package cost_component_group

import (
	"cargo-erp-backend/internal/domain"
	"cargo-erp-backend/pkg/helpers"
	"cargo-erp-backend/pkg/importer"
	"fmt"
	"strconv"
	"strings"
	"time"

	"github.com/oklog/ulid/v2"
	"gorm.io/gorm"
)

type CostComponentGroupImportHandler struct {
	UserData domain.User
	Helper   helpers.HelperInterface
}

func NewCostComponentGroupImportHandler(userData domain.User, helper helpers.HelperInterface) importer.ImportHandler {
	return &CostComponentGroupImportHandler{
		UserData: userData,
		Helper:   helper,
	}
}

func (h *CostComponentGroupImportHandler) ValidateRow(row []string, rowNumber int) (importer.RowData, []error) {
	var errors []error

	if len(row) < 4 {
		errors = append(errors, fmt.Errorf("row must have 4 columns: name, code, inc, value"))
		return nil, errors
	}

	name := strings.TrimSpace(row[0])
	if name == "" {
		errors = append(errors, fmt.Errorf("name is required"))
	} else if len(name) < 2 {
		errors = append(errors, fmt.Errorf("name must be at least 2 characters"))
	} else if len(name) > 255 {
		errors = append(errors, fmt.Errorf("name must be at most 255 characters"))
	}

	code := strings.TrimSpace(row[1])
	if code == "" {
		errors = append(errors, fmt.Errorf("code is required"))
	}

	incStr := strings.TrimSpace(row[2])
	var inc int32
	if incStr != "" {
		parsed, err := strconv.ParseInt(incStr, 10, 32)
		if err != nil {
			errors = append(errors, fmt.Errorf("inc must be a valid integer"))
		} else {
			inc = int32(parsed)
		}
	}

	value := strings.TrimSpace(row[3])

	if len(errors) > 0 {
		return nil, errors
	}

	now := time.Now()
	id := ulid.Make().String()
	group := &domain.CostComponentGroup{
		ID:         id,
		Name:       &name,
		Code:       &code,
		Inc:        &inc,
		Value:      &value,
		MerchantID: h.UserData.MerchantID,
		CreatedBy:  &h.UserData.ID,
		CreatedOn:  &now,
		UpdatedBy:  &h.UserData.ID,
		UpdatedOn:  &now,
	}

	return group, nil
}

func (h *CostComponentGroupImportHandler) GetDataString(data importer.RowData) string {
	group := data.(*domain.CostComponentGroup)
	name := ""
	if group.Name != nil {
		name = *group.Name
	}
	code := ""
	if group.Code != nil {
		code = *group.Code
	}
	return fmt.Sprintf("%s, %s", name, code)
}

func (h *CostComponentGroupImportHandler) IsDuplicate(db *gorm.DB, data importer.RowData) bool {
	group := data.(*domain.CostComponentGroup)
	var count int64
	db.Model(&domain.CostComponentGroup{}).
		Where("UPPER(name) = ? AND UPPER(code) = ?",
			strings.ToUpper(*group.Name), strings.ToUpper(*group.Code)).
		Count(&count)
	return count > 0
}

func (h *CostComponentGroupImportHandler) GetTemplateHeaders() []string {
	return []string{"name", "code", "inc", "value"}
}

func (h *CostComponentGroupImportHandler) GetTemplateRows() [][]string {
	return [][]string{
		{"Component A", "CA", "1", "10000"},
		{"Component B", "CB", "2", "20000"},
		{"Component C", "CC", "3", "30000"},
	}
}