// security_fixes_test.go — 安全审计修复项行为测试：
// L4 enableChunk 强制、M2 presign 大小/类型校验、L3 提码长度、M3 chunk_size 上限。
package api

import (
	"bytes"
	"context"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/gin-gonic/gin"

	"fileshare/internal/model"
	"fileshare/internal/settings"
)

// postJSON 以 JSON body 调用 POST 端点。
func postJSON(d *Deps, path string, body any) *httptest.ResponseRecorder {
	var reader *bytes.Reader
	if body == nil {
		reader = bytes.NewReader(nil)
	} else {
		raw, _ := json.Marshal(body)
		reader = bytes.NewReader(raw)
	}
	req := httptest.NewRequest(http.MethodPost, path, reader)
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = req
	c.Params = append(c.Params, gin.Param{Key: "uploadID", Value: req.URL.Path[len("/presign/upload/confirm/"):]})
	d.presignConfirm(c)
	return w
}

// sha256LegacyHash 构造旧版 sha256$salt$hash 格式（M1 迁移测试用）。
func sha256LegacyHash(password string) string {
	salt := make([]byte, 16)
	for i := range salt {
		salt[i] = byte(i)
	}
	saltHex := hex.EncodeToString(salt)
	sum := sha256.Sum256([]byte(saltHex + password))
	return "sha256$" + saltHex + "$" + hex.EncodeToString(sum[:])
}

// TestChunkToggleEnforced L4：enableChunk=0 时 /chunk 相关端点一律 403。
func TestChunkToggleEnforced(t *testing.T) {
	d := newPolicyTestDeps(t)
	// 默认 enableChunk=0
	w := chunkInitJSON(d, `{"file_name":"a.png","file_size":500,"chunk_size":1024,"file_hash":"h"}`)
	if code, _ := respBody(t, w); code != http.StatusForbidden {
		t.Fatalf("enableChunk=0 时 init 应 403: %d %s", code, w.Body.String())
	}
	// 开启后放行
	if w := patchConfig(d, map[string]any{"enableChunk": 1}); w.Code != 200 {
		t.Fatalf("patch enableChunk: %d", w.Code)
	}
	w = chunkInitJSON(d, `{"file_name":"a.png","file_size":500,"chunk_size":1024,"file_hash":"h"}`)
	if code, _ := respBody(t, w); code != 200 {
		t.Fatalf("enableChunk=1 时 init 应 200: %d %s", code, w.Body.String())
	}
}

// TestChunkSizeCap M3：chunk_size 超过 32MB 上限时 400。
func TestChunkSizeCap(t *testing.T) {
	d := newPolicyTestDeps(t)
	if w := patchConfig(d, map[string]any{"enableChunk": 1}); w.Code != 200 {
		t.Fatalf("patch enableChunk: %d", w.Code)
	}
	w := chunkInitJSON(d, `{"file_name":"a.bin","file_size":70000000000,"chunk_size":34000000,"file_hash":"h"}`)
	if code, _ := respBody(t, w); code != http.StatusBadRequest {
		t.Fatalf("chunk_size 超上限应 400: %d %s", code, w.Body.String())
	}
}

// TestPickupCodeMinLen L3：4 位自定义码拒绝、5 位通过。
func TestPickupCodeMinLen(t *testing.T) {
	if err := validatePickupCode("abcd"); err == nil {
		t.Fatal("4 位码应被拒绝")
	}
	if err := validatePickupCode("abcde"); err != nil {
		t.Fatalf("5 位码应通过: %v", err)
	}
}

// TestPresignConfirmRejectsOversizeObject M2：
// 直传会话 confirm 时，若对象实际大小超过策略上限，应删除对象并 403。
func TestPresignConfirmRejectsOversizeObject(t *testing.T) {
	d := newPolicyTestDeps(t)
	ctx := context.Background()

