package usecase

import (
	"context"
	"git.sch9.ru/new_gate/ms-auth/config"
	"git.sch9.ru/new_gate/ms-auth/internal/models"
	mock_users "git.sch9.ru/new_gate/ms-auth/internal/users/usecase/mock"
	"git.sch9.ru/new_gate/ms-auth/pkg"
	"github.com/golang-jwt/jwt/v4"
	"github.com/google/uuid"
	"github.com/stretchr/testify/require"
	"go.uber.org/mock/gomock"
	"testing"
)

func TestUseCase_CreateUser(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	pgRepository := mock_users.NewMockPgRepository(ctrl)
	vkRepository := mock_users.NewMockValkeyRepository(ctrl)
	caller := mock_users.NewMockCaller(ctrl)

	uc := NewUseCase(
		pgRepository,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid create user (admin > moderator)", func(t *testing.T) {
		userId := int32(1)
		username := "username"
		password := "password"
		role := models.RoleModerator
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).Times(2)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleAdmin,
		}, nil)
		caller.EXPECT().CreateUser(ctx, username, password, role).Return(int32(2), nil)

		id, err := uc.CreateUser(ctx, username, password, role)
		require.NoError(t, err)
		require.Equal(t, int32(2), id)
	})

	t.Run("valid create user (moderator > participant)", func(t *testing.T) {
		userId := int32(1)
		username := "username"
		password := "password"
		role := models.RoleParticipant
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).Times(2)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleModerator,
		}, nil)
		caller.EXPECT().CreateUser(ctx, username, password, role).Return(int32(2), nil)

		id, err := uc.CreateUser(ctx, username, password, role)
		require.NoError(t, err)
		require.Equal(t, int32(2), id)
	})

	t.Run("valid create user (admin > participant)", func(t *testing.T) {
		userId := int32(1)
		username := "username"
		password := "password"
		role := models.RoleParticipant
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).Times(2)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleAdmin,
		}, nil)
		caller.EXPECT().CreateUser(ctx, username, password, role).Return(int32(2), nil)

		id, err := uc.CreateUser(ctx, username, password, role)
		require.NoError(t, err)
		require.Equal(t, int32(2), id)
	})

	t.Run("invalid user create 1 (no user id in context)", func(t *testing.T) {
		_, err := uc.CreateUser(context.Background(), "username", "password", models.RoleModerator)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.ErrUnauthenticated)
	})

	t.Run("invalid user create 2 (user not found)", func(t *testing.T) {
		userId := int32(1)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserById(ctx, userId).Return(nil, pkg.ErrNotFound)

		_, err := uc.CreateUser(ctx, "username", "password", models.RoleModerator)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.ErrNotFound)
	})

	t.Run("invalid user create 3 (no permission, participant < admin)", func(t *testing.T) {
		userId := int32(1)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleParticipant,
		}, nil)

		_, err := uc.CreateUser(ctx, "username", "password", models.RoleAdmin)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.NoPermission)
	})

	t.Run("invalid user create 4 (no permission, participant < moderator)", func(t *testing.T) {
		userId := int32(1)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleParticipant,
		}, nil)

		_, err := uc.CreateUser(ctx, "username", "password", models.RoleModerator)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.NoPermission)
	})

	t.Run("invalid user create 5 (no permission, moderator < admin)", func(t *testing.T) {
		userId := int32(1)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleModerator,
		}, nil)

		_, err := uc.CreateUser(ctx, "username", "password", models.RoleAdmin)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.NoPermission)
	})

	t.Run("invalid user create 6 (bad input, bad username)", func(t *testing.T) {
		userId := int32(1)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).Times(2)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleModerator,
		}, nil)
		caller.EXPECT().CreateUser(ctx,
			"test",
			"password",
			models.RoleParticipant,
		).Return(int32(0), pkg.ErrBadInput)

		_, err := uc.CreateUser(ctx, "test", "password", models.RoleParticipant)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.ErrBadInput)
	})
}

func TestUseCase_ReadUserById(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	pgRepository := mock_users.NewMockPgRepository(ctrl)
	vkRepository := mock_users.NewMockValkeyRepository(ctrl)
	caller := mock_users.NewMockCaller(ctrl)

	uc := NewUseCase(
		pgRepository,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid user read", func(t *testing.T) {
		userId := int32(1)
		ctx := context.Background()

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{Id: userId}, nil)

		user, err := uc.ReadUserById(ctx, userId)
		require.NoError(t, err)
		require.Equal(t, userId, user.Id)
	})

	t.Run("invalid user read 1 (not found)", func(t *testing.T) {
		userId := int32(0)
		ctx := context.Background()

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserById(ctx, userId).Return(nil, pkg.ErrNotFound)

