package dept

import (
	"context"
	"testing"

	"perms-system-server/internal/svc"
	"perms-system-server/internal/testutil"
	"perms-system-server/internal/types"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// TC-0098: 正常获取
func TestDeptTree_Normal(t *testing.T) {
	ctx := context.Background()
	svcCtx := svc.NewServiceContext(testutil.GetTestConfig())
	conn := testutil.GetTestSqlConn()

	rootId, err := insertDeptRaw(ctx, svcCtx, 0, "tree_root_"+testutil.UniqueId(), "/")
	require.NoError(t, err)
	root, _ := svcCtx.SysDeptModel.FindOne(ctx, rootId)

	c1Id, err := insertDeptRaw(ctx, svcCtx, rootId, "tree_c1_"+testutil.UniqueId(), root.Path)
	require.NoError(t, err)
	c2Id, err := insertDeptRaw(ctx, svcCtx, rootId, "tree_c2_"+testutil.UniqueId(), root.Path)
	require.NoError(t, err)

	t.Cleanup(func() { testutil.CleanTable(ctx, conn, "`sys_dept`", c1Id, c2Id, rootId) })

	treeLogic := NewDeptTreeLogic(ctx, svcCtx)
	tree, err := treeLogic.DeptTree()
	require.NoError(t, err)
	require.NotNil(t, tree)

	var rootNode *types.DeptItem
	for _, node := range tree {
		if node.Id == rootId {
			rootNode = node
			break
		}
	}
	require.NotNil(t, rootNode, "should find the test root node in tree")
	assert.Equal(t, int64(0), rootNode.ParentId)
	assert.Equal(t, "NORMAL", rootNode.DeptType)
	require.Len(t, rootNode.Children, 2)

	childIds := []int64{rootNode.Children[0].Id, rootNode.Children[1].Id}
	assert.ElementsMatch(t, []int64{c1Id, c2Id}, childIds)
}

// TC-0099: 空数据
func TestDeptTree_Empty(t *testing.T) {
	ctx := context.Background()
	svcCtx := svc.NewServiceContext(testutil.GetTestConfig())

	treeLogic := NewDeptTreeLogic(ctx, svcCtx)
	tree, err := treeLogic.DeptTree()
	require.NoError(t, err)
	assert.NotNil(t, tree)
	// Known limitation: shared integration DB may hold rows from other tests or packages,
	// so we cannot assert len(tree)==0 here without isolating or truncating sys_dept.
}

// TC-0100: 孤儿节点
func TestDeptTree_OrphanBecomesRoot(t *testing.T) {
	ctx := context.Background()
	svcCtx := svc.NewServiceContext(testutil.GetTestConfig())
	conn := testutil.GetTestSqlConn()

	parentId, err := insertDeptRaw(ctx, svcCtx, 0, "orphan_p_"+testutil.UniqueId(), "/")
	require.NoError(t, err)
	parent, _ := svcCtx.SysDeptModel.FindOne(ctx, parentId)

	childId, err := insertDeptRaw(ctx, svcCtx, parentId, "orphan_c_"+testutil.UniqueId(), parent.Path)
	require.NoError(t, err)

	testutil.CleanTable(ctx, conn, "`sys_dept`", parentId)
	t.Cleanup(func() { testutil.CleanTable(ctx, conn, "`sys_dept`", childId) })

	treeLogic := NewDeptTreeLogic(ctx, svcCtx)
	tree, err := treeLogic.DeptTree()
	require.NoError(t, err)

	var orphanNode *types.DeptItem
	for _, node := range tree {
		if node.Id == childId {
			orphanNode = node
			break
		}
	}
	require.NotNil(t, orphanNode, "orphan node should appear as root")
	assert.Equal(t, parentId, orphanNode.ParentId)
}