	// 声明 10 字节、策略上限 100 → 实际 PUT 500 字节对象
	if err := d.Mgr.UpdateKV(ctx, map[string]any{"max_file_size": 100}); err != nil {
		t.Fatalf("UpdateKV: %v", err)
	}
	if err := d.Mgr.Reload(ctx); err != nil {
		t.Fatalf("Reload: %v", err)
	}

	uploadID := "test-oversize-confirm"
	savePath := "share/data/presign_test.bin"
	if _, err := d.Store.SaveFile(ctx, bytes.NewReader(make([]byte, 500)), savePath); err != nil {
		t.Fatalf("SaveFile: %v", err)
	}
	sess := model.PresignUploadSession{
		UploadID: uploadID, FileName: "presign_test.bin", FileSize: 10,
		SavePath: savePath, Mode: "direct",
		ExpireValue: 1, ExpireStyle: "day",
		CreatedAt: time.Now(), ExpiresAt: time.Now().Add(time.Hour), Engine: "local",
	}
	if err := d.DB.WithContext(ctx).Create(&sess).Error; err != nil {
		t.Fatalf("create session: %v", err)
	}
	res := model.StorageReservation{Token: "presign:" + uploadID, Size: 10, ExpiresAt: time.Now().Add(time.Hour)}
	if err := d.DB.WithContext(ctx).Create(&res).Error; err != nil {
		t.Fatalf("create reservation: %v", err)
	}

	w := postJSON(d, "/presign/upload/confirm/"+uploadID, nil)
	if w.Code != http.StatusForbidden {
		t.Fatalf("超限对象 confirm 应 403: %d %s", w.Code, w.Body.String())
	}
	// 对象应被删除、预留应释放
	if ok, _ := d.Store.FileExists(ctx, savePath); ok {
		t.Fatal("超限对象应被服务端删除")
	}
	var cnt int64
	_ = d.DB.WithContext(ctx).Model(&model.StorageReservation{}).Where("token = ?", res.Token).Count(&cnt).Error
	if cnt != 0 {
		t.Fatal("预留应被释放")
	}
}

// TestPresignConfirmRejectsSizeMismatch M2：实际大小与声明差超过 ±1KB 时 400。
func TestPresignConfirmRejectsSizeMismatch(t *testing.T) {
	d := newPolicyTestDeps(t)
	ctx := context.Background()

	uploadID := "test-mismatch-confirm"
	savePath := "share/data/presign_mismatch.bin"
	if _, err := d.Store.SaveFile(ctx, bytes.NewReader(make([]byte, 2048)), savePath); err != nil {
		t.Fatalf("SaveFile: %v", err)
	}
	sess := model.PresignUploadSession{
		UploadID: uploadID, FileName: "presign_mismatch.bin", FileSize: 10,
		SavePath: savePath, Mode: "proxy", // proxy 模式同样走大小核对（多引擎一致）
		ExpireValue: 1, ExpireStyle: "day",
		CreatedAt: time.Now(), ExpiresAt: time.Now().Add(time.Hour), Engine: "local",
	}
	if err := d.DB.WithContext(ctx).Create(&sess).Error; err != nil {
		t.Fatalf("create session: %v", err)
	}
	res := model.StorageReservation{Token: "presign:" + uploadID, Size: 10, ExpiresAt: time.Now().Add(time.Hour)}
	if err := d.DB.WithContext(ctx).Create(&res).Error; err != nil {
		t.Fatalf("create reservation: %v", err)
	}

	w := postJSON(d, "/presign/upload/confirm/"+uploadID, nil)
	if w.Code != http.StatusBadRequest {
		t.Fatalf("大小不符 confirm 应 400: %d %s", w.Code, w.Body.String())
	}
}

// TestAdminPasswordAutoUpgrade M1：明文/旧哈希经 VerifyPassword 后 NeedsRehash 为真，
// bcrypt 哈希不再需要升级。
func TestAdminPasswordAutoUpgrade(t *testing.T) {
	if !settings.NeedsRehash("FileCodeBox2023") {
		t.Fatal("明文哈希需要升级")
	}
	legacy := sha256LegacyHash("pwd12345")
	if !settings.NeedsRehash(legacy) {
		t.Fatal("sha256 哈希需要升级")
	}
	if !settings.VerifyPassword("pwd12345", legacy) {
		t.Fatal("旧 sha256 哈希兼容校验失败")
	}
	b := settings.HashPassword("pwd12345")
	if settings.NeedsRehash(b) {
		t.Fatal("bcrypt 哈希不需要升级")
	}
	if !settings.VerifyPassword("pwd12345", b) {
		t.Fatal("bcrypt 校验失败")
	}
	if settings.VerifyPassword("wrong", b) {
		t.Fatal("错误密码不应通过")
	}
}