// Copyright 2026 tamakyi. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package db

import (
	"context"
	"testing"

	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
)

// TestQuestionDeleteCascadesHardDelete 验证删除提问时，追问与上传图片也被**真删**，
// 而不是软删残留。
//
// 背景：questions.DeleteByID 对主表用 Unscoped 真删，但历史上一度只有主表真删、
// 追问/图片仍软删，导致提问正文删干净了、追问文本与图片元数据却带着 deleted_at
// 永久留在库里（这正是「真删以免个人数据删不干净」想消灭的问题，却在子表漏改）。
// 本测试用 Unscoped 计数兜底：软删的行在普通查询里不可见，只有 Unscoped 才能看到，
// 因此断言「删除后 Unscoped 计数 = 0」才能证明是真删。
func TestQuestionDeleteCascadesHardDelete(t *testing.T) {
	db, cleanup := newTestDB(t)
	ctx := context.Background()

	questions := NewQuestionsStore(db)
	followUps := NewFollowUpsStore(db)
	uploadImages := NewUploadImagesStore(db)

	t.Cleanup(func() {
		// 三张表都要清：follow_ups / upload_images（含链接表）在删除后应该已经空了，
		// 但其他子测试的 data 可能残留，用 cleanup 统一兜底。
		_ = cleanup("questions", "follow_ups", "upload_images", "upload_image_questions")
	})

	// 建一条提问
	q, err := questions.Create(ctx, CreateQuestionOptions{
		FromIP:      "114.5.1.4",
		UserID:      1,
		Content:     "需要被彻底删除的提问",
		AskerUserID: 1,
	})
	require.NoError(t, err)

	// 给它加一条追问
	created, err := followUps.CreateIfBelowLimit(ctx, CreateFollowUpOptions{
		QuestionID: q.ID,
		Content:    "追问内容，也应被真删",
	})
	require.NoError(t, err)
	require.True(t, created)

	// 给它加一张上传图片
	img, err := uploadImages.Create(ctx, CreateUploadImageOptions{
		Type:           UploadImageQuestionTypeAsk,
		QuestionID:     q.ID,
		UploaderUserID: 1,
		Name:           "secret.png",
		FileSize:       1024,
		Md5:            "deadbeef",
		Key:            "2026/10/29/secret.png",
	})
	require.NoError(t, err)
	require.NotZero(t, img.ID)

	// 删除提问
	require.NoError(t, questions.DeleteByID(ctx, q.ID))

	// 主表：真删
	require.Equal(t, int64(0), hardCount(t, db, &Question{}, "id = ?", q.ID))

	// 追问：真删（软删的话这里会是 1）
	require.Equal(t, int64(0), hardCount(t, db, &FollowUp{}, "question_id = ?", q.ID))

	// 上传图片主体：真删
	require.Equal(t, int64(0), hardCount(t, db, &UploadImage{}, "id = ?", img.ID))

	// 关联行：真删
	require.Equal(t, int64(0), hardCount(t, db, &UploadImageQuestion{}, "question_id = ?", q.ID))
}

// hardCount 用 Unscoped 统计满足条件的行数，能穿透软删除过滤，
// 用于断言「物理上也不存在」。
func hardCount(t *testing.T, db *gorm.DB, model interface{}, where string, args ...interface{}) int64 {
	t.Helper()
	var n int64
	err := db.WithContext(context.Background()).Unscoped().
		Model(model).
		Where(where, args...).
		Count(&n).Error
	require.NoError(t, err)
	return n
}