// Copyright 2026 Mihna123 Software
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package user

import (
	"errors"
	"log/slog"
	"os"
	"testing"

	"golang.org/x/crypto/bcrypt"
)

func TestMain(m *testing.M) {
	slog.SetDefault(slog.New(slog.DiscardHandler))
	os.Exit(m.Run())
}

func newTestUserService(t *testing.T) *Service {
	t.Helper()
	return &Service{repository: newEmptyRepository(), bcryptCost: bcrypt.MinCost}
}

func TestRegisterInputValidateFaultyData(t *testing.T) {
	badInputs := getInvalidRegisterInputs()

	for name, in := range badInputs {
		t.Run(name, func(t *testing.T) {
			err := in.validate()
			if err == nil {
				t.Errorf("bad input got through: %+v", in)
			}
			if !errors.Is(err, ErrInvalidInput) {
				t.Errorf("unexpected error: got %v, want ErrInvalidInput", err)
			}
		})
	}
}

func TestRegisterBadInput(t *testing.T) {
	in := &RegisterInput{}
	s := newTestUserService(t)
	_, err := s.Register(in)

	if err == nil {
		t.Error("no error when registering with faulty input")
	}

	if !errors.Is(err, ErrInvalidInput) {
		t.Errorf("unexpected error: got %v, want ErrInvalidInput", err)
	}
}

func TestRegisterExistingUser(t *testing.T) {
	badInputs := map[string]RegisterInput{
		"existing username": {
			Username: "johnsmith",
			Email:    "thisemaildoesnt@exist.com",
			Phone:    "123321",
			Password: "22332233",
		},
		"existing email": {
			Username: "thisusernamedoesntexist",
			Email:    "janedoe@email.com",
			Phone:    "123321",
			Password: "22332233",
		},
	}

	for name, in := range badInputs {
		t.Run(name, func(t *testing.T) {
			r := newEmptyRepository()
			r.fill()
			s := &Service{repository: r, bcryptCost: bcrypt.MinCost}

			_, err := s.Register(&in)
			if err == nil {
				t.Error("existing user registered")
			}

			if !errors.Is(err, ErrUserExists) {
				t.Errorf("unexpected error: got %v, want ErrUserExists", err)
			}
		})
	}
}

func TestRegisterRepositoryError(t *testing.T) {
	s := &Service{
		repository: &RepositoryMock{err: errors.New("db down")},
		bcryptCost: bcrypt.MinCost,
	}

	in := &RegisterInput{Username: "bob", Email: "b@b.com", Password: "thisissecure"}
	_, err := s.Register(in)

	if err == nil {
		t.Error("register swallowed repository error")
	}

	if errors.Is(err, ErrUserExists) {
		t.Error("repository failure reported as ErrUserExists")
	}
}

func TestSuccessfulRegister(t *testing.T) {
	s := newTestUserService(t)
	in := &RegisterInput{
		Username: "happyuser123",
		Email:    "happyuser@email.com",
		Phone:    "+381233232",
		Password: "supersecretpassword1234",
	}
	usr, err := s.Register(in)
	if err != nil {
		t.Fatalf("register with good input failed: %+v", in)
	}

	err = bcrypt.CompareHashAndPassword([]byte(usr.passwordHash), []byte(in.Password))
	if err != nil {
		t.Errorf("hash and password compare error: %v", err)
	}
}

func TestRegisterSameUserTwice(t *testing.T) {
	s := newTestUserService(t)
	in := &RegisterInput{
		Username: "happyuser123",
		Email:    "happyuser@email.com",
		Phone:    "+381233232",
		Password: "supersecretpassword1234",
	}

	if _, err := s.Register(in); err != nil {
		t.Fatalf("first register failed: %v", err)
	}

	_, err := s.Register(in)
	if err == nil {
		t.Errorf("registered same user twice: %+v", in)
	}

	if !errors.Is(err, ErrUserExists) {
		t.Errorf("unexpected error: got %v, want ErrUserExists", err)
	}

}