package validator

import (
	"testing"

	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/contract"

	"github.com/google/uuid"
	"github.com/stretchr/testify/require"
)

func validCreatePurchaseOrderRequest() *contract.CreatePurchaseOrderRequest {
	vendorID := uuid.New()
	ingredientID := uuid.New()
	quantity := 1.0
	unitID := uuid.New()

	return &contract.CreatePurchaseOrderRequest{
		VendorID:        &vendorID,
		PONumber:        "PO-001",
		TransactionDate: "2026-05-29",
		Items: []contract.CreatePurchaseOrderItemRequest{
			{
				IngredientID:       &ingredientID,
				PurchaseCategoryID: uuid.New(),
				Quantity:           &quantity,
				UnitID:             &unitID,
				Amount:             1000,
			},
		},
	}
}

func TestPurchaseOrderValidatorCreateAllowsMissingVendor(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	req.VendorID = nil

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.NoError(t, err)
	require.Empty(t, code)
}

func TestPurchaseOrderValidatorCreateRejectsEmptyVendor(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	vendorID := uuid.Nil
	req.VendorID = &vendorID

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
	require.Contains(t, err.Error(), "vendor_id cannot be empty")
}

func TestPurchaseOrderValidatorCreateAllowsMissingDueDate(t *testing.T) {
	validator := NewPurchaseOrderValidator()

	err, code := validator.ValidateCreatePurchaseOrderRequest(validCreatePurchaseOrderRequest())

	require.NoError(t, err)
	require.Empty(t, code)
}

func TestPurchaseOrderValidatorCreateRejectsInvalidDueDate(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	dueDate := "29-05-2026"
	req.DueDate = &dueDate

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
	require.Contains(t, err.Error(), "due_date must be in YYYY-MM-DD format")
}

func TestPurchaseOrderValidatorCreateRejectsDueDateBeforeTransactionDate(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	dueDate := "2026-05-28"
	req.DueDate = &dueDate

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
	require.Contains(t, err.Error(), "due_date must be after transaction_date")
}

func TestPurchaseOrderValidatorCreateAllowsCentralTeam(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	scope := constants.PurchaseTeamScopeCentral
	req.TeamScope = &scope

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.NoError(t, err)
	require.Empty(t, code)
}

func TestPurchaseOrderValidatorCreateRejectsCentralTeamWithCategory(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	scope := constants.PurchaseTeamScopeCentral
	categoryID := uuid.New()
	req.TeamScope = &scope
	req.TeamCategoryID = &categoryID

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
	require.Contains(t, err.Error(), "team_category_id must be empty")
}

func TestPurchaseOrderValidatorCreateRejectsCategoryTeamWithoutCategory(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	scope := constants.PurchaseTeamScopeCategory
	req.TeamScope = &scope

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MissingFieldErrorCode, code)
	require.Contains(t, err.Error(), "team_category_id is required")
}

func TestPurchaseOrderValidatorCreateRejectsCategoryWithoutScope(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	categoryID := uuid.New()
	req.TeamCategoryID = &categoryID

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MissingFieldErrorCode, code)
	require.Contains(t, err.Error(), "team_scope is required")
}

func TestPurchaseOrderValidatorCreateRejectsUnknownTeamScope(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	scope := "outlet"
	req.TeamScope = &scope

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
	require.Contains(t, err.Error(), "team_scope must be one of")
}

// An update may clear the team with an empty scope; a create may not, because
// leaving the field out already means "no team".
func TestPurchaseOrderValidatorUpdateAllowsClearingTeam(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	scope := ""

	err, code := validator.ValidateUpdatePurchaseOrderRequest(&contract.UpdatePurchaseOrderRequest{TeamScope: &scope})

	require.NoError(t, err)
	require.Empty(t, code)
}

func TestPurchaseOrderValidatorCreateRejectsEmptyTeamScope(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	req := validCreatePurchaseOrderRequest()
	scope := ""
	req.TeamScope = &scope

	err, code := validator.ValidateCreatePurchaseOrderRequest(req)

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
}

func TestPurchaseOrderValidatorUpdateRejectsClearingTeamWithCategory(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	scope := ""
	categoryID := uuid.New()

	err, code := validator.ValidateUpdatePurchaseOrderRequest(&contract.UpdatePurchaseOrderRequest{
		TeamScope:      &scope,
		TeamCategoryID: &categoryID,
	})

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
}

func TestPurchaseOrderValidatorListRejectsCentralScopeWithCategory(t *testing.T) {
	validator := NewPurchaseOrderValidator()
	categoryID := uuid.New()

	err, code := validator.ValidateListPurchaseOrdersRequest(&contract.ListPurchaseOrdersRequest{
		Page:           1,
		Limit:          10,
		TeamScope:      constants.PurchaseTeamScopeCentral,
		TeamCategoryID: &categoryID,
	})

	require.Error(t, err)
	require.Equal(t, constants.MalformedFieldErrorCode, code)
}