		_, err := uc.ReadUserById(ctx, userId)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.ErrNotFound)
	})
}

func TestUseCase_ReadUserByUsername(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	pgRepository := mock_users.NewMockPgRepository(ctrl)
	vkRepository := mock_users.NewMockValkeyRepository(ctrl)
	caller := mock_users.NewMockCaller(ctrl)

	uc := NewUseCase(
		pgRepository,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid user read", func(t *testing.T) {
		username := "username"
		ctx := context.Background()

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserByUsername(ctx, username).Return(&models.User{Username: username}, nil)

		user, err := uc.ReadUserByUsername(ctx, username)
		require.NoError(t, err)
		require.Equal(t, username, user.Username)
	})

	t.Run("invalid user read 1 (not found)", func(t *testing.T) {
		username := "username"
		ctx := context.Background()

		pgRepository.EXPECT().C().Return(caller)
		caller.EXPECT().ReadUserByUsername(ctx, username).Return(nil, pkg.ErrNotFound)

		_, err := uc.ReadUserByUsername(ctx, username)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.ErrNotFound)
	})
}

func TestUseCase_UpdateUser(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	pgRepository := mock_users.NewMockPgRepository(ctrl)
	vkRepository := mock_users.NewMockValkeyRepository(ctrl)
	caller := mock_users.NewMockCaller(ctrl)
	txCaller := mock_users.NewMockTxCaller(ctrl)

	uc := NewUseCase(
		pgRepository,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid user update", func(t *testing.T) {
		userId := int32(1)
		userId2 := int32(2)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).AnyTimes()
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleAdmin,
		}, nil)
		caller.EXPECT().ReadUserById(ctx, userId2).Return(&models.User{
			Id:   userId2,
			Role: models.RoleModerator,
		}, nil)

		pgRepository.EXPECT().BeginTx(ctx).Return(txCaller, nil)
		txCaller.EXPECT().UpdateUser(ctx,
			userId2,
			StringP("newusername"),
			RoleP(models.RoleParticipant),
		).Return(nil)
		vkRepository.EXPECT().DeleteAllSessions(ctx, userId2).Return(nil)
		txCaller.EXPECT().Commit().Return(nil)

		err := uc.UpdateUser(ctx, userId2, StringP("newusername"), RoleP(models.RoleParticipant))
		require.NoError(t, err)
	})

	t.Run("invalid user update 1 (no user id in context)", func(t *testing.T) {
		pgRepository.EXPECT().C().Return(caller).AnyTimes()

		err := uc.UpdateUser(context.Background(), 0, StringP("newusername"), RoleP(models.RoleParticipant))
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.ErrUnauthenticated)
	})

	t.Run("invalid user update 2 (cant update role of myself)", func(t *testing.T) {
		userId := int32(1)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).AnyTimes()
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleAdmin,
		}, nil).Times(2)

		err := uc.UpdateUser(ctx, userId, StringP("newusername"), RoleP(models.RoleParticipant))
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.NoPermission)
	})

	t.Run("invalid user update 3 (cant set role >= my role)", func(t *testing.T) {
		userId := int32(1)
		userId2 := int32(2)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).AnyTimes()
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleModerator,
		}, nil)
		caller.EXPECT().ReadUserById(ctx, userId2).Return(&models.User{
			Id:   userId2,
			Role: models.RoleParticipant,
		}, nil)

		err := uc.UpdateUser(ctx, userId2, StringP("newusername"), RoleP(models.RoleModerator))
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.NoPermission)
	})

	t.Run("invalid user update 4 (cant edit user with >= role than mine)", func(t *testing.T) {
		userId := int32(1)
		userId2 := int32(2)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).AnyTimes()
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleModerator,
		}, nil)
		caller.EXPECT().ReadUserById(ctx, userId2).Return(&models.User{
			Id:   userId2,
			Role: models.RoleModerator,
		}, nil)

		err := uc.UpdateUser(ctx, userId2, StringP("newusername"), RoleP(models.RoleParticipant))
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.NoPermission)
	})
}

func TestUseCase_DeleteUser(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	pgRepository := mock_users.NewMockPgRepository(ctrl)
	vkRepository := mock_users.NewMockValkeyRepository(ctrl)
	caller := mock_users.NewMockCaller(ctrl)
	txCaller := mock_users.NewMockTxCaller(ctrl)

	uc := NewUseCase(
		pgRepository,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid user delete", func(t *testing.T) {
		userId := int32(1)
		userId2 := int32(2)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).AnyTimes()
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleAdmin,
		}, nil)
		pgRepository.EXPECT().BeginTx(ctx).Return(txCaller, nil)
		vkRepository.EXPECT().DeleteAllSessions(ctx, userId2).Return(nil)
		txCaller.EXPECT().DeleteUser(ctx, userId2).Return(nil)
		txCaller.EXPECT().Commit().Return(nil)

