package tests_test

import (
	"testing"

	"gorm.io/gorm"
	. "gorm.io/gorm/utils/tests"
)

func TestBelongsToAssociation(t *testing.T) {
	user := *GetUser("belongs-to", Config{Company: true, Manager: true})

	if err := DB.Create(&user).Error; err != nil {
		t.Fatalf("errors happened when create: %v", err)
	}

	CheckUser(t, user, user)

	// Find
	var user2 User
	DB.Find(&user2, "id = ?", user.ID)
	pointerOfUser := &user2
	if err := DB.Model(&pointerOfUser).Association("Company").Find(&user2.Company); err != nil {
		t.Errorf("failed to query users, got error %#v", err)
	}
	user2.Manager = &User{}
	DB.Model(&user2).Association("Manager").Find(user2.Manager)
	CheckUser(t, user2, user)

	// Count
	AssertAssociationCount(t, user, "Company", 1, "")
	AssertAssociationCount(t, user, "Manager", 1, "")

	// Append
	company := Company{Name: "company-belongs-to-append"}
	manager := GetUser("manager-belongs-to-append", Config{})

	if err := DB.Model(&user2).Association("Company").Append(&company); err != nil {
		t.Fatalf("Error happened when append Company, got %v", err)
	}

	if company.ID == 0 {
		t.Fatalf("Company's ID should be created")
	}

	if err := DB.Model(&user2).Association("Manager").Append(manager); err != nil {
		t.Fatalf("Error happened when append Manager, got %v", err)
	}

	if manager.ID == 0 {
		t.Fatalf("Manager's ID should be created")
	}

	user.Company = company
	user.Manager = manager
	user.CompanyID = &company.ID
	user.ManagerID = &manager.ID
	CheckUser(t, user2, user)

	AssertAssociationCount(t, user2, "Company", 1, "AfterAppend")
	AssertAssociationCount(t, user2, "Manager", 1, "AfterAppend")

	// Replace
	company2 := Company{Name: "company-belongs-to-replace"}
	manager2 := GetUser("manager-belongs-to-replace", Config{})

	if err := DB.Model(&user2).Association("Company").Replace(&company2); err != nil {
		t.Fatalf("Error happened when replace Company, got %v", err)
	}

	if company2.ID == 0 {
		t.Fatalf("Company's ID should be created")
	}

	if err := DB.Model(&user2).Association("Manager").Replace(manager2); err != nil {
		t.Fatalf("Error happened when replace Manager, got %v", err)
	}

	if manager2.ID == 0 {
		t.Fatalf("Manager's ID should be created")
	}

	user.Company = company2
	user.Manager = manager2
	user.CompanyID = &company2.ID
	user.ManagerID = &manager2.ID
	CheckUser(t, user2, user)

	AssertAssociationCount(t, user2, "Company", 1, "AfterReplace")
	AssertAssociationCount(t, user2, "Manager", 1, "AfterReplace")

	// Delete
	if err := DB.Model(&user2).Association("Company").Delete(&Company{}); err != nil {
		t.Fatalf("Error happened when delete Company, got %v", err)
	}
	AssertAssociationCount(t, user2, "Company", 1, "after delete non-existing data")

	if err := DB.Model(&user2).Association("Company").Delete(&company2); err != nil {
		t.Fatalf("Error happened when delete Company, got %v", err)
	}
	AssertAssociationCount(t, user2, "Company", 0, "after delete")

	if err := DB.Model(&user2).Association("Manager").Delete(&User{}); err != nil {
		t.Fatalf("Error happened when delete Manager, got %v", err)
	}
	AssertAssociationCount(t, user2, "Manager", 1, "after delete non-existing data")

	if err := DB.Model(&user2).Association("Manager").Delete(manager2); err != nil {
		t.Fatalf("Error happened when delete Manager, got %v", err)
	}
	AssertAssociationCount(t, user2, "Manager", 0, "after delete")

	// Prepare Data for Clear
	if err := DB.Model(&user2).Association("Company").Append(&company); err != nil {
		t.Fatalf("Error happened when append Company, got %v", err)
	}

	if err := DB.Model(&user2).Association("Manager").Append(manager); err != nil {
		t.Fatalf("Error happened when append Manager, got %v", err)
	}

	AssertAssociationCount(t, user2, "Company", 1, "after prepare data")
	AssertAssociationCount(t, user2, "Manager", 1, "after prepare data")

	// Clear
	if err := DB.Model(&user2).Association("Company").Clear(); err != nil {
		t.Errorf("Error happened when clear Company, got %v", err)
	}

	if err := DB.Model(&user2).Association("Manager").Clear(); err != nil {
		t.Errorf("Error happened when clear Manager, got %v", err)
	}

