Open(testSQLiteDSN(t)), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}

	stmts := []string{
		`CREATE TABLE lot (
			lot_name TEXT PRIMARY KEY,
			lot_description TEXT,
			lot_category TEXT
		)`,
		`CREATE TABLE qt_vendor_partnumber_seen (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			source_type TEXT NOT NULL,
			vendor TEXT NOT NULL DEFAULT '',
			partnumber TEXT NOT NULL UNIQUE,
			description TEXT NULL,
			last_seen_at DATETIME NOT NULL,
			is_ignored INTEGER NOT NULL DEFAULT 0,
			is_pattern INTEGER NOT NULL DEFAULT 0,
			ignored_at DATETIME NULL,
			ignored_by TEXT NULL,
			created_at DATETIME NULL,
			updated_at DATETIME NULL
		)`,
		`CREATE TABLE qt_partnumber_book_items (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			partnumber TEXT NOT NULL UNIQUE,
			lots_json TEXT NOT NULL,
			description TEXT NULL
		)`,
	}
	for _, stmt := range stmts {
		if err := db.Exec(stmt).Error; err != nil {
			t.Fatalf("exec schema: %v", err)
		}
	}

	const lotName = "MB_INTEL_6.6700/6500(GNR-SP,SRF-SP)_2S_32xDDR5"
	const wantDescription = "Existing description"
	if err := db.Create(&models.Lot{LotName: lotName}).Error; err != nil {
		t.Fatalf("insert lot: %v", err)
	}
	if err := db.Create(&models.PartnumberBookItem{
		Partnumber:  "7DG9-CTO1WW",
		LotsJSON:    fmt.Sprintf(`[{"lot_name":%q,"qty":1}]`, lotName),
		Description: stringPtr(wantDescription),
	}).Error; err != nil {
		t.Fatalf("insert original mapping: %v", err)
	}

	svc := NewVendorMappingService(db)
	if err := svc.UpsertMappingWithOriginalVendor("", "Lenovo", "7DG9-CTO1WW", lotName, "", nil); err != nil {
		t.Fatalf("upsert mapping: %v", err)
	}

	var row models.PartnumberBookItem
	if err := db.Where("partnumber = ?", "7DG9-CTO1WW").First(&row).Error; err != nil {
		t.Fatalf("load new mapping: %v", err)
	}
	if row.Description == nil || *row.Description != wantDescription {
		got := "<nil>"
		if row.Description != nil {
			got = *row.Description
		}
		t.Fatalf("got description %q, want %q", got, wantDescription)
	}
}

func stringPtr(v string) *string {
	return &v
}

func testSQLiteDSN(t *testing.T) string {
	return fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())
}

func TestPurgeSeenLotNames_RemovesPollutedSeenRowsButKeepsMappedPartnumbers(t *testing.T) {
	db, err := gorm.Open(sqlite.Open(testSQLiteDSN(t)), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}

	stmts := []string{
		`CREATE TABLE lot (
			lot_name TEXT PRIMARY KEY,
			lot_description TEXT,
			lot_category TEXT
		)`,
		`CREATE TABLE qt_partnumber_book_items (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			partnumber TEXT NOT NULL UNIQUE,
			lots_json TEXT NOT NULL,
			description TEXT NULL
		)`,
		`CREATE TABLE qt_vendor_partnumber_seen (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			source_type TEXT NOT NULL,
			vendor TEXT NOT NULL DEFAULT '',
			partnumber TEXT NOT NULL UNIQUE,
			description TEXT NULL,
			last_seen_at DATETIME NOT NULL,
			is_ignored INTEGER NOT NULL DEFAULT 0,
			is_pattern INTEGER NOT NULL DEFAULT 0,
			ignored_at DATETIME NULL,
			ignored_by TEXT NULL,
			created_at DATETIME NULL,
			updated_at DATETIME NULL
		)`,
	}
	for _, stmt := range stmts {
		if err := db.Exec(stmt).Error; err != nil {
			t.Fatalf("exec schema: %v", err)
		}
	}

	now := "2026-03-07 00:00:00"
	if err := db.Exec(`INSERT INTO lot (lot_name) VALUES (?), (?)`, "LOT_NAME_1", "LOT_NAME_2").Error; err != nil {
		t.Fatalf("insert lots: %v", err)
	}
	if err := db.Exec(`INSERT INTO qt_partnumber_book_items (partnumber, lots_json) VALUES (?, ?)`, "LOT_NAME_2", `[{"lot_name":"LOT_NAME_2","qty":1}]`).Error; err != nil {
		t.Fatalf("insert mapped pn: %v", err)
	}
	if err := db.Exec(`INSERT INTO qt_vendor_partnumber_seen (source_type, vendor, partnumber, last_seen_at) VALUES (?, ?, ?, ?), (?, ?, ?, ?)`,
		"stock", "", "LOT_NAME_1", now,
		"stock", "", "LOT_NAME_2", now,
	).Error; err != nil {
		t.Fatalf("insert seen rows: %v", err)
	}

	if err := purgeSeenLotNames(db); err != nil {
		t.Fatalf("purge seen lot names: %v", err)
	}

	var rows []models.VendorPartnumberSeen
	if err := db.Order("partnumber").Find(&rows).Error; err != nil {
		t.Fatalf("load seen rows: %v", err)
	}
	if len(rows) != 1 {
		t.Fatalf("got %d seen rows, want 1", len(rows))
	}
	if rows[0].Partnumber != "LOT_NAME_2" {
		t.Fatalf("got partnumber %q, want %q", rows[0].Partnumber, "LOT_NAME_2")
	}
}