package repository

import (
	"fmt"
	"regexp"
	"strings"
	"testing"

	"github.com/DATA-DOG/go-sqlmock"
	"github.com/wmms/wmms/internal/model"
	"github.com/wmms/wmms/pkg/database"
)

const importLockRuleQuery = `SELECT id, organization_id, category_id, prefix, sequence_length, next_sequence FROM code_rules WHERE organization_id = ? AND category_id = ? AND status = 'active' FOR UPDATE`

const insertMaterialBatchStmt = `INSERT INTO materials (organization_id, material_code, name, material_image, spec, manufacturer_model, category_id, base_unit_id, unit, status, version) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?), (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`

func newImportMock(t *testing.T) (sqlmock.Sqlmock, func()) {
	t.Helper()
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("open sql mock: %v", err)
	}
	previous := database.DB
	database.DB = db
	return mock, func() {
		database.DB = previous
		db.Close()
	}
}

func materialCategoryPtr(id int64) *int64 { return &id }

func TestMaterialRepoImportTxAllocatesCodesAndInsertsOneByOne(t *testing.T) {
	mock, cleanup := newImportMock(t)
	defer cleanup()

	mock.ExpectBegin()
	mock.ExpectQuery(regexp.QuoteMeta(importLockRuleQuery)).WithArgs(int64(1), int64(12)).
		WillReturnRows(sqlmock.NewRows([]string{"id", "organization_id", "category_id", "prefix", "sequence_length", "next_sequence"}).
			AddRow(5, 1, 12, "A01", 4, 201))
	// 已占用编码探测：A010201 已被手工录入占用，应跳到 A010202
	mock.ExpectQuery(regexp.QuoteMeta(`SELECT material_code FROM materials WHERE organization_id = ? AND material_code LIKE ?`)).
		WithArgs(int64(1), "A01%").
		WillReturnRows(sqlmock.NewRows([]string{"material_code"}).AddRow("A010201"))
	mock.ExpectExec(regexp.QuoteMeta(`UPDATE code_rules SET next_sequence = ? WHERE id = ?`)).
		WithArgs(int64(204), int64(5)).WillReturnResult(sqlmock.NewResult(0, 1))
	// 两行折叠成一条多值 INSERT
	mock.ExpectExec(regexp.QuoteMeta(insertMaterialBatchStmt)).
		WithArgs(
			int64(1), "A010202", "螺栓", nil, "", nil, int64(12), nil, "个", "active", 1,
			int64(1), "A010203", "螺母", nil, "", nil, int64(12), nil, "个", "active", 1,
		).
		WillReturnResult(sqlmock.NewResult(31, 2))
	mock.ExpectQuery(regexp.QuoteMeta(`SELECT id, material_code FROM materials WHERE organization_id = ? AND material_code IN (?,?)`)).
		WithArgs(int64(1), "A010202", "A010203").
		WillReturnRows(sqlmock.NewRows([]string{"id", "material_code"}).
			AddRow(31, "A010202").AddRow(32, "A010203"))

	tx, err := database.DB.Begin()
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	categoryID := int64(12)
	materials := []*model.Material{
		{OrganizationID: 1, Name: "螺栓", CategoryID: &categoryID, Unit: "个", Status: "active", Version: 1},
		{OrganizationID: 1, Name: "螺母", CategoryID: &categoryID, Unit: "个", Status: "active", Version: 1},
	}
	if err := NewMaterialRepo().ImportTx(tx, 1, materials); err != nil {
		t.Fatalf("import: %v", err)
	}
	if materials[0].MaterialCode != "A010202" || materials[0].ID != 31 {
		t.Fatalf("first = %+v", materials[0])
	}
	if materials[1].MaterialCode != "A010203" || materials[1].ID != 32 {
		t.Fatalf("second = %+v", materials[1])
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}

func TestMaterialRepoImportTxReportsMissingCodeRule(t *testing.T) {
	mock, cleanup := newImportMock(t)
	defer cleanup()

	mock.ExpectBegin()
	mock.ExpectQuery(regexp.QuoteMeta(importLockRuleQuery)).WithArgs(int64(1), int64(12)).
		WillReturnRows(sqlmock.NewRows([]string{"id", "organization_id", "category_id", "prefix", "sequence_length", "next_sequence"}))

	tx, err := database.DB.Begin()
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	materials := []*model.Material{
		{OrganizationID: 1, Name: "螺栓", CategoryID: materialCategoryPtr(12), Unit: "个", Status: "active", Version: 1},
	}
	err = NewMaterialRepo().ImportTx(tx, 1, materials)
	if err == nil || !strings.Contains(err.Error(), "编码规则") {
		t.Fatalf("err = %v, want 编码规则错误", err)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}