	AssertAssociationCount(t, user2, "Company", 0, "after clear")
	AssertAssociationCount(t, user2, "Manager", 0, "after clear")

	// unexist company id
	unexistCompanyID := company.ID + 9999999
	user = User{Name: "invalid-user-with-invalid-belongs-to-foreign-key", CompanyID: &unexistCompanyID}
	if err := DB.Create(&user).Error; err == nil {
		t.Errorf("should have gotten foreign key violation error")
	}
}

func TestBelongsToAssociationForSlice(t *testing.T) {
	users := []User{
		*GetUser("slice-belongs-to-1", Config{Company: true, Manager: true}),
		*GetUser("slice-belongs-to-2", Config{Company: true, Manager: false}),
		*GetUser("slice-belongs-to-3", Config{Company: true, Manager: true}),
	}

	DB.Create(&users)

	AssertAssociationCount(t, users, "Company", 3, "")
	AssertAssociationCount(t, users, "Manager", 2, "")

	// Find
	var companies []Company
	if DB.Model(&users).Association("Company").Find(&companies); len(companies) != 3 {
		t.Errorf("companies count should be %v, but got %v", 3, len(companies))
	}

	var managers []User
	if DB.Model(&users).Association("Manager").Find(&managers); len(managers) != 2 {
		t.Errorf("managers count should be %v, but got %v", 2, len(managers))
	}

	// Append
	DB.Model(&users).Association("Company").Append(
		&Company{Name: "company-slice-append-1"},
		&Company{Name: "company-slice-append-2"},
		&Company{Name: "company-slice-append-3"},
	)

	AssertAssociationCount(t, users, "Company", 3, "After Append")

	DB.Model(&users).Association("Manager").Append(
		GetUser("manager-slice-belongs-to-1", Config{}),
		GetUser("manager-slice-belongs-to-2", Config{}),
		GetUser("manager-slice-belongs-to-3", Config{}),
	)
	AssertAssociationCount(t, users, "Manager", 3, "After Append")

	if err := DB.Model(&users).Association("Manager").Append(
		GetUser("manager-slice-belongs-to-test-1", Config{}),
	).Error; err == nil {
		t.Errorf("unmatched length when update user's manager")
	}

	// Replace -> same as append

	// Delete
	if err := DB.Model(&users).Association("Company").Delete(&users[0].Company); err != nil {
		t.Errorf("no error should happened when deleting company, but got %v", err)
	}

	if users[0].CompanyID != nil || users[0].Company.ID != 0 {
		t.Errorf("users[0]'s company should be deleted'")
	}

	AssertAssociationCount(t, users, "Company", 2, "After Delete")

	// Clear
	DB.Model(&users).Association("Company").Clear()
	AssertAssociationCount(t, users, "Company", 0, "After Clear")

	DB.Model(&users).Association("Manager").Clear()
	AssertAssociationCount(t, users, "Manager", 0, "After Clear")

	// shared company
	company := Company{Name: "shared"}
	if err := DB.Model(&users[0]).Association("Company").Append(&company); err != nil {
		t.Errorf("Error happened when append company to user, got %v", err)
	}

	if err := DB.Model(&users[1]).Association("Company").Append(&company); err != nil {
		t.Errorf("Error happened when append company to user, got %v", err)
	}

	if users[0].CompanyID == nil || users[1].CompanyID == nil || *users[0].CompanyID != *users[1].CompanyID {
		t.Errorf("user's company id should exists and equal, but its: %v, %v", users[0].CompanyID, users[1].CompanyID)
	}

	DB.Model(&users[0]).Association("Company").Delete(&company)
	AssertAssociationCount(t, users[0], "Company", 0, "After Delete")
	AssertAssociationCount(t, users[1], "Company", 1, "After other user Delete")
}

func TestBelongsToDefaultValue(t *testing.T) {
	type Org struct {
		ID string
	}
	type BelongsToUser struct {
		OrgID string
		Org   Org `gorm:"default:NULL"`
	}

	tx := DB.Session(&gorm.Session{})
	tx.Config.DisableForeignKeyConstraintWhenMigrating = true
	AssertEqual(t, DB.Config.DisableForeignKeyConstraintWhenMigrating, false)

	tx.Migrator().DropTable(&BelongsToUser{}, &Org{})
	tx.AutoMigrate(&BelongsToUser{}, &Org{})

	user := &BelongsToUser{
		Org: Org{
			ID: "BelongsToUser_Org_1",
		},
	}
	err := DB.Create(&user).Error
	AssertEqual(t, err, nil)
}