package dept

import (
	"context"
	"errors"
	"testing"

	deptModel "perms-system-server/internal/model/dept"
	"perms-system-server/internal/testutil/ctxhelper"
	"perms-system-server/internal/testutil/mocks"
	"perms-system-server/internal/types"

	"github.com/stretchr/testify/assert"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
	"go.uber.org/mock/gomock"
)

type fakeResult struct{ id int64 }

func (r fakeResult) LastInsertId() (int64, error) { return r.id, nil }
func (r fakeResult) RowsAffected() (int64, error) { return 1, nil }

// TC-0097: 事务回滚-Insert失败
func TestCreateDept_Mock_InsertWithTxFail(t *testing.T) {
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	dbErr := errors.New("db error")

	mockDept := mocks.NewMockSysDeptModel(ctrl)
	mockDept.EXPECT().TransactCtx(gomock.Any(), gomock.Any()).
		DoAndReturn(func(ctx context.Context, fn func(context.Context, sqlx.Session) error) error {
			return fn(ctx, nil)
		})
	mockDept.EXPECT().InsertWithTx(gomock.Any(), nil, gomock.Any()).
		Return(nil, dbErr)

	svcCtx := mocks.NewMockServiceContext(mocks.MockModels{
		Dept: mockDept,
	})

	logic := NewCreateDeptLogic(ctxhelper.SuperAdminCtx(), svcCtx)
	resp, err := logic.CreateDept(&types.CreateDeptReq{
		ParentId: 0,
		Name:     "TestDept",
	})

	assert.Error(t, err)
	assert.ErrorIs(t, err, dbErr)
	assert.Nil(t, resp)
}

// TC-0094: 不传DeptType默认NORMAL
func TestCreateDept_Mock_DefaultDeptType(t *testing.T) {
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	mockDept := mocks.NewMockSysDeptModel(ctrl)
	mockDept.EXPECT().TransactCtx(gomock.Any(), gomock.Any()).
		DoAndReturn(func(ctx context.Context, fn func(context.Context, sqlx.Session) error) error {
			return fn(ctx, nil)
		})
	mockDept.EXPECT().InsertWithTx(gomock.Any(), nil, gomock.Any()).
		DoAndReturn(func(ctx context.Context, s sqlx.Session, data *deptModel.SysDept) (interface{ LastInsertId() (int64, error); RowsAffected() (int64, error) }, error) {
			assert.Equal(t, "NORMAL", data.DeptType)
			return fakeResult{id: 99}, nil
		})
	// L-R17-5：Insert 后 CreateDept 以单条 `UPDATE sys_dept SET path=?,updateTime=?` 回写 path，
	// 相对老路径 `FindOneWithTx → UpdateWithTx` 砍掉一次 SELECT、缩短 X 锁；mock 契约必须同步。
	mockDept.EXPECT().UpdatePathWithTx(gomock.Any(), nil, int64(99), "/99/", gomock.Any()).Return(nil)

	svcCtx := mocks.NewMockServiceContext(mocks.MockModels{Dept: mockDept})

	logic := NewCreateDeptLogic(ctxhelper.SuperAdminCtx(), svcCtx)
	resp, err := logic.CreateDept(&types.CreateDeptReq{
		ParentId: 0,
		Name:     "TestDept",
	})
	assert.NoError(t, err)
	assert.NotNil(t, resp)
}

// TC-0095: 传DeptType=DEV
func TestCreateDept_Mock_DevDeptType(t *testing.T) {
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	mockDept := mocks.NewMockSysDeptModel(ctrl)
	mockDept.EXPECT().TransactCtx(gomock.Any(), gomock.Any()).
		DoAndReturn(func(ctx context.Context, fn func(context.Context, sqlx.Session) error) error {
			return fn(ctx, nil)
		})
	mockDept.EXPECT().InsertWithTx(gomock.Any(), nil, gomock.Any()).
		DoAndReturn(func(ctx context.Context, s sqlx.Session, data *deptModel.SysDept) (interface{ LastInsertId() (int64, error); RowsAffected() (int64, error) }, error) {
			assert.Equal(t, "DEV", data.DeptType)
			return fakeResult{id: 100}, nil
		})
	mockDept.EXPECT().UpdatePathWithTx(gomock.Any(), nil, int64(100), "/100/", gomock.Any()).Return(nil)

	svcCtx := mocks.NewMockServiceContext(mocks.MockModels{Dept: mockDept})

	logic := NewCreateDeptLogic(ctxhelper.SuperAdminCtx(), svcCtx)
	resp, err := logic.CreateDept(&types.CreateDeptReq{
		ParentId: 0,
		Name:     "TestDevDept",
		DeptType: "DEV",
	})
	assert.NoError(t, err)
	assert.NotNil(t, resp)
}

// TC-0098: 事务回滚—path 回写失败，整个 tx 必须回滚并把 dbErr 原样冒泡出去。
func TestCreateDept_Mock_UpdateWithTxFail(t *testing.T) {
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	dbErr := errors.New("db error")

	mockDept := mocks.NewMockSysDeptModel(ctrl)
	mockDept.EXPECT().TransactCtx(gomock.Any(), gomock.Any()).
		DoAndReturn(func(ctx context.Context, fn func(context.Context, sqlx.Session) error) error {
			return fn(ctx, nil)
		})
	mockDept.EXPECT().InsertWithTx(gomock.Any(), nil, gomock.Any()).
		Return(fakeResult{id: 99}, nil)
	// L-R17-5：path 回写压缩成 UpdatePathWithTx 单 UPDATE；mock 在此注入失败以验证 tx 回滚。
	mockDept.EXPECT().UpdatePathWithTx(gomock.Any(), nil, int64(99), "/99/", gomock.Any()).
		Return(dbErr)

	svcCtx := mocks.NewMockServiceContext(mocks.MockModels{
		Dept: mockDept,
	})

	logic := NewCreateDeptLogic(ctxhelper.SuperAdminCtx(), svcCtx)
	resp, err := logic.CreateDept(&types.CreateDeptReq{
		ParentId: 0,
		Name:     "TestDept",
	})

	assert.Error(t, err)
	assert.ErrorIs(t, err, dbErr)
	assert.Nil(t, resp)
}