package handlers_test

import (
	"archive/zip"
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"booklib/internal/scanner"
	"booklib/internal/store"
)

func newLibrary(t *testing.T, st *store.Store, h http.Handler, tok, booksDir, name string) (store.Library, string) {
	t.Helper()
	root := filepath.Join(booksDir, name)
	os.MkdirAll(filepath.Join(root, "series-a"), 0o755)
	w := do(h, "POST", "/api/libraries", tok, map[string]string{"name": name})
	if w.Code != 201 {
		t.Fatalf("create lib %d %s", w.Code, w.Body)
	}
	var v struct {
		ID int64 `json:"id"`
	}
	json.Unmarshal(w.Body.Bytes(), &v)
	lib, err := st.GetLibrary(context.Background(), v.ID)
	if err != nil {
		t.Fatal(err)
	}
	return lib, root
}

func writeCBZ(t *testing.T, path string, pages int) {
	t.Helper()
	os.MkdirAll(filepath.Dir(path), 0o755)
	buf := &bytes.Buffer{}
	zw := zip.NewWriter(buf)
	for i := 1; i <= pages; i++ {
		w, _ := zw.Create(i2name(i))
		w.Write(bytes.Repeat([]byte("IMG"), 64))
	}
	zw.Close()
	os.WriteFile(path, buf.Bytes(), 0o644)
}
func i2name(i int) string { return fmt.Sprintf("%02d.jpg", i) }

func scanNow(t *testing.T, sc *scanner.Scanner, lib store.Library) {
	t.Helper()
	sc.ScanLibrary(context.Background(), lib)
}

func TestBookListDetailDelete(t *testing.T) {
	st, sc, h, booksDir := setupAPI(t)
	atok := adminToken(t, h)

	// member token + 进度前置数据
	do(h, "POST", "/api/users", atok, map[string]string{"username": "m2", "password": testPW, "role": "member"})
	mtok := loginAs(t, h, "m2", testPW)

	lib, root := newLibrary(t, st, h, atok, booksDir, "comics")
	writeCBZ(t, filepath.Join(root, "series-a", "vol_01.cbz"), 4)
	os.WriteFile(filepath.Join(root, "readme.txt"), []byte("hello world"), 0o644)
	scanNow(t, sc, lib)

	w := do(h, "GET", "/api/books", mtok, nil)
	var books []map[string]any
	json.Unmarshal(w.Body.Bytes(), &books)
	if w.Code != 200 || len(books) != 2 {
		t.Fatalf("list %d %s", w.Code, w.Body)
	}
	var cbz map[string]any
	for _, b := range books {
		if b["format"] == "cbz" {
			cbz = b
		}
	}
	if cbz == nil {
		t.Fatal("cbz missing")
	}
	if cbz["pages"].(float64) != 4 || cbz["library"] != "comics" || cbz["percent"].(float64) != 0 {
		t.Fatalf("bad json %+v", cbz)
	}
	if !strings.HasPrefix(cbz["cover_url"].(string), "/api/books/") || !strings.Contains(cbz["cover_url"].(string), "?v=") {
		t.Fatalf("cover_url %+v", cbz["cover_url"])
	}
	if cbz["page_url_fmt"] == nil {
		t.Fatalf("cbz must have page_url_fmt: %+v", cbz)
	}
	id := itoa(cbz["id"])

	// detail
	w = do(h, "GET", "/api/books/"+id, mtok, nil)
	if w.Code != 200 {
		t.Fatalf("detail %d", w.Code)
	}
	// 进度联动的断言在 Task 12(progress 端点此任务还不存在)

	// member 不能删
	w = do(h, "DELETE", "/api/books/"+id, mtok, nil)
	if w.Code != 403 {
		t.Fatalf("member delete want 403 got %d", w.Code)
	}
	// admin 删:行、文件、缓存目录都没;txt 文件保留
	w = do(h, "DELETE", "/api/books/"+id, atok, nil)
	if w.Code != 204 {
		t.Fatalf("admin delete %d %s", w.Code, w.Body)
	}
	if _, err := os.Stat(filepath.Join(root, "series-a", "vol_01.cbz")); !os.IsNotExist(err) {
		t.Fatal("file not removed")
	}
	w = do(h, "GET", "/api/books", atok, nil)
	json.Unmarshal(w.Body.Bytes(), &books)
	if len(books) != 1 || books[0]["format"] != "txt" {
		t.Fatalf("books after delete %+v", books)
	}
	// 过滤器
	w = do(h, "GET", "/api/books?library="+itoa(lib.ID)+"&q=readme&prefix=series/", atok, nil)
	json.Unmarshal(w.Body.Bytes(), &books)
	if len(books) != 0 {
		t.Fatalf("prefix+q filter broken %+v", books)
	}
	w = do(h, "GET", "/api/books?q=readme", atok, nil)
	json.Unmarshal(w.Body.Bytes(), &books)
	if len(books) != 1 {
		t.Fatalf("q broken %+v", books)
	}
}

func loginAs(t *testing.T, h http.Handler, user, pass string) string {
	t.Helper()
	w := do(h, "POST", "/api/auth/login", "", map[string]string{"username": user, "password": pass})
	if w.Code != 200 {
		t.Fatalf("login %s: %d", user, w.Code)
	}
	var v struct {
		Token string
	}
	json.Unmarshal(w.Body.Bytes(), &v)
	return v.Token
}

func TestDeleteUnsafePath403(t *testing.T) {
	st, _, h, booksDir := setupAPI(t)
	atok := adminToken(t, h)
	lib, _ := newLibrary(t, st, h, atok, booksDir, "libs")
	id, e := st.InsertBook(context.Background(), lib.ID, "../../x.cbz", "x", "cbz", 1, 1, 0)
	if e != nil {
		t.Fatal(e)
	}
	w := do(h, "DELETE", "/api/books/"+itoa(id), atok, nil)
	if w.Code != 403 {
		t.Fatalf("unsafe delete want 403 got %d %s", w.Code, w.Body)
	}
	if _, e := st.GetBook(context.Background(), id); e != nil { // 403 提前返回,行必须保留
		t.Fatalf("row must survive: %v", e)
	}
}