package admin

import (
	"encoding/json"
	"errors"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"testing"

	"oneblog/internal/model"
	"oneblog/internal/storage"
	"oneblog/internal/store"
)

func itoa(n int64) string { return strconv.FormatInt(n, 10) }

// seed 放一个本地 blob + 一行 files，再按 body 建一篇引用它的短文（body 为空表示不引用）。
func seed(t *testing.T, a *API, key, body string) model.File {
	t.Helper()
	if err := a.Blobs.Put(t.Context(), key, strings.NewReader("pngbytes"), 8, "image/png"); err != nil {
		t.Fatal(err)
	}
	f, err := a.Store.CreateFile(model.File{
		Key: key, Name: filepath.Base(key), Mime: "image/png",
		Size: 8, SHA256: strings.Repeat("f", 64), Store: "local",
	})
	if err != nil {
		t.Fatal(err)
	}
	if body != "" {
		if _, err := a.Store.Create(model.PostInput{
			Kind: model.KindShort, Slug: "s-" + key, ContentMd: body, Status: model.StatusPublished,
		}); err != nil {
			t.Fatal(err)
		}
	}
	return f
}

func TestFileRefsEndpoint(t *testing.T) {
	a, _ := newTestAPI(t)
	a.Blobs = storage.NewLocal(t.TempDir())
	f := seed(t, a, "2026/09/aaa.png", `看图 ![](/uploads/2026/09/aaa.png)`)
	// 顺手把站主头像也指到同一张图，refs 要把这一路也报出来
	if err := a.Store.SetSetting("owner_avatar_key", f.Key); err != nil {
		t.Fatal(err)
	}

	rec := doAs(t, a, http.MethodGet, "/api/admin/files/"+itoa(f.ID)+"/refs", "")
	if rec.Code != http.StatusOK {
		t.Fatalf("got %d %s", rec.Code, rec.Body.String())
	}
	var v struct {
		Key   string          `json:"key"`
		Count int             `json:"count"`
		Items []model.FileRef `json:"items"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &v); err != nil {
		t.Fatal(err)
	}
	if v.Key != f.Key || v.Count != 2 || len(v.Items) != 2 {
		t.Fatalf("refs 不对: %+v", v)
	}
	var kinds = map[string]bool{}
	for _, x := range v.Items {
		kinds[x.Kind] = true
	}
	if !kinds["post"] || !kinds["avatar"] {
		t.Fatalf("缺引用类型: %+v", v.Items)
	}

	// 不存在的文件：404 而不是空列表
	rec = doAs(t, a, http.MethodGet, "/api/admin/files/9999/refs", "")
	if rec.Code != http.StatusNotFound {
		t.Fatalf("want 404, got %d", rec.Code)
	}
	// 乱七八糟的子路径不收
	rec = doAs(t, a, http.MethodGet, "/api/admin/files/1/nope", "")
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("want 400, got %d", rec.Code)
	}
}

// 有引用时默认挡住，而且挡住之后 blob 和行都得还在（可重试）。
func TestFileDeleteBlockedByRefs(t *testing.T) {
	a, _ := newTestAPI(t)
	dir := t.TempDir()
	a.Blobs = storage.NewLocal(dir)
	f := seed(t, a, "2026/09/bbb.png", `![](/uploads/2026/09/bbb.png)`)

	rec := doAs(t, a, http.MethodDelete, "/api/admin/files/"+itoa(f.ID), "")
	if rec.Code != http.StatusConflict {
		t.Fatalf("want 409, got %d %s", rec.Code, rec.Body.String())
	}
	var e struct {
		Error string `json:"error"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &e); err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(e.Error, "1 处引用") {
		t.Fatalf("错误消息没报引用数: %q", e.Error)
	}
	if _, err := os.Stat(filepath.Join(dir, "2026/09/bbb.png")); err != nil {
		t.Fatalf("被挡住时不该动存储: %v", err)
	}
	if _, err := a.Store.GetFile(f.ID); err != nil {
		t.Fatalf("被挡住时不该删行: %v", err)
	}
}

// 明确带 force=1 才真删：行、blob 一起走。
func TestFileDeleteForceProceeds(t *testing.T) {
	a, _ := newTestAPI(t)
	dir := t.TempDir()
	a.Blobs = storage.NewLocal(dir)
	f := seed(t, a, "2026/09/ccc.png", `![](/uploads/2026/09/ccc.png)`)

	rec := doAs(t, a, http.MethodDelete, "/api/admin/files/"+itoa(f.ID)+"?force=1", "")
	if rec.Code != http.StatusOK {
		t.Fatalf("want 200, got %d %s", rec.Code, rec.Body.String())
	}
	if _, err := a.Store.GetFile(f.ID); !errors.Is(err, store.ErrNotFound) {
		t.Fatalf("行应已删除, got %v", err)
	}
	if _, err := os.Stat(filepath.Join(dir, "2026/09/ccc.png")); !os.IsNotExist(err) {
		t.Fatalf("blob 应已删除, got %v", err)
	}
}

// 没被引用的文件不用 force 也能删（守卫不能把所有删除都挡死）。
func TestFileDeleteUnreferenced(t *testing.T) {
	a, _ := newTestAPI(t)
	a.Blobs = storage.NewLocal(t.TempDir())
	f := seed(t, a, "2026/09/ddd.png", "")

	rec := doAs(t, a, http.MethodDelete, "/api/admin/files/"+itoa(f.ID), "")
	if rec.Code != http.StatusOK {
		t.Fatalf("want 200, got %d %s", rec.Code, rec.Body.String())
	}
	if _, err := a.Store.GetFile(f.ID); !errors.Is(err, store.ErrNotFound) {
		t.Fatalf("行应已删除, got %v", err)
	}
}