func TestMaterialRepoImportTxBatchesInsertsOverFiveHundredRows(t *testing.T) {
	// 501 行 → 两批插入（500 + 1）。插入语句与回查参数很长，这里用子串松匹配，
	// 只断言"分了两批"以及编码序号按批连续。
	mock, cleanup := newImportMock(t)
	defer cleanup()

	mock.ExpectBegin()
	mock.ExpectQuery(regexp.QuoteMeta(importLockRuleQuery)).WithArgs(int64(1), int64(12)).
		WillReturnRows(sqlmock.NewRows([]string{"id", "organization_id", "category_id", "prefix", "sequence_length", "next_sequence"}).
			AddRow(5, 1, 12, "A01", 4, 1))
	mock.ExpectQuery(`SELECT material_code FROM materials`).
		WillReturnRows(sqlmock.NewRows([]string{"material_code"}))
	mock.ExpectExec(`UPDATE code_rules SET next_sequence`).WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec(`INSERT INTO materials`).WillReturnResult(sqlmock.NewResult(1000, 500))
	mock.ExpectQuery(`SELECT id, material_code FROM materials`).WillReturnRows(idRowsFor(1, 500))
	mock.ExpectExec(`INSERT INTO materials`).WillReturnResult(sqlmock.NewResult(1500, 1))
	mock.ExpectQuery(`SELECT id, material_code FROM materials`).WillReturnRows(idRowsFor(501, 501))

	tx, err := database.DB.Begin()
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	categoryID := int64(12)
	materials := make([]*model.Material, 0, 501)
	for i := 0; i < 501; i++ {
		materials = append(materials, &model.Material{
			OrganizationID: 1, Name: "物料", CategoryID: &categoryID, Unit: "个", Status: "active", Version: 1,
		})
	}
	if err := NewMaterialRepo().ImportTx(tx, 1, materials); err != nil {
		t.Fatalf("import: %v", err)
	}
	if materials[0].MaterialCode != "A010001" || materials[500].MaterialCode != "A010501" {
		t.Fatalf("codes = %s ... %s", materials[0].MaterialCode, materials[500].MaterialCode)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}

// idRowsFor 造出回查语句的返回行：序号 [from, to] 对应的物料 ID 与编码。
func idRowsFor(from, to int) *sqlmock.Rows {
	rows := sqlmock.NewRows([]string{"id", "material_code"})
	for i := from; i <= to; i++ {
		rows.AddRow(int64(i), fmt.Sprintf("A01%04d", i))
	}
	return rows
}

func TestMaterialLogRepoCreateBatchTx(t *testing.T) {
	mock, cleanup := newImportMock(t)
	defer cleanup()

	mock.ExpectBegin()
	mock.ExpectExec(`INSERT INTO material_logs`).WillReturnResult(sqlmock.NewResult(1, 2))

	tx, err := database.DB.Begin()
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	logs := []*model.MaterialLog{
		{OperationType: "CREATE", MaterialID: 31, Operator: "tester", Description: "批量导入"},
		{OperationType: "CREATE", MaterialID: 32, Operator: "tester", Description: "批量导入"},
	}
	if err := NewMaterialLogRepo().CreateBatchTx(tx, logs); err != nil {
		t.Fatalf("create batch: %v", err)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}

func TestMaterialImportLogRepoCreate(t *testing.T) {
	mock, cleanup := newImportMock(t)
	defer cleanup()

	mock.ExpectExec(regexp.QuoteMeta(`INSERT INTO material_import_logs (organization_id, operator, file_name, total_rows, success_rows, failed_rows, status, failure_reason) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`)).
		WithArgs(int64(1), "tester", "物料.xlsx", 200, 0, 3, "failed", "共 3 行校验未通过").
		WillReturnResult(sqlmock.NewResult(9, 1))

	log := &model.MaterialImportLog{
		OrganizationID: 1, Operator: "tester", FileName: "物料.xlsx",
		TotalRows: 200, SuccessRows: 0, FailedRows: 3,
		Status: "failed", FailureReason: "共 3 行校验未通过",
	}
	if err := NewMaterialImportLogRepo().Create(log); err != nil {
		t.Fatalf("create: %v", err)
	}
	if log.ID != 9 {
		t.Fatalf("id = %d, want 9", log.ID)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}