		err := uc.DeleteUser(ctx, userId2)
		require.NoError(t, err)
	})

	t.Run("invalid delete (cant delete myself)", func(t *testing.T) {
		userId := int32(1)
		ctx := context.WithValue(context.Background(), "userId", userId)

		pgRepository.EXPECT().C().Return(caller).AnyTimes()
		caller.EXPECT().ReadUserById(ctx, userId).Return(&models.User{
			Id:   userId,
			Role: models.RoleAdmin,
		}, nil)

		err := uc.DeleteUser(ctx, userId)
		require.Error(t, err)
		require.ErrorIs(t, err, pkg.NoPermission)
	})
}

func TestUseCase_CreateSession(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	vkRepository := mock_users.NewMockValkeyRepository(ctrl)

	uc := NewUseCase(
		nil,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid session creation", func(t *testing.T) {
		ctx := context.Background()
		sid := uuid.NewString()
		vkRepository.EXPECT().CreateSession(ctx, int32(1), models.RoleAdmin).Return(sid, nil)

		sessionId, err := uc.CreateSession(ctx, int32(1), models.RoleAdmin)
		require.NoError(t, err)
		require.Equal(t, sessionId, sid)
	})
}

func TestUseCase_ReadSession(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	vkRepository := mock_users.NewMockValkeyRepository(ctrl)

	uc := NewUseCase(
		nil,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid session read", func(t *testing.T) {
		ctx := context.Background()
		sid := uuid.NewString()
		vkRepository.EXPECT().ReadSession(ctx, sid).Return(&models.Session{
			UserId: 1,
			Id:     sid,
			Role:   models.RoleAdmin,
		}, nil)

		session, err := uc.ReadSession(ctx, sid)
		require.NoError(t, err)
		require.Equal(t, session.Id, sid)
		require.Equal(t, session.UserId, int32(1))
		require.Equal(t, session.Role, models.RoleAdmin)
	})
}

func TestUseCase_UpdateSession(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	vkRepository := mock_users.NewMockValkeyRepository(ctrl)

	uc := NewUseCase(
		nil,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid session update", func(t *testing.T) {
		ctx := context.Background()
		sid := uuid.NewString()
		vkRepository.EXPECT().UpdateSession(ctx, sid).Return(nil)

		err := uc.UpdateSession(ctx, sid)
		require.NoError(t, err)
	})
}

func TestUseCase_DeleteSession(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	vkRepository := mock_users.NewMockValkeyRepository(ctrl)

	uc := NewUseCase(
		nil,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid session delete", func(t *testing.T) {
		ctx := context.Background()
		sid := uuid.NewString()
		vkRepository.EXPECT().DeleteSession(ctx, sid).Return(nil)

		err := uc.DeleteSession(ctx, sid)
		require.NoError(t, err)
	})
}

func TestUseCase_DeleteAllSessions(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	vkRepository := mock_users.NewMockValkeyRepository(ctrl)

	uc := NewUseCase(
		nil,
		vkRepository,
		config.Config{
			JWTSecret: "abc",
		},
	)

	t.Run("valid session delete", func(t *testing.T) {
		ctx := context.Background()
		userId := int32(1)
		vkRepository.EXPECT().DeleteAllSessions(ctx, userId).Return(nil)

		err := uc.DeleteAllSessions(ctx, userId)
		require.NoError(t, err)
	})
}

func TestUseCase_Verify(t *testing.T) {
	t.Parallel()

	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	vkRepository := mock_users.NewMockValkeyRepository(ctrl)
	cfg := config.Config{JWTSecret: "abc"}
	uc := NewUseCase(
		nil,
		vkRepository,
		cfg,
	)

	t.Run("valid verification", func(t *testing.T) {
		ctx := context.Background()
		rsess := &models.Session{
			Id:     uuid.NewString(),
			UserId: 1,
			Role:   models.RoleAdmin,
		}

		vkRepository.EXPECT().ReadSession(ctx, rsess.Id).Return(rsess, nil)

		session, err := uc.Verify(ctx, rsess.Id)
		require.NoError(t, err)

		token, err := jwt.ParseWithClaims(session, &Token{}, func(token *jwt.Token) (interface{}, error) {
			return []byte(cfg.JWTSecret), nil
		})

		claims, ok := token.Claims.(*Token)

		require.True(t, ok)
		require.NoError(t, err)
		require.Equal(t, claims.SessionId, rsess.Id)
		require.Equal(t, claims.UserId, rsess.UserId)
		require.Equal(t, claims.Role, rsess.Role)
	})
}

func StringP(s string) *string {
	return &s
}

func RoleP(r models.Role) *models.Role {
	return &r
}